[FFmpeg-devel] [PATCH] handle WavPack stream version 0x410

[David Bryant]

Hi,

This patch updates the WavPack decoder to handle version 0x410 streams. 
These are created using the --optimize-mono switch with the command-line 
encoder. Essentially, these streams can have individual blocks encoded 
as mono data when the left and right channels of the source file are 
identical. This ends up saving significant space over encoding them as 
stereo because of a limitation in the entropy encoder (it can't 
efficiently encode runs of zeros that occur in only one channel).

This has been tested using the appropriate 16-bit stereo file from the 
WavPack test suite (which fails currently with an error):

test suite URL: http://www.rarewares.org/wavpack/test_suite.zip
file: test_suite/special_cases/false_stereo.wv

The FFmpeg WavPack decoder should now correctly decode all lossless 
16-bit stereo and mono streams.

Thanks in advance,

David

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