Use tablet characteristics

Shouldn't be necessary but google do weird things every day. Let's avoid a possible future bootloop

audio/hal/Android.bp

@@ -0,0 +1,139 @@
+cc_defaults {
+    name: "android.hardware.audio-impl-system_default",
+    relative_install_path: "hw",
+    srcs: [
+        "Device.cpp",
+        "DevicesFactory.cpp",
+        "ParametersUtil.cpp",
+        "PrimaryDevice.cpp",
+        "Stream.cpp",
+        "StreamIn.cpp",
+        "StreamOut.cpp",
+        "service.cpp",
+    ],
+    shared_libs: [
+        "libbase",
+        "libcutils",
+        "libfmq",
+        "libhardware",
+        "libhidlbase",
+        "liblog",
+        "libmedia_helper",
+        "libmediautils_vendor",
+        "libmemunreachable",
+        "libutils",
+        "android.hardware.audio.common-util",
+    ],
+    static_libs: [
+        "libaudiofoundation",
+    ],
+    header_libs: [
+        "android.hardware.audio.common.util@all-versions",
+        "libaudioutils_headers",
+        "libaudio_system_headers",
+        "libmedia_headers",
+        "libmediautils_headers",
+        "libhardware_headers",
+    ]
+}
+
+cc_library_shared {
+    name: "android.hardware.audio@2.0-impl-system",
+    defaults: ["android.hardware.audio-impl-system_default"],
+    shared_libs: [
+        "android.hardware.audio@2.0",
+        "android.hardware.audio@2.0-util",
+        "android.hardware.audio.common@2.0",
+        "android.hardware.audio.common@2.0-util",
+    ],
+    cflags: [
+        "-DMAJOR_VERSION=2",
+        "-DMINOR_VERSION=0",
+        "-include common/all-versions/VersionMacro.h",
+    ],
+}
+cc_library_shared {
+    name: "android.hardware.audio@4.0-impl-system",
+    defaults: ["android.hardware.audio-impl-system_default"],
+    shared_libs: [
+        "android.hardware.audio@4.0",
+        "android.hardware.audio@4.0-util",
+        "android.hardware.audio.common@4.0",
+        "android.hardware.audio.common@4.0-util",
+    ],
+    cflags: [
+        "-DMAJOR_VERSION=4",
+        "-DMINOR_VERSION=0",
+        "-include common/all-versions/VersionMacro.h",
+    ],
+}
+cc_library_shared {
+    name: "android.hardware.audio@5.0-impl-system",
+    defaults: ["android.hardware.audio-impl-system_default"],
+    shared_libs: [
+        "android.hardware.audio@5.0",
+        "android.hardware.audio@5.0-util",
+        "android.hardware.audio.common@5.0",
+        "android.hardware.audio.common@5.0-util",
+    ],
+    cflags: [
+        "-DMAJOR_VERSION=5",
+        "-DMINOR_VERSION=0",
+        "-include common/all-versions/VersionMacro.h",
+    ],
+}
+
+cc_library_shared {
+    name: "android.hardware.audio@6.0-impl-system",
+    defaults: ["android.hardware.audio-impl-system_default"],
+    shared_libs: [
+        "android.hardware.audio@6.0",
+        "android.hardware.audio@6.0-util",
+        "android.hardware.audio.common@6.0",
+        "android.hardware.audio.common@6.0-util",
+    ],
+    cflags: [
+        "-DMAJOR_VERSION=6",
+        "-DMINOR_VERSION=0",
+        "-include common/all-versions/VersionMacro.h",
+    ],
+}
+
+cc_library_shared {
+    name: "android.hardware.audio@7.0-impl-system",
+    defaults: ["android.hardware.audio-impl-system_default"],
+    shared_libs: [
+        "android.hardware.audio@7.0",
+        "android.hardware.audio@7.0-util",
+        "android.hardware.audio.common@7.0",
+        "android.hardware.audio.common@7.0-enums",
+        "android.hardware.audio.common@7.0-util",
+        "libbase",
+    ],
+    cflags: [
+        "-DMAJOR_VERSION=7",
+        "-DMINOR_VERSION=0",
+        "-include common/all-versions/VersionMacro.h",
+    ],
+}
+
+cc_library_shared {
+    name: "android.hardware.audio@7.1-impl-system",
+    defaults: ["android.hardware.audio-impl-system_default"],
+    shared_libs: [
+        "android.hardware.audio@7.0",
+        "android.hardware.audio@7.1",
+        "android.hardware.audio@7.1-util",
+        "android.hardware.audio.common@7.0",
+        "android.hardware.audio.common@7.1-enums",
+        "android.hardware.audio.common@7.1-util",
+        "libbase",
+    ],
+    cflags: [
+        "-DMAJOR_VERSION=7",
+        "-DMINOR_VERSION=1",
+        "-DCOMMON_TYPES_MINOR_VERSION=0",
+        "-DCORE_TYPES_MINOR_VERSION=0",
+        "-include common/all-versions/VersionMacro.h",
+    ],
+}

audio/hal/Device.cpp

@@ -0,0 +1,628 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "DeviceHAL"
+
+#include "Device.h"
+#include "common/all-versions/default/EffectMap.h"
+#include "StreamIn.h"
+#include "StreamOut.h"
+#include "Util.h"
+
+//#define LOG_NDEBUG 0
+
+#include <inttypes.h>
+#include <memory.h>
+#include <string.h>
+#include <algorithm>
+
+#include <android/log.h>
+#include <mediautils/MemoryLeakTrackUtil.h>
+#include <memunreachable/memunreachable.h>
+
+#include <HidlUtils.h>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CPP_VERSION {
+namespace implementation {
+
+using ::android::hardware::audio::common::COMMON_TYPES_CPP_VERSION::implementation::HidlUtils;
+namespace util {
+using namespace ::android::hardware::audio::CORE_TYPES_CPP_VERSION::implementation::util;
+}
+
+Device::Device(audio_hw_device_t* device) : mIsClosed(false), mDevice(device) {}
+
+Device::~Device() {
+    (void)doClose();
+    mDevice = nullptr;
+}
+
+Result Device::analyzeStatus(const char* funcName, int status,
+                             const std::vector<int>& ignoreErrors) {
+    return util::analyzeStatus("Device", funcName, status, ignoreErrors);
+}
+
+void Device::closeInputStream(audio_stream_in_t* stream) {
+    mDevice->close_input_stream(mDevice, stream);
+    LOG_ALWAYS_FATAL_IF(mOpenedStreamsCount == 0, "mOpenedStreamsCount is already 0");
+    --mOpenedStreamsCount;
+}
+
+void Device::closeOutputStream(audio_stream_out_t* stream) {
+    mDevice->close_output_stream(mDevice, stream);
+    LOG_ALWAYS_FATAL_IF(mOpenedStreamsCount == 0, "mOpenedStreamsCount is already 0");
+    --mOpenedStreamsCount;
+}
+
+char* Device::halGetParameters(const char* keys) {
+    return mDevice->get_parameters(mDevice, keys);
+}
+
+int Device::halSetParameters(const char* keysAndValues) {
+    return mDevice->set_parameters(mDevice, keysAndValues);
+}
+
+// Methods from ::android::hardware::audio::CPP_VERSION::IDevice follow.
+Return<Result> Device::initCheck() {
+    return analyzeStatus("init_check", mDevice->init_check(mDevice));
+}
+
+Return<Result> Device::setMasterVolume(float volume) {
+    if (mDevice->set_master_volume == NULL) {
+        return Result::NOT_SUPPORTED;
+    }
+    if (!util::isGainNormalized(volume)) {
+        ALOGW("Can not set a master volume (%f) outside [0,1]", volume);
+        return Result::INVALID_ARGUMENTS;
+    }
+    return analyzeStatus("set_master_volume", mDevice->set_master_volume(mDevice, volume),
+                         {ENOSYS} /*ignore*/);
+}
+
+Return<void> Device::getMasterVolume(getMasterVolume_cb _hidl_cb) {
+    Result retval(Result::NOT_SUPPORTED);
+    float volume = 0;
+    if (mDevice->get_master_volume != NULL) {
+        retval = analyzeStatus("get_master_volume", mDevice->get_master_volume(mDevice, &volume),
+                               {ENOSYS} /*ignore*/);
+    }
+    _hidl_cb(retval, volume);
+    return Void();
+}
+
+Return<Result> Device::setMicMute(bool mute) {
+    return analyzeStatus("set_mic_mute", mDevice->set_mic_mute(mDevice, mute), {ENOSYS} /*ignore*/);
+}
+
+Return<void> Device::getMicMute(getMicMute_cb _hidl_cb) {
+    bool mute = false;
+    Result retval = analyzeStatus("get_mic_mute", mDevice->get_mic_mute(mDevice, &mute),
+                                  {ENOSYS} /*ignore*/);
+    _hidl_cb(retval, mute);
+    return Void();
+}
+
+Return<Result> Device::setMasterMute(bool mute) {
+    Result retval(Result::NOT_SUPPORTED);
+    if (mDevice->set_master_mute != NULL) {
+        retval = analyzeStatus("set_master_mute", mDevice->set_master_mute(mDevice, mute),
+                               {ENOSYS} /*ignore*/);
+    }
+    return retval;
+}
+
+Return<void> Device::getMasterMute(getMasterMute_cb _hidl_cb) {
+    Result retval(Result::NOT_SUPPORTED);
+    bool mute = false;
+    if (mDevice->get_master_mute != NULL) {
+        retval = analyzeStatus("get_master_mute", mDevice->get_master_mute(mDevice, &mute),
+                               {ENOSYS} /*ignore*/);
+    }
+    _hidl_cb(retval, mute);
+    return Void();
+}
+
+Return<void> Device::getInputBufferSize(const AudioConfig& config, getInputBufferSize_cb _hidl_cb) {
+    audio_config_t halConfig;
+    Result retval(Result::INVALID_ARGUMENTS);
+    uint64_t bufferSize = 0;
+    if (HidlUtils::audioConfigToHal(config, &halConfig) == NO_ERROR) {
+        size_t halBufferSize = mDevice->get_input_buffer_size(mDevice, &halConfig);
+        if (halBufferSize != 0) {
+            retval = Result::OK;
+            bufferSize = halBufferSize;
+        }
+    }
+    _hidl_cb(retval, bufferSize);
+    return Void();
+}
+
+std::tuple<Result, sp<IStreamOut>> Device::openOutputStreamCore(int32_t ioHandle,
+                                                                const DeviceAddress& device,
+                                                                const AudioConfig& config,
+                                                                const AudioOutputFlags& flags,
+                                                                AudioConfig* suggestedConfig) {
+    audio_config_t halConfig;
+    if (HidlUtils::audioConfigToHal(config, &halConfig) != NO_ERROR) {
+        return {Result::INVALID_ARGUMENTS, nullptr};
+    }
+    audio_stream_out_t* halStream;
+    audio_devices_t halDevice;
+    char halDeviceAddress[AUDIO_DEVICE_MAX_ADDRESS_LEN];
+    if (CoreUtils::deviceAddressToHal(device, &halDevice, halDeviceAddress) != NO_ERROR) {
+        return {Result::INVALID_ARGUMENTS, nullptr};
+    }
+    audio_output_flags_t halFlags;
+    if (CoreUtils::audioOutputFlagsToHal(flags, &halFlags) != NO_ERROR) {
+        return {Result::INVALID_ARGUMENTS, nullptr};
+    }
+    ALOGV("open_output_stream handle: %d devices: %x flags: %#x "
+          "srate: %d format %#x channels %x address %s",
+          ioHandle, halDevice, halFlags, halConfig.sample_rate, halConfig.format,
+          halConfig.channel_mask, halDeviceAddress);
+    int status = mDevice->open_output_stream(mDevice, ioHandle, halDevice, halFlags, &halConfig,
+                                             &halStream, halDeviceAddress);
+    ALOGV("open_output_stream status %d stream %p", status, halStream);
+    sp<IStreamOut> streamOut;
+    if (status == OK) {
+        streamOut = new StreamOut(this, halStream);
+        ++mOpenedStreamsCount;
+    }
+    status_t convertStatus =
+            HidlUtils::audioConfigFromHal(halConfig, false /*isInput*/, suggestedConfig);
+    ALOGW_IF(convertStatus != OK, "%s: suggested config with incompatible fields", __func__);
+    return {analyzeStatus("open_output_stream", status, {EINVAL} /*ignore*/), streamOut};
+}
+
+std::tuple<Result, sp<IStreamIn>> Device::openInputStreamCore(
+        int32_t ioHandle, const DeviceAddress& device, const AudioConfig& config,
+        const AudioInputFlags& flags, AudioSource source, AudioConfig* suggestedConfig) {
+    audio_config_t halConfig;
+    if (HidlUtils::audioConfigToHal(config, &halConfig) != NO_ERROR) {
+        return {Result::INVALID_ARGUMENTS, nullptr};
+    }
+    audio_stream_in_t* halStream;
+    audio_devices_t halDevice;
+    char halDeviceAddress[AUDIO_DEVICE_MAX_ADDRESS_LEN];
+    if (CoreUtils::deviceAddressToHal(device, &halDevice, halDeviceAddress) != NO_ERROR) {
+        return {Result::INVALID_ARGUMENTS, nullptr};
+    }
+    audio_input_flags_t halFlags;
+    audio_source_t halSource;
+    if (CoreUtils::audioInputFlagsToHal(flags, &halFlags) != NO_ERROR ||
+        HidlUtils::audioSourceToHal(source, &halSource) != NO_ERROR) {
+        return {Result::INVALID_ARGUMENTS, nullptr};
+    }
+    ALOGV("open_input_stream handle: %d devices: %x flags: %#x "
+          "srate: %d format %#x channels %x address %s source %d",
+          ioHandle, halDevice, halFlags, halConfig.sample_rate, halConfig.format,
+          halConfig.channel_mask, halDeviceAddress, halSource);
+    int status = mDevice->open_input_stream(mDevice, ioHandle, halDevice, &halConfig, &halStream,
+                                            halFlags, halDeviceAddress, halSource);
+    ALOGV("open_input_stream status %d stream %p", status, halStream);
+    sp<IStreamIn> streamIn;
+    if (status == OK) {
+        streamIn = new StreamIn(this, halStream);
+        ++mOpenedStreamsCount;
+    }
+    status_t convertStatus =
+            HidlUtils::audioConfigFromHal(halConfig, true /*isInput*/, suggestedConfig);
+    ALOGW_IF(convertStatus != OK, "%s: suggested config with incompatible fields", __func__);
+    return {analyzeStatus("open_input_stream", status, {EINVAL} /*ignore*/), streamIn};
+}
+
+#if MAJOR_VERSION == 2
+Return<void> Device::openOutputStream(int32_t ioHandle, const DeviceAddress& device,
+                                      const AudioConfig& config, AudioOutputFlags flags,
+                                      openOutputStream_cb _hidl_cb) {
+    AudioConfig suggestedConfig;
+    auto [result, streamOut] =
+            openOutputStreamCore(ioHandle, device, config, flags, &suggestedConfig);
+    _hidl_cb(result, streamOut, suggestedConfig);
+    return Void();
+}
+
+Return<void> Device::openInputStream(int32_t ioHandle, const DeviceAddress& device,
+                                     const AudioConfig& config, AudioInputFlags flags,
+                                     AudioSource source, openInputStream_cb _hidl_cb) {
+    AudioConfig suggestedConfig;
+    auto [result, streamIn] =
+            openInputStreamCore(ioHandle, device, config, flags, source, &suggestedConfig);
+    _hidl_cb(result, streamIn, suggestedConfig);
+    return Void();
+}
+
+#elif MAJOR_VERSION >= 4
+std::tuple<Result, sp<IStreamOut>, AudioConfig> Device::openOutputStreamImpl(
+        int32_t ioHandle, const DeviceAddress& device, const AudioConfig& config,
+        const SourceMetadata& sourceMetadata,
+#if MAJOR_VERSION <= 6
+        AudioOutputFlags flags) {
+    if (status_t status = CoreUtils::sourceMetadataToHal(sourceMetadata, nullptr);
+        status != NO_ERROR) {
+#else
+        const AudioOutputFlags& flags) {
+    if (status_t status = CoreUtils::sourceMetadataToHalV7(sourceMetadata,
+                                                           false /*ignoreNonVendorTags*/, nullptr);
+        status != NO_ERROR) {
+#endif
+        return {analyzeStatus("sourceMetadataToHal", status), nullptr, {}};
+    }
+    AudioConfig suggestedConfig;
+    auto [result, streamOut] =
+            openOutputStreamCore(ioHandle, device, config, flags, &suggestedConfig);
+    if (streamOut) {
+        streamOut->updateSourceMetadata(sourceMetadata);
+    }
+    return {result, streamOut, suggestedConfig};
+}
+
+Return<void> Device::openOutputStream(int32_t ioHandle, const DeviceAddress& device,
+                                      const AudioConfig& config,
+#if MAJOR_VERSION <= 6
+                                      AudioOutputFlags flags,
+#else
+                                      const AudioOutputFlags& flags,
+#endif
+                                      const SourceMetadata& sourceMetadata,
+                                      openOutputStream_cb _hidl_cb) {
+    auto [result, streamOut, suggestedConfig] =
+            openOutputStreamImpl(ioHandle, device, config, sourceMetadata, flags);
+    _hidl_cb(result, streamOut, suggestedConfig);
+    return Void();
+}
+
+std::tuple<Result, sp<IStreamIn>, AudioConfig> Device::openInputStreamImpl(
+        int32_t ioHandle, const DeviceAddress& device, const AudioConfig& config,
+#if MAJOR_VERSION <= 6
+        AudioInputFlags flags,
+#else
+        const AudioInputFlags& flags,
+#endif
+        const SinkMetadata& sinkMetadata) {
+    if (sinkMetadata.tracks.size() == 0) {
+        // This should never happen, the framework must not create as stream
+        // if there is no client
+        ALOGE("openInputStream called without tracks connected");
+        return {Result::INVALID_ARGUMENTS, nullptr, AudioConfig{}};
+    }
+#if MAJOR_VERSION <= 6
+    if (status_t status = CoreUtils::sinkMetadataToHal(sinkMetadata, nullptr); status != NO_ERROR) {
+#else
+    if (status_t status = CoreUtils::sinkMetadataToHalV7(sinkMetadata,
+                                                         false /*ignoreNonVendorTags*/, nullptr);
+        status != NO_ERROR) {
+#endif
+        return {analyzeStatus("sinkMetadataToHal", status), nullptr, AudioConfig{}};
+    }
+    // Pick the first one as the main.
+    AudioSource source = sinkMetadata.tracks[0].source;
+    AudioConfig suggestedConfig;
+    auto [result, streamIn] =
+            openInputStreamCore(ioHandle, device, config, flags, source, &suggestedConfig);
+    if (streamIn) {
+        streamIn->updateSinkMetadata(sinkMetadata);
+    }
+    return {result, streamIn, suggestedConfig};
+}
+
+Return<void> Device::openInputStream(int32_t ioHandle, const DeviceAddress& device,
+                                     const AudioConfig& config,
+#if MAJOR_VERSION <= 6
+                                     AudioInputFlags flags,
+#else
+                                     const AudioInputFlags& flags,
+#endif
+                                     const SinkMetadata& sinkMetadata,
+                                     openInputStream_cb _hidl_cb) {
+    auto [result, streamIn, suggestedConfig] =
+            openInputStreamImpl(ioHandle, device, config, flags, sinkMetadata);
+    _hidl_cb(result, streamIn, suggestedConfig);
+    return Void();
+}
+#endif /* MAJOR_VERSION */
+
+#if MAJOR_VERSION == 7 && MINOR_VERSION == 1
+Return<void> Device::openOutputStream_7_1(int32_t ioHandle, const DeviceAddress& device,
+                                          const AudioConfig& config, const AudioOutputFlags& flags,
+                                          const SourceMetadata& sourceMetadata,
+                                          openOutputStream_7_1_cb _hidl_cb) {
+    auto [result, streamOut, suggestedConfig] =
+            openOutputStreamImpl(ioHandle, device, config, sourceMetadata, flags);
+    _hidl_cb(result, streamOut, suggestedConfig);
+    return Void();
+}
+#endif  // V7.1
+
+Return<bool> Device::supportsAudioPatches() {
+    return version() >= AUDIO_DEVICE_API_VERSION_3_0;
+}
+
+Return<void> Device::createAudioPatch(const hidl_vec<AudioPortConfig>& sources,
+                                      const hidl_vec<AudioPortConfig>& sinks,
+                                      createAudioPatch_cb _hidl_cb) {
+    auto [retval, patch] = createOrUpdateAudioPatch(AudioPatchHandle{}, sources, sinks);
+    _hidl_cb(retval, patch);
+    return Void();
+}
+
+std::tuple<Result, AudioPatchHandle> Device::createOrUpdateAudioPatch(
+        AudioPatchHandle patch, const hidl_vec<AudioPortConfig>& sources,
+        const hidl_vec<AudioPortConfig>& sinks) {
+    Result retval(Result::NOT_SUPPORTED);
+    if (version() >= AUDIO_DEVICE_API_VERSION_3_0) {
+        audio_patch_handle_t halPatch = static_cast<audio_patch_handle_t>(patch);
+        std::unique_ptr<audio_port_config[]> halSources;
+        if (status_t status = HidlUtils::audioPortConfigsToHal(sources, &halSources);
+            status != NO_ERROR) {
+            return {analyzeStatus("audioPortConfigsToHal;sources", status), patch};
+        }
+        std::unique_ptr<audio_port_config[]> halSinks;
+        if (status_t status = HidlUtils::audioPortConfigsToHal(sinks, &halSinks);
+            status != NO_ERROR) {
+            return {analyzeStatus("audioPortConfigsToHal;sinks", status), patch};
+        }
+        retval = analyzeStatus("create_audio_patch",
+                               mDevice->create_audio_patch(mDevice, sources.size(), &halSources[0],
+                                                           sinks.size(), &halSinks[0], &halPatch));
+        if (retval == Result::OK) {
+            patch = static_cast<AudioPatchHandle>(halPatch);
+        }
+    }
+    return {retval, patch};
+}
+
+Return<Result> Device::releaseAudioPatch(int32_t patch) {
+    if (version() >= AUDIO_DEVICE_API_VERSION_3_0) {
+        return analyzeStatus(
+            "release_audio_patch",
+            mDevice->release_audio_patch(mDevice, static_cast<audio_patch_handle_t>(patch)));
+    }
+    return Result::NOT_SUPPORTED;
+}
+
+template <typename HalPort>
+Return<void> Device::getAudioPortImpl(const AudioPort& port, getAudioPort_cb _hidl_cb,
+                                      int (*halGetter)(audio_hw_device_t*, HalPort*),
+                                      const char* halGetterName) {
+    HalPort halPort;
+    if (status_t status = HidlUtils::audioPortToHal(port, &halPort); status != NO_ERROR) {
+        _hidl_cb(analyzeStatus("audioPortToHal", status), port);
+        return Void();
+    }
+    Result retval = analyzeStatus(halGetterName, halGetter(mDevice, &halPort));
+    AudioPort resultPort = port;
+    if (retval == Result::OK) {
+        if (status_t status = HidlUtils::audioPortFromHal(halPort, &resultPort);
+            status != NO_ERROR) {
+            _hidl_cb(analyzeStatus("audioPortFromHal", status), port);
+            return Void();
+        }
+    }
+    _hidl_cb(retval, resultPort);
+    return Void();
+}
+
+#if MAJOR_VERSION <= 6
+Return<void> Device::getAudioPort(const AudioPort& port, getAudioPort_cb _hidl_cb) {
+    return getAudioPortImpl(port, _hidl_cb, mDevice->get_audio_port, "get_audio_port");
+}
+#else
+Return<void> Device::getAudioPort(const AudioPort& port, getAudioPort_cb _hidl_cb) {
+    if (version() >= AUDIO_DEVICE_API_VERSION_3_2) {
+        // get_audio_port_v7 is mandatory if legacy HAL support this API version.
+        return getAudioPortImpl(port, _hidl_cb, mDevice->get_audio_port_v7, "get_audio_port_v7");
+    } else {
+        return getAudioPortImpl(port, _hidl_cb, mDevice->get_audio_port, "get_audio_port");
+    }
+}
+#endif
+
+Return<Result> Device::setAudioPortConfig(const AudioPortConfig& config) {
+    if (version() >= AUDIO_DEVICE_API_VERSION_3_0) {
+        struct audio_port_config halPortConfig;
+        if (status_t status = HidlUtils::audioPortConfigToHal(config, &halPortConfig);
+            status != NO_ERROR) {
+            return analyzeStatus("audioPortConfigToHal", status);
+        }
+        return analyzeStatus("set_audio_port_config",
+                             mDevice->set_audio_port_config(mDevice, &halPortConfig));
+    }
+    return Result::NOT_SUPPORTED;
+}
+
+#if MAJOR_VERSION == 2
+Return<AudioHwSync> Device::getHwAvSync() {
+    int halHwAvSync;
+    Result retval = getParam(AudioParameter::keyHwAvSync, &halHwAvSync);
+    return retval == Result::OK ? halHwAvSync : AUDIO_HW_SYNC_INVALID;
+}
+#elif MAJOR_VERSION >= 4
+Return<void> Device::getHwAvSync(getHwAvSync_cb _hidl_cb) {
+    int halHwAvSync;
+    Result retval = getParam(AudioParameter::keyHwAvSync, &halHwAvSync);
+    _hidl_cb(retval, halHwAvSync);
+    return Void();
+}
+#endif
+
+Return<Result> Device::setScreenState(bool turnedOn) {
+    return setParam(AudioParameter::keyScreenState, turnedOn);
+}
+
+#if MAJOR_VERSION == 2
+Return<void> Device::getParameters(const hidl_vec<hidl_string>& keys, getParameters_cb _hidl_cb) {
+    getParametersImpl({}, keys, _hidl_cb);
+    return Void();
+}
+
+Return<Result> Device::setParameters(const hidl_vec<ParameterValue>& parameters) {
+    return setParametersImpl({} /* context */, parameters);
+}
+#elif MAJOR_VERSION >= 4
+Return<void> Device::getParameters(const hidl_vec<ParameterValue>& context,
+                                   const hidl_vec<hidl_string>& keys, getParameters_cb _hidl_cb) {
+    getParametersImpl(context, keys, _hidl_cb);
+    return Void();
+}
+Return<Result> Device::setParameters(const hidl_vec<ParameterValue>& context,
+                                     const hidl_vec<ParameterValue>& parameters) {
+    return setParametersImpl(context, parameters);
+}
+#endif
+
+#if MAJOR_VERSION == 2
+Return<void> Device::debugDump(const hidl_handle& fd) {
+    return debug(fd, {});
+}
+#endif
+
+Return<void> Device::debug(const hidl_handle& fd, const hidl_vec<hidl_string>& options) {
+    if (fd.getNativeHandle() != nullptr && fd->numFds == 1) {
+        const int fd0 = fd->data[0];
+        bool dumpMem = false;
+        bool unreachableMemory = false;
+        for (const auto& option : options) {
+            if (option == "-m") {
+                dumpMem = true;
+            } else if (option == "--unreachable") {
+                unreachableMemory = true;
+            }
+        }
+
+        if (dumpMem) {
+            dprintf(fd0, "\nDumping memory:\n");
+            std::string s = dumpMemoryAddresses(100 /* limit */);
+            write(fd0, s.c_str(), s.size());
+        }
+        if (unreachableMemory) {
+            dprintf(fd0, "\nDumping unreachable memory:\n");
+            // TODO - should limit be an argument parameter?
+            std::string s = GetUnreachableMemoryString(true /* contents */, 100 /* limit */);
+            write(fd0, s.c_str(), s.size());
+        }
+
+        analyzeStatus("dump", mDevice->dump(mDevice, fd0));
+    }
+    return Void();
+}
+
+#if MAJOR_VERSION >= 4
+Return<void> Device::getMicrophones(getMicrophones_cb _hidl_cb) {
+    Result retval = Result::NOT_SUPPORTED;
+    size_t actual_mics = AUDIO_MICROPHONE_MAX_COUNT;
+    audio_microphone_characteristic_t mic_array[AUDIO_MICROPHONE_MAX_COUNT];
+
+    hidl_vec<MicrophoneInfo> microphones;
+    if (mDevice->get_microphones != NULL &&
+        mDevice->get_microphones(mDevice, &mic_array[0], &actual_mics) == 0) {
+        microphones.resize(actual_mics);
+        for (size_t i = 0; i < actual_mics; ++i) {
+            (void)CoreUtils::microphoneInfoFromHal(mic_array[i], &microphones[i]);
+        }
+        retval = Result::OK;
+    }
+    _hidl_cb(retval, microphones);
+    return Void();
+}
+
+Return<Result> Device::setConnectedState(const DeviceAddress& address, bool connected) {
+    auto key = connected ? AudioParameter::keyDeviceConnect : AudioParameter::keyDeviceDisconnect;
+    return setParam(key, address);
+}
+#endif
+
+Result Device::doClose() {
+    if (mIsClosed || mOpenedStreamsCount != 0) return Result::INVALID_STATE;
+    mIsClosed = true;
+    return analyzeStatus("close", audio_hw_device_close(mDevice));
+}
+
+#if MAJOR_VERSION >= 6
+Return<Result> Device::close() {
+    return doClose();
+}
+
+Return<Result> Device::addDeviceEffect(AudioPortHandle device, uint64_t effectId) {
+    if (version() < AUDIO_DEVICE_API_VERSION_3_1 || mDevice->add_device_effect == nullptr) {
+        return Result::NOT_SUPPORTED;
+    }
+
+    effect_handle_t halEffect = EffectMap::getInstance().get(effectId);
+    if (halEffect != NULL) {
+        return analyzeStatus("add_device_effect",
+                             mDevice->add_device_effect(
+                                     mDevice, static_cast<audio_port_handle_t>(device), halEffect));
+    } else {
+        ALOGW("%s Invalid effect ID passed from client: %" PRIu64 "", __func__, effectId);
+        return Result::INVALID_ARGUMENTS;
+    }
+}
+
+Return<Result> Device::removeDeviceEffect(AudioPortHandle device, uint64_t effectId) {
+    if (version() < AUDIO_DEVICE_API_VERSION_3_1 || mDevice->remove_device_effect == nullptr) {
+        return Result::NOT_SUPPORTED;
+    }
+
+    effect_handle_t halEffect = EffectMap::getInstance().get(effectId);
+    if (halEffect != NULL) {
+        return analyzeStatus("remove_device_effect",
+                             mDevice->remove_device_effect(
+                                     mDevice, static_cast<audio_port_handle_t>(device), halEffect));
+    } else {
+        ALOGW("%s Invalid effect ID passed from client: %" PRIu64 "", __func__, effectId);
+        return Result::INVALID_ARGUMENTS;
+    }
+}
+
+Return<void> Device::updateAudioPatch(int32_t previousPatch,
+                                      const hidl_vec<AudioPortConfig>& sources,
+                                      const hidl_vec<AudioPortConfig>& sinks,
+                                      createAudioPatch_cb _hidl_cb) {
+    if (previousPatch != static_cast<int32_t>(AudioPatchHandle{})) {
+        auto [retval, patch] = createOrUpdateAudioPatch(previousPatch, sources, sinks);
+        _hidl_cb(retval, patch);
+    } else {
+        _hidl_cb(Result::INVALID_ARGUMENTS, previousPatch);
+    }
+    return Void();
+}
+
+#endif
+
+#if MAJOR_VERSION == 7 && MINOR_VERSION == 1
+Return<Result> Device::setConnectedState_7_1(const AudioPort& devicePort, bool connected) {
+    if (version() >= AUDIO_DEVICE_API_VERSION_3_2 &&
+        mDevice->set_device_connected_state_v7 != nullptr) {
+        audio_port_v7 halPort;
+        if (status_t status = HidlUtils::audioPortToHal(devicePort, &halPort); status != NO_ERROR) {
+            return analyzeStatus("audioPortToHal", status);
+        }
+        return analyzeStatus("set_device_connected_state_v7",
+                             mDevice->set_device_connected_state_v7(mDevice, &halPort, connected));
+    }
+    return Result::NOT_SUPPORTED;
+}
+#endif
+
+}  // namespace implementation
+}  // namespace CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android

audio/hal/Device.h

@@ -0,0 +1,203 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_AUDIO_DEVICE_H
+#define ANDROID_HARDWARE_AUDIO_DEVICE_H
+
+#include PATH(android/hardware/audio/FILE_VERSION/IDevice.h)
+
+#include "ParametersUtil.h"
+
+#include <memory>
+
+#include <hardware/audio.h>
+#include <media/AudioParameter.h>
+
+#include <hidl/Status.h>
+
+#include <hidl/MQDescriptor.h>
+
+#include <VersionUtils.h>
+#include <util/CoreUtils.h>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CPP_VERSION {
+namespace implementation {
+
+using ::android::sp;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::hardware::audio::CORE_TYPES_CPP_VERSION::implementation::CoreUtils;
+using ::android::hardware::audio::CORE_TYPES_CPP_VERSION::implementation::ParametersUtil;
+using namespace ::android::hardware::audio::common::COMMON_TYPES_CPP_VERSION;
+using namespace ::android::hardware::audio::CORE_TYPES_CPP_VERSION;
+using namespace ::android::hardware::audio::CPP_VERSION;
+using AudioInputFlags = CoreUtils::AudioInputFlags;
+using AudioOutputFlags = CoreUtils::AudioOutputFlags;
+
+struct Device : public IDevice, public ParametersUtil {
+    explicit Device(audio_hw_device_t* device);
+
+    // Methods from ::android::hardware::audio::CPP_VERSION::IDevice follow.
+    Return<Result> initCheck() override;
+    Return<Result> setMasterVolume(float volume) override;
+    Return<void> getMasterVolume(getMasterVolume_cb _hidl_cb) override;
+    Return<Result> setMicMute(bool mute) override;
+    Return<void> getMicMute(getMicMute_cb _hidl_cb) override;
+    Return<Result> setMasterMute(bool mute) override;
+    Return<void> getMasterMute(getMasterMute_cb _hidl_cb) override;
+    Return<void> getInputBufferSize(const AudioConfig& config,
+                                    getInputBufferSize_cb _hidl_cb) override;
+
+    std::tuple<Result, sp<IStreamOut>> openOutputStreamCore(int32_t ioHandle,
+                                                            const DeviceAddress& device,
+                                                            const AudioConfig& config,
+                                                            const AudioOutputFlags& flags,
+                                                            AudioConfig* suggestedConfig);
+    std::tuple<Result, sp<IStreamIn>> openInputStreamCore(
+            int32_t ioHandle, const DeviceAddress& device, const AudioConfig& config,
+            const AudioInputFlags& flags, AudioSource source, AudioConfig* suggestedConfig);
+#if MAJOR_VERSION >= 4
+    std::tuple<Result, sp<IStreamOut>, AudioConfig> openOutputStreamImpl(
+            int32_t ioHandle, const DeviceAddress& device, const AudioConfig& config,
+            const SourceMetadata& sourceMetadata,
+#if MAJOR_VERSION <= 6
+            AudioOutputFlags flags);
+#else
+            const AudioOutputFlags& flags);
+#endif
+    std::tuple<Result, sp<IStreamIn>, AudioConfig> openInputStreamImpl(
+            int32_t ioHandle, const DeviceAddress& device, const AudioConfig& config,
+#if MAJOR_VERSION <= 6
+            AudioInputFlags flags,
+#else
+            const AudioInputFlags& flags,
+#endif
+            const SinkMetadata& sinkMetadata);
+#endif  // MAJOR_VERSION >= 4
+
+    Return<void> openOutputStream(int32_t ioHandle, const DeviceAddress& device,
+                                  const AudioConfig& config,
+#if MAJOR_VERSION <= 6
+                                  AudioOutputFlags flags,
+#else
+                                  const AudioOutputFlags& flags,
+#endif
+#if MAJOR_VERSION >= 4
+                                  const SourceMetadata& sourceMetadata,
+#endif
+                                  openOutputStream_cb _hidl_cb) override;
+    Return<void> openInputStream(int32_t ioHandle, const DeviceAddress& device,
+                                 const AudioConfig& config,
+#if MAJOR_VERSION <= 6
+                                 AudioInputFlags flags,
+#else
+                                 const AudioInputFlags& flags,
+#endif
+#if MAJOR_VERSION == 2
+                                 AudioSource source,
+#elif MAJOR_VERSION >= 4
+                                 const SinkMetadata& sinkMetadata,
+#endif
+                                 openInputStream_cb _hidl_cb) override;
+
+#if MAJOR_VERSION == 7 && MINOR_VERSION == 1
+    Return<void> openOutputStream_7_1(int32_t ioHandle, const DeviceAddress& device,
+                                      const AudioConfig& config, const AudioOutputFlags& flags,
+                                      const SourceMetadata& sourceMetadata,
+                                      openOutputStream_7_1_cb _hidl_cb) override;
+#endif
+
+    Return<bool> supportsAudioPatches() override;
+    Return<void> createAudioPatch(const hidl_vec<AudioPortConfig>& sources,
+                                  const hidl_vec<AudioPortConfig>& sinks,
+                                  createAudioPatch_cb _hidl_cb) override;
+    Return<Result> releaseAudioPatch(int32_t patch) override;
+    Return<void> getAudioPort(const AudioPort& port, getAudioPort_cb _hidl_cb) override;
+    Return<Result> setAudioPortConfig(const AudioPortConfig& config) override;
+
+    Return<Result> setScreenState(bool turnedOn) override;
+
+#if MAJOR_VERSION == 2
+    Return<AudioHwSync> getHwAvSync() override;
+    Return<void> getParameters(const hidl_vec<hidl_string>& keys,
+                               getParameters_cb _hidl_cb) override;
+    Return<Result> setParameters(const hidl_vec<ParameterValue>& parameters) override;
+    Return<void> debugDump(const hidl_handle& fd) override;
+#elif MAJOR_VERSION >= 4
+    Return<void> getHwAvSync(getHwAvSync_cb _hidl_cb) override;
+    Return<void> getParameters(const hidl_vec<ParameterValue>& context,
+                               const hidl_vec<hidl_string>& keys,
+                               getParameters_cb _hidl_cb) override;
+    Return<Result> setParameters(const hidl_vec<ParameterValue>& context,
+                                 const hidl_vec<ParameterValue>& parameters) override;
+    Return<void> getMicrophones(getMicrophones_cb _hidl_cb) override;
+    Return<Result> setConnectedState(const DeviceAddress& address, bool connected) override;
+#endif
+#if MAJOR_VERSION >= 6
+    Return<Result> close() override;
+    Return<Result> addDeviceEffect(AudioPortHandle device, uint64_t effectId) override;
+    Return<Result> removeDeviceEffect(AudioPortHandle device, uint64_t effectId) override;
+    Return<void> updateAudioPatch(int32_t previousPatch, const hidl_vec<AudioPortConfig>& sources,
+                                  const hidl_vec<AudioPortConfig>& sinks,
+                                  createAudioPatch_cb _hidl_cb) override;
+#endif
+#if MAJOR_VERSION == 7 && MINOR_VERSION == 1
+    Return<Result> setConnectedState_7_1(const AudioPort& devicePort, bool connected) override;
+#endif
+    Return<void> debug(const hidl_handle& fd, const hidl_vec<hidl_string>& options) override;
+
+    // Utility methods for extending interfaces.
+    Result analyzeStatus(const char* funcName, int status,
+                         const std::vector<int>& ignoreErrors = {});
+    void closeInputStream(audio_stream_in_t* stream);
+    void closeOutputStream(audio_stream_out_t* stream);
+    audio_hw_device_t* device() const { return mDevice; }
+
+    uint32_t version() const { return mDevice->common.version; }
+
+  private:
+    bool mIsClosed;
+    audio_hw_device_t* mDevice;
+    int mOpenedStreamsCount = 0;
+
+    virtual ~Device();
+
+    Result doClose();
+    std::tuple<Result, AudioPatchHandle> createOrUpdateAudioPatch(
+            AudioPatchHandle patch, const hidl_vec<AudioPortConfig>& sources,
+            const hidl_vec<AudioPortConfig>& sinks);
+    template <typename HalPort>
+    Return<void> getAudioPortImpl(const AudioPort& port, getAudioPort_cb _hidl_cb,
+                                  int (*halGetter)(audio_hw_device_t*, HalPort*),
+                                  const char* halGetterName);
+
+    // Methods from ParametersUtil.
+    char* halGetParameters(const char* keys) override;
+    int halSetParameters(const char* keysAndValues) override;
+};
+
+}  // namespace implementation
+}  // namespace CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_AUDIO_DEVICE_H

audio/hal/DevicesFactory.cpp

@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "DevicesFactoryHAL"
+
+#include "DevicesFactory.h"
+#include "Device.h"
+#include "PrimaryDevice.h"
+
+#include <string.h>
+
+#include <android/log.h>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CPP_VERSION {
+namespace implementation {
+
+#if MAJOR_VERSION == 2
+Return<void> DevicesFactory::openDevice(IDevicesFactory::Device device, openDevice_cb _hidl_cb) {
+    switch (device) {
+        case IDevicesFactory::Device::PRIMARY:
+            return openDevice<PrimaryDevice>(AUDIO_HARDWARE_MODULE_ID_PRIMARY, _hidl_cb);
+        case IDevicesFactory::Device::A2DP:
+            return openDevice(AUDIO_HARDWARE_MODULE_ID_A2DP, _hidl_cb);
+        case IDevicesFactory::Device::USB:
+            return openDevice(AUDIO_HARDWARE_MODULE_ID_USB, _hidl_cb);
+        case IDevicesFactory::Device::R_SUBMIX:
+            return openDevice(AUDIO_HARDWARE_MODULE_ID_REMOTE_SUBMIX, _hidl_cb);
+        case IDevicesFactory::Device::STUB:
+            return openDevice(AUDIO_HARDWARE_MODULE_ID_STUB, _hidl_cb);
+    }
+    _hidl_cb(Result::INVALID_ARGUMENTS, nullptr);
+    return Void();
+}
+
+Return<void> DevicesFactory::openDevice(const char* moduleName, openDevice_cb _hidl_cb) {
+    return openDevice<implementation::Device>(moduleName, _hidl_cb);
+}
+#elif MAJOR_VERSION >= 4
+Return<void> DevicesFactory::openDevice(const hidl_string& moduleName, openDevice_cb _hidl_cb) {
+    if (moduleName == AUDIO_HARDWARE_MODULE_ID_PRIMARY) {
+        return openDevice<PrimaryDevice>(moduleName.c_str(), _hidl_cb);
+    }
+    return openDevice<implementation::Device>(moduleName.c_str(), _hidl_cb);
+}
+Return<void> DevicesFactory::openPrimaryDevice(openPrimaryDevice_cb _hidl_cb) {
+    return openDevice<PrimaryDevice>(AUDIO_HARDWARE_MODULE_ID_PRIMARY, _hidl_cb);
+}
+#endif
+
+#if MAJOR_VERSION == 7 && MINOR_VERSION == 1
+Return<void> DevicesFactory::openDevice_7_1(const hidl_string& moduleName,
+                                            openDevice_7_1_cb _hidl_cb) {
+    if (moduleName == AUDIO_HARDWARE_MODULE_ID_PRIMARY) {
+        Result result;
+        sp<IPrimaryDevice> primary;
+        auto ret = openDevice<PrimaryDevice>(
+                AUDIO_HARDWARE_MODULE_ID_PRIMARY,
+                [&result, &primary](Result r, const sp<IPrimaryDevice>& p) {
+                    result = r;
+                    primary = p;
+                });
+        if (ret.isOk() && result == Result::OK && primary != nullptr) {
+            auto getDeviceRet = primary->getDevice();
+            if (getDeviceRet.isOk()) {
+                _hidl_cb(result, getDeviceRet);
+            } else {
+                _hidl_cb(Result::NOT_INITIALIZED, nullptr);
+            }
+        } else {
+            _hidl_cb(result, nullptr);
+        }
+        return Void();
+    }
+    return openDevice<implementation::Device>(moduleName.c_str(), _hidl_cb);
+}
+
+Return<void> DevicesFactory::openPrimaryDevice_7_1(openPrimaryDevice_7_1_cb _hidl_cb) {
+    return openDevice<PrimaryDevice>(AUDIO_HARDWARE_MODULE_ID_PRIMARY, _hidl_cb);
+}
+#endif  // V7.1
+
+template <class DeviceShim, class Callback>
+Return<void> DevicesFactory::openDevice(const char* moduleName, Callback _hidl_cb) {
+    audio_hw_device_t* halDevice;
+    Result retval(Result::INVALID_ARGUMENTS);
+    sp<DeviceShim> result;
+    int halStatus = loadAudioInterface(moduleName, &halDevice);
+    if (halStatus == OK) {
+        result = new DeviceShim(halDevice);
+        retval = Result::OK;
+    } else if (halStatus == -EINVAL) {
+        retval = Result::NOT_INITIALIZED;
+    }
+    _hidl_cb(retval, result);
+    return Void();
+}
+
+// static
+int DevicesFactory::loadAudioInterface(const char* if_name, audio_hw_device_t** dev) {
+    const hw_module_t* mod;
+    int rc;
+
+    rc = hw_get_module_by_class(AUDIO_HARDWARE_MODULE_ID, if_name, &mod);
+    if (rc) {
+        ALOGE("%s couldn't load audio hw module %s.%s (%s)", __func__, AUDIO_HARDWARE_MODULE_ID,
+              if_name, strerror(-rc));
+        goto out;
+    }
+    rc = audio_hw_device_open(mod, dev);
+    if (rc) {
+        ALOGE("%s couldn't open audio hw device in %s.%s (%s)", __func__, AUDIO_HARDWARE_MODULE_ID,
+              if_name, strerror(-rc));
+        goto out;
+    }
+    if ((*dev)->common.version < AUDIO_DEVICE_API_VERSION_MIN) {
+        ALOGE("%s wrong audio hw device version %04x", __func__, (*dev)->common.version);
+        rc = -EINVAL;
+        audio_hw_device_close(*dev);
+        goto out;
+    }
+    return OK;
+
+out:
+    *dev = NULL;
+    return rc;
+}
+
+IDevicesFactory* HIDL_FETCH_IDevicesFactory(const char* name) {
+    return new DevicesFactory();
+}
+
+}  // namespace implementation
+}  // namespace CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android

audio/hal/DevicesFactory.h

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_AUDIO_DEVICESFACTORY_H
+#define ANDROID_HARDWARE_AUDIO_DEVICESFACTORY_H
+
+#include PATH(android/hardware/audio/FILE_VERSION/IDevicesFactory.h)
+
+#include <hardware/audio.h>
+
+#include <hidl/Status.h>
+
+#include <hidl/MQDescriptor.h>
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CPP_VERSION {
+namespace implementation {
+
+using ::android::sp;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using namespace ::android::hardware::audio::CPP_VERSION;
+
+struct DevicesFactory : public IDevicesFactory {
+#if MAJOR_VERSION == 2
+    Return<void> openDevice(IDevicesFactory::Device device, openDevice_cb _hidl_cb) override;
+#elif MAJOR_VERSION >= 4
+    Return<void> openDevice(const hidl_string& device, openDevice_cb _hidl_cb) override;
+    Return<void> openPrimaryDevice(openPrimaryDevice_cb _hidl_cb) override;
+#endif
+#if MAJOR_VERSION == 7 && MINOR_VERSION == 1
+    Return<void> openDevice_7_1(const hidl_string& device, openDevice_7_1_cb _hidl_cb) override;
+    Return<void> openPrimaryDevice_7_1(openPrimaryDevice_7_1_cb _hidl_cb) override;
+#endif
+
+  private:
+    template <class DeviceShim, class Callback>
+    Return<void> openDevice(const char* moduleName, Callback _hidl_cb);
+#if MAJOR_VERSION == 2
+    Return<void> openDevice(const char* moduleName, openDevice_cb _hidl_cb);
+#endif
+
+    static int loadAudioInterface(const char* if_name, audio_hw_device_t** dev);
+};
+
+extern "C" IDevicesFactory* HIDL_FETCH_IDevicesFactory(const char* name);
+
+}  // namespace implementation
+}  // namespace CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_AUDIO_DEVICESFACTORY_H

audio/hal/ParametersUtil.cpp

@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ParametersUtil.h"
+#include "Util.h"
+
+#include <system/audio.h>
+
+#include <util/CoreUtils.h>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CORE_TYPES_CPP_VERSION {
+namespace implementation {
+
+/** Converts a status_t in Result according to the rules of AudioParameter::get*
+ * Note: Static method and not private method to avoid leaking status_t dependency
+ */
+static Result getHalStatusToResult(status_t status) {
+    switch (status) {
+        case OK:
+            return Result::OK;
+        case BAD_VALUE:  // Nothing was returned, probably because the HAL does
+                         // not handle it
+            return Result::NOT_SUPPORTED;
+        case INVALID_OPERATION:  // Conversion from string to the requested type
+                                 // failed
+            return Result::INVALID_ARGUMENTS;
+        default:  // Should not happen
+            ALOGW("Unexpected status returned by getParam: %u", status);
+            return Result::INVALID_ARGUMENTS;
+    }
+}
+
+Result ParametersUtil::getParam(const char* name, bool* value) {
+    String8 halValue;
+    Result retval = getParam(name, &halValue);
+    *value = false;
+    if (retval == Result::OK) {
+        if (halValue.empty()) {
+            return Result::NOT_SUPPORTED;
+        }
+        *value = !(halValue == AudioParameter::valueOff);
+    }
+    return retval;
+}
+
+Result ParametersUtil::getParam(const char* name, int* value) {
+    const String8 halName(name);
+    AudioParameter keys;
+    keys.addKey(halName);
+    std::unique_ptr<AudioParameter> params = getParams(keys);
+    return getHalStatusToResult(params->getInt(halName, *value));
+}
+
+Result ParametersUtil::getParam(const char* name, String8* value, AudioParameter context) {
+    const String8 halName(name);
+    context.addKey(halName);
+    std::unique_ptr<AudioParameter> params = getParams(context);
+    return getHalStatusToResult(params->get(halName, *value));
+}
+
+void ParametersUtil::getParametersImpl(
+    const hidl_vec<ParameterValue>& context, const hidl_vec<hidl_string>& keys,
+    std::function<void(Result retval, const hidl_vec<ParameterValue>& parameters)> cb) {
+    AudioParameter halKeys;
+    for (auto& pair : context) {
+        halKeys.add(String8(pair.key.c_str()), String8(pair.value.c_str()));
+    }
+    for (size_t i = 0; i < keys.size(); ++i) {
+        halKeys.addKey(String8(keys[i].c_str()));
+    }
+    std::unique_ptr<AudioParameter> halValues = getParams(halKeys);
+    Result retval =
+        (keys.size() == 0 || halValues->size() != 0) ? Result::OK : Result::NOT_SUPPORTED;
+    hidl_vec<ParameterValue> result;
+    result.resize(halValues->size());
+    String8 halKey, halValue;
+    for (size_t i = 0; i < halValues->size(); ++i) {
+        status_t status = halValues->getAt(i, halKey, halValue);
+        if (status != OK) {
+            result.resize(0);
+            retval = getHalStatusToResult(status);
+            break;
+        }
+        result[i].key = halKey.string();
+        result[i].value = halValue.string();
+    }
+    cb(retval, result);
+}
+
+std::unique_ptr<AudioParameter> ParametersUtil::getParams(const AudioParameter& keys) {
+    String8 paramsAndValues;
+    char* halValues = halGetParameters(keys.keysToString().string());
+    if (halValues != NULL) {
+        paramsAndValues.setTo(halValues);
+        free(halValues);
+    } else {
+        paramsAndValues.clear();
+    }
+    return std::unique_ptr<AudioParameter>(new AudioParameter(paramsAndValues));
+}
+
+Result ParametersUtil::setParam(const char* name, const char* value) {
+    AudioParameter param;
+    param.add(String8(name), String8(value));
+    return setParams(param);
+}
+
+Result ParametersUtil::setParam(const char* name, bool value) {
+    AudioParameter param;
+    param.add(String8(name), String8(value ? AudioParameter::valueOn : AudioParameter::valueOff));
+    return setParams(param);
+}
+
+Result ParametersUtil::setParam(const char* name, int value) {
+    AudioParameter param;
+    param.addInt(String8(name), value);
+    return setParams(param);
+}
+
+Result ParametersUtil::setParam(const char* name, float value) {
+    AudioParameter param;
+    param.addFloat(String8(name), value);
+    return setParams(param);
+}
+
+Result ParametersUtil::setParametersImpl(const hidl_vec<ParameterValue>& context,
+                                         const hidl_vec<ParameterValue>& parameters) {
+    AudioParameter params;
+    for (auto& pair : context) {
+        params.add(String8(pair.key.c_str()), String8(pair.value.c_str()));
+    }
+    for (size_t i = 0; i < parameters.size(); ++i) {
+        params.add(String8(parameters[i].key.c_str()), String8(parameters[i].value.c_str()));
+    }
+    return setParams(params);
+}
+
+Result ParametersUtil::setParam(const char* name, const DeviceAddress& address) {
+    audio_devices_t halDeviceType;
+    char halDeviceAddress[AUDIO_DEVICE_MAX_ADDRESS_LEN];
+    if (CoreUtils::deviceAddressToHal(address, &halDeviceType, halDeviceAddress) != NO_ERROR) {
+        return Result::INVALID_ARGUMENTS;
+    }
+    AudioParameter params{String8(halDeviceAddress)};
+    params.addInt(String8(name), halDeviceType);
+    return setParams(params);
+}
+
+Result ParametersUtil::setParams(const AudioParameter& param) {
+    int halStatus = halSetParameters(param.toString().string());
+    return util::analyzeStatus(halStatus);
+}
+
+}  // namespace implementation
+}  // namespace CORE_TYPES_CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android

audio/hal/ParametersUtil.h

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_AUDIO_PARAMETERS_UTIL_H_
+#define ANDROID_HARDWARE_AUDIO_PARAMETERS_UTIL_H_
+
+// clang-format off
+#include PATH(android/hardware/audio/common/COMMON_TYPES_FILE_VERSION/types.h)
+#include PATH(android/hardware/audio/CORE_TYPES_FILE_VERSION/types.h)
+// clang-format on
+
+#include <functional>
+#include <memory>
+
+#include <hidl/HidlSupport.h>
+#include <media/AudioParameter.h>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CORE_TYPES_CPP_VERSION {
+namespace implementation {
+
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using namespace ::android::hardware::audio::common::COMMON_TYPES_CPP_VERSION;
+using namespace ::android::hardware::audio::CORE_TYPES_CPP_VERSION;
+
+class ParametersUtil {
+   public:
+    Result setParam(const char* name, const char* value);
+    Result getParam(const char* name, bool* value);
+    Result getParam(const char* name, int* value);
+    Result getParam(const char* name, String8* value, AudioParameter context = {});
+    void getParametersImpl(
+        const hidl_vec<ParameterValue>& context, const hidl_vec<hidl_string>& keys,
+        std::function<void(Result retval, const hidl_vec<ParameterValue>& parameters)> cb);
+    std::unique_ptr<AudioParameter> getParams(const AudioParameter& keys);
+    Result setParam(const char* name, bool value);
+    Result setParam(const char* name, int value);
+    Result setParam(const char* name, float value);
+    Result setParametersImpl(const hidl_vec<ParameterValue>& context,
+                             const hidl_vec<ParameterValue>& parameters);
+    Result setParams(const AudioParameter& param);
+    Result setParam(const char* name, const DeviceAddress& address);
+
+   protected:
+    virtual ~ParametersUtil() {}
+
+    virtual char* halGetParameters(const char* keys) = 0;
+    virtual int halSetParameters(const char* keysAndValues) = 0;
+};
+
+}  // namespace implementation
+}  // namespace CORE_TYPES_CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_AUDIO_PARAMETERS_UTIL_H_

