mirror of
https://github.com/FFmpeg/FFmpeg.git
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ed8ddf0bd3
When operating on large blocks of data it's common to repeatedly use
an instruction on multiple registers. Using the REPX macro makes it
easy to quickly write dense code to achieve this without having to
explicitly duplicate the same instruction over and over.
For example,
REPX {paddw x, m4}, m0, m1, m2, m3
REPX {mova [r0+16*x], m5}, 0, 1, 2, 3
will expand to
paddw m0, m4
paddw m1, m4
paddw m2, m4
paddw m3, m4
mova [r0+16*0], m5
mova [r0+16*1], m5
mova [r0+16*2], m5
mova [r0+16*3], m5
Commit taken from x264:
6d10612ab0
Signed-off-by: Frank Plowman <post@frankplowman.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
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.