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The ATRAC9 decoder creates VLCs with parameters contained in HuffmanCodebooks; some of these HuffmanCodebooks are empty and yet VLCs (that were completely unused*) were created from them. Said VLC contained a single table with 512 VLC_TYPE[2] entries, each of which indicated that this is an invalid code. This commit stops creating said VLCs. *: read_coeffs_coarse() uses the HuffmanCodebook at9_huffman_coeffs[cb][prec][cbi]. prec is c->precision_coarse[i] + 1 and every precision_coarse entry is in the 1..15 range after calc_precision(), so prec is >= 2 (all codebooks with prec < 2 are empty). The remaining empty codebooks are those with cb == 1 and cbi == 0, yet this is impossible, too: cb is given by c->codebookset[i] and this is always 0 if i < 8 (because those are never set to anything else in calc_codebook_idx()) and cbi is given by at9_q_unit_to_codebookidx[i] which is never zero if i >= 8. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.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.
- 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.