audio/hal/PrimaryDevice.cpp

@@ -0,0 +1,355 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "PrimaryDeviceHAL"
+
+#include "PrimaryDevice.h"
+#include "Util.h"
+
+#if MAJOR_VERSION >= 4
+#include <cmath>
+#endif
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CPP_VERSION {
+namespace implementation {
+
+namespace util {
+using namespace ::android::hardware::audio::CORE_TYPES_CPP_VERSION::implementation::util;
+}
+
+PrimaryDevice::PrimaryDevice(audio_hw_device_t* device) : mDevice(new Device(device)) {}
+
+PrimaryDevice::~PrimaryDevice() {
+    // Do not call mDevice->close here. If there are any unclosed streams,
+    // they only hold IDevice instance, not IPrimaryDevice, thus IPrimaryDevice
+    // "part" of a device can be destroyed before the streams.
+}
+
+// Methods from ::android::hardware::audio::CPP_VERSION::IDevice follow.
+Return<Result> PrimaryDevice::initCheck() {
+    return mDevice->initCheck();
+}
+
+Return<Result> PrimaryDevice::setMasterVolume(float volume) {
+    return mDevice->setMasterVolume(volume);
+}
+
+Return<void> PrimaryDevice::getMasterVolume(getMasterVolume_cb _hidl_cb) {
+    return mDevice->getMasterVolume(_hidl_cb);
+}
+
+Return<Result> PrimaryDevice::setMicMute(bool mute) {
+    return mDevice->setMicMute(mute);
+}
+
+Return<void> PrimaryDevice::getMicMute(getMicMute_cb _hidl_cb) {
+    return mDevice->getMicMute(_hidl_cb);
+}
+
+Return<Result> PrimaryDevice::setMasterMute(bool mute) {
+    return mDevice->setMasterMute(mute);
+}
+
+Return<void> PrimaryDevice::getMasterMute(getMasterMute_cb _hidl_cb) {
+    return mDevice->getMasterMute(_hidl_cb);
+}
+
+Return<void> PrimaryDevice::getInputBufferSize(const AudioConfig& config,
+                                               getInputBufferSize_cb _hidl_cb) {
+    return mDevice->getInputBufferSize(config, _hidl_cb);
+}
+
+#if MAJOR_VERSION == 2
+Return<void> PrimaryDevice::openOutputStream(int32_t ioHandle, const DeviceAddress& device,
+                                             const AudioConfig& config, AudioOutputFlags flags,
+                                             openOutputStream_cb _hidl_cb) {
+    return mDevice->openOutputStream(ioHandle, device, config, flags, _hidl_cb);
+}
+
+Return<void> PrimaryDevice::openInputStream(int32_t ioHandle, const DeviceAddress& device,
+                                            const AudioConfig& config, AudioInputFlags flags,
+                                            AudioSource source, openInputStream_cb _hidl_cb) {
+    return mDevice->openInputStream(ioHandle, device, config, flags, source, _hidl_cb);
+}
+#elif MAJOR_VERSION >= 4
+Return<void> PrimaryDevice::openOutputStream(int32_t ioHandle, const DeviceAddress& device,
+                                             const AudioConfig& config,
+#if MAJOR_VERSION <= 6
+                                             AudioOutputFlags flags,
+#else
+                                             const AudioOutputFlags& flags,
+#endif
+                                             const SourceMetadata& sourceMetadata,
+                                             openOutputStream_cb _hidl_cb) {
+    return mDevice->openOutputStream(ioHandle, device, config, flags, sourceMetadata, _hidl_cb);
+}
+
+Return<void> PrimaryDevice::openInputStream(int32_t ioHandle, const DeviceAddress& device,
+                                            const AudioConfig& config,
+#if MAJOR_VERSION <= 6
+                                            AudioInputFlags flags,
+#else
+                                            const AudioInputFlags& flags,
+#endif
+                                            const SinkMetadata& sinkMetadata,
+                                            openInputStream_cb _hidl_cb) {
+    return mDevice->openInputStream(ioHandle, device, config, flags, sinkMetadata, _hidl_cb);
+}
+#endif
+
+Return<bool> PrimaryDevice::supportsAudioPatches() {
+    return mDevice->supportsAudioPatches();
+}
+
+Return<void> PrimaryDevice::createAudioPatch(const hidl_vec<AudioPortConfig>& sources,
+                                             const hidl_vec<AudioPortConfig>& sinks,
+                                             createAudioPatch_cb _hidl_cb) {
+    return mDevice->createAudioPatch(sources, sinks, _hidl_cb);
+}
+
+Return<Result> PrimaryDevice::releaseAudioPatch(int32_t patch) {
+    return mDevice->releaseAudioPatch(patch);
+}
+
+Return<void> PrimaryDevice::getAudioPort(const AudioPort& port, getAudioPort_cb _hidl_cb) {
+    return mDevice->getAudioPort(port, _hidl_cb);
+}
+
+Return<Result> PrimaryDevice::setAudioPortConfig(const AudioPortConfig& config) {
+    return mDevice->setAudioPortConfig(config);
+}
+
+Return<Result> PrimaryDevice::setScreenState(bool turnedOn) {
+    return mDevice->setScreenState(turnedOn);
+}
+
+#if MAJOR_VERSION == 2
+Return<AudioHwSync> PrimaryDevice::getHwAvSync() {
+    return mDevice->getHwAvSync();
+}
+
+Return<void> PrimaryDevice::getParameters(const hidl_vec<hidl_string>& keys,
+                                          getParameters_cb _hidl_cb) {
+    return mDevice->getParameters(keys, _hidl_cb);
+}
+
+Return<Result> PrimaryDevice::setParameters(const hidl_vec<ParameterValue>& parameters) {
+    return mDevice->setParameters(parameters);
+}
+
+Return<void> PrimaryDevice::debugDump(const hidl_handle& fd) {
+    return mDevice->debugDump(fd);
+}
+#elif MAJOR_VERSION >= 4
+Return<void> PrimaryDevice::getHwAvSync(getHwAvSync_cb _hidl_cb) {
+    return mDevice->getHwAvSync(_hidl_cb);
+}
+Return<void> PrimaryDevice::getParameters(const hidl_vec<ParameterValue>& context,
+                                          const hidl_vec<hidl_string>& keys,
+                                          getParameters_cb _hidl_cb) {
+    return mDevice->getParameters(context, keys, _hidl_cb);
+}
+Return<Result> PrimaryDevice::setParameters(const hidl_vec<ParameterValue>& context,
+                                            const hidl_vec<ParameterValue>& parameters) {
+    return mDevice->setParameters(context, parameters);
+}
+Return<void> PrimaryDevice::getMicrophones(getMicrophones_cb _hidl_cb) {
+    return mDevice->getMicrophones(_hidl_cb);
+}
+Return<Result> PrimaryDevice::setConnectedState(const DeviceAddress& address, bool connected) {
+    return mDevice->setConnectedState(address, connected);
+}
+#endif
+#if MAJOR_VERSION >= 6
+Return<Result> PrimaryDevice::close() {
+    return mDevice->close();
+}
+
+Return<Result> PrimaryDevice::addDeviceEffect(AudioPortHandle device, uint64_t effectId) {
+    return mDevice->addDeviceEffect(device, effectId);
+}
+
+Return<Result> PrimaryDevice::removeDeviceEffect(AudioPortHandle device, uint64_t effectId) {
+    return mDevice->removeDeviceEffect(device, effectId);
+}
+
+Return<void> PrimaryDevice::updateAudioPatch(int32_t previousPatch,
+                                             const hidl_vec<AudioPortConfig>& sources,
+                                             const hidl_vec<AudioPortConfig>& sinks,
+                                             updateAudioPatch_cb _hidl_cb) {
+    return mDevice->updateAudioPatch(previousPatch, sources, sinks, _hidl_cb);
+}
+#endif
+
+// Methods from ::android::hardware::audio::CPP_VERSION::IPrimaryDevice follow.
+Return<Result> PrimaryDevice::setVoiceVolume(float volume) {
+    if (!util::isGainNormalized(volume)) {
+        ALOGW("Can not set a voice volume (%f) outside [0,1]", volume);
+        return Result::INVALID_ARGUMENTS;
+    }
+    return mDevice->analyzeStatus("set_voice_volume",
+                                  mDevice->device()->set_voice_volume(mDevice->device(), volume));
+}
+
+Return<Result> PrimaryDevice::setMode(AudioMode mode) {
+    // INVALID, CURRENT, CNT, MAX are reserved for internal use.
+    // TODO: remove the values from the HIDL interface
+    switch (mode) {
+        case AudioMode::NORMAL:
+        case AudioMode::RINGTONE:
+        case AudioMode::IN_CALL:
+        case AudioMode::IN_COMMUNICATION:
+#if MAJOR_VERSION >= 6
+        case AudioMode::CALL_SCREEN:
+#endif
+            break;  // Valid values
+        default:
+            return Result::INVALID_ARGUMENTS;
+    };
+
+    return mDevice->analyzeStatus(
+        "set_mode",
+        mDevice->device()->set_mode(mDevice->device(), static_cast<audio_mode_t>(mode)));
+}
+
+Return<void> PrimaryDevice::getBtScoNrecEnabled(getBtScoNrecEnabled_cb _hidl_cb) {
+    bool enabled;
+    Result retval = mDevice->getParam(AudioParameter::keyBtNrec, &enabled);
+    _hidl_cb(retval, enabled);
+    return Void();
+}
+
+Return<Result> PrimaryDevice::setBtScoNrecEnabled(bool enabled) {
+    return mDevice->setParam(AudioParameter::keyBtNrec, enabled);
+}
+
+Return<void> PrimaryDevice::getBtScoWidebandEnabled(getBtScoWidebandEnabled_cb _hidl_cb) {
+    bool enabled;
+    Result retval = mDevice->getParam(AUDIO_PARAMETER_KEY_BT_SCO_WB, &enabled);
+    _hidl_cb(retval, enabled);
+    return Void();
+}
+
+Return<Result> PrimaryDevice::setBtScoWidebandEnabled(bool enabled) {
+    return mDevice->setParam(AUDIO_PARAMETER_KEY_BT_SCO_WB, enabled);
+}
+
+static const char* convertTtyModeFromHIDL(IPrimaryDevice::TtyMode mode) {
+    switch (mode) {
+        case IPrimaryDevice::TtyMode::OFF:
+            return AUDIO_PARAMETER_VALUE_TTY_OFF;
+        case IPrimaryDevice::TtyMode::VCO:
+            return AUDIO_PARAMETER_VALUE_TTY_VCO;
+        case IPrimaryDevice::TtyMode::HCO:
+            return AUDIO_PARAMETER_VALUE_TTY_HCO;
+        case IPrimaryDevice::TtyMode::FULL:
+            return AUDIO_PARAMETER_VALUE_TTY_FULL;
+        default:
+            return nullptr;
+    }
+}
+static IPrimaryDevice::TtyMode convertTtyModeToHIDL(const char* halMode) {
+    if (strcmp(halMode, AUDIO_PARAMETER_VALUE_TTY_OFF) == 0)
+        return IPrimaryDevice::TtyMode::OFF;
+    else if (strcmp(halMode, AUDIO_PARAMETER_VALUE_TTY_VCO) == 0)
+        return IPrimaryDevice::TtyMode::VCO;
+    else if (strcmp(halMode, AUDIO_PARAMETER_VALUE_TTY_HCO) == 0)
+        return IPrimaryDevice::TtyMode::HCO;
+    else if (strcmp(halMode, AUDIO_PARAMETER_VALUE_TTY_FULL) == 0)
+        return IPrimaryDevice::TtyMode::FULL;
+    return IPrimaryDevice::TtyMode(-1);
+}
+
+Return<void> PrimaryDevice::getTtyMode(getTtyMode_cb _hidl_cb) {
+    String8 halMode;
+    Result retval = mDevice->getParam(AUDIO_PARAMETER_KEY_TTY_MODE, &halMode);
+    if (retval != Result::OK) {
+        _hidl_cb(retval, TtyMode::OFF);
+        return Void();
+    }
+    TtyMode mode = convertTtyModeToHIDL(halMode);
+    if (mode == TtyMode(-1)) {
+        ALOGE("HAL returned invalid TTY value: %s", halMode.c_str());
+        _hidl_cb(Result::INVALID_STATE, TtyMode::OFF);
+        return Void();
+    }
+    _hidl_cb(Result::OK, mode);
+    return Void();
+}
+
+Return<Result> PrimaryDevice::setTtyMode(IPrimaryDevice::TtyMode mode) {
+    const char* modeStr = convertTtyModeFromHIDL(mode);
+    if (modeStr == nullptr) {
+        ALOGW("Can not set an invalid TTY value: %d", mode);
+        return Result::INVALID_ARGUMENTS;
+    }
+    return mDevice->setParam(AUDIO_PARAMETER_KEY_TTY_MODE, modeStr);
+}
+
+Return<void> PrimaryDevice::getHacEnabled(getHacEnabled_cb _hidl_cb) {
+    bool enabled;
+    Result retval = mDevice->getParam(AUDIO_PARAMETER_KEY_HAC, &enabled);
+    _hidl_cb(retval, enabled);
+    return Void();
+}
+
+Return<Result> PrimaryDevice::setHacEnabled(bool enabled) {
+    return mDevice->setParam(AUDIO_PARAMETER_KEY_HAC, enabled);
+}
+
+#if MAJOR_VERSION >= 4
+Return<Result> PrimaryDevice::setBtScoHeadsetDebugName(const hidl_string& name) {
+    return mDevice->setParam(AUDIO_PARAMETER_KEY_BT_SCO_HEADSET_NAME, name.c_str());
+}
+Return<void> PrimaryDevice::getBtHfpEnabled(getBtHfpEnabled_cb _hidl_cb) {
+    bool enabled;
+    Result retval = mDevice->getParam(AUDIO_PARAMETER_KEY_HFP_ENABLE, &enabled);
+    _hidl_cb(retval, enabled);
+    return Void();
+}
+Return<Result> PrimaryDevice::setBtHfpEnabled(bool enabled) {
+    return mDevice->setParam(AUDIO_PARAMETER_KEY_HFP_ENABLE, enabled);
+}
+Return<Result> PrimaryDevice::setBtHfpSampleRate(uint32_t sampleRateHz) {
+    return mDevice->setParam(AUDIO_PARAMETER_KEY_HFP_SET_SAMPLING_RATE, int(sampleRateHz));
+}
+Return<Result> PrimaryDevice::setBtHfpVolume(float volume) {
+    if (!util::isGainNormalized(volume)) {
+        ALOGW("Can not set BT HFP volume (%f) outside [0,1]", volume);
+        return Result::INVALID_ARGUMENTS;
+    }
+    // Map the normalized volume onto the range of [0, 15]
+    return mDevice->setParam(AUDIO_PARAMETER_KEY_HFP_VOLUME,
+                             static_cast<int>(std::round(volume * 15)));
+}
+Return<Result> PrimaryDevice::updateRotation(IPrimaryDevice::Rotation rotation) {
+    // legacy API expects the rotation in degree
+    return mDevice->setParam(AUDIO_PARAMETER_KEY_ROTATION, int(rotation) * 90);
+}
+#endif
+
+Return<void> PrimaryDevice::debug(const hidl_handle& fd, const hidl_vec<hidl_string>& options) {
+    return mDevice->debug(fd, options);
+}
+
+}  // namespace implementation
+}  // namespace CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android

audio/hal/PrimaryDevice.h

@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_AUDIO_PRIMARYDEVICE_H
+#define ANDROID_HARDWARE_AUDIO_PRIMARYDEVICE_H
+
+#include PATH(android/hardware/audio/FILE_VERSION/IPrimaryDevice.h)
+
+#include "Device.h"
+
+#include <hidl/Status.h>
+
+#include <hidl/MQDescriptor.h>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CPP_VERSION {
+namespace implementation {
+
+using ::android::sp;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using namespace ::android::hardware::audio::common::COMMON_TYPES_CPP_VERSION;
+using namespace ::android::hardware::audio::CORE_TYPES_CPP_VERSION;
+using namespace ::android::hardware::audio::CPP_VERSION;
+
+struct PrimaryDevice : public IPrimaryDevice {
+    explicit PrimaryDevice(audio_hw_device_t* device);
+
+    // Methods from ::android::hardware::audio::CPP_VERSION::IDevice follow.
+    Return<Result> initCheck() override;
+    Return<Result> setMasterVolume(float volume) override;
+    Return<void> getMasterVolume(getMasterVolume_cb _hidl_cb) override;
+    Return<Result> setMicMute(bool mute) override;
+    Return<void> getMicMute(getMicMute_cb _hidl_cb) override;
+    Return<Result> setMasterMute(bool mute) override;
+    Return<void> getMasterMute(getMasterMute_cb _hidl_cb) override;
+    Return<void> getInputBufferSize(const AudioConfig& config,
+                                    getInputBufferSize_cb _hidl_cb) override;
+
+    Return<void> openOutputStream(int32_t ioHandle, const DeviceAddress& device,
+                                  const AudioConfig& config,
+#if MAJOR_VERSION <= 6
+                                  AudioOutputFlags flags,
+#else
+                                  const AudioOutputFlags& flags,
+#endif
+#if MAJOR_VERSION >= 4
+                                  const SourceMetadata& sourceMetadata,
+#endif
+                                  openOutputStream_cb _hidl_cb) override;
+    Return<void> openInputStream(int32_t ioHandle, const DeviceAddress& device,
+                                 const AudioConfig& config,
+#if MAJOR_VERSION <= 6
+                                 AudioInputFlags flags,
+#else
+                                 const AudioInputFlags& flags,
+#endif
+#if MAJOR_VERSION == 2
+                                 AudioSource source,
+#elif MAJOR_VERSION >= 4
+                                 const SinkMetadata& sinkMetadata,
+#endif
+                                 openInputStream_cb _hidl_cb) override;
+
+    Return<bool> supportsAudioPatches() override;
+    Return<void> createAudioPatch(const hidl_vec<AudioPortConfig>& sources,
+                                  const hidl_vec<AudioPortConfig>& sinks,
+                                  createAudioPatch_cb _hidl_cb) override;
+    Return<Result> releaseAudioPatch(int32_t patch) override;
+    Return<void> getAudioPort(const AudioPort& port, getAudioPort_cb _hidl_cb) override;
+    Return<Result> setAudioPortConfig(const AudioPortConfig& config) override;
+
+    Return<Result> setScreenState(bool turnedOn) override;
+
+#if MAJOR_VERSION == 2
+    Return<AudioHwSync> getHwAvSync() override;
+    Return<void> getParameters(const hidl_vec<hidl_string>& keys,
+                               getParameters_cb _hidl_cb) override;
+    Return<Result> setParameters(const hidl_vec<ParameterValue>& parameters) override;
+    Return<void> debugDump(const hidl_handle& fd) override;
+#elif MAJOR_VERSION >= 4
+    Return<void> getHwAvSync(getHwAvSync_cb _hidl_cb) override;
+    Return<void> getParameters(const hidl_vec<ParameterValue>& context,
+                               const hidl_vec<hidl_string>& keys,
+                               getParameters_cb _hidl_cb) override;
+    Return<Result> setParameters(const hidl_vec<ParameterValue>& context,
+                                 const hidl_vec<ParameterValue>& parameters) override;
+    Return<void> getMicrophones(getMicrophones_cb _hidl_cb) override;
+    Return<Result> setConnectedState(const DeviceAddress& address, bool connected) override;
+#endif
+#if MAJOR_VERSION >= 6
+    Return<Result> close() override;
+    Return<Result> addDeviceEffect(AudioPortHandle device, uint64_t effectId) override;
+    Return<Result> removeDeviceEffect(AudioPortHandle device, uint64_t effectId) override;
+    Return<void> updateAudioPatch(int32_t previousPatch, const hidl_vec<AudioPortConfig>& sources,
+                                  const hidl_vec<AudioPortConfig>& sinks,
+                                  updateAudioPatch_cb _hidl_cb) override;
+#endif
+
+    Return<void> debug(const hidl_handle& fd, const hidl_vec<hidl_string>& options) override;
+
+    // Methods from ::android::hardware::audio::CPP_VERSION::IPrimaryDevice follow.
+    Return<Result> setVoiceVolume(float volume) override;
+    Return<Result> setMode(AudioMode mode) override;
+    Return<void> getBtScoNrecEnabled(getBtScoNrecEnabled_cb _hidl_cb) override;
+    Return<Result> setBtScoNrecEnabled(bool enabled) override;
+    Return<void> getBtScoWidebandEnabled(getBtScoWidebandEnabled_cb _hidl_cb) override;
+    Return<Result> setBtScoWidebandEnabled(bool enabled) override;
+    Return<void> getTtyMode(getTtyMode_cb _hidl_cb) override;
+    Return<Result> setTtyMode(IPrimaryDevice::TtyMode mode) override;
+    Return<void> getHacEnabled(getHacEnabled_cb _hidl_cb) override;
+    Return<Result> setHacEnabled(bool enabled) override;
+
+#if MAJOR_VERSION >= 4
+    Return<Result> setBtScoHeadsetDebugName(const hidl_string& name) override;
+    Return<void> getBtHfpEnabled(getBtHfpEnabled_cb _hidl_cb) override;
+    Return<Result> setBtHfpEnabled(bool enabled) override;
+    Return<Result> setBtHfpSampleRate(uint32_t sampleRateHz) override;
+    Return<Result> setBtHfpVolume(float volume) override;
+    Return<Result> updateRotation(IPrimaryDevice::Rotation rotation) override;
+#endif
+#if MAJOR_VERSION == 7 && MINOR_VERSION == 1
+    Return<sp<::android::hardware::audio::V7_1::IDevice>> getDevice() override { return mDevice; }
+#endif
+  private:
+    sp<Device> mDevice;
+
+    virtual ~PrimaryDevice();
+};
+
+}  // namespace implementation
+}  // namespace CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_AUDIO_PRIMARYDEVICE_H

audio/hal/Stream.cpp

@@ -0,0 +1,457 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "StreamHAL"
+
+#include "Stream.h"
+#include "common/all-versions/HidlSupport.h"
+#include "common/all-versions/default/EffectMap.h"
+#include "Util.h"
+
+#include <inttypes.h>
+
+#include <HidlUtils.h>
+#include <android/log.h>
+#include <hardware/audio.h>
+#include <hardware/audio_effect.h>
+#include <media/AudioContainers.h>
+#include <media/TypeConverter.h>
+#include <util/CoreUtils.h>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CPP_VERSION {
+namespace implementation {
+
+using ::android::hardware::audio::common::COMMON_TYPES_CPP_VERSION::implementation::HidlUtils;
+using ::android::hardware::audio::common::utils::splitString;
+using ::android::hardware::audio::CORE_TYPES_CPP_VERSION::implementation::CoreUtils;
+namespace util {
+using namespace ::android::hardware::audio::CORE_TYPES_CPP_VERSION::implementation::util;
+}
+
+Stream::Stream(bool isInput, audio_stream_t* stream) : mIsInput(isInput), mStream(stream) {
+    (void)mIsInput;  // prevent 'unused field' warnings in pre-V7 versions.
+}
+
+Stream::~Stream() {
+    mStream = nullptr;
+}
+
+// static
+Result Stream::analyzeStatus(const char* funcName, int status) {
+    return util::analyzeStatus("stream", funcName, status);
+}
+
+// static
+Result Stream::analyzeStatus(const char* funcName, int status,
+                             const std::vector<int>& ignoreErrors) {
+    return util::analyzeStatus("stream", funcName, status, ignoreErrors);
+}
+
+char* Stream::halGetParameters(const char* keys) {
+    return mStream->get_parameters(mStream, keys);
+}
+
+int Stream::halSetParameters(const char* keysAndValues) {
+    return mStream->set_parameters(mStream, keysAndValues);
+}
+
+// Methods from ::android::hardware::audio::CPP_VERSION::IStream follow.
+Return<uint64_t> Stream::getFrameSize() {
+    // Needs to be implemented by interface subclasses. But can't be declared as pure virtual,
+    // since interface subclasses implementation do not inherit from this class.
+    LOG_ALWAYS_FATAL("Stream::getFrameSize is pure abstract");
+    return uint64_t{};
+}
+
+Return<uint64_t> Stream::getFrameCount() {
+    int halFrameCount;
+    Result retval = getParam(AudioParameter::keyFrameCount, &halFrameCount);
+    return retval == Result::OK ? halFrameCount : 0;
+}
+
+Return<uint64_t> Stream::getBufferSize() {
+    return mStream->get_buffer_size(mStream);
+}
+
+#if MAJOR_VERSION <= 6
+Return<uint32_t> Stream::getSampleRate() {
+    return mStream->get_sample_rate(mStream);
+}
+
+#if MAJOR_VERSION == 2
+Return<void> Stream::getSupportedSampleRates(getSupportedSampleRates_cb _hidl_cb) {
+    return getSupportedSampleRates(getFormat(), _hidl_cb);
+}
+Return<void> Stream::getSupportedChannelMasks(getSupportedChannelMasks_cb _hidl_cb) {
+    return getSupportedChannelMasks(getFormat(), _hidl_cb);
+}
+#endif
+
+Return<void> Stream::getSupportedSampleRates(AudioFormat format,
+                                             getSupportedSampleRates_cb _hidl_cb) {
+    AudioParameter context;
+    context.addInt(String8(AUDIO_PARAMETER_STREAM_FORMAT), int(format));
+    String8 halListValue;
+    Result result =
+        getParam(AudioParameter::keyStreamSupportedSamplingRates, &halListValue, context);
+    hidl_vec<uint32_t> sampleRates;
+    SampleRateSet halSampleRates;
+    if (result == Result::OK) {
+        halSampleRates =
+            samplingRatesFromString(halListValue.string(), AudioParameter::valueListSeparator);
+        sampleRates = hidl_vec<uint32_t>(halSampleRates.begin(), halSampleRates.end());
+        // Legacy get_parameter does not return a status_t, thus can not advertise of failure.
+        // Note that this method must succeed (non empty list) if the format is supported.
+        if (sampleRates.size() == 0) {
+            result = Result::NOT_SUPPORTED;
+        }
+    }
+#if MAJOR_VERSION == 2
+    _hidl_cb(sampleRates);
+#elif MAJOR_VERSION >= 4
+    _hidl_cb(result, sampleRates);
+#endif
+    return Void();
+}
+
+Return<void> Stream::getSupportedChannelMasks(AudioFormat format,
+                                              getSupportedChannelMasks_cb _hidl_cb) {
+    AudioParameter context;
+    context.addInt(String8(AUDIO_PARAMETER_STREAM_FORMAT), int(format));
+    String8 halListValue;
+    Result result = getParam(AudioParameter::keyStreamSupportedChannels, &halListValue, context);
+    hidl_vec<AudioChannelBitfield> channelMasks;
+    ChannelMaskSet halChannelMasks;
+    if (result == Result::OK) {
+        halChannelMasks =
+            channelMasksFromString(halListValue.string(), AudioParameter::valueListSeparator);
+        channelMasks.resize(halChannelMasks.size());
+        size_t i = 0;
+        for (auto channelMask : halChannelMasks) {
+            channelMasks[i++] = AudioChannelBitfield(channelMask);
+        }
+        // Legacy get_parameter does not return a status_t, thus can not advertise of failure.
+        // Note that this method must succeed (non empty list) if the format is supported.
+        if (channelMasks.size() == 0) {
+            result = Result::NOT_SUPPORTED;
+        }
+    }
+#if MAJOR_VERSION == 2
+    _hidl_cb(channelMasks);
+#elif MAJOR_VERSION >= 4
+    _hidl_cb(result, channelMasks);
+#endif
+    return Void();
+}
+
+Return<Result> Stream::setSampleRate(uint32_t sampleRateHz) {
+    return setParam(AudioParameter::keySamplingRate, static_cast<int>(sampleRateHz));
+}
+
+Return<AudioChannelBitfield> Stream::getChannelMask() {
+    return AudioChannelBitfield(mStream->get_channels(mStream));
+}
+
+Return<Result> Stream::setChannelMask(AudioChannelBitfield mask) {
+    return setParam(AudioParameter::keyChannels, static_cast<int>(mask));
+}
+
+Return<AudioFormat> Stream::getFormat() {
+    return AudioFormat(mStream->get_format(mStream));
+}
+
+Return<void> Stream::getSupportedFormats(getSupportedFormats_cb _hidl_cb) {
+    String8 halListValue;
+    Result result = getParam(AudioParameter::keyStreamSupportedFormats, &halListValue);
+    hidl_vec<AudioFormat> formats;
+    FormatVector halFormats;
+    if (result == Result::OK) {
+        halFormats = formatsFromString(halListValue.string(), AudioParameter::valueListSeparator);
+        formats.resize(halFormats.size());
+        for (size_t i = 0; i < halFormats.size(); ++i) {
+            formats[i] = AudioFormat(halFormats[i]);
+        }
+        // Legacy get_parameter does not return a status_t, thus can not advertise of failure.
+        // Note that the method must not return an empty list if this capability is supported.
+        if (formats.size() == 0) {
+            result = Result::NOT_SUPPORTED;
+        }
+    }
+#if MAJOR_VERSION <= 5
+    _hidl_cb(formats);
+#elif MAJOR_VERSION >= 6
+    _hidl_cb(result, formats);
+#endif
+    return Void();
+}
+
+Return<Result> Stream::setFormat(AudioFormat format) {
+    return setParam(AudioParameter::keyFormat, static_cast<int>(format));
+}
+
+Return<void> Stream::getAudioProperties(getAudioProperties_cb _hidl_cb) {
+    uint32_t halSampleRate = mStream->get_sample_rate(mStream);
+    audio_channel_mask_t halMask = mStream->get_channels(mStream);
+    audio_format_t halFormat = mStream->get_format(mStream);
+    _hidl_cb(halSampleRate, AudioChannelBitfield(halMask), AudioFormat(halFormat));
+    return Void();
+}
+
+#else  // MAJOR_VERSION <= 6
+
+Return<void> Stream::getSupportedProfiles(getSupportedProfiles_cb _hidl_cb) {
+    String8 halListValue;
+    Result result = getParam(AudioParameter::keyStreamSupportedFormats, &halListValue);
+    hidl_vec<AudioProfile> profiles;
+    if (result != Result::OK) {
+        _hidl_cb(result, profiles);
+        return Void();
+    }
+    // Ensure that the separator is one character, despite that it's defined as a C string.
+    static_assert(sizeof(AUDIO_PARAMETER_VALUE_LIST_SEPARATOR) == 2);
+    std::vector<std::string> halFormats =
+            splitString(halListValue.string(), AUDIO_PARAMETER_VALUE_LIST_SEPARATOR[0]);
+    hidl_vec<AudioFormat> formats;
+    (void)HidlUtils::audioFormatsFromHal(halFormats, &formats);
+    std::vector<AudioProfile> tempProfiles;
+    for (const auto& format : formats) {
+        audio_format_t halFormat;
+        if (status_t status = HidlUtils::audioFormatToHal(format, &halFormat); status != NO_ERROR) {
+            continue;
+        }
+        AudioParameter context;
+        context.addInt(String8(AUDIO_PARAMETER_STREAM_FORMAT), int(halFormat));
+        // Query supported sample rates for the format.
+        result = getParam(AudioParameter::keyStreamSupportedSamplingRates, &halListValue, context);
+        if (result != Result::OK) break;
+        std::vector<std::string> halSampleRates =
+                splitString(halListValue.string(), AUDIO_PARAMETER_VALUE_LIST_SEPARATOR[0]);
+        hidl_vec<uint32_t> sampleRates;
+        sampleRates.resize(halSampleRates.size());
+        for (size_t i = 0; i < sampleRates.size(); ++i) {
+            sampleRates[i] = std::stoi(halSampleRates[i]);
+        }
+        // Query supported channel masks for the format.
+        result = getParam(AudioParameter::keyStreamSupportedChannels, &halListValue, context);
+        if (result != Result::OK) break;
+        std::vector<std::string> halChannelMasks =
+                splitString(halListValue.string(), AUDIO_PARAMETER_VALUE_LIST_SEPARATOR[0]);
+        hidl_vec<AudioChannelMask> channelMasks;
+        (void)HidlUtils::audioChannelMasksFromHal(halChannelMasks, &channelMasks);
+        // Create a profile.
+        if (channelMasks.size() != 0 && sampleRates.size() != 0) {
+            tempProfiles.push_back({.format = format,
+                                    .sampleRates = std::move(sampleRates),
+                                    .channelMasks = std::move(channelMasks)});
+        }
+    }
+    // Legacy get_parameter does not return a status_t, thus can not advertise of failure.
+    // Note that the method must not return an empty list if this capability is supported.
+    if (!tempProfiles.empty()) {
+        profiles = tempProfiles;
+    } else {
+        result = Result::NOT_SUPPORTED;
+    }
+    _hidl_cb(result, profiles);
+    return Void();
+}
+
+Return<void> Stream::getAudioProperties(getAudioProperties_cb _hidl_cb) {
+    audio_config_base_t halConfigBase = {mStream->get_sample_rate(mStream),
+                                         mStream->get_channels(mStream),
+                                         mStream->get_format(mStream)};
+    AudioConfigBase configBase = {};
+    status_t status = HidlUtils::audioConfigBaseFromHal(halConfigBase, mIsInput, &configBase);
+    _hidl_cb(Stream::analyzeStatus("get_audio_properties", status), configBase);
+    return Void();
+}
+
+Return<Result> Stream::setAudioProperties(const AudioConfigBaseOptional& config) {
+    audio_config_base_t halConfigBase = AUDIO_CONFIG_BASE_INITIALIZER;
+    bool formatSpecified, sRateSpecified, channelMaskSpecified;
+    status_t status = HidlUtils::audioConfigBaseOptionalToHal(
+            config, &halConfigBase, &formatSpecified, &sRateSpecified, &channelMaskSpecified);
+    if (status != NO_ERROR) {
+        return Stream::analyzeStatus("set_audio_properties", status);
+    }
+    if (sRateSpecified) {
+        if (Result result = setParam(AudioParameter::keySamplingRate,
+                                     static_cast<int>(halConfigBase.sample_rate));
+            result != Result::OK) {
+            return result;
+        }
+    }
+    if (channelMaskSpecified) {
+        if (Result result = setParam(AudioParameter::keyChannels,
+                                     static_cast<int>(halConfigBase.channel_mask));
+            result != Result::OK) {
+            return result;
+        }
+    }
+    if (formatSpecified) {
+        if (Result result =
+                    setParam(AudioParameter::keyFormat, static_cast<int>(halConfigBase.format));
+            result != Result::OK) {
+            return result;
+        }
+    }
+    return Result::OK;
+}
+
+#endif  // MAJOR_VERSION <= 6
+
+Return<Result> Stream::addEffect(uint64_t effectId) {
+    effect_handle_t halEffect = EffectMap::getInstance().get(effectId);
+    if (halEffect != NULL) {
+        return analyzeStatus("add_audio_effect", mStream->add_audio_effect(mStream, halEffect));
+    } else {
+        ALOGW("Invalid effect ID passed from client: %" PRIu64, effectId);
+        return Result::INVALID_ARGUMENTS;
+    }
+}
+
+Return<Result> Stream::removeEffect(uint64_t effectId) {
+    effect_handle_t halEffect = EffectMap::getInstance().get(effectId);
+    if (halEffect != NULL) {
+        return analyzeStatus("remove_audio_effect",
+                             mStream->remove_audio_effect(mStream, halEffect));
+    } else {
+        ALOGW("Invalid effect ID passed from client: %" PRIu64, effectId);
+        return Result::INVALID_ARGUMENTS;
+    }
+}
+
+Return<Result> Stream::standby() {
+    return analyzeStatus("standby", mStream->standby(mStream));
+}
+
+Return<Result> Stream::setHwAvSync(uint32_t hwAvSync) {
+    return setParam(AudioParameter::keyStreamHwAvSync, static_cast<int>(hwAvSync));
+}
+
+#if MAJOR_VERSION == 2
+Return<AudioDevice> Stream::getDevice() {
+    int device = 0;
+    Result retval = getParam(AudioParameter::keyRouting, &device);
+    return retval == Result::OK ? static_cast<AudioDevice>(device) : AudioDevice::NONE;
+}
+
+Return<Result> Stream::setDevice(const DeviceAddress& address) {
+    return setParam(AudioParameter::keyRouting, address);
+}
+
+Return<void> Stream::getParameters(const hidl_vec<hidl_string>& keys, getParameters_cb _hidl_cb) {
+    getParametersImpl({} /* context */, keys, _hidl_cb);
+    return Void();
+}
+
+Return<Result> Stream::setParameters(const hidl_vec<ParameterValue>& parameters) {
+    return setParametersImpl({} /* context */, parameters);
+}
+
+Return<Result> Stream::setConnectedState(const DeviceAddress& address, bool connected) {
+    return setParam(
+            connected ? AudioParameter::keyDeviceConnect : AudioParameter::keyDeviceDisconnect,
+            address);
+}
+#elif MAJOR_VERSION >= 4
+Return<void> Stream::getDevices(getDevices_cb _hidl_cb) {
+    int halDevice = 0;
+    Result retval = getParam(AudioParameter::keyRouting, &halDevice);
+    hidl_vec<DeviceAddress> devices;
+    if (retval == Result::OK) {
+        devices.resize(1);
+        retval = Stream::analyzeStatus(
+                "get_devices",
+                CoreUtils::deviceAddressFromHal(static_cast<audio_devices_t>(halDevice), nullptr,
+                                                &devices[0]));
+    }
+    _hidl_cb(retval, devices);
+    return Void();
+}
+
+Return<Result> Stream::setDevices(const hidl_vec<DeviceAddress>& devices) {
+    // FIXME: can the legacy API set multiple device with address ?
+    if (devices.size() > 1) {
+        return Result::NOT_SUPPORTED;
+    }
+    DeviceAddress address{};
+    if (devices.size() == 1) {
+        address = devices[0];
+    }
+    return setParam(AudioParameter::keyRouting, address);
+}
+
+Return<void> Stream::getParameters(const hidl_vec<ParameterValue>& context,
+                                   const hidl_vec<hidl_string>& keys, getParameters_cb _hidl_cb) {
+    getParametersImpl(context, keys, _hidl_cb);
+    return Void();
+}
+
+Return<Result> Stream::setParameters(const hidl_vec<ParameterValue>& context,
+                                     const hidl_vec<ParameterValue>& parameters) {
+    return setParametersImpl(context, parameters);
+}
+#endif
+
+Return<Result> Stream::start() {
+    return Result::NOT_SUPPORTED;
+}
+
+Return<Result> Stream::stop() {
+    return Result::NOT_SUPPORTED;
+}
+
+Return<void> Stream::createMmapBuffer(int32_t minSizeFrames __unused,
+                                      createMmapBuffer_cb _hidl_cb) {
+    Result retval(Result::NOT_SUPPORTED);
+    MmapBufferInfo info;
+    _hidl_cb(retval, info);
+    return Void();
+}
+
+Return<void> Stream::getMmapPosition(getMmapPosition_cb _hidl_cb) {
+    Result retval(Result::NOT_SUPPORTED);
+    MmapPosition position;
+    _hidl_cb(retval, position);
+    return Void();
+}
+
+Return<Result> Stream::close() {
+    return Result::NOT_SUPPORTED;
+}
+
+Return<void> Stream::debug(const hidl_handle& fd, const hidl_vec<hidl_string>& /* options */) {
+    if (fd.getNativeHandle() != nullptr && fd->numFds == 1) {
+        analyzeStatus("dump", mStream->dump(mStream, fd->data[0]));
+    }
+    return Void();
+}
+
+#if MAJOR_VERSION == 2
+Return<void> Stream::debugDump(const hidl_handle& fd) {
+    return debug(fd, {} /* options */);
+}
+#endif
+
+}  // namespace implementation
+}  // namespace CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android

audio/hal/Stream.h

@@ -0,0 +1,236 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_AUDIO_STREAM_H
+#define ANDROID_HARDWARE_AUDIO_STREAM_H
+
+// clang-format off
+#include PATH(android/hardware/audio/COMMON_TYPES_FILE_VERSION/IStream.h)
+// clang-format on
+
+#include "ParametersUtil.h"
+
+#include <vector>
+
+#include <hardware/audio.h>
+#include <hidl/Status.h>
+
+#include <hidl/MQDescriptor.h>
+
+#include <VersionUtils.h>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CPP_VERSION {
+namespace implementation {
+
+using ::android::sp;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::hardware::audio::CORE_TYPES_CPP_VERSION::implementation::ParametersUtil;
+#if MAJOR_VERSION <= 6
+using ::android::hardware::audio::common::COMMON_TYPES_CPP_VERSION::implementation::
+        AudioChannelBitfield;
+#endif
+using namespace ::android::hardware::audio::common::COMMON_TYPES_CPP_VERSION;
+using namespace ::android::hardware::audio::CORE_TYPES_CPP_VERSION;
+using namespace ::android::hardware::audio::CPP_VERSION;
+
+struct Stream : public IStream, public ParametersUtil {
+    Stream(bool isInput, audio_stream_t* stream);
+
+    /** 1GiB is the maximum buffer size the HAL client is allowed to request.
+     * This value has been chosen to be under SIZE_MAX and still big enough
+     * for all audio use case.
+     * Keep private for 2.0, put in .hal in 2.1
+     */
+    static constexpr uint32_t MAX_BUFFER_SIZE = 2 << 30 /* == 1GiB */;
+
+    // Methods from ::android::hardware::audio::CPP_VERSION::IStream follow.
+    Return<uint64_t> getFrameSize() override;
+    Return<uint64_t> getFrameCount() override;
+    Return<uint64_t> getBufferSize() override;
+#if MAJOR_VERSION <= 6
+    Return<uint32_t> getSampleRate() override;
+#if MAJOR_VERSION == 2
+    Return<void> getSupportedSampleRates(getSupportedSampleRates_cb _hidl_cb) override;
+    Return<void> getSupportedChannelMasks(getSupportedChannelMasks_cb _hidl_cb) override;
+#endif
+    Return<void> getSupportedSampleRates(AudioFormat format, getSupportedSampleRates_cb _hidl_cb);
+    Return<void> getSupportedChannelMasks(AudioFormat format, getSupportedChannelMasks_cb _hidl_cb);
+    Return<Result> setSampleRate(uint32_t sampleRateHz) override;
+    Return<AudioChannelBitfield> getChannelMask() override;
+    Return<Result> setChannelMask(AudioChannelBitfield mask) override;
+    Return<AudioFormat> getFormat() override;
+    Return<void> getSupportedFormats(getSupportedFormats_cb _hidl_cb) override;
+    Return<Result> setFormat(AudioFormat format) override;
+#else
+    Return<void> getSupportedProfiles(getSupportedProfiles_cb _hidl_cb) override;
+    Return<Result> setAudioProperties(const AudioConfigBaseOptional& config) override;
+#endif  // MAJOR_VERSION <= 6
+    Return<void> getAudioProperties(getAudioProperties_cb _hidl_cb) override;
+    Return<Result> addEffect(uint64_t effectId) override;
+    Return<Result> removeEffect(uint64_t effectId) override;
+    Return<Result> standby() override;
+#if MAJOR_VERSION == 2
+    Return<AudioDevice> getDevice() override;
+    Return<Result> setDevice(const DeviceAddress& address) override;
+    Return<void> getParameters(const hidl_vec<hidl_string>& keys,
+                               getParameters_cb _hidl_cb) override;
+    Return<Result> setParameters(const hidl_vec<ParameterValue>& parameters) override;
+    Return<Result> setConnectedState(const DeviceAddress& address, bool connected) override;
+#elif MAJOR_VERSION >= 4
+    Return<void> getDevices(getDevices_cb _hidl_cb) override;
+    Return<Result> setDevices(const hidl_vec<DeviceAddress>& devices) override;
+    Return<void> getParameters(const hidl_vec<ParameterValue>& context,
+                               const hidl_vec<hidl_string>& keys,
+                               getParameters_cb _hidl_cb) override;
+    Return<Result> setParameters(const hidl_vec<ParameterValue>& context,
+                                 const hidl_vec<ParameterValue>& parameters) override;
+#endif
+    Return<Result> setHwAvSync(uint32_t hwAvSync) override;
+    Return<Result> start() override;
+    Return<Result> stop() override;
+    Return<void> createMmapBuffer(int32_t minSizeFrames, createMmapBuffer_cb _hidl_cb) override;
+    Return<void> getMmapPosition(getMmapPosition_cb _hidl_cb) override;
+    Return<Result> close() override;
+
+    Return<void> debug(const hidl_handle& fd, const hidl_vec<hidl_string>& options) override;
+#if MAJOR_VERSION == 2
+    Return<void> debugDump(const hidl_handle& fd) override;
+#endif
+
+    // Utility methods for extending interfaces.
+    static Result analyzeStatus(const char* funcName, int status);
+    static Result analyzeStatus(const char* funcName, int status,
+                                const std::vector<int>& ignoreErrors);
+
+   private:
+     const bool mIsInput;
+     audio_stream_t* mStream;
+
+     virtual ~Stream();
+
+     // Methods from ParametersUtil.
+     char* halGetParameters(const char* keys) override;
+     int halSetParameters(const char* keysAndValues) override;
+};
+
+template <typename T>
+struct StreamMmap : public RefBase {
+    explicit StreamMmap(T* stream) : mStream(stream) {}
+
+    Return<Result> start();
+    Return<Result> stop();
+    Return<void> createMmapBuffer(int32_t minSizeFrames, size_t frameSize,
+                                  IStream::createMmapBuffer_cb _hidl_cb);
+    Return<void> getMmapPosition(IStream::getMmapPosition_cb _hidl_cb);
+
+   private:
+    StreamMmap() {}
+
+    T* mStream;
+};
+
+template <typename T>
+Return<Result> StreamMmap<T>::start() {
+    if (mStream->start == NULL) return Result::NOT_SUPPORTED;
+    int result = mStream->start(mStream);
+    return Stream::analyzeStatus("start", result);
+}
+
+template <typename T>
+Return<Result> StreamMmap<T>::stop() {
+    if (mStream->stop == NULL) return Result::NOT_SUPPORTED;
+    int result = mStream->stop(mStream);
+    return Stream::analyzeStatus("stop", result);
+}
+
+template <typename T>
+Return<void> StreamMmap<T>::createMmapBuffer(int32_t minSizeFrames, size_t frameSize,
+                                             IStream::createMmapBuffer_cb _hidl_cb) {
+    Result retval(Result::NOT_SUPPORTED);
+    MmapBufferInfo info;
+    native_handle_t* hidlHandle = nullptr;
+
+    if (mStream->create_mmap_buffer != NULL) {
+        if (minSizeFrames <= 0) {
+            retval = Result::INVALID_ARGUMENTS;
+            goto exit;
+        }
+        struct audio_mmap_buffer_info halInfo;
+        retval = Stream::analyzeStatus(
+            "create_mmap_buffer", mStream->create_mmap_buffer(mStream, minSizeFrames, &halInfo));
+        if (retval == Result::OK) {
+            hidlHandle = native_handle_create(1, 0);
+            hidlHandle->data[0] = halInfo.shared_memory_fd;
+
+            // Negative buffer size frame is a legacy hack to indicate that the buffer
+            // is shareable to applications before the relevant flag was introduced
+            bool applicationShareable =
+                halInfo.flags & AUDIO_MMAP_APPLICATION_SHAREABLE || halInfo.buffer_size_frames < 0;
+            halInfo.buffer_size_frames = abs(halInfo.buffer_size_frames);
+            info.sharedMemory =  // hidl_memory size must always be positive
+                hidl_memory("audio_buffer", hidlHandle, frameSize * halInfo.buffer_size_frames);
+#if MAJOR_VERSION == 2
+            if (applicationShareable) {
+                halInfo.buffer_size_frames *= -1;
+            }
+#else
+            info.flags =
+                halInfo.flags | (applicationShareable ? MmapBufferFlag::APPLICATION_SHAREABLE
+                                                      : MmapBufferFlag::NONE);
+#endif
+            info.bufferSizeFrames = halInfo.buffer_size_frames;
+            info.burstSizeFrames = halInfo.burst_size_frames;
+        }
+    }
+exit:
+    _hidl_cb(retval, info);
+    if (hidlHandle != nullptr) {
+        native_handle_delete(hidlHandle);
+    }
+    return Void();
+}
+
+template <typename T>
+Return<void> StreamMmap<T>::getMmapPosition(IStream::getMmapPosition_cb _hidl_cb) {
+    Result retval(Result::NOT_SUPPORTED);
+    MmapPosition position;
+
+    if (mStream->get_mmap_position != NULL) {
+        struct audio_mmap_position halPosition;
+        retval = Stream::analyzeStatus("get_mmap_position",
+                                       mStream->get_mmap_position(mStream, &halPosition));
+        if (retval == Result::OK) {
+            position.timeNanoseconds = halPosition.time_nanoseconds;
+            position.positionFrames = halPosition.position_frames;
+        }
+    }
+    _hidl_cb(retval, position);
+    return Void();
+}
+
+}  // namespace implementation
+}  // namespace CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_AUDIO_STREAM_H

audio/hal/StreamIn.cpp

@@ -0,0 +1,607 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "StreamInHAL"
+
+#include "StreamIn.h"
+#include "Util.h"
+#include "common/all-versions/HidlSupport.h"
+
+//#define LOG_NDEBUG 0
+#define ATRACE_TAG ATRACE_TAG_AUDIO
+
+#include <HidlUtils.h>
+#include <android/log.h>
+#include <hardware/audio.h>
+#include <util/CoreUtils.h>
+#include <utils/Trace.h>
+#include <cmath>
+#include <memory>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CPP_VERSION {
+namespace implementation {
+
+using ::android::hardware::audio::common::COMMON_TYPES_CPP_VERSION::implementation::HidlUtils;
+using ::android::hardware::audio::CORE_TYPES_CPP_VERSION::implementation::CoreUtils;
+namespace util {
+using namespace ::android::hardware::audio::CORE_TYPES_CPP_VERSION::implementation::util;
+}
+
+namespace {
+
+class ReadThread : public Thread {
+   public:
+    // ReadThread's lifespan never exceeds StreamIn's lifespan.
+    ReadThread(std::atomic<bool>* stop, audio_stream_in_t* stream, StreamIn::CommandMQ* commandMQ,
+               StreamIn::DataMQ* dataMQ, StreamIn::StatusMQ* statusMQ, EventFlag* efGroup)
+        : Thread(false /*canCallJava*/),
+          mStop(stop),
+          mStream(stream),
+          mCommandMQ(commandMQ),
+          mDataMQ(dataMQ),
+          mStatusMQ(statusMQ),
+          mEfGroup(efGroup),
+          mBuffer(nullptr) {}
+    bool init() {
+        mBuffer.reset(new (std::nothrow) uint8_t[mDataMQ->getQuantumCount()]);
+        return mBuffer != nullptr;
+    }
+    virtual ~ReadThread() {}
+
+   private:
+    std::atomic<bool>* mStop;
+    audio_stream_in_t* mStream;
+    StreamIn::CommandMQ* mCommandMQ;
+    StreamIn::DataMQ* mDataMQ;
+    StreamIn::StatusMQ* mStatusMQ;
+    EventFlag* mEfGroup;
+    std::unique_ptr<uint8_t[]> mBuffer;
+    IStreamIn::ReadParameters mParameters;
+    IStreamIn::ReadStatus mStatus;
+
+    bool threadLoop() override;
+
+    void doGetCapturePosition();
+    void doRead();
+};
+
+void ReadThread::doRead() {
+    size_t availableToWrite = mDataMQ->availableToWrite();
+    size_t requestedToRead = mParameters.params.read;
+    if (requestedToRead > availableToWrite) {
+        ALOGW(
+            "truncating read data from %d to %d due to insufficient data queue "
+            "space",
+            (int32_t)requestedToRead, (int32_t)availableToWrite);
+        requestedToRead = availableToWrite;
+    }
+    ssize_t readResult = mStream->read(mStream, &mBuffer[0], requestedToRead);
+    mStatus.retval = Result::OK;
+    if (readResult >= 0) {
+        mStatus.reply.read = readResult;
+        if (!mDataMQ->write(&mBuffer[0], readResult)) {
+            ALOGW("data message queue write failed");
+        }
+    } else {
+        mStatus.retval = Stream::analyzeStatus("read", readResult);
+    }
+}
+
+void ReadThread::doGetCapturePosition() {
+    mStatus.retval = StreamIn::getCapturePositionImpl(
+        mStream, &mStatus.reply.capturePosition.frames, &mStatus.reply.capturePosition.time);
+}
+
+bool ReadThread::threadLoop() {
+    // This implementation doesn't return control back to the Thread until it
+    // decides to stop,
+    // as the Thread uses mutexes, and this can lead to priority inversion.
+    while (!std::atomic_load_explicit(mStop, std::memory_order_acquire)) {
+        uint32_t efState = 0;
+        mEfGroup->wait(static_cast<uint32_t>(MessageQueueFlagBits::NOT_FULL), &efState);
+        if (!(efState & static_cast<uint32_t>(MessageQueueFlagBits::NOT_FULL))) {
+            continue;  // Nothing to do.
+        }
+        if (!mCommandMQ->read(&mParameters)) {
+            continue;  // Nothing to do.
+        }
+        mStatus.replyTo = mParameters.command;
+        switch (mParameters.command) {
+            case IStreamIn::ReadCommand::READ:
+                doRead();
+                break;
+            case IStreamIn::ReadCommand::GET_CAPTURE_POSITION:
+                doGetCapturePosition();
+                break;
+            default:
+                ALOGE("Unknown read thread command code %d", mParameters.command);
+                mStatus.retval = Result::NOT_SUPPORTED;
+                break;
+        }
+        if (!mStatusMQ->write(&mStatus)) {
+            ALOGW("status message queue write failed");
+        }
+        mEfGroup->wake(static_cast<uint32_t>(MessageQueueFlagBits::NOT_EMPTY));
+    }
+
+    return false;
+}
+
+}  // namespace
+
+StreamIn::StreamIn(const sp<Device>& device, audio_stream_in_t* stream)
+    : mDevice(device),
+      mStream(stream),
+      mStreamCommon(new Stream(true /*isInput*/, &stream->common)),
+      mStreamMmap(new StreamMmap<audio_stream_in_t>(stream)),
+      mEfGroup(nullptr),
+      mStopReadThread(false) {}
+
+StreamIn::~StreamIn() {
+    ATRACE_CALL();
+    close();
+    if (mReadThread.get()) {
+        ATRACE_NAME("mReadThread->join");
+        status_t status = mReadThread->join();
+        ALOGE_IF(status, "read thread exit error: %s", strerror(-status));
+    }
+    if (mEfGroup) {
+        status_t status = EventFlag::deleteEventFlag(&mEfGroup);
+        ALOGE_IF(status, "read MQ event flag deletion error: %s", strerror(-status));
+    }
+#if MAJOR_VERSION <= 5
+    mDevice->closeInputStream(mStream);
+#endif
+    mStream = nullptr;
+}
+
+// Methods from ::android::hardware::audio::CPP_VERSION::IStream follow.
+Return<uint64_t> StreamIn::getFrameSize() {
+    return audio_stream_in_frame_size(mStream);
+}
+
+Return<uint64_t> StreamIn::getFrameCount() {
+    return mStreamCommon->getFrameCount();
+}
+
+Return<uint64_t> StreamIn::getBufferSize() {
+    return mStreamCommon->getBufferSize();
+}
+
+#if MAJOR_VERSION <= 6
+Return<uint32_t> StreamIn::getSampleRate() {
+    return mStreamCommon->getSampleRate();
+}
+
+#if MAJOR_VERSION == 2
+Return<void> StreamIn::getSupportedChannelMasks(getSupportedChannelMasks_cb _hidl_cb) {
+    return mStreamCommon->getSupportedChannelMasks(_hidl_cb);
+}
+Return<void> StreamIn::getSupportedSampleRates(getSupportedSampleRates_cb _hidl_cb) {
+    return mStreamCommon->getSupportedSampleRates(_hidl_cb);
+}
+#endif
+
+Return<void> StreamIn::getSupportedChannelMasks(AudioFormat format,
+                                                getSupportedChannelMasks_cb _hidl_cb) {
+    return mStreamCommon->getSupportedChannelMasks(format, _hidl_cb);
+}
+Return<void> StreamIn::getSupportedSampleRates(AudioFormat format,
+                                               getSupportedSampleRates_cb _hidl_cb) {
+    return mStreamCommon->getSupportedSampleRates(format, _hidl_cb);
+}
+
+Return<Result> StreamIn::setSampleRate(uint32_t sampleRateHz) {
+    return mStreamCommon->setSampleRate(sampleRateHz);
+}
+
+Return<AudioChannelBitfield> StreamIn::getChannelMask() {
+    return mStreamCommon->getChannelMask();
+}
+
+Return<Result> StreamIn::setChannelMask(AudioChannelBitfield mask) {
+    return mStreamCommon->setChannelMask(mask);
+}
+
+Return<AudioFormat> StreamIn::getFormat() {
+    return mStreamCommon->getFormat();
+}
+
+Return<void> StreamIn::getSupportedFormats(getSupportedFormats_cb _hidl_cb) {
+    return mStreamCommon->getSupportedFormats(_hidl_cb);
+}
+
+Return<Result> StreamIn::setFormat(AudioFormat format) {
+    return mStreamCommon->setFormat(format);
+}
+
+#else
+
+Return<void> StreamIn::getSupportedProfiles(getSupportedProfiles_cb _hidl_cb) {
+    return mStreamCommon->getSupportedProfiles(_hidl_cb);
+}
+
+Return<Result> StreamIn::setAudioProperties(const AudioConfigBaseOptional& config) {
+    return mStreamCommon->setAudioProperties(config);
+}
+
+#endif  // MAJOR_VERSION <= 6
+
+Return<void> StreamIn::getAudioProperties(getAudioProperties_cb _hidl_cb) {
+    return mStreamCommon->getAudioProperties(_hidl_cb);
+}
+
+Return<Result> StreamIn::addEffect(uint64_t effectId) {
+    return mStreamCommon->addEffect(effectId);
+}
+
+Return<Result> StreamIn::removeEffect(uint64_t effectId) {
+    return mStreamCommon->removeEffect(effectId);
+}
+
+Return<Result> StreamIn::standby() {
+    return mStreamCommon->standby();
+}
+
+Return<Result> StreamIn::setHwAvSync(uint32_t hwAvSync) {
+    return mStreamCommon->setHwAvSync(hwAvSync);
+}
+
+#if MAJOR_VERSION == 2
+Return<Result> StreamIn::setConnectedState(const DeviceAddress& address, bool connected) {
+    return mStreamCommon->setConnectedState(address, connected);
+}
+
+Return<AudioDevice> StreamIn::getDevice() {
+    return mStreamCommon->getDevice();
+}
+
+Return<Result> StreamIn::setDevice(const DeviceAddress& address) {
+    return mStreamCommon->setDevice(address);
+}
+
+Return<void> StreamIn::getParameters(const hidl_vec<hidl_string>& keys, getParameters_cb _hidl_cb) {
+    return mStreamCommon->getParameters(keys, _hidl_cb);
+}
+
+Return<Result> StreamIn::setParameters(const hidl_vec<ParameterValue>& parameters) {
+    return mStreamCommon->setParameters(parameters);
+}
+
+Return<void> StreamIn::debugDump(const hidl_handle& fd) {
+    return mStreamCommon->debugDump(fd);
+}
+#elif MAJOR_VERSION >= 4
+Return<void> StreamIn::getDevices(getDevices_cb _hidl_cb) {
+    return mStreamCommon->getDevices(_hidl_cb);
+}
+
+Return<Result> StreamIn::setDevices(const hidl_vec<DeviceAddress>& devices) {
+    return mStreamCommon->setDevices(devices);
+}
+Return<void> StreamIn::getParameters(const hidl_vec<ParameterValue>& context,
+                                     const hidl_vec<hidl_string>& keys, getParameters_cb _hidl_cb) {
+    return mStreamCommon->getParameters(context, keys, _hidl_cb);
+}
+
+Return<Result> StreamIn::setParameters(const hidl_vec<ParameterValue>& context,
+                                       const hidl_vec<ParameterValue>& parameters) {
+    return mStreamCommon->setParameters(context, parameters);
+}
+#endif
+
+Return<Result> StreamIn::start() {
+    return mStreamMmap->start();
+}
+
+Return<Result> StreamIn::stop() {
+    return mStreamMmap->stop();
+}
+
+Return<void> StreamIn::createMmapBuffer(int32_t minSizeFrames, createMmapBuffer_cb _hidl_cb) {
+    return mStreamMmap->createMmapBuffer(minSizeFrames, audio_stream_in_frame_size(mStream),
+                                         _hidl_cb);
+}
+
+Return<void> StreamIn::getMmapPosition(getMmapPosition_cb _hidl_cb) {
+    return mStreamMmap->getMmapPosition(_hidl_cb);
+}
+
+Return<Result> StreamIn::close() {
+    if (mStopReadThread.load(std::memory_order_relaxed)) {  // only this thread writes
+        return Result::INVALID_STATE;
+    }
+    mStopReadThread.store(true, std::memory_order_release);
+    if (mEfGroup) {
+        mEfGroup->wake(static_cast<uint32_t>(MessageQueueFlagBits::NOT_FULL));
+    }
+#if MAJOR_VERSION >= 6
+    mDevice->closeInputStream(mStream);
+#endif
+    return Result::OK;
+}
+
+// Methods from ::android::hardware::audio::CPP_VERSION::IStreamIn follow.
+Return<void> StreamIn::getAudioSource(getAudioSource_cb _hidl_cb) {
+    int halSource;
+    Result retval = mStreamCommon->getParam(AudioParameter::keyInputSource, &halSource);
+    AudioSource source = {};
+    if (retval == Result::OK) {
+        retval = Stream::analyzeStatus(
+                "get_audio_source",
+                HidlUtils::audioSourceFromHal(static_cast<audio_source_t>(halSource), &source));
+    }
+    _hidl_cb(retval, source);
+    return Void();
+}
+
+Return<Result> StreamIn::setGain(float gain) {
+    if (!util::isGainNormalized(gain)) {
+        ALOGW("Can not set a stream input gain (%f) outside [0,1]", gain);
+        return Result::INVALID_ARGUMENTS;
+    }
+    return Stream::analyzeStatus("set_gain", mStream->set_gain(mStream, gain));
+}
+
+Return<void> StreamIn::prepareForReading(uint32_t frameSize, uint32_t framesCount,
+                                         prepareForReading_cb _hidl_cb) {
+    status_t status;
+#if MAJOR_VERSION <= 6
+    ThreadInfo threadInfo = {0, 0};
+#else
+    int32_t threadInfo = 0;
+#endif
+
+    // Wrap the _hidl_cb to return an error
+    auto sendError = [&threadInfo, &_hidl_cb](Result result) {
+        _hidl_cb(result, CommandMQ::Descriptor(), DataMQ::Descriptor(), StatusMQ::Descriptor(),
+                 threadInfo);
+    };
+
+    // Create message queues.
+    if (mDataMQ) {
+        ALOGE("the client attempts to call prepareForReading twice");
+        sendError(Result::INVALID_STATE);
+        return Void();
+    }
+    std::unique_ptr<CommandMQ> tempCommandMQ(new CommandMQ(1));
+
+    // Check frameSize and framesCount
+    if (frameSize == 0 || framesCount == 0) {
+        ALOGE("Null frameSize (%u) or framesCount (%u)", frameSize, framesCount);
+        sendError(Result::INVALID_ARGUMENTS);
+        return Void();
+    }
+
+    if (frameSize > Stream::MAX_BUFFER_SIZE / framesCount) {
+        ALOGE("Buffer too big: %u*%u bytes > MAX_BUFFER_SIZE (%u)", frameSize, framesCount,
+              Stream::MAX_BUFFER_SIZE);
+        sendError(Result::INVALID_ARGUMENTS);
+        return Void();
+    }
+    std::unique_ptr<DataMQ> tempDataMQ(new DataMQ(frameSize * framesCount, true /* EventFlag */));
+
+    std::unique_ptr<StatusMQ> tempStatusMQ(new StatusMQ(1));
+    if (!tempCommandMQ->isValid() || !tempDataMQ->isValid() || !tempStatusMQ->isValid()) {
+        ALOGE_IF(!tempCommandMQ->isValid(), "command MQ is invalid");
+        ALOGE_IF(!tempDataMQ->isValid(), "data MQ is invalid");
+        ALOGE_IF(!tempStatusMQ->isValid(), "status MQ is invalid");
+        sendError(Result::INVALID_ARGUMENTS);
+        return Void();
+    }
+    EventFlag* tempRawEfGroup{};
+    status = EventFlag::createEventFlag(tempDataMQ->getEventFlagWord(), &tempRawEfGroup);
+    std::unique_ptr<EventFlag, void (*)(EventFlag*)> tempElfGroup(
+        tempRawEfGroup, [](auto* ef) { EventFlag::deleteEventFlag(&ef); });
+    if (status != OK || !tempElfGroup) {
+        ALOGE("failed creating event flag for data MQ: %s", strerror(-status));
+        sendError(Result::INVALID_ARGUMENTS);
+        return Void();
+    }
+
+    // Create and launch the thread.
+    auto tempReadThread =
+            sp<ReadThread>::make(&mStopReadThread, mStream, tempCommandMQ.get(), tempDataMQ.get(),
+                                 tempStatusMQ.get(), tempElfGroup.get());
+    if (!tempReadThread->init()) {
+        ALOGW("failed to start reader thread: %s", strerror(-status));
+        sendError(Result::INVALID_ARGUMENTS);
+        return Void();
+    }
+    status = tempReadThread->run("reader", PRIORITY_URGENT_AUDIO);
+    if (status != OK) {
+        ALOGW("failed to start reader thread: %s", strerror(-status));
+        sendError(Result::INVALID_ARGUMENTS);
+        return Void();
+    }
+
+    mCommandMQ = std::move(tempCommandMQ);
+    mDataMQ = std::move(tempDataMQ);
+    mStatusMQ = std::move(tempStatusMQ);
+    mReadThread = tempReadThread;
+    mEfGroup = tempElfGroup.release();
+#if MAJOR_VERSION <= 6
+    threadInfo.pid = getpid();
+    threadInfo.tid = mReadThread->getTid();
+#else
+    threadInfo = mReadThread->getTid();
+#endif
+    _hidl_cb(Result::OK, *mCommandMQ->getDesc(), *mDataMQ->getDesc(), *mStatusMQ->getDesc(),
+             threadInfo);
+    return Void();
+}
+
+Return<uint32_t> StreamIn::getInputFramesLost() {
+    return mStream->get_input_frames_lost(mStream);
+}
+
+// static
+Result StreamIn::getCapturePositionImpl(audio_stream_in_t* stream, uint64_t* frames,
+                                        uint64_t* time) {
+    // HAL may have a stub function, always returning ENOSYS, don't
+    // spam the log in this case.
+    static const std::vector<int> ignoredErrors{ENOSYS};
+    Result retval(Result::NOT_SUPPORTED);
+    if (stream->get_capture_position == NULL) return retval;
+    int64_t halFrames, halTime;
+    retval = Stream::analyzeStatus("get_capture_position",
+                                   stream->get_capture_position(stream, &halFrames, &halTime),
+                                   ignoredErrors);
+    if (retval == Result::OK) {
+        *frames = halFrames;
+        *time = halTime;
+    }
+    return retval;
+};
+
+Return<void> StreamIn::getCapturePosition(getCapturePosition_cb _hidl_cb) {
+    uint64_t frames = 0, time = 0;
+    Result retval = getCapturePositionImpl(mStream, &frames, &time);
+    _hidl_cb(retval, frames, time);
+    return Void();
+}
+
+Return<void> StreamIn::debug(const hidl_handle& fd, const hidl_vec<hidl_string>& options) {
+    return mStreamCommon->debug(fd, options);
+}
+
+#if MAJOR_VERSION >= 4
+Result StreamIn::doUpdateSinkMetadata(const SinkMetadata& sinkMetadata) {
+    std::vector<record_track_metadata> halTracks;
+#if MAJOR_VERSION <= 6
+    (void)CoreUtils::sinkMetadataToHal(sinkMetadata, &halTracks);
+#else
+    // Validate whether a conversion to V7 is possible. This is needed
+    // to have a consistent behavior of the HAL regardless of the API
+    // version of the legacy HAL (and also to be consistent with openInputStream).
+    std::vector<record_track_metadata_v7> halTracksV7;
+    if (status_t status = CoreUtils::sinkMetadataToHalV7(
+                sinkMetadata, false /*ignoreNonVendorTags*/, &halTracksV7);
+        status == NO_ERROR) {
+        halTracks.reserve(halTracksV7.size());
+        for (auto metadata_v7 : halTracksV7) {
+            halTracks.push_back(std::move(metadata_v7.base));
+        }
+    } else {
+        return Stream::analyzeStatus("sinkMetadataToHal", status);
+    }
+#endif  // MAJOR_VERSION <= 6
+    const sink_metadata_t halMetadata = {
+        .track_count = halTracks.size(),
+        .tracks = halTracks.data(),
+    };
+    mStream->update_sink_metadata(mStream, &halMetadata);
+    return Result::OK;
+}
+
+#if MAJOR_VERSION >= 7
+Result StreamIn::doUpdateSinkMetadataV7(const SinkMetadata& sinkMetadata) {
+    std::vector<record_track_metadata_v7> halTracks;
+    if (status_t status = CoreUtils::sinkMetadataToHalV7(sinkMetadata,
+                                                         false /*ignoreNonVendorTags*/, &halTracks);
+        status != NO_ERROR) {
+        return Stream::analyzeStatus("sinkMetadataToHal", status);
+    }
+    const sink_metadata_v7_t halMetadata = {
+            .track_count = halTracks.size(),
+            .tracks = halTracks.data(),
+    };
+    mStream->update_sink_metadata_v7(mStream, &halMetadata);
+    return Result::OK;
+}
+#endif  //  MAJOR_VERSION >= 7
+
+#if MAJOR_VERSION <= 6
+Return<void> StreamIn::updateSinkMetadata(const SinkMetadata& sinkMetadata) {
+    if (mStream->update_sink_metadata == nullptr) {
+        return Void();  // not supported by the HAL
+    }
+    (void)doUpdateSinkMetadata(sinkMetadata);
+    return Void();
+}
+#elif MAJOR_VERSION >= 7
+Return<Result> StreamIn::updateSinkMetadata(const SinkMetadata& sinkMetadata) {
+    if (mDevice->version() < AUDIO_DEVICE_API_VERSION_3_2) {
+        if (mStream->update_sink_metadata == nullptr) {
+            return Result::NOT_SUPPORTED;
+        }
+        return doUpdateSinkMetadata(sinkMetadata);
+    } else {
+        if (mStream->update_sink_metadata_v7 == nullptr) {
+            return Result::NOT_SUPPORTED;
+        }
+        return doUpdateSinkMetadataV7(sinkMetadata);
+    }
+}
+#endif
+
+Return<void> StreamIn::getActiveMicrophones(getActiveMicrophones_cb _hidl_cb) {
+    Result retval = Result::NOT_SUPPORTED;
+    size_t actual_mics = AUDIO_MICROPHONE_MAX_COUNT;
+    audio_microphone_characteristic_t mic_array[AUDIO_MICROPHONE_MAX_COUNT];
+
+    hidl_vec<MicrophoneInfo> microphones;
+    if (mStream->get_active_microphones != NULL &&
+        mStream->get_active_microphones(mStream, &mic_array[0], &actual_mics) == 0) {
+        microphones.resize(actual_mics);
+        for (size_t i = 0; i < actual_mics; ++i) {
+            (void)CoreUtils::microphoneInfoFromHal(mic_array[i], &microphones[i]);
+        }
+        retval = Result::OK;
+    }
+
+    _hidl_cb(retval, microphones);
+    return Void();
+}
+#endif
+
+#if MAJOR_VERSION >= 5
+Return<Result> StreamIn::setMicrophoneDirection(MicrophoneDirection direction) {
+    if (mStream->set_microphone_direction == nullptr) {
+        return Result::NOT_SUPPORTED;
+    }
+    if (!common::utils::isValidHidlEnum(direction)) {
+        ALOGE("%s: Invalid direction %d", __func__, direction);
+        return Result::INVALID_ARGUMENTS;
+    }
+    return Stream::analyzeStatus(
+            "set_microphone_direction",
+            mStream->set_microphone_direction(
+                    mStream, static_cast<audio_microphone_direction_t>(direction)));
+}
+
+Return<Result> StreamIn::setMicrophoneFieldDimension(float zoom) {
+    if (mStream->set_microphone_field_dimension == nullptr) {
+        return Result::NOT_SUPPORTED;
+    }
+    if (std::isnan(zoom) || zoom < -1 || zoom > 1) {
+        ALOGE("%s: Invalid zoom %f", __func__, zoom);
+        return Result::INVALID_ARGUMENTS;
+    }
+    return Stream::analyzeStatus("set_microphone_field_dimension",
+                                 mStream->set_microphone_field_dimension(mStream, zoom));
+}
+
+#endif
+
+}  // namespace implementation
+}  // namespace CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android

