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`.
96 lines
3.3 KiB
C++
96 lines
3.3 KiB
C++
/*
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* Copyright 2018 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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#pragma once
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#include <android/hardware/bluetooth/audio/2.1/types.h>
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#include "BluetoothAudioSession.h"
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#include <mutex>
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#include <unordered_map>
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namespace android {
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namespace bluetooth {
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namespace audio {
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class BluetoothAudioSession_2_1 {
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private:
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std::shared_ptr<BluetoothAudioSession> audio_session;
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::android::hardware::bluetooth::audio::V2_1::SessionType session_type_2_1_;
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::android::hardware::bluetooth::audio::V2_1::SessionType raw_session_type_;
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// audio data configuration for both software and offloading
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::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
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audio_config_2_1_;
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bool UpdateAudioConfig(
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const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration&
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audio_config);
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static ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
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invalidSoftwareAudioConfiguration;
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static ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
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invalidOffloadAudioConfiguration;
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public:
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BluetoothAudioSession_2_1(
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const ::android::hardware::bluetooth::audio::V2_1::SessionType&
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session_type);
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std::shared_ptr<BluetoothAudioSession> GetAudioSession();
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// The report function is used to report that the Bluetooth stack has started
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// this session without any failure, and will invoke session_changed_cb_ to
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// notify those registered bluetooth_audio outputs
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void OnSessionStarted(
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const sp<IBluetoothAudioPort> stack_iface,
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const DataMQ::Descriptor* dataMQ,
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const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration&
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audio_config);
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// The control function is for the bluetooth_audio module to get the current
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// AudioConfiguration
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const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
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GetAudioConfig();
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static constexpr ::android::hardware::bluetooth::audio::V2_1::
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AudioConfiguration& kInvalidSoftwareAudioConfiguration =
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invalidSoftwareAudioConfiguration;
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static constexpr ::android::hardware::bluetooth::audio::V2_1::
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AudioConfiguration& kInvalidOffloadAudioConfiguration =
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invalidOffloadAudioConfiguration;
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};
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class BluetoothAudioSessionInstance_2_1 {
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public:
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// The API is to fetch the specified session of A2DP / Hearing Aid
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static std::shared_ptr<BluetoothAudioSession_2_1> GetSessionInstance(
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const ::android::hardware::bluetooth::audio::V2_1::SessionType&
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session_type);
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private:
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static std::unique_ptr<BluetoothAudioSessionInstance_2_1> instance_ptr;
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std::mutex mutex_;
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std::unordered_map<::android::hardware::bluetooth::audio::V2_1::SessionType,
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std::shared_ptr<BluetoothAudioSession_2_1>>
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sessions_map_;
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};
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} // namespace audio
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} // namespace bluetooth
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} // namespace android
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