Commit Graph

12 Commits

Author SHA1 Message Date
Reimar Döffinger
7c93f2c0b9 Move cbrt tables to separate cbrt_data(_fixed).c files.
Allows sharing and reusing the data between different files.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
2016-03-13 18:15:57 +01:00
Ganesh Ajjanagadde
07a11ebcab lavc/cbrt_tablegen: speed up tablegen
This exploits an approach based on the sieve of Eratosthenes, a popular
method for generating prime numbers.

Tables are identical to previous ones.

Tested with FATE with/without --enable-hardcoded-tables.

Sample benchmark (Haswell, GNU/Linux+gcc):
prev:
7860100 decicycles in cbrt_tableinit,       1 runs,      0 skips
7777490 decicycles in cbrt_tableinit,       2 runs,      0 skips
[...]
7582339 decicycles in cbrt_tableinit,     256 runs,      0 skips
7563556 decicycles in cbrt_tableinit,     512 runs,      0 skips

new:
2099480 decicycles in cbrt_tableinit,       1 runs,      0 skips
2044470 decicycles in cbrt_tableinit,       2 runs,      0 skips
[...]
1796544 decicycles in cbrt_tableinit,     256 runs,      0 skips
1791631 decicycles in cbrt_tableinit,     512 runs,      0 skips

Both small and large run count given as this is called once so small run
count may give a better picture, small numbers are fairly consistent,
and there is a consistent downward trend from small to large runs,
at which point it stabilizes to a new value.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
2016-01-11 17:20:38 -05:00
Ganesh Ajjanagadde
2f5075f551 avcodec/cbrt_tablegen: speed up dynamic table creation
On systems having cbrt, there is no reason to use the slow pow function.

Sample benchmark (x86-64, Haswell, GNU/Linux):
new:
5124920 decicycles in cbrt_tableinit,       1 runs,      0 skips

old:
12321680 decicycles in cbrt_tableinit,       1 runs,      0 skips

Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
2015-12-01 19:05:19 -05:00
Nedeljko Babic
a9d986c2ce avcodec: Minor macro polishing
Use macros from aac_defines.h for adding suffixes
 instead of local macros.

Signed-off-by: Nedeljko Babic <nedeljko.babic@imgtec.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2015-07-22 23:23:29 +02:00
Jovan Zelincevic
08be74ac81 libavcodec: Implementation of AAC_fixed_decoder (LC-module) [2/4]
Add fixed point implementation of functions for generating tables

Signed-off-by: Nedeljko Babic <nedeljko.babic@imgtec.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-07-09 14:41:19 +02:00
Reimar Döffinger
03bf457241 Add av_cold to table generation functions.
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
2014-08-31 10:33:02 +02:00
Michael Niedermayer
59352a07d8 avcodec: improve precission for cbrtf() emulation
cbrtf() took floats but it represented 1/3 exactly
and even if not more precission should be better in theory
for the table generation

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-10-15 21:03:03 +02:00
Derek Buitenhuis
008014b5e7 tablegen: Don't use cbrtf in host tools
You cannot count on them being present on all systems, and you
cannot include libm.h in a host tool, so just hard code baseline
implementations.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
2013-10-15 16:52:07 +01:00
Michael Niedermayer
bf8bb94322 Merge remote-tracking branch 'qatar/master'
* qatar/master:
  ffmpeg: get rid of the -vglobal option.
  dct32: Add AVX implementation of 32-point DCT
  dct32: Change pass 6 permutation to allow for AVX implementation
  dct32: port SSE 32-point DCT to YASM
  multiple inclusion guard cleanup
  avio: document buffer must created with av_malloc() and friends
  avio: check AVIOContext malloc failure
  swscale: point out an alternative to sws_getContext
  svq3: Do initialization after parsing the extradata
  add changelog entries for 0.7_beta2
  mp3lame: add #include required for AV_RB32 macro.

Conflicts:
	Changelog
	libavcodec/svq3.c
	libavcodec/x86/dct32_sse.c
	libavfilter/vsrc_buffer.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2011-05-22 04:53:19 +02:00
Diego Biurrun
153382e1b6 multiple inclusion guard cleanup
Add missing multiple inclusion guards; clean up #endif comments;
add missing library prefixes; keep guard names consistent.
2011-05-21 13:48:10 +02:00
Mans Rullgard
2912e87a6c Replace FFmpeg with Libav in licence headers
Signed-off-by: Mans Rullgard <mans@mansr.com>
2011-03-19 13:33:20 +00:00
Reimar Döffinger
c26bce1070 Allow hard-coding of the 32kB cubic-root table for AAC.
Originally committed as revision 22527 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-14 19:59:47 +00:00