audio/hal/StreamIn.h

@@ -0,0 +1,162 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_AUDIO_STREAMIN_H
+#define ANDROID_HARDWARE_AUDIO_STREAMIN_H
+
+// clang-format off
+#include PATH(android/hardware/audio/CORE_TYPES_FILE_VERSION/IStreamIn.h)
+// clang-format on
+
+#include "Device.h"
+#include "Stream.h"
+
+#include <atomic>
+#include <memory>
+
+#include <fmq/EventFlag.h>
+#include <fmq/MessageQueue.h>
+#include <hidl/MQDescriptor.h>
+#include <hidl/Status.h>
+#include <utils/Thread.h>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CPP_VERSION {
+namespace implementation {
+
+using ::android::sp;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using namespace ::android::hardware::audio::common::COMMON_TYPES_CPP_VERSION;
+using namespace ::android::hardware::audio::CORE_TYPES_CPP_VERSION;
+using namespace ::android::hardware::audio::CPP_VERSION;
+
+struct StreamIn : public IStreamIn {
+    typedef MessageQueue<ReadParameters, kSynchronizedReadWrite> CommandMQ;
+    typedef MessageQueue<uint8_t, kSynchronizedReadWrite> DataMQ;
+    typedef MessageQueue<ReadStatus, kSynchronizedReadWrite> StatusMQ;
+
+    StreamIn(const sp<Device>& device, audio_stream_in_t* stream);
+
+    // Methods from ::android::hardware::audio::CPP_VERSION::IStream follow.
+    Return<uint64_t> getFrameSize() override;
+    Return<uint64_t> getFrameCount() override;
+    Return<uint64_t> getBufferSize() override;
+#if MAJOR_VERSION <= 6
+    Return<uint32_t> getSampleRate() override;
+#if MAJOR_VERSION == 2
+    Return<void> getSupportedSampleRates(getSupportedSampleRates_cb _hidl_cb) override;
+    Return<void> getSupportedChannelMasks(getSupportedChannelMasks_cb _hidl_cb) override;
+#endif
+    Return<void> getSupportedSampleRates(AudioFormat format, getSupportedSampleRates_cb _hidl_cb);
+    Return<void> getSupportedChannelMasks(AudioFormat format, getSupportedChannelMasks_cb _hidl_cb);
+    Return<Result> setSampleRate(uint32_t sampleRateHz) override;
+    Return<AudioChannelBitfield> getChannelMask() override;
+    Return<Result> setChannelMask(AudioChannelBitfield mask) override;
+    Return<AudioFormat> getFormat() override;
+    Return<void> getSupportedFormats(getSupportedFormats_cb _hidl_cb) override;
+    Return<Result> setFormat(AudioFormat format) override;
+#else
+    Return<void> getSupportedProfiles(getSupportedProfiles_cb _hidl_cb) override;
+    Return<Result> setAudioProperties(const AudioConfigBaseOptional& config) override;
+#endif  // MAJOR_VERSION <= 6
+    Return<void> getAudioProperties(getAudioProperties_cb _hidl_cb) override;
+    Return<Result> addEffect(uint64_t effectId) override;
+    Return<Result> removeEffect(uint64_t effectId) override;
+    Return<Result> standby() override;
+#if MAJOR_VERSION == 2
+    Return<AudioDevice> getDevice() override;
+    Return<Result> setDevice(const DeviceAddress& address) override;
+    Return<void> getParameters(const hidl_vec<hidl_string>& keys,
+                               getParameters_cb _hidl_cb) override;
+    Return<Result> setParameters(const hidl_vec<ParameterValue>& parameters) override;
+    Return<Result> setConnectedState(const DeviceAddress& address, bool connected) override;
+#elif MAJOR_VERSION >= 4
+    Return<void> getDevices(getDevices_cb _hidl_cb) override;
+    Return<Result> setDevices(const hidl_vec<DeviceAddress>& devices) override;
+    Return<void> getParameters(const hidl_vec<ParameterValue>& context,
+                               const hidl_vec<hidl_string>& keys,
+                               getParameters_cb _hidl_cb) override;
+    Return<Result> setParameters(const hidl_vec<ParameterValue>& context,
+                                 const hidl_vec<ParameterValue>& parameters) override;
+#endif
+    Return<Result> setHwAvSync(uint32_t hwAvSync) override;
+    Return<Result> close() override;
+
+    Return<void> debug(const hidl_handle& fd, const hidl_vec<hidl_string>& options) override;
+#if MAJOR_VERSION == 2
+    Return<void> debugDump(const hidl_handle& fd) override;
+#endif
+
+    // Methods from ::android::hardware::audio::CPP_VERSION::IStreamIn follow.
+    Return<void> getAudioSource(getAudioSource_cb _hidl_cb) override;
+    Return<Result> setGain(float gain) override;
+    Return<void> prepareForReading(uint32_t frameSize, uint32_t framesCount,
+                                   prepareForReading_cb _hidl_cb) override;
+    Return<uint32_t> getInputFramesLost() override;
+    Return<void> getCapturePosition(getCapturePosition_cb _hidl_cb) override;
+    Return<Result> start() override;
+    Return<Result> stop() override;
+    Return<void> createMmapBuffer(int32_t minSizeFrames, createMmapBuffer_cb _hidl_cb) override;
+    Return<void> getMmapPosition(getMmapPosition_cb _hidl_cb) override;
+#if MAJOR_VERSION >= 4
+#if MAJOR_VERSION <= 6
+    Return<void> updateSinkMetadata(const SinkMetadata& sinkMetadata) override;
+#else
+    Return<Result> updateSinkMetadata(const SinkMetadata& sinkMetadata) override;
+#endif
+    Return<void> getActiveMicrophones(getActiveMicrophones_cb _hidl_cb) override;
+#endif  // MAJOR_VERSION >= 4
+#if MAJOR_VERSION >= 5
+    Return<Result> setMicrophoneDirection(MicrophoneDirection direction) override;
+    Return<Result> setMicrophoneFieldDimension(float zoom) override;
+#endif
+    static Result getCapturePositionImpl(audio_stream_in_t* stream, uint64_t* frames,
+                                         uint64_t* time);
+
+  private:
+#if MAJOR_VERSION >= 4
+    Result doUpdateSinkMetadata(const SinkMetadata& sinkMetadata);
+#if MAJOR_VERSION >= 7
+    Result doUpdateSinkMetadataV7(const SinkMetadata& sinkMetadata);
+#endif
+#endif  // MAJOR_VERSION >= 4
+
+    const sp<Device> mDevice;
+    audio_stream_in_t* mStream;
+    const sp<Stream> mStreamCommon;
+    const sp<StreamMmap<audio_stream_in_t>> mStreamMmap;
+    std::unique_ptr<CommandMQ> mCommandMQ;
+    std::unique_ptr<DataMQ> mDataMQ;
+    std::unique_ptr<StatusMQ> mStatusMQ;
+    EventFlag* mEfGroup;
+    std::atomic<bool> mStopReadThread;
+    sp<Thread> mReadThread;
+
+    virtual ~StreamIn();
+};
+
+}  // namespace implementation
+}  // namespace CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_AUDIO_STREAMIN_H

audio/hal/StreamOut.cpp

@@ -0,0 +1,837 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "StreamOutHAL"
+
+#include "StreamOut.h"
+#include "Util.h"
+
+//#define LOG_NDEBUG 0
+#define ATRACE_TAG ATRACE_TAG_AUDIO
+
+#include <string.h>
+
+#include <memory>
+
+#include <HidlUtils.h>
+#include <android/log.h>
+#include <audio_utils/Metadata.h>
+#include <hardware/audio.h>
+#include <util/CoreUtils.h>
+#include <utils/Trace.h>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CPP_VERSION {
+namespace implementation {
+
+using ::android::hardware::audio::common::COMMON_TYPES_CPP_VERSION::implementation::HidlUtils;
+using ::android::hardware::audio::CORE_TYPES_CPP_VERSION::implementation::CoreUtils;
+namespace util {
+using namespace ::android::hardware::audio::CORE_TYPES_CPP_VERSION::implementation::util;
+}
+
+namespace {
+
+class WriteThread : public Thread {
+   public:
+    // WriteThread's lifespan never exceeds StreamOut's lifespan.
+    WriteThread(std::atomic<bool>* stop, audio_stream_out_t* stream,
+                StreamOut::CommandMQ* commandMQ, StreamOut::DataMQ* dataMQ,
+                StreamOut::StatusMQ* statusMQ, EventFlag* efGroup)
+        : Thread(false /*canCallJava*/),
+          mStop(stop),
+          mStream(stream),
+          mCommandMQ(commandMQ),
+          mDataMQ(dataMQ),
+          mStatusMQ(statusMQ),
+          mEfGroup(efGroup),
+          mBuffer(nullptr) {}
+    bool init() {
+        mBuffer.reset(new (std::nothrow) uint8_t[mDataMQ->getQuantumCount()]);
+        return mBuffer != nullptr;
+    }
+    virtual ~WriteThread() {}
+
+   private:
+    std::atomic<bool>* mStop;
+    audio_stream_out_t* mStream;
+    StreamOut::CommandMQ* mCommandMQ;
+    StreamOut::DataMQ* mDataMQ;
+    StreamOut::StatusMQ* mStatusMQ;
+    EventFlag* mEfGroup;
+    std::unique_ptr<uint8_t[]> mBuffer;
+    IStreamOut::WriteStatus mStatus;
+
+    bool threadLoop() override;
+
+    void doGetLatency();
+    void doGetPresentationPosition();
+    void doWrite();
+};
+
+void WriteThread::doWrite() {
+    const size_t availToRead = mDataMQ->availableToRead();
+    mStatus.retval = Result::OK;
+    mStatus.reply.written = 0;
+    if (mDataMQ->read(&mBuffer[0], availToRead)) {
+        ssize_t writeResult = mStream->write(mStream, &mBuffer[0], availToRead);
+        if (writeResult >= 0) {
+            mStatus.reply.written = writeResult;
+        } else {
+            mStatus.retval = Stream::analyzeStatus("write", writeResult);
+        }
+    }
+}
+
+void WriteThread::doGetPresentationPosition() {
+    mStatus.retval =
+        StreamOut::getPresentationPositionImpl(mStream, &mStatus.reply.presentationPosition.frames,
+                                               &mStatus.reply.presentationPosition.timeStamp);
+}
+
+void WriteThread::doGetLatency() {
+    mStatus.retval = Result::OK;
+    mStatus.reply.latencyMs = mStream->get_latency(mStream);
+}
+
+bool WriteThread::threadLoop() {
+    // This implementation doesn't return control back to the Thread until it
+    // decides to stop,
+    // as the Thread uses mutexes, and this can lead to priority inversion.
+    while (!std::atomic_load_explicit(mStop, std::memory_order_acquire)) {
+        uint32_t efState = 0;
+        mEfGroup->wait(static_cast<uint32_t>(MessageQueueFlagBits::NOT_EMPTY), &efState);
+        if (!(efState & static_cast<uint32_t>(MessageQueueFlagBits::NOT_EMPTY))) {
+            continue;  // Nothing to do.
+        }
+        if (!mCommandMQ->read(&mStatus.replyTo)) {
+            continue;  // Nothing to do.
+        }
+        switch (mStatus.replyTo) {
+            case IStreamOut::WriteCommand::WRITE:
+                doWrite();
+                break;
+            case IStreamOut::WriteCommand::GET_PRESENTATION_POSITION:
+                doGetPresentationPosition();
+                break;
+            case IStreamOut::WriteCommand::GET_LATENCY:
+                doGetLatency();
+                break;
+            default:
+                ALOGE("Unknown write thread command code %d", mStatus.replyTo);
+                mStatus.retval = Result::NOT_SUPPORTED;
+                break;
+        }
+        if (!mStatusMQ->write(&mStatus)) {
+            ALOGE("status message queue write failed");
+        }
+        mEfGroup->wake(static_cast<uint32_t>(MessageQueueFlagBits::NOT_FULL));
+    }
+
+    return false;
+}
+
+}  // namespace
+
+StreamOut::StreamOut(const sp<Device>& device, audio_stream_out_t* stream)
+    : mDevice(device),
+      mStream(stream),
+      mStreamCommon(new Stream(false /*isInput*/, &stream->common)),
+      mStreamMmap(new StreamMmap<audio_stream_out_t>(stream)),
+      mEfGroup(nullptr),
+      mStopWriteThread(false) {}
+
+StreamOut::~StreamOut() {
+    ATRACE_CALL();
+    (void)close();
+    if (mWriteThread.get()) {
+        ATRACE_NAME("mWriteThread->join");
+        status_t status = mWriteThread->join();
+        ALOGE_IF(status, "write thread exit error: %s", strerror(-status));
+    }
+    if (mEfGroup) {
+        status_t status = EventFlag::deleteEventFlag(&mEfGroup);
+        ALOGE_IF(status, "write MQ event flag deletion error: %s", strerror(-status));
+    }
+    mCallback = nullptr;
+#if MAJOR_VERSION <= 5
+    mDevice->closeOutputStream(mStream);
+    // Closing the output stream in the HAL waits for the callback to finish,
+    // and joins the callback thread. Thus is it guaranteed that the callback
+    // thread will not be accessing our object anymore.
+#endif
+    mStream = nullptr;
+}
+
+// Methods from ::android::hardware::audio::CPP_VERSION::IStream follow.
+Return<uint64_t> StreamOut::getFrameSize() {
+    return audio_stream_out_frame_size(mStream);
+}
+
+Return<uint64_t> StreamOut::getFrameCount() {
+    return mStreamCommon->getFrameCount();
+}
+
+Return<uint64_t> StreamOut::getBufferSize() {
+    return mStreamCommon->getBufferSize();
+}
+
+#if MAJOR_VERSION <= 6
+Return<uint32_t> StreamOut::getSampleRate() {
+    return mStreamCommon->getSampleRate();
+}
+
+#if MAJOR_VERSION == 2
+Return<void> StreamOut::getSupportedChannelMasks(getSupportedChannelMasks_cb _hidl_cb) {
+    return mStreamCommon->getSupportedChannelMasks(_hidl_cb);
+}
+Return<void> StreamOut::getSupportedSampleRates(getSupportedSampleRates_cb _hidl_cb) {
+    return mStreamCommon->getSupportedSampleRates(_hidl_cb);
+}
+#endif
+
+Return<void> StreamOut::getSupportedChannelMasks(AudioFormat format,
+                                                 getSupportedChannelMasks_cb _hidl_cb) {
+    return mStreamCommon->getSupportedChannelMasks(format, _hidl_cb);
+}
+Return<void> StreamOut::getSupportedSampleRates(AudioFormat format,
+                                                getSupportedSampleRates_cb _hidl_cb) {
+    return mStreamCommon->getSupportedSampleRates(format, _hidl_cb);
+}
+
+Return<Result> StreamOut::setSampleRate(uint32_t sampleRateHz) {
+    return mStreamCommon->setSampleRate(sampleRateHz);
+}
+
+Return<AudioChannelBitfield> StreamOut::getChannelMask() {
+    return mStreamCommon->getChannelMask();
+}
+
+Return<Result> StreamOut::setChannelMask(AudioChannelBitfield mask) {
+    return mStreamCommon->setChannelMask(mask);
+}
+
+Return<AudioFormat> StreamOut::getFormat() {
+    return mStreamCommon->getFormat();
+}
+
+Return<void> StreamOut::getSupportedFormats(getSupportedFormats_cb _hidl_cb) {
+    return mStreamCommon->getSupportedFormats(_hidl_cb);
+}
+
+Return<Result> StreamOut::setFormat(AudioFormat format) {
+    return mStreamCommon->setFormat(format);
+}
+
+#else
+
+Return<void> StreamOut::getSupportedProfiles(getSupportedProfiles_cb _hidl_cb) {
+    return mStreamCommon->getSupportedProfiles(_hidl_cb);
+}
+
+Return<Result> StreamOut::setAudioProperties(const AudioConfigBaseOptional& config) {
+    return mStreamCommon->setAudioProperties(config);
+}
+
+#endif  // MAJOR_VERSION <= 6
+
+Return<void> StreamOut::getAudioProperties(getAudioProperties_cb _hidl_cb) {
+    return mStreamCommon->getAudioProperties(_hidl_cb);
+}
+
+Return<Result> StreamOut::addEffect(uint64_t effectId) {
+    return mStreamCommon->addEffect(effectId);
+}
+
+Return<Result> StreamOut::removeEffect(uint64_t effectId) {
+    return mStreamCommon->removeEffect(effectId);
+}
+
+Return<Result> StreamOut::standby() {
+    return mStreamCommon->standby();
+}
+
+Return<Result> StreamOut::setHwAvSync(uint32_t hwAvSync) {
+    return mStreamCommon->setHwAvSync(hwAvSync);
+}
+
+#if MAJOR_VERSION == 2
+Return<Result> StreamOut::setConnectedState(const DeviceAddress& address, bool connected) {
+    return mStreamCommon->setConnectedState(address, connected);
+}
+
+Return<AudioDevice> StreamOut::getDevice() {
+    return mStreamCommon->getDevice();
+}
+
+Return<Result> StreamOut::setDevice(const DeviceAddress& address) {
+    return mStreamCommon->setDevice(address);
+}
+
+Return<void> StreamOut::getParameters(const hidl_vec<hidl_string>& keys,
+                                      getParameters_cb _hidl_cb) {
+    return mStreamCommon->getParameters(keys, _hidl_cb);
+}
+
+Return<Result> StreamOut::setParameters(const hidl_vec<ParameterValue>& parameters) {
+    return mStreamCommon->setParameters(parameters);
+}
+
+Return<void> StreamOut::debugDump(const hidl_handle& fd) {
+    return mStreamCommon->debugDump(fd);
+}
+#elif MAJOR_VERSION >= 4
+Return<void> StreamOut::getDevices(getDevices_cb _hidl_cb) {
+    return mStreamCommon->getDevices(_hidl_cb);
+}
+
+Return<Result> StreamOut::setDevices(const hidl_vec<DeviceAddress>& devices) {
+    return mStreamCommon->setDevices(devices);
+}
+Return<void> StreamOut::getParameters(const hidl_vec<ParameterValue>& context,
+                                      const hidl_vec<hidl_string>& keys,
+                                      getParameters_cb _hidl_cb) {
+    return mStreamCommon->getParameters(context, keys, _hidl_cb);
+}
+
+Return<Result> StreamOut::setParameters(const hidl_vec<ParameterValue>& context,
+                                        const hidl_vec<ParameterValue>& parameters) {
+    return mStreamCommon->setParameters(context, parameters);
+}
+#endif
+
+Return<Result> StreamOut::close() {
+    if (mStopWriteThread.load(std::memory_order_relaxed)) {  // only this thread writes
+        return Result::INVALID_STATE;
+    }
+    mStopWriteThread.store(true, std::memory_order_release);
+    if (mEfGroup) {
+        mEfGroup->wake(static_cast<uint32_t>(MessageQueueFlagBits::NOT_EMPTY));
+    }
+#if MAJOR_VERSION >= 6
+    mDevice->closeOutputStream(mStream);
+#endif
+    return Result::OK;
+}
+
+// Methods from ::android::hardware::audio::CPP_VERSION::IStreamOut follow.
+Return<uint32_t> StreamOut::getLatency() {
+    return mStream->get_latency(mStream);
+}
+
+Return<Result> StreamOut::setVolume(float left, float right) {
+    if (mStream->set_volume == NULL) {
+        return Result::NOT_SUPPORTED;
+    }
+    if (!util::isGainNormalized(left)) {
+        ALOGW("Can not set a stream output volume {%f, %f} outside [0,1]", left, right);
+        return Result::INVALID_ARGUMENTS;
+    }
+    return Stream::analyzeStatus("set_volume", mStream->set_volume(mStream, left, right),
+                                 {ENOSYS} /*ignore*/);
+}
+
+Return<void> StreamOut::prepareForWriting(uint32_t frameSize, uint32_t framesCount,
+                                          prepareForWriting_cb _hidl_cb) {
+    status_t status;
+#if MAJOR_VERSION <= 6
+    ThreadInfo threadInfo = {0, 0};
+#else
+    int32_t threadInfo = 0;
+#endif
+
+    // Wrap the _hidl_cb to return an error
+    auto sendError = [&threadInfo, &_hidl_cb](Result result) {
+        _hidl_cb(result, CommandMQ::Descriptor(), DataMQ::Descriptor(), StatusMQ::Descriptor(),
+                 threadInfo);
+    };
+
+    // Create message queues.
+    if (mDataMQ) {
+        ALOGE("the client attempts to call prepareForWriting twice");
+        sendError(Result::INVALID_STATE);
+        return Void();
+    }
+    std::unique_ptr<CommandMQ> tempCommandMQ(new CommandMQ(1));
+
+    // Check frameSize and framesCount
+    if (frameSize == 0 || framesCount == 0) {
+        ALOGE("Null frameSize (%u) or framesCount (%u)", frameSize, framesCount);
+        sendError(Result::INVALID_ARGUMENTS);
+        return Void();
+    }
+    if (frameSize > Stream::MAX_BUFFER_SIZE / framesCount) {
+        ALOGE("Buffer too big: %u*%u bytes > MAX_BUFFER_SIZE (%u)", frameSize, framesCount,
+              Stream::MAX_BUFFER_SIZE);
+        sendError(Result::INVALID_ARGUMENTS);
+        return Void();
+    }
+    std::unique_ptr<DataMQ> tempDataMQ(new DataMQ(frameSize * framesCount, true /* EventFlag */));
+
+    std::unique_ptr<StatusMQ> tempStatusMQ(new StatusMQ(1));
+    if (!tempCommandMQ->isValid() || !tempDataMQ->isValid() || !tempStatusMQ->isValid()) {
+        ALOGE_IF(!tempCommandMQ->isValid(), "command MQ is invalid");
+        ALOGE_IF(!tempDataMQ->isValid(), "data MQ is invalid");
+        ALOGE_IF(!tempStatusMQ->isValid(), "status MQ is invalid");
+        sendError(Result::INVALID_ARGUMENTS);
+        return Void();
+    }
+    EventFlag* tempRawEfGroup{};
+    status = EventFlag::createEventFlag(tempDataMQ->getEventFlagWord(), &tempRawEfGroup);
+    std::unique_ptr<EventFlag, void (*)(EventFlag*)> tempElfGroup(
+        tempRawEfGroup, [](auto* ef) { EventFlag::deleteEventFlag(&ef); });
+    if (status != OK || !tempElfGroup) {
+        ALOGE("failed creating event flag for data MQ: %s", strerror(-status));
+        sendError(Result::INVALID_ARGUMENTS);
+        return Void();
+    }
+
+    // Create and launch the thread.
+    auto tempWriteThread =
+            sp<WriteThread>::make(&mStopWriteThread, mStream, tempCommandMQ.get(), tempDataMQ.get(),
+                                  tempStatusMQ.get(), tempElfGroup.get());
+    if (!tempWriteThread->init()) {
+        ALOGW("failed to start writer thread: %s", strerror(-status));
+        sendError(Result::INVALID_ARGUMENTS);
+        return Void();
+    }
+    status = tempWriteThread->run("writer", PRIORITY_URGENT_AUDIO);
+    if (status != OK) {
+        ALOGW("failed to start writer thread: %s", strerror(-status));
+        sendError(Result::INVALID_ARGUMENTS);
+        return Void();
+    }
+
+    mCommandMQ = std::move(tempCommandMQ);
+    mDataMQ = std::move(tempDataMQ);
+    mStatusMQ = std::move(tempStatusMQ);
+    mWriteThread = tempWriteThread;
+    mEfGroup = tempElfGroup.release();
+#if MAJOR_VERSION <= 6
+    threadInfo.pid = getpid();
+    threadInfo.tid = mWriteThread->getTid();
+#else
+    threadInfo = mWriteThread->getTid();
+#endif
+    _hidl_cb(Result::OK, *mCommandMQ->getDesc(), *mDataMQ->getDesc(), *mStatusMQ->getDesc(),
+             threadInfo);
+    return Void();
+}
+
+Return<void> StreamOut::getRenderPosition(getRenderPosition_cb _hidl_cb) {
+    uint32_t halDspFrames;
+    Result retval = Stream::analyzeStatus("get_render_position",
+                                          mStream->get_render_position(mStream, &halDspFrames),
+                                          {ENOSYS} /*ignore*/);
+    _hidl_cb(retval, halDspFrames);
+    return Void();
+}
+
+Return<void> StreamOut::getNextWriteTimestamp(getNextWriteTimestamp_cb _hidl_cb) {
+    Result retval(Result::NOT_SUPPORTED);
+    int64_t timestampUs = 0;
+    if (mStream->get_next_write_timestamp != NULL) {
+        retval = Stream::analyzeStatus("get_next_write_timestamp",
+                                       mStream->get_next_write_timestamp(mStream, &timestampUs),
+                                       {ENOSYS} /*ignore*/);
+    }
+    _hidl_cb(retval, timestampUs);
+    return Void();
+}
+
+Return<Result> StreamOut::setCallback(const sp<IStreamOutCallback>& callback) {
+    if (mStream->set_callback == NULL) return Result::NOT_SUPPORTED;
+    // Safe to pass 'this' because it is guaranteed that the callback thread
+    // is joined prior to exit from StreamOut's destructor.
+    int result = mStream->set_callback(mStream, StreamOut::asyncCallback, this);
+    if (result == 0) {
+        mCallback = callback;
+    }
+    return Stream::analyzeStatus("set_callback", result, {ENOSYS} /*ignore*/);
+}
+
+Return<Result> StreamOut::clearCallback() {
+    if (mStream->set_callback == NULL) return Result::NOT_SUPPORTED;
+    mCallback = nullptr;
+    return Result::OK;
+}
+
+// static
+int StreamOut::asyncCallback(stream_callback_event_t event, void*, void* cookie) {
+    // It is guaranteed that the callback thread is joined prior
+    // to exiting from StreamOut's destructor. Must *not* use sp<StreamOut>
+    // here because it can make this code the last owner of StreamOut,
+    // and an attempt to run the destructor on the callback thread
+    // will cause a deadlock in the legacy HAL code.
+    StreamOut* self = reinterpret_cast<StreamOut*>(cookie);
+    // It's correct to hold an sp<> to callback because the reference
+    // in the StreamOut instance can be cleared in the meantime. There is
+    // no difference on which thread to run IStreamOutCallback's destructor.
+    sp<IStreamOutCallback> callback = self->mCallback.load();
+    if (callback.get() == nullptr) return 0;
+    ALOGV("asyncCallback() event %d", event);
+    Return<void> result;
+    switch (event) {
+        case STREAM_CBK_EVENT_WRITE_READY:
+            result = callback->onWriteReady();
+            break;
+        case STREAM_CBK_EVENT_DRAIN_READY:
+            result = callback->onDrainReady();
+            break;
+        case STREAM_CBK_EVENT_ERROR:
+            result = callback->onError();
+            break;
+        default:
+            ALOGW("asyncCallback() unknown event %d", event);
+            break;
+    }
+    ALOGW_IF(!result.isOk(), "Client callback failed: %s", result.description().c_str());
+    return 0;
+}
+
+Return<void> StreamOut::supportsPauseAndResume(supportsPauseAndResume_cb _hidl_cb) {
+    _hidl_cb(mStream->pause != NULL, mStream->resume != NULL);
+    return Void();
+}
+
+Return<Result> StreamOut::pause() {
+    return mStream->pause != NULL
+                   ? Stream::analyzeStatus("pause", mStream->pause(mStream), {ENOSYS} /*ignore*/)
+                   : Result::NOT_SUPPORTED;
+}
+
+Return<Result> StreamOut::resume() {
+    return mStream->resume != NULL
+                   ? Stream::analyzeStatus("resume", mStream->resume(mStream), {ENOSYS} /*ignore*/)
+                   : Result::NOT_SUPPORTED;
+}
+
+Return<bool> StreamOut::supportsDrain() {
+    return mStream->drain != NULL;
+}
+
+Return<Result> StreamOut::drain(AudioDrain type) {
+    audio_drain_type_t halDrainType =
+            type == AudioDrain::EARLY_NOTIFY ? AUDIO_DRAIN_EARLY_NOTIFY : AUDIO_DRAIN_ALL;
+    return mStream->drain != NULL
+                   ? Stream::analyzeStatus("drain", mStream->drain(mStream, halDrainType),
+                                           {ENOSYS} /*ignore*/)
+                   : Result::NOT_SUPPORTED;
+}
+
+Return<Result> StreamOut::flush() {
+    return mStream->flush != NULL
+                   ? Stream::analyzeStatus("flush", mStream->flush(mStream), {ENOSYS} /*ignore*/)
+                   : Result::NOT_SUPPORTED;
+}
+
+// static
+Result StreamOut::getPresentationPositionImpl(audio_stream_out_t* stream, uint64_t* frames,
+                                              TimeSpec* timeStamp) {
+    // Don't logspam on EINVAL--it's normal for get_presentation_position
+    // to return it sometimes. EAGAIN may be returned by A2DP audio HAL
+    // implementation. ENODATA can also be reported while the writer is
+    // continuously querying it, but the stream has been stopped.
+    static const std::vector<int> ignoredErrors{EINVAL, EAGAIN, ENODATA, ENOSYS};
+    Result retval(Result::NOT_SUPPORTED);
+    if (stream->get_presentation_position == NULL) return retval;
+    struct timespec halTimeStamp;
+    retval = Stream::analyzeStatus("get_presentation_position",
+                                   stream->get_presentation_position(stream, frames, &halTimeStamp),
+                                   ignoredErrors);
+    if (retval == Result::OK) {
+        timeStamp->tvSec = halTimeStamp.tv_sec;
+        timeStamp->tvNSec = halTimeStamp.tv_nsec;
+    }
+    return retval;
+}
+
+Return<void> StreamOut::getPresentationPosition(getPresentationPosition_cb _hidl_cb) {
+    uint64_t frames = 0;
+    TimeSpec timeStamp = {0, 0};
+    Result retval = getPresentationPositionImpl(mStream, &frames, &timeStamp);
+    _hidl_cb(retval, frames, timeStamp);
+    return Void();
+}
+
+Return<Result> StreamOut::start() {
+    return mStreamMmap->start();
+}
+
+Return<Result> StreamOut::stop() {
+    return mStreamMmap->stop();
+}
+
+Return<void> StreamOut::createMmapBuffer(int32_t minSizeFrames, createMmapBuffer_cb _hidl_cb) {
+    return mStreamMmap->createMmapBuffer(minSizeFrames, audio_stream_out_frame_size(mStream),
+                                         _hidl_cb);
+}
+
+Return<void> StreamOut::getMmapPosition(getMmapPosition_cb _hidl_cb) {
+    return mStreamMmap->getMmapPosition(_hidl_cb);
+}
+
+Return<void> StreamOut::debug(const hidl_handle& fd, const hidl_vec<hidl_string>& options) {
+    return mStreamCommon->debug(fd, options);
+}
+
+#if MAJOR_VERSION >= 4
+Result StreamOut::doUpdateSourceMetadata(const SourceMetadata& sourceMetadata) {
+    std::vector<playback_track_metadata_t> halTracks;
+#if MAJOR_VERSION <= 6
+    (void)CoreUtils::sourceMetadataToHal(sourceMetadata, &halTracks);
+#else
+    // Validate whether a conversion to V7 is possible. This is needed
+    // to have a consistent behavior of the HAL regardless of the API
+    // version of the legacy HAL (and also to be consistent with openOutputStream).
+    std::vector<playback_track_metadata_v7> halTracksV7;
+    if (status_t status = CoreUtils::sourceMetadataToHalV7(
+                sourceMetadata, false /*ignoreNonVendorTags*/, &halTracksV7);
+        status == NO_ERROR) {
+        halTracks.reserve(halTracksV7.size());
+        for (auto metadata_v7 : halTracksV7) {
+            halTracks.push_back(std::move(metadata_v7.base));
+        }
+    } else {
+        return Stream::analyzeStatus("sourceMetadataToHal", status);
+    }
+#endif  // MAJOR_VERSION <= 6
+    const source_metadata_t halMetadata = {
+        .track_count = halTracks.size(),
+        .tracks = halTracks.data(),
+    };
+    mStream->update_source_metadata(mStream, &halMetadata);
+    return Result::OK;
+}
+
+#if MAJOR_VERSION >= 7
+Result StreamOut::doUpdateSourceMetadataV7(const SourceMetadata& sourceMetadata) {
+    std::vector<playback_track_metadata_v7> halTracks;
+    if (status_t status = CoreUtils::sourceMetadataToHalV7(
+                sourceMetadata, false /*ignoreNonVendorTags*/, &halTracks);
+        status != NO_ERROR) {
+        return Stream::analyzeStatus("sourceMetadataToHal", status);
+    }
+    const source_metadata_v7_t halMetadata = {
+            .track_count = halTracks.size(),
+            .tracks = halTracks.data(),
+    };
+    mStream->update_source_metadata_v7(mStream, &halMetadata);
+    return Result::OK;
+}
+#endif  //  MAJOR_VERSION >= 7
+
+#if MAJOR_VERSION <= 6
+Return<void> StreamOut::updateSourceMetadata(const SourceMetadata& sourceMetadata) {
+    if (mStream->update_source_metadata == nullptr) {
+        return Void();  // not supported by the HAL
+    }
+    (void)doUpdateSourceMetadata(sourceMetadata);
+    return Void();
+}
+#elif MAJOR_VERSION >= 7
+Return<Result> StreamOut::updateSourceMetadata(const SourceMetadata& sourceMetadata) {
+    if (mDevice->version() < AUDIO_DEVICE_API_VERSION_3_2) {
+        if (mStream->update_source_metadata == nullptr) {
+            return Result::NOT_SUPPORTED;
+        }
+        return doUpdateSourceMetadata(sourceMetadata);
+    } else {
+        if (mStream->update_source_metadata_v7 == nullptr) {
+            return Result::NOT_SUPPORTED;
+        }
+        return doUpdateSourceMetadataV7(sourceMetadata);
+    }
+}
+#endif
+
+Return<Result> StreamOut::selectPresentation(int32_t /*presentationId*/, int32_t /*programId*/) {
+    return Result::NOT_SUPPORTED;  // TODO: propagate to legacy
+}
+#endif
+
+#if MAJOR_VERSION >= 6
+Return<void> StreamOut::getDualMonoMode(getDualMonoMode_cb _hidl_cb) {
+    audio_dual_mono_mode_t mode = AUDIO_DUAL_MONO_MODE_OFF;
+    Result retval = mStream->get_dual_mono_mode != nullptr
+                            ? Stream::analyzeStatus("get_dual_mono_mode",
+                                                    mStream->get_dual_mono_mode(mStream, &mode))
+                            : Result::NOT_SUPPORTED;
+    _hidl_cb(retval, DualMonoMode(mode));
+    return Void();
+}
+
+Return<Result> StreamOut::setDualMonoMode(DualMonoMode mode) {
+    return mStream->set_dual_mono_mode != nullptr
+                   ? Stream::analyzeStatus(
+                             "set_dual_mono_mode",
+                             mStream->set_dual_mono_mode(mStream,
+                                                         static_cast<audio_dual_mono_mode_t>(mode)))
+                   : Result::NOT_SUPPORTED;
+}
+
+Return<void> StreamOut::getAudioDescriptionMixLevel(getAudioDescriptionMixLevel_cb _hidl_cb) {
+    float leveldB = -std::numeric_limits<float>::infinity();
+    Result retval = mStream->get_audio_description_mix_level != nullptr
+                            ? Stream::analyzeStatus(
+                                      "get_audio_description_mix_level",
+                                      mStream->get_audio_description_mix_level(mStream, &leveldB))
+                            : Result::NOT_SUPPORTED;
+    _hidl_cb(retval, leveldB);
+    return Void();
+}
+
+Return<Result> StreamOut::setAudioDescriptionMixLevel(float leveldB) {
+    return mStream->set_audio_description_mix_level != nullptr
+                   ? Stream::analyzeStatus(
+                             "set_audio_description_mix_level",
+                             mStream->set_audio_description_mix_level(mStream, leveldB))
+                   : Result::NOT_SUPPORTED;
+}
+
+Return<void> StreamOut::getPlaybackRateParameters(getPlaybackRateParameters_cb _hidl_cb) {
+    audio_playback_rate_t rate = AUDIO_PLAYBACK_RATE_INITIALIZER;
+    Result retval =
+            mStream->get_playback_rate_parameters != nullptr
+                    ? Stream::analyzeStatus("get_playback_rate_parameters",
+                                            mStream->get_playback_rate_parameters(mStream, &rate))
+                    : Result::NOT_SUPPORTED;
+    _hidl_cb(retval,
+             PlaybackRate{rate.mSpeed, rate.mPitch, static_cast<TimestretchMode>(rate.mStretchMode),
+                          static_cast<TimestretchFallbackMode>(rate.mFallbackMode)});
+    return Void();
+}
+
+Return<Result> StreamOut::setPlaybackRateParameters(const PlaybackRate& playbackRate) {
+    audio_playback_rate_t rate = {
+            playbackRate.speed, playbackRate.pitch,
+            static_cast<audio_timestretch_stretch_mode_t>(playbackRate.timestretchMode),
+            static_cast<audio_timestretch_fallback_mode_t>(playbackRate.fallbackMode)};
+    return mStream->set_playback_rate_parameters != nullptr
+                   ? Stream::analyzeStatus("set_playback_rate_parameters",
+                                           mStream->set_playback_rate_parameters(mStream, &rate))
+                   : Result::NOT_SUPPORTED;
+}
+
+Return<Result> StreamOut::setEventCallback(const sp<IStreamOutEventCallback>& callback) {
+    if (mStream->set_event_callback == nullptr) return Result::NOT_SUPPORTED;
+    int result = mStream->set_event_callback(mStream, StreamOut::asyncEventCallback, this);
+    if (result == 0) {
+        mEventCallback = callback;
+    }
+    return Stream::analyzeStatus("set_stream_out_callback", result, {ENOSYS} /*ignore*/);
+}
+
+// static
+int StreamOut::asyncEventCallback(stream_event_callback_type_t event, void* param, void* cookie) {
+    StreamOut* self = reinterpret_cast<StreamOut*>(cookie);
+    sp<IStreamOutEventCallback> eventCallback = self->mEventCallback.load();
+    if (eventCallback.get() == nullptr) return 0;
+    ALOGV("%s event %d", __func__, event);
+    Return<void> result;
+    switch (event) {
+        case STREAM_EVENT_CBK_TYPE_CODEC_FORMAT_CHANGED: {
+            hidl_vec<uint8_t> audioMetadata;
+            // void* param is the byte string buffer from byte_string_from_audio_metadata().
+            // As the byte string buffer may have embedded zeroes, we cannot use strlen()
+            // but instead use audio_utils::metadata::dataByteStringLen().
+            audioMetadata.setToExternal((uint8_t*)param, audio_utils::metadata::dataByteStringLen(
+                                                                 (const uint8_t*)param));
+            result = eventCallback->onCodecFormatChanged(audioMetadata);
+        } break;
+        default:
+            ALOGW("%s unknown event %d", __func__, event);
+            break;
+    }
+    ALOGW_IF(!result.isOk(), "Client callback failed: %s", result.description().c_str());
+    return 0;
+}
+
+#if MAJOR_VERSION == 7 && MINOR_VERSION == 1
+Return<Result> StreamOut::setLatencyMode(LatencyMode mode) {
+    return mStream->set_latency_mode != nullptr
+                   ? Stream::analyzeStatus(
+                             "set_latency_mode",
+                             mStream->set_latency_mode(mStream,
+                                                       static_cast<audio_latency_mode_t>(mode)))
+                   : Result::NOT_SUPPORTED;
+};
+
+Return<void> StreamOut::getRecommendedLatencyModes(getRecommendedLatencyModes_cb _hidl_cb) {
+    Result retval = Result::NOT_SUPPORTED;
+    hidl_vec<LatencyMode> hidlModes;
+    size_t num_modes = AUDIO_LATENCY_MODE_CNT;
+    audio_latency_mode_t modes[AUDIO_LATENCY_MODE_CNT];
+
+    if (mStream->get_recommended_latency_modes != nullptr &&
+        mStream->get_recommended_latency_modes(mStream, &modes[0], &num_modes) == 0) {
+        if (num_modes == 0 || num_modes > AUDIO_LATENCY_MODE_CNT) {
+            ALOGW("%s invalid number of modes returned: %zu", __func__, num_modes);
+            retval = Result::INVALID_STATE;
+        } else {
+            hidlModes.resize(num_modes);
+            for (size_t i = 0; i < num_modes; ++i) {
+                hidlModes[i] = static_cast<LatencyMode>(modes[i]);
+            }
+            retval = Result::OK;
+        }
+    }
+    _hidl_cb(retval, hidlModes);
+    return Void();
+};
+
+// static
+void StreamOut::latencyModeCallback(audio_latency_mode_t* modes, size_t num_modes, void* cookie) {
+    StreamOut* self = reinterpret_cast<StreamOut*>(cookie);
+    sp<IStreamOutLatencyModeCallback> callback = self->mLatencyModeCallback.load();
+    if (callback.get() == nullptr) return;
+
+    ALOGV("%s", __func__);
+
+    if (num_modes == 0 || num_modes > AUDIO_LATENCY_MODE_CNT) {
+        ALOGW("%s invalid number of modes returned: %zu", __func__, num_modes);
+        return;
+    }
+
+    hidl_vec<LatencyMode> hidlModes(num_modes);
+    for (size_t i = 0; i < num_modes; ++i) {
+        hidlModes[i] = static_cast<LatencyMode>(modes[i]);
+    }
+    Return<void> result = callback->onRecommendedLatencyModeChanged(hidlModes);
+    ALOGW_IF(!result.isOk(), "Client callback failed: %s", result.description().c_str());
+}
+
+Return<Result> StreamOut::setLatencyModeCallback(
+        const sp<IStreamOutLatencyModeCallback>& callback) {
+    if (mStream->set_latency_mode_callback == nullptr) return Result::NOT_SUPPORTED;
+    int result = mStream->set_latency_mode_callback(mStream, StreamOut::latencyModeCallback, this);
+    if (result == 0) {
+        mLatencyModeCallback = callback;
+    }
+    return Stream::analyzeStatus("set_latency_mode_callback", result, {ENOSYS} /*ignore*/);
+};
+
+#endif
+
+#endif
+
+}  // namespace implementation
+}  // namespace CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android

audio/hal/StreamOut.h

@@ -0,0 +1,201 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_AUDIO_STREAMOUT_H
+#define ANDROID_HARDWARE_AUDIO_STREAMOUT_H
+
+#include PATH(android/hardware/audio/FILE_VERSION/IStreamOut.h)
+
+#include "Device.h"
+#include "Stream.h"
+
+#include <atomic>
+#include <memory>
+
+#include <fmq/EventFlag.h>
+#include <fmq/MessageQueue.h>
+#include <hidl/MQDescriptor.h>
+#include <hidl/Status.h>
+#include <mediautils/Synchronization.h>
+#include <utils/Thread.h>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CPP_VERSION {
+namespace implementation {
+
+using ::android::sp;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using namespace ::android::hardware::audio::common::COMMON_TYPES_CPP_VERSION;
+using namespace ::android::hardware::audio::CORE_TYPES_CPP_VERSION;
+using namespace ::android::hardware::audio::CPP_VERSION;
+
+struct StreamOut : public IStreamOut {
+    typedef MessageQueue<WriteCommand, kSynchronizedReadWrite> CommandMQ;
+    typedef MessageQueue<uint8_t, kSynchronizedReadWrite> DataMQ;
+    typedef MessageQueue<WriteStatus, kSynchronizedReadWrite> StatusMQ;
+
+    StreamOut(const sp<Device>& device, audio_stream_out_t* stream);
+
+    // Methods from ::android::hardware::audio::CPP_VERSION::IStream follow.
+    Return<uint64_t> getFrameSize() override;
+    Return<uint64_t> getFrameCount() override;
+    Return<uint64_t> getBufferSize() override;
+#if MAJOR_VERSION <= 6
+    Return<uint32_t> getSampleRate() override;
+#if MAJOR_VERSION == 2
+    Return<void> getSupportedSampleRates(getSupportedSampleRates_cb _hidl_cb) override;
+    Return<void> getSupportedChannelMasks(getSupportedChannelMasks_cb _hidl_cb) override;
+#endif
+    Return<void> getSupportedSampleRates(AudioFormat format, getSupportedSampleRates_cb _hidl_cb);
+    Return<void> getSupportedChannelMasks(AudioFormat format, getSupportedChannelMasks_cb _hidl_cb);
+    Return<Result> setSampleRate(uint32_t sampleRateHz) override;
+    Return<AudioChannelBitfield> getChannelMask() override;
+    Return<Result> setChannelMask(AudioChannelBitfield mask) override;
+    Return<AudioFormat> getFormat() override;
+    Return<void> getSupportedFormats(getSupportedFormats_cb _hidl_cb) override;
+    Return<Result> setFormat(AudioFormat format) override;
+#else
+    Return<void> getSupportedProfiles(getSupportedProfiles_cb _hidl_cb) override;
+    Return<Result> setAudioProperties(const AudioConfigBaseOptional& config) override;
+#endif  // MAJOR_VERSION <= 6
+    Return<void> getAudioProperties(getAudioProperties_cb _hidl_cb) override;
+    Return<Result> addEffect(uint64_t effectId) override;
+    Return<Result> removeEffect(uint64_t effectId) override;
+    Return<Result> standby() override;
+#if MAJOR_VERSION == 2
+    Return<AudioDevice> getDevice() override;
+    Return<Result> setDevice(const DeviceAddress& address) override;
+    Return<void> getParameters(const hidl_vec<hidl_string>& keys,
+                               getParameters_cb _hidl_cb) override;
+    Return<Result> setParameters(const hidl_vec<ParameterValue>& parameters) override;
+    Return<Result> setConnectedState(const DeviceAddress& address, bool connected) override;
+#elif MAJOR_VERSION >= 4
+    Return<void> getDevices(getDevices_cb _hidl_cb) override;
+    Return<Result> setDevices(const hidl_vec<DeviceAddress>& devices) override;
+    Return<void> getParameters(const hidl_vec<ParameterValue>& context,
+                               const hidl_vec<hidl_string>& keys,
+                               getParameters_cb _hidl_cb) override;
+    Return<Result> setParameters(const hidl_vec<ParameterValue>& context,
+                                 const hidl_vec<ParameterValue>& parameters) override;
+#endif
+    Return<Result> setHwAvSync(uint32_t hwAvSync) override;
+    Return<Result> close() override;
+
+    Return<void> debug(const hidl_handle& fd, const hidl_vec<hidl_string>& options) override;
+#if MAJOR_VERSION == 2
+    Return<void> debugDump(const hidl_handle& fd) override;
+#endif
+
+    // Methods from ::android::hardware::audio::CPP_VERSION::IStreamOut follow.
+    Return<uint32_t> getLatency() override;
+    Return<Result> setVolume(float left, float right) override;
+    Return<void> prepareForWriting(uint32_t frameSize, uint32_t framesCount,
+                                   prepareForWriting_cb _hidl_cb) override;
+    Return<void> getRenderPosition(getRenderPosition_cb _hidl_cb) override;
+    Return<void> getNextWriteTimestamp(getNextWriteTimestamp_cb _hidl_cb) override;
+    Return<Result> setCallback(const sp<IStreamOutCallback>& callback) override;
+    Return<Result> clearCallback() override;
+    Return<void> supportsPauseAndResume(supportsPauseAndResume_cb _hidl_cb) override;
+    Return<Result> pause() override;
+    Return<Result> resume() override;
+    Return<bool> supportsDrain() override;
+    Return<Result> drain(AudioDrain type) override;
+    Return<Result> flush() override;
+    Return<void> getPresentationPosition(getPresentationPosition_cb _hidl_cb) override;
+    Return<Result> start() override;
+    Return<Result> stop() override;
+    Return<void> createMmapBuffer(int32_t minSizeFrames, createMmapBuffer_cb _hidl_cb) override;
+    Return<void> getMmapPosition(getMmapPosition_cb _hidl_cb) override;
+#if MAJOR_VERSION >= 4
+    Return<Result> selectPresentation(int32_t presentationId, int32_t programId) override;
+#if MAJOR_VERSION <= 6
+    Return<void> updateSourceMetadata(const SourceMetadata& sourceMetadata) override;
+#else
+    Return<Result> updateSourceMetadata(const SourceMetadata& sourceMetadata) override;
+#endif
+#endif  // MAJOR_VERSION >= 4
+#if MAJOR_VERSION >= 6
+    Return<void> getDualMonoMode(getDualMonoMode_cb _hidl_cb) override;
+    Return<Result> setDualMonoMode(DualMonoMode mode) override;
+    Return<void> getAudioDescriptionMixLevel(getAudioDescriptionMixLevel_cb _hidl_cb) override;
+    Return<Result> setAudioDescriptionMixLevel(float leveldB) override;
+    Return<void> getPlaybackRateParameters(getPlaybackRateParameters_cb _hidl_cb) override;
+    Return<Result> setPlaybackRateParameters(const PlaybackRate& playbackRate) override;
+#endif
+
+    static Result getPresentationPositionImpl(audio_stream_out_t* stream, uint64_t* frames,
+                                              TimeSpec* timeStamp);
+
+#if MAJOR_VERSION >= 6
+    Return<Result> setEventCallback(const sp<IStreamOutEventCallback>& callback) override;
+#endif
+
+  private:
+#if MAJOR_VERSION >= 4
+    Result doUpdateSourceMetadata(const SourceMetadata& sourceMetadata);
+#if MAJOR_VERSION >= 7
+    Result doUpdateSourceMetadataV7(const SourceMetadata& sourceMetadata);
+#if MAJOR_VERSION == 7 && MINOR_VERSION == 1
+    Return<Result> setLatencyMode(LatencyMode mode) override;
+    Return<void> getRecommendedLatencyModes(getRecommendedLatencyModes_cb _hidl_cb) override;
+    Return<Result> setLatencyModeCallback(
+            const sp<IStreamOutLatencyModeCallback>& callback) override;
+#endif
+#endif
+#endif  // MAJOR_VERSION >= 4
+
+    const sp<Device> mDevice;
+    audio_stream_out_t* mStream;
+    const sp<Stream> mStreamCommon;
+    const sp<StreamMmap<audio_stream_out_t>> mStreamMmap;
+    mediautils::atomic_sp<IStreamOutCallback> mCallback;  // for non-blocking write and drain
+#if MAJOR_VERSION >= 6
+    mediautils::atomic_sp<IStreamOutEventCallback> mEventCallback;
+#if MAJOR_VERSION == 7 && MINOR_VERSION == 1
+    mediautils::atomic_sp<IStreamOutLatencyModeCallback> mLatencyModeCallback;
+#endif
+#endif
+    std::unique_ptr<CommandMQ> mCommandMQ;
+    std::unique_ptr<DataMQ> mDataMQ;
+    std::unique_ptr<StatusMQ> mStatusMQ;
+    EventFlag* mEfGroup;
+    std::atomic<bool> mStopWriteThread;
+    sp<Thread> mWriteThread;
+
+    virtual ~StreamOut();
+
+    static int asyncCallback(stream_callback_event_t event, void* param, void* cookie);
+
+#if MAJOR_VERSION >= 6
+    static int asyncEventCallback(stream_event_callback_type_t event, void* param, void* cookie);
+#if MAJOR_VERSION == 7 && MINOR_VERSION == 1
+    static void latencyModeCallback(audio_latency_mode_t* modes, size_t num_modes, void* cookie);
+#endif
+#endif
+};
+
+}  // namespace implementation
+}  // namespace CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_AUDIO_STREAMOUT_H

audio/hal/Util.h

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_AUDIO_UTIL_H
+#define ANDROID_HARDWARE_AUDIO_UTIL_H
+
+// clang-format off
+#include PATH(android/hardware/audio/CORE_TYPES_FILE_VERSION/types.h)
+// clang-format on
+
+#include <algorithm>
+#include <vector>
+
+#include <system/audio.h>
+
+namespace android {
+namespace hardware {
+namespace audio {
+namespace CORE_TYPES_CPP_VERSION {
+namespace implementation {
+
+using namespace ::android::hardware::audio::common::COMMON_TYPES_CPP_VERSION;
+using namespace ::android::hardware::audio::CORE_TYPES_CPP_VERSION;
+
+namespace util {
+
+/** @return true if gain is between 0 and 1 included. */
+constexpr bool isGainNormalized(float gain) {
+    return gain >= 0.0 && gain <= 1.0;
+}
+
+template <typename T>
+inline bool element_in(T e, const std::vector<T>& v) {
+    return std::find(v.begin(), v.end(), e) != v.end();
+}
+
+static inline Result analyzeStatus(status_t status) {
+    switch (status) {
+        case 0:
+            return Result::OK;
+        case -EINVAL:
+            return Result::INVALID_ARGUMENTS;
+        case -ENODATA:
+            return Result::INVALID_STATE;
+        case -ENODEV:
+            return Result::NOT_INITIALIZED;
+        case -ENOSYS:
+            return Result::NOT_SUPPORTED;
+        default:
+            return Result::INVALID_STATE;
+    }
+}
+
+static inline Result analyzeStatus(const char* className, const char* funcName, status_t status,
+                                   const std::vector<int>& ignoreErrors = {}) {
+    if (status != 0 && !element_in(-status, ignoreErrors)) {
+        ALOGW("Error from HAL %s in function %s: %s", className, funcName, strerror(-status));
+    }
+    return analyzeStatus(status);
+}
+
+}  // namespace util
+}  // namespace implementation
+}  // namespace CORE_TYPES_CPP_VERSION
+}  // namespace audio
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_AUDIO_UTIL_H

audio/hal/service.cpp

@@ -0,0 +1,15 @@
+#include "DevicesFactory.h"
+#include PATH(android/hardware/audio/FILE_VERSION/IDevicesFactory.h)
+
+#include <hidl/Status.h>
+
+using ::android::status_t;
+using ::android::hardware::audio::CPP_VERSION::implementation::DevicesFactory;
+using namespace ::android::hardware::audio::CPP_VERSION;
+
+extern "C" __attribute__((visibility("default")))
+status_t createIDevicesFactory(const char *instance_name) {
+  ::android::sp<IDevicesFactory> audio_factory = new DevicesFactory();
+  ::android::status_t hidl_status = audio_factory->registerAsService(instance_name);
+  return hidl_status;
+}

base.mk

@@ -8,6 +8,15 @@ PRODUCT_COPY_FILES := \
 	frameworks/native/data/etc/android.hardware.bluetooth_le.xml:system/etc/permissions/android.hardware.bluetooth_le.xml \
 	frameworks/native/data/etc/android.hardware.usb.host.xml:system/etc/permissions/android.hardware.usb.host.xml \
 
