audio_framework
├── frameworks
│ ├── js                          #js 接口
│ │ └── napi
│ │     └── audio_renderer      #audio_renderer NAPI接口
│ │       ├── include
│ │       │ ├── audio_renderer_callback_napi.h
│ │       │ ├── renderer_data_request_callback_napi.h
│ │       │ ├── renderer_period_position_callback_napi.h
│ │       │ └── renderer_position_callback_napi.h
│ │       └── src
│ │           ├── audio_renderer_callback_napi.cpp
│ │           ├── audio_renderer_napi.cpp
│ │           ├── renderer_data_request_callback_napi.cpp
│ │           ├── renderer_period_position_callback_napi.cpp
│ │           └── renderer_position_callback_napi.cpp
│ └── native                      #native 接口
│     └── audiorenderer
│       ├── BUILD.gn
│       ├── include
│       │ ├── audio_renderer_private.h
│       │ └── audio_renderer_proxy_obj.h
│       ├── src
│       │ ├── audio_renderer.cpp
│       │ └── audio_renderer_proxy_obj.cpp
│       └── test
│           └── example
│               └── audio_renderer_test.cpp
├── interfaces
│ ├── inner_api                   #native實現的接口
│ │ └── native
│ │     └── audiorenderer       #audio渲染本地實現的接口定義
│ │       └── include
│ │           └── audio_renderer.h
│ └── kits                        #js調用的接口
│     └── js
│         └── audio_renderer      #audio渲染NAPI接口的定義
│           └── include
│               └── audio_renderer_napi.h
└── services                        #服務端
  └── audio_service
      ├── BUILD.gn
      ├── client                  #IPC調用中的proxy端
      │ ├── include
      │ │ ├── audio_manager_proxy.h
      │ │ ├── audio_service_client.h
      │ └── src
      │     ├── audio_manager_proxy.cpp
      │     ├── audio_service_client.cpp
      └── server                  #IPC調用中的server端
        ├── include
        │ └── audio_server.h
        └── src
            ├── audio_manager_stub.cpp
└──audio_server.cpp

bool TestPlayback(int argc, char *argv[]) const
{
        FILE* wavFile = fopen(path, "rb");
        //讀取wav文件頭信息
        size_t bytesRead = fread(&wavHeader, 1, headerSize, wavFile);


        //設置AudioRenderer參數
        AudioRendererOptions rendererOptions = {};
        rendererOptions.streamInfo.encoding = AudioEncodingType::ENCODING_PCM;
        rendererOptions.streamInfo.samplingRate = static_cast(wavHeader.SamplesPerSec);
        rendererOptions.streamInfo.format = GetSampleFormat(wavHeader.bitsPerSample);
        rendererOptions.streamInfo.channels = static_cast(wavHeader.NumOfChan);
        rendererOptions.rendererInfo.contentType = contentType;
        rendererOptions.rendererInfo.streamUsage = streamUsage;
        rendererOptions.rendererInfo.rendererFlags = 0;


        //創建AudioRender實例
        unique_ptr audioRenderer = AudioRenderer::Create(rendererOptions);


        shared_ptr cb1 = make_shared();
        //設置音頻渲染回調
        ret = audioRenderer->SetRendererCallback(cb1);


        //InitRender方法主要調用了audioRenderer實例的Start方法，啟動音頻渲染
        if (!InitRender(audioRenderer)) {
            AUDIO_ERR_LOG("AudioRendererTest: Init render failed");
            fclose(wavFile);
            return false;
        }


        //StartRender方法主要是讀取wavFile文件的數據，然后通過調用audioRenderer實例的Write方法進行播放
        if (!StartRender(audioRenderer, wavFile)) {
            AUDIO_ERR_LOG("AudioRendererTest: Start render failed");
            fclose(wavFile);
            return false;
        }


        //停止渲染
        if (!audioRenderer->Stop()) {
            AUDIO_ERR_LOG("AudioRendererTest: Stop failed");
        }


        //釋放渲染
        if (!audioRenderer->Release()) {
            AUDIO_ERR_LOG("AudioRendererTest: Release failed");
        }


        //關閉wavFile
        fclose(wavFile);
        return true;
}

std::unique_ptr AudioRenderer::Create(const std::string cachePath,
    const AudioRendererOptions &rendererOptions, const AppInfo &appInfo)
{
    ContentType contentType = rendererOptions.rendererInfo.contentType;
    
