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hqxvlc.c contains sort-of run-length VLCs in hardcoded form; they amount to 26688 elements, taking 104KiB. These tables contain many duplicated entries (they are partially created via a RPT_1024 macro). There are actually only 3039 different codes in all tables combined, making this very wasteful. This commit changes this by extracting the underlying entries and creating a (static) RL-VLC. This only costs 3*3039 bytes of .rodata. The resulting table needs only 15630 entries, because our VLC init code uses smaller subtables when possible (for an incomplete code, the negative of the length stored in the VLC code is the number of bits the subtable uses; the hardcoded tables uses a worst-case per table value). Using GET_RL_VLC also gets rid of an unnecessary reload in case a code is too long to be parsed in the first stage. 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.