+# Bluetooth Audio (System-side HAL, sysbta)
+PRODUCT_PACKAGES += \
+    audio.sysbta.default \
+    android.hardware.bluetooth.audio-service-system
+
+PRODUCT_COPY_FILES += \
+    device/phh/treble/bluetooth/audio/config/sysbta_audio_policy_configuration.xml:$(TARGET_COPY_OUT_SYSTEM)/etc/sysbta_audio_policy_configuration.xml \
+    device/phh/treble/bluetooth/audio/config/sysbta_audio_policy_configuration_7_0.xml:$(TARGET_COPY_OUTY_SYSTEM)/etc/sysbta_audio_policy_configuration_7_0.xml
+
 #Use a more decent APN config
 PRODUCT_COPY_FILES += \
 	device/sample/etc/apns-full-conf.xml:system/etc/apns-conf.xml
@@ -135,6 +144,7 @@ PRODUCT_COPY_FILES += \
 	device/phh/treble/files/bv9500plus-mtk-kpd.kl:system/phh/bv9500plus-mtk-kpd.kl \
 	device/phh/treble/files/moto-liber-gpio-keys.kl:system/phh/moto-liber-gpio-keys.kl \
 	device/phh/treble/files/tecno-touchpanel.kl:system/phh/tecno-touchpanel.kl \
+	device/phh/treble/files/rosemary-excluded-input-devices.xml:system/phh/rosemary-excluded-input-devices.xml
 
 SELINUX_IGNORE_NEVERALLOWS := true
 
@@ -214,6 +224,10 @@ PRODUCT_PRODUCT_PROPERTIES += \
 PRODUCT_PACKAGES += \
     NavigationBarMode2ButtonOverlay
 
+# ThemePicker
+PRODUCT_PACKAGES += \
+    ThemePicker
+
 PRODUCT_PACKAGES += \
 	oplus-alert-slider
 

bluetooth/audio/config/sysbta_audio_policy_configuration.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Bluetooth Audio HAL Audio Policy Configuration file -->
+<module name="sysbta" halVersion="2.0">
+    <mixPorts>
+        <!-- A2DP Audio Ports -->
+        <mixPort name="a2dp output" role="source"/>
+        <!-- Hearing AIDs Audio Ports -->
+        <mixPort name="hearing aid output" role="source">
+            <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                     samplingRates="24000,16000"
+                     channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
+        </mixPort>
+    </mixPorts>
+    <devicePorts>
+        <!-- A2DP Audio Ports -->
+        <devicePort tagName="BT A2DP Out" type="AUDIO_DEVICE_OUT_BLUETOOTH_A2DP" role="sink">
+            <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                     samplingRates="44100,48000,88200,96000"
+                     channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
+        </devicePort>
+        <devicePort tagName="BT A2DP Headphones" type="AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES" role="sink">
+            <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                     samplingRates="44100,48000,88200,96000"
+                     channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
+        </devicePort>
+        <devicePort tagName="BT A2DP Speaker" type="AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER" role="sink">
+            <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                     samplingRates="44100,48000,88200,96000"
+                     channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
+        </devicePort>
+        <!-- Hearing AIDs Audio Ports -->
+        <devicePort tagName="BT Hearing Aid Out" type="AUDIO_DEVICE_OUT_HEARING_AID" role="sink"/>
+    </devicePorts>
+    <routes>
+        <route type="mix" sink="BT A2DP Out"
+               sources="a2dp output"/>
+        <route type="mix" sink="BT A2DP Headphones"
+               sources="a2dp output"/>
+        <route type="mix" sink="BT A2DP Speaker"
+               sources="a2dp output"/>
+        <route type="mix" sink="BT Hearing Aid Out"
+               sources="hearing aid output"/>
+    </routes>
+</module>

bluetooth/audio/config/sysbta_audio_policy_configuration_7_0.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Bluetooth Audio HAL Audio Policy Configuration file -->
+<module name="sysbta" halVersion="2.0">
+    <mixPorts>
+        <!-- A2DP Audio Ports -->
+        <mixPort name="a2dp output" role="source"/>
+        <!-- Hearing AIDs Audio Ports -->
+        <mixPort name="hearing aid output" role="source">
+            <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                     samplingRates="24000 16000"
+                     channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
+        </mixPort>
+    </mixPorts>
+    <devicePorts>
+        <!-- A2DP Audio Ports -->
+        <devicePort tagName="BT A2DP Out" type="AUDIO_DEVICE_OUT_BLUETOOTH_A2DP" role="sink">
+            <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                     samplingRates="44100 48000 88200 96000"
+                     channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
+        </devicePort>
+        <devicePort tagName="BT A2DP Headphones" type="AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES" role="sink">
+            <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                     samplingRates="44100 48000 88200 96000"
+                     channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
+        </devicePort>
+        <devicePort tagName="BT A2DP Speaker" type="AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER" role="sink">
+            <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                     samplingRates="44100 48000 88200 96000"
+                     channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
+        </devicePort>
+        <!-- Hearing AIDs Audio Ports -->
+        <devicePort tagName="BT Hearing Aid Out" type="AUDIO_DEVICE_OUT_HEARING_AID" role="sink"/>
+    </devicePorts>
+    <routes>
+        <route type="mix" sink="BT A2DP Out"
+               sources="a2dp output"/>
+        <route type="mix" sink="BT A2DP Headphones"
+               sources="a2dp output"/>
+        <route type="mix" sink="BT A2DP Speaker"
+               sources="a2dp output"/>
+        <route type="mix" sink="BT Hearing Aid Out"
+               sources="hearing aid output"/>
+    </routes>
+</module>

bluetooth/audio/hal/A2dpOffloadAudioProvider.cpp

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioProviderA2dpHW"
+
+#include "A2dpOffloadAudioProvider.h"
+
+#include <BluetoothAudioCodecs.h>
+#include <BluetoothAudioSessionReport.h>
+#include <android-base/logging.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+A2dpOffloadEncodingAudioProvider::A2dpOffloadEncodingAudioProvider()
+    : A2dpOffloadAudioProvider() {
+  session_type_ = SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH;
+}
+
+A2dpOffloadDecodingAudioProvider::A2dpOffloadDecodingAudioProvider()
+    : A2dpOffloadAudioProvider() {
+  session_type_ = SessionType::A2DP_HARDWARE_OFFLOAD_DECODING_DATAPATH;
+}
+
+A2dpOffloadAudioProvider::A2dpOffloadAudioProvider() {}
+
+bool A2dpOffloadAudioProvider::isValid(const SessionType& session_type) {
+  return (session_type == session_type_);
+}
+
+ndk::ScopedAStatus A2dpOffloadAudioProvider::startSession(
+    const std::shared_ptr<IBluetoothAudioPort>& host_if,
+    const AudioConfiguration& audio_config,
+    const std::vector<LatencyMode>& latency_modes, DataMQDesc* _aidl_return) {
+  if (audio_config.getTag() != AudioConfiguration::a2dpConfig) {
+    LOG(WARNING) << __func__ << " - Invalid Audio Configuration="
+                 << audio_config.toString();
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  if (!BluetoothAudioCodecs::IsOffloadCodecConfigurationValid(
+          session_type_, audio_config.get<AudioConfiguration::a2dpConfig>())) {
+    LOG(WARNING) << __func__ << " - Invalid Audio Configuration="
+                 << audio_config.toString();
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  return BluetoothAudioProvider::startSession(
+      host_if, audio_config, latency_modes, _aidl_return);
+}
+
+ndk::ScopedAStatus A2dpOffloadAudioProvider::onSessionReady(
+    DataMQDesc* _aidl_return) {
+  *_aidl_return = DataMQDesc();
+  BluetoothAudioSessionReport::OnSessionStarted(
+      session_type_, stack_iface_, nullptr, *audio_config_, latency_modes_);
+  return ndk::ScopedAStatus::ok();
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/A2dpOffloadAudioProvider.h

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioProvider.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class A2dpOffloadAudioProvider : public BluetoothAudioProvider {
+ public:
+  A2dpOffloadAudioProvider();
+
+  bool isValid(const SessionType& session_type) override;
+
+  ndk::ScopedAStatus startSession(
+      const std::shared_ptr<IBluetoothAudioPort>& host_if,
+      const AudioConfiguration& audio_config,
+      const std::vector<LatencyMode>& latency_modes,
+      DataMQDesc* _aidl_return);
+
+ private:
+  ndk::ScopedAStatus onSessionReady(DataMQDesc* _aidl_return) override;
+};
+
+class A2dpOffloadEncodingAudioProvider : public A2dpOffloadAudioProvider {
+ public:
+  A2dpOffloadEncodingAudioProvider();
+};
+
+class A2dpOffloadDecodingAudioProvider : public A2dpOffloadAudioProvider {
+ public:
+  A2dpOffloadDecodingAudioProvider();
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/A2dpSoftwareAudioProvider.cpp

@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioProviderA2dpSW"
+
+#include "A2dpSoftwareAudioProvider.h"
+
+#include <BluetoothAudioCodecs.h>
+#include <BluetoothAudioSessionReport.h>
+#include <android-base/logging.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+// Here the buffer size is based on SBC
+static constexpr uint32_t kPcmFrameSize = 4;  // 16 bits per sample / stereo
+// SBC is 128, and here we choose the LCM of 16, 24, and 32
+static constexpr uint32_t kPcmFrameCount = 96;
+static constexpr uint32_t kRtpFrameSize = kPcmFrameSize * kPcmFrameCount;
+// The max counts by 1 tick (20ms) for SBC is about 7. Since using 96 for the
+// PCM counts, here we just choose a greater number
+static constexpr uint32_t kRtpFrameCount = 10;
+static constexpr uint32_t kBufferSize = kRtpFrameSize * kRtpFrameCount;
+static constexpr uint32_t kBufferCount = 2;  // double buffer
+static constexpr uint32_t kDataMqSize = kBufferSize * kBufferCount;
+
+A2dpSoftwareEncodingAudioProvider::A2dpSoftwareEncodingAudioProvider()
+    : A2dpSoftwareAudioProvider() {
+  session_type_ = SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH;
+}
+
+A2dpSoftwareDecodingAudioProvider::A2dpSoftwareDecodingAudioProvider()
+    : A2dpSoftwareAudioProvider() {
+  session_type_ = SessionType::A2DP_SOFTWARE_DECODING_DATAPATH;
+}
+
+A2dpSoftwareAudioProvider::A2dpSoftwareAudioProvider()
+    : BluetoothAudioProvider(), data_mq_(nullptr) {
+  LOG(INFO) << __func__ << " - size of audio buffer " << kDataMqSize
+            << " byte(s)";
+  std::unique_ptr<DataMQ> data_mq(
+      new DataMQ(kDataMqSize, /* EventFlag */ true));
+  if (data_mq && data_mq->isValid()) {
+    data_mq_ = std::move(data_mq);
+  } else {
+    ALOGE_IF(!data_mq, "failed to allocate data MQ");
+    ALOGE_IF(data_mq && !data_mq->isValid(), "data MQ is invalid");
+  }
+}
+
+bool A2dpSoftwareAudioProvider::isValid(const SessionType& sessionType) {
+  return (sessionType == session_type_ && data_mq_ && data_mq_->isValid());
+}
+
+ndk::ScopedAStatus A2dpSoftwareAudioProvider::startSession(
+    const std::shared_ptr<IBluetoothAudioPort>& host_if,
+    const AudioConfiguration& audio_config,
+    const std::vector<LatencyMode>& latency_modes, DataMQDesc* _aidl_return) {
+  if (audio_config.getTag() != AudioConfiguration::pcmConfig) {
+    LOG(WARNING) << __func__ << " - Invalid Audio Configuration="
+                 << audio_config.toString();
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  const PcmConfiguration& pcm_config =
+      audio_config.get<AudioConfiguration::pcmConfig>();
+  if (!BluetoothAudioCodecs::IsSoftwarePcmConfigurationValid(pcm_config)) {
+    LOG(WARNING) << __func__ << " - Unsupported PCM Configuration="
+                 << pcm_config.toString();
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+
+  return BluetoothAudioProvider::startSession(
+      host_if, audio_config, latency_modes, _aidl_return);
+}
+
+ndk::ScopedAStatus A2dpSoftwareAudioProvider::onSessionReady(
+    DataMQDesc* _aidl_return) {
+  if (data_mq_ == nullptr || !data_mq_->isValid()) {
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  *_aidl_return = data_mq_->dupeDesc();
+  auto desc = data_mq_->dupeDesc();
+  BluetoothAudioSessionReport::OnSessionStarted(
+      session_type_, stack_iface_, &desc, *audio_config_, latency_modes_);
+  return ndk::ScopedAStatus::ok();
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/A2dpSoftwareAudioProvider.h

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioProvider.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class A2dpSoftwareAudioProvider : public BluetoothAudioProvider {
+ public:
+  A2dpSoftwareAudioProvider();
+
+  bool isValid(const SessionType& sessionType) override;
+
+  ndk::ScopedAStatus startSession(
+      const std::shared_ptr<IBluetoothAudioPort>& host_if,
+      const AudioConfiguration& audio_config,
+      const std::vector<LatencyMode>& latency_modes,
+      DataMQDesc* _aidl_return);
+
+ private:
+  // audio data queue for software encoding
+  std::unique_ptr<DataMQ> data_mq_;
+
+  ndk::ScopedAStatus onSessionReady(DataMQDesc* _aidl_return) override;
+};
+
+class A2dpSoftwareEncodingAudioProvider : public A2dpSoftwareAudioProvider {
+ public:
+  A2dpSoftwareEncodingAudioProvider();
+};
+
+class A2dpSoftwareDecodingAudioProvider : public A2dpSoftwareAudioProvider {
+ public:
+  A2dpSoftwareDecodingAudioProvider();
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/Android.bp

@@ -0,0 +1,40 @@
+cc_binary {
+    name: "android.hardware.bluetooth.audio-service-system",
+    vintf_fragments: ["bluetooth_audio_system.xml"],
+    init_rc: ["android.hardware.bluetooth.audio-service-system.rc"],
+    relative_install_path: "hw",
+    srcs: [
+        "BluetoothAudioProvider.cpp",
+        "BluetoothAudioProviderFactory.cpp",
+        "A2dpOffloadAudioProvider.cpp",
+        "A2dpSoftwareAudioProvider.cpp",
+        "HearingAidAudioProvider.cpp",
+        "LeAudioOffloadAudioProvider.cpp",
+        "LeAudioSoftwareAudioProvider.cpp",
+        "service_system.cpp",
+    ],
+    header_libs: [
+        "libhardware_headers",
+    ],
+    shared_libs: [
+        "libbase",
+        "libbinder",
+        "libbinder_ndk",
+        "libcutils",
+        "libfmq",
+        "libhidlbase",
+        "liblog",
+        "libutils",
+        "android.hardware.bluetooth.audio-V2-ndk",
+        "libbluetooth_audio_session_aidl_system",
+    ],
+    required: [
+        // Audio HAL impls
+        "android.hardware.audio@2.0-impl-system",
+        "android.hardware.audio@4.0-impl-system",
+        "android.hardware.audio@5.0-impl-system",
+        "android.hardware.audio@6.0-impl-system",
+        "android.hardware.audio@7.0-impl-system",
+        "android.hardware.audio@7.1-impl-system",
+    ],
+}

bluetooth/audio/hal/BluetoothAudioProvider.cpp

@@ -0,0 +1,161 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioProviderStub"
+
+#include "BluetoothAudioProvider.h"
+
+#include <BluetoothAudioSessionReport.h>
+#include <android-base/logging.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+BluetoothAudioProvider::BluetoothAudioProvider() {
+  death_recipient_ = ::ndk::ScopedAIBinder_DeathRecipient(
+      AIBinder_DeathRecipient_new(binderDiedCallbackAidl));
+}
+
+ndk::ScopedAStatus BluetoothAudioProvider::startSession(
+    const std::shared_ptr<IBluetoothAudioPort>& host_if,
+    const AudioConfiguration& audio_config,
+    const std::vector<LatencyMode>& latencyModes,
+    DataMQDesc* _aidl_return) {
+  if (host_if == nullptr) {
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+
+  latency_modes_ = latencyModes;
+  audio_config_ = std::make_unique<AudioConfiguration>(audio_config);
+  stack_iface_ = host_if;
+  is_binder_died = false;
+
+  AIBinder_linkToDeath(stack_iface_->asBinder().get(), death_recipient_.get(),
+                       this);
+
+  onSessionReady(_aidl_return);
+  return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus BluetoothAudioProvider::endSession() {
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_);
+
+  if (stack_iface_ != nullptr) {
+    BluetoothAudioSessionReport::OnSessionEnded(session_type_);
+
+    if (!is_binder_died) {
+      AIBinder_unlinkToDeath(stack_iface_->asBinder().get(),
+                             death_recipient_.get(), this);
+    }
+  } else {
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << " has NO session";
+  }
+
+  stack_iface_ = nullptr;
+  audio_config_ = nullptr;
+
+  return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus BluetoothAudioProvider::streamStarted(
+    BluetoothAudioStatus status) {
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+            << ", status=" << toString(status);
+
+  if (stack_iface_ != nullptr) {
+    BluetoothAudioSessionReport::ReportControlStatus(session_type_, true,
+                                                     status);
+  } else {
+    LOG(WARNING) << __func__ << " - SessionType=" << toString(session_type_)
+                 << ", status=" << toString(status) << " has NO session";
+  }
+
+  return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus BluetoothAudioProvider::streamSuspended(
+    BluetoothAudioStatus status) {
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+            << ", status=" << toString(status);
+
+  if (stack_iface_ != nullptr) {
+    BluetoothAudioSessionReport::ReportControlStatus(session_type_, false,
+                                                     status);
+  } else {
+    LOG(WARNING) << __func__ << " - SessionType=" << toString(session_type_)
+                 << ", status=" << toString(status) << " has NO session";
+  }
+  return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus BluetoothAudioProvider::updateAudioConfiguration(
+    const AudioConfiguration& audio_config) {
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_);
+
+  if (stack_iface_ == nullptr || audio_config_ == nullptr) {
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << " has NO session";
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+
+  if (audio_config.getTag() != audio_config_->getTag()) {
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << " audio config type is not match";
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+
+  audio_config_ = std::make_unique<AudioConfiguration>(audio_config);
+  BluetoothAudioSessionReport::ReportAudioConfigChanged(session_type_,
+                                                        *audio_config_);
+  return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus BluetoothAudioProvider::setLowLatencyModeAllowed(
+    bool allowed) {
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_);
+
+  if (stack_iface_ == nullptr) {
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << " has NO session";
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  LOG(INFO) << __func__ << " - allowed " << allowed;
+  BluetoothAudioSessionReport::ReportLowLatencyModeAllowedChanged(
+    session_type_, allowed);
+  return ndk::ScopedAStatus::ok();
+}
+
+void BluetoothAudioProvider::binderDiedCallbackAidl(void* ptr) {
+  LOG(ERROR) << __func__ << " - BluetoothAudio Service died";
+  auto provider = static_cast<BluetoothAudioProvider*>(ptr);
+  if (provider == nullptr) {
+    LOG(ERROR) << __func__ << ": Null AudioProvider HAL died";
+    return;
+  }
+  provider->is_binder_died = true;
+  provider->endSession();
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/BluetoothAudioProvider.h

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include <aidl/android/hardware/bluetooth/audio/BnBluetoothAudioProvider.h>
+#include <aidl/android/hardware/bluetooth/audio/LatencyMode.h>
+#include <aidl/android/hardware/bluetooth/audio/SessionType.h>
+#include <fmq/AidlMessageQueue.h>
+
+using ::aidl::android::hardware::common::fmq::MQDescriptor;
+using ::aidl::android::hardware::common::fmq::SynchronizedReadWrite;
+using ::android::AidlMessageQueue;
+
+using MqDataType = int8_t;
+using MqDataMode = SynchronizedReadWrite;
+using DataMQ = AidlMessageQueue<MqDataType, MqDataMode>;
+using DataMQDesc = MQDescriptor<MqDataType, MqDataMode>;
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioProvider : public BnBluetoothAudioProvider {
+ public:
+  BluetoothAudioProvider();
+  ndk::ScopedAStatus startSession(
+      const std::shared_ptr<IBluetoothAudioPort>& host_if,
+      const AudioConfiguration& audio_config,
+      const std::vector<LatencyMode>& latency_modes,
+      DataMQDesc* _aidl_return);
+  ndk::ScopedAStatus endSession();
+  ndk::ScopedAStatus streamStarted(BluetoothAudioStatus status);
+  ndk::ScopedAStatus streamSuspended(BluetoothAudioStatus status);
+  ndk::ScopedAStatus updateAudioConfiguration(
+      const AudioConfiguration& audio_config);
+  ndk::ScopedAStatus setLowLatencyModeAllowed(bool allowed);
+
+  virtual bool isValid(const SessionType& sessionType) = 0;
+
+ protected:
+  virtual ndk::ScopedAStatus onSessionReady(DataMQDesc* _aidl_return) = 0;
+  static void binderDiedCallbackAidl(void* cookie_ptr);
+
+  ::ndk::ScopedAIBinder_DeathRecipient death_recipient_;
+
+  std::shared_ptr<IBluetoothAudioPort> stack_iface_;
+  std::unique_ptr<AudioConfiguration> audio_config_ = nullptr;
+  SessionType session_type_;
+  std::vector<LatencyMode> latency_modes_;
+  bool is_binder_died = false;
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/BluetoothAudioProviderFactory.cpp

@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioProviderFactoryAIDL"
+
+#include "BluetoothAudioProviderFactory.h"
+
+#include <BluetoothAudioCodecs.h>
+#include <android-base/logging.h>
+
+#include "A2dpOffloadAudioProvider.h"
+#include "A2dpSoftwareAudioProvider.h"
+#include "BluetoothAudioProvider.h"
+#include "HearingAidAudioProvider.h"
+#include "LeAudioOffloadAudioProvider.h"
+#include "LeAudioSoftwareAudioProvider.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+BluetoothAudioProviderFactory::BluetoothAudioProviderFactory() {}
+
+ndk::ScopedAStatus BluetoothAudioProviderFactory::openProvider(
+    const SessionType session_type,
+    std::shared_ptr<IBluetoothAudioProvider>* _aidl_return) {
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type);
+  std::shared_ptr<BluetoothAudioProvider> provider = nullptr;
+
+  switch (session_type) {
+    case SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH:
+      provider = ndk::SharedRefBase::make<A2dpSoftwareEncodingAudioProvider>();
+      break;
+    case SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH:
+      provider = ndk::SharedRefBase::make<A2dpOffloadEncodingAudioProvider>();
+      break;
+    case SessionType::HEARING_AID_SOFTWARE_ENCODING_DATAPATH:
+      provider = ndk::SharedRefBase::make<HearingAidAudioProvider>();
+      break;
+    case SessionType::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH:
+      provider = ndk::SharedRefBase::make<LeAudioSoftwareOutputAudioProvider>();
+      break;
+    case SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH:
+      provider = ndk::SharedRefBase::make<LeAudioOffloadOutputAudioProvider>();
+      break;
+    case SessionType::LE_AUDIO_SOFTWARE_DECODING_DATAPATH:
+      provider = ndk::SharedRefBase::make<LeAudioSoftwareInputAudioProvider>();
+      break;
+    case SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH:
+      provider = ndk::SharedRefBase::make<LeAudioOffloadInputAudioProvider>();
+      break;
+    case SessionType::LE_AUDIO_BROADCAST_SOFTWARE_ENCODING_DATAPATH:
+      provider =
+          ndk::SharedRefBase::make<LeAudioSoftwareBroadcastAudioProvider>();
+      break;
+    case SessionType::LE_AUDIO_BROADCAST_HARDWARE_OFFLOAD_ENCODING_DATAPATH:
+      provider =
+          ndk::SharedRefBase::make<LeAudioOffloadBroadcastAudioProvider>();
+      break;
+    case SessionType::A2DP_SOFTWARE_DECODING_DATAPATH:
+      provider = ndk::SharedRefBase::make<A2dpSoftwareDecodingAudioProvider>();
+      break;
+    case SessionType::A2DP_HARDWARE_OFFLOAD_DECODING_DATAPATH:
+      provider = ndk::SharedRefBase::make<A2dpOffloadDecodingAudioProvider>();
+      break;
+    default:
+      provider = nullptr;
+      break;
+  }
+
+  if (provider == nullptr || !provider->isValid(session_type)) {
+    provider = nullptr;
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type);
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  *_aidl_return = provider;
+
+  return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus BluetoothAudioProviderFactory::getProviderCapabilities(
+    const SessionType session_type,
+    std::vector<AudioCapabilities>* _aidl_return) {
+  if (session_type == SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+      session_type == SessionType::A2DP_HARDWARE_OFFLOAD_DECODING_DATAPATH) {
+    auto codec_capabilities =
+        BluetoothAudioCodecs::GetA2dpOffloadCodecCapabilities(session_type);
+    _aidl_return->resize(codec_capabilities.size());
+    for (int i = 0; i < codec_capabilities.size(); i++) {
+      _aidl_return->at(i).set<AudioCapabilities::a2dpCapabilities>(
+          codec_capabilities[i]);
+    }
+  } else if (session_type ==
+                 SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+             session_type ==
+                 SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH ||
+             session_type ==
+                 SessionType::
+                     LE_AUDIO_BROADCAST_HARDWARE_OFFLOAD_ENCODING_DATAPATH) {
+    std::vector<LeAudioCodecCapabilitiesSetting> db_codec_capabilities =
+        BluetoothAudioCodecs::GetLeAudioOffloadCodecCapabilities(session_type);
+    if (db_codec_capabilities.size()) {
+      _aidl_return->resize(db_codec_capabilities.size());
+      for (int i = 0; i < db_codec_capabilities.size(); ++i) {
+        _aidl_return->at(i).set<AudioCapabilities::leAudioCapabilities>(
+            db_codec_capabilities[i]);
+      }
+    }
+  } else if (session_type != SessionType::UNKNOWN) {
+    auto pcm_capabilities = BluetoothAudioCodecs::GetSoftwarePcmCapabilities();
+    _aidl_return->resize(pcm_capabilities.size());
+    for (int i = 0; i < pcm_capabilities.size(); i++) {
+      _aidl_return->at(i).set<AudioCapabilities::pcmCapabilities>(
+          pcm_capabilities[i]);
+    }
+  }
+
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type)
+            << " supports " << _aidl_return->size() << " codecs";
+  return ndk::ScopedAStatus::ok();
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/BluetoothAudioProviderFactory.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <aidl/android/hardware/bluetooth/audio/BnBluetoothAudioProviderFactory.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioProviderFactory : public BnBluetoothAudioProviderFactory {
+ public:
+  BluetoothAudioProviderFactory();
+
+  ndk::ScopedAStatus openProvider(
+      const SessionType session_type,
+      std::shared_ptr<IBluetoothAudioProvider>* _aidl_return) override;
+
+  ndk::ScopedAStatus getProviderCapabilities(
+      const SessionType session_type,
+      std::vector<AudioCapabilities>* _aidl_return) override;
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/HearingAidAudioProvider.cpp

@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioProviderHearingAid"
+
+#include "HearingAidAudioProvider.h"
+
+#include <BluetoothAudioCodecs.h>
+#include <BluetoothAudioSessionReport.h>
+#include <android-base/logging.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+static constexpr uint32_t kPcmFrameSize = 4;  // 16 bits per sample / stereo
+static constexpr uint32_t kPcmFrameCount = 128;
+static constexpr uint32_t kRtpFrameSize = kPcmFrameSize * kPcmFrameCount;
+static constexpr uint32_t kRtpFrameCount = 7;  // max counts by 1 tick (20ms)
+static constexpr uint32_t kBufferSize = kRtpFrameSize * kRtpFrameCount;
+static constexpr uint32_t kBufferCount = 1;  // single buffer
+static constexpr uint32_t kDataMqSize = kBufferSize * kBufferCount;
+
+HearingAidAudioProvider::HearingAidAudioProvider()
+    : BluetoothAudioProvider(), data_mq_(nullptr) {
+  LOG(INFO) << __func__ << " - size of audio buffer " << kDataMqSize
+            << " byte(s)";
+  std::unique_ptr<DataMQ> data_mq(
+      new DataMQ(kDataMqSize, /* EventFlag */ true));
+  if (data_mq && data_mq->isValid()) {
+    data_mq_ = std::move(data_mq);
+    session_type_ = SessionType::HEARING_AID_SOFTWARE_ENCODING_DATAPATH;
+  } else {
+    ALOGE_IF(!data_mq, "failed to allocate data MQ");
+    ALOGE_IF(data_mq && !data_mq->isValid(), "data MQ is invalid");
+  }
+}
+bool HearingAidAudioProvider::isValid(const SessionType& sessionType) {
+  return (sessionType == session_type_ && data_mq_ && data_mq_->isValid());
+}
+
+ndk::ScopedAStatus HearingAidAudioProvider::startSession(
+    const std::shared_ptr<IBluetoothAudioPort>& host_if,
+    const AudioConfiguration& audio_config,
+    const std::vector<LatencyMode>& latency_modes, DataMQDesc* _aidl_return) {
+  if (audio_config.getTag() != AudioConfiguration::pcmConfig) {
+    LOG(WARNING) << __func__ << " - Invalid Audio Configuration="
+                 << audio_config.toString();
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  const auto& pcm_config = audio_config.get<AudioConfiguration::pcmConfig>();
+  if (!BluetoothAudioCodecs::IsSoftwarePcmConfigurationValid(pcm_config)) {
+    LOG(WARNING) << __func__ << " - Unsupported PCM Configuration="
+                 << pcm_config.toString();
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+
+  return BluetoothAudioProvider::startSession(
+      host_if, audio_config, latency_modes, _aidl_return);
+}
+
+ndk::ScopedAStatus HearingAidAudioProvider::onSessionReady(
+    DataMQDesc* _aidl_return) {
+  if (data_mq_ == nullptr || !data_mq_->isValid()) {
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  *_aidl_return = data_mq_->dupeDesc();
+  auto desc = data_mq_->dupeDesc();
+  BluetoothAudioSessionReport::OnSessionStarted(
+      session_type_, stack_iface_, &desc, *audio_config_, latency_modes_);
+  return ndk::ScopedAStatus::ok();
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/HearingAidAudioProvider.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioProvider.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class HearingAidAudioProvider : public BluetoothAudioProvider {
+ public:
+  HearingAidAudioProvider();
+
+  bool isValid(const SessionType& sessionType) override;
+
+  ndk::ScopedAStatus startSession(
+      const std::shared_ptr<IBluetoothAudioPort>& host_if,
+      const AudioConfiguration& audio_config,
+      const std::vector<LatencyMode>& latency_modes,
+      DataMQDesc* _aidl_return);
+
+ private:
+  // audio data queue for software encoding
+  std::unique_ptr<DataMQ> data_mq_;
+
+  ndk::ScopedAStatus onSessionReady(DataMQDesc* _aidl_return) override;
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/LeAudioOffloadAudioProvider.cpp

@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioProviderLeAudioHW"
+
+#include "LeAudioOffloadAudioProvider.h"
+
+#include <BluetoothAudioCodecs.h>
+#include <BluetoothAudioSessionReport.h>
+#include <android-base/logging.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+LeAudioOffloadOutputAudioProvider::LeAudioOffloadOutputAudioProvider()
+    : LeAudioOffloadAudioProvider() {
+  session_type_ = SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH;
+}
+
+LeAudioOffloadInputAudioProvider::LeAudioOffloadInputAudioProvider()
+    : LeAudioOffloadAudioProvider() {
+  session_type_ = SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH;
+}
+
+LeAudioOffloadBroadcastAudioProvider::LeAudioOffloadBroadcastAudioProvider()
+    : LeAudioOffloadAudioProvider() {
+  session_type_ =
+      SessionType::LE_AUDIO_BROADCAST_HARDWARE_OFFLOAD_ENCODING_DATAPATH;
+}
+
+LeAudioOffloadAudioProvider::LeAudioOffloadAudioProvider()
+    : BluetoothAudioProvider() {}
+
+bool LeAudioOffloadAudioProvider::isValid(const SessionType& sessionType) {
+  return (sessionType == session_type_);
+}
+
+ndk::ScopedAStatus LeAudioOffloadAudioProvider::startSession(
+    const std::shared_ptr<IBluetoothAudioPort>& host_if,
+    const AudioConfiguration& audio_config,
+    const std::vector<LatencyMode>& latency_modes, DataMQDesc* _aidl_return) {
+  if (audio_config.getTag() != AudioConfiguration::leAudioConfig) {
+    LOG(WARNING) << __func__ << " - Invalid Audio Configuration="
+                 << audio_config.toString();
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  const auto& le_audio_config =
+      audio_config.get<AudioConfiguration::leAudioConfig>();
+  if (!BluetoothAudioCodecs::IsOffloadLeAudioConfigurationValid(
+          session_type_, le_audio_config)) {
+    LOG(WARNING) << __func__ << " - Unsupported LC3 Offloaded Configuration="
+                 << le_audio_config.toString();
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+
+  return BluetoothAudioProvider::startSession(
+      host_if, audio_config, latency_modes, _aidl_return);
+}
+
+ndk::ScopedAStatus LeAudioOffloadAudioProvider::onSessionReady(
+    DataMQDesc* _aidl_return) {
+  BluetoothAudioSessionReport::OnSessionStarted(
+      session_type_, stack_iface_, nullptr, *audio_config_, latency_modes_);
+  *_aidl_return = DataMQDesc();
+  return ndk::ScopedAStatus::ok();
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/LeAudioOffloadAudioProvider.h

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioProvider.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class LeAudioOffloadAudioProvider : public BluetoothAudioProvider {
+ public:
+  LeAudioOffloadAudioProvider();
+
+  bool isValid(const SessionType& sessionType) override;
+
+  ndk::ScopedAStatus startSession(
+      const std::shared_ptr<IBluetoothAudioPort>& host_if,
+      const AudioConfiguration& audio_config,
+      const std::vector<LatencyMode>& latency_modes,
+      DataMQDesc* _aidl_return);
+
+ private:
+  ndk::ScopedAStatus onSessionReady(DataMQDesc* _aidl_return) override;
+};
+
+class LeAudioOffloadOutputAudioProvider : public LeAudioOffloadAudioProvider {
+ public:
+  LeAudioOffloadOutputAudioProvider();
+};
+
+class LeAudioOffloadInputAudioProvider : public LeAudioOffloadAudioProvider {
+ public:
+  LeAudioOffloadInputAudioProvider();
+};
+
+class LeAudioOffloadBroadcastAudioProvider
+    : public LeAudioOffloadAudioProvider {
+ public:
+  LeAudioOffloadBroadcastAudioProvider();
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/LeAudioSoftwareAudioProvider.cpp

@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioProviderLeAudioSW"
+
+#include "LeAudioSoftwareAudioProvider.h"
+
+#include <BluetoothAudioCodecs.h>
+#include <BluetoothAudioSessionReport.h>
+#include <android-base/logging.h>
+
+#include <cstdint>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+static constexpr uint32_t kBufferOutCount = 2;  // two frame buffer
+static constexpr uint32_t kBufferInCount = 2;   // two frame buffer
+
+inline uint32_t channel_mode_to_channel_count(ChannelMode channel_mode) {
+  switch (channel_mode) {
+    case ChannelMode::MONO:
+      return 1;
+    case ChannelMode::STEREO:
+      return 2;
+    default:
+      return 0;
+  }
+  return 0;
+}
+
+LeAudioSoftwareOutputAudioProvider::LeAudioSoftwareOutputAudioProvider()
+    : LeAudioSoftwareAudioProvider() {
+  session_type_ = SessionType::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH;
+}
+
+LeAudioSoftwareInputAudioProvider::LeAudioSoftwareInputAudioProvider()
+    : LeAudioSoftwareAudioProvider() {
+  session_type_ = SessionType::LE_AUDIO_SOFTWARE_DECODING_DATAPATH;
+}
+
+LeAudioSoftwareBroadcastAudioProvider::LeAudioSoftwareBroadcastAudioProvider()
+    : LeAudioSoftwareAudioProvider() {
+  session_type_ = SessionType::LE_AUDIO_BROADCAST_SOFTWARE_ENCODING_DATAPATH;
+}
+
+LeAudioSoftwareAudioProvider::LeAudioSoftwareAudioProvider()
+    : BluetoothAudioProvider(), data_mq_(nullptr) {}
+
+bool LeAudioSoftwareAudioProvider::isValid(const SessionType& sessionType) {
+  return (sessionType == session_type_);
+}
+
+ndk::ScopedAStatus LeAudioSoftwareAudioProvider::startSession(
+    const std::shared_ptr<IBluetoothAudioPort>& host_if,
+    const AudioConfiguration& audio_config,
+    const std::vector<LatencyMode>& latency_modes, DataMQDesc* _aidl_return) {
+  if (audio_config.getTag() != AudioConfiguration::pcmConfig) {
+    LOG(WARNING) << __func__ << " - Invalid Audio Configuration="
+                 << audio_config.toString();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  const auto& pcm_config = audio_config.get<AudioConfiguration::pcmConfig>();
+  if (!BluetoothAudioCodecs::IsSoftwarePcmConfigurationValid(pcm_config)) {
+    LOG(WARNING) << __func__ << " - Unsupported PCM Configuration="
+                 << pcm_config.toString();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+
+  uint32_t buffer_modifier = 0;
+  if (session_type_ == SessionType::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH ||
+      session_type_ ==
+          SessionType::LE_AUDIO_BROADCAST_SOFTWARE_ENCODING_DATAPATH)
+    buffer_modifier = kBufferOutCount;
+  else if (session_type_ == SessionType::LE_AUDIO_SOFTWARE_DECODING_DATAPATH)
+    buffer_modifier = kBufferInCount;
+
+  // 24 bit audio stream is sent as unpacked
+  int bytes_per_sample =
+      (pcm_config.bitsPerSample == 24) ? 4 : (pcm_config.bitsPerSample / 8);
+
+  uint32_t data_mq_size =
+      (ceil(pcm_config.sampleRateHz) / 1000) *
+      channel_mode_to_channel_count(pcm_config.channelMode) * bytes_per_sample *
+      (pcm_config.dataIntervalUs / 1000) * buffer_modifier;
+  if (data_mq_size <= 0) {
+    LOG(ERROR) << __func__ << "Unexpected audio buffer size: " << data_mq_size
+               << ", SampleRateHz: " << pcm_config.sampleRateHz
+               << ", ChannelMode: " << toString(pcm_config.channelMode)
+               << ", BitsPerSample: "
+               << static_cast<int>(pcm_config.bitsPerSample)
+               << ", BytesPerSample: " << bytes_per_sample
+               << ", DataIntervalUs: " << pcm_config.dataIntervalUs
+               << ", SessionType: " << toString(session_type_);
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+
+  LOG(INFO) << __func__ << " - size of audio buffer " << data_mq_size
+            << " byte(s)";
+
+  std::unique_ptr<DataMQ> temp_data_mq(
+      new DataMQ(data_mq_size, /* EventFlag */ true));
+  if (temp_data_mq == nullptr || !temp_data_mq->isValid()) {
+    ALOGE_IF(!temp_data_mq, "failed to allocate data MQ");
+    ALOGE_IF(temp_data_mq && !temp_data_mq->isValid(), "data MQ is invalid");
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  data_mq_ = std::move(temp_data_mq);
+
+  return BluetoothAudioProvider::startSession(
+      host_if, audio_config, latency_modes, _aidl_return);
+}
+
+ndk::ScopedAStatus LeAudioSoftwareAudioProvider::onSessionReady(
+    DataMQDesc* _aidl_return) {
+  if (data_mq_ == nullptr || !data_mq_->isValid()) {
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  *_aidl_return = data_mq_->dupeDesc();
+  auto desc = data_mq_->dupeDesc();
+  BluetoothAudioSessionReport::OnSessionStarted(
+      session_type_, stack_iface_, &desc, *audio_config_, latency_modes_);
+  return ndk::ScopedAStatus::ok();
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/LeAudioSoftwareAudioProvider.h

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioProvider.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class LeAudioSoftwareAudioProvider : public BluetoothAudioProvider {
+ public:
+  LeAudioSoftwareAudioProvider();
+
+  bool isValid(const SessionType& sessionType) override;
+
+  ndk::ScopedAStatus startSession(
+      const std::shared_ptr<IBluetoothAudioPort>& host_if,
+      const AudioConfiguration& audio_config,
+      const std::vector<LatencyMode>& latency_modes,
+      DataMQDesc* _aidl_return);
+
+ private:
+  // audio data queue for software encoding
+  std::unique_ptr<DataMQ> data_mq_;
+
+  ndk::ScopedAStatus onSessionReady(DataMQDesc* _aidl_return) override;
+};
+
+class LeAudioSoftwareOutputAudioProvider : public LeAudioSoftwareAudioProvider {
+ public:
+  LeAudioSoftwareOutputAudioProvider();
+};
+
+class LeAudioSoftwareInputAudioProvider : public LeAudioSoftwareAudioProvider {
+ public:
+  LeAudioSoftwareInputAudioProvider();
+};
+
+class LeAudioSoftwareBroadcastAudioProvider
+    : public LeAudioSoftwareAudioProvider {
+ public:
+  LeAudioSoftwareBroadcastAudioProvider();
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/hal/android.hardware.bluetooth.audio-service-system.rc

@@ -0,0 +1,9 @@
+service system.bt-audio-hal /system/bin/hw/android.hardware.bluetooth.audio-service-system
+    class hal
+    user audioserver
+    # media gid needed for /dev/fm (radio) and for /data/misc/media (tee)
+    group audio camera drmrpc inet media mediadrm net_bt net_bt_admin net_bw_acct wakelock context_hub
+    capabilities BLOCK_SUSPEND
+    ioprio rt 4
+    task_profiles ProcessCapacityHigh HighPerformance
+    onrestart restart audioserver

bluetooth/audio/hal/bluetooth_audio_system.xml

@@ -0,0 +1,17 @@
+<manifest version="1.0" type="framework">
+    <hal format="aidl">
+        <name>android.hardware.bluetooth.audio</name>
+        <version>2</version>
+        <fqname>IBluetoothAudioProviderFactory/sysbta</fqname>
+    </hal>
+    <hal>
+        <name>android.hardware.audio</name>
+        <transport>hwbinder</transport>
+        <fqname>@2.0::IDevicesFactory/sysbta</fqname>
+        <fqname>@4.0::IDevicesFactory/sysbta</fqname>
+        <fqname>@5.0::IDevicesFactory/sysbta</fqname>
+        <fqname>@6.0::IDevicesFactory/sysbta</fqname>
+        <fqname>@7.0::IDevicesFactory/sysbta</fqname>
+        <fqname>@7.1::IDevicesFactory/sysbta</fqname>
+    </hal>
+</manifest>

bluetooth/audio/hal/service_system.cpp

@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BtAudioAIDLServiceSystem"
+
+#include <dlfcn.h>
+#include <signal.h>
+
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+#include <utils/Log.h>
+#include <hidl/HidlTransportSupport.h>
+#include <hwbinder/ProcessState.h>
+#include <binder/ProcessState.h>
+
+#include "BluetoothAudioProviderFactory.h"
+
+using ::aidl::android::hardware::bluetooth::audio::
+    BluetoothAudioProviderFactory;
+
+#if defined(__LP64__)
+#define HAL_LIBRARY_PATH "/system/lib64/hw"
+#else
+#define HAL_LIBRARY_PATH "/system/lib/hw"
+#endif
+
+void registerAudioInterfaces() {
+  const char *interface_libs[] = {
+    "android.hardware.audio@2.0-impl-system.so",
+    "android.hardware.audio@4.0-impl-system.so",
+    "android.hardware.audio@5.0-impl-system.so",
+    "android.hardware.audio@6.0-impl-system.so",
+    "android.hardware.audio@7.0-impl-system.so",
+    "android.hardware.audio@7.1-impl-system.so",
+  };
+
+  for (auto& lib : interface_libs) {
+    void* handle = dlopen((std::string() + HAL_LIBRARY_PATH + "/" + lib).c_str(), RTLD_NOW);
+    if (handle == nullptr) {
+      ALOGW("Failed to load %s, skipping", lib);
+      continue;
+    }
+
+    ::android::status_t (*entry_func)(const char*);
+    entry_func = reinterpret_cast<::android::status_t (*)(const char*)>(dlsym(handle, "createIDevicesFactory"));
+
+    if (entry_func == nullptr) {
+      ALOGW("Cannot find entry symbol in %s, skipping", lib);
+      continue;
+    }
+
+    ::android::status_t status = entry_func("sysbta");
+    ALOGW_IF(status != STATUS_OK, "Could not register sysbta for %s, status=%d", lib, status);
+  }
+}
+
+int main() {
+  signal(SIGPIPE, SIG_IGN);
+
+  ::android::hardware::configureRpcThreadpool(16, true);
+  ::android::ProcessState::initWithDriver("/dev/binder");
+  // start a threadpool for binder / hwbinder interactions
+  ::android::ProcessState::self()->startThreadPool();
+  ::android::hardware::ProcessState::self()->startThreadPool();
+
+  auto factory = ::ndk::SharedRefBase::make<BluetoothAudioProviderFactory>();
+  const std::string instance_name =
+      std::string() + BluetoothAudioProviderFactory::descriptor + "/sysbta";
+  binder_status_t aidl_status = AServiceManager_addService(
+      factory->asBinder().get(), instance_name.c_str());
+  ALOGW_IF(aidl_status != STATUS_OK, "Could not register %s, status=%d",
+           instance_name.c_str(), aidl_status);
+
+  // We must also implement audio HAL interfaces in order to serve audio.sysbta.default.so
+  // It must be served in the *same* process to access the same libbluetooth_audio_session
+  registerAudioInterfaces();
+
+  ::android::hardware::joinRpcThreadpool();
+}

bluetooth/audio/hw/Android.bp

@@ -0,0 +1,33 @@
+cc_library_shared {
+    name: "audio.sysbta.default",
+    relative_install_path: "hw",
+    srcs: [
+        "audio_bluetooth_hw.cc",
+        "stream_apis.cc",
+        "device_port_proxy.cc",
+        "device_port_proxy_hidl.cc",
+        "utils.cc",
+    ],
+    header_libs: ["libhardware_headers"],
+    shared_libs: [
+        "android.hardware.bluetooth.audio-V2-ndk",
+        "libbluetooth_audio_session_aidl_system",
+        "libaudioutils",
+        "libbase",
+        "libbinder_ndk",
+        "libcutils",
+        "libfmq",
+        "liblog",
+        "libutils",
+        // HIDL dependencies
+        "android.hardware.bluetooth.audio@2.0",
+        "android.hardware.bluetooth.audio@2.1",
+        "libbluetooth_audio_session_system",
+        "libhidlbase",
+    ],
+    cflags: [
+        "-Wall",
+        "-Werror",
+        "-Wno-unused-parameter",
+    ],
+}

bluetooth/audio/hw/audio_bluetooth_hw.cc

@@ -0,0 +1,161 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioHw"
+
+#include <android-base/logging.h>
+#include <errno.h>
+#include <hardware/hardware.h>
+#include <log/log.h>
+#include <malloc.h>
+#include <string.h>
+#include <system/audio.h>
+
+#include "stream_apis.h"
+#include "utils.h"
+
+using ::android::bluetooth::audio::utils::GetAudioParamString;
+using ::android::bluetooth::audio::utils::ParseAudioParams;
+
+static int adev_set_parameters(struct audio_hw_device* dev,
+                               const char* kvpairs) {
+  LOG(VERBOSE) << __func__ << ": kevpairs=[" << kvpairs << "]";
+  std::unordered_map<std::string, std::string> params =
+      ParseAudioParams(kvpairs);
+  if (params.empty()) return 0;
+
+  LOG(VERBOSE) << __func__ << ": ParamsMap=[" << GetAudioParamString(params)
+               << "]";
+  if (params.find("A2dpSuspended") == params.end()) {
+    return -ENOSYS;
+  }
+
+  auto* bluetooth_device = reinterpret_cast<BluetoothAudioDevice*>(dev);
+  std::lock_guard<std::mutex> guard(bluetooth_device->mutex_);
+  for (auto sout : bluetooth_device->opened_stream_outs_) {
+    if (sout->stream_out_.common.set_parameters != nullptr) {
+      sout->stream_out_.common.set_parameters(&sout->stream_out_.common,
+                                              kvpairs);
+    }
+  }
+  return 0;
+}
+
+static char* adev_get_parameters(const struct audio_hw_device* dev,
+                                 const char* keys) {
+  LOG(VERBOSE) << __func__ << ": keys=[" << keys << "]";
+  return strdup("");
+}
+
+static int adev_init_check(const struct audio_hw_device* dev) { return 0; }
+
+static int adev_set_voice_volume(struct audio_hw_device* dev, float volume) {
+  LOG(VERBOSE) << __func__ << ": volume=" << volume;
+  return -ENOSYS;
+}
+
+static int adev_set_master_volume(struct audio_hw_device* dev, float volume) {
+  LOG(VERBOSE) << __func__ << ": volume=" << volume;
+  return -ENOSYS;
+}
+
+static int adev_get_master_volume(struct audio_hw_device* dev, float* volume) {
+  return -ENOSYS;
+}
+
+static int adev_set_master_mute(struct audio_hw_device* dev, bool muted) {
+  LOG(VERBOSE) << __func__ << ": mute=" << muted;
+  return -ENOSYS;
+}
+
+static int adev_get_master_mute(struct audio_hw_device* dev, bool* muted) {
+  return -ENOSYS;
+}
+
+static int adev_set_mode(struct audio_hw_device* dev, audio_mode_t mode) {
+  LOG(VERBOSE) << __func__ << ": mode=" << mode;
+  return 0;
+}
+
+static int adev_set_mic_mute(struct audio_hw_device* dev, bool state) {
+  LOG(VERBOSE) << __func__ << ": state=" << state;
+  return -ENOSYS;
+}
+
+static int adev_get_mic_mute(const struct audio_hw_device* dev, bool* state) {
+  return -ENOSYS;
+}
+
+static int adev_dump(const audio_hw_device_t* device, int fd) { return 0; }
+
+static int adev_close(hw_device_t* device) {
+  auto* bluetooth_device = reinterpret_cast<BluetoothAudioDevice*>(device);
+  delete bluetooth_device;
+  return 0;
+}
+
+static int adev_open(const hw_module_t* module, const char* name,
+                     hw_device_t** device) {
+  LOG(VERBOSE) << __func__ << ": name=[" << name << "]";
+  if (strcmp(name, AUDIO_HARDWARE_INTERFACE) != 0) return -EINVAL;
+
+  auto bluetooth_audio_device = new BluetoothAudioDevice{};
+  struct audio_hw_device* adev = &bluetooth_audio_device->audio_device_;
+  if (!adev) return -ENOMEM;
+
+  adev->common.tag = HARDWARE_DEVICE_TAG;
+  adev->common.version = AUDIO_DEVICE_API_VERSION_2_0;
+  adev->common.module = (struct hw_module_t*)module;
+  adev->common.close = adev_close;
+
+  adev->init_check = adev_init_check;
+  adev->set_voice_volume = adev_set_voice_volume;
+  adev->set_master_volume = adev_set_master_volume;
+  adev->get_master_volume = adev_get_master_volume;
+  adev->set_mode = adev_set_mode;
+  adev->set_mic_mute = adev_set_mic_mute;
+  adev->get_mic_mute = adev_get_mic_mute;
+  adev->set_parameters = adev_set_parameters;
+  adev->get_parameters = adev_get_parameters;
+  adev->get_input_buffer_size = adev_get_input_buffer_size;
+  adev->open_output_stream = adev_open_output_stream;
+  adev->close_output_stream = adev_close_output_stream;
+  adev->open_input_stream = adev_open_input_stream;
+  adev->close_input_stream = adev_close_input_stream;
+  adev->dump = adev_dump;
+  adev->set_master_mute = adev_set_master_mute;
+  adev->get_master_mute = adev_get_master_mute;
+
+  *device = &adev->common;
+  return 0;
+}
+
+static struct hw_module_methods_t hal_module_methods = {
+    .open = adev_open,
+};
+
+struct audio_module HAL_MODULE_INFO_SYM = {
+    .common =
+        {
+            .tag = HARDWARE_MODULE_TAG,
+            .module_api_version = AUDIO_MODULE_API_VERSION_0_1,
+            .hal_api_version = HARDWARE_HAL_API_VERSION,
+            .id = AUDIO_HARDWARE_MODULE_ID,
+            .name = "Bluetooth Audio HW HAL",
+            .author = "The Android Open Source Project",
+            .methods = &hal_module_methods,
+        },
+};

