FFmpeg

Commit Graph

Author	SHA1	Message	Date
Andreas Rheinhardt	d5d1c697bd	avcodec/mpegaudio_tablegen: Make exponential LUT shared Both the fixed as well as the floating point mpegaudio decoders use LUTs of type int8_t and uint32_t with 32K entries each; these tables are completely the same, yet they are not shared. This commit makes them shared. When both fixed as well as floating point decoders are enabled, this saves 160KiB from the bss segment for a normal build (translating into 160KiB less memory usage if both a shared as well as a floating point decoder have actually been used) and 160KiB from the binary for a build with hardcoded tables. It also means that the code to create said LUTs is no longer duplicated (for a normal build). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>	4 years ago
Andreas Rheinhardt	22140374c8	avcodec/mpegaudio_tablegen: Avoid write-only buffers The mpegaudio_tablegen header contains code to initialize several tables; it is included in both the fixed as well as the floating point mpegaudio decoders and some of these tables are only used by the fixed resp. floating point decoders; yet both types are always initialized, leaving the compiler to figure out that one of them is unused. GCC 9.3 fails at this (even with -O3): $ readelf -s mpegaudiodec_fixed.o\|grep _float 28: 0000000000001660 32768 OBJECT LOCAL DEFAULT 4 expval_table_float An actually unused table (expval_table_fixed/float) of size 32KiB is kept and initialized (the reason for this is probably that this table is read from, namely to initialize another table: exp_table_fixed/float; of course the float resp. fixed tables are not used in the fixed resp. floating point decoder). Therefore #ifdef the unneeded tables away. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>	4 years ago
Hendrik Leppkes	42a9aead85	avcodec: include tablegen compat header before the tablegen functionality	9 years ago
Ganesh Ajjanagadde	16d4c28cbb	avcodec/mpegaudio_tablegen: speed up dynamic table creation This does some miscellaneous stuff mainly avoiding the usage of pow to achieve significant speedups. This is not speed critical, but is unnecessary latency and cycles wasted for a user. All tables tested and are identical to the old ones (bit-exact even in floating point case). Sample benchmark (x86-64, Haswell, GNU/Linux): old: 102329530 decicycles in mpegaudio_tableinit, 1 runs, 0 skips new: 34111900 decicycles in mpegaudio_tableinit, 1 runs, 0 skips Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>	9 years ago
Mans Rullgard	4bac1bbc3b	mpegaudio: add _fixed suffix to some names This adds a _fixed suffix to the fixed-point versions of things with both float and fixed-point variants. This makes it more consistent with other dual-implementation things, e.g. fft. Signed-off-by: Mans Rullgard <mans@mansr.com>	14 years ago
Mans Rullgard	2912e87a6c	Replace FFmpeg with Libav in licence headers Signed-off-by: Mans Rullgard <mans@mansr.com>	14 years ago
Diego Pettenò	350120d269	tablegen: implement and use WRITE_ARRAY macros Two macros (WRITE_ARRAY and WRITE_ARRAY_2D) take the prefix (modifiers) (not all tables are static, and they might not be constant either), the type, and the name of the array. It'll be copied with same name and type, and with the correct size of the currently-defined object. Originally committed as revision 23821 to svn://svn.ffmpeg.org/ffmpeg/trunk	15 years ago
Diego Pettenò	ac014798ff	tableprint: use the type name as-is for the functions' names. This drops one parameter from the functions' macros, and require structures to be typedeffed, but ensures that it is possible to map 1-to-1 the type to the function name. Originally committed as revision 23820 to svn://svn.ffmpeg.org/ffmpeg/trunk	15 years ago
Michael Kostylev	3e48d792b6	Fix mpegaudio tablegen. Patch by Michael Kostylev, michael D kostylev A gmail Originally committed as revision 23106 to svn://svn.ffmpeg.org/ffmpeg/trunk	15 years ago
Reimar Döffinger	8eaa6e0e04	Change/simplify the tableprint/tablegen API. Originally committed as revision 22761 to svn://svn.ffmpeg.org/ffmpeg/trunk	15 years ago
Reimar Döffinger	eadaa00c6f	Add support for hardcoding the mpegaudiodec tables. Reduces .bss size by about 194 kB. Originally committed as revision 20400 to svn://svn.ffmpeg.org/ffmpeg/trunk	15 years ago

12 Commits (161d0aa2a8d18f1f8a01cbc4c1061eadcbe592e5)