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Very similar to the AVBufferPool API, but with some differences: 1. Reusing an already existing entry does not incur an allocation at all any more (the AVBufferPool API needs to allocate an AVBufferRef). 2. The tasks done while holding the lock are smaller; e.g. allocating new entries is now performed without holding the lock. The same goes for freeing. 3. The entries are freed as soon as possible (the AVBufferPool API frees them in two batches: The first in av_buffer_pool_uninit() and the second immediately before the pool is freed when the last outstanding entry is returned to the pool). 4. The API is designed for objects and not naked buffers and therefore has a reset callback. This is called whenever an object is returned to the pool. 5. Just like with the RefStruct API, custom allocators are not supported. (If desired, the FFRefStructPool struct itself could be made reference counted via the RefStruct API; an FFRefStructPool would then be freed via ff_refstruct_unref().) Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> 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.