bluetooth/audio/hw/device_port_proxy.cc

@@ -0,0 +1,618 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioHalDeviceProxyAIDL"
+
+#include "device_port_proxy.h"
+
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <audio_utils/primitives.h>
+#include <inttypes.h>
+#include <log/log.h>
+#include <stdlib.h>
+
+#include "BluetoothAudioSessionControl.h"
+#include "stream_apis.h"
+#include "utils.h"
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+namespace aidl {
+
+using ::aidl::android::hardware::bluetooth::audio::AudioConfiguration;
+using ::aidl::android::hardware::bluetooth::audio::BluetoothAudioSessionControl;
+using ::aidl::android::hardware::bluetooth::audio::ChannelMode;
+using ::aidl::android::hardware::bluetooth::audio::PcmConfiguration;
+using ::aidl::android::hardware::bluetooth::audio::PortStatusCallbacks;
+using ::aidl::android::hardware::bluetooth::audio::PresentationPosition;
+
+using ::android::base::StringPrintf;
+using ControlResultCallback = std::function<void(
+    uint16_t cookie, bool start_resp, const BluetoothAudioStatus& status)>;
+using SessionChangedCallback = std::function<void(uint16_t cookie)>;
+
+namespace {
+
+audio_channel_mask_t OutputChannelModeToAudioFormat(ChannelMode channel_mode) {
+  switch (channel_mode) {
+    case ChannelMode::MONO:
+      return AUDIO_CHANNEL_OUT_MONO;
+    case ChannelMode::STEREO:
+      return AUDIO_CHANNEL_OUT_STEREO;
+    default:
+      return kBluetoothDefaultOutputChannelModeMask;
+  }
+}
+
+audio_channel_mask_t InputChannelModeToAudioFormat(ChannelMode channel_mode) {
+  switch (channel_mode) {
+    case ChannelMode::MONO:
+      return AUDIO_CHANNEL_IN_MONO;
+    case ChannelMode::STEREO:
+      return AUDIO_CHANNEL_IN_STEREO;
+    default:
+      return kBluetoothDefaultInputChannelModeMask;
+  }
+}
+
+audio_format_t BitsPerSampleToAudioFormat(uint8_t bits_per_sample,
+                                          const SessionType& session_type) {
+  switch (bits_per_sample) {
+    case 16:
+      return AUDIO_FORMAT_PCM_16_BIT;
+    case 24:
+      /* Now we use knowledge that Classic sessions used packed, and LE Audio
+       * LC3 encoder uses unpacked as input. This should be passed as parameter
+       * from BT stack through AIDL, but it would require new interface version,
+       * so sticking with this workaround for now. */
+      if (session_type ==
+              SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+          session_type == SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH) {
+        return AUDIO_FORMAT_PCM_24_BIT_PACKED;
+      } else {
+        return AUDIO_FORMAT_PCM_8_24_BIT;
+      }
+    case 32:
+      return AUDIO_FORMAT_PCM_32_BIT;
+    default:
+      return kBluetoothDefaultAudioFormatBitsPerSample;
+  }
+}
+
+// The maximum time to wait in std::condition_variable::wait_for()
+constexpr unsigned int kMaxWaitingTimeMs = 4500;
+
+}  // namespace
+
+BluetoothAudioPortAidl::BluetoothAudioPortAidl()
+    : cookie_(::aidl::android::hardware::bluetooth::audio::
+                  kObserversCookieUndefined),
+      state_(BluetoothStreamState::DISABLED),
+      session_type_(SessionType::UNKNOWN) {}
+
+BluetoothAudioPortAidlOut::~BluetoothAudioPortAidlOut() {
+  if (in_use()) TearDown();
+}
+
+BluetoothAudioPortAidlIn::~BluetoothAudioPortAidlIn() {
+  if (in_use()) TearDown();
+}
+
+bool BluetoothAudioPortAidl::SetUp(audio_devices_t devices) {
+  if (!init_session_type(devices)) return false;
+
+  state_ = BluetoothStreamState::STANDBY;
+
+  auto control_result_cb = [port = this](uint16_t cookie, bool start_resp,
+                                         const BluetoothAudioStatus& status) {
+    if (!port->in_use()) {
+      LOG(ERROR) << "control_result_cb: BluetoothAudioPortAidl is not in use";
+      return;
+    }
+    if (port->cookie_ != cookie) {
+      LOG(ERROR) << "control_result_cb: proxy of device port (cookie="
+                 << StringPrintf("%#hx", cookie) << ") is corrupted";
+      return;
+    }
+    port->ControlResultHandler(status);
+  };
+  auto session_changed_cb = [port = this](uint16_t cookie) {
+    if (!port->in_use()) {
+      LOG(ERROR) << "session_changed_cb: BluetoothAudioPortAidl is not in use";
+      return;
+    }
+    if (port->cookie_ != cookie) {
+      LOG(ERROR) << "session_changed_cb: proxy of device port (cookie="
+                 << StringPrintf("%#hx", cookie) << ") is corrupted";
+      return;
+    }
+    port->SessionChangedHandler();
+  };
+  // TODO: Add audio_config_changed_cb
+  PortStatusCallbacks cbacks = {
+      .control_result_cb_ = control_result_cb,
+      .session_changed_cb_ = session_changed_cb,
+  };
+  cookie_ = BluetoothAudioSessionControl::RegisterControlResultCback(
+      session_type_, cbacks);
+  LOG(INFO) << __func__ << ": session_type=" << toString(session_type_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_);
+
+  return (
+      cookie_ !=
+      ::aidl::android::hardware::bluetooth::audio::kObserversCookieUndefined);
+}
+
+bool BluetoothAudioPortAidl::init_session_type(audio_devices_t device) {
+  switch (device) {
+    case AUDIO_DEVICE_OUT_BLUETOOTH_A2DP:
+    case AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES:
+    case AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER:
+      LOG(VERBOSE)
+          << __func__
+          << ": device=AUDIO_DEVICE_OUT_BLUETOOTH_A2DP (HEADPHONES/SPEAKER) ("
+          << StringPrintf("%#x", device) << ")";
+      session_type_ = SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH;
+      break;
+    case AUDIO_DEVICE_OUT_HEARING_AID:
+      LOG(VERBOSE) << __func__
+                   << ": device=AUDIO_DEVICE_OUT_HEARING_AID (MEDIA/VOICE) ("
+                   << StringPrintf("%#x", device) << ")";
+      session_type_ = SessionType::HEARING_AID_SOFTWARE_ENCODING_DATAPATH;
+      break;
+    case AUDIO_DEVICE_OUT_BLE_HEADSET:
+      LOG(VERBOSE) << __func__
+                   << ": device=AUDIO_DEVICE_OUT_BLE_HEADSET (MEDIA/VOICE) ("
+                   << StringPrintf("%#x", device) << ")";
+      session_type_ = SessionType::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH;
+      break;
+    case AUDIO_DEVICE_OUT_BLE_SPEAKER:
+      LOG(VERBOSE) << __func__
+                   << ": device=AUDIO_DEVICE_OUT_BLE_SPEAKER (MEDIA) ("
+                   << StringPrintf("%#x", device) << ")";
+      session_type_ = SessionType::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH;
+      break;
+    case AUDIO_DEVICE_IN_BLE_HEADSET:
+      LOG(VERBOSE) << __func__
+                   << ": device=AUDIO_DEVICE_IN_BLE_HEADSET (VOICE) ("
+                   << StringPrintf("%#x", device) << ")";
+      session_type_ = SessionType::LE_AUDIO_SOFTWARE_DECODING_DATAPATH;
+      break;
+    case AUDIO_DEVICE_OUT_BLE_BROADCAST:
+      LOG(VERBOSE) << __func__
+                   << ": device=AUDIO_DEVICE_OUT_BLE_BROADCAST (MEDIA) ("
+                   << StringPrintf("%#x", device) << ")";
+      session_type_ =
+          SessionType::LE_AUDIO_BROADCAST_SOFTWARE_ENCODING_DATAPATH;
+      break;
+    default:
+      LOG(ERROR) << __func__
+                 << ": unknown device=" << StringPrintf("%#x", device);
+      return false;
+  }
+
+  if (!BluetoothAudioSessionControl::IsSessionReady(session_type_)) {
+    LOG(ERROR) << __func__ << ": device=" << StringPrintf("%#x", device)
+               << ", session_type=" << toString(session_type_)
+               << " is not ready";
+    return false;
+  }
+  return true;
+}
+
+void BluetoothAudioPortAidl::TearDown() {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": session_type=" << toString(session_type_)
+               << ", cookie=" << StringPrintf("%#hx", cookie_)
+               << " unknown monitor";
+    return;
+  }
+
+  LOG(INFO) << __func__ << ": session_type=" << toString(session_type_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_);
+  BluetoothAudioSessionControl::UnregisterControlResultCback(session_type_,
+                                                             cookie_);
+  cookie_ =
+      ::aidl::android::hardware::bluetooth::audio::kObserversCookieUndefined;
+}
+
+void BluetoothAudioPortAidl::ControlResultHandler(
+    const BluetoothAudioStatus& status) {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortAidlis not in use";
+    return;
+  }
+  std::unique_lock<std::mutex> port_lock(cv_mutex_);
+  BluetoothStreamState previous_state = state_;
+  LOG(INFO) << "control_result_cb: session_type=" << toString(session_type_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_)
+            << ", previous_state=" << previous_state
+            << ", status=" << toString(status);
+
+  switch (previous_state) {
+    case BluetoothStreamState::STARTED:
+      /* Only Suspend signal can be send in STARTED state*/
+      if (status == BluetoothAudioStatus::RECONFIGURATION ||
+          status == BluetoothAudioStatus::SUCCESS) {
+        state_ = BluetoothStreamState::STANDBY;
+      } else {
+        // Set to standby since the stack may be busy switching between outputs
+        LOG(WARNING) << "control_result_cb: status=" << toString(status)
+                     << " failure for session_type=" << toString(session_type_)
+                     << ", cookie=" << StringPrintf("%#hx", cookie_)
+                     << ", previous_state=" << previous_state;
+      }
+      break;
+    case BluetoothStreamState::STARTING:
+      if (status == BluetoothAudioStatus::SUCCESS) {
+        state_ = BluetoothStreamState::STARTED;
+      } else {
+        // Set to standby since the stack may be busy switching between outputs
+        LOG(WARNING) << "control_result_cb: status=" << toString(status)
+                     << " failure for session_type=" << toString(session_type_)
+                     << ", cookie=" << StringPrintf("%#hx", cookie_)
+                     << ", previous_state=" << previous_state;
+        state_ = BluetoothStreamState::STANDBY;
+      }
+      break;
+    case BluetoothStreamState::SUSPENDING:
+      if (status == BluetoothAudioStatus::SUCCESS) {
+        state_ = BluetoothStreamState::STANDBY;
+      } else {
+        // It will be failed if the headset is disconnecting, and set to disable
+        // to wait for re-init again
+        LOG(WARNING) << "control_result_cb: status=" << toString(status)
+                     << " failure for session_type=" << toString(session_type_)
+                     << ", cookie=" << StringPrintf("%#hx", cookie_)
+                     << ", previous_state=" << previous_state;
+        state_ = BluetoothStreamState::DISABLED;
+      }
+      break;
+    default:
+      LOG(ERROR) << "control_result_cb: unexpected status=" << toString(status)
+                 << " for session_type=" << toString(session_type_)
+                 << ", cookie=" << StringPrintf("%#hx", cookie_)
+                 << ", previous_state=" << previous_state;
+      return;
+  }
+  port_lock.unlock();
+  internal_cv_.notify_all();
+}
+
+void BluetoothAudioPortAidl::SessionChangedHandler() {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortAidl is not in use";
+    return;
+  }
+  std::unique_lock<std::mutex> port_lock(cv_mutex_);
+  BluetoothStreamState previous_state = state_;
+  LOG(INFO) << "session_changed_cb: session_type=" << toString(session_type_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_)
+            << ", previous_state=" << previous_state;
+  state_ = BluetoothStreamState::DISABLED;
+  port_lock.unlock();
+  internal_cv_.notify_all();
+}
+
+bool BluetoothAudioPortAidl::in_use() const {
+  return (
+      cookie_ !=
+      ::aidl::android::hardware::bluetooth::audio::kObserversCookieUndefined);
+}
+
+bool BluetoothAudioPortAidl::GetPreferredDataIntervalUs(
+    size_t* interval_us) const {
+  if (!in_use()) {
+    return false;
+  }
+
+  const AudioConfiguration& hal_audio_cfg =
+      BluetoothAudioSessionControl::GetAudioConfig(session_type_);
+  if (hal_audio_cfg.getTag() != AudioConfiguration::pcmConfig) {
+    return false;
+  }
+
+  const PcmConfiguration& pcm_cfg =
+      hal_audio_cfg.get<AudioConfiguration::pcmConfig>();
+  *interval_us = pcm_cfg.dataIntervalUs;
+  return true;
+}
+
+bool BluetoothAudioPortAidlOut::LoadAudioConfig(
+    audio_config_t* audio_cfg) const {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortAidlOut is not in use";
+    audio_cfg->sample_rate = kBluetoothDefaultSampleRate;
+    audio_cfg->channel_mask = kBluetoothDefaultOutputChannelModeMask;
+    audio_cfg->format = kBluetoothDefaultAudioFormatBitsPerSample;
+    return false;
+  }
+
+  const AudioConfiguration& hal_audio_cfg =
+      BluetoothAudioSessionControl::GetAudioConfig(session_type_);
+  if (hal_audio_cfg.getTag() != AudioConfiguration::pcmConfig) {
+    audio_cfg->sample_rate = kBluetoothDefaultSampleRate;
+    audio_cfg->channel_mask = kBluetoothDefaultOutputChannelModeMask;
+    audio_cfg->format = kBluetoothDefaultAudioFormatBitsPerSample;
+    return false;
+  }
+  const PcmConfiguration& pcm_cfg =
+      hal_audio_cfg.get<AudioConfiguration::pcmConfig>();
+  LOG(VERBOSE) << __func__ << ": session_type=" << toString(session_type_)
+               << ", cookie=" << StringPrintf("%#hx", cookie_)
+               << ", state=" << state_ << ", PcmConfig=[" << pcm_cfg.toString()
+               << "]";
+  if (pcm_cfg.channelMode == ChannelMode::UNKNOWN) {
+    return false;
+  }
+  audio_cfg->sample_rate = pcm_cfg.sampleRateHz;
+  audio_cfg->channel_mask =
+      (is_stereo_to_mono_
+           ? AUDIO_CHANNEL_OUT_STEREO
+           : OutputChannelModeToAudioFormat(pcm_cfg.channelMode));
+  audio_cfg->format =
+      BitsPerSampleToAudioFormat(pcm_cfg.bitsPerSample, session_type_);
+  return true;
+}
+
+bool BluetoothAudioPortAidlIn::LoadAudioConfig(
+    audio_config_t* audio_cfg) const {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortAidlIn is not in use";
+    audio_cfg->sample_rate = kBluetoothDefaultSampleRate;
+    audio_cfg->channel_mask = kBluetoothDefaultInputChannelModeMask;
+    audio_cfg->format = kBluetoothDefaultAudioFormatBitsPerSample;
+    return false;
+  }
+
+  const AudioConfiguration& hal_audio_cfg =
+      BluetoothAudioSessionControl::GetAudioConfig(session_type_);
+  if (hal_audio_cfg.getTag() != AudioConfiguration::pcmConfig) {
+    audio_cfg->sample_rate = kBluetoothDefaultSampleRate;
+    audio_cfg->channel_mask = kBluetoothDefaultInputChannelModeMask;
+    audio_cfg->format = kBluetoothDefaultAudioFormatBitsPerSample;
+    return false;
+  }
+  const PcmConfiguration& pcm_cfg =
+      hal_audio_cfg.get<AudioConfiguration::pcmConfig>();
+  LOG(VERBOSE) << __func__ << ": session_type=" << toString(session_type_)
+               << ", cookie=" << StringPrintf("%#hx", cookie_)
+               << ", state=" << state_ << ", PcmConfig=[" << pcm_cfg.toString()
+               << "]";
+  if (pcm_cfg.channelMode == ChannelMode::UNKNOWN) {
+    return false;
+  }
+
+  audio_cfg->sample_rate = pcm_cfg.sampleRateHz;
+  audio_cfg->channel_mask = InputChannelModeToAudioFormat(pcm_cfg.channelMode);
+  audio_cfg->format =
+      BitsPerSampleToAudioFormat(pcm_cfg.bitsPerSample, session_type_);
+  return true;
+}
+
+bool BluetoothAudioPortAidl::CondwaitState(BluetoothStreamState state) {
+  bool retval;
+  std::unique_lock<std::mutex> port_lock(cv_mutex_);
+  switch (state) {
+    case BluetoothStreamState::STARTING:
+      LOG(VERBOSE) << __func__ << ": session_type=" << toString(session_type_)
+                   << ", cookie=" << StringPrintf("%#hx", cookie_)
+                   << " waiting for STARTED";
+      retval = internal_cv_.wait_for(
+          port_lock, std::chrono::milliseconds(kMaxWaitingTimeMs),
+          [this] { return this->state_ != BluetoothStreamState::STARTING; });
+      retval = retval && state_ == BluetoothStreamState::STARTED;
+      break;
+    case BluetoothStreamState::SUSPENDING:
+      LOG(VERBOSE) << __func__ << ": session_type=" << toString(session_type_)
+                   << ", cookie=" << StringPrintf("%#hx", cookie_)
+                   << " waiting for SUSPENDED";
+      retval = internal_cv_.wait_for(
+          port_lock, std::chrono::milliseconds(kMaxWaitingTimeMs),
+          [this] { return this->state_ != BluetoothStreamState::SUSPENDING; });
+      retval = retval && state_ == BluetoothStreamState::STANDBY;
+      break;
+    default:
+      LOG(WARNING) << __func__ << ": session_type=" << toString(session_type_)
+                   << ", cookie=" << StringPrintf("%#hx", cookie_)
+                   << " waiting for KNOWN";
+      return false;
+  }
+
+  return retval;  // false if any failure like timeout
+}
+
+bool BluetoothAudioPortAidl::Start() {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortAidl is not in use";
+    return false;
+  }
+
+  LOG(INFO) << __func__ << ": session_type=" << toString(session_type_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_)
+            << ", state=" << state_
+            << ", mono=" << (is_stereo_to_mono_ ? "true" : "false")
+            << " request";
+  bool retval = false;
+  if (state_ == BluetoothStreamState::STANDBY) {
+    state_ = BluetoothStreamState::STARTING;
+    if (BluetoothAudioSessionControl::StartStream(session_type_)) {
+      retval = CondwaitState(BluetoothStreamState::STARTING);
+    } else {
+      LOG(ERROR) << __func__ << ": session_type=" << toString(session_type_)
+                 << ", cookie=" << StringPrintf("%#hx", cookie_)
+                 << ", state=" << state_ << " Hal fails";
+    }
+  }
+
+  if (retval) {
+    LOG(INFO) << __func__ << ": session_type=" << toString(session_type_)
+              << ", cookie=" << StringPrintf("%#hx", cookie_)
+              << ", state=" << state_
+              << ", mono=" << (is_stereo_to_mono_ ? "true" : "false")
+              << " done";
+  } else {
+    LOG(ERROR) << __func__ << ": session_type=" << toString(session_type_)
+               << ", cookie=" << StringPrintf("%#hx", cookie_)
+               << ", state=" << state_ << " failure";
+  }
+
+  return retval;  // false if any failure like timeout
+}
+
+bool BluetoothAudioPortAidl::Suspend() {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortAidl is not in use";
+    return false;
+  }
+
+  LOG(INFO) << __func__ << ": session_type=" << toString(session_type_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_)
+            << ", state=" << state_ << " request";
+  bool retval = false;
+  if (state_ == BluetoothStreamState::STARTED) {
+    state_ = BluetoothStreamState::SUSPENDING;
+    if (BluetoothAudioSessionControl::SuspendStream(session_type_)) {
+      retval = CondwaitState(BluetoothStreamState::SUSPENDING);
+    } else {
+      LOG(ERROR) << __func__ << ": session_type=" << toString(session_type_)
+                 << ", cookie=" << StringPrintf("%#hx", cookie_)
+                 << ", state=" << state_ << " Hal fails";
+    }
+  }
+
+  if (retval) {
+    LOG(INFO) << __func__ << ": session_type=" << toString(session_type_)
+              << ", cookie=" << StringPrintf("%#hx", cookie_)
+              << ", state=" << state_ << " done";
+  } else {
+    LOG(ERROR) << __func__ << ": session_type=" << toString(session_type_)
+               << ", cookie=" << StringPrintf("%#hx", cookie_)
+               << ", state=" << state_ << " failure";
+  }
+
+  return retval;  // false if any failure like timeout
+}
+
+void BluetoothAudioPortAidl::Stop() {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortAidl is not in use";
+    return;
+  }
+  LOG(INFO) << __func__ << ": session_type=" << toString(session_type_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_)
+            << ", state=" << state_ << " request";
+  state_ = BluetoothStreamState::DISABLED;
+  BluetoothAudioSessionControl::StopStream(session_type_);
+  LOG(INFO) << __func__ << ": session_type=" << toString(session_type_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_)
+            << ", state=" << state_ << " done";
+}
+
+size_t BluetoothAudioPortAidlOut::WriteData(const void* buffer,
+                                            size_t bytes) const {
+  if (!in_use()) return 0;
+  if (!is_stereo_to_mono_) {
+    return BluetoothAudioSessionControl::OutWritePcmData(session_type_, buffer,
+                                                         bytes);
+  }
+
+  // WAR to mix the stereo into Mono (16 bits per sample)
+  const size_t write_frames = bytes >> 2;
+  if (write_frames == 0) return 0;
+  auto src = static_cast<const int16_t*>(buffer);
+  std::unique_ptr<int16_t[]> dst{new int16_t[write_frames]};
+  downmix_to_mono_i16_from_stereo_i16(dst.get(), src, write_frames);
+  // a frame is 16 bits, and the size of a mono frame is equal to half a stereo.
+  return BluetoothAudioSessionControl::OutWritePcmData(session_type_, dst.get(),
+                                                       write_frames * 2) *
+         2;
+}
+
+size_t BluetoothAudioPortAidlIn::ReadData(void* buffer, size_t bytes) const {
+  if (!in_use()) return 0;
+  return BluetoothAudioSessionControl::InReadPcmData(session_type_, buffer,
+                                                     bytes);
+}
+
+bool BluetoothAudioPortAidl::GetPresentationPosition(
+    uint64_t* delay_ns, uint64_t* bytes, timespec* timestamp) const {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortAidl is not in use";
+    return false;
+  }
+  PresentationPosition presentation_position;
+  bool retval = BluetoothAudioSessionControl::GetPresentationPosition(
+      session_type_, presentation_position);
+  *delay_ns = presentation_position.remoteDeviceAudioDelayNanos;
+  *bytes = presentation_position.transmittedOctets;
+  *timestamp = {.tv_sec = static_cast<__kernel_old_time_t>(
+                    presentation_position.transmittedOctetsTimestamp.tvSec),
+                .tv_nsec = static_cast<long>(
+                    presentation_position.transmittedOctetsTimestamp.tvNSec)};
+  LOG(VERBOSE) << __func__
+               << ": session_type=" << StringPrintf("%#hhx", session_type_)
+               << ", cookie=" << StringPrintf("%#hx", cookie_)
+               << ", state=" << state_ << ", delay=" << *delay_ns
+               << "ns, data=" << *bytes
+               << " bytes, timestamp=" << timestamp->tv_sec << "."
+               << StringPrintf("%09ld", timestamp->tv_nsec) << "s";
+
+  return retval;
+}
+
+void BluetoothAudioPortAidl::UpdateSourceMetadata(
+    const source_metadata* source_metadata) const {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortAidl is not in use";
+    return;
+  }
+  LOG(DEBUG) << __func__ << ": session_type=" << toString(session_type_)
+             << ", cookie=" << StringPrintf("%#hx", cookie_)
+             << ", state=" << state_ << ", " << source_metadata->track_count
+             << " track(s)";
+  if (source_metadata->track_count == 0) return;
+  BluetoothAudioSessionControl::UpdateSourceMetadata(session_type_,
+                                                     *source_metadata);
+}
+
+void BluetoothAudioPortAidl::UpdateSinkMetadata(
+    const sink_metadata* sink_metadata) const {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortAidl is not in use";
+    return;
+  }
+  LOG(DEBUG) << __func__ << ": session_type=" << toString(session_type_)
+             << ", cookie=" << StringPrintf("%#hx", cookie_)
+             << ", state=" << state_ << ", " << sink_metadata->track_count
+             << " track(s)";
+  if (sink_metadata->track_count == 0) return;
+  BluetoothAudioSessionControl::UpdateSinkMetadata(session_type_,
+                                                   *sink_metadata);
+}
+
+BluetoothStreamState BluetoothAudioPortAidl::GetState() const { return state_; }
+
+void BluetoothAudioPortAidl::SetState(BluetoothStreamState state) {
+  state_ = state;
+}
+
+}  // namespace aidl
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/hw/device_port_proxy.h

@@ -0,0 +1,213 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <aidl/android/hardware/bluetooth/audio/BluetoothAudioStatus.h>
+#include <aidl/android/hardware/bluetooth/audio/SessionType.h>
+#include <hardware/audio.h>
+
+#include <condition_variable>
+#include <mutex>
+#include <unordered_map>
+
+enum class BluetoothStreamState : uint8_t;
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+
+/***
+ * Proxy for Bluetooth Audio HW Module to communicate with Bluetooth Audio
+ * Session Control. All methods are not thread safe, so users must acquire a
+ * lock. Note: currently, in stream_apis.cc, if GetState() is only used for
+ * verbose logging, it is not locked, so the state may not be synchronized.
+ ***/
+class BluetoothAudioPort {
+ public:
+  BluetoothAudioPort(){};
+  virtual ~BluetoothAudioPort() = default;
+
+  /***
+   * Fetch output control / data path of BluetoothAudioPort and setup
+   * callbacks into BluetoothAudioProvider. If SetUp() returns false, the audio
+   * HAL must delete this BluetoothAudioPort and return EINVAL to caller
+   ***/
+  virtual bool SetUp(audio_devices_t) { return false; }
+
+  /***
+   * Unregister this BluetoothAudioPort from BluetoothAudioSessionControl.
+   * Audio HAL must delete this BluetoothAudioPort after calling this.
+   ***/
+  virtual void TearDown() {}
+
+  /***
+   * When the Audio framework / HAL tries to query audio config about format,
+   * channel mask and sample rate, it uses this function to fetch from the
+   * Bluetooth stack
+   ***/
+  virtual bool LoadAudioConfig(audio_config_t*) const { return false; };
+
+  /***
+   * WAR to support Mono mode / 16 bits per sample
+   ***/
+  virtual void ForcePcmStereoToMono(bool) {}
+
+  /***
+   * When the Audio framework / HAL wants to change the stream state, it invokes
+   * these 3 functions to control the Bluetooth stack (Audio Control Path).
+   * Note: Both Start() and Suspend() will return true when there are no errors.
+   * Called by Audio framework / HAL to start the stream
+   ***/
+  virtual bool Start() { return false; }
+
+  /***
+   * Called by Audio framework / HAL to suspend the stream
+   ***/
+  virtual bool Suspend() { return false; };
+
+  /***
+    virtual bool Suspend() { return false; }
+    * Called by Audio framework / HAL to stop the stream
+  ***/
+  virtual void Stop() {}
+
+  /***
+   * Called by the Audio framework / HAL to fetch information about audio frames
+   * presented to an external sink, or frames presented fror an internal sink
+   ***/
+  virtual bool GetPresentationPosition(uint64_t*, uint64_t*, timespec*) const {
+    return false;
+  }
+
+  /***
+   * Called by the Audio framework / HAL when the metadata of the stream's
+   * source has been changed.
+   ***/
+  virtual void UpdateSourceMetadata(const source_metadata*) const {};
+
+  /***
+   * Return the current BluetoothStreamState
+   ***/
+  virtual BluetoothStreamState GetState() const {
+    return static_cast<BluetoothStreamState>(0);
+  }
+
+  /***
+   * Set the current BluetoothStreamState
+   ***/
+  virtual void SetState(BluetoothStreamState state) {}
+
+  virtual bool IsA2dp() const { return false; }
+
+  virtual bool GetPreferredDataIntervalUs(size_t* interval_us) const {
+    return false;
+  };
+
+  virtual size_t WriteData(const void* buffer, size_t bytes) const {
+    return 0;
+  };
+  virtual size_t ReadData(void* buffer, size_t bytes) const { return 0; };
+};
+
+namespace aidl {
+
+using ::aidl::android::hardware::bluetooth::audio::BluetoothAudioStatus;
+using ::aidl::android::hardware::bluetooth::audio::SessionType;
+
+class BluetoothAudioPortAidl : public BluetoothAudioPort {
+ public:
+  BluetoothAudioPortAidl();
+  virtual ~BluetoothAudioPortAidl() = default;
+
+  bool SetUp(audio_devices_t devices) override;
+
+  void TearDown() override;
+
+  void ForcePcmStereoToMono(bool force) override { is_stereo_to_mono_ = force; }
+
+  bool Start() override;
+  bool Suspend() override;
+  void Stop() override;
+
+  bool GetPresentationPosition(uint64_t* delay_ns, uint64_t* byte,
+                               timespec* timestamp) const override;
+
+  void UpdateSourceMetadata(
+      const source_metadata* source_metadata) const override;
+
+  /***
+   * Called by the Audio framework / HAL when the metadata of the stream's
+   * sink has been changed.
+   ***/
+  virtual void UpdateSinkMetadata(const sink_metadata* sink_metadata) const;
+
+  BluetoothStreamState GetState() const override;
+
+  void SetState(BluetoothStreamState state) override;
+
+  bool IsA2dp() const override {
+    return session_type_ == SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+           session_type_ ==
+               SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH;
+  }
+
+  bool GetPreferredDataIntervalUs(size_t* interval_us) const override;
+
+ protected:
+  uint16_t cookie_;
+  BluetoothStreamState state_;
+  SessionType session_type_;
+  // WR to support Mono: True if fetching Stereo and mixing into Mono
+  bool is_stereo_to_mono_ = false;
+  virtual bool in_use() const;
+
+ private:
+  mutable std::mutex cv_mutex_;
+  std::condition_variable internal_cv_;
+
+  // Check and initialize session type for |devices| If failed, this
+  // BluetoothAudioPortAidl is not initialized and must be deleted.
+  bool init_session_type(audio_devices_t device);
+
+  bool CondwaitState(BluetoothStreamState state);
+
+  void ControlResultHandler(const BluetoothAudioStatus& status);
+  void SessionChangedHandler();
+};
+
+class BluetoothAudioPortAidlOut : public BluetoothAudioPortAidl {
+ public:
+  ~BluetoothAudioPortAidlOut();
+
+  // The audio data path to the Bluetooth stack (Software encoding)
+  size_t WriteData(const void* buffer, size_t bytes) const override;
+  bool LoadAudioConfig(audio_config_t* audio_cfg) const override;
+};
+
+class BluetoothAudioPortAidlIn : public BluetoothAudioPortAidl {
+ public:
+  ~BluetoothAudioPortAidlIn();
+
+  // The audio data path from the Bluetooth stack (Software decoded)
+  size_t ReadData(void* buffer, size_t bytes) const override;
+  bool LoadAudioConfig(audio_config_t* audio_cfg) const override;
+};
+
+}  // namespace aidl
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/hw/device_port_proxy_hidl.cc

@@ -0,0 +1,621 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioHalDeviceProxyHIDL"
+
+#include "device_port_proxy_hidl.h"
+
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <audio_utils/primitives.h>
+#include <inttypes.h>
+#include <log/log.h>
+#include <stdlib.h>
+
+#include "BluetoothAudioSessionControl_2_1.h"
+#include "stream_apis.h"
+#include "utils.h"
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+namespace hidl {
+
+using ::android::base::StringPrintf;
+using ::android::bluetooth::audio::BluetoothAudioSessionControl_2_1;
+using ::android::hardware::bluetooth::audio::V2_0::BitsPerSample;
+using ::android::hardware::bluetooth::audio::V2_0::ChannelMode;
+using ::android::hardware::bluetooth::audio::V2_0::PcmParameters;
+using SampleRate = ::android::hardware::bluetooth::audio::V2_0::SampleRate;
+using SampleRate_2_1 = ::android::hardware::bluetooth::audio::V2_1::SampleRate;
+using BluetoothAudioStatusHidl =
+    ::android::hardware::bluetooth::audio::V2_0::Status;
+using ControlResultCallback = std::function<void(
+    uint16_t cookie, bool start_resp, const BluetoothAudioStatusHidl& status)>;
+using SessionChangedCallback = std::function<void(uint16_t cookie)>;
+
+namespace {
+
+unsigned int SampleRateToAudioFormat(SampleRate_2_1 sample_rate) {
+  switch (sample_rate) {
+    case SampleRate_2_1::RATE_8000:
+      return 8000;
+    case SampleRate_2_1::RATE_16000:
+      return 16000;
+    case SampleRate_2_1::RATE_24000:
+      return 24000;
+    case SampleRate_2_1::RATE_32000:
+      return 32000;
+    case SampleRate_2_1::RATE_44100:
+      return 44100;
+    case SampleRate_2_1::RATE_48000:
+      return 48000;
+    case SampleRate_2_1::RATE_88200:
+      return 88200;
+    case SampleRate_2_1::RATE_96000:
+      return 96000;
+    case SampleRate_2_1::RATE_176400:
+      return 176400;
+    case SampleRate_2_1::RATE_192000:
+      return 192000;
+    default:
+      return kBluetoothDefaultSampleRate;
+  }
+}
+audio_channel_mask_t OutputChannelModeToAudioFormat(ChannelMode channel_mode) {
+  switch (channel_mode) {
+    case ChannelMode::MONO:
+      return AUDIO_CHANNEL_OUT_MONO;
+    case ChannelMode::STEREO:
+      return AUDIO_CHANNEL_OUT_STEREO;
+    default:
+      return kBluetoothDefaultOutputChannelModeMask;
+  }
+}
+
+audio_channel_mask_t InputChannelModeToAudioFormat(ChannelMode channel_mode) {
+  switch (channel_mode) {
+    case ChannelMode::MONO:
+      return AUDIO_CHANNEL_IN_MONO;
+    case ChannelMode::STEREO:
+      return AUDIO_CHANNEL_IN_STEREO;
+    default:
+      return kBluetoothDefaultInputChannelModeMask;
+  }
+}
+
+audio_format_t BitsPerSampleToAudioFormat(BitsPerSample bits_per_sample) {
+  switch (bits_per_sample) {
+    case BitsPerSample::BITS_16:
+      return AUDIO_FORMAT_PCM_16_BIT;
+    case BitsPerSample::BITS_24:
+      return AUDIO_FORMAT_PCM_24_BIT_PACKED;
+    case BitsPerSample::BITS_32:
+      return AUDIO_FORMAT_PCM_32_BIT;
+    default:
+      return kBluetoothDefaultAudioFormatBitsPerSample;
+  }
+}
+
+// The maximum time to wait in std::condition_variable::wait_for()
+constexpr unsigned int kMaxWaitingTimeMs = 4500;
+
+}  // namespace
+
+BluetoothAudioPortHidl::BluetoothAudioPortHidl()
+    : session_type_hidl_(SessionType_2_1::UNKNOWN),
+      cookie_(android::bluetooth::audio::kObserversCookieUndefined),
+      state_(BluetoothStreamState::DISABLED) {}
+
+BluetoothAudioPortHidlOut::~BluetoothAudioPortHidlOut() {
+  if (BluetoothAudioPortHidl::in_use()) BluetoothAudioPortHidl::TearDown();
+}
+
+BluetoothAudioPortHidlIn::~BluetoothAudioPortHidlIn() {
+  if (BluetoothAudioPortHidl::in_use()) BluetoothAudioPortHidl::TearDown();
+}
+
+bool BluetoothAudioPortHidl::SetUp(audio_devices_t devices) {
+  if (!init_session_type(devices)) return false;
+
+  state_ = BluetoothStreamState::STANDBY;
+
+  auto control_result_cb = [port = this](
+                               uint16_t cookie, bool start_resp,
+                               const BluetoothAudioStatusHidl& status) {
+    if (!port->in_use()) {
+      LOG(ERROR) << "control_result_cb: BluetoothAudioPort is not in use";
+      return;
+    }
+    if (port->cookie_ != cookie) {
+      LOG(ERROR) << "control_result_cb: proxy of device port (cookie="
+                 << StringPrintf("%#hx", cookie) << ") is corrupted";
+      return;
+    }
+    port->ControlResultHandler(status);
+  };
+  auto session_changed_cb = [port = this](uint16_t cookie) {
+    if (!port->in_use()) {
+      LOG(ERROR) << "session_changed_cb: BluetoothAudioPort is not in use";
+      return;
+    }
+    if (port->cookie_ != cookie) {
+      LOG(ERROR) << "session_changed_cb: proxy of device port (cookie="
+                 << StringPrintf("%#hx", cookie) << ") is corrupted";
+      return;
+    }
+    port->SessionChangedHandler();
+  };
+  ::android::bluetooth::audio::PortStatusCallbacks cbacks = {
+      .control_result_cb_ = control_result_cb,
+      .session_changed_cb_ = session_changed_cb};
+  cookie_ = BluetoothAudioSessionControl_2_1::RegisterControlResultCback(
+      session_type_hidl_, cbacks);
+  LOG(INFO) << __func__ << ": session_type=" << toString(session_type_hidl_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_);
+
+  return (cookie_ != android::bluetooth::audio::kObserversCookieUndefined);
+}
+
+bool BluetoothAudioPortHidl::init_session_type(audio_devices_t device) {
+  switch (device) {
+    case AUDIO_DEVICE_OUT_BLUETOOTH_A2DP:
+    case AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES:
+    case AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER:
+      LOG(VERBOSE)
+          << __func__
+          << ": device=AUDIO_DEVICE_OUT_BLUETOOTH_A2DP (HEADPHONES/SPEAKER) ("
+          << StringPrintf("%#x", device) << ")";
+      session_type_hidl_ = SessionType_2_1::A2DP_SOFTWARE_ENCODING_DATAPATH;
+      break;
+    case AUDIO_DEVICE_OUT_HEARING_AID:
+      LOG(VERBOSE) << __func__
+                   << ": device=AUDIO_DEVICE_OUT_HEARING_AID (MEDIA/VOICE) ("
+                   << StringPrintf("%#x", device) << ")";
+      session_type_hidl_ =
+          SessionType_2_1::HEARING_AID_SOFTWARE_ENCODING_DATAPATH;
+      break;
+    case AUDIO_DEVICE_OUT_BLE_HEADSET:
+      LOG(VERBOSE) << __func__
+                   << ": device=AUDIO_DEVICE_OUT_BLE_HEADSET (MEDIA/VOICE) ("
+                   << StringPrintf("%#x", device) << ")";
+      session_type_hidl_ = SessionType_2_1::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH;
+      break;
+    case AUDIO_DEVICE_OUT_BLE_SPEAKER:
+      LOG(VERBOSE) << __func__
+                   << ": device=AUDIO_DEVICE_OUT_BLE_SPEAKER (MEDIA) ("
+                   << StringPrintf("%#x", device) << ")";
+      session_type_hidl_ = SessionType_2_1::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH;
+      break;
+    case AUDIO_DEVICE_IN_BLE_HEADSET:
+      LOG(VERBOSE) << __func__
+                   << ": device=AUDIO_DEVICE_IN_BLE_HEADSET (VOICE) ("
+                   << StringPrintf("%#x", device) << ")";
+      session_type_hidl_ = SessionType_2_1::LE_AUDIO_SOFTWARE_DECODED_DATAPATH;
+      break;
+    default:
+      LOG(ERROR) << __func__
+                 << ": unknown device=" << StringPrintf("%#x", device);
+      return false;
+  }
+
+  if (!BluetoothAudioSessionControl_2_1::IsSessionReady(session_type_hidl_)) {
+    LOG(ERROR) << __func__ << ": device=" << StringPrintf("%#x", device)
+               << ", session_type=" << toString(session_type_hidl_)
+               << " is not ready";
+    return false;
+  }
+  return true;
+}
+
+void BluetoothAudioPortHidl::TearDown() {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": session_type=" << toString(session_type_hidl_)
+               << ", cookie=" << StringPrintf("%#hx", cookie_)
+               << " unknown monitor";
+    return;
+  }
+
+  LOG(INFO) << __func__ << ": session_type=" << toString(session_type_hidl_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_);
+  BluetoothAudioSessionControl_2_1::UnregisterControlResultCback(
+      session_type_hidl_, cookie_);
+  cookie_ = android::bluetooth::audio::kObserversCookieUndefined;
+}
+
+void BluetoothAudioPortHidl::ControlResultHandler(
+    const BluetoothAudioStatusHidl& status) {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortis not in use";
+    return;
+  }
+  std::unique_lock<std::mutex> port_lock(cv_mutex_);
+  BluetoothStreamState previous_state = state_;
+  LOG(INFO) << "control_result_cb: session_type="
+            << toString(session_type_hidl_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_)
+            << ", previous_state=" << previous_state
+            << ", status=" << toString(status);
+
+  switch (previous_state) {
+    case BluetoothStreamState::STARTED:
+      /* Only Suspend signal can be send in STARTED state*/
+      if (status == BluetoothAudioStatus::SUCCESS) {
+        state_ = BluetoothStreamState::STANDBY;
+      } else {
+        // Set to standby since the stack may be busy switching between outputs
+        LOG(WARNING) << "control_result_cb: status=" << toString(status)
+                     << " failure for session_type="
+                     << toString(session_type_hidl_)
+                     << ", cookie=" << StringPrintf("%#hx", cookie_)
+                     << ", previous_state=" << previous_state;
+      }
+      break;
+    case BluetoothStreamState::STARTING:
+      if (status == BluetoothAudioStatusHidl::SUCCESS) {
+        state_ = BluetoothStreamState::STARTED;
+      } else {
+        // Set to standby since the stack may be busy switching between outputs
+        LOG(WARNING) << "control_result_cb: status=" << toString(status)
+                     << " failure for session_type="
+                     << toString(session_type_hidl_)
+                     << ", cookie=" << StringPrintf("%#hx", cookie_)
+                     << ", previous_state=" << previous_state;
+        state_ = BluetoothStreamState::STANDBY;
+      }
+      break;
+    case BluetoothStreamState::SUSPENDING:
+      if (status == BluetoothAudioStatusHidl::SUCCESS) {
+        state_ = BluetoothStreamState::STANDBY;
+      } else {
+        // It will be failed if the headset is disconnecting, and set to disable
+        // to wait for re-init again
+        LOG(WARNING) << "control_result_cb: status=" << toString(status)
+                     << " failure for session_type="
+                     << toString(session_type_hidl_)
+                     << ", cookie=" << StringPrintf("%#hx", cookie_)
+                     << ", previous_state=" << previous_state;
+        state_ = BluetoothStreamState::DISABLED;
+      }
+      break;
+    default:
+      LOG(ERROR) << "control_result_cb: unexpected status=" << toString(status)
+                 << " for session_type=" << toString(session_type_hidl_)
+                 << ", cookie=" << StringPrintf("%#hx", cookie_)
+                 << ", previous_state=" << previous_state;
+      return;
+  }
+  port_lock.unlock();
+  internal_cv_.notify_all();
+}
+
+void BluetoothAudioPortHidl::SessionChangedHandler() {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPort is not in use";
+    return;
+  }
+  std::unique_lock<std::mutex> port_lock(cv_mutex_);
+  BluetoothStreamState previous_state = state_;
+  LOG(INFO) << "session_changed_cb: session_type="
+            << toString(session_type_hidl_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_)
+            << ", previous_state=" << previous_state;
+  state_ = BluetoothStreamState::DISABLED;
+  port_lock.unlock();
+  internal_cv_.notify_all();
+}
+
+bool BluetoothAudioPortHidl::in_use() const {
+  return (cookie_ != android::bluetooth::audio::kObserversCookieUndefined);
+}
+
+bool BluetoothAudioPortHidl::GetPreferredDataIntervalUs(
+    size_t* interval_us) const {
+  if (!in_use()) {
+    return false;
+  }
+
+  const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration&
+      hal_audio_cfg =
+          BluetoothAudioSessionControl_2_1::GetAudioConfig(session_type_hidl_);
+  if (hal_audio_cfg.getDiscriminator() !=
+      ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration::
+          hidl_discriminator::pcmConfig) {
+    return false;
+  }
+
+  const ::android::hardware::bluetooth::audio::V2_1::PcmParameters& pcm_cfg =
+      hal_audio_cfg.pcmConfig();
+  *interval_us = pcm_cfg.dataIntervalUs;
+  return true;
+}
+
+bool BluetoothAudioPortHidl::CondwaitState(BluetoothStreamState state) {
+  bool retval;
+  std::unique_lock<std::mutex> port_lock(cv_mutex_);
+  switch (state) {
+    case BluetoothStreamState::STARTING:
+      LOG(VERBOSE) << __func__
+                   << ": session_type=" << toString(session_type_hidl_)
+                   << ", cookie=" << StringPrintf("%#hx", cookie_)
+                   << " waiting for STARTED";
+      retval = internal_cv_.wait_for(
+          port_lock, std::chrono::milliseconds(kMaxWaitingTimeMs),
+          [this] { return this->state_ != BluetoothStreamState::STARTING; });
+      retval = retval && state_ == BluetoothStreamState::STARTED;
+      break;
+    case BluetoothStreamState::SUSPENDING:
+      LOG(VERBOSE) << __func__
+                   << ": session_type=" << toString(session_type_hidl_)
+                   << ", cookie=" << StringPrintf("%#hx", cookie_)
+                   << " waiting for SUSPENDED";
+      retval = internal_cv_.wait_for(
+          port_lock, std::chrono::milliseconds(kMaxWaitingTimeMs),
+          [this] { return this->state_ != BluetoothStreamState::SUSPENDING; });
+      retval = retval && state_ == BluetoothStreamState::STANDBY;
+      break;
+    default:
+      LOG(WARNING) << __func__
+                   << ": session_type=" << toString(session_type_hidl_)
+                   << ", cookie=" << StringPrintf("%#hx", cookie_)
+                   << " waiting for KNOWN";
+      return false;
+  }
+
+  return retval;  // false if any failure like timeout
+}
+
+bool BluetoothAudioPortHidl::Start() {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPort is not in use";
+    return false;
+  }
+
+  LOG(INFO) << __func__ << ": session_type=" << toString(session_type_hidl_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_)
+            << ", state=" << state_
+            << ", mono=" << (is_stereo_to_mono_ ? "true" : "false")
+            << " request";
+  bool retval = false;
+  if (state_ == BluetoothStreamState::STANDBY) {
+    state_ = BluetoothStreamState::STARTING;
+    if (BluetoothAudioSessionControl_2_1::StartStream(session_type_hidl_)) {
+      retval = CondwaitState(BluetoothStreamState::STARTING);
+    } else {
+      LOG(ERROR) << __func__
+                 << ": session_type=" << toString(session_type_hidl_)
+                 << ", cookie=" << StringPrintf("%#hx", cookie_)
+                 << ", state=" << state_ << " Hal fails";
+    }
+  }
+
+  if (retval) {
+    LOG(INFO) << __func__ << ": session_type=" << toString(session_type_hidl_)
+              << ", cookie=" << StringPrintf("%#hx", cookie_)
+              << ", state=" << state_
+              << ", mono=" << (is_stereo_to_mono_ ? "true" : "false")
+              << " done";
+  } else {
+    LOG(ERROR) << __func__ << ": session_type=" << toString(session_type_hidl_)
+               << ", cookie=" << StringPrintf("%#hx", cookie_)
+               << ", state=" << state_ << " failure";
+  }
+
+  return retval;  // false if any failure like timeout
+}
+
+bool BluetoothAudioPortHidl::Suspend() {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPort is not in use";
+    return false;
+  }
+
+  LOG(INFO) << __func__ << ": session_type=" << toString(session_type_hidl_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_)
+            << ", state=" << state_ << " request";
+  bool retval = false;
+  if (state_ == BluetoothStreamState::STARTED) {
+    state_ = BluetoothStreamState::SUSPENDING;
+    if (BluetoothAudioSessionControl_2_1::SuspendStream(session_type_hidl_)) {
+      retval = CondwaitState(BluetoothStreamState::SUSPENDING);
+    } else {
+      LOG(ERROR) << __func__
+                 << ": session_type=" << toString(session_type_hidl_)
+                 << ", cookie=" << StringPrintf("%#hx", cookie_)
+                 << ", state=" << state_ << " Hal fails";
+    }
+  }
+
+  if (retval) {
+    LOG(INFO) << __func__ << ": session_type=" << toString(session_type_hidl_)
+              << ", cookie=" << StringPrintf("%#hx", cookie_)
+              << ", state=" << state_ << " done";
+  } else {
+    LOG(ERROR) << __func__ << ": session_type=" << toString(session_type_hidl_)
+               << ", cookie=" << StringPrintf("%#hx", cookie_)
+               << ", state=" << state_ << " failure";
+  }
+
+  return retval;  // false if any failure like timeout
+}
+
+void BluetoothAudioPortHidl::Stop() {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPort is not in use";
+    return;
+  }
+  LOG(INFO) << __func__ << ": session_type=" << toString(session_type_hidl_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_)
+            << ", state=" << state_ << " request";
+  state_ = BluetoothStreamState::DISABLED;
+  BluetoothAudioSessionControl_2_1::StopStream(session_type_hidl_);
+  LOG(INFO) << __func__ << ": session_type=" << toString(session_type_hidl_)
+            << ", cookie=" << StringPrintf("%#hx", cookie_)
+            << ", state=" << state_ << " done";
+}
+
+bool BluetoothAudioPortHidl::GetPresentationPosition(
+    uint64_t* delay_ns, uint64_t* bytes, timespec* timestamp) const {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPort is not in use";
+    return false;
+  }
+  bool retval = BluetoothAudioSessionControl_2_1::GetPresentationPosition(
+      session_type_hidl_, delay_ns, bytes, timestamp);
+  LOG(VERBOSE) << __func__
+               << ": session_type=" << StringPrintf("%#hhx", session_type_hidl_)
+               << ", cookie=" << StringPrintf("%#hx", cookie_)
+               << ", state=" << state_ << ", delay=" << *delay_ns
+               << "ns, data=" << *bytes
+               << " bytes, timestamp=" << timestamp->tv_sec << "."
+               << StringPrintf("%09ld", timestamp->tv_nsec) << "s";
+
+  return retval;
+}
+
+void BluetoothAudioPortHidl::UpdateSourceMetadata(
+    const source_metadata* source_metadata) const {
+  if (!in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPort is not in use";
+    return;
+  }
+  LOG(DEBUG) << __func__ << ": session_type=" << toString(session_type_hidl_)
+             << ", cookie=" << StringPrintf("%#hx", cookie_)
+             << ", state=" << state_ << ", " << source_metadata->track_count
+             << " track(s)";
+  if (source_metadata->track_count == 0) return;
+  BluetoothAudioSessionControl_2_1::UpdateTracksMetadata(session_type_hidl_,
+                                                         source_metadata);
+}
+
+BluetoothStreamState BluetoothAudioPortHidl::GetState() const { return state_; }
+
+void BluetoothAudioPortHidl::SetState(BluetoothStreamState state) {
+  state_ = state;
+}
+
+size_t BluetoothAudioPortHidlOut::WriteData(const void* buffer,
+                                            size_t bytes) const {
+  if (!BluetoothAudioPortHidl::in_use()) return 0;
+  if (!BluetoothAudioPortHidl::is_stereo_to_mono_) {
+    return BluetoothAudioSessionControl_2_1::OutWritePcmData(session_type_hidl_,
+                                                             buffer, bytes);
+  }
+
+  // WAR to mix the stereo into Mono (16 bits per sample)
+  const size_t write_frames = bytes >> 2;
+  if (write_frames == 0) return 0;
+  auto src = static_cast<const int16_t*>(buffer);
+  std::unique_ptr<int16_t[]> dst{new int16_t[write_frames]};
+  downmix_to_mono_i16_from_stereo_i16(dst.get(), src, write_frames);
+  // a frame is 16 bits, and the size of a mono frame is equal to half a stereo.
+  return BluetoothAudioSessionControl_2_1::OutWritePcmData(
+             session_type_hidl_, dst.get(), write_frames * 2) *
+         2;
+}
+
+size_t BluetoothAudioPortHidlIn::ReadData(void* buffer, size_t bytes) const {
+  if (!BluetoothAudioPortHidl::in_use()) return 0;
+  return BluetoothAudioSessionControl_2_1::InReadPcmData(session_type_hidl_,
+                                                         buffer, bytes);
+}
+
+bool BluetoothAudioPortHidlIn::LoadAudioConfig(
+    audio_config_t* audio_cfg) const {
+  if (!BluetoothAudioPortHidl::in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortIn is not in use";
+    audio_cfg->sample_rate = kBluetoothDefaultSampleRate;
+    audio_cfg->channel_mask = kBluetoothDefaultInputChannelModeMask;
+    audio_cfg->format = kBluetoothDefaultAudioFormatBitsPerSample;
+    return false;
+  }
+
+  const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration&
+      hal_audio_cfg =
+          BluetoothAudioSessionControl_2_1::GetAudioConfig(session_type_hidl_);
+  if (hal_audio_cfg.getDiscriminator() !=
+      ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration::
+          hidl_discriminator::pcmConfig) {
+    audio_cfg->sample_rate = kBluetoothDefaultSampleRate;
+    audio_cfg->channel_mask = kBluetoothDefaultInputChannelModeMask;
+    audio_cfg->format = kBluetoothDefaultAudioFormatBitsPerSample;
+    return false;
+  }
+  const ::android::hardware::bluetooth::audio::V2_1::PcmParameters& pcm_cfg =
+      hal_audio_cfg.pcmConfig();
+  LOG(VERBOSE) << __func__ << ": session_type=" << toString(session_type_hidl_)
+               << ", cookie="
+               << StringPrintf("%#hx", BluetoothAudioPortHidl::cookie_)
+               << ", state=" << BluetoothAudioPortHidl::state_
+               << ", PcmConfig=[" << toString(pcm_cfg) << "]";
+  if (pcm_cfg.sampleRate == SampleRate_2_1::RATE_UNKNOWN ||
+      pcm_cfg.channelMode == ChannelMode::UNKNOWN ||
+      pcm_cfg.bitsPerSample == BitsPerSample::BITS_UNKNOWN) {
+    return false;
+  }
+
+  audio_cfg->sample_rate = SampleRateToAudioFormat(pcm_cfg.sampleRate);
+  audio_cfg->channel_mask = InputChannelModeToAudioFormat(pcm_cfg.channelMode);
+  audio_cfg->format = BitsPerSampleToAudioFormat(pcm_cfg.bitsPerSample);
+  return true;
+}
+
+bool BluetoothAudioPortHidlOut::LoadAudioConfig(
+    audio_config_t* audio_cfg) const {
+  if (!BluetoothAudioPortHidl::in_use()) {
+    LOG(ERROR) << __func__ << ": BluetoothAudioPortOut is not in use";
+    audio_cfg->sample_rate = kBluetoothDefaultSampleRate;
+    audio_cfg->channel_mask = kBluetoothDefaultOutputChannelModeMask;
+    audio_cfg->format = kBluetoothDefaultAudioFormatBitsPerSample;
+    return false;
+  }
+
+  const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration&
+      hal_audio_cfg =
+          BluetoothAudioSessionControl_2_1::GetAudioConfig(session_type_hidl_);
+  if (hal_audio_cfg.getDiscriminator() !=
+      ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration::
+          hidl_discriminator::pcmConfig) {
+    audio_cfg->sample_rate = kBluetoothDefaultSampleRate;
+    audio_cfg->channel_mask = kBluetoothDefaultOutputChannelModeMask;
+    audio_cfg->format = kBluetoothDefaultAudioFormatBitsPerSample;
+    return false;
+  }
+  const ::android::hardware::bluetooth::audio::V2_1::PcmParameters& pcm_cfg =
+      hal_audio_cfg.pcmConfig();
+  LOG(VERBOSE) << __func__ << ": session_type=" << toString(session_type_hidl_)
+               << ", cookie="
+               << StringPrintf("%#hx", BluetoothAudioPortHidl::cookie_)
+               << ", state=" << BluetoothAudioPortHidl::state_
+               << ", PcmConfig=[" << toString(pcm_cfg) << "]";
+  if (pcm_cfg.sampleRate == SampleRate_2_1::RATE_UNKNOWN ||
+      pcm_cfg.channelMode == ChannelMode::UNKNOWN ||
+      pcm_cfg.bitsPerSample == BitsPerSample::BITS_UNKNOWN) {
+    return false;
+  }
+  audio_cfg->sample_rate = SampleRateToAudioFormat(pcm_cfg.sampleRate);
+  audio_cfg->channel_mask =
+      (BluetoothAudioPortHidl::is_stereo_to_mono_
+           ? AUDIO_CHANNEL_OUT_STEREO
+           : OutputChannelModeToAudioFormat(pcm_cfg.channelMode));
+  audio_cfg->format = BitsPerSampleToAudioFormat(pcm_cfg.bitsPerSample);
+  return true;
+}
+
+}  // namespace hidl
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/hw/device_port_proxy_hidl.h

@@ -0,0 +1,116 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <android/hardware/bluetooth/audio/2.1/types.h>
+#include <hardware/audio.h>
+
+#include <condition_variable>
+#include <mutex>
+#include <unordered_map>
+
+#include "device_port_proxy.h"
+
+enum class BluetoothStreamState : uint8_t;
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+namespace hidl {
+
+using SessionType_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::SessionType;
+
+class BluetoothAudioPortHidl : public BluetoothAudioPort {
+ public:
+  BluetoothAudioPortHidl();
+  virtual ~BluetoothAudioPortHidl() = default;
+
+  bool SetUp(audio_devices_t devices) override;
+
+  void TearDown() override;
+
+  void ForcePcmStereoToMono(bool force) override { is_stereo_to_mono_ = force; }
+
+  bool Start() override;
+
+  bool Suspend() override;
+
+  void Stop() override;
+
+  bool GetPresentationPosition(uint64_t* delay_ns, uint64_t* bytes,
+                               timespec* timestamp) const override;
+
+  void UpdateSourceMetadata(
+      const source_metadata* source_metadata) const override;
+
+  BluetoothStreamState GetState() const override;
+
+  void SetState(BluetoothStreamState state) override;
+
+  bool IsA2dp() const override {
+    return session_type_hidl_ ==
+               SessionType_2_1::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+           session_type_hidl_ ==
+               SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH;
+  }
+
+  bool GetPreferredDataIntervalUs(size_t* interval_us) const override;
+
+ protected:
+  SessionType_2_1 session_type_hidl_;
+  uint16_t cookie_;
+  BluetoothStreamState state_;
+  // WR to support Mono: True if fetching Stereo and mixing into Mono
+  bool is_stereo_to_mono_ = false;
+
+  bool in_use() const;
+
+ private:
+  mutable std::mutex cv_mutex_;
+  std::condition_variable internal_cv_;
+
+  bool init_session_type(audio_devices_t device);
+
+  bool CondwaitState(BluetoothStreamState state);
+
+  void ControlResultHandler(
+      const ::android::hardware::bluetooth::audio::V2_0::Status& status);
+
+  void SessionChangedHandler();
+};
+
+class BluetoothAudioPortHidlOut : public BluetoothAudioPortHidl {
+ public:
+  ~BluetoothAudioPortHidlOut();
+
+  size_t WriteData(const void* buffer, size_t bytes) const override;
+  bool LoadAudioConfig(audio_config_t* audio_cfg) const override;
+};
+
+class BluetoothAudioPortHidlIn : public BluetoothAudioPortHidl {
+ public:
+  ~BluetoothAudioPortHidlIn();
+
+  size_t ReadData(void* buffer, size_t bytes) const override;
+  bool LoadAudioConfig(audio_config_t* audio_cfg) const override;
+};
+
+}  // namespace hidl
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/hw/stream_apis.h

