axmol/cocos/audio/include/AudioCache.h

/****************************************************************************
 Copyright (c) 2014-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2018-2020 simdsoft.com, @HALX99
 Copyright (c) 2021 Bytedance Inc.

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 of this software and associated documentation files (the "Software"), to deal
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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#pragma once

#include "platform/CCPlatformConfig.h"

#include <string>
#include <mutex>
#include <vector>
#include <memory>

#include "platform/CCPlatformMacros.h"
#include "audio/include/AudioMacros.h"
#include "audio/include/alconfig.h"

NS_CC_BEGIN

class AudioEngineImpl;
class AudioPlayer;

class CC_DLL AudioCache
{
public:
    enum class State
    {
        INITIAL,
        LOADING,
        READY,
        FAILED
    };

    AudioCache();
    ~AudioCache();

    void addPlayCallback(const std::function<void()>& callback);

    void addLoadCallback(const std::function<void(bool)>& callback);

protected:
    void setSkipReadDataTask(bool isSkip) { _isSkipReadDataTask = isSkip; };
    void readDataTask(unsigned int selfId);

    void invokingPlayCallbacks();

    void invokingLoadCallbacks();

    // pcm data related stuff
    ALenum _format;
    ALsizei _sampleRate;
    float _duration;
    uint32_t _totalFrames;
    uint32_t _framesRead;

    /*Cache related stuff;
     * Cache pcm data when sizeInBytes less than PCMDATA_CACHEMAXSIZE
     */
    ALuint _alBufferId;

    /*Queue buffer related stuff
     *  Streaming in OpenAL when sizeInBytes greater then PCMDATA_CACHEMAXSIZE
     */
    char* _queBuffers[QUEUEBUFFER_NUM];
    ALsizei _queBufferSize[QUEUEBUFFER_NUM];
    uint32_t _queBufferFrames;

    std::mutex _playCallbackMutex;
    std::vector<std::function<void()>> _playCallbacks;

    // loadCallbacks doesn't need mutex since it's invoked only in Cocos thread.
    std::vector<std::function<void(bool)>> _loadCallbacks;

    std::mutex _readDataTaskMutex;

    State _state;

    std::shared_ptr<bool> _isDestroyed;
    std::string _fileFullPath;
    unsigned int _id;
    bool _isLoadingFinished;
    bool _isSkipReadDataTask;

    friend class AudioEngineImpl;
    friend class AudioPlayer;
};

NS_CC_END