RedCore/cocos2d/cocos/audio/include/SimpleAudioEngine.h

/****************************************************************************
Copyright (c) 2010      Steve Oldmeadow
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2017 Chukong Technologies Inc.

http://www.cocos2d-x.org

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#ifndef _SIMPLE_AUDIO_ENGINE_H_
#define _SIMPLE_AUDIO_ENGINE_H_

#include "audio/include/Export.h"

#if defined(__GNUC__) && ((__GNUC__ >= 4) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)))
#define CC_DEPRECATED_ATTRIBUTE __attribute__((deprecated))
#elif _MSC_VER >= 1400 //vs 2005 or higher
#define CC_DEPRECATED_ATTRIBUTE __declspec(deprecated)
#else
#define CC_DEPRECATED_ATTRIBUTE
#endif

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

namespace CocosDenshion {

/**
 * @class SimpleAudioEngine
 *
 * @brief Offers a very simple interface to play background music & sound effects.
 *
 * @note Make sure to call SimpleAudioEngine::end() when the sound engine is not needed anymore to release allocated resources.
 * @js cc.audioEngine
 */

class EXPORT_DLL SimpleAudioEngine
{
public:
    /**
     * Returns a shared instance of the SimpleAudioEngine.
     * @js NA
     */
    static SimpleAudioEngine* getInstance();

    /**
     * @deprecated Use `getInstance` instead.
     * @js NA
     * @lua NA
     */
    CC_DEPRECATED_ATTRIBUTE static SimpleAudioEngine* sharedEngine() { return SimpleAudioEngine::getInstance(); }

    /**
     * Release the shared Engine object.
     *
     * @warning It must be called before the application exit, or it will lead to memory leaks.
     * @lua destroyInstance
     */
    static void end();

    /**
     * Preload background music.
     *
     * @param filePath The path of the background music file.
     * @js NA
     * @lua preloadMusic
     */
    virtual void preloadBackgroundMusic(const char* filePath);
    
    /**
     * Play background music.
     * 
     * @param filePath The path of the background music file,or the FileName of T_SoundResInfo.
     * @param loop Whether the background music loop or not.
     * @js playMusic
     * @lua playMusic
     */
    virtual void playBackgroundMusic(const char* filePath, bool loop = false);

    /**
     * Stop playing background music.
     *
     * @param releaseData If release the background music data or not.As default value is false.
     * @js stopMusic
     * @lua stopMusic
     */
    virtual void stopBackgroundMusic(bool releaseData = false);

    /**
     * Pause playing background music.
     * @js pauseMusic
     * @lua pauseMusic
     */
    virtual void pauseBackgroundMusic();

    /**
     * Resume playing background music.
     * @js resumeMusic
     * @lua resumeMusic
     */
    virtual void resumeBackgroundMusic();

    /**
     * Rewind playing background music.
     * @js rewindMusic
     * @lua rewindMusic
     */
    virtual void rewindBackgroundMusic();

    /**
     * Indicates whether any background music can be played or not.
     *
     * @return <i>true</i> if background music can be played, otherwise <i>false</i>.
     * @js willPlayMusic
     * @lua willPlayMusic
     */
    virtual bool willPlayBackgroundMusic();

    /**
     * Indicates whether the background music is playing.
     *
     * @return <i>true</i> if the background music is playing, otherwise <i>false</i>.
     * @js isMusicPlaying
     * @lua isMusicPlaying
     */
    virtual bool isBackgroundMusicPlaying();

    // 
    // properties
    //

    /**
     * The volume of the background music within the range of 0.0 as the minimum and 1.0 as the maximum.
     * @js getMusicVolume
     * @lua getMusicVolume
     */
    virtual float getBackgroundMusicVolume();

    /**
     * Set the volume of background music.
     *
     * @param volume must be within the range of 0.0 as the minimum and 1.0 as the maximum.
     * @js setMusicVolume
     * @lua setMusicVolume
     */
    virtual void setBackgroundMusicVolume(float volume);

    /**
     * The volume of the effects within the range of 0.0 as the minimum and 1.0 as the maximum.
     */
    virtual float getEffectsVolume();

    /**
     * Set the volume of sound effects.
     *
     * @param volume must be within the range of 0.0 as the minimum and 1.0 as the maximum.
     */
    virtual void setEffectsVolume(float volume);

    // 
    // for sound effects

    /**
     * Play sound effect with a file path, pitch, pan and gain.
     *
     * @param filePath The path of the effect file.
     * @param loop Determines whether to loop the effect playing or not. The default value is false.
     * @param pitch Frequency, normal value is 1.0. Will also change effect play time.
     * @param pan   Stereo effect, in the range of [-1..1] where -1 enables only left channel.
     * @param gain  Volume, in the range of [0..1]. The normal value is 1.
     * @return The sound id.
     * 
     * @note Full support is under development, now there are limitations:
     *     - no pitch effect on Samsung Galaxy S2 with OpenSL backend enabled;
     *     - no pitch/pan/gain on win32.
     */
    virtual unsigned int playEffect(const char* filePath, bool loop = false,
                                    float pitch = 1.0f, float pan = 0.0f, float gain = 1.0f);

    /**
     * Pause playing sound effect.
     *
     * @param soundId The return value of function playEffect.
     */
    virtual void pauseEffect(unsigned int soundId);

    /**
     * Pause all playing sound effect.
     */
    virtual void pauseAllEffects();

    /**
     * Resume playing sound effect.
     *
     * @param soundId The return value of function playEffect.
     */
    virtual void resumeEffect(unsigned int soundId);

    /**
     * Resume all playing sound effect.
     */
    virtual void resumeAllEffects();

    /**
     * Stop playing sound effect.
     *
     * @param soundId The return value of function playEffect.
     */
    virtual void stopEffect(unsigned int soundId);

    /**
     * Stop all playing sound effects.
     */
    virtual void stopAllEffects();

    /**
     * Preload a compressed audio file.
     *
     * The compressed audio will be decoded to wave, then written into an internal buffer in SimpleAudioEngine.
     *
     * @param filePath The path of the effect file.
     * @js NA
     */
    virtual void preloadEffect(const char* filePath);

    /**
     * Unload the preloaded effect from internal buffer.
     *
     * @param filePath The path of the effect file.
     */
    virtual void unloadEffect(const char* filePath);

protected:
    /**
    * Constructor of SimpleAudioEngine.
    */
    SimpleAudioEngine();

    /**
    * Destructor of SimpleAudioEngine.
    */
    virtual ~SimpleAudioEngine();
};

} // end of namespace CocosDenshion

// end audio group
/// @}

#endif // _SIMPLE_AUDIO_ENGINE_H_