I'm developing an iPhone app that uses the Extended Audio File Services. I try to use ExtAudioFileRead to read the audio file, and store the data in an AudioBufferList structure.

AudioBufferList is defined as:

struct AudioBufferList {
UInt32      mNumberBuffers;
AudioBuffer mBuffers[1];
};
typedef struct AudioBufferList  AudioBufferList;

and AudioBuffer is defined as

struct AudioBuffer {
   UInt32  mNumberChannels;
   UInt32  mDataByteSize;
   void*   mData;
};
typedef struct AudioBuffer  AudioBuffer;

I want to manipulate the mData but I wonder what does the void* mean. Why is it void*? How can I decide what data type is actually stored in mData?