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Issues in ExtAudioFileSeek and ExtAudioFileTell

Hi All,

I would like to get some inputs on the issues that I am facing currently. Please correct me if I am doing something wrong as I am not expertise in this area.
I was trying to read mp3 audio data in chunk by chunk manner, for that I uses ExtAudioFileRead as I want the data in uncompressed format (16 bit, linear PCM).
For a specific .mp3 file (as of my test) i could see that  following results for the ExtAudioFileSeek and ExtAudioFileTell apis.



Sint64 theOffset = (primeOffset + 0); //it gives 576 
ExtAudioFileSeek(fileRef,theOffset);
ExtAudioFileTell(fileRef,&theOffset);   ///  theOffset gives 0

//read a sample frame of theNumPackets =  4096   
ExtAudioFileRead(filRef,& theNumPackets,&BufferList);   

ExtAudioFileTell(fileRef,&theOffset);   /// theOffset gives 4672  



Could anybody please tell me ,why first call to ExtAudioFileTell returns 0 and after reading it gives 4672 (i was expecting 4096)?
Also any more info about the behavior of ExtAudioFileSeek and ExtAudioFileTell apis are highly appreciated.











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