f40bfc9267
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
47 lines
1.5 KiB
Text
47 lines
1.5 KiB
Text
Library: libcook
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Imported by : Mohamed Tarek
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These files comprise a rm parser and a cook decoder based on the decoder
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from ffmpeg.
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LICENSING INFORMATION
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ffmpeg is licensed under the Lesser GNU General Public License and the
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file cook.c is Copyright 2003 Sascha Sommer and 2005 Benjamin Larsson.
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IMPORT DETAILS
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The decoder is based on ffmpeg-svn r18079.
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CONVERSION TO FIXED-POINT
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A patch from ffmpeg's mailing list was used to convert the decoder to
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use fixed-point arithmetic. The patch was done by Ian Braithwaite, and
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discussed here :
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http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/46024
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The patch is a bit dated (2007) so the modifications to cook.c had to
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be done manually. The patch was also applied to cookdata.h and was
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used to create cookdata_fixpoint.h, cook_fixpoint.h and
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cook_fixp_mdct.h.
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cook_fixp_mdct.h and parts from cookdata_fixpoint.h were dropped and
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rockbox's mdct library is now used in both the test program and the
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real codec.
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Note : Only parts of the patch were committed to ffmpeg's repository.
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TESTING
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The test program should compile in any Unix-like environment using the
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command "make -f Makefile.test".
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For ARM targets add -DCPU_ARM to CFLAGS in Makefile.test to make use of
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the asm ARM optimisations in rockbox's mdct library.
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For Big-endian targets, change -D"ROCKBOX_LITTLE_ENDIAN=1"
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to -D"ROCKBOX_BIG_ENDIAN=1" in Makefile.test.
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Running "./cooktest file.rm" will decode the audio data to a WAV file
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called "output.wav" in the current directory.
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