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Wan-Teh Chang fed50c4304 avutil: fix data race in av_get_cpu_flags() 
Make the one-time initialization in av_get_cpu_flags() thread-safe. The
static variable |cpu_flags| in libavutil/cpu.c is read and written using
normal load and store operations. These are considered as data races.
The fix is to use atomic load and store operations.

The fix can be verified by running the libavutil/tests/cpu_init.c test
program under ThreadSanitizer:
    ./configure --toolchain=clang-tsan
    make libavutil/tests/cpu_init
    libavutil/tests/cpu_init

There should be no warnings from ThreadSanitizer.

Co-author: Dmitry Vyukov of Google, who suggested the data race fix.

Signed-off-by: Wan-Teh Chang <wtc@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2016-12-13 00:07:20 +01:00
compat compat/atomics: rename header guards 2016-12-02 20:08:54 -03:00
doc avcodec: Add max_pixels options 2016-12-10 22:24:10 +01:00
libavcodec avcodec/cuvid: fix compilation with msvc11 2016-12-12 13:09:55 +01:00
libavdevice Merge commit '0b1bd1b205' 2016-11-18 10:20:14 +01:00
libavfilter avfilter/af_ashowinfo: properly show input channel layout for unknown channel layouts 2016-12-10 11:57:12 +01:00
libavformat lavf/mov: Accept multiple fourcc for AVID 1:1. 2016-12-12 12:26:21 +01:00
libavresample Bump minor versions after 3.2 branchpoint to seperate release 2016-10-26 20:52:42 +02:00
libavutil avutil: fix data race in av_get_cpu_flags() 2016-12-13 00:07:20 +01:00
libpostproc Bump minor versions after 3.2 branchpoint to seperate release 2016-10-26 20:52:42 +02:00
libswresample swresample/resample_template: Add filter values in parallel 2016-12-10 02:44:21 +01:00
libswscale swscale: add gbr(a)p16 output support 2016-12-01 21:37:25 +01:00
presets
tests fate: Add h264 test for frame num gaps 2016-12-12 13:33:52 +00:00
tools zmqsend: Initialize ret to 0 2016-12-05 11:27:13 -08:00
.gitattributes Treat all '*.pnm' files as non-text file 2014-11-28 17:52:43 -05:00
.gitignore Merge commit '6641819fee' 2016-06-26 15:43:05 +02:00
.travis.yml Merge commit 'eda1832874' 2015-11-22 17:12:24 +00:00
arch.mak mips: rename mipsdspr1 to mipsdsp 2015-12-04 02:35:42 +01:00
Changelog configure: fail if autodetect-libraries are requested but not found 2016-12-10 19:29:37 +01:00
cmdutils.c cmdutils: remove duplicate windows.h include 2016-11-16 15:06:16 +01:00
cmdutils.h cmdutils: add show_demuxers and show_muxers 2016-11-08 01:56:31 +01:00
cmdutils_common_opts.h cmdutils: add show_demuxers and show_muxers 2016-11-08 01:56:31 +01:00
cmdutils_opencl.c all: use FFDIFFSIGN to resolve possible undefined behavior in comparators 2015-11-03 16:28:30 -05:00
common.mak Merge commit 'c5fd4b5061' 2016-06-27 19:39:46 +02:00
configure configure: fail if autodetect-libraries are requested but not found 2016-12-10 19:29:37 +01:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
ffmpeg.c ffmpeg: assert return value is initialized 2016-12-01 12:01:51 +01:00
ffmpeg.h Merge commit '50722b4f0c' 2016-11-13 15:33:39 +01:00
ffmpeg_cuvid.c doc: fix spelling errors 2016-10-21 23:58:47 +02:00
ffmpeg_dxva2.c Merge commit '18c506e9e6' 2016-06-26 15:34:01 +02:00
ffmpeg_filter.c ffmpeg_filter: fix several logic failures 2016-11-24 16:27:55 +01:00
ffmpeg_opt.c Avoid using the term "file" and prefer "url" in some docs and comments 2016-12-05 21:30:12 +01:00
ffmpeg_qsv.c ffmpeg_qsv: Fix hwaccel transcoding 2016-11-13 17:49:48 +00:00
ffmpeg_vaapi.c ffmpeg_vaapi: fix choice of decoder_format 2016-09-29 01:23:52 +02:00
ffmpeg_vdpau.c Merge commit 'f72db3f2f3' 2016-06-26 15:29:39 +02:00
ffmpeg_videotoolbox.c ffmpeg/videotoolbox: protect UTGetOSTypeFromString on both VDA and VT 2015-10-15 10:22:31 +02:00
ffplay.c ffplay: fix sws_scale possible out of bounds array access 2016-12-10 23:22:11 +01:00
ffprobe.c lavc: Add spherical packet side data API 2016-12-07 14:40:06 -05:00
ffserver.c ffserver: Check chunk size 2016-12-05 21:30:12 +01:00
ffserver_config.c ffsrever: Make the status page bitexact if any stream is bitexact 2016-11-29 19:26:26 +01:00
ffserver_config.h ffsrever: Make the status page bitexact if any stream is bitexact 2016-11-29 19:26:26 +01:00
INSTALL.md
library.mak Merge commit 'c5fd4b5061' 2016-06-27 19:39:46 +02:00
LICENSE.md lavfi/f_ebur128: relicense to LGPL 2016-11-27 20:46:20 +01:00
MAINTAINERS MAINTAINERS: Add Vittorio to "Developers with git write access who are currently not maintaining any specific part" 2016-11-25 02:07:43 +01:00
Makefile Merge commit '6641819fee' 2016-06-26 15:43:05 +02:00
README.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
RELEASE RELEASE: Update for past 3.2 branch 2016-10-26 20:52:43 +02:00
version.sh version.sh: Fix spurious rebuilds. 2016-03-10 09:53:10 +01:00

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 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.
  • ffserver is a multimedia streaming server for live broadcasts.
  • 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.