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Andreas Rheinhardt 5a261cfa32 avformat/allformats: Fix data race when accessing devices lists 
Up until now setting the input and output devices lists is guarded
by a mutex. This prevents data races emanating from multiple concurrent
calls to avpriv_register_devices() (triggered by multiple concurrent
calls to avdevice_register_all()). Yet reading the lists pointers was
done without any lock and with nonatomic variables. This means that
there are data races in case of concurrent calls to
av_(de)muxer_iterate() and avdevice_register_all() (but only if the
iteration in av_(de)muxer_iterate exhausts the non-device (de)muxers).

This commit fixes this by putting said pointers into atomic objects.
Due to the unavailability of _Atomic the object is an atomic_uintptr,
leading to ugly casts. Switching to atomics also allowed to remove
the mutex currently used in avpriv_register_devices().

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
 		2021-10-09 13:20:39 +02:00
compat Replace all occurences of av_mallocz_array() by av_calloc() 2021-09-20 01:03:52 +02:00
doc avcodec: GEM Raster image decoder 2021-10-08 20:37:36 +11:00
ffbuild avfilter: compress CUDA PTX code if possible 2021-06-22 14:05:44 +02:00
fftools fftools/ffmpeg, ffmpeg_opt: Allocate (In|Out)putStream.pkt early 2021-10-08 16:03:21 +02:00
libavcodec avcodec/h274: Fix signed left shift 2021-10-09 11:42:16 +02:00
libavdevice libavdevice/avfoundation.m: fix potential unreleased lock issue 2021-09-17 15:31:40 +02:00
libavfilter avfilter/af_axcorrelate: fix integer overflow for huge segments 2021-10-09 01:44:23 +02:00
libavformat avformat/allformats: Fix data race when accessing devices lists 2021-10-09 13:20:39 +02:00
libavutil avutil/detection_bbox: Fix av_detection_bbox_alloc failed if nb_bboxes == 0 2021-10-08 10:11:59 +08:00
libpostproc libpostproc/postprocess_template: Don't reimplement FFSWAP 2021-10-02 17:13:42 +02:00
libswresample swresample/aarch64: fix relocation out of range error 2021-09-25 21:55:29 +03:00
libswscale swscale/swscale: Pass slice location into unscaled code also for dst scaling 2021-10-03 20:38:29 +02:00
presets
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tests tests/fate-run: Use DEC_OPTS for additional input, too 2021-10-08 12:06:00 +02:00
tools tools/target_dec_fuzzer: Adjust threshold for WMV2 2021-09-26 17:22:22 +02:00
.gitattributes
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.gitignore avfilter: compress CUDA PTX code if possible 2021-06-22 14:05:44 +02:00
.mailmap
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.travis.yml
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CONTRIBUTING.md
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COPYING.GPLv2
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COPYING.GPLv3
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COPYING.LGPLv2.1
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COPYING.LGPLv3
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CREDITS
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Changelog avcodec: GEM Raster image decoder 2021-10-08 20:37:36 +11:00
INSTALL.md
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LICENSE.md
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MAINTAINERS avformat: add Argonaut Games CVG demuxer 2021-05-12 20:25:50 +10:00
Makefile FATE: add a test for sliced scaling 2021-08-08 19:26:05 +02:00
README.md README: fix typo and description of libavfilter 2021-10-08 09:44:34 +05:30
RELEASE
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configure avfilter/sharpen_npp: add sharpening video filter with borders control 2021-10-07 18:07:53 +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.