India/cocos2d-x/cocos/audio/include/AudioEngine.h

/****************************************************************************
 Copyright (c) 2014-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 http://www.cocos2d-x.org

 Permission is hereby granted, free of charge, to any person obtaining a copy
 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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#pragma once

#include "platform/CCPlatformConfig.h"
#include "platform/CCPlatformMacros.h"
#include "audio/include/Export.h"

#include <functional>
#include <list>
#include <string>
#include <unordered_map>

#ifdef ERROR
#undef ERROR
#endif // ERROR

/**
 * @addtogroup audio
 * @{
 */

NS_CC_BEGIN
namespace experimental {

/**
 * @class AudioProfile
 *
 * @brief
 * @js NA
 */
class EXPORT_DLL AudioProfile
{
public:
    //Profile name can't be empty.
    std::string name;
    //The maximum number of simultaneous audio instance.
    unsigned int maxInstances;
    
    /* Minimum delay in between sounds */
    double minDelay;
    
    /**
     * Default constructor
     *
     * @lua new
     */
    AudioProfile()
    : maxInstances(0)
    , minDelay(0.0)
    {
        
    }
};

class AudioEngineImpl;

/**
 * @class AudioEngine
 *
 * @brief Offers a interface to play audio.
 *
 * @note Make sure to call AudioEngine::end() when the audio engine is not needed anymore to release resources.
 * @js NA
 */

class EXPORT_DLL AudioEngine
{
public:
    /** AudioState enum,all possible states of an audio instance.*/
    enum class AudioState
    {
        ERROR  = -1,
        INITIALIZING,
        PLAYING,
        PAUSED
    };
    
    static const int INVALID_AUDIO_ID;

    static const float TIME_UNKNOWN;

    static bool lazyInit();

    /**
     * Release objects relating to AudioEngine.
     *
     * @warning It must be called before the application exit.
     * @lua endToLua
     */
    static void end();
    
    /**  
     * Gets the default profile of audio instances.
     *
     * @return The default profile of audio instances.
     */
    static AudioProfile* getDefaultProfile();
    
    /** 
     * Play 2d sound.
     *
     * @param filePath The path of an audio file.
     * @param loop Whether audio instance loop or not.
     * @param volume Volume value (range from 0.0 to 1.0).
     * @param profile A profile for audio instance. When profile is not specified, default profile will be used.
     * @return An audio ID. It allows you to dynamically change the behavior of an audio instance on the fly.
     *
     * @see `AudioProfile`
     */
    static int play2d(const std::string& filePath, bool loop = false, float volume = 1.0f, const AudioProfile *profile = nullptr);
    
    /** 
     * Sets whether an audio instance loop or not.
     *
     * @param audioID An audioID returned by the play2d function.
     * @param loop Whether audio instance loop or not.
     */
    static void setLoop(int audioID, bool loop);

    /** 
     * Checks whether an audio instance is loop.
     *
     * @param audioID An audioID returned by the play2d function.
     * @return Whether or not an audio instance is loop.
     */
    static bool isLoop(int audioID);

    /** 
     * Sets volume for an audio instance.
     *
     * @param audioID An audioID returned by the play2d function.
     * @param volume Volume value (range from 0.0 to 1.0).
     */
    static void setVolume(int audioID, float volume);

    /** 
     * Gets the volume value of an audio instance.
     *
     * @param audioID An audioID returned by the play2d function.
     * @return Volume value (range from 0.0 to 1.0).
     */
    static float getVolume(int audioID);

    /** 
     * Pause an audio instance.
     *
     * @param audioID An audioID returned by the play2d function.
     */
    static void pause(int audioID);

    /** Pause all playing audio instances. */
    static void pauseAll();

    /** 
     * Resume an audio instance.
     *
     * @param audioID An audioID returned by the play2d function.
     */
    static void resume(int audioID);

    /** Resume all suspended audio instances. */
    static void resumeAll();

    /** 
     * Stop an audio instance.
     *
     * @param audioID An audioID returned by the play2d function.
     */
    static void stop(int audioID);

    /** Stop all audio instances. */
    static void stopAll();

    /**
     * Sets the current playback position of an audio instance.
     *
     * @param audioID   An audioID returned by the play2d function.
     * @param sec       The offset in seconds from the start to seek to.
     * @return 
     */
    static bool setCurrentTime(int audioID, float sec);

