rockbox/apps/codecs/demac/libdemac/entropy.c, branch master

Add codecs to librbcodec.

2012-04-25T20:13:20+00:00

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

Fix #11897 - Multiple 'divide by zero' while playing particular APE on Clip+. Problem and solution observed and checked on Gigabeat S by myself. Fix submitted by Mikhail Titov resolves it. range_decode_short was declared as returing 'int short' rather than 'unsigned short' resulting in unwanted sign extension.

2011-02-05T09:59:36+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29208 a1c6a512-1295-4272-9138-f99709370657

Move (small) data into DRAM on PP5020, it's ~4.5% faster that way. Closes about half of the performance gap towards PP5022. The (relatively large) buffers for decoded data stay in IRAM, as does the reciprocal table. Clarify some comments.

2010-03-10T21:39:12+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25108 a1c6a512-1295-4272-9138-f99709370657

Fix decoding of stereo frames with silence in only one channel. * Make the standalone decoder contain debugging information.

2008-12-21T23:49:02+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19552 a1c6a512-1295-4272-9138-f99709370657

Get rid of unused return values, except the one from decode_chunk() which will be used in the dual core split.

2008-11-26T18:01:18+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19236 a1c6a512-1295-4272-9138-f99709370657

Branch optimisation in both C (giving hints to gcc - verified using -fprofile-arcs and gcov) and asm files. Biggest effect on coldfire (-c1000: +8%, -c2000: +5%), but ARM also profits a bit (less than 1% on ARM7TDMI, around 1% on ARM1136).

2008-11-24T18:40:49+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19199 a1c6a512-1295-4272-9138-f99709370657

Centralise compile-time configuration.

2008-11-16T17:49:37+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19121 a1c6a512-1295-4272-9138-f99709370657

Move the contents of rangecoding.h into entropy.c, and remove the former. It was only used there, and defined some variables in the .h

2008-11-16T12:58:15+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19116 a1c6a512-1295-4272-9138-f99709370657

Some entropy decoder tweaks. Also removed unnecessary 'tmp' variables.

2008-11-04T23:46:04+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19008 a1c6a512-1295-4272-9138-f99709370657

Various speedups: (1) Put actual decoding functions into IRAM on PP5002. (2) Put the insane filter buffer into IRAM on coldfire and PP502x (just for completeness, as long as there's no better use). (3) Use the ARMv6 'ssat' instruction for saturation on Gigabeat S.

2008-10-03T21:40:32+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18701 a1c6a512-1295-4272-9138-f99709370657