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Ganesh Ajjanagadde 265f83fd35 avutil/common: add FFDIFFSIGN macro
This is of use for defining comparator callbacks. Common approaches like
return x-y are not safe due to the risks of overflow.
Furthermore, the (x > y) - (x < y) trick is optimized to branchless
code.
This also documents this macro accordingly.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
2015-11-03 16:28:12 -05:00
compat Merge commit '407ac22322e5ce67996ec54ef619cafa4c9ceb78' 2015-11-02 11:58:27 +01:00
doc avformat: add acm demuxer 2015-11-03 12:26:09 +01:00
libavcodec avcodec: add Interplay ACM decoder 2015-11-03 12:01:27 +01:00
libavdevice gdigrab: grab right desktop size if DPI in use, based on patch from Alexander Brotzge 2015-10-31 23:08:02 +11:00
libavfilter avfilter/vf_rotate: correct log message 2015-11-03 16:22:33 -05:00
libavformat avformat: add acm demuxer 2015-11-03 12:26:09 +01:00
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libavutil avutil/common: add FFDIFFSIGN macro 2015-11-03 16:28:12 -05:00
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Changelog avformat: add acm demuxer 2015-11-03 12:26:09 +01:00
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ffmpeg_dxva2.c
ffmpeg_filter.c ffmpeg_filter: check encoder before using it to set frame size. 2015-10-30 10:55:10 +01:00
ffmpeg_opt.c
ffmpeg_qsv.c
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ffmpeg.c ffmpeg: use log10 instead of log()/log(10) 2015-10-29 19:05:29 -04:00
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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. Few developers follow pull requests so they will likely be ignored.