rockbox

History

Nils Wallménius 6087d89603 libatrac: Coldfire asm for atrac3_iqmf_dewindowing, speeds up decoding of my atrac3 rm file by 45%. Based on preliminary patch by Andree Buschmann git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27578 a1c6a512-1295-4272-9138-f99709370657		2010-07-26 17:22:35 +00:00
..
atrac3.c	libatrac: Coldfire asm for atrac3_iqmf_dewindowing, speeds up decoding of my atrac3 rm file by 45%. Based on preliminary patch by Andree Buschmann	2010-07-26 17:22:35 +00:00
atrac3.h	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
atrac3_arm.S	Make sure files which aren't windows-specific use \n line endings only	2010-06-17 16:59:51 +00:00
atrac3data.h	Further optimization and minor clean up of atrac codec: Unroll iqmf_dewindowing for non-ARM speeds up decoder by +10% on H300. Removed some non-used arrays. Codec is still not fully realtime on Coldfire targets.	2010-02-14 14:38:18 +00:00
atrac3data_fixed.h	Reinstate ICONST_ATTR for matrixCoeffs_fix ; remove (silly) gain_tab1 and replace with a simple bitshift in the code	2010-02-20 12:55:35 +00:00
fixp_math.h	Small changes to asm for better readability.	2010-05-29 14:56:25 +00:00
libatrac.make	Support for playback of atrac3 audio in rm, in sim.	2009-08-14 17:36:57 +00:00
main.c	Move c/h files implementing/defining standard library stuff into a new libc directory, also standard'ify some parts of the code base (almost entirely #include fixes).	2010-05-06 21:04:40 +00:00
Makefile.test	Put QMF coefficients into IRAM. Update test program to still compile with IBSS_ATTR defined.	2009-08-16 04:05:40 +00:00
README.rockbox	Correct the ffmpeg revision of libatrac and write more import details.	2009-08-15 09:44:39 +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: libatrac
Imported by : Mohamed Tarek
Import date : 10-August-2009

LICENSING INFORMATION

ffmpeg is licensed under the Lesser GNU General Public License.

IMPORT DETAILS

The decoder is based on ffmpeg-svn r18110 : Mar 21 2009.
Some changes were done on in order to use static VLC tables
according to this commit :
http://git.ffmpeg.org/?p=ffmpeg;a=commit;h=4c20cf13a166577d93f5b2b0abb4609c60104d33

The decoder had been modified to use fixed-point arithmetic.

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