Add codecs to librbcodec.

Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>

lib/rbcodec/codecs/libcook/README.rockbox

@@ -0,0 +1,47 @@
+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.