@@ -0,0 +1,129 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <hardware/audio.h>
+#include <system/audio.h>
+
+#include <list>
+
+#include "device_port_proxy.h"
+#include "device_port_proxy_hidl.h"
+
+constexpr unsigned int kBluetoothDefaultSampleRate = 44100;
+constexpr audio_format_t kBluetoothDefaultAudioFormatBitsPerSample =
+    AUDIO_FORMAT_PCM_16_BIT;
+
+constexpr unsigned int kBluetoothDefaultInputBufferMs = 20;
+constexpr unsigned int kBluetoothDefaultInputStateTimeoutMs = 20;
+
+constexpr unsigned int kBluetoothDefaultOutputBufferMs = 10;
+constexpr unsigned int kBluetoothSpatializerOutputBufferMs = 10;
+
+constexpr audio_channel_mask_t kBluetoothDefaultOutputChannelModeMask =
+    AUDIO_CHANNEL_OUT_STEREO;
+constexpr audio_channel_mask_t kBluetoothDefaultInputChannelModeMask =
+    AUDIO_CHANNEL_IN_MONO;
+
+enum class BluetoothStreamState : uint8_t {
+  DISABLED = 0,  // This stream is closing or set param "suspend=true"
+  STANDBY,
+  STARTING,
+  STARTED,
+  SUSPENDING,
+  UNKNOWN,
+};
+
+std::ostream& operator<<(std::ostream& os, const BluetoothStreamState& state);
+
+struct BluetoothStreamOut {
+  // Must be the first member so it can be cast from audio_stream
+  // or audio_stream_out pointer
+  audio_stream_out stream_out_{};
+  std::unique_ptr<::android::bluetooth::audio::BluetoothAudioPort>
+      bluetooth_output_;
+  bool is_aidl;
+  int64_t last_write_time_us_;
+  // Audio PCM Configs
+  uint32_t sample_rate_;
+  audio_channel_mask_t channel_mask_;
+  audio_format_t format_;
+  size_t preferred_data_interval_us;
+  // frame is the number of samples per channel
+  // frames count per tick
+  size_t frames_count_;
+  // total frames written, reset on standby
+  uint64_t frames_rendered_;
+  // total frames written after opened, never reset
+  uint64_t frames_presented_;
+  mutable std::mutex mutex_;
+};
+
+struct BluetoothAudioDevice {
+  // Important: device must be first as an audio_hw_device* may be cast to
+  // BluetoothAudioDevice* when the type is implicitly known.
+  audio_hw_device audio_device_{};
+  // protect against device->output and stream_out from being inconsistent
+  std::mutex mutex_;
+  std::list<BluetoothStreamOut*> opened_stream_outs_ =
+      std::list<BluetoothStreamOut*>(0);
+};
+
+struct BluetoothStreamIn {
+  // Must be the first member so it can be cast from audio_stream
+  // or audio_stream_in pointer
+  audio_stream_in stream_in_;
+  std::unique_ptr<::android::bluetooth::audio::BluetoothAudioPort>
+      bluetooth_input_;
+  bool is_aidl;
+  int64_t last_read_time_us_;
+  // Audio PCM Configs
+  uint32_t sample_rate_;
+  audio_channel_mask_t channel_mask_;
+  audio_format_t format_;
+  size_t preferred_data_interval_us;
+  // frame is the number of samples per channel
+  // frames count per tick
+  size_t frames_count_;
+  // total frames read after opened, never reset
+  uint64_t frames_presented_;
+  mutable std::mutex mutex_;
+};
+
+int adev_open_output_stream(struct audio_hw_device* dev,
+                            audio_io_handle_t handle, audio_devices_t devices,
+                            audio_output_flags_t flags,
+                            struct audio_config* config,
+                            struct audio_stream_out** stream_out,
+                            const char* address __unused);
+
+void adev_close_output_stream(struct audio_hw_device* dev,
+                              struct audio_stream_out* stream);
+
+size_t adev_get_input_buffer_size(const struct audio_hw_device* dev,
+                                  const struct audio_config* config);
+
+int adev_open_input_stream(struct audio_hw_device* dev,
+                           audio_io_handle_t handle, audio_devices_t devices,
+                           struct audio_config* config,
+                           struct audio_stream_in** stream_in,
+                           audio_input_flags_t flags __unused,
+                           const char* address __unused,
+                           audio_source_t source __unused);
+
+void adev_close_input_stream(struct audio_hw_device* dev,
+                             struct audio_stream_in* in);

bluetooth/audio/hw/utils.cc

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioHalUtils"
+
+#include "utils.h"
+
+#include <android-base/logging.h>
+#include <android-base/strings.h>
+#include <log/log.h>
+#include <stdlib.h>
+#include <sstream>
+#include <vector>
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+namespace utils {
+
+std::unordered_map<std::string, std::string> ParseAudioParams(
+    const std::string& params) {
+  std::vector<std::string> segments = android::base::Split(params, ";");
+  std::unordered_map<std::string, std::string> params_map;
+  for (const auto& segment : segments) {
+    if (segment.length() == 0) {
+      continue;
+    }
+    std::vector<std::string> kv = android::base::Split(segment, "=");
+    if (kv[0].empty()) {
+      LOG(WARNING) << __func__ << ": Invalid audio parameter " << segment;
+      continue;
+    }
+    params_map[kv[0]] = (kv.size() > 1 ? kv[1] : "");
+  }
+  return params_map;
+}
+
+std::string GetAudioParamString(
+    std::unordered_map<std::string, std::string>& params_map) {
+  std::ostringstream sout;
+  for (const auto& ptr : params_map) {
+    sout << "key: '" << ptr.first << "' value: '" << ptr.second << "'\n";
+  }
+  return sout.str();
+}
+
+}  // namespace utils
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/hw/utils.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <string>
+#include <unordered_map>
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+namespace utils {
+
+// Creates a hash map based on the |params| string containing key and value
+// pairs.  Pairs are expected in the form "key=value" separated by the ';'
+// character.  Both ';' and '=' characters are invalid in keys or values.
+// Examples:
+//   "key0"                      -> map: [key0]=""
+//   "key0=value0;key1=value1;"  -> map: [key0]="value0" [key1]="value1"
+//   "key0=;key1=value1;"        -> map: [key0]="" [key1]="value1"
+//   "=value0;key1=value1;"      -> map: [key1]="value1"
+std::unordered_map<std::string, std::string> ParseAudioParams(
+    const std::string& params);
+
+// Dumps the contents of the hash_map to the log for debugging purposes.
+// If |map| is not NULL, all entries of |map| will be dumped, otherwise
+// nothing will be dumped. Note that this function does not take the ownership
+// of the |map|.
+std::string GetAudioParamString(
+    std::unordered_map<std::string, std::string>& params_map);
+
+}  // namespace utils
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/utils/Android.bp

@@ -0,0 +1,46 @@
+cc_library_shared {
+    name: "libbluetooth_audio_session_system",
+    defaults: ["hidl_defaults"],
+    srcs: [
+        "session/BluetoothAudioSession.cpp",
+        "session/BluetoothAudioSession_2_1.cpp",
+        "session/BluetoothAudioSupportedCodecsDB.cpp",
+        "session/BluetoothAudioSupportedCodecsDB_2_1.cpp",
+    ],
+    export_include_dirs: ["session/"],
+    header_libs: ["libhardware_headers"],
+    shared_libs: [
+        "android.hardware.audio.common@5.0",
+        "android.hardware.bluetooth.audio@2.0",
+        "android.hardware.bluetooth.audio@2.1",
+        "libbase",
+        "libcutils",
+        "libfmq",
+        "libhidlbase",
+        "liblog",
+        "libutils",
+        "libbluetooth_audio_session_aidl_system",
+    ],
+}
+
+cc_library_shared {
+    name: "libbluetooth_audio_session_aidl_system",
+    srcs: [
+        "aidl_session/BluetoothAudioCodecs.cpp",
+        "aidl_session/BluetoothAudioSession.cpp",
+        "aidl_session/HidlToAidlMiddleware.cpp",
+    ],
+    export_include_dirs: ["aidl_session/"],
+    header_libs: ["libhardware_headers"],
+    shared_libs: [
+        "android.hardware.bluetooth.audio@2.0",
+        "android.hardware.bluetooth.audio@2.1",
+        "libbase",
+        "libcutils",
+        "libbinder_ndk",
+        "libfmq",
+        "liblog",
+        "android.hardware.bluetooth.audio-V2-ndk",
+        "libhidlbase",
+    ],
+}

bluetooth/audio/utils/aidl_session/BluetoothAudioCodecs.cpp

@@ -0,0 +1,523 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioCodecsAidl"
+
+#include "BluetoothAudioCodecs.h"
+
+#include <aidl/android/hardware/bluetooth/audio/AacCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/AacObjectType.h>
+#include <aidl/android/hardware/bluetooth/audio/AptxCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/ChannelMode.h>
+#include <aidl/android/hardware/bluetooth/audio/LdacCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/LdacChannelMode.h>
+#include <aidl/android/hardware/bluetooth/audio/LdacQualityIndex.h>
+#include <aidl/android/hardware/bluetooth/audio/LeAudioConfiguration.h>
+#include <aidl/android/hardware/bluetooth/audio/OpusCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/OpusConfiguration.h>
+#include <aidl/android/hardware/bluetooth/audio/SbcCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/SbcChannelMode.h>
+#include <android-base/logging.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+static const PcmCapabilities kDefaultSoftwarePcmCapabilities = {
+    .sampleRateHz = {16000, 24000, 32000, 44100, 48000, 88200, 96000},
+    .channelMode = {ChannelMode::MONO, ChannelMode::STEREO},
+    .bitsPerSample = {16, 24, 32},
+    .dataIntervalUs = {},
+};
+
+static const SbcCapabilities kDefaultOffloadSbcCapability = {
+    .sampleRateHz = {44100},
+    .channelMode = {SbcChannelMode::MONO, SbcChannelMode::JOINT_STEREO},
+    .blockLength = {4, 8, 12, 16},
+    .numSubbands = {8},
+    .allocMethod = {SbcAllocMethod::ALLOC_MD_L},
+    .bitsPerSample = {16},
+    .minBitpool = 2,
+    .maxBitpool = 53};
+
+static const AacCapabilities kDefaultOffloadAacCapability = {
+    .objectType = {AacObjectType::MPEG2_LC},
+    .sampleRateHz = {44100},
+    .channelMode = {ChannelMode::STEREO},
+    .variableBitRateSupported = true,
+    .bitsPerSample = {16}};
+
+static const LdacCapabilities kDefaultOffloadLdacCapability = {
+    .sampleRateHz = {44100, 48000, 88200, 96000},
+    .channelMode = {LdacChannelMode::DUAL, LdacChannelMode::STEREO},
+    .qualityIndex = {LdacQualityIndex::HIGH},
+    .bitsPerSample = {16, 24, 32}};
+
+static const AptxCapabilities kDefaultOffloadAptxCapability = {
+    .sampleRateHz = {44100, 48000},
+    .channelMode = {ChannelMode::STEREO},
+    .bitsPerSample = {16},
+};
+
+static const AptxCapabilities kDefaultOffloadAptxHdCapability = {
+    .sampleRateHz = {44100, 48000},
+    .channelMode = {ChannelMode::STEREO},
+    .bitsPerSample = {24},
+};
+
+static const OpusCapabilities kDefaultOffloadOpusCapability = {
+    .samplingFrequencyHz = {48000},
+    .frameDurationUs = {10000, 20000},
+    .channelMode = {ChannelMode::MONO, ChannelMode::STEREO},
+};
+
+const std::vector<CodecCapabilities> kDefaultOffloadA2dpCodecCapabilities = {
+    {.codecType = CodecType::SBC, .capabilities = {}},
+    {.codecType = CodecType::AAC, .capabilities = {}},
+    {.codecType = CodecType::LDAC, .capabilities = {}},
+    {.codecType = CodecType::APTX, .capabilities = {}},
+    {.codecType = CodecType::APTX_HD, .capabilities = {}},
+    {.codecType = CodecType::OPUS, .capabilities = {}}};
+
+std::vector<LeAudioCodecCapabilitiesSetting> kDefaultOffloadLeAudioCapabilities;
+
+static const UnicastCapability kInvalidUnicastCapability = {
+    .codecType = CodecType::UNKNOWN};
+
+static const BroadcastCapability kInvalidBroadcastCapability = {
+    .codecType = CodecType::UNKNOWN};
+
+// Default Supported Codecs
+// LC3 16_1: sample rate: 16 kHz, frame duration: 7.5 ms, octets per frame: 30
+static const Lc3Capabilities kLc3Capability_16_1 = {
+    .samplingFrequencyHz = {16000},
+    .frameDurationUs = {7500},
+    .octetsPerFrame = {30}};
+
+// Default Supported Codecs
+// LC3 16_2: sample rate: 16 kHz, frame duration: 10 ms, octets per frame: 40
+static const Lc3Capabilities kLc3Capability_16_2 = {
+    .samplingFrequencyHz = {16000},
+    .frameDurationUs = {10000},
+    .octetsPerFrame = {40}};
+
+// Default Supported Codecs
+// LC3 24_2: sample rate: 24 kHz, frame duration: 10 ms, octets per frame: 60
+static const Lc3Capabilities kLc3Capability_24_2 = {
+    .samplingFrequencyHz = {24000},
+    .frameDurationUs = {10000},
+    .octetsPerFrame = {60}};
+
+// Default Supported Codecs
+// LC3 32_2: sample rate: 32 kHz, frame duration: 10 ms, octets per frame: 80
+static const Lc3Capabilities kLc3Capability_32_2 = {
+    .samplingFrequencyHz = {32000},
+    .frameDurationUs = {10000},
+    .octetsPerFrame = {80}};
+
+// Default Supported Codecs
+// LC3 48_4: sample rate: 48 kHz, frame duration: 10 ms, octets per frame: 120
+static const Lc3Capabilities kLc3Capability_48_4 = {
+    .samplingFrequencyHz = {48000},
+    .frameDurationUs = {10000},
+    .octetsPerFrame = {120}};
+
+static const std::vector<Lc3Capabilities> supportedLc3CapabilityList = {
+    kLc3Capability_48_4, kLc3Capability_32_2, kLc3Capability_24_2,
+    kLc3Capability_16_2, kLc3Capability_16_1};
+
+static AudioLocation stereoAudio = static_cast<AudioLocation>(
+    static_cast<uint8_t>(AudioLocation::FRONT_LEFT) |
+    static_cast<uint8_t>(AudioLocation::FRONT_RIGHT));
+static AudioLocation monoAudio = AudioLocation::UNKNOWN;
+
+// Stores the supported setting of audio location, connected device, and the
+// channel count for each device
+std::vector<std::tuple<AudioLocation, uint8_t, uint8_t>>
+    supportedDeviceSetting = {
+        // Stereo, two connected device, one for L one for R
+        std::make_tuple(stereoAudio, 2, 1),
+        // Stereo, one connected device for both L and R
+        std::make_tuple(stereoAudio, 1, 2),
+        // Mono
+        std::make_tuple(monoAudio, 1, 1)};
+
+template <class T>
+bool BluetoothAudioCodecs::ContainedInVector(
+    const std::vector<T>& vector, const typename identity<T>::type& target) {
+  return std::find(vector.begin(), vector.end(), target) != vector.end();
+}
+
+bool BluetoothAudioCodecs::IsOffloadSbcConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getTag() != CodecConfiguration::CodecSpecific::sbcConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << codec_specific.toString();
+    return false;
+  }
+  const SbcConfiguration sbc_data =
+      codec_specific.get<CodecConfiguration::CodecSpecific::sbcConfig>();
+
+  if (ContainedInVector(kDefaultOffloadSbcCapability.sampleRateHz,
+                        sbc_data.sampleRateHz) &&
+      ContainedInVector(kDefaultOffloadSbcCapability.blockLength,
+                        sbc_data.blockLength) &&
+      ContainedInVector(kDefaultOffloadSbcCapability.numSubbands,
+                        sbc_data.numSubbands) &&
+      ContainedInVector(kDefaultOffloadSbcCapability.bitsPerSample,
+                        sbc_data.bitsPerSample) &&
+      ContainedInVector(kDefaultOffloadSbcCapability.channelMode,
+                        sbc_data.channelMode) &&
+      ContainedInVector(kDefaultOffloadSbcCapability.allocMethod,
+                        sbc_data.allocMethod) &&
+      sbc_data.minBitpool <= sbc_data.maxBitpool &&
+      kDefaultOffloadSbcCapability.minBitpool <= sbc_data.minBitpool &&
+      kDefaultOffloadSbcCapability.maxBitpool >= sbc_data.maxBitpool) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << codec_specific.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadAacConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getTag() != CodecConfiguration::CodecSpecific::aacConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << codec_specific.toString();
+    return false;
+  }
+  const AacConfiguration aac_data =
+      codec_specific.get<CodecConfiguration::CodecSpecific::aacConfig>();
+
+  if (ContainedInVector(kDefaultOffloadAacCapability.sampleRateHz,
+                        aac_data.sampleRateHz) &&
+      ContainedInVector(kDefaultOffloadAacCapability.bitsPerSample,
+                        aac_data.bitsPerSample) &&
+      ContainedInVector(kDefaultOffloadAacCapability.channelMode,
+                        aac_data.channelMode) &&
+      ContainedInVector(kDefaultOffloadAacCapability.objectType,
+                        aac_data.objectType) &&
+      (!aac_data.variableBitRateEnabled ||
+       kDefaultOffloadAacCapability.variableBitRateSupported)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << codec_specific.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadLdacConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getTag() !=
+      CodecConfiguration::CodecSpecific::ldacConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << codec_specific.toString();
+    return false;
+  }
+  const LdacConfiguration ldac_data =
+      codec_specific.get<CodecConfiguration::CodecSpecific::ldacConfig>();
+
+  if (ContainedInVector(kDefaultOffloadLdacCapability.sampleRateHz,
+                        ldac_data.sampleRateHz) &&
+      ContainedInVector(kDefaultOffloadLdacCapability.bitsPerSample,
+                        ldac_data.bitsPerSample) &&
+      ContainedInVector(kDefaultOffloadLdacCapability.channelMode,
+                        ldac_data.channelMode) &&
+      ContainedInVector(kDefaultOffloadLdacCapability.qualityIndex,
+                        ldac_data.qualityIndex)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << codec_specific.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadAptxConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getTag() !=
+      CodecConfiguration::CodecSpecific::aptxConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << codec_specific.toString();
+    return false;
+  }
+  const AptxConfiguration aptx_data =
+      codec_specific.get<CodecConfiguration::CodecSpecific::aptxConfig>();
+
+  if (ContainedInVector(kDefaultOffloadAptxCapability.sampleRateHz,
+                        aptx_data.sampleRateHz) &&
+      ContainedInVector(kDefaultOffloadAptxCapability.bitsPerSample,
+                        aptx_data.bitsPerSample) &&
+      ContainedInVector(kDefaultOffloadAptxCapability.channelMode,
+                        aptx_data.channelMode)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << codec_specific.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadAptxHdConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getTag() !=
+      CodecConfiguration::CodecSpecific::aptxConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << codec_specific.toString();
+    return false;
+  }
+  const AptxConfiguration aptx_data =
+      codec_specific.get<CodecConfiguration::CodecSpecific::aptxConfig>();
+
+  if (ContainedInVector(kDefaultOffloadAptxHdCapability.sampleRateHz,
+                        aptx_data.sampleRateHz) &&
+      ContainedInVector(kDefaultOffloadAptxHdCapability.bitsPerSample,
+                        aptx_data.bitsPerSample) &&
+      ContainedInVector(kDefaultOffloadAptxHdCapability.channelMode,
+                        aptx_data.channelMode)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << codec_specific.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadOpusConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getTag() !=
+      CodecConfiguration::CodecSpecific::opusConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << codec_specific.toString();
+    return false;
+  }
+  std::optional<OpusConfiguration> opus_data =
+      codec_specific.get<CodecConfiguration::CodecSpecific::opusConfig>();
+
+  if (opus_data.has_value() &&
+      ContainedInVector(kDefaultOffloadOpusCapability.samplingFrequencyHz,
+                        opus_data->samplingFrequencyHz) &&
+      ContainedInVector(kDefaultOffloadOpusCapability.frameDurationUs,
+                        opus_data->frameDurationUs) &&
+      ContainedInVector(kDefaultOffloadOpusCapability.channelMode,
+                        opus_data->channelMode)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << codec_specific.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadLeAudioConfigurationValid(
+    const SessionType& session_type, const LeAudioConfiguration&) {
+  if (session_type !=
+          SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH &&
+      session_type !=
+          SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH &&
+      session_type !=
+          SessionType::LE_AUDIO_BROADCAST_HARDWARE_OFFLOAD_ENCODING_DATAPATH) {
+    return false;
+  }
+  return true;
+}
+
+std::vector<PcmCapabilities>
+BluetoothAudioCodecs::GetSoftwarePcmCapabilities() {
+  return {kDefaultSoftwarePcmCapabilities};
+}
+
+std::vector<CodecCapabilities>
+BluetoothAudioCodecs::GetA2dpOffloadCodecCapabilities(
+    const SessionType& session_type) {
+  if (session_type != SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH &&
+      session_type != SessionType::A2DP_HARDWARE_OFFLOAD_DECODING_DATAPATH) {
+    return {};
+  }
+  std::vector<CodecCapabilities> offload_a2dp_codec_capabilities =
+      kDefaultOffloadA2dpCodecCapabilities;
+  for (auto& codec_capability : offload_a2dp_codec_capabilities) {
+    switch (codec_capability.codecType) {
+      case CodecType::SBC:
+        codec_capability.capabilities
+            .set<CodecCapabilities::Capabilities::sbcCapabilities>(
+                kDefaultOffloadSbcCapability);
+        break;
+      case CodecType::AAC:
+        codec_capability.capabilities
+            .set<CodecCapabilities::Capabilities::aacCapabilities>(
+                kDefaultOffloadAacCapability);
+        break;
+      case CodecType::LDAC:
+        codec_capability.capabilities
+            .set<CodecCapabilities::Capabilities::ldacCapabilities>(
+                kDefaultOffloadLdacCapability);
+        break;
+      case CodecType::APTX:
+        codec_capability.capabilities
+            .set<CodecCapabilities::Capabilities::aptxCapabilities>(
+                kDefaultOffloadAptxCapability);
+        break;
+      case CodecType::APTX_HD:
+        codec_capability.capabilities
+            .set<CodecCapabilities::Capabilities::aptxCapabilities>(
+                kDefaultOffloadAptxHdCapability);
+        break;
+      case CodecType::OPUS:
+        codec_capability.capabilities
+            .set<CodecCapabilities::Capabilities::opusCapabilities>(
+                kDefaultOffloadOpusCapability);
+        break;
+      case CodecType::UNKNOWN:
+      case CodecType::VENDOR:
+      case CodecType::LC3:
+      case CodecType::APTX_ADAPTIVE:
+        break;
+    }
+  }
+  return offload_a2dp_codec_capabilities;
+}
+
+bool BluetoothAudioCodecs::IsSoftwarePcmConfigurationValid(
+    const PcmConfiguration& pcm_config) {
+  if (ContainedInVector(kDefaultSoftwarePcmCapabilities.sampleRateHz,
+                        pcm_config.sampleRateHz) &&
+      ContainedInVector(kDefaultSoftwarePcmCapabilities.bitsPerSample,
+                        pcm_config.bitsPerSample) &&
+      ContainedInVector(kDefaultSoftwarePcmCapabilities.channelMode,
+                        pcm_config.channelMode)
+      // data interval is not checked for now
+      // && pcm_config.dataIntervalUs != 0
+  ) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << pcm_config.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadCodecConfigurationValid(
+    const SessionType& session_type, const CodecConfiguration& codec_config) {
+  if (session_type != SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH &&
+      session_type != SessionType::A2DP_HARDWARE_OFFLOAD_DECODING_DATAPATH) {
+    LOG(ERROR) << __func__
+               << ": Invalid SessionType=" << toString(session_type);
+    return false;
+  }
+  const CodecConfiguration::CodecSpecific& codec_specific = codec_config.config;
+  switch (codec_config.codecType) {
+    case CodecType::SBC:
+      if (IsOffloadSbcConfigurationValid(codec_specific)) {
+        return true;
+      }
+      break;
+    case CodecType::AAC:
+      if (IsOffloadAacConfigurationValid(codec_specific)) {
+        return true;
+      }
+      break;
+    case CodecType::LDAC:
+      if (IsOffloadLdacConfigurationValid(codec_specific)) {
+        return true;
+      }
+      break;
+    case CodecType::APTX:
+      if (IsOffloadAptxConfigurationValid(codec_specific)) {
+        return true;
+      }
+      break;
+    case CodecType::APTX_HD:
+      if (IsOffloadAptxHdConfigurationValid(codec_specific)) {
+        return true;
+      }
+      break;
+    case CodecType::OPUS:
+      if (IsOffloadOpusConfigurationValid(codec_specific)) {
+        return true;
+      }
+      break;
+    case CodecType::APTX_ADAPTIVE:
+    case CodecType::LC3:
+    case CodecType::UNKNOWN:
+    case CodecType::VENDOR:
+      break;
+  }
+  return false;
+}
+
+UnicastCapability composeUnicastLc3Capability(
+    AudioLocation audioLocation, uint8_t deviceCnt, uint8_t channelCount,
+    const Lc3Capabilities& capability) {
+  return {
+      .codecType = CodecType::LC3,
+      .supportedChannel = audioLocation,
+      .deviceCount = deviceCnt,
+      .channelCountPerDevice = channelCount,
+      .leAudioCodecCapabilities =
+          UnicastCapability::LeAudioCodecCapabilities(capability),
+  };
+}
+
+std::vector<LeAudioCodecCapabilitiesSetting>
+BluetoothAudioCodecs::GetLeAudioOffloadCodecCapabilities(
+    const SessionType& session_type) {
+  if (session_type !=
+          SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH &&
+      session_type !=
+          SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH &&
+      session_type !=
+          SessionType::LE_AUDIO_BROADCAST_HARDWARE_OFFLOAD_ENCODING_DATAPATH) {
+    return std::vector<LeAudioCodecCapabilitiesSetting>(0);
+  }
+
+  if (kDefaultOffloadLeAudioCapabilities.empty()) {
+    for (auto [audioLocation, deviceCnt, channelCount] :
+         supportedDeviceSetting) {
+      for (auto capability : supportedLc3CapabilityList) {
+        UnicastCapability lc3Capability = composeUnicastLc3Capability(
+            audioLocation, deviceCnt, channelCount, capability);
+        UnicastCapability lc3MonoDecodeCapability =
+            composeUnicastLc3Capability(monoAudio, 1, 1, capability);
+
+        // Adds the capability for encode only
+        kDefaultOffloadLeAudioCapabilities.push_back(
+            {.unicastEncodeCapability = lc3Capability,
+             .unicastDecodeCapability = kInvalidUnicastCapability,
+             .broadcastCapability = kInvalidBroadcastCapability});
+
+        // Adds the capability for decode only
+        kDefaultOffloadLeAudioCapabilities.push_back(
+            {.unicastEncodeCapability = kInvalidUnicastCapability,
+             .unicastDecodeCapability = lc3Capability,
+             .broadcastCapability = kInvalidBroadcastCapability});
+
+        // Adds the capability for the case that encode and decode exist at the
+        // same time
+        kDefaultOffloadLeAudioCapabilities.push_back(
+            {.unicastEncodeCapability = lc3Capability,
+             .unicastDecodeCapability = lc3MonoDecodeCapability,
+             .broadcastCapability = kInvalidBroadcastCapability});
+      }
+    }
+  }
+
+  return kDefaultOffloadLeAudioCapabilities;
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/utils/aidl_session/BluetoothAudioCodecs.h

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <aidl/android/hardware/bluetooth/audio/CodecCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/CodecConfiguration.h>
+#include <aidl/android/hardware/bluetooth/audio/LeAudioCodecCapabilitiesSetting.h>
+#include <aidl/android/hardware/bluetooth/audio/LeAudioConfiguration.h>
+#include <aidl/android/hardware/bluetooth/audio/OpusConfiguration.h>
+#include <aidl/android/hardware/bluetooth/audio/PcmCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/PcmConfiguration.h>
+#include <aidl/android/hardware/bluetooth/audio/SessionType.h>
+
+#include <vector>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioCodecs {
+ public:
+  static std::vector<PcmCapabilities> GetSoftwarePcmCapabilities();
+  static std::vector<CodecCapabilities> GetA2dpOffloadCodecCapabilities(
+      const SessionType& session_type);
+
+  static bool IsSoftwarePcmConfigurationValid(
+      const PcmConfiguration& pcm_config);
+  static bool IsOffloadCodecConfigurationValid(
+      const SessionType& session_type, const CodecConfiguration& codec_config);
+
+  static bool IsOffloadLeAudioConfigurationValid(
+      const SessionType& session_type, const LeAudioConfiguration&);
+
+  static std::vector<LeAudioCodecCapabilitiesSetting>
+  GetLeAudioOffloadCodecCapabilities(const SessionType& session_type);
+
+ private:
+  template <typename T>
+  struct identity {
+    typedef T type;
+  };
+  template <class T>
+  static bool ContainedInVector(const std::vector<T>& vector,
+                                const typename identity<T>::type& target);
+  template <class T>
+  static bool ContainedInBitmask(const T& bitmask, const T& target);
+  static bool IsSingleBit(uint32_t bitmasks, uint32_t bitfield);
+  static bool IsOffloadSbcConfigurationValid(
+      const CodecConfiguration::CodecSpecific& codec_specific);
+  static bool IsOffloadAacConfigurationValid(
+      const CodecConfiguration::CodecSpecific& codec_specific);
+  static bool IsOffloadLdacConfigurationValid(
+      const CodecConfiguration::CodecSpecific& codec_specific);
+  static bool IsOffloadAptxConfigurationValid(
+      const CodecConfiguration::CodecSpecific& codec_specific);
+  static bool IsOffloadAptxHdConfigurationValid(
+      const CodecConfiguration::CodecSpecific& codec_specific);
+  static bool IsOffloadOpusConfigurationValid(
+      const CodecConfiguration::CodecSpecific& codec_specific);
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/utils/aidl_session/BluetoothAudioSession.cpp

@@ -0,0 +1,618 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <sys/types.h>
+#define LOG_TAG "BTAudioSessionAidl"
+
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <android/binder_manager.h>
+
+#include "BluetoothAudioSession.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+static constexpr int kFmqSendTimeoutMs = 1000;  // 1000 ms timeout for sending
+static constexpr int kFmqReceiveTimeoutMs =
+    1000;                               // 1000 ms timeout for receiving
+static constexpr int kWritePollMs = 1;  // polled non-blocking interval
+static constexpr int kReadPollMs = 1;   // polled non-blocking interval
+
+BluetoothAudioSession::BluetoothAudioSession(const SessionType& session_type)
+    : session_type_(session_type), stack_iface_(nullptr), data_mq_(nullptr) {}
+
+/***
+ *
+ * Callback methods
+ *
+ ***/
+
+void BluetoothAudioSession::OnSessionStarted(
+    const std::shared_ptr<IBluetoothAudioPort> stack_iface,
+    const DataMQDesc* mq_desc, const AudioConfiguration& audio_config,
+    const std::vector<LatencyMode>& latency_modes) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (stack_iface == nullptr) {
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_)
+               << ", IBluetoothAudioPort Invalid";
+  } else if (!UpdateAudioConfig(audio_config)) {
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_)
+               << ", AudioConfiguration=" << audio_config.toString()
+               << " Invalid";
+  } else if (!UpdateDataPath(mq_desc)) {
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_)
+               << " MqDescriptor Invalid";
+    audio_config_ = nullptr;
+  } else {
+    stack_iface_ = stack_iface;
+    latency_modes_ = latency_modes;
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << ", AudioConfiguration=" << audio_config.toString();
+    ReportSessionStatus();
+  }
+}
+
+void BluetoothAudioSession::OnSessionEnded() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  bool toggled = IsSessionReady();
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_);
+  audio_config_ = nullptr;
+  stack_iface_ = nullptr;
+  UpdateDataPath(nullptr);
+  if (toggled) {
+    ReportSessionStatus();
+  }
+}
+
+/***
+ *
+ * Util methods
+ *
+ ***/
+
+const AudioConfiguration BluetoothAudioSession::GetAudioConfig() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    switch (session_type_) {
+      case SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH:
+      case SessionType::A2DP_HARDWARE_OFFLOAD_DECODING_DATAPATH:
+        return AudioConfiguration(CodecConfiguration{});
+      case SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH:
+      case SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH:
+        return AudioConfiguration(LeAudioConfiguration{});
+      case SessionType::LE_AUDIO_BROADCAST_HARDWARE_OFFLOAD_ENCODING_DATAPATH:
+        return AudioConfiguration(LeAudioBroadcastConfiguration{});
+      default:
+        return AudioConfiguration(PcmConfiguration{});
+    }
+  }
+  return *audio_config_;
+}
+
+void BluetoothAudioSession::ReportAudioConfigChanged(
+    const AudioConfiguration& audio_config) {
+  if (session_type_ !=
+          SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH &&
+      session_type_ !=
+          SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH) {
+    return;
+  }
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  audio_config_ = std::make_unique<AudioConfiguration>(audio_config);
+  if (observers_.empty()) {
+    LOG(WARNING) << __func__ << " - SessionType=" << toString(session_type_)
+                 << " has NO port state observer";
+    return;
+  }
+  for (auto& observer : observers_) {
+    uint16_t cookie = observer.first;
+    std::shared_ptr<struct PortStatusCallbacks> cb = observer.second;
+    LOG(INFO) << __func__ << " for SessionType=" << toString(session_type_)
+              << ", bluetooth_audio=0x"
+              << ::android::base::StringPrintf("%04x", cookie);
+    if (cb->audio_configuration_changed_cb_ != nullptr) {
+      cb->audio_configuration_changed_cb_(cookie);
+    }
+  }
+}
+
+bool BluetoothAudioSession::IsSessionReady() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+
+  bool is_mq_valid =
+      (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+       session_type_ ==
+           SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+       session_type_ ==
+           SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH ||
+       session_type_ ==
+           SessionType::LE_AUDIO_BROADCAST_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+       session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_DECODING_DATAPATH ||
+       (data_mq_ != nullptr && data_mq_->isValid()));
+  return stack_iface_ != nullptr && is_mq_valid && audio_config_ != nullptr;
+}
+
+/***
+ *
+ * Status callback methods
+ *
+ ***/
+
+uint16_t BluetoothAudioSession::RegisterStatusCback(
+    const PortStatusCallbacks& callbacks) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  uint16_t cookie = ObserversCookieGetInitValue(session_type_);
+  uint16_t cookie_upper_bound = ObserversCookieGetUpperBound(session_type_);
+
+  while (cookie < cookie_upper_bound) {
+    if (observers_.find(cookie) == observers_.end()) {
+      break;
+    }
+    ++cookie;
+  }
+  if (cookie >= cookie_upper_bound) {
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has " << observers_.size()
+               << " observers already (No Resource)";
+    return kObserversCookieUndefined;
+  }
+  std::shared_ptr<PortStatusCallbacks> cb =
+      std::make_shared<PortStatusCallbacks>();
+  *cb = callbacks;
+  observers_[cookie] = cb;
+  return cookie;
+}
+
+void BluetoothAudioSession::UnregisterStatusCback(uint16_t cookie) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (observers_.erase(cookie) != 1) {
+    LOG(WARNING) << __func__ << " - SessionType=" << toString(session_type_)
+                 << " no such provider=0x"
+                 << ::android::base::StringPrintf("%04x", cookie);
+  }
+}
+
+/***
+ *
+ * Stream methods
+ *
+ ***/
+
+bool BluetoothAudioSession::StartStream(bool is_low_latency) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return false;
+  }
+  auto hal_retval = stack_iface_->startStream(is_low_latency);
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+    return false;
+  }
+  return true;
+}
+
+bool BluetoothAudioSession::SuspendStream() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return false;
+  }
+  auto hal_retval = stack_iface_->suspendStream();
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+    return false;
+  }
+  return true;
+}
+
+void BluetoothAudioSession::StopStream() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    return;
+  }
+  auto hal_retval = stack_iface_->stopStream();
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+  }
+}
+
+/***
+ *
+ * Private methods
+ *
+ ***/
+
+bool BluetoothAudioSession::UpdateDataPath(const DataMQDesc* mq_desc) {
+  if (mq_desc == nullptr) {
+    // usecase of reset by nullptr
+    data_mq_ = nullptr;
+    return true;
+  }
+  std::unique_ptr<DataMQ> temp_mq;
+  temp_mq.reset(new DataMQ(*mq_desc));
+  if (!temp_mq || !temp_mq->isValid()) {
+    data_mq_ = nullptr;
+    return false;
+  }
+  data_mq_ = std::move(temp_mq);
+  return true;
+}
+
+bool BluetoothAudioSession::UpdateAudioConfig(
+    const AudioConfiguration& audio_config) {
+  bool is_software_session =
+      (session_type_ == SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+       session_type_ == SessionType::HEARING_AID_SOFTWARE_ENCODING_DATAPATH ||
+       session_type_ == SessionType::LE_AUDIO_SOFTWARE_DECODING_DATAPATH ||
+       session_type_ == SessionType::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH ||
+       session_type_ ==
+           SessionType::LE_AUDIO_BROADCAST_SOFTWARE_ENCODING_DATAPATH ||
+       session_type_ == SessionType::A2DP_SOFTWARE_DECODING_DATAPATH);
+  bool is_offload_a2dp_session =
+      (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+       session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_DECODING_DATAPATH);
+  bool is_offload_le_audio_session =
+      (session_type_ ==
+           SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+       session_type_ ==
+           SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH);
+  auto audio_config_tag = audio_config.getTag();
+  bool is_software_audio_config =
+      (is_software_session &&
+       audio_config_tag == AudioConfiguration::pcmConfig);
+  bool is_a2dp_offload_audio_config =
+      (is_offload_a2dp_session &&
+       audio_config_tag == AudioConfiguration::a2dpConfig);
+  bool is_le_audio_offload_audio_config =
+      (is_offload_le_audio_session &&
+       audio_config_tag == AudioConfiguration::leAudioConfig);
+  if (!is_software_audio_config && !is_a2dp_offload_audio_config &&
+      !is_le_audio_offload_audio_config) {
+    return false;
+  }
+  audio_config_ = std::make_unique<AudioConfiguration>(audio_config);
+  return true;
+}
+
+void BluetoothAudioSession::ReportSessionStatus() {
+  // This is locked already by OnSessionStarted / OnSessionEnded
+  if (observers_.empty()) {
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << " has NO port state observer";
+    return;
+  }
+  for (auto& observer : observers_) {
+    uint16_t cookie = observer.first;
+    std::shared_ptr<PortStatusCallbacks> callback = observer.second;
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << " notify to bluetooth_audio=0x"
+              << ::android::base::StringPrintf("%04x", cookie);
+    callback->session_changed_cb_(cookie);
+  }
+}
+
+/***
+ *
+ * PCM methods
+ *
+ ***/
+
+size_t BluetoothAudioSession::OutWritePcmData(const void* buffer,
+                                              size_t bytes) {
+  if (buffer == nullptr || bytes <= 0) {
+    return 0;
+  }
+  size_t total_written = 0;
+  int timeout_ms = kFmqSendTimeoutMs;
+  do {
+    std::unique_lock<std::recursive_mutex> lock(mutex_);
+    if (!IsSessionReady()) {
+      break;
+    }
+    size_t num_bytes_to_write = data_mq_->availableToWrite();
+    if (num_bytes_to_write) {
+      if (num_bytes_to_write > (bytes - total_written)) {
+        num_bytes_to_write = bytes - total_written;
+      }
+
+      if (!data_mq_->write(
+              static_cast<const MQDataType*>(buffer) + total_written,
+              num_bytes_to_write)) {
+        LOG(ERROR) << "FMQ datapath writing " << total_written << "/" << bytes
+                   << " failed";
+        return total_written;
+      }
+      total_written += num_bytes_to_write;
+    } else if (timeout_ms >= kWritePollMs) {
+      lock.unlock();
+      usleep(kWritePollMs * 1000);
+      timeout_ms -= kWritePollMs;
+    } else {
+      LOG(DEBUG) << "Data " << total_written << "/" << bytes << " overflow "
+                 << (kFmqSendTimeoutMs - timeout_ms) << " ms";
+      return total_written;
+    }
+  } while (total_written < bytes);
+  return total_written;
+}
+
+size_t BluetoothAudioSession::InReadPcmData(void* buffer, size_t bytes) {
+  if (buffer == nullptr || bytes <= 0) {
+    return 0;
+  }
+  size_t total_read = 0;
+  int timeout_ms = kFmqReceiveTimeoutMs;
+  do {
+    std::unique_lock<std::recursive_mutex> lock(mutex_);
+    if (!IsSessionReady()) {
+      break;
+    }
+    size_t num_bytes_to_read = data_mq_->availableToRead();
+    if (num_bytes_to_read) {
+      if (num_bytes_to_read > (bytes - total_read)) {
+        num_bytes_to_read = bytes - total_read;
+      }
+      if (!data_mq_->read(static_cast<MQDataType*>(buffer) + total_read,
+                          num_bytes_to_read)) {
+        LOG(ERROR) << "FMQ datapath reading " << total_read << "/" << bytes
+                   << " failed";
+        return total_read;
+      }
+      total_read += num_bytes_to_read;
+    } else if (timeout_ms >= kReadPollMs) {
+      lock.unlock();
+      usleep(kReadPollMs * 1000);
+      timeout_ms -= kReadPollMs;
+      continue;
+    } else {
+      LOG(DEBUG) << "Data " << total_read << "/" << bytes << " overflow "
+                 << (kFmqReceiveTimeoutMs - timeout_ms) << " ms";
+      return total_read;
+    }
+  } while (total_read < bytes);
+  return total_read;
+}
+
+/***
+ *
+ * Other methods
+ *
+ ***/
+
+void BluetoothAudioSession::ReportControlStatus(bool start_resp,
+                                                BluetoothAudioStatus status) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (observers_.empty()) {
+    LOG(WARNING) << __func__ << " - SessionType=" << toString(session_type_)
+                 << " has NO port state observer";
+    return;
+  }
+  for (auto& observer : observers_) {
+    uint16_t cookie = observer.first;
+    std::shared_ptr<PortStatusCallbacks> callback = observer.second;
+    LOG(INFO) << __func__ << " - status=" << toString(status)
+              << " for SessionType=" << toString(session_type_)
+              << ", bluetooth_audio=0x"
+              << ::android::base::StringPrintf("%04x", cookie)
+              << (start_resp ? " started" : " suspended");
+    callback->control_result_cb_(cookie, start_resp, status);
+  }
+}
+
+void BluetoothAudioSession::ReportLowLatencyModeAllowedChanged(bool allowed) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  low_latency_allowed_ = allowed;
+  if (observers_.empty()) {
+    LOG(WARNING) << __func__ << " - SessionType=" << toString(session_type_)
+                 << " has NO port state observer";
+    return;
+  }
+  for (auto& observer : observers_) {
+    uint16_t cookie = observer.first;
+    std::shared_ptr<PortStatusCallbacks> callback = observer.second;
+    LOG(INFO) << __func__
+              << " - allowed=" << (allowed ? " allowed" : " disallowed");
+    if (callback->low_latency_mode_allowed_cb_ != nullptr) {
+      callback->low_latency_mode_allowed_cb_(cookie, allowed);
+    }
+  }
+}
+
+bool BluetoothAudioSession::GetPresentationPosition(
+    PresentationPosition& presentation_position) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return false;
+  }
+  bool retval = false;
+
+  if (!stack_iface_->getPresentationPosition(&presentation_position).isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+    return false;
+  }
+  return retval;
+}
+
+void BluetoothAudioSession::UpdateSourceMetadata(
+    const struct source_metadata& source_metadata) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return;
+  }
+
+  ssize_t track_count = source_metadata.track_count;
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_) << ","
+            << track_count << " track(s)";
+  if (session_type_ == SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+      session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+      session_type_ == SessionType::A2DP_SOFTWARE_DECODING_DATAPATH ||
+      session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_DECODING_DATAPATH) {
+    return;
+  }
+
+  SourceMetadata hal_source_metadata;
+  hal_source_metadata.tracks.resize(track_count);
+  for (int i = 0; i < track_count; i++) {
+    hal_source_metadata.tracks[i].usage =
+        static_cast<media::audio::common::AudioUsage>(
+            source_metadata.tracks[i].usage);
+    hal_source_metadata.tracks[i].contentType =
+        static_cast<media::audio::common::AudioContentType>(
+            source_metadata.tracks[i].content_type);
+    hal_source_metadata.tracks[i].gain = source_metadata.tracks[i].gain;
+    LOG(VERBOSE) << __func__ << " - SessionType=" << toString(session_type_)
+                 << ", usage=" << toString(hal_source_metadata.tracks[i].usage)
+                 << ", content="
+                 << toString(hal_source_metadata.tracks[i].contentType)
+                 << ", gain=" << hal_source_metadata.tracks[i].gain;
+  }
+
+  auto hal_retval = stack_iface_->updateSourceMetadata(hal_source_metadata);
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+  }
+}
+
+void BluetoothAudioSession::UpdateSinkMetadata(
+    const struct sink_metadata& sink_metadata) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return;
+  }
+
+  ssize_t track_count = sink_metadata.track_count;
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_) << ","
+            << track_count << " track(s)";
+  if (session_type_ == SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+      session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+      session_type_ == SessionType::A2DP_SOFTWARE_DECODING_DATAPATH ||
+      session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_DECODING_DATAPATH) {
+    return;
+  }
+
+  SinkMetadata hal_sink_metadata;
+  hal_sink_metadata.tracks.resize(track_count);
+  for (int i = 0; i < track_count; i++) {
+    hal_sink_metadata.tracks[i].source =
+        static_cast<media::audio::common::AudioSource>(
+            sink_metadata.tracks[i].source);
+    hal_sink_metadata.tracks[i].gain = sink_metadata.tracks[i].gain;
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << ", source=" << sink_metadata.tracks[i].source
+              << ", dest_device=" << sink_metadata.tracks[i].dest_device
+              << ", gain=" << sink_metadata.tracks[i].gain
+              << ", dest_device_address="
+              << sink_metadata.tracks[i].dest_device_address;
+  }
+
+  auto hal_retval = stack_iface_->updateSinkMetadata(hal_sink_metadata);
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+  }
+}
+
+std::vector<LatencyMode> BluetoothAudioSession::GetSupportedLatencyModes() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return std::vector<LatencyMode>();
+  }
+  if (low_latency_allowed_) return latency_modes_;
+  std::vector<LatencyMode> modes;
+  for (LatencyMode mode : latency_modes_) {
+    if (mode == LatencyMode::LOW_LATENCY)
+      // ignore those low latency mode if Bluetooth stack doesn't allow
+      continue;
+    modes.push_back(mode);
+  }
+  return modes;
+}
+
+void BluetoothAudioSession::SetLatencyMode(const LatencyMode& latency_mode) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return;
+  }
+
+  auto hal_retval = stack_iface_->setLatencyMode(latency_mode);
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+  }
+}
+
+bool BluetoothAudioSession::IsAidlAvailable() {
+  if (is_aidl_checked) return is_aidl_available;
+  is_aidl_available =
+      (AServiceManager_checkService(
+           kDefaultAudioProviderFactoryInterface.c_str()) != nullptr);
+  is_aidl_checked = true;
+  return is_aidl_available;
+}
+
+/***
+ *
+ * BluetoothAudioSessionInstance
+ *
+ ***/
+std::mutex BluetoothAudioSessionInstance::mutex_;
+std::unordered_map<SessionType, std::shared_ptr<BluetoothAudioSession>>
+    BluetoothAudioSessionInstance::sessions_map_;
+
+std::shared_ptr<BluetoothAudioSession>
+BluetoothAudioSessionInstance::GetSessionInstance(
+    const SessionType& session_type) {
+  std::lock_guard<std::mutex> guard(mutex_);
+
+  if (!sessions_map_.empty()) {
+    auto entry = sessions_map_.find(session_type);
+    if (entry != sessions_map_.end()) {
+      return entry->second;
+    }
+  }
+  std::shared_ptr<BluetoothAudioSession> session_ptr =
+      std::make_shared<BluetoothAudioSession>(session_type);
+  sessions_map_[session_type] = session_ptr;
+  return session_ptr;
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/utils/aidl_session/BluetoothAudioSession.h

@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <aidl/android/hardware/audio/common/SinkMetadata.h>
+#include <aidl/android/hardware/audio/common/SourceMetadata.h>
+#include <aidl/android/hardware/bluetooth/audio/IBluetoothAudioProvider.h>
+#include <aidl/android/hardware/bluetooth/audio/IBluetoothAudioProviderFactory.h>
+#include <aidl/android/hardware/bluetooth/audio/LatencyMode.h>
+#include <aidl/android/hardware/bluetooth/audio/SessionType.h>
+#include <fmq/AidlMessageQueue.h>
+#include <hardware/audio.h>
+
+#include <mutex>
+#include <unordered_map>
+#include <vector>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+using ::aidl::android::hardware::common::fmq::MQDescriptor;
+using ::aidl::android::hardware::common::fmq::SynchronizedReadWrite;
+using ::android::AidlMessageQueue;
+
+using ::aidl::android::hardware::audio::common::SinkMetadata;
+using ::aidl::android::hardware::audio::common::SourceMetadata;
+
+using MQDataType = int8_t;
+using MQDataMode = SynchronizedReadWrite;
+using DataMQ = AidlMessageQueue<MQDataType, MQDataMode>;
+using DataMQDesc =
+    ::aidl::android::hardware::common::fmq::MQDescriptor<MQDataType,
+                                                         MQDataMode>;
+
+static constexpr uint16_t kObserversCookieSize = 0x0010;  // 0x0000 ~ 0x000f
+static constexpr uint16_t kObserversCookieUndefined =
+    (static_cast<uint16_t>(SessionType::UNKNOWN) << 8 & 0xff00);
+inline SessionType ObserversCookieGetSessionType(uint16_t cookie) {
+  return static_cast<SessionType>(cookie >> 8 & 0x00ff);
+}
+inline uint16_t ObserversCookieGetInitValue(SessionType session_type) {
+  return (static_cast<uint16_t>(session_type) << 8 & 0xff00);
+}
+inline uint16_t ObserversCookieGetUpperBound(SessionType session_type) {
+  return (static_cast<uint16_t>(session_type) << 8 & 0xff00) +
+         kObserversCookieSize;
+}
+
+/***
+ * This presents the callbacks of started / suspended and session changed,
+ * and the bluetooth_audio module uses to receive the status notification
+ ***/
+struct PortStatusCallbacks {
+  /***
+   * control_result_cb_ - when the Bluetooth stack reports results of
+   * streamStarted or streamSuspended, the BluetoothAudioProvider will invoke
+   * this callback to report to the bluetooth_audio module.
+   * @param: cookie - indicates which bluetooth_audio output should handle
+   * @param: start_resp - this report is for startStream or not
+   * @param: status - the result of startStream
+   ***/
+  std::function<void(uint16_t cookie, bool start_resp,
+                     BluetoothAudioStatus status)>
+      control_result_cb_;
+  /***
+   * session_changed_cb_ - when the Bluetooth stack start / end session, the
+   * BluetoothAudioProvider will invoke this callback to notify to the
+   * bluetooth_audio module.
+   * @param: cookie - indicates which bluetooth_audio output should handle
+   ***/
+  std::function<void(uint16_t cookie)> session_changed_cb_;
+  /***
+   * audio_configuration_changed_cb_ - when the Bluetooth stack change the audio
+   * configuration, the BluetoothAudioProvider will invoke this callback to
+   * notify to the bluetooth_audio module.
+   * @param: cookie - indicates which bluetooth_audio output should handle
+   ***/
+  std::function<void(uint16_t cookie)> audio_configuration_changed_cb_;
+  /***
+   * low_latency_mode_allowed_cb_ - when the Bluetooth stack low latency mode
+   * allowed or disallowed, the BluetoothAudioProvider will invoke
+   * this callback to report to the bluetooth_audio module.
+   * @param: cookie - indicates which bluetooth_audio output should handle
+   * @param: allowed - indicates if low latency mode is allowed
+   ***/
+  std::function<void(uint16_t cookie, bool allowed)>
+      low_latency_mode_allowed_cb_;
+};
+
+class BluetoothAudioSession {
+ public:
+  BluetoothAudioSession(const SessionType& session_type);
+
+  /***
+   * The function helps to check if this session is ready or not
+   * @return: true if the Bluetooth stack has started the specified session
+   ***/
+  bool IsSessionReady();
+
+  /***
+   * The report function is used to report that the Bluetooth stack has started
+   * this session without any failure, and will invoke session_changed_cb_ to
+   * notify those registered bluetooth_audio outputs
+   ***/
+  void OnSessionStarted(const std::shared_ptr<IBluetoothAudioPort> stack_iface,
+                        const DataMQDesc* mq_desc,
+                        const AudioConfiguration& audio_config,
+                        const std::vector<LatencyMode>& latency_modes);
+
+  /***
+   * The report function is used to report that the Bluetooth stack has ended
+   * the session, and will invoke session_changed_cb_ to notify registered
+   * bluetooth_audio outputs
+   ***/
+  void OnSessionEnded();
+
+  /***
+   * The report function is used to report that the Bluetooth stack has notified
+   * the result of startStream or suspendStream, and will invoke
+   * control_result_cb_ to notify registered bluetooth_audio outputs
+   ***/
+  void ReportControlStatus(bool start_resp, BluetoothAudioStatus status);
+
+  /***
+   * The control function helps the bluetooth_audio module to register
+   * PortStatusCallbacks
+   * @return: cookie - the assigned number to this bluetooth_audio output
+   ***/
+  uint16_t RegisterStatusCback(const PortStatusCallbacks& cbacks);
+
+  /***
+   * The control function helps the bluetooth_audio module to unregister
+   * PortStatusCallbacks
+   * @param: cookie - indicates which bluetooth_audio output is
+   ***/
+  void UnregisterStatusCback(uint16_t cookie);
+
+  /***
+   * The control function is for the bluetooth_audio module to get the current
+   * AudioConfiguration
+   ***/
+  const AudioConfiguration GetAudioConfig();
+
+  /***
+   * The report function is used to report that the Bluetooth stack has notified
+   * the audio configuration changed, and will invoke
+   * audio_configuration_changed_cb_ to notify registered bluetooth_audio
+   * outputs
+   ***/
+  void ReportAudioConfigChanged(const AudioConfiguration& audio_config);
+
+  /***
+   * The report function is used to report that the Bluetooth stack has notified
+   * the low latency mode allowed changed, and will invoke
+   * low_latency_mode_allowed_changed_cb to notify registered bluetooth_audio
+   * outputs
+   ***/
+  void ReportLowLatencyModeAllowedChanged(bool allowed);
+  /***
+   * Those control functions are for the bluetooth_audio module to start,
+   * suspend, stop stream, to check position, and to update metadata.
+   ***/
+  bool StartStream(bool low_latency);
+  bool SuspendStream();
+  void StopStream();
+  bool GetPresentationPosition(PresentationPosition& presentation_position);
+  void UpdateSourceMetadata(const struct source_metadata& source_metadata);
+  void UpdateSinkMetadata(const struct sink_metadata& sink_metadata);
+
+  std::vector<LatencyMode> GetSupportedLatencyModes();
+  void SetLatencyMode(const LatencyMode& latency_mode);
+
+  // The control function writes stream to FMQ
+  size_t OutWritePcmData(const void* buffer, size_t bytes);
+  // The control function read stream from FMQ
+  size_t InReadPcmData(void* buffer, size_t bytes);
+
+  // Return if IBluetoothAudioProviderFactory implementation existed
+  static bool IsAidlAvailable();
+
+ private:
+  // using recursive_mutex to allow hwbinder to re-enter again.
+  std::recursive_mutex mutex_;
+  SessionType session_type_;
+
+  // audio control path to use for both software and offloading
+  std::shared_ptr<IBluetoothAudioPort> stack_iface_;
+  // audio data path (FMQ) for software encoding
+  std::unique_ptr<DataMQ> data_mq_;
+  // audio data configuration for both software and offloading
+  std::unique_ptr<AudioConfiguration> audio_config_;
+  std::vector<LatencyMode> latency_modes_;
+  bool low_latency_allowed_ = true;
+
+  // saving those registered bluetooth_audio's callbacks
+  std::unordered_map<uint16_t, std::shared_ptr<struct PortStatusCallbacks>>
+      observers_;
+
+  bool UpdateDataPath(const DataMQDesc* mq_desc);
+  bool UpdateAudioConfig(const AudioConfiguration& audio_config);
+  // invoking the registered session_changed_cb_
+  void ReportSessionStatus();
+
+  static inline std::atomic<bool> is_aidl_checked = false;
+  static inline std::atomic<bool> is_aidl_available = false;
+  static inline const std::string kDefaultAudioProviderFactoryInterface =
+      std::string() + IBluetoothAudioProviderFactory::descriptor + "/sysbta";
+};
+
+class BluetoothAudioSessionInstance {
+ public:
+  // The API is to fetch the specified session of A2DP / Hearing Aid
+  static std::shared_ptr<BluetoothAudioSession> GetSessionInstance(
+      const SessionType& session_type);
+
+ private:
+  static std::mutex mutex_;
+  static std::unordered_map<SessionType, std::shared_ptr<BluetoothAudioSession>>
+      sessions_map_;
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/utils/aidl_session/BluetoothAudioSessionControl.h

@@ -0,0 +1,209 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioSession.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioSessionControl {
+ public:
+  /***
+   * The control API helps to check if session is ready or not
+   * @return: true if the Bluetooth stack has started th specified session
+   ***/
+  static bool IsSessionReady(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->IsSessionReady();
+    }
+
+    return false;
+  }
+
+  /***
+   * The control API helps the bluetooth_audio module to register
+   * PortStatusCallbacks
+   * @return: cookie - the assigned number to this bluetooth_audio output
+   ***/
+  static uint16_t RegisterControlResultCback(
+      const SessionType& session_type, const PortStatusCallbacks& cbacks) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->RegisterStatusCback(cbacks);
+    }
+    return kObserversCookieUndefined;
+  }
+
+  /***
+   * The control API helps the bluetooth_audio module to unregister
+   * PortStatusCallbacks
+   * @param: cookie - indicates which bluetooth_audio output is
+   ***/
+  static void UnregisterControlResultCback(const SessionType& session_type,
+                                           uint16_t cookie) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->UnregisterStatusCback(cookie);
+    }
+  }
+
+  /***
+   * The control API for the bluetooth_audio module to get current
+   * AudioConfiguration
+   ***/
+  static const AudioConfiguration GetAudioConfig(
+      const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetAudioConfig();
+    }
+    switch (session_type) {
+      case SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH:
+      case SessionType::A2DP_HARDWARE_OFFLOAD_DECODING_DATAPATH:
+        return AudioConfiguration(CodecConfiguration{});
+      case SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH:
+      case SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH:
+        return AudioConfiguration(LeAudioConfiguration{});
+      case SessionType::LE_AUDIO_BROADCAST_HARDWARE_OFFLOAD_ENCODING_DATAPATH:
+        return AudioConfiguration(LeAudioBroadcastConfiguration{});
+      default:
+        return AudioConfiguration(PcmConfiguration{});
+    }
+  }
+
+  /***
+   * Those control APIs for the bluetooth_audio module to start / suspend /
+  stop
+   * stream, to check position, and to update metadata.
+  ***/
+  static bool StartStream(const SessionType& session_type,
+                          bool low_latency = false) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->StartStream(low_latency);
+    }
+    return false;
+  }
+
+  static bool SuspendStream(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->SuspendStream();
+    }
+    return false;
+  }
+
+  static void StopStream(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->StopStream();
+    }
+  }
+
+  static bool GetPresentationPosition(
+      const SessionType& session_type,
+      PresentationPosition& presentation_position) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetPresentationPosition(presentation_position);
+    }
+    return false;
+  }
+
+  static void UpdateSourceMetadata(
+      const SessionType& session_type,
+      const struct source_metadata& source_metadata) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->UpdateSourceMetadata(source_metadata);
+    }
+  }
+
+  static void UpdateSinkMetadata(const SessionType& session_type,
+                                 const struct sink_metadata& sink_metadata) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->UpdateSinkMetadata(sink_metadata);
+    }
+  }
+
+  static std::vector<LatencyMode> GetSupportedLatencyModes(
+      const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetSupportedLatencyModes();
+    }
+    return std::vector<LatencyMode>();
+  }
+
+  static void SetLatencyMode(const SessionType& session_type,
+                             const LatencyMode& latency_mode) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->SetLatencyMode(latency_mode);
+    }
+  }
+
+  /***
+   * The control API writes stream to FMQ
+   ***/
+  static size_t OutWritePcmData(const SessionType& session_type,
+                                const void* buffer, size_t bytes) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->OutWritePcmData(buffer, bytes);
+    }
+    return 0;
+  }
+
+  /***
+   * The control API reads stream from FMQ
+   ***/
+  static size_t InReadPcmData(const SessionType& session_type, void* buffer,
+                              size_t bytes) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->InReadPcmData(buffer, bytes);
+    }
+    return 0;
+  }
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/utils/aidl_session/BluetoothAudioSessionReport.h

