Chiebot-Mirror/FFmpeg - FFmpeg - Gitea: Git with a cup of tea

Author	SHA1	Message	Date
Rémi Denis-Courmont	f0ef11ea83	lavc/bswapdsp: RISC-V B bswap_buf Simply taking the Zbb REV8 instruction into use in a simple loop gives some significant savings: bswap_buf_c: 1081.0 bswap_buf_rvb_b: 771.0 But we can also use the 64-bit REV8 as a pseudo-SIMD instruction with just one additional shift, and one fewer load, effectively doubling the bandwidth. Consequently, this patch is useful even if the compile-time target has Zbb enabled for C code: bswap_buf_c: 1081.0 bswap_buf_rvb_b: 341.0 (this patch) On the other hand, this approach fails miserably for bswap16_buf as the ratio of shifts and stores becomes unfavorable compared to naïve C: bswap16_buf_c: 1542.0 bswap16_buf_rvb_b: 1803.7 Unrolling to process 128 bits (4 samples) at a time actually worsens performance ever so slightly: bswap_buf_c: 1081.0 bswap_buf_rvb_b: 408.5	2 years ago
Andreas Rheinhardt	40e6575aa3	all: Replace if (ARCH_FOO) checks by #if ARCH_FOO This is more spec-compliant because it does not rely on dead-code elimination by the compiler. Especially MSVC has problems with this, as can be seen in https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/296373.html or https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/297022.html This commit does not eliminate every instance where we rely on dead code elimination: It only tackles branching to the initialization of arch-specific dsp code, not e.g. all uses of CONFIG_ and HAVE_ checks. But maybe it is already enough to compile FFmpeg with MSVC with whole-programm-optimizations enabled (if one does not disable too many components). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>	3 years ago
Diego Biurrun	c67b449beb	dsputil: Split bswap*_buf() off into a separate context	11 years ago
Mans Rullgard	2912e87a6c	Replace FFmpeg with Libav in licence headers Signed-off-by: Mans Rullgard <mans@mansr.com>	14 years ago
Anssi Hannula	8079d2ec08	Move code to be used by the IEC 61937 demuxer from spifenc.c into common files spdif.h and spdif.c. Patch by Anssi Hannula, anssi d hannula a iki d fi Originally committed as revision 25715 to svn://svn.ffmpeg.org/ffmpeg/trunk	14 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	30ad1a6651	Include appropriate header in table generators instead of using a dummy av_cold define. Originally committed as revision 22723 to svn://svn.ffmpeg.org/ffmpeg/trunk	15 years ago
Reimar Döffinger	14b8607065	Add support for hard-coded MDCT-related ff_sine_windows tables. Originally committed as revision 21108 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