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Creating CFHD RL VLC tables works by first extending the codes by the sign, followed by creating a VLC, followed by deriving the RL VLC from this VLC (which is then discarded). Extending the codes uses stack arrays. The tables used to initialize the VLC are already sorted from left-to-right in the tree. This means that the corresponding VLC entries are generally also ascending, but not always: Entries from subtables always follow the corresponding main table although it is possible for the right-most node to fit into the main table. This suggests that one can try to use the final destination buffer as scratch buffer for the tables with sign included. Unfortunately it works for neither of the tables if one uses the right-most part of the RL VLC buffer as scratch buffer; using the left-most part of the RL VLC buffer as scratch buffer might work if one traverses the VLC entries from end to start. But it works only for the little RL VLC (table 9), not for table 18. Therefore this patch uses the RL VLC buffer for table 9 as scratch buffer for creating the bigger table 18. Afterwards the left part of the buffer for table 9 is used as scratch buffer to create table 9. This fixes the cfhd part of ticket #9399 (if it is not already fixed). Notice that I do not consider the previous stack usage excessive. Reviewed-by: Paul B Mahol <onemda@gmail.com> 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.