axmol/CocosDenshion/include/SimpleAudioEngine.h

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2010      Steve Oldmeadow

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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#ifndef _SIMPLE_AUDIO_ENGINE_H_
#define _SIMPLE_AUDIO_ENGINE_H_

#include <stddef.h>
#include "Export.h"
#include <typeinfo>
#include <ctype.h>
#include <string.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

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.
 */

class EXPORT_DLL SimpleAudioEngine
{
public:
    /**
     @brief Get the shared Engine object,it will new one when first time be called
     */
    static SimpleAudioEngine* getInstance();
    CC_DEPRECATED_ATTRIBUTE static SimpleAudioEngine* sharedEngine() { return SimpleAudioEngine::getInstance(); }

    /**
     @brief Release the shared Engine object
     @warning It must be called before the application exit, or a memroy leak will be casued.
     */
    static void end();

protected:
    SimpleAudioEngine();
    virtual ~SimpleAudioEngine();

public:

    /**
     @brief Preload background music
     @param pszFilePath The path of the background music file.
     */
    virtual void preloadBackgroundMusic(const char* pszFilePath);
    
    /**
    @brief Play background music
    @param pszFilePath The path of the background music file,or the FileName of T_SoundResInfo
    @param bLoop Whether the background music loop or not
    */
    virtual void playBackgroundMusic(const char* pszFilePath, bool bLoop = false);

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

    /**
    @brief Pause playing background music
     */
    virtual void pauseBackgroundMusic();

    /**
    @brief Resume playing background music
     */
    virtual void resumeBackgroundMusic();

    /**
    @brief Rewind playing background music
     */
    virtual void rewindBackgroundMusic();

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

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

    // 
    // properties
    //

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

    /**
    @brief 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.
    */
    virtual void setBackgroundMusicVolume(float volume);

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

    /**
    @brief 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

    /**
    @brief Play sound effect with a file path, pitch, pan and gain
    @param pszFilePath The path of the effect file.
    @param bLoop 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 OpenAL source 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 emscrippten, win32, marmalade.
    */
    virtual unsigned int playEffect(const char* pszFilePath, bool bLoop = false,
                                    float pitch = 1.0f, float pan = 0.0f, float gain = 1.0f);

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

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

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

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

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

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

    /**
    @brief          preload a compressed audio file
    @details        the compressed audio will be decoded to wave, then written into an internal buffer in SimpleAudioEngine
    @param pszFilePath The path of the effect file
    */
    virtual void preloadEffect(const char* pszFilePath);

    /**
    @brief          unload the preloaded effect from internal buffer
    @param pszFilePath        The path of the effect file
    */
    virtual void unloadEffect(const char* pszFilePath);
};

} // end of namespace CocosDenshion

#endif // _SIMPLE_AUDIO_ENGINE_H_