Google Git
Sign in
fuchsia/third_party/ffmpeg/upstream/master
commit
9cbd8896708050f12ccfcb1dd9aefda9e57dc349
[log]
author
Niklas Haas <git@haasn.dev>
Tue Jun 09 12:49:20 2026 +0200
committer
Niklas Haas <ffmpeg@haasn.dev>
Sat Jun 20 14:08:49 2026 +0000
tree
5f9bf515617cecb2fdadaa220d3ec9631953eae2
parent
310df19fcd16d5e416030781eda2dcdb2761933c [diff]
swscale/x86/ops: add AVX2/SSE4 path for SWS_UOP_READ_PALETTE

The AVX2 is a fairly straightforward vpgatherdd + 4x4 transpose. The SSE4
fallback is an unrolled scalar loop, for lack of anything better to do.

checkasm:
 - CPU: AMD Ryzen 9 9950X3D 16-Core Processor (00B40F40)
 - Timing source: x86 (rdtsc)
 - Bench duration: 10000 µs per function (45898205 cycles)
 - Random seed: 2518020648

Benchmark results:
  name                             cycles (vs ref)
  u8_read_palette_xyzw_c:          2877.5
  u8_read_palette_xyzw_x86_sse4:   1951.9 ( 1.47x)
  u8_read_palette_xyzw_x86_avx2:   1051.6 ( 2.74x)

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Niklas Haas <git@haasn.dev>
3 files changed
tree: 5f9bf515617cecb2fdadaa220d3ec9631953eae2
  1. .forgejo/
  2. compat/
  3. doc/
  4. ffbuild/
  5. fftools/
  6. libavcodec/
  7. libavdevice/
  8. libavfilter/
  9. libavformat/
  10. libavutil/
  11. libswresample/
  12. libswscale/
  13. presets/
  14. tests/
  15. tools/
  16. .gitattributes
  17. .gitignore
  18. .mailmap
  19. Changelog
  20. configure
  21. CONTRIBUTING.md
  22. COPYING.GPLv2
  23. COPYING.GPLv3
  24. COPYING.LGPLv2.1
  25. COPYING.LGPLv3
  26. CREDITS
  27. FUNDING.json
  28. INSTALL.md
  29. LICENSE.md
  30. MAINTAINERS
  31. Makefile
  32. README.md
  33. RELEASE
README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides means to alter decoded audio and video through a directed graph of connected filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements 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, ismindex and qt-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.