rockbox

History

Nils Wallménius b086458e4e FS#12231 Centralize the selection of codec compilation flags to codec.make to avoid having to duplicate the per cpu selection logic and the build rule in the individual codec lib make files and make tweaking easier. The two special cases, libmad and libspeex were left alone. I plan to introduce a var for arm generation so that appropriate flags can be selected per generation as benchmarking results have shown that different arm arches might have different optimal flags. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30330 a1c6a512-1295-4272-9138-f99709370657		2011-08-18 16:33:41 +00:00
..
cook.c	Submit FS#12115: Use more IRAM in cook codec for several targets. Speeds up PP5022 and MCF5250 by ~3% and S5L87.0x by ~4%.	2011-05-22 19:03:58 +00:00
cook.h	Submit FS#12115: Use more IRAM in cook codec for several targets. Speeds up PP5022 and MCF5250 by ~3% and S5L87.0x by ~4%.	2011-05-22 19:03:58 +00:00
cook_fixpoint.h	FS#12146: Fix libcook bugs introduced in r22055 by Sean Bartell.	2011-06-05 13:12:51 +00:00
cookdata.h	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.	2009-05-10 22:26:02 +00:00
cookdata_fixpoint.h	Further work on cook codec. Rounding is not needed when using a large fract part in the internal sample representation. Move quantization array to iram. Beautification of mdct post processing. Speed up of 0.2 MHz on PP5022.	2010-02-21 21:18:05 +00:00
libcook.make	FS#12231	2011-08-18 16:33:41 +00:00
README.rockbox	Modify libcook to use rockbox's mdct library in its standalone test program.	2009-08-13 20:26:31 +00:00
SOURCES	Sync codeclib bitstream code with upstream ffmpeg code. Build ffmpeg_bitstream.c as a part of the codec lib. Use this codeclib implementation in libffmpegFLAC. Implement adapted version of the unaligned longword reading optimization for coldfire from the libwma version of this code. Speeds up cook decoding by 2-3% on h300 and flac by 25% on h300, also speeds up flac decoding by 2% on c200 (decoding speed of cook on c200 is unchanged).	2010-07-15 16:19:17 +00:00

README.rockbox

Library: libcook
Imported by : Mohamed Tarek

These files comprise a rm parser and a cook decoder based on the decoder
from ffmpeg.

LICENSING INFORMATION

ffmpeg is licensed under the Lesser GNU General Public License and the
file cook.c is Copyright 2003 Sascha Sommer and 2005 Benjamin Larsson.

IMPORT DETAILS

The decoder is based on ffmpeg-svn r18079.

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.

cook_fixp_mdct.h and parts from cookdata_fixpoint.h were dropped and
rockbox's mdct library is now used in both the test program and the 
real codec.

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
command "make -f Makefile.test".

For ARM targets add -DCPU_ARM to CFLAGS in Makefile.test to make use of 
the asm ARM optimisations in rockbox's mdct library.

For Big-endian targets, change -D"ROCKBOX_LITTLE_ENDIAN=1" 
to -D"ROCKBOX_BIG_ENDIAN=1" in Makefile.test.

Running "./cooktest file.rm" will decode the audio data to a WAV file
called "output.wav" in the current directory.