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Patch by Mohamed Tarek from FS#10182 - convert codec to fixed-point using patches submitted to the ffmpeg mailing list in 2007 by Ian Braithwaite.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20901 a1c6a512-1295-4272-9138-f99709370657
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Dave Chapman 2009-05-10 22:26:02 +00:00
parent 3a0a9915eb
commit fc28cb4ed5
7 changed files with 1313 additions and 123 deletions
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18
apps/codecs/libcook/README.rockbox
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@ -31,6 +31,24 @@ compile cook.c and the related files outside ffmpeg.
The decoder still uses floating point and relies on dynamic allocations
in some parts of it. It's still not ready to be ported to rockbox.
CONVERSION TO FIXED-POINT
A patch from ffmpeg's mailing list was used to convert the decoder to
use fixed-point arithmetic. The patch was done by Ian Braithwaite, and
discussed here :
http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/46024
The patch is a bit dated (2007) so the modifications to cook.c had to
be done manually. The patch was also applied to cookdata.h and was
used to create cookdata_fixpoint.h, cook_fixpoint.h and
cook_fixp_mdct.h.
The patch used a cook_random() function for noise filling. this was
dropped and av_lfg_get() was used instead for consistency.
Note : Only parts of the patch were committed to ffmpeg's repository.
TESTING
The test program should compile in any Unix-like environment using the