978ccd40f9
On platform release T, the legacy `audio.a2dp.default` HAL no longer exists, and cannot be trivially restored for generic system-side A2DP audio support. Rather than trying to cling on to its existence (which does not even work anymore even if one did so), it is time to come up with a new solution. This commit introduces a system-side implementation of the generic bluetooth audio HAL. The HAL itself is modelled after the default bluetooth audio HAL, while substantial components of the default audio HAL are also included as it has to also implement the audio HAL interfaces. The audio HAL implementation is delegated to `audio.sysbta.default`, forked from `audio.bluetooth.default` from the Bluetooth apex package. It then communicates with the bluetooth audio HAL interfaces, which need to live in the same process (in this case, the process of the sysbta HAL). This is why we cannot just load `audio.sysbta.default` into the default audio HAL or the audioserver process directly, but rather have to include our own simplistic audio HAL implementation. For now, the audio HAL implementation only includes one for the 6.0 version, but technically, an interface for *every* audio HAL version needs to exist. This, along with other messiness in the sysbta implementation, will be addressed in a future commit. Note that to actually make use of the sysbta audio hal, patches in frameworks/av and packages/modules/Bluetooth are required to introduce support for the property `persist.bluetooth.system_audio_hal.enabled`.
112 lines
4.1 KiB
C++
112 lines
4.1 KiB
C++
/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "BTAudioProviderA2dpSW"
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#include "A2dpSoftwareAudioProvider.h"
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#include <BluetoothAudioCodecs.h>
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#include <BluetoothAudioSessionReport.h>
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#include <android-base/logging.h>
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namespace aidl {
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namespace android {
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namespace hardware {
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namespace bluetooth {
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namespace audio {
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// Here the buffer size is based on SBC
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static constexpr uint32_t kPcmFrameSize = 4; // 16 bits per sample / stereo
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// SBC is 128, and here we choose the LCM of 16, 24, and 32
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static constexpr uint32_t kPcmFrameCount = 96;
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static constexpr uint32_t kRtpFrameSize = kPcmFrameSize * kPcmFrameCount;
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// The max counts by 1 tick (20ms) for SBC is about 7. Since using 96 for the
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// PCM counts, here we just choose a greater number
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static constexpr uint32_t kRtpFrameCount = 10;
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static constexpr uint32_t kBufferSize = kRtpFrameSize * kRtpFrameCount;
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static constexpr uint32_t kBufferCount = 2; // double buffer
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static constexpr uint32_t kDataMqSize = kBufferSize * kBufferCount;
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A2dpSoftwareEncodingAudioProvider::A2dpSoftwareEncodingAudioProvider()
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: A2dpSoftwareAudioProvider() {
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session_type_ = SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH;
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}
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A2dpSoftwareDecodingAudioProvider::A2dpSoftwareDecodingAudioProvider()
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: A2dpSoftwareAudioProvider() {
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session_type_ = SessionType::A2DP_SOFTWARE_DECODING_DATAPATH;
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}
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A2dpSoftwareAudioProvider::A2dpSoftwareAudioProvider()
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: BluetoothAudioProvider(), data_mq_(nullptr) {
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LOG(INFO) << __func__ << " - size of audio buffer " << kDataMqSize
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<< " byte(s)";
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std::unique_ptr<DataMQ> data_mq(
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new DataMQ(kDataMqSize, /* EventFlag */ true));
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if (data_mq && data_mq->isValid()) {
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data_mq_ = std::move(data_mq);
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} else {
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ALOGE_IF(!data_mq, "failed to allocate data MQ");
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ALOGE_IF(data_mq && !data_mq->isValid(), "data MQ is invalid");
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}
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}
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bool A2dpSoftwareAudioProvider::isValid(const SessionType& sessionType) {
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return (sessionType == session_type_ && data_mq_ && data_mq_->isValid());
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}
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ndk::ScopedAStatus A2dpSoftwareAudioProvider::startSession(
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const std::shared_ptr<IBluetoothAudioPort>& host_if,
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const AudioConfiguration& audio_config,
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const std::vector<LatencyMode>& latency_modes, DataMQDesc* _aidl_return) {
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if (audio_config.getTag() != AudioConfiguration::pcmConfig) {
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LOG(WARNING) << __func__ << " - Invalid Audio Configuration="
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<< audio_config.toString();
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*_aidl_return = DataMQDesc();
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return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
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}
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const PcmConfiguration& pcm_config =
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audio_config.get<AudioConfiguration::pcmConfig>();
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if (!BluetoothAudioCodecs::IsSoftwarePcmConfigurationValid(pcm_config)) {
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LOG(WARNING) << __func__ << " - Unsupported PCM Configuration="
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<< pcm_config.toString();
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*_aidl_return = DataMQDesc();
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return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
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}
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return BluetoothAudioProvider::startSession(
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host_if, audio_config, latency_modes, _aidl_return);
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}
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ndk::ScopedAStatus A2dpSoftwareAudioProvider::onSessionReady(
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DataMQDesc* _aidl_return) {
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if (data_mq_ == nullptr || !data_mq_->isValid()) {
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*_aidl_return = DataMQDesc();
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return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
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}
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*_aidl_return = data_mq_->dupeDesc();
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auto desc = data_mq_->dupeDesc();
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BluetoothAudioSessionReport::OnSessionStarted(
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session_type_, stack_iface_, &desc, *audio_config_, latency_modes_);
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return ndk::ScopedAStatus::ok();
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}
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} // namespace audio
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} // namespace bluetooth
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} // namespace hardware
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} // namespace android
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} // namespace aidl
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