You've already forked FFmpeg
mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2025-11-23 21:54:53 +02:00
cb054ee89b
The only difference between it and the H.264/VC-1 versions is the bias constant which depends on the shift parameters for RV40. This value ends up in a register and therefore one can reuse the H.264 code by setting the registers for RV40 and then jumping into the relevant H.264 function, making the four new functions cheap (just 256 bytes in total). This approach uses one jump more for the no-filter case and one jump less in the one-dimensional case than an approach using separate functions. avg_chroma_mc4_c: 167.5 ( 1.00x) avg_chroma_mc4_mmxext: 48.1 ( 3.48x) avg_chroma_mc4_ssse3: 31.1 ( 5.39x) avg_chroma_mc8_c: 325.5 ( 1.00x) avg_chroma_mc8_mmxext: 103.2 ( 3.15x) avg_chroma_mc8_ssse3: 33.5 ( 9.71x) put_chroma_mc4_c: 137.4 ( 1.00x) put_chroma_mc4_mmx: 44.5 ( 3.09x) put_chroma_mc4_ssse3: 28.4 ( 4.83x) put_chroma_mc8_c: 271.4 ( 1.00x) put_chroma_mc8_mmx: 99.9 ( 2.72x) put_chroma_mc8_ssse3: 30.6 ( 8.86x) Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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.