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5.1 AC-3 WAVs recognized as 2 channels?

Hello all,

I recently downloaded a 5.1 AC-3 sample WAV from http:// www.kellyindustries.com/sounds.html

Background: Opening the file with QuickTime Player results in static- the file is shown as stereo. However, VLC correctly opens and plays the file.

If I open the file with ExtAudioFileOpen(), and then get information using ExtAudioFileGetProperty(), the resulting AudioStreamBasicDescription is filled in with 44.1 kHz, 2-channel audio at 16 bits per sample. Obviously any operations performed on the 5.1 file treating it as 2 channels result in audio garbage (I primarily want to convert to FLAC).

The WAVE header looks like (starting at the 'fmt ' chunk): 66 6D 74 20 10 00 00 00 01 00 02 00 44 AC 00 00 10 B1 02 00 04 00 10 00. With this header, the Core Audio interpretation seems to be correct- the header implies 2-channel audio (I referred to the WAVE header info at http://ccrma.stanford.edu/courses/422/projects/WaveFormat/).

I couldn't find any information on 5.1 WAVE format, but assuming the same as regular WAVE, I am stumped how this file plays correctly in VLC but generates static in QuickTime Plyaer. Have I done something wrong or does Core Audio not support this type of WAV?

Thanks,
Stephen
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