716b396740
I spotted an interesting pattern that I didn't see before that leads to the implementation being faster. The bit shifting table I was using before is no longer needed, and was able to remove quite a few lines. I also add use of FMA on the AVX2 version. f32 1920x1080 1 thread with prelut c impl 1434012700 UNITS in lut3d->interp, 1 runs, 0 skips 1434035335 UNITS in lut3d->interp, 2 runs, 0 skips 1423615347 UNITS in lut3d->interp, 4 runs, 0 skips 1426268863 UNITS in lut3d->interp, 8 runs, 0 skips sse2 905484420 UNITS in lut3d->interp, 1 runs, 0 skips 905659010 UNITS in lut3d->interp, 2 runs, 0 skips 915167140 UNITS in lut3d->interp, 4 runs, 0 skips 915834222 UNITS in lut3d->interp, 8 runs, 0 skips avx 574794860 UNITS in lut3d->interp, 1 runs, 0 skips 581035090 UNITS in lut3d->interp, 2 runs, 0 skips 584116720 UNITS in lut3d->interp, 4 runs, 0 skips 581460290 UNITS in lut3d->interp, 8 runs, 0 skips avx2 301698880 UNITS in lut3d->interp, 1 runs, 0 skips 301982880 UNITS in lut3d->interp, 2 runs, 0 skips 306962430 UNITS in lut3d->interp, 4 runs, 0 skips 305472025 UNITS in lut3d->interp, 8 runs, 0 skips gbrap16 1920x1080 1 thread with prelut c impl 1480894840 UNITS in lut3d->interp, 1 runs, 0 skips 1502922990 UNITS in lut3d->interp, 2 runs, 0 skips 1496114307 UNITS in lut3d->interp, 4 runs, 0 skips 1492554551 UNITS in lut3d->interp, 8 runs, 0 skips sse2 980777180 UNITS in lut3d->interp, 1 runs, 0 skips 986121520 UNITS in lut3d->interp, 2 runs, 0 skips 986489840 UNITS in lut3d->interp, 4 runs, 0 skips 998832248 UNITS in lut3d->interp, 8 runs, 0 skips avx 622212360 UNITS in lut3d->interp, 1 runs, 0 skips 622981160 UNITS in lut3d->interp, 2 runs, 0 skips 645396315 UNITS in lut3d->interp, 4 runs, 0 skips 641057075 UNITS in lut3d->interp, 8 runs, 0 skips avx2 321336400 UNITS in lut3d->interp, 1 runs, 0 skips 321268920 UNITS in lut3d->interp, 2 runs, 0 skips 323459895 UNITS in lut3d->interp, 4 runs, 0 skips 324949967 UNITS in lut3d->interp, 8 runs, 0 skips
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides means to alter decoded audio and video through a directed graph of connected filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements color conversion and scaling routines.
Tools
- ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
- ffplay is a minimalistic multimedia player.
- ffprobe is a simple analysis tool to inspect multimedia content.
- Additional small tools such as
aviocat,ismindexandqt-faststart.
Documentation
The offline documentation is available in the doc/ directory.
The online documentation is available in the main website and in the wiki.
Examples
Coding examples are available in the doc/examples directory.
License
FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.
Contributing
Patches should be submitted to the ffmpeg-devel mailing list using
git format-patch or git send-email. Github pull requests should be
avoided because they are not part of our review process and will be ignored.