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Frank Plowman 8bd66a8c95 lavc/vvc: Check slice structure 
The criteria for slice structure validity is similar to that of
subpicture structure validity that we saw not too long ago [1].
The relationship between tiles and slices must satisfy the following
properties:

* Exhaustivity.  All tiles in a picture must belong to a slice.  The
  tiles cover the picture, so this implies the slices must cover the
  picture.
* Mutual exclusivity.  No tile may belong to more than one slice, i.e.
  slices may not overlap.

In most cases these properties are guaranteed by the syntax.  There is
one noticable exception however: when pps_tile_idx_delta_present_flag is
equal to one, each slice is associated with a syntax element
pps_tile_idx_delta_val[i] which "specifies the difference between the
tile index of the tile containing the first CTU in the ( i + 1 )-th
rectangular slice and the tile index of the tile containing the first
CTU in the i-th rectangular slice" [2].  When these syntax elements are
present, the i-th slice can begin anywhere and the usual guarantees
provided by the syntax are lost.

The patch detects slice structures which violate either of the two
properties above, and are therefore invalid, while building the
slice map.  Should the slice map be determined to be invalid, an
AVERROR_INVALIDDATA is returned.  This prevents issues including
segmentation faults when trying to decode,  invalid bitstreams.

[1]: https://ffmpeg.org//pipermail/ffmpeg-devel/2024-October/334470.html
[2]: H.266 (V3) Section 7.4.3.5, Picture parameter set RBSP semantics

Signed-off-by: Frank Plowman <post@frankplowman.com>
2025-01-12 13:15:06 +08:00
compat compat/w32pthreads: change pthread_t into pointer to malloced struct 2024-12-16 09:43:19 +01:00
doc avutil/frame: add AV_FRAME_SIDE_DATA_FLAG_NEW_REF 2025-01-10 15:02:22 -03:00
ffbuild configure: Add wasm as a fake arch 2024-12-04 16:43:06 +08:00
fftools fftools/ffprobe: print lossless frame flag 2025-01-05 22:23:16 +01:00
libavcodec lavc/vvc: Check slice structure 2025-01-12 13:15:06 +08:00
libavdevice avdevice/dshow: fix unused variable warning 2024-10-17 13:04:17 +02:00
libavfilter avfilter/af_pan: Fix sscanf() use 2025-01-08 23:23:24 +01:00
libavformat avformat/iff: ignore FVER tag when not processing DSD/DST files 2025-01-12 11:14:16 +11:00
libavutil avutil/frame.h: improve documentation for AV_FRAME_FLAG_LOSSLESS 2025-01-11 10:31:00 -05:00
libpostproc */version.h: bump after release/7.1 branch 2024-09-24 17:10:35 +02:00
libswresample arm: Consistently use proper interworking function returns 2024-10-09 15:52:51 +03:00
libswscale swscale/output: Fix undefined overflow in yuv2rgba64_full_X_c_template() 2025-01-08 23:23:24 +01:00
presets
tests fate/vvc: Add vvc-frames-with-ltr.vvc 2025-01-08 10:10:06 -03:00
tools tools/target_dec_fuzzer: Adjust threshold for MSCC 2025-01-08 23:23:26 +01:00
.gitattributes lavf/assenc: normalize line endings to \n 2024-02-11 17:01:07 -08:00
.gitignore .gitignore: add exclusions for shader .c files 2024-11-18 07:54:21 +01:00
.mailmap mailmap: add entry for myself 2024-07-15 01:59:37 +02:00
Changelog avcodec/libjxl: add animated JPEG XL encoder 2025-01-03 19:37:28 -05:00
configure avcodec/libjxl: add animated JPEG XL encoder 2025-01-03 19:37:28 -05:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS Use https for repository links 2023-03-01 21:59:10 +01:00
INSTALL.md INSTALL: explain the circular dependency issue and solution 2024-11-03 19:35:23 +01:00
LICENSE.md avfilter/vf_geq: Relicense to LGPL 2019-12-28 11:20:48 +01:00
MAINTAINERS MAINTAINERS: Lauri is still available but is really low on time nowadays 2024-11-28 23:19:00 +01:00
Makefile configure: Add wasm as a fake arch 2024-12-04 16:43:06 +08:00
README.md README: fix typo and description of libavfilter 2021-10-08 09:44:34 +05:30
RELEASE RELEASE: update release number after release/7.1 branch 2024-10-09 01:55:50 +02:00

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 means to alter decoded audio and video through a directed graph of connected 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.