@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioSession.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioSessionReport {
+ public:
+  /***
+   * The API reports the Bluetooth stack has started the session, and will
+   * inform registered bluetooth_audio outputs
+   ***/
+  static void OnSessionStarted(
+      const SessionType& session_type,
+      const std::shared_ptr<IBluetoothAudioPort> host_iface,
+      const DataMQDesc* data_mq, const AudioConfiguration& audio_config,
+      const std::vector<LatencyMode>& latency_modes) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->OnSessionStarted(host_iface, data_mq, audio_config,
+                                    latency_modes);
+    }
+  }
+
+  /***
+   * The API reports the Bluetooth stack has ended the session, and will
+   * inform registered bluetooth_audio outputs
+   ***/
+  static void OnSessionEnded(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->OnSessionEnded();
+    }
+  }
+
+  /***
+   * The API reports the Bluetooth stack has replied the result of startStream
+   * or suspendStream, and will inform registered bluetooth_audio outputs
+   ***/
+  static void ReportControlStatus(const SessionType& session_type,
+                                  const bool& start_resp,
+                                  BluetoothAudioStatus status) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->ReportControlStatus(start_resp, status);
+    }
+  }
+  /***
+   * The API reports the Bluetooth stack has replied the changed of the audio
+   * configuration, and will inform registered bluetooth_audio outputs
+   ***/
+  static void ReportAudioConfigChanged(const SessionType& session_type,
+                                       const AudioConfiguration& audio_config) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->ReportAudioConfigChanged(audio_config);
+    }
+  }
+  /***
+   * The API reports the Bluetooth stack has replied the changed of the low
+   * latency audio allowed, and will inform registered bluetooth_audio outputs
+   ***/
+  static void ReportLowLatencyModeAllowedChanged(
+    const SessionType& session_type, bool allowed) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->ReportLowLatencyModeAllowedChanged(allowed);
+    }
+  }
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware.cpp

@@ -0,0 +1,632 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BtAudioNakahara"
+
+#include <aidl/android/hardware/bluetooth/audio/AudioConfiguration.h>
+#include <aidl/android/hardware/bluetooth/audio/BluetoothAudioStatus.h>
+#include <aidl/android/hardware/bluetooth/audio/SessionType.h>
+#include <android-base/logging.h>
+
+#include <functional>
+#include <unordered_map>
+
+#include "../aidl_session/BluetoothAudioSession.h"
+#include "../aidl_session/BluetoothAudioSessionControl.h"
+#include "HidlToAidlMiddleware_2_0.h"
+#include "HidlToAidlMiddleware_2_1.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+using HidlStatus = ::android::hardware::bluetooth::audio::V2_0::Status;
+using PcmConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::PcmParameters;
+using SampleRate_2_0 = ::android::hardware::bluetooth::audio::V2_0::SampleRate;
+using ChannelMode_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::ChannelMode;
+using BitsPerSample_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::BitsPerSample;
+using CodecConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::CodecConfiguration;
+using CodecType_2_0 = ::android::hardware::bluetooth::audio::V2_0::CodecType;
+using SbcConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SbcParameters;
+using AacConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::AacParameters;
+using LdacConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::LdacParameters;
+using AptxConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::AptxParameters;
+using SbcAllocMethod_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SbcAllocMethod;
+using SbcBlockLength_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SbcBlockLength;
+using SbcChannelMode_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SbcChannelMode;
+using SbcNumSubbands_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SbcNumSubbands;
+using AacObjectType_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::AacObjectType;
+using AacVarBitRate_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::AacVariableBitRate;
+using LdacChannelMode_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::LdacChannelMode;
+using LdacQualityIndex_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::LdacQualityIndex;
+
+using PcmConfig_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::PcmParameters;
+using SampleRate_2_1 = ::android::hardware::bluetooth::audio::V2_1::SampleRate;
+using Lc3CodecConfig_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::Lc3CodecConfiguration;
+using Lc3Config_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::Lc3Parameters;
+using Lc3FrameDuration_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::Lc3FrameDuration;
+
+std::mutex legacy_callback_lock;
+std::unordered_map<
+    SessionType,
+    std::unordered_map<uint16_t, std::shared_ptr<PortStatusCallbacks_2_0>>>
+    legacy_callback_table;
+
+const static std::unordered_map<SessionType_2_1, SessionType>
+    session_type_2_1_to_aidl_map{
+        {SessionType_2_1::A2DP_SOFTWARE_ENCODING_DATAPATH,
+         SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH},
+        {SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH,
+         SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH},
+        {SessionType_2_1::HEARING_AID_SOFTWARE_ENCODING_DATAPATH,
+         SessionType::HEARING_AID_SOFTWARE_ENCODING_DATAPATH},
+        {SessionType_2_1::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH,
+         SessionType::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH},
+        {SessionType_2_1::LE_AUDIO_SOFTWARE_DECODED_DATAPATH,
+         SessionType::LE_AUDIO_SOFTWARE_DECODING_DATAPATH},
+        {SessionType_2_1::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH,
+         SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH},
+        {SessionType_2_1::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH,
+         SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH},
+    };
+
+const static std::unordered_map<int32_t, SampleRate_2_1>
+    sample_rate_to_hidl_2_1_map{
+        {44100, SampleRate_2_1::RATE_44100},
+        {48000, SampleRate_2_1::RATE_48000},
+        {88200, SampleRate_2_1::RATE_88200},
+        {96000, SampleRate_2_1::RATE_96000},
+        {176400, SampleRate_2_1::RATE_176400},
+        {192000, SampleRate_2_1::RATE_192000},
+        {16000, SampleRate_2_1::RATE_16000},
+        {24000, SampleRate_2_1::RATE_24000},
+        {8000, SampleRate_2_1::RATE_8000},
+        {32000, SampleRate_2_1::RATE_32000},
+    };
+
+const static std::unordered_map<CodecType, CodecType_2_0>
+    codec_type_to_hidl_2_0_map{
+        {CodecType::UNKNOWN, CodecType_2_0::UNKNOWN},
+        {CodecType::SBC, CodecType_2_0::SBC},
+        {CodecType::AAC, CodecType_2_0::AAC},
+        {CodecType::APTX, CodecType_2_0::APTX},
+        {CodecType::APTX_HD, CodecType_2_0::APTX_HD},
+        {CodecType::LDAC, CodecType_2_0::LDAC},
+        {CodecType::LC3, CodecType_2_0::UNKNOWN},
+    };
+
+const static std::unordered_map<SbcChannelMode, SbcChannelMode_2_0>
+    sbc_channel_mode_to_hidl_2_0_map{
+        {SbcChannelMode::UNKNOWN, SbcChannelMode_2_0::UNKNOWN},
+        {SbcChannelMode::JOINT_STEREO, SbcChannelMode_2_0::JOINT_STEREO},
+        {SbcChannelMode::STEREO, SbcChannelMode_2_0::STEREO},
+        {SbcChannelMode::DUAL, SbcChannelMode_2_0::DUAL},
+        {SbcChannelMode::MONO, SbcChannelMode_2_0::MONO},
+    };
+
+const static std::unordered_map<int8_t, SbcBlockLength_2_0>
+    sbc_block_length_to_hidl_map{
+        {4, SbcBlockLength_2_0::BLOCKS_4},
+        {8, SbcBlockLength_2_0::BLOCKS_8},
+        {12, SbcBlockLength_2_0::BLOCKS_12},
+        {16, SbcBlockLength_2_0::BLOCKS_16},
+    };
+
+const static std::unordered_map<int8_t, SbcNumSubbands_2_0>
+    sbc_subbands_to_hidl_map{
+        {4, SbcNumSubbands_2_0::SUBBAND_4},
+        {8, SbcNumSubbands_2_0::SUBBAND_8},
+    };
+
+const static std::unordered_map<SbcAllocMethod, SbcAllocMethod_2_0>
+    sbc_alloc_method_to_hidl_map{
+        {SbcAllocMethod::ALLOC_MD_S, SbcAllocMethod_2_0::ALLOC_MD_S},
+        {SbcAllocMethod::ALLOC_MD_L, SbcAllocMethod_2_0::ALLOC_MD_L},
+    };
+
+const static std::unordered_map<AacObjectType, AacObjectType_2_0>
+    aac_object_type_to_hidl_map{
+        {AacObjectType::MPEG2_LC, AacObjectType_2_0::MPEG2_LC},
+        {AacObjectType::MPEG4_LC, AacObjectType_2_0::MPEG4_LC},
+        {AacObjectType::MPEG4_LTP, AacObjectType_2_0::MPEG4_LTP},
+        {AacObjectType::MPEG4_SCALABLE, AacObjectType_2_0::MPEG4_SCALABLE},
+    };
+
+const static std::unordered_map<LdacChannelMode, LdacChannelMode_2_0>
+    ldac_channel_mode_to_hidl_map{
+        {LdacChannelMode::UNKNOWN, LdacChannelMode_2_0::UNKNOWN},
+        {LdacChannelMode::STEREO, LdacChannelMode_2_0::STEREO},
+        {LdacChannelMode::DUAL, LdacChannelMode_2_0::DUAL},
+        {LdacChannelMode::MONO, LdacChannelMode_2_0::MONO},
+    };
+
+const static std::unordered_map<LdacQualityIndex, LdacQualityIndex_2_0>
+    ldac_qindex_to_hidl_map{
+        {LdacQualityIndex::HIGH, LdacQualityIndex_2_0::QUALITY_HIGH},
+        {LdacQualityIndex::MID, LdacQualityIndex_2_0::QUALITY_MID},
+        {LdacQualityIndex::LOW, LdacQualityIndex_2_0::QUALITY_LOW},
+        {LdacQualityIndex::ABR, LdacQualityIndex_2_0::QUALITY_ABR},
+    };
+
+inline SessionType from_session_type_2_1(
+    const SessionType_2_1& session_type_hidl) {
+  auto it = session_type_2_1_to_aidl_map.find(session_type_hidl);
+  if (it != session_type_2_1_to_aidl_map.end()) return it->second;
+  return SessionType::UNKNOWN;
+}
+
+inline SessionType from_session_type_2_0(
+    const SessionType_2_0& session_type_hidl) {
+  return from_session_type_2_1(static_cast<SessionType_2_1>(session_type_hidl));
+}
+
+inline HidlStatus to_hidl_status(const BluetoothAudioStatus& status) {
+  switch (status) {
+    case BluetoothAudioStatus::SUCCESS:
+      return HidlStatus::SUCCESS;
+    case BluetoothAudioStatus::UNSUPPORTED_CODEC_CONFIGURATION:
+      return HidlStatus::UNSUPPORTED_CODEC_CONFIGURATION;
+    default:
+      return HidlStatus::FAILURE;
+  }
+}
+
+inline SampleRate_2_1 to_hidl_sample_rate_2_1(const int32_t sample_rate_hz) {
+  auto it = sample_rate_to_hidl_2_1_map.find(sample_rate_hz);
+  if (it != sample_rate_to_hidl_2_1_map.end()) return it->second;
+  return SampleRate_2_1::RATE_UNKNOWN;
+}
+
+inline SampleRate_2_0 to_hidl_sample_rate_2_0(const int32_t sample_rate_hz) {
+  auto it = sample_rate_to_hidl_2_1_map.find(sample_rate_hz);
+  if (it != sample_rate_to_hidl_2_1_map.end())
+    return static_cast<SampleRate_2_0>(it->second);
+  return SampleRate_2_0::RATE_UNKNOWN;
+}
+
+inline BitsPerSample_2_0 to_hidl_bits_per_sample(const int8_t bit_per_sample) {
+  switch (bit_per_sample) {
+    case 16:
+      return BitsPerSample_2_0::BITS_16;
+    case 24:
+      return BitsPerSample_2_0::BITS_24;
+    case 32:
+      return BitsPerSample_2_0::BITS_32;
+    default:
+      return BitsPerSample_2_0::BITS_UNKNOWN;
+  }
+}
+
+inline ChannelMode_2_0 to_hidl_channel_mode(const ChannelMode channel_mode) {
+  switch (channel_mode) {
+    case ChannelMode::MONO:
+      return ChannelMode_2_0::MONO;
+    case ChannelMode::STEREO:
+      return ChannelMode_2_0::STEREO;
+    default:
+      return ChannelMode_2_0::UNKNOWN;
+  }
+}
+
+inline PcmConfig_2_0 to_hidl_pcm_config_2_0(
+    const PcmConfiguration& pcm_config) {
+  PcmConfig_2_0 hidl_pcm_config;
+  hidl_pcm_config.sampleRate = to_hidl_sample_rate_2_0(pcm_config.sampleRateHz);
+  hidl_pcm_config.channelMode = to_hidl_channel_mode(pcm_config.channelMode);
+  hidl_pcm_config.bitsPerSample =
+      to_hidl_bits_per_sample(pcm_config.bitsPerSample);
+  return hidl_pcm_config;
+}
+
+inline CodecType_2_0 to_hidl_codec_type_2_0(const CodecType codec_type) {
+  auto it = codec_type_to_hidl_2_0_map.find(codec_type);
+  if (it != codec_type_to_hidl_2_0_map.end()) return it->second;
+  return CodecType_2_0::UNKNOWN;
+}
+
+inline SbcConfig_2_0 to_hidl_sbc_config(const SbcConfiguration sbc_config) {
+  SbcConfig_2_0 hidl_sbc_config;
+  hidl_sbc_config.minBitpool = sbc_config.minBitpool;
+  hidl_sbc_config.maxBitpool = sbc_config.maxBitpool;
+  hidl_sbc_config.sampleRate = to_hidl_sample_rate_2_0(sbc_config.sampleRateHz);
+  hidl_sbc_config.bitsPerSample =
+      to_hidl_bits_per_sample(sbc_config.bitsPerSample);
+  if (sbc_channel_mode_to_hidl_2_0_map.find(sbc_config.channelMode) !=
+      sbc_channel_mode_to_hidl_2_0_map.end()) {
+    hidl_sbc_config.channelMode =
+        sbc_channel_mode_to_hidl_2_0_map.at(sbc_config.channelMode);
+  }
+  if (sbc_block_length_to_hidl_map.find(sbc_config.blockLength) !=
+      sbc_block_length_to_hidl_map.end()) {
+    hidl_sbc_config.blockLength =
+        sbc_block_length_to_hidl_map.at(sbc_config.blockLength);
+  }
+  if (sbc_subbands_to_hidl_map.find(sbc_config.numSubbands) !=
+      sbc_subbands_to_hidl_map.end()) {
+    hidl_sbc_config.numSubbands =
+        sbc_subbands_to_hidl_map.at(sbc_config.numSubbands);
+  }
+  if (sbc_alloc_method_to_hidl_map.find(sbc_config.allocMethod) !=
+      sbc_alloc_method_to_hidl_map.end()) {
+    hidl_sbc_config.allocMethod =
+        sbc_alloc_method_to_hidl_map.at(sbc_config.allocMethod);
+  }
+  return hidl_sbc_config;
+}
+
+inline AacConfig_2_0 to_hidl_aac_config(const AacConfiguration aac_config) {
+  AacConfig_2_0 hidl_aac_config;
+  hidl_aac_config.sampleRate = to_hidl_sample_rate_2_0(aac_config.sampleRateHz);
+  hidl_aac_config.bitsPerSample =
+      to_hidl_bits_per_sample(aac_config.bitsPerSample);
+  hidl_aac_config.channelMode = to_hidl_channel_mode(aac_config.channelMode);
+  if (aac_object_type_to_hidl_map.find(aac_config.objectType) !=
+      aac_object_type_to_hidl_map.end()) {
+    hidl_aac_config.objectType =
+        aac_object_type_to_hidl_map.at(aac_config.objectType);
+  }
+  hidl_aac_config.variableBitRateEnabled = aac_config.variableBitRateEnabled
+                                               ? AacVarBitRate_2_0::ENABLED
+                                               : AacVarBitRate_2_0::DISABLED;
+  return hidl_aac_config;
+}
+
+inline LdacConfig_2_0 to_hidl_ldac_config(const LdacConfiguration ldac_config) {
+  LdacConfig_2_0 hidl_ldac_config;
+  hidl_ldac_config.sampleRate =
+      to_hidl_sample_rate_2_0(ldac_config.sampleRateHz);
+  hidl_ldac_config.bitsPerSample =
+      to_hidl_bits_per_sample(ldac_config.bitsPerSample);
+  if (ldac_channel_mode_to_hidl_map.find(ldac_config.channelMode) !=
+      ldac_channel_mode_to_hidl_map.end()) {
+    hidl_ldac_config.channelMode =
+        ldac_channel_mode_to_hidl_map.at(ldac_config.channelMode);
+  }
+  if (ldac_qindex_to_hidl_map.find(ldac_config.qualityIndex) !=
+      ldac_qindex_to_hidl_map.end()) {
+    hidl_ldac_config.qualityIndex =
+        ldac_qindex_to_hidl_map.at(ldac_config.qualityIndex);
+  }
+  return hidl_ldac_config;
+}
+
+inline AptxConfig_2_0 to_hidl_aptx_config(const AptxConfiguration aptx_config) {
+  AptxConfig_2_0 hidl_aptx_config;
+  hidl_aptx_config.sampleRate =
+      to_hidl_sample_rate_2_0(aptx_config.sampleRateHz);
+  hidl_aptx_config.bitsPerSample =
+      to_hidl_bits_per_sample(aptx_config.bitsPerSample);
+  hidl_aptx_config.channelMode = to_hidl_channel_mode(aptx_config.channelMode);
+  return hidl_aptx_config;
+}
+
+inline CodecConfig_2_0 to_hidl_codec_config_2_0(
+    const CodecConfiguration& codec_config) {
+  CodecConfig_2_0 hidl_codec_config;
+  hidl_codec_config.codecType = to_hidl_codec_type_2_0(codec_config.codecType);
+  hidl_codec_config.encodedAudioBitrate =
+      static_cast<uint32_t>(codec_config.encodedAudioBitrate);
+  hidl_codec_config.peerMtu = static_cast<uint32_t>(codec_config.peerMtu);
+  hidl_codec_config.isScmstEnabled = codec_config.isScmstEnabled;
+  switch (codec_config.config.getTag()) {
+    case CodecConfiguration::CodecSpecific::sbcConfig:
+      hidl_codec_config.config.sbcConfig(to_hidl_sbc_config(
+          codec_config.config
+              .get<CodecConfiguration::CodecSpecific::sbcConfig>()));
+      break;
+    case CodecConfiguration::CodecSpecific::aacConfig:
+      hidl_codec_config.config.aacConfig(to_hidl_aac_config(
+          codec_config.config
+              .get<CodecConfiguration::CodecSpecific::aacConfig>()));
+      break;
+    case CodecConfiguration::CodecSpecific::ldacConfig:
+      hidl_codec_config.config.ldacConfig(to_hidl_ldac_config(
+          codec_config.config
+              .get<CodecConfiguration::CodecSpecific::ldacConfig>()));
+      break;
+    case CodecConfiguration::CodecSpecific::aptxConfig:
+      hidl_codec_config.config.aptxConfig(to_hidl_aptx_config(
+          codec_config.config
+              .get<CodecConfiguration::CodecSpecific::aptxConfig>()));
+      break;
+    default:
+      break;
+  }
+  return hidl_codec_config;
+}
+
+inline AudioConfig_2_0 to_hidl_audio_config_2_0(
+    const AudioConfiguration& audio_config) {
+  AudioConfig_2_0 hidl_audio_config;
+  if (audio_config.getTag() == AudioConfiguration::pcmConfig) {
+    hidl_audio_config.pcmConfig(to_hidl_pcm_config_2_0(
+        audio_config.get<AudioConfiguration::pcmConfig>()));
+  } else if (audio_config.getTag() == AudioConfiguration::a2dpConfig) {
+    hidl_audio_config.codecConfig(to_hidl_codec_config_2_0(
+        audio_config.get<AudioConfiguration::a2dpConfig>()));
+  }
+  return hidl_audio_config;
+}
+
+inline PcmConfig_2_1 to_hidl_pcm_config_2_1(
+    const PcmConfiguration& pcm_config) {
+  PcmConfig_2_1 hidl_pcm_config;
+  hidl_pcm_config.sampleRate = to_hidl_sample_rate_2_1(pcm_config.sampleRateHz);
+  hidl_pcm_config.channelMode = to_hidl_channel_mode(pcm_config.channelMode);
+  hidl_pcm_config.bitsPerSample =
+      to_hidl_bits_per_sample(pcm_config.bitsPerSample);
+  hidl_pcm_config.dataIntervalUs =
+      static_cast<uint32_t>(pcm_config.dataIntervalUs);
+  return hidl_pcm_config;
+}
+
+inline Lc3Config_2_1 to_hidl_lc3_config_2_1(
+    const Lc3Configuration& lc3_config) {
+  Lc3Config_2_1 hidl_lc3_config;
+  hidl_lc3_config.pcmBitDepth = to_hidl_bits_per_sample(lc3_config.pcmBitDepth);
+  hidl_lc3_config.samplingFrequency =
+      to_hidl_sample_rate_2_1(lc3_config.samplingFrequencyHz);
+  if (lc3_config.samplingFrequencyHz == 10000)
+    hidl_lc3_config.frameDuration = Lc3FrameDuration_2_1::DURATION_10000US;
+  else if (lc3_config.samplingFrequencyHz == 7500)
+    hidl_lc3_config.frameDuration = Lc3FrameDuration_2_1::DURATION_7500US;
+  hidl_lc3_config.octetsPerFrame =
+      static_cast<uint32_t>(lc3_config.octetsPerFrame);
+  hidl_lc3_config.blocksPerSdu = static_cast<uint32_t>(lc3_config.blocksPerSdu);
+  return hidl_lc3_config;
+}
+
+inline Lc3CodecConfig_2_1 to_hidl_leaudio_config_2_1(
+    const LeAudioConfiguration& unicast_config) {
+  Lc3CodecConfig_2_1 hidl_lc3_codec_config = {
+      .audioChannelAllocation = 0,
+  };
+  if (unicast_config.leAudioCodecConfig.getTag() ==
+      LeAudioCodecConfiguration::lc3Config) {
+    LOG(FATAL) << __func__ << ": unexpected codec type(vendor?)";
+  }
+  auto& le_codec_config = unicast_config.leAudioCodecConfig
+                              .get<LeAudioCodecConfiguration::lc3Config>();
+
+  hidl_lc3_codec_config.lc3Config = to_hidl_lc3_config_2_1(le_codec_config);
+
+  for (const auto& map : unicast_config.streamMap) {
+    hidl_lc3_codec_config.audioChannelAllocation |= map.audioChannelAllocation;
+  }
+  return hidl_lc3_codec_config;
+}
+
+inline Lc3CodecConfig_2_1 to_hidl_leaudio_broadcast_config_2_1(
+    const LeAudioBroadcastConfiguration& broadcast_config) {
+  Lc3CodecConfig_2_1 hidl_lc3_codec_config = {
+      .audioChannelAllocation = 0,
+  };
+  // NOTE: Broadcast is not officially supported in HIDL
+  if (broadcast_config.streamMap.empty()) {
+    return hidl_lc3_codec_config;
+  }
+  if (broadcast_config.streamMap[0].leAudioCodecConfig.getTag() !=
+      LeAudioCodecConfiguration::lc3Config) {
+    LOG(FATAL) << __func__ << ": unexpected codec type(vendor?)";
+  }
+  auto& le_codec_config =
+      broadcast_config.streamMap[0]
+          .leAudioCodecConfig.get<LeAudioCodecConfiguration::lc3Config>();
+  hidl_lc3_codec_config.lc3Config = to_hidl_lc3_config_2_1(le_codec_config);
+
+  for (const auto& map : broadcast_config.streamMap) {
+    hidl_lc3_codec_config.audioChannelAllocation |= map.audioChannelAllocation;
+  }
+  return hidl_lc3_codec_config;
+}
+
+inline AudioConfig_2_1 to_hidl_audio_config_2_1(
+    const AudioConfiguration& audio_config) {
+  AudioConfig_2_1 hidl_audio_config;
+  switch (audio_config.getTag()) {
+    case AudioConfiguration::pcmConfig:
+      hidl_audio_config.pcmConfig(to_hidl_pcm_config_2_1(
+          audio_config.get<AudioConfiguration::pcmConfig>()));
+      break;
+    case AudioConfiguration::a2dpConfig:
+      hidl_audio_config.codecConfig(to_hidl_codec_config_2_0(
+          audio_config.get<AudioConfiguration::a2dpConfig>()));
+      break;
+    case AudioConfiguration::leAudioConfig:
+      hidl_audio_config.leAudioCodecConfig(to_hidl_leaudio_config_2_1(
+          audio_config.get<AudioConfiguration::leAudioConfig>()));
+      break;
+    case AudioConfiguration::leAudioBroadcastConfig:
+      hidl_audio_config.leAudioCodecConfig(to_hidl_leaudio_broadcast_config_2_1(
+          audio_config.get<AudioConfiguration::leAudioBroadcastConfig>()));
+      break;
+  }
+  return hidl_audio_config;
+}
+
+/***
+ *
+ * 2.0
+ *
+ ***/
+
+bool HidlToAidlMiddleware_2_0::IsSessionReady(
+    const SessionType_2_0& session_type) {
+  return BluetoothAudioSessionControl::IsSessionReady(
+      from_session_type_2_0(session_type));
+}
+
+uint16_t HidlToAidlMiddleware_2_0::RegisterControlResultCback(
+    const SessionType_2_0& session_type,
+    const PortStatusCallbacks_2_0& cbacks) {
+  LOG(INFO) << __func__ << ": " << toString(session_type);
+  auto aidl_session_type = from_session_type_2_0(session_type);
+  // Pass the exact reference to the lambda
+  auto& session_legacy_callback_table =
+      legacy_callback_table[aidl_session_type];
+  PortStatusCallbacks aidl_callbacks{};
+  if (cbacks.control_result_cb_) {
+    aidl_callbacks.control_result_cb_ =
+        [&session_legacy_callback_table](uint16_t cookie, bool start_resp,
+                                         const BluetoothAudioStatus& status) {
+          if (session_legacy_callback_table.find(cookie) ==
+              session_legacy_callback_table.end()) {
+            LOG(ERROR) << __func__ << ": Unknown callback invoked!";
+            return;
+          }
+          auto& cback = session_legacy_callback_table[cookie];
+          cback->control_result_cb_(cookie, start_resp, to_hidl_status(status));
+        };
+  }
+  if (cbacks.session_changed_cb_) {
+    aidl_callbacks.session_changed_cb_ =
+        [&session_legacy_callback_table](uint16_t cookie) {
+          if (session_legacy_callback_table.find(cookie) ==
+              session_legacy_callback_table.end()) {
+            LOG(ERROR) << __func__ << ": Unknown callback invoked!";
+            return;
+          }
+          auto& cback = session_legacy_callback_table[cookie];
+          cback->session_changed_cb_(cookie);
+        };
+  };
+  auto cookie = BluetoothAudioSessionControl::RegisterControlResultCback(
+      aidl_session_type, aidl_callbacks);
+  {
+    std::lock_guard<std::mutex> guard(legacy_callback_lock);
+    session_legacy_callback_table[cookie] =
+        std::make_shared<PortStatusCallbacks_2_0>(cbacks);
+  }
+  return cookie;
+}
+
+void HidlToAidlMiddleware_2_0::UnregisterControlResultCback(
+    const SessionType_2_0& session_type, uint16_t cookie) {
+  LOG(INFO) << __func__ << ": " << toString(session_type);
+  auto aidl_session_type = from_session_type_2_0(session_type);
+  BluetoothAudioSessionControl::UnregisterControlResultCback(aidl_session_type,
+                                                             cookie);
+  auto& session_callback_table = legacy_callback_table[aidl_session_type];
+  if (session_callback_table.find(cookie) != session_callback_table.end()) {
+    std::lock_guard<std::mutex> guard(legacy_callback_lock);
+    session_callback_table.erase(cookie);
+  }
+}
+
+const AudioConfig_2_0 HidlToAidlMiddleware_2_0::GetAudioConfig(
+    const SessionType_2_0& session_type) {
+  return to_hidl_audio_config_2_0(BluetoothAudioSessionControl::GetAudioConfig(
+      from_session_type_2_0(session_type)));
+}
+
+bool HidlToAidlMiddleware_2_0::StartStream(
+    const SessionType_2_0& session_type) {
+  return BluetoothAudioSessionControl::StartStream(
+      from_session_type_2_0(session_type));
+}
+
+void HidlToAidlMiddleware_2_0::StopStream(const SessionType_2_0& session_type) {
+  return BluetoothAudioSessionControl::StopStream(
+      from_session_type_2_0(session_type));
+}
+
+bool HidlToAidlMiddleware_2_0::SuspendStream(
+    const SessionType_2_0& session_type) {
+  return BluetoothAudioSessionControl::SuspendStream(
+      from_session_type_2_0(session_type));
+}
+
+bool HidlToAidlMiddleware_2_0::GetPresentationPosition(
+    const SessionType_2_0& session_type, uint64_t* remote_delay_report_ns,
+    uint64_t* total_bytes_readed, timespec* data_position) {
+  PresentationPosition presentation_position;
+  auto ret_val = BluetoothAudioSessionControl::GetPresentationPosition(
+      from_session_type_2_0(session_type), presentation_position);
+  if (remote_delay_report_ns)
+    *remote_delay_report_ns = presentation_position.remoteDeviceAudioDelayNanos;
+  if (total_bytes_readed)
+    *total_bytes_readed = presentation_position.transmittedOctets;
+  if (data_position)
+    *data_position = {
+        .tv_sec = static_cast<__kernel_old_time_t>(
+            presentation_position.transmittedOctetsTimestamp.tvSec),
+        .tv_nsec = static_cast<long>(
+            presentation_position.transmittedOctetsTimestamp.tvNSec)};
+  return ret_val;
+}
+
+void HidlToAidlMiddleware_2_0::UpdateTracksMetadata(
+    const SessionType_2_0& session_type,
+    const struct source_metadata* source_metadata) {
+  return BluetoothAudioSessionControl::UpdateSourceMetadata(
+      from_session_type_2_0(session_type), *source_metadata);
+}
+
+size_t HidlToAidlMiddleware_2_0::OutWritePcmData(
+    const SessionType_2_0& session_type, const void* buffer, size_t bytes) {
+  return BluetoothAudioSessionControl::OutWritePcmData(
+      from_session_type_2_0(session_type), buffer, bytes);
+}
+
+size_t HidlToAidlMiddleware_2_0::InReadPcmData(
+    const SessionType_2_0& session_type, void* buffer, size_t bytes) {
+  return BluetoothAudioSessionControl::InReadPcmData(
+      from_session_type_2_0(session_type), buffer, bytes);
+}
+
+bool HidlToAidlMiddleware_2_0::IsAidlAvailable() {
+  return BluetoothAudioSession::IsAidlAvailable();
+}
+
+/***
+ *
+ * 2.1
+ *
+ ***/
+
+const AudioConfig_2_1 HidlToAidlMiddleware_2_1::GetAudioConfig(
+    const SessionType_2_1& session_type) {
+  return to_hidl_audio_config_2_1(BluetoothAudioSessionControl::GetAudioConfig(
+      from_session_type_2_1(session_type)));
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware_2_0.h

@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android/hardware/bluetooth/audio/2.0/types.h>
+
+#include "../session/BluetoothAudioSession.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+using SessionType_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SessionType;
+using PortStatusCallbacks_2_0 =
+    ::android::bluetooth::audio::PortStatusCallbacks;
+using AudioConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::AudioConfiguration;
+
+class HidlToAidlMiddleware_2_0 {
+ public:
+  static bool IsAidlAvailable();
+
+  static bool IsSessionReady(const SessionType_2_0& session_type);
+
+  static uint16_t RegisterControlResultCback(
+      const SessionType_2_0& session_type,
+      const PortStatusCallbacks_2_0& cbacks);
+
+  static void UnregisterControlResultCback(const SessionType_2_0& session_type,
+                                           uint16_t cookie);
+
+  static const AudioConfig_2_0 GetAudioConfig(
+      const SessionType_2_0& session_type);
+
+  static bool StartStream(const SessionType_2_0& session_type);
+
+  static void StopStream(const SessionType_2_0& session_type);
+
+  static bool SuspendStream(const SessionType_2_0& session_type);
+
+  static bool GetPresentationPosition(const SessionType_2_0& session_type,
+                                      uint64_t* remote_delay_report_ns,
+                                      uint64_t* total_bytes_readed,
+                                      timespec* data_position);
+
+  static void UpdateTracksMetadata(
+      const SessionType_2_0& session_type,
+      const struct source_metadata* source_metadata);
+
+  static size_t OutWritePcmData(const SessionType_2_0& session_type,
+                                const void* buffer, size_t bytes);
+
+  static size_t InReadPcmData(const SessionType_2_0& session_type, void* buffer,
+                              size_t bytes);
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware_2_1.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android/hardware/bluetooth/audio/2.1/types.h>
+
+#include "../session/BluetoothAudioSession.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+using SessionType_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::SessionType;
+using AudioConfig_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration;
+
+class HidlToAidlMiddleware_2_1 {
+ public:
+  static const AudioConfig_2_1 GetAudioConfig(
+      const SessionType_2_1& session_type);
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl

bluetooth/audio/utils/session/BluetoothAudioSession.cpp

@@ -0,0 +1,498 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioProviderSession"
+
+#include "BluetoothAudioSession.h"
+
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+
+#include "../aidl_session/HidlToAidlMiddleware_2_0.h"
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+
+using ::aidl::android::hardware::bluetooth::audio::HidlToAidlMiddleware_2_0;
+using ::android::hardware::audio::common::V5_0::AudioContentType;
+using ::android::hardware::audio::common::V5_0::AudioUsage;
+using ::android::hardware::audio::common::V5_0::PlaybackTrackMetadata;
+using ::android::hardware::audio::common::V5_0::SourceMetadata;
+using ::android::hardware::bluetooth::audio::V2_0::CodecType;
+using ::android::hardware::bluetooth::audio::V2_0::TimeSpec;
+
+const CodecConfiguration BluetoothAudioSession::kInvalidCodecConfiguration = {
+    .codecType = CodecType::UNKNOWN,
+    .encodedAudioBitrate = 0x00000000,
+    .peerMtu = 0xffff,
+    .isScmstEnabled = false,
+    .config = {}};
+AudioConfiguration BluetoothAudioSession::invalidSoftwareAudioConfiguration =
+    {};
+AudioConfiguration BluetoothAudioSession::invalidOffloadAudioConfiguration = {};
+
+static constexpr int kFmqSendTimeoutMs = 1000;  // 1000 ms timeout for sending
+static constexpr int kFmqReceiveTimeoutMs =
+    1000;                                       // 1000 ms timeout for receiving
+static constexpr int kWritePollMs = 1;          // polled non-blocking interval
+static constexpr int kReadPollMs = 1;           // polled non-blocking interval
+
+static inline timespec timespec_convert_from_hal(const TimeSpec& TS) {
+  return {.tv_sec = static_cast<long>(TS.tvSec),
+          .tv_nsec = static_cast<long>(TS.tvNSec)};
+}
+
+BluetoothAudioSession::BluetoothAudioSession(const SessionType& session_type)
+    : session_type_(session_type), stack_iface_(nullptr), mDataMQ(nullptr) {
+  invalidSoftwareAudioConfiguration.pcmConfig(kInvalidPcmParameters);
+  invalidOffloadAudioConfiguration.codecConfig(kInvalidCodecConfiguration);
+}
+
+// The report function is used to report that the Bluetooth stack has started
+// this session without any failure, and will invoke session_changed_cb_ to
+// notify those registered bluetooth_audio outputs
+void BluetoothAudioSession::OnSessionStarted(
+    const sp<IBluetoothAudioPort> stack_iface, const DataMQ::Descriptor* dataMQ,
+    const AudioConfiguration& audio_config) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (stack_iface == nullptr) {
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_)
+               << ", IBluetoothAudioPort Invalid";
+  } else if (!UpdateAudioConfig(audio_config)) {
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_)
+               << ", AudioConfiguration=" << toString(audio_config)
+               << " Invalid";
+  } else if (!UpdateDataPath(dataMQ)) {
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_)
+               << " DataMQ Invalid";
+    audio_config_ =
+        (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_DATAPATH
+             ? kInvalidOffloadAudioConfiguration
+             : kInvalidSoftwareAudioConfiguration);
+  } else {
+    stack_iface_ = stack_iface;
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << ", AudioConfiguration=" << toString(audio_config);
+    ReportSessionStatus();
+  }
+}
+
+// The report function is used to report that the Bluetooth stack has ended the
+// session, and will invoke session_changed_cb_ to notify registered
+// bluetooth_audio outputs
+void BluetoothAudioSession::OnSessionEnded() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  bool toggled = IsSessionReady();
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_);
+  audio_config_ = (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_DATAPATH
+                       ? kInvalidOffloadAudioConfiguration
+                       : kInvalidSoftwareAudioConfiguration);
+  stack_iface_ = nullptr;
+  UpdateDataPath(nullptr);
+  if (toggled) {
+    ReportSessionStatus();
+  }
+}
+
+// invoking the registered session_changed_cb_
+void BluetoothAudioSession::ReportSessionStatus() {
+  // This is locked already by OnSessionStarted / OnSessionEnded
+  if (observers_.empty()) {
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << " has NO port state observer";
+    return;
+  }
+  for (auto& observer : observers_) {
+    uint16_t cookie = observer.first;
+    std::shared_ptr<struct PortStatusCallbacks> cb = observer.second;
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << " notify to bluetooth_audio=0x"
+              << android::base::StringPrintf("%04x", cookie);
+    cb->session_changed_cb_(cookie);
+  }
+}
+
+// The report function is used to report that the Bluetooth stack has notified
+// the result of startStream or suspendStream, and will invoke
+// control_result_cb_ to notify registered bluetooth_audio outputs
+void BluetoothAudioSession::ReportControlStatus(
+    bool start_resp, const BluetoothAudioStatus& status) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (observers_.empty()) {
+    LOG(WARNING) << __func__ << " - SessionType=" << toString(session_type_)
+                 << " has NO port state observer";
+    return;
+  }
+  for (auto& observer : observers_) {
+    uint16_t cookie = observer.first;
+    std::shared_ptr<struct PortStatusCallbacks> cb = observer.second;
+    LOG(INFO) << __func__ << " - status=" << toString(status)
+              << " for SessionType=" << toString(session_type_)
+              << ", bluetooth_audio=0x"
+              << android::base::StringPrintf("%04x", cookie)
+              << (start_resp ? " started" : " suspended");
+    cb->control_result_cb_(cookie, start_resp, status);
+  }
+}
+
+// The function helps to check if this session is ready or not
+// @return: true if the Bluetooth stack has started the specified session
+bool BluetoothAudioSession::IsSessionReady() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::IsSessionReady(session_type_);
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  bool dataMQ_valid =
+      (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_DATAPATH ||
+       (mDataMQ != nullptr && mDataMQ->isValid()));
+  return stack_iface_ != nullptr && dataMQ_valid;
+}
+
+bool BluetoothAudioSession::UpdateDataPath(const DataMQ::Descriptor* dataMQ) {
+  if (dataMQ == nullptr) {
+    // usecase of reset by nullptr
+    mDataMQ = nullptr;
+    return true;
+  }
+  std::unique_ptr<DataMQ> tempDataMQ;
+  tempDataMQ.reset(new DataMQ(*dataMQ));
+  if (!tempDataMQ || !tempDataMQ->isValid()) {
+    mDataMQ = nullptr;
+    return false;
+  }
+  mDataMQ = std::move(tempDataMQ);
+  return true;
+}
+
+bool BluetoothAudioSession::UpdateAudioConfig(
+    const AudioConfiguration& audio_config) {
+  bool is_software_session =
+      (session_type_ == SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+       session_type_ == SessionType::HEARING_AID_SOFTWARE_ENCODING_DATAPATH);
+  bool is_offload_session =
+      (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_DATAPATH);
+  auto audio_config_discriminator = audio_config.getDiscriminator();
+  bool is_software_audio_config =
+      (is_software_session &&
+       audio_config_discriminator ==
+           AudioConfiguration::hidl_discriminator::pcmConfig);
+  bool is_offload_audio_config =
+      (is_offload_session &&
+       audio_config_discriminator ==
+           AudioConfiguration::hidl_discriminator::codecConfig);
+  if (!is_software_audio_config && !is_offload_audio_config) {
+    return false;
+  }
+  audio_config_ = audio_config;
+  return true;
+}
+
+// The control function helps the bluetooth_audio module to register
+// PortStatusCallbacks
+// @return: cookie - the assigned number to this bluetooth_audio output
+uint16_t BluetoothAudioSession::RegisterStatusCback(
+    const PortStatusCallbacks& cbacks) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::RegisterControlResultCback(session_type_,
+                                                                cbacks);
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  uint16_t cookie = ObserversCookieGetInitValue(session_type_);
+  uint16_t cookie_upper_bound = ObserversCookieGetUpperBound(session_type_);
+
+  while (cookie < cookie_upper_bound) {
+    if (observers_.find(cookie) == observers_.end()) {
+      break;
+    }
+    ++cookie;
+  }
+  if (cookie >= cookie_upper_bound) {
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has " << observers_.size()
+               << " observers already (No Resource)";
+    return kObserversCookieUndefined;
+  }
+  std::shared_ptr<struct PortStatusCallbacks> cb =
+      std::make_shared<struct PortStatusCallbacks>();
+  *cb = cbacks;
+  observers_[cookie] = cb;
+  return cookie;
+}
+
+// The control function helps the bluetooth_audio module to unregister
+// PortStatusCallbacks
+// @param: cookie - indicates which bluetooth_audio output is
+void BluetoothAudioSession::UnregisterStatusCback(uint16_t cookie) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::UnregisterControlResultCback(session_type_,
+                                                                  cookie);
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (observers_.erase(cookie) != 1) {
+    LOG(WARNING) << __func__ << " - SessionType=" << toString(session_type_)
+                 << " no such provider=0x"
+                 << android::base::StringPrintf("%04x", cookie);
+  }
+}
+
+// The control function is for the bluetooth_audio module to get the current
+// AudioConfiguration
+const AudioConfiguration& BluetoothAudioSession::GetAudioConfig() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return (audio_config_ =
+                HidlToAidlMiddleware_2_0::GetAudioConfig(session_type_));
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (IsSessionReady()) {
+    return audio_config_;
+  } else if (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_DATAPATH) {
+    return kInvalidOffloadAudioConfiguration;
+  } else {
+    return kInvalidSoftwareAudioConfiguration;
+  }
+}
+
+// Those control functions are for the bluetooth_audio module to start, suspend,
+// stop stream, to check position, and to update metadata.
+bool BluetoothAudioSession::StartStream() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::StartStream(session_type_);
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return false;
+  }
+  auto hal_retval = stack_iface_->startStream();
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+    return false;
+  }
+  return true;
+}
+
+bool BluetoothAudioSession::SuspendStream() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::SuspendStream(session_type_);
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return false;
+  }
+  auto hal_retval = stack_iface_->suspendStream();
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+    return false;
+  }
+  return true;
+}
+
+void BluetoothAudioSession::StopStream() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::StopStream(session_type_);
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    return;
+  }
+  auto hal_retval = stack_iface_->stopStream();
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+  }
+}
+
+bool BluetoothAudioSession::GetPresentationPosition(
+    uint64_t* remote_delay_report_ns, uint64_t* total_bytes_readed,
+    timespec* data_position) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::GetPresentationPosition(
+        session_type_, remote_delay_report_ns, total_bytes_readed,
+        data_position);
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return false;
+  }
+  bool retval = false;
+  auto hal_retval = stack_iface_->getPresentationPosition(
+      [&retval, &remote_delay_report_ns, &total_bytes_readed, &data_position](
+          BluetoothAudioStatus status,
+          const uint64_t& remoteDeviceAudioDelayNanos,
+          uint64_t transmittedOctets,
+          const TimeSpec& transmittedOctetsTimeStamp) {
+        if (status == BluetoothAudioStatus::SUCCESS) {
+          if (remote_delay_report_ns)
+            *remote_delay_report_ns = remoteDeviceAudioDelayNanos;
+          if (total_bytes_readed) *total_bytes_readed = transmittedOctets;
+          if (data_position)
+            *data_position =
+                timespec_convert_from_hal(transmittedOctetsTimeStamp);
+          retval = true;
+        }
+      });
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+    return false;
+  }
+  return retval;
+}
+
+void BluetoothAudioSession::UpdateTracksMetadata(
+    const struct source_metadata* source_metadata) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::UpdateTracksMetadata(session_type_,
+                                                          source_metadata);
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return;
+  }
+
+  ssize_t track_count = source_metadata->track_count;
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_) << ", "
+            << track_count << " track(s)";
+  if (session_type_ == SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+      session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_DATAPATH) {
+    return;
+  }
+
+  struct playback_track_metadata* track = source_metadata->tracks;
+  SourceMetadata sourceMetadata;
+  PlaybackTrackMetadata* halMetadata;
+
+  sourceMetadata.tracks.resize(track_count);
+  halMetadata = sourceMetadata.tracks.data();
+  while (track_count && track) {
+    halMetadata->usage = static_cast<AudioUsage>(track->usage);
+    halMetadata->contentType =
+        static_cast<AudioContentType>(track->content_type);
+    halMetadata->gain = track->gain;
+    LOG(VERBOSE) << __func__ << " - SessionType=" << toString(session_type_)
+                 << ", usage=" << toString(halMetadata->usage)
+                 << ", content=" << toString(halMetadata->contentType)
+                 << ", gain=" << halMetadata->gain;
+    --track_count;
+    ++track;
+    ++halMetadata;
+  }
+  auto hal_retval = stack_iface_->updateMetadata(sourceMetadata);
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+  }
+}
+
+// The control function writes stream to FMQ
+size_t BluetoothAudioSession::OutWritePcmData(const void* buffer,
+                                              size_t bytes) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::OutWritePcmData(session_type_, buffer,
+                                                     bytes);
+  if (buffer == nullptr || !bytes) return 0;
+  size_t totalWritten = 0;
+  int ms_timeout = kFmqSendTimeoutMs;
+  do {
+    std::unique_lock<std::recursive_mutex> lock(mutex_);
+    if (!IsSessionReady()) break;
+    size_t availableToWrite = mDataMQ->availableToWrite();
+    if (availableToWrite) {
+      if (availableToWrite > (bytes - totalWritten)) {
+        availableToWrite = bytes - totalWritten;
+      }
+
+      if (!mDataMQ->write(static_cast<const uint8_t*>(buffer) + totalWritten,
+                          availableToWrite)) {
+        ALOGE("FMQ datapath writting %zu/%zu failed", totalWritten, bytes);
+        return totalWritten;
+      }
+      totalWritten += availableToWrite;
+    } else if (ms_timeout >= kWritePollMs) {
+      lock.unlock();
+      usleep(kWritePollMs * 1000);
+      ms_timeout -= kWritePollMs;
+    } else {
+      ALOGD("data %zu/%zu overflow %d ms", totalWritten, bytes,
+            (kFmqSendTimeoutMs - ms_timeout));
+      return totalWritten;
+    }
+  } while (totalWritten < bytes);
+  return totalWritten;
+}
+
+// The control function reads stream from FMQ
+size_t BluetoothAudioSession::InReadPcmData(void* buffer, size_t bytes) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::InReadPcmData(session_type_, buffer,
+                                                   bytes);
+  if (buffer == nullptr || !bytes) return 0;
+  size_t totalRead = 0;
+  int ms_timeout = kFmqReceiveTimeoutMs;
+  do {
+    std::unique_lock<std::recursive_mutex> lock(mutex_);
+    if (!IsSessionReady()) break;
+    size_t availableToRead = mDataMQ->availableToRead();
+    if (availableToRead) {
+      if (availableToRead > (bytes - totalRead)) {
+        availableToRead = bytes - totalRead;
+      }
+      if (!mDataMQ->read(static_cast<uint8_t*>(buffer) + totalRead,
+                         availableToRead)) {
+        ALOGE("FMQ datapath reading %zu/%zu failed", totalRead, bytes);
+        return totalRead;
+      }
+      totalRead += availableToRead;
+    } else if (ms_timeout >= kReadPollMs) {
+      lock.unlock();
+      usleep(kReadPollMs * 1000);
+      ms_timeout -= kReadPollMs;
+      continue;
+    } else {
+      ALOGD("in data %zu/%zu overflow %d ms", totalRead, bytes,
+            (kFmqReceiveTimeoutMs - ms_timeout));
+      return totalRead;
+    }
+  } while (totalRead < bytes);
+  return totalRead;
+}
+
+std::unique_ptr<BluetoothAudioSessionInstance>
+    BluetoothAudioSessionInstance::instance_ptr =
+        std::unique_ptr<BluetoothAudioSessionInstance>(
+            new BluetoothAudioSessionInstance());
+
+// API to fetch the session of A2DP / Hearing Aid
+std::shared_ptr<BluetoothAudioSession>
+BluetoothAudioSessionInstance::GetSessionInstance(
+    const SessionType& session_type) {
+  std::lock_guard<std::mutex> guard(instance_ptr->mutex_);
+  if (!instance_ptr->sessions_map_.empty()) {
+    auto entry = instance_ptr->sessions_map_.find(session_type);
+    if (entry != instance_ptr->sessions_map_.end()) {
+      return entry->second;
+    }
+  }
+  std::shared_ptr<BluetoothAudioSession> session_ptr =
+      std::make_shared<BluetoothAudioSession>(session_type);
+  instance_ptr->sessions_map_[session_type] = session_ptr;
+  return session_ptr;
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/utils/session/BluetoothAudioSession.h

@@ -0,0 +1,191 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <mutex>
+#include <unordered_map>
+
+#include <android/hardware/bluetooth/audio/2.0/IBluetoothAudioPort.h>
+#include <fmq/MessageQueue.h>
+#include <hardware/audio.h>
+#include <hidl/MQDescriptor.h>
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+
+using ::android::sp;
+using ::android::hardware::kSynchronizedReadWrite;
+using ::android::hardware::MessageQueue;
+using ::android::hardware::bluetooth::audio::V2_0::AudioConfiguration;
+using ::android::hardware::bluetooth::audio::V2_0::BitsPerSample;
+using ::android::hardware::bluetooth::audio::V2_0::ChannelMode;
+using ::android::hardware::bluetooth::audio::V2_0::CodecConfiguration;
+using ::android::hardware::bluetooth::audio::V2_0::IBluetoothAudioPort;
+using ::android::hardware::bluetooth::audio::V2_0::PcmParameters;
+using ::android::hardware::bluetooth::audio::V2_0::SampleRate;
+using ::android::hardware::bluetooth::audio::V2_0::SessionType;
+
+using BluetoothAudioStatus =
+    ::android::hardware::bluetooth::audio::V2_0::Status;
+
+using DataMQ = MessageQueue<uint8_t, kSynchronizedReadWrite>;
+
+static constexpr uint16_t kObserversCookieSize = 0x0010;  // 0x0000 ~ 0x000f
+constexpr uint16_t kObserversCookieUndefined =
+    (static_cast<uint16_t>(SessionType::UNKNOWN) << 8 & 0xff00);
+inline SessionType ObserversCookieGetSessionType(uint16_t cookie) {
+  return static_cast<SessionType>(cookie >> 8 & 0x00ff);
+}
+inline uint16_t ObserversCookieGetInitValue(SessionType session_type) {
+  return (static_cast<uint16_t>(session_type) << 8 & 0xff00);
+}
+inline uint16_t ObserversCookieGetUpperBound(SessionType session_type) {
+  return (static_cast<uint16_t>(session_type) << 8 & 0xff00) +
+         kObserversCookieSize;
+}
+
+// This presents the callbacks of started / suspended and session changed,
+// and the bluetooth_audio module uses to receive the status notification
+struct PortStatusCallbacks {
+  // control_result_cb_ - when the Bluetooth stack reports results of
+  // streamStarted or streamSuspended, the BluetoothAudioProvider will invoke
+  // this callback to report to the bluetooth_audio module.
+  // @param: cookie - indicates which bluetooth_audio output should handle
+  // @param: start_resp - this report is for startStream or not
+  // @param: status - the result of startStream
+  std::function<void(uint16_t cookie, bool start_resp,
+                     const BluetoothAudioStatus& status)>
+      control_result_cb_;
+  // session_changed_cb_ - when the Bluetooth stack start / end session, the
+  // BluetoothAudioProvider will invoke this callback to notify to the
+  // bluetooth_audio module.
+  // @param: cookie - indicates which bluetooth_audio output should handle
+  std::function<void(uint16_t cookie)> session_changed_cb_;
+};
+
+class BluetoothAudioSession {
+  friend class BluetoothAudioSession_2_1;
+  friend class BluetoothAudioSession_2_2;
+
+ private:
+  // using recursive_mutex to allow hwbinder to re-enter agian.
+  std::recursive_mutex mutex_;
+  SessionType session_type_;
+
+  // audio control path to use for both software and offloading
+  sp<IBluetoothAudioPort> stack_iface_;
+  // audio data path (FMQ) for software encoding
+  std::unique_ptr<DataMQ> mDataMQ;
+  // audio data configuration for both software and offloading
+  AudioConfiguration audio_config_;
+
+  static AudioConfiguration invalidSoftwareAudioConfiguration;
+  static AudioConfiguration invalidOffloadAudioConfiguration;
+
+  // saving those registered bluetooth_audio's callbacks
+  std::unordered_map<uint16_t, std::shared_ptr<struct PortStatusCallbacks>>
+      observers_;
+
+  bool UpdateDataPath(const DataMQ::Descriptor* dataMQ);
+  bool UpdateAudioConfig(const AudioConfiguration& audio_config);
+  // invoking the registered session_changed_cb_
+  void ReportSessionStatus();
+
+ public:
+  BluetoothAudioSession(const SessionType& session_type);
+
+  // The function helps to check if this session is ready or not
+  // @return: true if the Bluetooth stack has started the specified session
+  bool IsSessionReady();
+
+  // The report function is used to report that the Bluetooth stack has started
+  // this session without any failure, and will invoke session_changed_cb_ to
+  // notify those registered bluetooth_audio outputs
+  void OnSessionStarted(const sp<IBluetoothAudioPort> stack_iface,
+                        const DataMQ::Descriptor* dataMQ,
+                        const AudioConfiguration& audio_config);
+
+  // The report function is used to report that the Bluetooth stack has ended
+  // the session, and will invoke session_changed_cb_ to notify registered
+  // bluetooth_audio outputs
+  void OnSessionEnded();
+
+  // The report function is used to report that the Bluetooth stack has notified
+  // the result of startStream or suspendStream, and will invoke
+  // control_result_cb_ to notify registered bluetooth_audio outputs
+  void ReportControlStatus(bool start_resp, const BluetoothAudioStatus& status);
+
+  // The control function helps the bluetooth_audio module to register
+  // PortStatusCallbacks
+  // @return: cookie - the assigned number to this bluetooth_audio output
+  uint16_t RegisterStatusCback(const PortStatusCallbacks& cbacks);
+
+  // The control function helps the bluetooth_audio module to unregister
+  // PortStatusCallbacks
+  // @param: cookie - indicates which bluetooth_audio output is
+  void UnregisterStatusCback(uint16_t cookie);
+
+  // The control function is for the bluetooth_audio module to get the current
+  // AudioConfiguration
+  const AudioConfiguration& GetAudioConfig();
+
+  // Those control functions are for the bluetooth_audio module to start,
+  // suspend, stop stream, to check position, and to update metadata.
+  bool StartStream();
+  bool SuspendStream();
+  void StopStream();
+  bool GetPresentationPosition(uint64_t* remote_delay_report_ns,
+                               uint64_t* total_bytes_readed,
+                               timespec* data_position);
+  void UpdateTracksMetadata(const struct source_metadata* source_metadata);
+
+  // The control function writes stream to FMQ
+  size_t OutWritePcmData(const void* buffer, size_t bytes);
+  // The control function read stream from FMQ
+  size_t InReadPcmData(void* buffer, size_t bytes);
+
+  static constexpr PcmParameters kInvalidPcmParameters = {
+      .sampleRate = SampleRate::RATE_UNKNOWN,
+      .channelMode = ChannelMode::UNKNOWN,
+      .bitsPerSample = BitsPerSample::BITS_UNKNOWN,
+  };
+  // can't be constexpr because of non-literal type
+  static const CodecConfiguration kInvalidCodecConfiguration;
+
+  static constexpr AudioConfiguration& kInvalidSoftwareAudioConfiguration =
+      invalidSoftwareAudioConfiguration;
+  static constexpr AudioConfiguration& kInvalidOffloadAudioConfiguration =
+      invalidOffloadAudioConfiguration;
+};
+
+class BluetoothAudioSessionInstance {
+ public:
+  // The API is to fetch the specified session of A2DP / Hearing Aid
+  static std::shared_ptr<BluetoothAudioSession> GetSessionInstance(
+      const SessionType& session_type);
+
+ private:
+  static std::unique_ptr<BluetoothAudioSessionInstance> instance_ptr;
+  std::mutex mutex_;
+  std::unordered_map<SessionType, std::shared_ptr<BluetoothAudioSession>>
+      sessions_map_;
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/utils/session/BluetoothAudioSessionControl.h