    /** 
     * Gets the current playback position of an audio instance.
     *
     * @param audioID An audioID returned by the play2d function.
     * @return The current playback position of an audio instance.
     */
    static float getCurrentTime(int audioID);

    /** 
     * Gets the duration of an audio instance.
     *
     * @param audioID An audioID returned by the play2d function.
     * @return The duration of an audio instance.
     */
    static float getDuration(int audioID);

    /** 
     * Returns the state of an audio instance.
     *
     * @param audioID An audioID returned by the play2d function.
     * @return The status of an audio instance.
     */
    static AudioState getState(int audioID);

    /** 
     * Register a callback to be invoked when an audio instance has completed playing.
     *
     * @param audioID An audioID returned by the play2d function.
     * @param callback
     */
    static void setFinishCallback(int audioID, const std::function<void(int,const std::string&)>& callback);
    
    /**
     * Gets the maximum number of simultaneous audio instance of AudioEngine.
     */
    static int getMaxAudioInstance() {return _maxInstances;}
    
    /**
     * Sets the maximum number of simultaneous audio instance for AudioEngine.
     *
     * @param maxInstances The maximum number of simultaneous audio instance.
     */
    static bool setMaxAudioInstance(int maxInstances);
    
    /** 
     * Uncache the audio data from internal buffer.
     * AudioEngine cache audio data on ios,mac, and win32 platform.
     *
     * @warning This can lead to stop related audio first.
     * @param filePath Audio file path.
     */
    static void uncache(const std::string& filePath);
    
    /** 
     * Uncache all audio data from internal buffer.
     *
     * @warning All audio will be stopped first.
     */
    static void uncacheAll();
    
    /**  
     * Gets the audio profile by id of audio instance.
     *
     * @param audioID An audioID returned by the play2d function.
     * @return The audio profile.
     */
    static AudioProfile* getProfile(int audioID);

    /**  
     * Gets an audio profile by name.
     *
     * @param profileName A name of audio profile.
     * @return The audio profile.
     */
    static AudioProfile* getProfile(const std::string &profileName);

    /**
     * Preload audio file.
     * @param filePath The file path of an audio.
     */
    static void preload(const std::string& filePath) { preload(filePath, nullptr); }

    /**
     * Preload audio file.
     * @param filePath The file path of an audio.
     * @param callback A callback which will be called after loading is finished.
     */
    static void preload(const std::string& filePath, std::function<void(bool isSuccess)> callback);

    /**
     * Gets playing audio count.
     */
    static int getPlayingAudioCount();
    
    /**
     * Whether to enable playing audios
     * @note If it's disabled, current playing audios will be stopped and the later 'preload', 'play2d' methods will take no effects.
     */
    static void setEnabled(bool isEnabled);
    /**
     * Check whether AudioEngine is enabled.
     */
    static bool isEnabled();
    
protected:
    static void addTask(const std::function<void()>& task);
    static void remove(int audioID);
    
    struct ProfileHelper
    {
        AudioProfile profile;

        std::list<int> audioIDs;

        double lastPlayTime;

        ProfileHelper()
            : lastPlayTime(0.0)
        {

        }
    };
    
    struct AudioInfo
    {
        const std::string* filePath;
        ProfileHelper* profileHelper;
        
        float volume;
        bool loop;
        float duration;
        AudioState state;

        AudioInfo();
        ~AudioInfo();
    private:
        AudioInfo(const AudioInfo& info);
        AudioInfo(AudioInfo&& info);
        AudioInfo& operator=(const AudioInfo& info);
        AudioInfo& operator=(AudioInfo&& info);
    };

    //audioID,audioAttribute
    static std::unordered_map<int, AudioInfo> _audioIDInfoMap;
    
    //audio file path,audio IDs
    static std::unordered_map<std::string,std::list<int>> _audioPathIDMap;
    
    //profileName,ProfileHelper
    static std::unordered_map<std::string, ProfileHelper> _audioPathProfileHelperMap;
    
    static unsigned int _maxInstances;
    
    static ProfileHelper* _defaultProfileHelper;
    
    static AudioEngineImpl* _audioEngineImpl;

    class AudioEngineThreadPool;
    static AudioEngineThreadPool* s_threadPool;
    
    static bool _isEnabled;
    
    friend class AudioEngineImpl;
};

} // namespace experimental {
NS_CC_END

// end group
/// @}