/*
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* Copyright 2019 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 <time.h>
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#include <mutex>
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#include <android/hardware/bluetooth/audio/2.0/IBluetoothAudioProvider.h>
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#include <android/hardware/bluetooth/audio/2.0/types.h>
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#include <fmq/MessageQueue.h>
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#include <hardware/audio.h>
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#include "common/message_loop_thread.h"
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#define BLUETOOTH_AUDIO_HAL_PROP_DISABLED "persist.bluetooth.bluetooth_audio_hal.disabled"
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namespace bluetooth {
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namespace audio {
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using ::android::hardware::bluetooth::audio::V2_0::AudioCapabilities;
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using ::android::hardware::bluetooth::audio::V2_0::AudioConfiguration;
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using ::android::hardware::bluetooth::audio::V2_0::BitsPerSample;
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using ::android::hardware::bluetooth::audio::V2_0::ChannelMode;
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using ::android::hardware::bluetooth::audio::V2_0::CodecConfiguration;
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using ::android::hardware::bluetooth::audio::V2_0::CodecType;
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using ::android::hardware::bluetooth::audio::V2_0::IBluetoothAudioProvider;
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using ::android::hardware::bluetooth::audio::V2_0::PcmParameters;
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using ::android::hardware::bluetooth::audio::V2_0::SampleRate;
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using ::android::hardware::bluetooth::audio::V2_0::SessionType;
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using ::android::hardware::bluetooth::audio::V2_0::TimeSpec;
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using BluetoothAudioStatus =
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::android::hardware::bluetooth::audio::V2_0::Status;
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enum class BluetoothAudioCtrlAck : uint8_t {
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SUCCESS_FINISHED = 0,
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PENDING,
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FAILURE_UNSUPPORTED,
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FAILURE_BUSY,
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FAILURE_DISCONNECTING,
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FAILURE
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};
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std::ostream& operator<<(std::ostream& os, const BluetoothAudioCtrlAck& ack);
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inline BluetoothAudioStatus BluetoothAudioCtrlAckToHalStatus(
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const BluetoothAudioCtrlAck& ack) {
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switch (ack) {
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case BluetoothAudioCtrlAck::SUCCESS_FINISHED:
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return BluetoothAudioStatus::SUCCESS;
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case BluetoothAudioCtrlAck::FAILURE_UNSUPPORTED:
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return BluetoothAudioStatus::UNSUPPORTED_CODEC_CONFIGURATION;
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case BluetoothAudioCtrlAck::PENDING:
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return BluetoothAudioStatus::FAILURE;
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case BluetoothAudioCtrlAck::FAILURE_BUSY:
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return BluetoothAudioStatus::FAILURE;
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case BluetoothAudioCtrlAck::FAILURE_DISCONNECTING:
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return BluetoothAudioStatus::FAILURE;
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default:
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return BluetoothAudioStatus::FAILURE;
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}
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}
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// An IBluetoothTransportInstance needs to be implemented by a Bluetooth audio
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// transport, such as A2DP or Hearing Aid, to handle callbacks from Audio HAL.
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class IBluetoothTransportInstance {
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public:
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IBluetoothTransportInstance(SessionType sessionType,
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AudioConfiguration audioConfig)
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: session_type_(sessionType), audio_config_(std::move(audioConfig)){};
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virtual ~IBluetoothTransportInstance() = default;
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SessionType GetSessionType() const { return session_type_; }
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AudioConfiguration GetAudioConfiguration() const { return audio_config_; }
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void UpdateAudioConfiguration(const AudioConfiguration& audio_config) {
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audio_config_ = audio_config;
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}
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virtual BluetoothAudioCtrlAck StartRequest() = 0;
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virtual BluetoothAudioCtrlAck SuspendRequest() = 0;
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virtual void StopRequest() = 0;
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virtual bool GetPresentationPosition(uint64_t* remote_delay_report_ns,
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uint64_t* total_bytes_readed,
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timespec* data_position) = 0;
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virtual void MetadataChanged(const source_metadata_t& source_metadata) = 0;
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// Invoked when the transport is requested to reset presentation position
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virtual void ResetPresentationPosition() = 0;
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// Invoked when the transport is requested to log bytes read
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virtual void LogBytesRead(size_t bytes_readed) = 0;
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private:
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const SessionType session_type_;
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AudioConfiguration audio_config_;
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};
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// common object is shared between different kind of SessionType
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class BluetoothAudioDeathRecipient;
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// The client interface connects an IBluetoothTransportInstance to
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// IBluetoothAudioProvider and helps to route callbacks to
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// IBluetoothTransportInstance
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class BluetoothAudioClientInterface {
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public:
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// Constructs an BluetoothAudioClientInterface to communicate to
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// BluetoothAudio HAL. |sink| is the implementation for the transport, and
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// |message_loop| is the thread where callbacks are invoked.
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BluetoothAudioClientInterface(
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IBluetoothTransportInstance* sink,
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bluetooth::common::MessageLoopThread* message_loop);
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~BluetoothAudioClientInterface();
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bool IsValid() const {
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return provider_ != nullptr;
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}
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std::vector<AudioCapabilities> GetAudioCapabilities() const;
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bool UpdateAudioConfig(const AudioConfiguration& audioConfig);
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int StartSession();
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void StreamStarted(const BluetoothAudioCtrlAck& ack);
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void StreamSuspended(const BluetoothAudioCtrlAck& ack);
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int EndSession();
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// Read data from audio HAL through fmq
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size_t ReadAudioData(uint8_t* p_buf, uint32_t len);
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// Write data to audio HAL through fmq
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size_t WriteAudioData(uint8_t* p_buf, uint32_t len);
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// Renew the connection and usually is used when HIDL restarted
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void RenewAudioProviderAndSession();
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static constexpr PcmParameters kInvalidPcmConfiguration = {
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.sampleRate = SampleRate::RATE_UNKNOWN,
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.bitsPerSample = BitsPerSample::BITS_UNKNOWN,
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.channelMode = ChannelMode::UNKNOWN};
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private:
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// Helper function to connect to an IBluetoothAudioProvider
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void fetch_audio_provider();
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mutable std::mutex internal_mutex_;
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IBluetoothTransportInstance* sink_;
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android::sp<IBluetoothAudioProvider> provider_;
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std::vector<AudioCapabilities> capabilities_;
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bool session_started_;
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std::unique_ptr<::android::hardware::MessageQueue<
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uint8_t, ::android::hardware::kSynchronizedReadWrite>>
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mDataMQ;
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android::sp<BluetoothAudioDeathRecipient> death_recipient_;
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};
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} // namespace audio
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} // namespace bluetooth
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