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Commit bbc0d0c1fe2b7ecdc4367295594f084f85ad22f5 made the mjpeg decoder use default Huffman tables when none are given, yet when initializing the default Huffman tables, it did not use the correct number of entries of the arrays used to initialize the tables, but instead it used the biggest entry + 1 (as if it were a continuous array 0..biggest entry). This worked because the ff_init_vlc_sparse() (and its predecessors) always skipped entries with a length of zero and the length of the corresponding elements was always initialized to zero with only the sizes of the actually existing elements being set to a size > 0 lateron. Yet since commit 1249698e1b424cff8e77e6a83cfdbc9d11e01aa7 this is no longer so, as build_vlc() actually read the array containing the values itself. This implies that the wrong length now leads to a read beyond the end of the given array; this could lead to crashs (but usually doesn't); it is detectable by ASAN* and this commit fixes it. *: AddressSanitizer: global-buffer-overflow on address xy ... xy is located 0 bytes to the right of global variable 'avpriv_mjpeg_val_ac_luminance' Reviewed-by: Paul B Mahol <onemda@gmail.com> 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.