| =encoding utf8 | |
| =head1 NAME | |
| libswresample - audio resampling library | |
| =head1 DESCRIPTION | |
| The libswresample library performs highly optimized audio resampling, | |
| rematrixing and sample format conversion operations. | |
| Specifically, this library performs the following conversions: | |
| =over 4 | |
| =item * | |
| I<Resampling>: is the process of changing the audio rate, for | |
| example from a high sample rate of 44100Hz to 8000Hz. Audio | |
| conversion from high to low sample rate is a lossy process. Several | |
| resampling options and algorithms are available. | |
| =item * | |
| I<Format conversion>: is the process of converting the type of | |
| samples, for example from 16-bit signed samples to unsigned 8-bit or | |
| float samples. It also handles packing conversion, when passing from | |
| packed layout (all samples belonging to distinct channels interleaved | |
| in the same buffer), to planar layout (all samples belonging to the | |
| same channel stored in a dedicated buffer or "plane"). | |
| =item * | |
| I<Rematrixing>: is the process of changing the channel layout, for | |
| example from stereo to mono. When the input channels cannot be mapped | |
| to the output streams, the process is lossy, since it involves | |
| different gain factors and mixing. | |
| =back | |
| Various other audio conversions (e.g. stretching and padding) are | |
| enabled through dedicated options. | |
| =head1 SEE ALSO | |
| ffmpeg(1), ffplay(1), ffprobe(1), | |
| ffmpeg-resampler(1), | |
| libavutil(3) | |
| =head1 AUTHORS | |
| The FFmpeg developers. | |
| For details about the authorship, see the Git history of the project | |
| (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command | |
| B<git log> in the FFmpeg source directory, or browsing the | |
| online repository at E<lt>B<https://git.ffmpeg.org/ffmpeg>E<gt>. | |
| Maintainers for the specific components are listed in the file | |
| F<MAINTAINERS> in the source code tree. | |