@@ -0,0 +1,143 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioSession.h"
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioSessionControl {
+ public:
+  // The control API helps to check if session is ready or not
+  // @return: true if the Bluetooth stack has started th specified session
+  static bool IsSessionReady(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->IsSessionReady();
+    }
+    return false;
+  }
+
+  // The control API helps the bluetooth_audio module to register
+  // PortStatusCallbacks
+  // @return: cookie - the assigned number to this bluetooth_audio output
+  static uint16_t RegisterControlResultCback(
+      const SessionType& session_type, const PortStatusCallbacks& cbacks) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->RegisterStatusCback(cbacks);
+    }
+    return kObserversCookieUndefined;
+  }
+
+  // The control API helps the bluetooth_audio module to unregister
+  // PortStatusCallbacks
+  // @param: cookie - indicates which bluetooth_audio output is
+  static void UnregisterControlResultCback(const SessionType& session_type,
+                                           uint16_t cookie) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->UnregisterStatusCback(cookie);
+    }
+  }
+
+  // The control API for the bluetooth_audio module to get current
+  // AudioConfiguration
+  static const AudioConfiguration& GetAudioConfig(
+      const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetAudioConfig();
+    } else if (session_type == SessionType::A2DP_HARDWARE_OFFLOAD_DATAPATH) {
+      return BluetoothAudioSession::kInvalidOffloadAudioConfiguration;
+    } else {
+      return BluetoothAudioSession::kInvalidSoftwareAudioConfiguration;
+    }
+  }
+
+  // Those control APIs for the bluetooth_audio module to start / suspend / stop
+  // stream, to check position, and to update metadata.
+  static bool StartStream(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->StartStream();
+    }
+    return false;
+  }
+
+  static bool SuspendStream(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->SuspendStream();
+    }
+    return false;
+  }
+
+  static void StopStream(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->StopStream();
+    }
+  }
+
+  static bool GetPresentationPosition(const SessionType& session_type,
+                                      uint64_t* remote_delay_report_ns,
+                                      uint64_t* total_bytes_readed,
+                                      timespec* data_position) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetPresentationPosition(
+          remote_delay_report_ns, total_bytes_readed, data_position);
+    }
+    return false;
+  }
+
+  static void UpdateTracksMetadata(
+      const SessionType& session_type,
+      const struct source_metadata* source_metadata) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->UpdateTracksMetadata(source_metadata);
+    }
+  }
+
+  // The control API writes stream to FMQ
+  static size_t OutWritePcmData(const SessionType& session_type,
+                                const void* buffer, size_t bytes) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->OutWritePcmData(buffer, bytes);
+    }
+    return 0;
+  }
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/utils/session/BluetoothAudioSessionControl_2_1.h

@@ -0,0 +1,160 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioSession_2_1.h"
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioSessionControl_2_1 {
+  using SessionType_2_1 =
+      ::android::hardware::bluetooth::audio::V2_1::SessionType;
+  using AudioConfiguration_2_1 =
+      ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration;
+
+ public:
+  // The control API helps to check if session is ready or not
+  // @return: true if the Bluetooth stack has started th specified session
+  static bool IsSessionReady(const SessionType_2_1& session_type) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetAudioSession()->IsSessionReady();
+    }
+    return false;
+  }
+
+  // The control API helps the bluetooth_audio module to register
+  // PortStatusCallbacks
+  // @return: cookie - the assigned number to this bluetooth_audio output
+  static uint16_t RegisterControlResultCback(
+      const SessionType_2_1& session_type, const PortStatusCallbacks& cbacks) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetAudioSession()->RegisterStatusCback(cbacks);
+    }
+    return kObserversCookieUndefined;
+  }
+
+  // The control API helps the bluetooth_audio module to unregister
+  // PortStatusCallbacks
+  // @param: cookie - indicates which bluetooth_audio output is
+  static void UnregisterControlResultCback(const SessionType_2_1& session_type,
+                                           uint16_t cookie) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->GetAudioSession()->UnregisterStatusCback(cookie);
+    }
+  }
+
+  // The control API for the bluetooth_audio module to get current
+  // AudioConfiguration
+  static const AudioConfiguration_2_1 GetAudioConfig(
+      const SessionType_2_1& session_type) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetAudioConfig();
+    } else if (session_type ==
+               SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH) {
+      return BluetoothAudioSession_2_1::kInvalidOffloadAudioConfiguration;
+    } else {
+      return BluetoothAudioSession_2_1::kInvalidSoftwareAudioConfiguration;
+    }
+  }
+
+  // Those control APIs for the bluetooth_audio module to start / suspend / stop
+  // stream, to check position, and to update metadata.
+  static bool StartStream(const SessionType_2_1& session_type) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetAudioSession()->StartStream();
+    }
+    return false;
+  }
+
+  static bool SuspendStream(const SessionType_2_1& session_type) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetAudioSession()->SuspendStream();
+    }
+    return false;
+  }
+
+  static void StopStream(const SessionType_2_1& session_type) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->GetAudioSession()->StopStream();
+    }
+  }
+
+  static bool GetPresentationPosition(const SessionType_2_1& session_type,
+                                      uint64_t* remote_delay_report_ns,
+                                      uint64_t* total_bytes_readed,
+                                      timespec* data_position) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetAudioSession()->GetPresentationPosition(
+          remote_delay_report_ns, total_bytes_readed, data_position);
+    }
+    return false;
+  }
+
+  static void UpdateTracksMetadata(
+      const SessionType_2_1& session_type,
+      const struct source_metadata* source_metadata) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->GetAudioSession()->UpdateTracksMetadata(source_metadata);
+    }
+  }
+
+  // The control API writes stream to FMQ
+  static size_t OutWritePcmData(const SessionType_2_1& session_type,
+                                const void* buffer, size_t bytes) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetAudioSession()->OutWritePcmData(buffer, bytes);
+    }
+    return 0;
+  }
+
+  // The control API reads stream from FMQ
+  static size_t InReadPcmData(const SessionType_2_1& session_type, void* buffer,
+                              size_t bytes) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetAudioSession()->InReadPcmData(buffer, bytes);
+    }
+    return 0;
+  }
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/utils/session/BluetoothAudioSessionReport.h

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioSession.h"
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioSessionReport {
+ public:
+  // The API reports the Bluetooth stack has started the session, and will
+  // inform registered bluetooth_audio outputs
+  static void OnSessionStarted(const SessionType& session_type,
+                               const sp<IBluetoothAudioPort> host_iface,
+                               const DataMQ::Descriptor* dataMQ,
+                               const AudioConfiguration& audio_config) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->OnSessionStarted(host_iface, dataMQ, audio_config);
+    }
+  }
+  // The API reports the Bluetooth stack has ended the session, and will
+  // inform registered bluetooth_audio outputs
+  static void OnSessionEnded(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->OnSessionEnded();
+    }
+  }
+  // The API reports the Bluetooth stack has replied the result of startStream
+  // or suspendStream, and will inform registered bluetooth_audio outputs
+  static void ReportControlStatus(const SessionType& session_type,
+                                  const bool& start_resp,
+                                  const BluetoothAudioStatus& status) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->ReportControlStatus(start_resp, status);
+    }
+  }
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/utils/session/BluetoothAudioSessionReport_2_1.h

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioSession_2_1.h"
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioSessionReport_2_1 {
+ public:
+  // The API reports the Bluetooth stack has started the session, and will
+  // inform registered bluetooth_audio outputs
+  static void OnSessionStarted(
+      const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+          session_type,
+      const sp<IBluetoothAudioPort> host_iface,
+      const DataMQ::Descriptor* dataMQ,
+      const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration&
+          audio_config) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->OnSessionStarted(host_iface, dataMQ, audio_config);
+    }
+  }
+  // The API reports the Bluetooth stack has ended the session, and will
+  // inform registered bluetooth_audio outputs
+  static void OnSessionEnded(
+      const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+          session_type) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->GetAudioSession()->OnSessionEnded();
+    }
+  }
+  // The API reports the Bluetooth stack has replied the result of startStream
+  // or suspendStream, and will inform registered bluetooth_audio outputs
+  static void ReportControlStatus(
+      const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+          session_type,
+      const bool& start_resp, const BluetoothAudioStatus& status) {
+    std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+        BluetoothAudioSessionInstance_2_1::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->GetAudioSession()->ReportControlStatus(start_resp, status);
+    }
+  }
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/utils/session/BluetoothAudioSession_2_1.cpp

@@ -0,0 +1,229 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioProviderSession_2_1"
+
+#include "BluetoothAudioSession_2_1.h"
+
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+
+#include "../aidl_session/HidlToAidlMiddleware_2_0.h"
+#include "../aidl_session/HidlToAidlMiddleware_2_1.h"
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+using ::aidl::android::hardware::bluetooth::audio::HidlToAidlMiddleware_2_0;
+using ::aidl::android::hardware::bluetooth::audio::HidlToAidlMiddleware_2_1;
+using SessionType_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::SessionType;
+using SessionType_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SessionType;
+
+::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
+    BluetoothAudioSession_2_1::invalidSoftwareAudioConfiguration = {};
+::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
+    BluetoothAudioSession_2_1::invalidOffloadAudioConfiguration = {};
+
+namespace {
+bool is_2_0_session_type(
+    const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+        session_type) {
+  if (session_type == SessionType_2_1::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+      session_type == SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH ||
+      session_type == SessionType_2_1::HEARING_AID_SOFTWARE_ENCODING_DATAPATH) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+bool is_unsupported_2_1_session_type(
+    const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+        session_type) {
+  if (session_type ==
+          SessionType_2_1::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+      session_type ==
+          SessionType_2_1::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH) {
+    return true;
+  } else {
+    return false;
+  }
+}
+}  // namespace
+
+BluetoothAudioSession_2_1::BluetoothAudioSession_2_1(
+    const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+        session_type)
+    : audio_session(BluetoothAudioSessionInstance::GetSessionInstance(
+          static_cast<SessionType_2_0>(session_type))) {
+  if (is_2_0_session_type(session_type) ||
+      is_unsupported_2_1_session_type(session_type)) {
+    session_type_2_1_ = (SessionType_2_1::UNKNOWN);
+  } else {
+    session_type_2_1_ = (session_type);
+  }
+  raw_session_type_ = session_type;
+}
+
+std::shared_ptr<BluetoothAudioSession>
+BluetoothAudioSession_2_1::GetAudioSession() {
+  return audio_session;
+}
+
+// The control function is for the bluetooth_audio module to get the current
+// AudioConfiguration
+const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
+BluetoothAudioSession_2_1::GetAudioConfig() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_1::GetAudioConfig(raw_session_type_);
+  std::lock_guard<std::recursive_mutex> guard(audio_session->mutex_);
+  if (audio_session->IsSessionReady()) {
+    // If session is unknown it means it should be 2.0 type
+    if (session_type_2_1_ != SessionType_2_1::UNKNOWN)
+      return audio_config_2_1_;
+
+    ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration toConf;
+    const AudioConfiguration fromConf = GetAudioSession()->GetAudioConfig();
+    // pcmConfig only differs between 2.0 and 2.1 in AudioConfiguration
+    if (fromConf.getDiscriminator() ==
+        AudioConfiguration::hidl_discriminator::codecConfig) {
+      toConf.codecConfig(fromConf.codecConfig());
+    } else {
+      toConf.pcmConfig() = {
+          .sampleRate = static_cast<
+              ::android::hardware::bluetooth::audio::V2_1::SampleRate>(
+              fromConf.pcmConfig().sampleRate),
+          .channelMode = fromConf.pcmConfig().channelMode,
+          .bitsPerSample = fromConf.pcmConfig().bitsPerSample,
+          .dataIntervalUs = 0};
+    }
+    return toConf;
+  } else if (session_type_2_1_ ==
+             SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH) {
+    return kInvalidOffloadAudioConfiguration;
+  } else {
+    return kInvalidSoftwareAudioConfiguration;
+  }
+}
+
+bool BluetoothAudioSession_2_1::UpdateAudioConfig(
+    const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration&
+        audio_config) {
+  bool is_software_session =
+      (session_type_2_1_ == SessionType_2_1::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+       session_type_2_1_ ==
+           SessionType_2_1::HEARING_AID_SOFTWARE_ENCODING_DATAPATH ||
+       session_type_2_1_ ==
+           SessionType_2_1::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH ||
+       session_type_2_1_ ==
+           SessionType_2_1::LE_AUDIO_SOFTWARE_DECODED_DATAPATH);
+  bool is_offload_a2dp_session =
+      (session_type_2_1_ == SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH);
+  auto audio_config_discriminator = audio_config.getDiscriminator();
+  bool is_software_audio_config =
+      (is_software_session &&
+       audio_config_discriminator ==
+           ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration::
+               hidl_discriminator::pcmConfig);
+  bool is_a2dp_offload_audio_config =
+      (is_offload_a2dp_session &&
+       audio_config_discriminator ==
+           ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration::
+               hidl_discriminator::codecConfig);
+  if (!is_software_audio_config && !is_a2dp_offload_audio_config) {
+    return false;
+  }
+  audio_config_2_1_ = audio_config;
+  return true;
+}
+
+// The report function is used to report that the Bluetooth stack has started
+// this session without any failure, and will invoke session_changed_cb_ to
+// notify those registered bluetooth_audio outputs
+void BluetoothAudioSession_2_1::OnSessionStarted(
+    const sp<IBluetoothAudioPort> stack_iface, const DataMQ::Descriptor* dataMQ,
+    const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration&
+        audio_config) {
+  if (session_type_2_1_ == SessionType_2_1::UNKNOWN) {
+    ::android::hardware::bluetooth::audio::V2_0::AudioConfiguration config;
+    if (audio_config.getDiscriminator() ==
+        ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration::
+            hidl_discriminator::codecConfig) {
+      config.codecConfig(audio_config.codecConfig());
+    } else {
+      auto& tmpPcm = audio_config.pcmConfig();
+      config.pcmConfig(
+          ::android::hardware::bluetooth::audio::V2_0::PcmParameters{
+              .sampleRate = static_cast<SampleRate>(tmpPcm.sampleRate),
+              .channelMode = tmpPcm.channelMode,
+              .bitsPerSample = tmpPcm.bitsPerSample
+              /*dataIntervalUs is not passed to 2.0 */
+          });
+    }
+
+    audio_session->OnSessionStarted(stack_iface, dataMQ, config);
+  } else {
+    std::lock_guard<std::recursive_mutex> guard(audio_session->mutex_);
+    if (stack_iface == nullptr) {
+      LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_2_1_)
+                 << ", IBluetoothAudioPort Invalid";
+    } else if (!UpdateAudioConfig(audio_config)) {
+      LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_2_1_)
+                 << ", AudioConfiguration=" << toString(audio_config)
+                 << " Invalid";
+    } else if (!audio_session->UpdateDataPath(dataMQ)) {
+      LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_2_1_)
+                 << " DataMQ Invalid";
+      audio_config_2_1_ =
+          (session_type_2_1_ == SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH
+               ? kInvalidOffloadAudioConfiguration
+               : kInvalidSoftwareAudioConfiguration);
+    } else {
+      audio_session->stack_iface_ = stack_iface;
+      LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_2_1_)
+                << ", AudioConfiguration=" << toString(audio_config);
+      audio_session->ReportSessionStatus();
+    };
+  }
+}
+
+std::unique_ptr<BluetoothAudioSessionInstance_2_1>
+    BluetoothAudioSessionInstance_2_1::instance_ptr =
+        std::unique_ptr<BluetoothAudioSessionInstance_2_1>(
+            new BluetoothAudioSessionInstance_2_1());
+
+// API to fetch the session of A2DP / Hearing Aid
+std::shared_ptr<BluetoothAudioSession_2_1>
+BluetoothAudioSessionInstance_2_1::GetSessionInstance(
+    const SessionType_2_1& session_type) {
+  std::lock_guard<std::mutex> guard(instance_ptr->mutex_);
+  if (!instance_ptr->sessions_map_.empty()) {
+    auto entry = instance_ptr->sessions_map_.find(session_type);
+    if (entry != instance_ptr->sessions_map_.end()) {
+      return entry->second;
+    }
+  }
+  std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
+      std::make_shared<BluetoothAudioSession_2_1>(session_type);
+  instance_ptr->sessions_map_[session_type] = session_ptr;
+  return session_ptr;
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/utils/session/BluetoothAudioSession_2_1.h

@@ -0,0 +1,95 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <android/hardware/bluetooth/audio/2.1/types.h>
+#include "BluetoothAudioSession.h"
+
+#include <mutex>
+#include <unordered_map>
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioSession_2_1 {
+ private:
+  std::shared_ptr<BluetoothAudioSession> audio_session;
+
+  ::android::hardware::bluetooth::audio::V2_1::SessionType session_type_2_1_;
+  ::android::hardware::bluetooth::audio::V2_1::SessionType raw_session_type_;
+
+  // audio data configuration for both software and offloading
+  ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
+      audio_config_2_1_;
+
+  bool UpdateAudioConfig(
+      const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration&
+          audio_config);
+
+  static ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
+      invalidSoftwareAudioConfiguration;
+  static ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
+      invalidOffloadAudioConfiguration;
+
+ public:
+  BluetoothAudioSession_2_1(
+      const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+          session_type);
+
+  std::shared_ptr<BluetoothAudioSession> GetAudioSession();
+
+  // The report function is used to report that the Bluetooth stack has started
+  // this session without any failure, and will invoke session_changed_cb_ to
+  // notify those registered bluetooth_audio outputs
+  void OnSessionStarted(
+      const sp<IBluetoothAudioPort> stack_iface,
+      const DataMQ::Descriptor* dataMQ,
+      const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration&
+          audio_config);
+
+  // The control function is for the bluetooth_audio module to get the current
+  // AudioConfiguration
+  const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
+  GetAudioConfig();
+
+  static constexpr ::android::hardware::bluetooth::audio::V2_1::
+      AudioConfiguration& kInvalidSoftwareAudioConfiguration =
+          invalidSoftwareAudioConfiguration;
+  static constexpr ::android::hardware::bluetooth::audio::V2_1::
+      AudioConfiguration& kInvalidOffloadAudioConfiguration =
+          invalidOffloadAudioConfiguration;
+};
+
+class BluetoothAudioSessionInstance_2_1 {
+ public:
+  // The API is to fetch the specified session of A2DP / Hearing Aid
+  static std::shared_ptr<BluetoothAudioSession_2_1> GetSessionInstance(
+      const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+          session_type);
+
+ private:
+  static std::unique_ptr<BluetoothAudioSessionInstance_2_1> instance_ptr;
+  std::mutex mutex_;
+  std::unordered_map<::android::hardware::bluetooth::audio::V2_1::SessionType,
+                     std::shared_ptr<BluetoothAudioSession_2_1>>
+      sessions_map_;
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/utils/session/BluetoothAudioSupportedCodecsDB.cpp

@@ -0,0 +1,415 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioProviderSessionCodecsDB"
+
+#include "BluetoothAudioSupportedCodecsDB.h"
+
+#include <android-base/logging.h>
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+
+using ::android::hardware::bluetooth::audio::V2_0::AacObjectType;
+using ::android::hardware::bluetooth::audio::V2_0::AacParameters;
+using ::android::hardware::bluetooth::audio::V2_0::AacVariableBitRate;
+using ::android::hardware::bluetooth::audio::V2_0::AptxParameters;
+using ::android::hardware::bluetooth::audio::V2_0::BitsPerSample;
+using ::android::hardware::bluetooth::audio::V2_0::ChannelMode;
+using ::android::hardware::bluetooth::audio::V2_0::CodecType;
+using ::android::hardware::bluetooth::audio::V2_0::LdacChannelMode;
+using ::android::hardware::bluetooth::audio::V2_0::LdacParameters;
+using ::android::hardware::bluetooth::audio::V2_0::LdacQualityIndex;
+using ::android::hardware::bluetooth::audio::V2_0::SampleRate;
+using ::android::hardware::bluetooth::audio::V2_0::SbcAllocMethod;
+using ::android::hardware::bluetooth::audio::V2_0::SbcBlockLength;
+using ::android::hardware::bluetooth::audio::V2_0::SbcChannelMode;
+using ::android::hardware::bluetooth::audio::V2_0::SbcNumSubbands;
+using ::android::hardware::bluetooth::audio::V2_0::SbcParameters;
+
+// Default Supported PCM Parameters
+static const PcmParameters kDefaultSoftwarePcmCapabilities = {
+    .sampleRate = static_cast<SampleRate>(
+        SampleRate::RATE_44100 | SampleRate::RATE_48000 |
+        SampleRate::RATE_88200 | SampleRate::RATE_96000 |
+        SampleRate::RATE_16000 | SampleRate::RATE_24000),
+    .channelMode =
+        static_cast<ChannelMode>(ChannelMode::MONO | ChannelMode::STEREO),
+    .bitsPerSample = static_cast<BitsPerSample>(BitsPerSample::BITS_16 |
+                                                BitsPerSample::BITS_24 |
+                                                BitsPerSample::BITS_32)};
+
+// Default Supported Codecs
+// SBC: mSampleRate:(44100), mBitsPerSample:(16), mChannelMode:(MONO|STEREO)
+//      all blocks | subbands 8 | Loudness
+static const SbcParameters kDefaultOffloadSbcCapability = {
+    .sampleRate = SampleRate::RATE_44100,
+    .channelMode = static_cast<SbcChannelMode>(SbcChannelMode::MONO |
+                                               SbcChannelMode::JOINT_STEREO),
+    .blockLength = static_cast<SbcBlockLength>(
+        SbcBlockLength::BLOCKS_4 | SbcBlockLength::BLOCKS_8 |
+        SbcBlockLength::BLOCKS_12 | SbcBlockLength::BLOCKS_16),
+    .numSubbands = SbcNumSubbands::SUBBAND_8,
+    .allocMethod = SbcAllocMethod::ALLOC_MD_L,
+    .bitsPerSample = BitsPerSample::BITS_16,
+    .minBitpool = 2,
+    .maxBitpool = 53};
+
+// AAC: mSampleRate:(44100), mBitsPerSample:(16), mChannelMode:(STEREO)
+static const AacParameters kDefaultOffloadAacCapability = {
+    .objectType = AacObjectType::MPEG2_LC,
+    .sampleRate = SampleRate::RATE_44100,
+    .channelMode = ChannelMode::STEREO,
+    .variableBitRateEnabled = AacVariableBitRate::ENABLED,
+    .bitsPerSample = BitsPerSample::BITS_16};
+
+// LDAC: mSampleRate:(44100|48000|88200|96000), mBitsPerSample:(16|24|32),
+//       mChannelMode:(DUAL|STEREO)
+static const LdacParameters kDefaultOffloadLdacCapability = {
+    .sampleRate = static_cast<SampleRate>(
+        SampleRate::RATE_44100 | SampleRate::RATE_48000 |
+        SampleRate::RATE_88200 | SampleRate::RATE_96000),
+    .channelMode = static_cast<LdacChannelMode>(LdacChannelMode::DUAL |
+                                                LdacChannelMode::STEREO),
+    .qualityIndex = LdacQualityIndex::QUALITY_HIGH,
+    .bitsPerSample = static_cast<BitsPerSample>(BitsPerSample::BITS_16 |
+                                                BitsPerSample::BITS_24 |
+                                                BitsPerSample::BITS_32)};
+
+// aptX: mSampleRate:(44100|48000), mBitsPerSample:(16), mChannelMode:(STEREO)
+static const AptxParameters kDefaultOffloadAptxCapability = {
+    .sampleRate = static_cast<SampleRate>(SampleRate::RATE_44100 |
+                                          SampleRate::RATE_48000),
+    .channelMode = ChannelMode::STEREO,
+    .bitsPerSample = BitsPerSample::BITS_16,
+};
+
+// aptX HD: mSampleRate:(44100|48000), mBitsPerSample:(24),
+//          mChannelMode:(STEREO)
+static const AptxParameters kDefaultOffloadAptxHdCapability = {
+    .sampleRate = static_cast<SampleRate>(SampleRate::RATE_44100 |
+                                          SampleRate::RATE_48000),
+    .channelMode = ChannelMode::STEREO,
+    .bitsPerSample = BitsPerSample::BITS_24,
+};
+
+const std::vector<CodecCapabilities> kDefaultOffloadA2dpCodecCapabilities = {
+    {.codecType = CodecType::SBC, .capabilities = {}},
+    {.codecType = CodecType::AAC, .capabilities = {}},
+    {.codecType = CodecType::LDAC, .capabilities = {}},
+    {.codecType = CodecType::APTX, .capabilities = {}},
+    {.codecType = CodecType::APTX_HD, .capabilities = {}}};
+
+static bool IsSingleBit(uint32_t bitmasks, uint32_t bitfield) {
+  bool single = false;
+  uint32_t test_bit = 0x00000001;
+  while (test_bit <= bitmasks && test_bit <= bitfield) {
+    if (bitfield & test_bit && bitmasks & test_bit) {
+      if (single) return false;
+      single = true;
+    }
+    if (test_bit == 0x80000000) break;
+    test_bit <<= 1;
+  }
+  return single;
+}
+
+static bool IsOffloadSbcConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific);
+static bool IsOffloadAacConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific);
+static bool IsOffloadLdacConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific);
+static bool IsOffloadAptxConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific);
+static bool IsOffloadAptxHdConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific);
+
+static bool IsOffloadSbcConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getDiscriminator() !=
+      CodecConfiguration::CodecSpecific::hidl_discriminator::sbcConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << toString(codec_specific);
+    return false;
+  }
+  const SbcParameters sbc_data = codec_specific.sbcConfig();
+  if (!IsSingleBit(static_cast<uint32_t>(sbc_data.sampleRate), 0xff) ||
+      !IsSingleBit(static_cast<uint32_t>(sbc_data.channelMode), 0x0f) ||
+      !IsSingleBit(static_cast<uint32_t>(sbc_data.blockLength), 0xf0) ||
+      !IsSingleBit(static_cast<uint32_t>(sbc_data.numSubbands), 0x0c) ||
+      !IsSingleBit(static_cast<uint32_t>(sbc_data.allocMethod), 0x03) ||
+      !IsSingleBit(static_cast<uint32_t>(sbc_data.bitsPerSample), 0x07) ||
+      sbc_data.minBitpool > sbc_data.maxBitpool) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << toString(codec_specific);
+    return false;
+  } else if ((sbc_data.sampleRate & kDefaultOffloadSbcCapability.sampleRate) &&
+             (sbc_data.channelMode &
+              kDefaultOffloadSbcCapability.channelMode) &&
+             (sbc_data.blockLength &
+              kDefaultOffloadSbcCapability.blockLength) &&
+             (sbc_data.numSubbands &
+              kDefaultOffloadSbcCapability.numSubbands) &&
+             (sbc_data.allocMethod &
+              kDefaultOffloadSbcCapability.allocMethod) &&
+             (sbc_data.bitsPerSample &
+              kDefaultOffloadSbcCapability.bitsPerSample) &&
+             (kDefaultOffloadSbcCapability.minBitpool <= sbc_data.minBitpool &&
+              sbc_data.maxBitpool <= kDefaultOffloadSbcCapability.maxBitpool)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << toString(codec_specific);
+  return false;
+}
+
+static bool IsOffloadAacConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getDiscriminator() !=
+      CodecConfiguration::CodecSpecific::hidl_discriminator::aacConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << toString(codec_specific);
+    return false;
+  }
+  const AacParameters aac_data = codec_specific.aacConfig();
+  if (!IsSingleBit(static_cast<uint32_t>(aac_data.objectType), 0xf0) ||
+      !IsSingleBit(static_cast<uint32_t>(aac_data.sampleRate), 0xff) ||
+      !IsSingleBit(static_cast<uint32_t>(aac_data.channelMode), 0x03) ||
+      !IsSingleBit(static_cast<uint32_t>(aac_data.bitsPerSample), 0x07)) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << toString(codec_specific);
+    return false;
+  } else if ((aac_data.objectType & kDefaultOffloadAacCapability.objectType) &&
+             (aac_data.sampleRate & kDefaultOffloadAacCapability.sampleRate) &&
+             (aac_data.channelMode &
+              kDefaultOffloadAacCapability.channelMode) &&
+             (aac_data.variableBitRateEnabled == AacVariableBitRate::DISABLED ||
+              kDefaultOffloadAacCapability.variableBitRateEnabled ==
+                  AacVariableBitRate::ENABLED) &&
+             (aac_data.bitsPerSample &
+              kDefaultOffloadAacCapability.bitsPerSample)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << toString(codec_specific);
+  return false;
+}
+
+static bool IsOffloadLdacConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getDiscriminator() !=
+      CodecConfiguration::CodecSpecific::hidl_discriminator::ldacConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << toString(codec_specific);
+    return false;
+  }
+  const LdacParameters ldac_data = codec_specific.ldacConfig();
+  if (!IsSingleBit(static_cast<uint32_t>(ldac_data.sampleRate), 0xff) ||
+      !IsSingleBit(static_cast<uint32_t>(ldac_data.channelMode), 0x07) ||
+      (ldac_data.qualityIndex > LdacQualityIndex::QUALITY_LOW &&
+       ldac_data.qualityIndex != LdacQualityIndex::QUALITY_ABR) ||
+      !IsSingleBit(static_cast<uint32_t>(ldac_data.bitsPerSample), 0x07)) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << toString(codec_specific);
+    return false;
+  } else if ((ldac_data.sampleRate &
+              kDefaultOffloadLdacCapability.sampleRate) &&
+             (ldac_data.channelMode &
+              kDefaultOffloadLdacCapability.channelMode) &&
+             (ldac_data.bitsPerSample &
+              kDefaultOffloadLdacCapability.bitsPerSample)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << toString(codec_specific);
+  return false;
+}
+
+static bool IsOffloadAptxConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getDiscriminator() !=
+      CodecConfiguration::CodecSpecific::hidl_discriminator::aptxConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << toString(codec_specific);
+    return false;
+  }
+  const AptxParameters aptx_data = codec_specific.aptxConfig();
+  if (!IsSingleBit(static_cast<uint32_t>(aptx_data.sampleRate), 0xff) ||
+      !IsSingleBit(static_cast<uint32_t>(aptx_data.channelMode), 0x03) ||
+      !IsSingleBit(static_cast<uint32_t>(aptx_data.bitsPerSample), 0x07)) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << toString(codec_specific);
+    return false;
+  } else if ((aptx_data.sampleRate &
+              kDefaultOffloadAptxCapability.sampleRate) &&
+             (aptx_data.channelMode &
+              kDefaultOffloadAptxCapability.channelMode) &&
+             (aptx_data.bitsPerSample &
+              kDefaultOffloadAptxCapability.bitsPerSample)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << toString(codec_specific);
+  return false;
+}
+
+static bool IsOffloadAptxHdConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getDiscriminator() !=
+      CodecConfiguration::CodecSpecific::hidl_discriminator::aptxConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << toString(codec_specific);
+    return false;
+  }
+  const AptxParameters aptx_data = codec_specific.aptxConfig();
+  if (!IsSingleBit(static_cast<uint32_t>(aptx_data.sampleRate), 0xff) ||
+      !IsSingleBit(static_cast<uint32_t>(aptx_data.channelMode), 0x03) ||
+      !IsSingleBit(static_cast<uint32_t>(aptx_data.bitsPerSample), 0x07)) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << toString(codec_specific);
+    return false;
+  } else if ((aptx_data.sampleRate &
+              kDefaultOffloadAptxHdCapability.sampleRate) &&
+             (aptx_data.channelMode &
+              kDefaultOffloadAptxHdCapability.channelMode) &&
+             (aptx_data.bitsPerSample &
+              kDefaultOffloadAptxHdCapability.bitsPerSample)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << toString(codec_specific);
+  return false;
+}
+
+std::vector<PcmParameters> GetSoftwarePcmCapabilities() {
+  return std::vector<PcmParameters>(1, kDefaultSoftwarePcmCapabilities);
+}
+
+std::vector<CodecCapabilities> GetOffloadCodecCapabilities(
+    const SessionType& session_type) {
+  if (session_type != SessionType::A2DP_HARDWARE_OFFLOAD_DATAPATH) {
+    return std::vector<CodecCapabilities>(0);
+  }
+  std::vector<CodecCapabilities> offload_a2dp_codec_capabilities =
+      kDefaultOffloadA2dpCodecCapabilities;
+  for (auto& codec_capability : offload_a2dp_codec_capabilities) {
+    switch (codec_capability.codecType) {
+      case CodecType::SBC:
+        codec_capability.capabilities.sbcCapabilities(
+            kDefaultOffloadSbcCapability);
+        break;
+      case CodecType::AAC:
+        codec_capability.capabilities.aacCapabilities(
+            kDefaultOffloadAacCapability);
+        break;
+      case CodecType::LDAC:
+        codec_capability.capabilities.ldacCapabilities(
+            kDefaultOffloadLdacCapability);
+        break;
+      case CodecType::APTX:
+        codec_capability.capabilities.aptxCapabilities(
+            kDefaultOffloadAptxCapability);
+        break;
+      case CodecType::APTX_HD:
+        codec_capability.capabilities.aptxCapabilities(
+            kDefaultOffloadAptxHdCapability);
+        break;
+      case CodecType::UNKNOWN:
+        codec_capability = {};
+        break;
+    }
+  }
+  return offload_a2dp_codec_capabilities;
+}
+
+bool IsSoftwarePcmConfigurationValid(const PcmParameters& pcm_config) {
+  if ((pcm_config.sampleRate != SampleRate::RATE_44100 &&
+       pcm_config.sampleRate != SampleRate::RATE_48000 &&
+       pcm_config.sampleRate != SampleRate::RATE_88200 &&
+       pcm_config.sampleRate != SampleRate::RATE_96000 &&
+       pcm_config.sampleRate != SampleRate::RATE_16000 &&
+       pcm_config.sampleRate != SampleRate::RATE_24000) ||
+      (pcm_config.bitsPerSample != BitsPerSample::BITS_16 &&
+       pcm_config.bitsPerSample != BitsPerSample::BITS_24 &&
+       pcm_config.bitsPerSample != BitsPerSample::BITS_32) ||
+      (pcm_config.channelMode != ChannelMode::MONO &&
+       pcm_config.channelMode != ChannelMode::STEREO)) {
+    LOG(WARNING) << __func__
+                 << ": Invalid PCM Configuration=" << toString(pcm_config);
+    return false;
+  } else if (pcm_config.sampleRate &
+                 kDefaultSoftwarePcmCapabilities.sampleRate &&
+             pcm_config.bitsPerSample &
+                 kDefaultSoftwarePcmCapabilities.bitsPerSample &&
+             pcm_config.channelMode &
+                 kDefaultSoftwarePcmCapabilities.channelMode) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported PCM Configuration=" << toString(pcm_config);
+  return false;
+}
+
+bool IsOffloadCodecConfigurationValid(const SessionType& session_type,
+                                      const CodecConfiguration& codec_config) {
+  if (session_type != SessionType::A2DP_HARDWARE_OFFLOAD_DATAPATH) {
+    LOG(ERROR) << __func__
+               << ": Invalid SessionType=" << toString(session_type);
+    return false;
+  } else if (codec_config.encodedAudioBitrate < 0x00000001 ||
+             0x00ffffff < codec_config.encodedAudioBitrate) {
+    LOG(ERROR) << __func__ << ": Unsupported Codec Configuration="
+               << toString(codec_config);
+    return false;
+  }
+  const CodecConfiguration::CodecSpecific& codec_specific = codec_config.config;
+  switch (codec_config.codecType) {
+    case CodecType::SBC:
+      if (IsOffloadSbcConfigurationValid(codec_specific)) {
+        return true;
+      }
+      return false;
+    case CodecType::AAC:
+      if (IsOffloadAacConfigurationValid(codec_specific)) {
+        return true;
+      }
+      return false;
+    case CodecType::LDAC:
+      if (IsOffloadLdacConfigurationValid(codec_specific)) {
+        return true;
+      }
+      return false;
+    case CodecType::APTX:
+      if (IsOffloadAptxConfigurationValid(codec_specific)) {
+        return true;
+      }
+      return false;
+    case CodecType::APTX_HD:
+      if (IsOffloadAptxHdConfigurationValid(codec_specific)) {
+        return true;
+      }
+      return false;
+    case CodecType::UNKNOWN:
+      return false;
+  }
+  return false;
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/utils/session/BluetoothAudioSupportedCodecsDB.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <android/hardware/bluetooth/audio/2.0/types.h>
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+
+using ::android::hardware::bluetooth::audio::V2_0::CodecCapabilities;
+using ::android::hardware::bluetooth::audio::V2_0::CodecConfiguration;
+using ::android::hardware::bluetooth::audio::V2_0::PcmParameters;
+using ::android::hardware::bluetooth::audio::V2_0::SessionType;
+
+std::vector<PcmParameters> GetSoftwarePcmCapabilities();
+std::vector<CodecCapabilities> GetOffloadCodecCapabilities(
+    const SessionType& session_type);
+
+bool IsSoftwarePcmConfigurationValid(const PcmParameters& pcm_config);
+bool IsOffloadCodecConfigurationValid(const SessionType& session_type,
+                                      const CodecConfiguration& codec_config);
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/utils/session/BluetoothAudioSupportedCodecsDB_2_1.cpp

@@ -0,0 +1,142 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioProviderSessionCodecsDB_2_1"
+
+#include "BluetoothAudioSupportedCodecsDB_2_1.h"
+
+#include <android-base/logging.h>
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+
+using ::android::hardware::bluetooth::audio::V2_0::BitsPerSample;
+using ::android::hardware::bluetooth::audio::V2_0::ChannelMode;
+
+using SampleRate_2_0 = ::android::hardware::bluetooth::audio::V2_0::SampleRate;
+using SampleRate_2_1 = ::android::hardware::bluetooth::audio::V2_1::SampleRate;
+
+using SessionType_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::SessionType;
+using SessionType_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SessionType;
+
+namespace {
+bool is_2_0_session_type(
+    const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+        session_type) {
+  if (session_type == SessionType_2_1::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+      session_type == SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH ||
+      session_type == SessionType_2_1::HEARING_AID_SOFTWARE_ENCODING_DATAPATH) {
+    return true;
+  } else {
+    return false;
+  }
+}
+}  // namespace
+
+static const ::android::hardware::bluetooth::audio::V2_1::PcmParameters
+    kDefaultSoftwarePcmCapabilities_2_1 = {
+        .sampleRate = static_cast<SampleRate_2_1>(
+            SampleRate_2_1::RATE_44100 | SampleRate_2_1::RATE_48000 |
+            SampleRate_2_1::RATE_88200 | SampleRate_2_1::RATE_96000 |
+            SampleRate_2_1::RATE_16000 | SampleRate_2_1::RATE_24000),
+        .channelMode =
+            static_cast<ChannelMode>(ChannelMode::MONO | ChannelMode::STEREO),
+        .bitsPerSample = static_cast<BitsPerSample>(BitsPerSample::BITS_16 |
+                                                    BitsPerSample::BITS_24 |
+                                                    BitsPerSample::BITS_32)};
+
+std::vector<::android::hardware::bluetooth::audio::V2_1::PcmParameters>
+GetSoftwarePcmCapabilities_2_1() {
+  return std::vector<
+      ::android::hardware::bluetooth::audio::V2_1::PcmParameters>(
+      1, kDefaultSoftwarePcmCapabilities_2_1);
+}
+
+std::vector<CodecCapabilities> GetOffloadCodecCapabilities(
+    const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+        session_type) {
+  if (is_2_0_session_type(session_type)) {
+    return GetOffloadCodecCapabilities(
+        static_cast<SessionType_2_0>(session_type));
+  }
+  return std::vector<CodecCapabilities>(0);
+}
+
+bool IsSoftwarePcmConfigurationValid_2_1(
+    const ::android::hardware::bluetooth::audio::V2_1::PcmParameters&
+        pcm_config) {
+  if ((pcm_config.sampleRate != SampleRate_2_1::RATE_44100 &&
+       pcm_config.sampleRate != SampleRate_2_1::RATE_48000 &&
+       pcm_config.sampleRate != SampleRate_2_1::RATE_88200 &&
+       pcm_config.sampleRate != SampleRate_2_1::RATE_96000 &&
+       pcm_config.sampleRate != SampleRate_2_1::RATE_16000 &&
+       pcm_config.sampleRate != SampleRate_2_1::RATE_24000) ||
+      (pcm_config.bitsPerSample != BitsPerSample::BITS_16 &&
+       pcm_config.bitsPerSample != BitsPerSample::BITS_24 &&
+       pcm_config.bitsPerSample != BitsPerSample::BITS_32) ||
+      (pcm_config.channelMode != ChannelMode::MONO &&
+       pcm_config.channelMode != ChannelMode::STEREO)) {
+    LOG(WARNING) << __func__
+                 << ": Invalid PCM Configuration=" << toString(pcm_config);
+    return false;
+  } else if (pcm_config.sampleRate &
+                 kDefaultSoftwarePcmCapabilities_2_1.sampleRate &&
+             pcm_config.bitsPerSample &
+                 kDefaultSoftwarePcmCapabilities_2_1.bitsPerSample &&
+             pcm_config.channelMode &
+                 kDefaultSoftwarePcmCapabilities_2_1.channelMode &&
+             pcm_config.dataIntervalUs != 0) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported PCM Configuration=" << toString(pcm_config);
+  return false;
+}
+
+bool IsOffloadCodecConfigurationValid(
+    const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+        session_type,
+    const ::android::hardware::bluetooth::audio::V2_0::CodecConfiguration&
+        codec_config) {
+  if (is_2_0_session_type(session_type)) {
+    return IsOffloadCodecConfigurationValid(
+        static_cast<SessionType_2_0>(session_type), codec_config);
+  }
+
+  return false;
+}
+
+bool IsOffloadLeAudioConfigurationValid(
+    const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+        session_type,
+    const ::android::hardware::bluetooth::audio::V2_1::Lc3CodecConfiguration&) {
+
+  if (session_type != SessionType_2_1::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH &&
+      session_type != SessionType_2_1::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH) {
+    return false;
+  }
+
+  //TODO: perform checks on le_audio_codec_config once we know supported parameters
+
+  return true;
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

bluetooth/audio/utils/session/BluetoothAudioSupportedCodecsDB_2_1.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioSupportedCodecsDB.h"
+
+#include <android/hardware/bluetooth/audio/2.1/types.h>
+
+namespace android {
+namespace bluetooth {
+namespace audio {
+
+std::vector<::android::hardware::bluetooth::audio::V2_1::PcmParameters>
+GetSoftwarePcmCapabilities_2_1();
+std::vector<::android::hardware::bluetooth::audio::V2_0::CodecCapabilities>
+GetOffloadCodecCapabilities(
+    const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+        session_type);
+
+bool IsSoftwarePcmConfigurationValid_2_1(
+    const ::android::hardware::bluetooth::audio::V2_1::PcmParameters&
+        pcm_config);
+
+bool IsOffloadCodecConfigurationValid(
+    const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+        session_type,
+    const ::android::hardware::bluetooth::audio::V2_0::CodecConfiguration&
+        codec_config);
+
+bool IsOffloadLeAudioConfigurationValid(
+    const ::android::hardware::bluetooth::audio::V2_1::SessionType&
+        session_type,
+    const ::android::hardware::bluetooth::audio::V2_1::Lc3CodecConfiguration&
+        le_audio_codec_config);
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace android

board-base.mk

@@ -1,5 +1,8 @@
 TARGET_SYSTEM_PROP := device/phh/treble/system.prop $(TARGET_SYSTEM_PROP)
-BOARD_BLUETOOTH_BDROID_BUILDCFG_INCLUDE_DIR := device/phh/treble/bluetooth
+
+# Bluetooth
+BOARD_BLUETOOTH_BDROID_BUILDCFG_INCLUDE_DIR := device/phh/treble/bluetooth/include
+
 TARGET_EXFAT_DRIVER := exfat
 DEVICE_FRAMEWORK_MANIFEST_FILE := device/phh/treble/framework_manifest.xml
 

files/rosemary-excluded-input-devices.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!-- Copyright (c) 2018 The Linux Foundation. All rights reserved.          -->
+<!--                                                                        -->
+<!-- Redistribution and use in source and binary forms, with or without     -->
+<!-- modification, are permitted provided that the following conditions are -->
+<!-- met:                                                                   -->
+<!--     * Redistributions of source code must retain the above copyright   -->
+<!--       notice, this list of conditions and the following disclaimer.    -->
+<!--     * Redistributions in binary form must reproduce the above          -->
+<!--       copyright notice, this list of conditions and the following      -->
+<!--       disclaimer in the documentation and/or other materials provided  -->
+<!--       with the distribution.                                           -->
+<!--     * Neither the name of The Linux Foundation nor the names of its    -->
+<!--       contributors may be used to endorse or promote products derived  -->
+<!--       from this software without specific prior written permission.    -->
+<!--                                                                        -->
+<!-- THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED           -->
+<!-- WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF   -->
+<!-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT -->
+<!-- ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS -->
+<!-- BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR -->
+<!-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF   -->
+<!-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR        -->
+<!-- BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,  -->
+<!-- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE   -->
+<!-- OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN -->
+<!-- IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                          -->
+<devices>
+    <device name="uinput-fpc" />
+    <device name="uinput-goodix" />
+</devices>

gapps.mk

@@ -4,14 +4,15 @@ ifneq ($(wildcard vendor/google)$(wildcard vendor/partner_gms),)
 -include vendor/partner_gms/products/gms.mk
 PRODUCT_SHIPPING_API_LEVEL :=
 
-PRODUCT_PACKAGES := $(filter-out CalendarGoogle, $(PRODUCT_PACKAGES))
-PRODUCT_PACKAGES := $(filter-out GoogleContacts, $(PRODUCT_PACKAGES))
+#PRODUCT_PACKAGES := $(filter-out CalendarGoogle, $(PRODUCT_PACKAGES))
+#PRODUCT_PACKAGES := $(filter-out GoogleContacts, $(PRODUCT_PACKAGES))
 
 PRODUCT_PACKAGES += \
 	phh-gapps-overrides \
 	Chrome \
 	GoogleContactsSyncAdapter \
 	talkback \
+        Photos \
 
 PRODUCT_SYSTEM_DEFAULT_PROPERTIES := $(filter-out ro.boot.vendor.overlay.theme=%,$(PRODUCT_SYSTEM_DEFAULT_PROPERTIES))
 endif

generate.sh

@@ -92,7 +92,7 @@ PRODUCT_SYSTEM_BRAND := google
 PRODUCT_MODEL := Phh-Treble $apps_name
 
 # Overwrite the inherited "emulator" characteristics
-PRODUCT_CHARACTERISTICS := device
+PRODUCT_CHARACTERISTICS := tablet
 
 PRODUCT_PACKAGES += $extra_packages
 

ota/phh-ota.cpp

@@ -14,6 +14,17 @@ using namespace std::chrono_literals;
 using namespace std::string_literals;
 using android::fiemap::IImageManager;
 
+
+std::string getNextSlot() {
+    std::string current_slot;
+    std::string next_slot = "a";
+    if(android::base::ReadFileToString("/metadata/phh/img", &current_slot) &&
+        current_slot.c_str()[0] == 'a') {
+            next_slot = "b";
+    }
+    return next_slot;
+}
+
 int main(int argc, char **argv) {
 	mkdir("/metadata/gsi/phh", 0771);
 	chown("/metadata/gsi/phh", 0, 1000);
@@ -27,27 +38,13 @@ int main(int argc, char **argv) {
 		return 0;
 	}
 	if(argc>=2 && strcmp(argv[1], "switch-slot") == 0) {
-		std::string current_slot;
-		std::string next_slot;
-		if(!android::base::ReadFileToString("/metadata/phh/img", &current_slot)) {
-			next_slot = "a";
-		} else {
-			if(current_slot.c_str()[0] == 'a')
-				next_slot = "b";
-		}
+		std::string next_slot = getNextSlot();
 		mkdir("/metadata/phh", 0700);
 		android::base::WriteStringToFile(next_slot, "/metadata/phh/img");
 		return 0;
 	}
 	if(argc>=2 && strcmp(argv[1], "new-slot") == 0) {
-		std::string current_slot;
-		std::string next_slot;
-		if(!android::base::ReadFileToString("/metadata/phh/img", &current_slot)) {
-			next_slot = "a";
-		} else {
-			if(current_slot.c_str()[0] == 'a')
-				next_slot = "b";
-		}
+		std::string next_slot = getNextSlot();
 
 		std::string imageName = "system_otaphh_"s + next_slot;
 

overlay/frameworks/base/core/res/res/values/config.xml

@@ -22,7 +22,6 @@
 	<string name="config_icon_mask" translatable="false">"M50 0C77.6 0 100 22.4 100 50C100 77.6 77.6 100 50 100C22.4 100 0 77.6 0 50C0 22.4 22.4 0 50 0Z"</string>
 	<bool name="config_useRoundIcon">true</bool>
 
-	<string name="config_wallpaperCropperPackage">com.android.wallpaperpicker</string>
 	<bool name="config_unplugTurnsOnScreen">true</bool>
 	<integer name="config_multiuserMaximumUsers">5</integer>
 	<bool name="config_enableMultiUserUI">true</bool>

overlay/packages/apps/Settings/res/values/config.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2019 The Android Open Source Project
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+          http://www.apache.org/licenses/LICENSE-2.0
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<resources>
+    <!-- Package name and fully-qualified class name for the wallpaper picker activity. -->
+    <string name="config_wallpaper_picker_package" translatable="false">com.android.wallpaper</string>
+    <string name="config_wallpaper_picker_class" translatable="false">com.android.customization.picker.CustomizationPickerActivity</string>
+
+    <!-- Fully-qualified class name for the styles & wallpaper picker activity. -->
+    <string name="config_styles_and_wallpaper_picker_class" translatable="false">com.android.customization.picker.CustomizationPickerActivity</string>
+</resources>

privapp-permissions-me.phh.treble.app.xml

@@ -1,8 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <permissions>
     <privapp-permissions package="me.phh.treble.app">
-        <permission name="android.permission.INTERACT_ACROSS_USERS"/>
+	    <permission name="android.permission.ACCESS_NETWORK_STATE"/>
+	    <permission name="android.permission.DIAGNOSTIC"/>
+	    <permission name="android.permission.INSTALL_PACKAGES"/>
+	    <permission name="android.permission.INTERACT_ACROSS_USERS"/>
+	    <permission name="android.permission.REQUEST_INSTALL_PACKAGES"/>
     </privapp-permissions>
+
     <!-- fix voice channels in calls (stop unloading treble-app) -->
     <allow-in-power-save package="me.phh.treble.app" />
 </permissions>

rw-system.sh

@@ -147,7 +147,7 @@ changeKeylayout() {
     fi
 
     if getprop ro.vendor.build.fingerprint | grep -iq \
-        -e poco/ -e redmi/ -e xiaomi/ ; then
+        -e poco/ -e POCO/ -e redmi/ -e xiaomi/ ; then
         if [ ! -f /mnt/phh/keylayout/uinput-goodix.kl ]; then
           cp /system/phh/empty /mnt/phh/keylayout/uinput-goodix.kl
           chmod 0644 /mnt/phh/keylayout/uinput-goodix.kl
@@ -392,9 +392,9 @@ if getprop ro.vendor.build.fingerprint | grep -iq \
     setprop persist.sys.qcom-brightness -1
 fi
 
-# Lenovo Z5s brightness flickers without this setting
+# Lenovo Z5s & Xiaomi Mi10TLite brightness flickers without this setting
 if getprop ro.vendor.build.fingerprint | grep -iq \
-    -e Lenovo/jd2019; then
+    -e Lenovo/jd2019 -e Xiaomi/gauguin -e Redmi/gauguin; then
     setprop persist.sys.qcom-brightness -1
 fi
 
@@ -424,7 +424,7 @@ if getprop ro.vendor.build.fingerprint | grep -q -i \
     -e xiaomi/nitrogen -e xiaomi/whyred -e xiaomi/platina \
     -e xiaomi/ysl -e nubia/nx60 -e nubia/nx61 -e xiaomi/tulip \
     -e xiaomi/lavender -e xiaomi/olive -e xiaomi/olivelite -e xiaomi/pine \
-    -e Redmi/lancelot -e Redmi/galahad; then
+    -e Redmi/lancelot -e Redmi/galahad -e POCO/evergreen; then
     setprop persist.sys.qcom-brightness "$(cat /sys/class/leds/lcd-backlight/max_brightness)"
 fi
 
@@ -457,7 +457,7 @@ if getprop ro.vendor.build.fingerprint | grep -iq \
     -e motorola/hannah -e motorola/james -e motorola/pettyl -e xiaomi/cepheus \
     -e xiaomi/grus -e xiaomi/cereus -e xiaomi/cactus -e xiaomi/raphael -e xiaomi/davinci \
     -e xiaomi/ginkgo -e xiaomi/willow -e xiaomi/laurel_sprout -e xiaomi/andromeda \
-    -e redmi/curtana -e redmi/picasso \
+    -e xiaomi/gauguin -e redmi/gauguin -e redmi/curtana -e redmi/picasso \
     -e bq/Aquaris_M10 ; then
     mount -o bind /mnt/phh/empty_dir /vendor/lib64/soundfx
     mount -o bind /mnt/phh/empty_dir /vendor/lib/soundfx
@@ -581,10 +581,17 @@ if getprop ro.vendor.build.fingerprint | grep -iq -e Redmi/merlin; then
     setprop debug.sf.enable_hwc_vds 0
 fi
 
+if getprop ro.vendor.build.fingerprint | grep -iq -e Redmi/lancelot; then
+    setprop debug.sf.enable_hwc_vds 1
+fi
+
 if getprop ro.vendor.build.fingerprint | grep -iq -e Redmi/rosemary \
     -e Redmi/secret -e Redmi/maltose; then
     setprop debug.sf.latch_unsignaled 1
     setprop debug.sf.enable_hwc_vds 0
+
+    # Exclude FP input devices
+    mount -o bind /system/phh/rosemary-excluded-input-devices.xml /system/etc/excluded-input-devices.xml
 fi
 
 if getprop ro.vendor.build.fingerprint | grep -iq -E -e 'huawei|honor' || getprop persist.sys.overlay.huawei | grep -iq -E -e 'true'; then
@@ -975,22 +982,39 @@ fi
 
 resetprop_phh ro.bluetooth.library_name libbluetooth.so
 
-if getprop ro.vendor.build.fingerprint |grep -iq xiaomi/cepheus -e xiaomi/nabu;then
-    setprop ro.netflix.bsp_rev Q855-16947-1
+board="$(getprop ro.board.platform)"
+
+if [ "$board" = atoll ] || [ "$board" = sm6250 ]; then
+	setprop ro.netflix.bsp_rev Q6250-19132-1
 fi
 
-if getprop ro.vendor.build.fingerprint |grep -iq xiaomi/elish;then
-    setprop ro.netflix.bsp_rev Q8250-19134-1
+if [ "$board" = msmnile ]; then
+	setprop ro.netflix.bsp_rev Q855-16947-1
 fi
 
-if getprop ro.vendor.build.fingerprint |grep -qi redmi/curtana;then
-    setprop ro.netflix.bsp_rev Q6250-19132-1
+if [ "$board" = sm6150 ]; then
+	setprop ro.netflix.bsp_rev Q6150-17263-1
 fi
 
-if getprop ro.vendor.build.fingerprint |grep -iq xiaomi/renoir;then
-    setprop ro.netflix.bsp_rev Q875-32774-1
-    resetprop_phh ro.config.media_vol_steps 25
-    resetprop_phh ro.config.media_vol_default 15
+if [ "$board" = mt6768 ]; then
+	setprop ro.netflix.bsp_rev MTK6768-19055-1
+fi
+
+if [ "$board" = lahaina ]; then
+	setprop ro.netflix.bsp_rev Q875-32774-1
+	resetprop_phh ro.config.media_vol_steps 25
+	resetprop_phh ro.config.media_vol_default 15
+fi
+
+if [ "$board" = universal8825 ];then
+	setprop ro.netflix.bsp_rev EXYNOS1280-34993-1
+fi
+
+if getprop ro.vendor.build.fingerprint |grep -qi Nokia/Phoenix;then
+    setprop ro.netflix.bsp_rev Q845-05000-1
+    setprop debug.sf.latch_unsignaled 1
+    setprop sys.use_fifo_ui 1
+    setprop media.settings.xml "/vendor/etc/media_profiles_vendor.xml"
 fi
 
 # Set props for Vsmart Live's fod

sepolicy/file_contexts

@@ -21,3 +21,4 @@
 /efs u:object_r:efs_file:s0
 
 /dev/smcinvoke u:object_r:smcinvoke_device:s0
+/system/bin/hw/android\.hardware\.bluetooth\.audio-service-system u:object_r:hal_audio_sysbta_exec:s0

sepolicy/hal_audio_sysbta.te

@@ -0,0 +1,10 @@
+type hal_audio_sysbta, domain, coredomain;
+hal_server_domain(hal_audio_sysbta, hal_audio)
+
+type hal_audio_sysbta_exec, exec_type, system_file_type, file_type;
+init_daemon_domain(hal_audio_sysbta)
+
+hal_client_domain(hal_audio_sysbta, hal_allocator)
+
+# allow audioserver to call hal_audio dump with its own fd to retrieve status
+allow hal_audio_sysbta audioserver:fifo_file write;

sepolicy/property_contexts

@@ -0,0 +1,2 @@
+persist.sys.sf.hs_mode         u:object_r:sf_hs_mode_prop:s0
+hwc.exynos.vsync_mode      u:object_r:vendor_hwc_prop:s0

sepolicy/samsung.te

@@ -2,3 +2,14 @@ type boot_prop, property_type;
 
 set_prop(system_server, boot_prop);
 
+type hal_graphics_composer_default, domain;
+
+type sf_hs_mode_prop, property_type;
+
+get_prop(hal_graphics_composer_default, sf_hs_mode_prop);
+
+type vendor_hwc_prop, property_type;
+
+get_prop(hal_graphics_composer_default, vendor_hwc_prop);
+
+

sepolicy/service_contexts

@@ -8,3 +8,6 @@ irit                                                 u:object_r:radio_service:s0
 # MTK IMS
 mwis                                    u:object_r:radio_service:s0
 mtkIms                                    u:object_r:radio_service:s0
+
+# Audio AIDL interface
+android.hardware.bluetooth.audio.IBluetoothAudioProviderFactory/sysbta    u:object_r:hal_audio_service:s0

system.prop

@@ -14,3 +14,22 @@ ro.boot.realme.lockstate=0
 
 #Fixes fingerprint unlock delay
 persist.wm.enable_remote_keyguard_animation=0
+
+# Enable system-side generic bluetooth audio HAL
+persist.bluetooth.system_audio_hal.enabled=1
+# Set commonly-supported Bluetooth profiles to enabled
+# TODO: Enable BLE Audio profiles on newer vendors
+bluetooth.profile.asha.central.enabled?=true
+bluetooth.profile.a2dp.source.enabled?=true
+bluetooth.profile.avrcp.target.enabled?=true
+bluetooth.profile.bas.client.enabled?=true
+bluetooth.profile.gatt.enabled?=true
+bluetooth.profile.hfp.ag.enabled?=true
+bluetooth.profile.hid.device.enabled?=true
+bluetooth.profile.hid.host.enabled?=true
+bluetooth.profile.map.server.enabled?=true
+bluetooth.profile.opp.enabled?=true
+bluetooth.profile.pan.nap.enabled?=true
+bluetooth.profile.pan.panu.enabled?=true
+bluetooth.profile.pbap.server.enabled?=true
+bluetooth.profile.sap.server.enabled?=true

vndk.rc

@@ -3,7 +3,6 @@ on post-fs
 	exec - root -- /system/bin/rw-system.sh
 	mount none /system/etc/usb_audio_policy_configuration.xml /vendor/etc/usb_audio_policy_configuration.xml bind
         setprop ro.vndk.version ${persist.sys.vndk}
-	export LD_PRELOAD :
 
 on property:vold.decrypt=trigger_restart_framework
 	exec - root -- /system/bin/phh-on-data.sh