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Michael Niedermayer a4f01dfad9 avcodec/tiff: Restrict tag order based on specification 
"The entries in an IFD must be sorted in ascending order by Tag. Note that this is
 not the order in which the fields are described in this document."

This way various dimensions, sample and bit sizes cannot be changed at
arbitrary times which reduces the potential for bugs.
The tag reading code also on various places assumes that numerically previous
tags have already been parsed, so this needs to be enforced one way or another.

If this commit causes problems with real world files which are not easy to fix
then some other form of checks are needed to ensure the various dependencies
in the tag reading are not violated.

Fixes: out of array access
Fixes: 24825/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-6326925027704832

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit ad29f9e47c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2021-09-09 13:37:20 +02:00
compat compat: remove in-tree NVidia headers 2018-02-27 16:22:12 +01:00
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fftools fftools/ffmpeg: Fix integer overflow in duration computation in seek_to_start() 2020-07-03 12:10:23 +02:00
libavcodec avcodec/tiff: Restrict tag order based on specification 2021-09-09 13:37:20 +02:00
libavdevice Bump minor versions for branching 4.1 2018-11-02 00:15:32 +01:00
libavfilter avfilter/vf_aspect: Fix integer overflow in compute_dar() 2020-07-03 12:10:23 +02:00
libavformat avformat/siff: Reject audio packets without audio stream 2021-09-09 13:37:20 +02:00
libavresample avresample: remove deprecated attribute from the AVAudioResampleContext struct 2018-01-09 10:56:53 -03:00
libavutil avutil/common: Fix integer overflow in av_ceil_log2_c() 2020-07-03 12:10:24 +02:00
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README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides a mean to alter decoded Audio and Video through chain of filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements 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, ismindex and qt-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.