axmol/cocos/audio/android/PcmAudioService.cpp

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Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#define LOG_TAG "PcmAudioService"

#include "audio/android/PcmAudioService.h"
#include "audio/android/AudioMixerController.h"

namespace cocos2d { namespace experimental {

static std::vector<char> __silenceData;

#define AUDIO_PLAYER_BUFFER_COUNT (2)

class SLPcmAudioPlayerCallbackProxy
{
public:
    static void samplePlayerCallback(SLAndroidSimpleBufferQueueItf bq, void *context)
    {
        PcmAudioService *thiz = reinterpret_cast<PcmAudioService *>(context);
        thiz->bqFetchBufferCallback(bq);
    }
};

PcmAudioService::PcmAudioService(SLEngineItf engineItf, SLObjectItf outputMixObject)
        : _engineItf(engineItf), _outputMixObj(outputMixObject), _playObj(nullptr),
          _playItf(nullptr), _volumeItf(nullptr), _bufferQueueItf(nullptr), _numChannels(-1),
          _sampleRate(-1), _bufferSizeInBytes(0), _controller(nullptr), _isInitialised(false)
{
}

PcmAudioService::~PcmAudioService()
{
    ALOGV("PcmAudioServicee() (%p), before destroy play object", this);
    SL_DESTROY_OBJ(_playObj);
    ALOGV("PcmAudioServicee() end");
}

bool PcmAudioService::enqueue()
{
    if (_controller->hasPlayingTacks())
    {
        if (_controller->isPaused())
        {
            SLresult r = (*_bufferQueueItf)->Enqueue(_bufferQueueItf, __silenceData.data(), __silenceData.size());
            SL_RETURN_VAL_IF_FAILED(r, false, "enqueue silent data failed!");
        }
        else
        {
            _controller->mixOneFrame();

            auto current = _controller->current();
            ALOG_ASSERT(current != nullptr, "current buffer is nullptr ...");
            SLresult r = (*_bufferQueueItf)->Enqueue(_bufferQueueItf, current->buf, current->size);
            SL_RETURN_VAL_IF_FAILED(r, false, "enqueue failed!");
        }
    }
    else
    {
        SLresult r = (*_bufferQueueItf)->Enqueue(_bufferQueueItf, __silenceData.data(), __silenceData.size());
        SL_RETURN_VAL_IF_FAILED(r, false, "enqueue silent data failed!");
    }

    return true;
}

void PcmAudioService::bqFetchBufferCallback(SLAndroidSimpleBufferQueueItf bq)
{
    // FIXME: PcmAudioService instance may be destroyed, we need to find a way to wait...
    // It's in sub thread
    enqueue();
}

bool PcmAudioService::init(AudioMixerController* controller, int numChannels, int sampleRate, int bufferSizeInBytes)
{
    _controller = controller;
    _numChannels = numChannels;
    _sampleRate = sampleRate;
    _bufferSizeInBytes = bufferSizeInBytes;

    SLuint32 channelMask = SL_SPEAKER_FRONT_CENTER;

    if (numChannels > 1)
    {
        channelMask = SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT;
    }

    SLDataFormat_PCM formatPcm = {
            SL_DATAFORMAT_PCM,
            (SLuint32) numChannels,
            (SLuint32) sampleRate * 1000,
            SL_PCMSAMPLEFORMAT_FIXED_16,
            SL_PCMSAMPLEFORMAT_FIXED_16,
            channelMask,
            SL_BYTEORDER_LITTLEENDIAN
    };

    SLDataLocator_AndroidSimpleBufferQueue locBufQueue = {
            SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE,
            AUDIO_PLAYER_BUFFER_COUNT
    };
    SLDataSource source = {&locBufQueue, &formatPcm};

    SLDataLocator_OutputMix locOutmix = {
            SL_DATALOCATOR_OUTPUTMIX,
            _outputMixObj
    };
    SLDataSink sink = {&locOutmix, nullptr};

    const SLInterfaceID ids[] = {
            SL_IID_PLAY,
            SL_IID_VOLUME,
            SL_IID_ANDROIDSIMPLEBUFFERQUEUE,
    };

    const SLboolean req[] = {
            SL_BOOLEAN_TRUE,
            SL_BOOLEAN_TRUE,
            SL_BOOLEAN_TRUE,
    };

    SLresult r;

    r = (*_engineItf)->CreateAudioPlayer(_engineItf, &_playObj, &source, &sink,
                                         sizeof(ids) / sizeof(ids[0]), ids, req);
    SL_RETURN_VAL_IF_FAILED(r, false, "CreateAudioPlayer failed");

    r = (*_playObj)->Realize(_playObj, SL_BOOLEAN_FALSE);
    SL_RETURN_VAL_IF_FAILED(r, false, "Realize failed");

    r = (*_playObj)->GetInterface(_playObj, SL_IID_PLAY, &_playItf);
    SL_RETURN_VAL_IF_FAILED(r, false, "GetInterface SL_IID_PLAY failed");

    r = (*_playObj)->GetInterface(_playObj, SL_IID_VOLUME, &_volumeItf);
    SL_RETURN_VAL_IF_FAILED(r, false, "GetInterface SL_IID_VOLUME failed");

    r = (*_playObj)->GetInterface(_playObj, SL_IID_ANDROIDSIMPLEBUFFERQUEUE, &_bufferQueueItf);
    SL_RETURN_VAL_IF_FAILED(r, false, "GetInterface SL_IID_ANDROIDSIMPLEBUFFERQUEUE failed");

    r = (*_bufferQueueItf)->RegisterCallback(_bufferQueueItf,
                                             SLPcmAudioPlayerCallbackProxy::samplePlayerCallback,
                                             this);
    SL_RETURN_VAL_IF_FAILED(r, false, "_bufferQueueItf RegisterCallback failed");

    if (__silenceData.empty())
    {
        __silenceData.resize(_numChannels * _bufferSizeInBytes, 0x00);
    }

    r = (*_bufferQueueItf)->Enqueue(_bufferQueueItf, __silenceData.data(), __silenceData.size());
    SL_RETURN_VAL_IF_FAILED(r, false, "_bufferQueueItf Enqueue failed");

    r = (*_playItf)->SetPlayState(_playItf, SL_PLAYSTATE_PLAYING);
    SL_RETURN_VAL_IF_FAILED(r, false, "SetPlayState failed");

    _isInitialised = true;
    return true;
}

void PcmAudioService::pause()
{
    if (_isInitialised)
    {
        SLresult r = (*_playItf)->SetPlayState(_playItf, SL_PLAYSTATE_PAUSED);
        SL_RETURN_IF_FAILED(r, "PcmAudioService::pause failed");
    }
}

void PcmAudioService::resume()
{
    if (_isInitialised)
    {
        SLresult r = (*_playItf)->SetPlayState(_playItf, SL_PLAYSTATE_PLAYING);
        SL_RETURN_IF_FAILED(r, "PcmAudioService::resume failed");
    }
}

}} // namespace cocos2d { namespace experimental {