RedCore/cocos2d/cocos/audio/android/AudioDecoderSLES.h

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#pragma once

#include "audio/android/AudioDecoder.h"
#include <mutex>
#include <condition_variable>

namespace cocos2d { namespace experimental {

class AudioDecoderSLES : public AudioDecoder
{
protected:
    AudioDecoderSLES();
    virtual ~AudioDecoderSLES();

    bool init(SLEngineItf engineItf, const std::string &url, int bufferSizeInFrames, int sampleRate, const FdGetterCallback &fdGetterCallback);
    virtual bool decodeToPcm() override;

private:
    void queryAudioInfo();

    void signalEos();
    void decodeToPcmCallback(SLAndroidSimpleBufferQueueItf queueItf);
    void prefetchCallback(SLPrefetchStatusItf caller, SLuint32 event);
    void decodeProgressCallback(SLPlayItf caller, SLuint32 event);

    SLEngineItf _engineItf;
    SLObjectItf _playObj;
    /* Local storage for decoded audio data */
    char* _pcmData;

    /* we only want to query / display the PCM format once */
    bool _formatQueried;
    /* Used to signal prefetching failures */
    bool _prefetchError;

    /* to display the number of decode iterations */
    int _counter;

    /* metadata key index for the PCM format information we want to retrieve */
    int _numChannelsKeyIndex;
    int _sampleRateKeyIndex;
    int _bitsPerSampleKeyIndex;
    int _containerSizeKeyIndex;
    int _channelMaskKeyIndex;
    int _endiannessKeyIndex;

    /* to signal to the test app the end of the stream to decode has been reached */
    bool _eos;
    std::mutex _eosLock;
    std::condition_variable _eosCondition;

    /* Structure for passing information to callback function */
    typedef struct CallbackCntxt_
    {
        SLPlayItf playItf;
        SLMetadataExtractionItf metaItf;
        SLuint32 size;
        SLint8 *pDataBase;    // Base address of local audio data storage
        SLint8 *pData;        // Current address of local audio data storage
    } CallbackCntxt;

    CallbackCntxt _decContext;
    int _bufferSizeInFrames;
    int _assetFd;
    FdGetterCallback _fdGetterCallback;
    bool _isDecodingCallbackInvoked;

    friend class SLAudioDecoderCallbackProxy;
    friend class AudioDecoderProvider;
};

}} // namespace cocos2d { namespace experimental {