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When parsing the channel mapping string (a string containing '|' delimited tokens each of which is supposed to contain a channel name like "FR"), the old code would at each step read up to seven uppercase characters from the input string and give this to av_get_channel_layout() to parse. The returned layout is then checked for being a layout with a single channel set by computing its logarithm. Besides being overtly complicated this also has the drawback of relying on the assumption that every channel name consists of at most seven uppercase letters only; but said assumption is wrong: The abbreviation of the second low frequency channel is LFE2. Furthermore it treats garbage like "FRfoo" as valid channel. This commit changes this by using av_get_channel_layout() directly; furthermore, av_get_channel_layout_nb_channels() (which uses popcount) is used to find out the number of channels instead of the custom code to calculate the logarithm. (As a consequence, certain other formats to specify the channel layouts are now accepted (like the hex versions of av_get_channel_layout()); but this is actually not bad at all.) Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides a mean to alter decoded Audio and Video through chain of filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements 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,ismindexandqt-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.