text: /****************************************************************************
   Copyright (c) 2014 Chukong Technologies Inc.
  
   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
   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   copies of the Software, and to permit persons to whom the Software is
   furnished to do so, subject to the following conditions:
  
   The above copyright notice and this permission notice shall be included in
   all copies or substantial portions of the Software.
  
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   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.
   ****************************************************************************/
  
  #include "platform/CCPlatformConfig.h"
  #if CC_TARGET_PLATFORM == CC_PLATFORM_IOS || CC_TARGET_PLATFORM == CC_PLATFORM_MAC
  
  #ifndef __AUDIO_CACHE_H_
  #define __AUDIO_CACHE_H_
  
  #import <OpenAL/al.h>
  #import <AudioToolbox/AudioToolbox.h>
  
  #include <string>
  #include <mutex>
  #include <vector>
  
  #include "CCPlatformMacros.h"
  
  #define QUEUEBUFFER_NUM 3
  #define QUEUEBUFFER_TIME_STEP 0.1
  
  NS_CC_BEGIN
  namespace experimental{
  
  class AudioEngineImpl;
  class AudioPlayer;
  
  class AudioCache{
  public:
      AudioCache();
      ~AudioCache();
  
      void addCallbacks(const std::function<void()> &callback);
      
  private:
      
      void readDataTask();
      
      void invokingCallbacks();
      
      //pcm data related stuff
      ALsizei _dataSize;
      ALenum _format;
      ALsizei _sampleRate;
      float _duration;
      int _bytesPerFrame;
      AudioStreamBasicDescription outputFormat;
      
      /*Cache related stuff;
       * Cache pcm data when sizeInBytes less than PCMDATA_CACHEMAXSIZE
       */
      ALuint _alBufferId;
      char* _pcmData;
      SInt64 _bytesOfRead;
  
      /*Queue buffer related stuff
       *  Streaming in openal when sizeInBytes greater then PCMDATA_CACHEMAXSIZE
       */
      char* _queBuffers[QUEUEBUFFER_NUM];
      ALsizei _queBufferSize[QUEUEBUFFER_NUM];
      UInt32 _queBufferFrames;
      UInt32 _queBufferBytes;
  
      bool _alBufferReady;
      std::mutex _callbackMutex;
      
      std::vector< std::function<void()> > _callbacks;
      std::mutex _readDataTaskMutex;
      
      bool _exitReadDataTask;
      std::string _fileFullPath;
      
      friend class AudioEngineImpl;
      friend class AudioPlayer;
  } ;
  
  }
  NS_CC_END
  
  #endif // __AUDIO_CACHE_H_
  #endif
  
  