bc533ba2ae
The headphone filter has an option for the user to specify an assignment of inputs to channels (or from pairs of channels of the second input to channels). Up until now, these channels were stored in an int containing the logarithm of the channel layout. Yet it is not the logarithm that is used lateron and so a retransformation was necessary. Therefore this commit simply stores the uint64_t as is, avoiding the retransformation. This also has the advantage that unset channels (whose corresponding entry is zero) can't be mistaken for valid channels any more; the old code had to initialize the channels to -1 to solve this problem and had to check for whether a channel is set before the retransformation (because 1 << -1 is UB). The only downside of this approach is that the size of the context increases (by 256 bytes); but this is not exceedingly much. Finally, the array has been moved to the end of the context; it is only used a few times during the initialization process and moving it decreased the offsets of lots of other entries, reducing codesize. 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.