| 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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