    StreamUsage streamUsage = rendererOptions.rendererInfo.streamUsage;
   
    AudioStreamType audioStreamType = AudioStream::GetStreamType(contentType, streamUsage);
    auto audioRenderer = std::make_unique(audioStreamType, appInfo);
    if (!cachePath.empty()) {
        AUDIO_DEBUG_LOG("Set application cache path");
        audioRenderer->SetApplicationCachePath(cachePath);
    }


    audioRenderer->rendererInfo_.contentType = contentType;
    audioRenderer->rendererInfo_.streamUsage = streamUsage;
    audioRenderer->rendererInfo_.rendererFlags = rendererOptions.rendererInfo.rendererFlags;


    AudioRendererParams params;
    params.sampleFormat = rendererOptions.streamInfo.format;
    params.sampleRate = rendererOptions.streamInfo.samplingRate;
    params.channelCount = rendererOptions.streamInfo.channels;
    params.encodingType = rendererOptions.streamInfo.encoding;


    if (audioRenderer->SetParams(params) != SUCCESS) {
        AUDIO_ERR_LOG("SetParams failed in renderer");
        audioRenderer = nullptr;
        return nullptr;
    }


    return audioRenderer;
}

int32_t AudioRendererPrivate::SetRendererCallback(const std::shared_ptr &callback)
{
    RendererState state = GetStatus();
    if (state == RENDERER_NEW || state == RENDERER_RELEASED) {
        return ERR_ILLEGAL_STATE;
    }
    if (callback == nullptr) {
        return ERR_INVALID_PARAM;
    }


    // Save reference for interrupt callback
    if (audioInterruptCallback_ == nullptr) {
        return ERROR;
    }
    std::shared_ptr cbInterrupt =
        std::static_pointer_cast(audioInterruptCallback_);
    cbInterrupt->SaveCallback(callback);


    // Save and Set reference for stream callback. Order is important here.
    if (audioStreamCallback_ == nullptr) {
        audioStreamCallback_ = std::make_shared();
        if (audioStreamCallback_ == nullptr) {
            return ERROR;
        }
    }
    std::shared_ptr cbStream =
std::static_pointer_cast(audioStreamCallback_);
    cbStream->SaveCallback(callback);
    (void)audioStream_->SetStreamCallback(audioStreamCallback_);


    return SUCCESS;
}

bool AudioRendererPrivate::Start(StateChangeCmdType cmdType) const
{
    AUDIO_INFO_LOG("AudioRenderer::Start");
    RendererState state = GetStatus();


    AudioInterrupt audioInterrupt;
    switch (mode_) {
        case InterruptMode:
            audioInterrupt = sharedInterrupt_;
            break;
        case InterruptMode:
            audioInterrupt = audioInterrupt_;
            break;
        default:
            break;
    }
    AUDIO_INFO_LOG("AudioRenderer: %{public}d, streamType: %{public}d, sessionID: %{public}d",
        mode_, audioInterrupt.streamType, audioInterrupt.sessionID);


    if (audioInterrupt.streamType == STREAM_DEFAULT || audioInterrupt.sessionID == INVALID_SESSION_ID) {
        return false;
    }


    int32_t ret = AudioPolicyManager::GetInstance().ActivateAudioInterrupt(audioInterrupt);
    if (ret != 0) {
        AUDIO_ERR_LOG("AudioRendererPrivate::ActivateAudioInterrupt Failed");
        return false;
    }


    return audioStream_->StartAudioStream(cmdType);
}

bool AudioStream::StartAudioStream(StateChangeCmdType cmdType)
{
    int32_t ret = StartStream(cmdType);


    resetTime_ = true;
    int32_t retCode = clock_gettime(CLOCK_MONOTONIC, &baseTimestamp_);


    if (renderMode_ == RENDER_MODE_CALLBACK) {
        isReadyToWrite_ = true;
        writeThread_ = std::make_unique<std::thread>(&AudioStream::WriteCbTheadLoop, this);
    } else if (captureMode_ == CAPTURE_MODE_CALLBACK) {
        isReadyToRead_ = true;
        readThread_ = std::make_unique<std::thread>(&AudioStream::ReadCbThreadLoop, this);
    }


