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Rather than hard-coding a separate set of NASM macros, or generating them with a separate function, we can just leverage the C preprocessor to generate a NASM source file *from* the existing ops macros. This is maybe a bit unorthodox, but it avoids unnecessary overhead from re-generating the macros twice, avoids manual updating of the NASM macros, and generally does not come with any real downside except being a bit ugly. The main source of ugliness is the fact that the C preprocessor expands everything into a single line, whereas NASM expects separate statements to be on separate lines. Very fortunately, we can work around this by writing a another NASM macro to take its arguments and dump them onto multiple lines. It may seem premature, but I went ahead and defined all the macros, since it was easy enough to do. I added the %include in this commit to trigger build errors that occur only as a result of introducing this file in the same commit that introduces it. 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.