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This improves commit59c7022740. In ff_thread_report_progress(), the fast code path can load progress[field] with the relaxed memory order, and the slow code path can store progress[field] with the release memory order. These changes are mainly intended to avoid confusion when one inspects the source code. They are unlikely to have measurable performance improvement. ff_thread_report_progress() and ff_thread_await_progress() form a pair. ff_thread_await_progress() reads progress[field] with the acquire memory order (in the fast code path). Therefore, one expects to see ff_thread_report_progress() write progress[field] with the matching release memory order. In the fast code path in ff_thread_report_progress(), the atomic load of progress[field] doesn't need the acquire memory order because the calling thread is trying to make the data it just decoded visible to the other threads, rather than trying to read the data decoded by other threads. In ff_thread_get_buffer(), initialize progress[0] and progress[1] using atomic_init(). Signed-off-by: Wan-Teh Chang <wtc@google.com> Signed-off-by: Anton Khirnov <anton@khirnov.net> Merges Libav commit343e2833. Signed-off-by: wm4 <nfxjfg@googlemail.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 a mean to alter decoded Audio and Video through chain of 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.
- ffserver is a multimedia streaming server for live broadcasts.
- 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.