    isFirstRead_ = true;
    isFirstWrite_ = true;
    state_ = RUNNING;
    AUDIO_INFO_LOG("StartAudioStream SUCCESS");


    if (audioStreamTracker_) {
        AUDIO_DEBUG_LOG("AudioStream:Calling Update tracker for Running");
        audioStreamTracker_->UpdateTracker(sessionId_, state_, rendererInfo_, capturerInfo_);
    }
    return true;
}

int32_t AudioServiceClient::StartStream(StateChangeCmdType cmdType)
{
    int error;
    lock_guard lockdata(dataMutex);
    pa_operation *operation = nullptr;


    pa_threaded_mainloop_lock(mainLoop);


    pa_stream_state_t state = pa_stream_get_state(paStream);


    streamCmdStatus = 0;
    stateChangeCmdType_ = cmdType;
    operation = pa_stream_cork(paStream, 0, PAStreamStartSuccessCb, (void *)this);


    while (pa_operation_get_state(operation) == PA_OPERATION_RUNNING) {
        pa_threaded_mainloop_wait(mainLoop);
    }
    pa_operation_unref(operation);
    pa_threaded_mainloop_unlock(mainLoop);


    if (!streamCmdStatus) {
        AUDIO_ERR_LOG("Stream Start Failed");
        ResetPAAudioClient();
        return AUDIO_CLIENT_START_STREAM_ERR;
    } else {
        AUDIO_INFO_LOG("Stream Started Successfully");
        return AUDIO_CLIENT_SUCCESS;
    }
}

int32_t AudioRendererPrivate::Write(uint8_t *buffer, size_t bufferSize)
{
    return audioStream_->Write(buffer, bufferSize);
}

size_t AudioStream::Write(uint8_t *buffer, size_t buffer_size)
{
    int32_t writeError;
    StreamBuffer stream;
    stream.buffer = buffer;
    stream.bufferLen = buffer_size;
    isWriteInProgress_ = true;


    if (isFirstWrite_) {
        if (RenderPrebuf(stream.bufferLen)) {
            return ERR_WRITE_FAILED;
        }
        isFirstWrite_ = false;
    }


    size_t bytesWritten = WriteStream(stream, writeError);
    isWriteInProgress_ = false;
    if (writeError != 0) {
        AUDIO_ERR_LOG("WriteStream fail,writeError:%{public}d", writeError);
        return ERR_WRITE_FAILED;
    }
    return bytesWritten;
}

size_t AudioServiceClient::WriteStream(const StreamBuffer &stream, int32_t &pError)
{
   
    size_t cachedLen = WriteToAudioCache(stream);
    if (!acache.isFull) {
        pError = error;
        return cachedLen;
    }


    pa_threaded_mainloop_lock(mainLoop);




    const uint8_t *buffer = acache.buffer.get();
    size_t length = acache.totalCacheSize;


    error = PaWriteStream(buffer, length);
    acache.readIndex += acache.totalCacheSize;
    acache.isFull = false;


    if (!error && (length >= 0) && !acache.isFull) {
        uint8_t *cacheBuffer = acache.buffer.get();
        uint32_t offset = acache.readIndex;
        uint32_t size = (acache.writeIndex - acache.readIndex);
        if (size > 0) {
            if (memcpy_s(cacheBuffer, acache.totalCacheSize, cacheBuffer + offset, size)) {
                AUDIO_ERR_LOG("Update cache failed");
                pa_threaded_mainloop_unlock(mainLoop);
                pError = AUDIO_CLIENT_WRITE_STREAM_ERR;
                return cachedLen;
            }
            AUDIO_INFO_LOG("rearranging the audio cache");
        }
        acache.readIndex = 0;
        acache.writeIndex = 0;


        if (cachedLen < stream.bufferLen) {
            StreamBuffer str;
            str.buffer = stream.buffer + cachedLen;
            str.bufferLen = stream.bufferLen - cachedLen;
            AUDIO_DEBUG_LOG("writing pending data to audio cache: %{public}d", str.bufferLen);
            cachedLen += WriteToAudioCache(str);
        }
    }


    pa_threaded_mainloop_unlock(mainLoop);
    pError = error;
    return cachedLen;
}