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Michael Niedermayer 831274fba4 avcodec/flacdsp: Avoid undefined operations in non debug builds 
This fixes ubsan warnings in non debug builds by using unsigned operations

in debug builds the correct signed operations are retained so that overflows
(which should not occur in valid files and may indicate problems in the DSP code
or decoder) can be detected.

Alternatively they can be changed to unsigned unconditionally, then its
not possible though to detect overflows easily if someone wants to test
the DSP code for overflows.

The 2nd alternative would be to leave the code as it is and accept that
there are undefined operations in the DSP code and that ubsan output is
full of them in some cases.

Similar changes would be needed in some other DSP routines

Suggested-by: Matt Wolenetz <wolenetz@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2017-02-04 02:27:53 +01:00
compat compat/atomics: rename header guards 2016-12-02 20:08:54 -03:00
doc doc: clarify option on looping infinitely in movie filter 2017-02-03 13:08:58 -09:00
libavcodec avcodec/flacdsp: Avoid undefined operations in non debug builds 2017-02-04 02:27:53 +01:00
libavdevice Merge commit '5d0f85f1b2469b60d0838330aabe5353fdd9ef1d' 2017-01-31 17:27:46 +01:00
libavfilter avfilter/vf_unsharp: Free out AVFrame on error 2017-02-03 21:52:22 +01:00
libavformat lavf/isom: Support DTS Express in mov. 2017-02-03 19:01:59 +01:00
libavresample Bump minor versions after 3.2 branchpoint to seperate release 2016-10-26 20:52:42 +02:00
libavutil avutil/hwcontext_vaapi: fix SEGV in vaTerminate when vaInitialize fails 2017-02-02 23:47:55 +00:00
libpostproc Bump minor versions after 3.2 branchpoint to seperate release 2016-10-26 20:52:42 +02:00
libswresample swresample/arm: cosmetic fixes 2017-01-13 21:24:25 +01:00
libswscale swscale: add P016 input support 2017-02-01 14:29:11 -08:00
presets presets: remove moldering iPod presets 2014-06-17 16:15:04 -08:00
tests Merge commit '9064777dbb335ab4809ae09e3fdcc0245f925cdc' 2017-02-02 11:40:58 +01:00
tools tools/target_dec_fuzzer: Only audio uses the return value to decode packets in pieces, correct the code to match that 2017-01-31 23:43:41 +01:00
.gitattributes fate: add SCC test 2017-01-27 17:06:42 +01:00
.gitignore Merge commit '6641819feedb086ebba3d2be89b8d33980f367e1' 2016-06-26 15:43:05 +02:00
.travis.yml Merge commit 'eda183287489b2c705843aa373a19c4e46fb2fec' 2015-11-22 17:12:24 +00:00
arch.mak mips: rename mipsdspr1 to mipsdsp 2015-12-04 02:35:42 +01:00
Changelog avfilter: add threshold filter 2017-01-30 18:44:08 +01:00
cmdutils_common_opts.h cmdutils: add show_demuxers and show_muxers 2016-11-08 01:56:31 +01:00
cmdutils_opencl.c cmdutils_opencl: fix resource_leak cid 1396852 2017-01-13 07:54:49 +08:00
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
common.mak Merge commit 'c5fd4b50610f62cbb3baa4f4108139363128dea1' 2016-06-27 19:39:46 +02:00
configure Merge commit '6f9e34baea4f6f484392e4e67f606a0835d07b73' 2017-02-02 11:22:04 +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_cuvid.c ffmpeg_cuvid: add 420 10-bit transcode support for hwaccel cuvid 2017-02-01 14:55:39 +01:00
ffmpeg_dxva2.c Merge commit '18c506e9e6e8df8b1d496d093077b8240ea68c28' 2016-06-26 15:34:01 +02:00
ffmpeg_filter.c ffmpeg: use buffersink accessors. 2017-01-12 14:06:16 +01:00
ffmpeg_opt.c ffmpeg.c: Add output file index and stream index to vstats file. 2017-01-27 22:16:37 +01:00
ffmpeg_qsv.c ffmpeg: Add an option "qsv_device" to choose proper node for QSV child device (vaapi or dxva2) 2017-01-11 20:21:09 +00:00
ffmpeg_vaapi.c ffmpeg_vaapi: Convert to use hw_frames_ctx only 2017-01-17 23:06:46 +00:00
ffmpeg_vdpau.c Merge commit 'f72db3f2f3a8c83a4f5dede8fa03434b2bf676c6' 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
ffmpeg.c ffmpeg: Add a missing line break when requesting a sample. 2017-02-02 09:45:15 +01:00
ffmpeg.h ffmpeg_opt.c: Introduce a -vstats_version option and document the existing -vstats format. 2017-01-25 22:03:10 +01:00
ffplay.c ffplay: allow borderless playback windows 2017-02-01 22:03:26 +01:00
ffprobe.c lavc: Add spherical packet side data API 2016-12-07 14:40:06 -05:00
ffserver_config.c ffserver_config: Check for failure to allocate FFServerIPAddressACL 2016-12-22 19:23:08 +01:00
ffserver_config.h ffsrever: Make the status page bitexact if any stream is bitexact 2016-11-29 19:26:26 +01:00
ffserver.c ffserver: local OOB write with custom program name 2017-01-08 03:50:56 +01:00
INSTALL.md
library.mak Merge commit 'c5fd4b50610f62cbb3baa4f4108139363128dea1' 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 myself for boadec.c 2017-01-31 18:41:49 +01:00
Makefile Merge commit '6641819feedb086ebba3d2be89b8d33980f367e1' 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.