Windows Media Audio Pro

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The next generation of Windows Media audio codecs.

Extra data layout

This is a rough guess of the extra data from the asf container (little endian order).

byte 1      Size of extradata
byte 3-4    Channel mask (http://msdn2.microsoft.com/en-us/library/ms790436.aspx)
byte 5-13   Unknown
byte 14-15  Mask used for calculating samples per frame
byte 16-18  Unknown