rockbox

History

Andree Buschmann 4b49ef2ade Another minor ARM speedup for libwmapro. Drop lsb of multiplication result in fixmul31(). The difference to current implementation is +/-1 in the output signal. Same routines are used for other codecs and in the codec lib as well. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27728 a1c6a512-1295-4272-9138-f99709370657		2010-08-05 21:59:29 +00:00
..
libwmapro.make	libwmapro: build with -O2 for coldfire, 5% speedup.	2010-07-27 06:48:15 +00:00
mdct_tables.c	oops ! shouldn't have removed mdct_tables.	2010-08-05 06:10:14 +00:00
mdct_tables.h	oops ! shouldn't have removed mdct_tables.	2010-08-05 06:10:14 +00:00
quant.h	Use higher precision for libwmapro's quant_tab[].	2010-08-01 22:02:57 +00:00
README.rockbox	update wmapro's README.	2010-08-05 06:37:53 +00:00
SOURCES	Fix reds.	2010-08-05 06:17:18 +00:00
wma.c	Use codeclib's mdct in wmapro. Input coeffs to the transform needed to be scaled down first by (log2(frame_size) - 3). Increases decoding speed by 1.3MHz on PP5022 and saves ~32KB that were previously needed by the mdct tables. (FS#11511 by Buschel and myself)	2010-08-04 22:29:50 +00:00
wma.h	Increase wmapro decoder output sample depth to 24 bits, makes the mean error between our output and the original floating point decoder ~5e-8. (FS#11498 by Buschel)	2010-08-04 23:21:35 +00:00
wmapro_math.h	Another minor ARM speedup for libwmapro. Drop lsb of multiplication result in fixmul31(). The difference to current implementation is +/-1 in the output signal. Same routines are used for other codecs and in the codec lib as well.	2010-08-05 21:59:29 +00:00
wmaprodata.h	Maintenance and minor speedup of libwmapro. Comment unused arrays, fix comment, remove tabs and introduce WMAPRO_FRACT to wma.h to remove magic numbers. Swap operands of fixmul16-call for minor speedup on ARM (+1%).	2010-07-29 22:18:04 +00:00
wmaprodec.c	Increase wmapro decoder output sample depth to 24 bits, makes the mean error between our output and the original floating point decoder ~5e-8. (FS#11498 by Buschel)	2010-08-04 23:21:35 +00:00
wmaprodec.h	Maintenance and minor speedup of libwmapro. Comment unused arrays, fix comment, remove tabs and introduce WMAPRO_FRACT to wma.h to remove magic numbers. Swap operands of fixmul16-call for minor speedup on ARM (+1%).	2010-07-29 22:18:04 +00:00

README.rockbox

Library: libwmapro
Imported: 2010-04-30 by Mohamed Tarek

This set of files form the files needed from ffmpeg's libavcodec and libavutil
to build a standalone wma professional decoder.

LICENSING INFORMATION

ffmpeg is licensed under the Lesser GNU General Public License and the file
wmaprodec.c is copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion
and copyright (c) 2008 - 2009 Sascha Sommer, Benjamin Larsson.

IMPORT DETAILS

Based on ffmpeg svn r22886 dated 15 April 2010.

The decoder is a heavily modified version of the original ffmpeg floating point
implementation. It's been modified to use fixed point arithmetic and now plays
and seeks on all the targets that Rockbox supports. Currently only supports mono
and stereo streams, streams with more than 2 channels are not yet supported.