rockbox/apps/codecs/Tremor/mdct.c, branch master

Combine the Vorbis, WMA and AAC IMDCT functions and put them into the codeclib. Combined IMDCT is now based on existing Tremor transform. Reduces CPU for 192k AAC by 21MHz on Coldfire, and 5MHz on PP5024. WMA and Vorbis should have no functional changes since they already used this code. Further optimization is possible and would benefit all 3 codecs.

2008-09-04T18:02:10+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18412 a1c6a512-1295-4272-9138-f99709370657

Vorbis codec: Only try to put the ARM assembler optimised MDCT in IRAM if the target uses IRAM. This fixes the code for gigabeat, but it is kept disabled for gigabeat because the C code is actually slightly faster (~0.5%).

2008-01-25T18:52:15+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16164 a1c6a512-1295-4272-9138-f99709370657

disable the ARM optimized MDCT for the Gigabeat for now as it creates a data abort

2007-10-01T13:42:03+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14940 a1c6a512-1295-4272-9138-f99709370657

FS #7833: Optimizations to the Vorbis codec:

2007-09-27T21:58:51+00:00

- ARM assembly version of parts of mdct,
- special case for vorbis_book_decodevv_add for 2 channels and even book->dim,
- store the output in vb->pcm if possible, as it is usually in IRAM as
  opposed to v->pcm.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14875 a1c6a512-1295-4272-9138-f99709370657

Added macros controlling what goes to IRAM on different targets.

2006-11-09T21:59:27+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11483 a1c6a512-1295-4272-9138-f99709370657

Vorbis optimizations from Brandon Low (part of patch 1387611). Reduces cpu boost ratio on a test track by about 6 percentage points. Also fixes broken simulator playback caused by my previous Tremor commit.

2005-12-28T20:42:24+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8291 a1c6a512-1295-4272-9138-f99709370657

Introduced usage of IBSS_ATTR and ICONST_ATTR in codec libraries.

2005-10-27T11:39:01+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7660 a1c6a512-1295-4272-9138-f99709370657

Tweaked IRAM usage in the Vorbis codec. Speeds up decoding by about 10% on a couple of test files.

2005-07-28T12:04:41+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7249 a1c6a512-1295-4272-9138-f99709370657

A little improvement on Vorbis block synthesis.

2005-06-10T22:34:57+00:00

Added myself to the list of contributors.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6664 a1c6a512-1295-4272-9138-f99709370657

Vorbis opts: keep floor1 lookup table in IRAM.

2005-06-08T13:09:30+00:00

Slightly faster 16-bit clipping function.
Misc: changed tabs for spaces to conform with Rockbox coding standards.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6608 a1c6a512-1295-4272-9138-f99709370657