cocos支持的音效格式：

支持的音乐格式
Android mp3, mid, ogg, wav 可以播放android.media.MediaPlayer所支持的所有格式
iOS aac, caf, mp3, m4a, wav 可以播放AVAudioPlayer所支持的所有格式
Windows mid, mp3, wav 无
支持的音效格式
Android ogg, wav 对wav的支持不完美
iOS caf, m4a 可以播放Cocos2d-iPhone CocosDesion所支持的所有格式
Windows mid, wav 无

一、预加载

加载音乐和音效通常是个耗时间的过程，为了防止由加载产生的延时导致实际播放与游戏播放不协调的现象，在播放音乐和音效前，可以预加载音乐文件。

  2. class EXPORT_DLL SimpleAudioEngine
  3. {
  4.     virtual void preloadBackgroundMusic(const char* filePath);
  6.     // Preload a compressed audio file.
  7.     // The compressed audio will be decoded to wave, then written into 
  8.     // an internal buffer in SimpleAudioEngine.
  9.     virtual void preloadEffect(const char* filePath);
  11.     // Unload the preloaded effect from internal buffer.
  12.     virtual void unloadEffect(const char* filePath);
  13. }

使用示例：

  2. #include "SimpleAudioEngine.h"
  3. using namespace CocosDenshion;
  5. auto audio = SimpleAudioEngine::getInstance();
  7. // pre-loading background music and effects. You could pre-load
  8. // effects, perhaps on app startup so they are already loaded
  9. // when you want to use them.
  10. audio->preloadBackgroundMusic("myMusic1.mp3");
  11. audio->preloadBackgroundMusic("myMusic2.mp3");
  13. audio->preloadEffect("myEffect1.mp3");
  14. audio->preloadEffect("myEffect2.mp3");
  16. // unload a sound from cache. If you are finished with a sound and
  17. // you wont use it anymore in your game. unload it to free up resources.
  18. audio->unloadEffect("myEffect1.mp3");

二、播放控制

  2. class EXPORT_DLL SimpleAudioEngine
  3. {
  4.     // 播放音乐
  5.     // filePath:    path of the background music file,or the FileName of T_SoundResInfo.
  6.     virtual void playBackgroundMusic(const char* filePath, bool loop = false);
  8.     // 重头放
  9.     virtual void rewindBackgroundMusic();
  11.     // 播放音效，返回 sound id。有以下支持限制：
  12.     //         - no pitch effect on Samsung Galaxy S2 with OpenSL backend enabled;
  13.     //         - no pitch/pan/gain on win32.
  14.     virtual unsigned int playEffect(const char* filePath, 
  15.                                     bool  loop  = false,
  16.                                     float pitch = 1.0f,     // 频率
  17.                                     float pan   = 0.0f,     // 立体音效，-1.0 ~ 1.0，-1.0左声道
  18.                                     float gain  = 1.0f);    // 音量，0.0 ~ 1.0
  20.     // 停止播放，soundId失效，cache还在，需要unload
  21.     virtual void stopBackgroundMusic(bool releaseData = false);
  22.     virtual void stopEffect(unsigned int soundId);
  23.     virtual void stopAllEffects();
  25.     // 暂停播放
  26.     virtual void pauseEffect(unsigned int soundId);
  27.     virtual void pauseAllEffects();
  28.     virtual void pauseBackgroundMusic();
  30.     // 恢复播放
  31.     virtual void resumeEffect(unsigned int soundId);
  32.     virtual void resumeAllEffects();
  33.     virtual void resumeBackgroundMusic();
  35.     // 音量控制，0.0 <= volume <= 1.0
  36.     virtual void setBackgroundMusicVolume(float volume);
  37.     virtual void setEffectsVolume(float volume);
  38. }