mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2026-06-11 08:13:06 +00:00
Niklas HaasandRamiro Polla
36004d681f
This decomposes a swizzle mask into a series of optimal register-register moves, using at most two temporary scratch registers. This is a better match for ASM-style backends than the existing PERMUTE/COPY uops that are designed for the needs of the C backend (or other backends which either apply the swizzle mask directly or permute pointers). I originally had logic equivalent to this written in NASM macros, but it was just such a complicated mess that I think it's better to rewrite it in C and have the resulting metadata be an explicit part of the uop definition. This commit only adds the uop, I'll update the x86 implementation in the next step. Co-authored-by: Ramiro Polla <ramiro.polla@gmail.com> Signed-off-by: Niklas Haas <git@haasn.dev>
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.