| /* |
| * 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 |