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
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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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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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#ifndef _SIMPLE_AUDIO_ENGINE_H_
#define _SIMPLE_AUDIO_ENGINE_H_

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

namespace CocosDenshion {

class TypeInfo
{
public:
    virtual long getClassTypeInfo() = 0;
};

static inline unsigned int getHashCodeByString(const char *key)
{
	unsigned int len = strlen(key);
	const char *end=key+len;
	unsigned int hash;

	for (hash = 0; key < end; key++)
	{
		hash *= 16777619;
		hash ^= (unsigned int) (unsigned char) toupper(*key);
	}
	return (hash);
}

/**
@class          SimpleAudioEngine
@brief          offer a VERY simple interface to play background music & sound effect
*/

class EXPORT_DLL SimpleAudioEngine : public TypeInfo
{
public:
    SimpleAudioEngine();
    ~SimpleAudioEngine();

    virtual long getClassTypeInfo() {
        return getHashCodeByString(typeid(CocosDenshion::SimpleAudioEngine).name());
    }

    /**
    @brief Get the shared Engine object,it will new one when first time be called
    */
    static SimpleAudioEngine* sharedEngine();

    /**
    @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();

    /**
     @brief Preload background music
     @param pszFilePath The path of the background music file,or the FileName of T_SoundResInfo
     */
    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
    */
    void playBackgroundMusic(const char* pszFilePath, bool bLoop);
    void playBackgroundMusic(const char* pszFilePath) {
    	this->playBackgroundMusic(pszFilePath, false);
    }

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

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

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

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

    bool willPlayBackgroundMusic();

    /**
    @brief Whether the background music is playing
    @return If is playing return true,or return false
    */
    bool isBackgroundMusicPlaying();

    // properties
    /**
    @brief The volume of the background music max value is 1.0,the min value is 0.0
    */
    float getBackgroundMusicVolume();

    /**
    @brief set the volume of background music
    @param volume must be in 0.0~1.0
    */
    void setBackgroundMusicVolume(float volume);

    /**
    @brief The volume of the effects max value is 1.0,the min value is 0.0
    */
    float getEffectsVolume();

    /**
    @brief set the volume of sound effecs
    @param volume must be in 0.0~1.0
    */
    void setEffectsVolume(float volume);

    // for sound effects
    /**
    @brief Play sound effect
    @param pszFilePath The path of the effect file,or the FileName of T_SoundResInfo
    @param bLoop Whether to loop the effect playing, default value is false
    */
    unsigned int playEffect(const char* pszFilePath, bool bLoop) {
        return this->playEffect(pszFilePath, bLoop, 1.0, 0.0, 1.0);
    }

    unsigned int playEffect(const char* pszFilePath) {
        return this->playEffect(pszFilePath, false);
    }

    /**
    @brief Play sound effect  with a file path, pitch, pan and gain
    @param pszFilePath The path of the effect file,or the FileName of T_SoundResInfo
    @param bLoop Whether to loop the effect playing, default value is false
    @param pitch Frequency, normal value is 1.0. Will also change effect play time.
    @param pan   Stereo effect, in range [-1..1] where -1 enables only left channel.
    @param gain  Volume, normal value is 1. Works for range [0..1].

    @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.
    */
    unsigned int playEffect(const char* pszFilePath, bool bLoop,
                            float pitch, float pan, float gain);

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

    /**
    @brief Pause all playing sound effect
    @param nSoundId The return value of function playEffect
    */
    void pauseAllEffects();

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

    /**
    @brief Resume all playing sound effect
    @param nSoundId The return value of function playEffect
    */
    void resumeAllEffects();

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

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

    /**
    @brief          preload a compressed audio file
    @details        the compressed audio will be decode to wave, then write into an 
    internal buffer in SimpleaudioEngine
    */
    void preloadEffect(const char* pszFilePath);

    /**
    @brief          unload the preloaded effect from internal buffer
    @param[in]        pszFilePath        The path of the effect file,or the FileName of T_SoundResInfo
    */
    void unloadEffect(const char* pszFilePath);
};

} // end of namespace CocosDenshion

#endif // _SIMPLE_AUDIO_ENGINE_H_