| \input texinfo @c -*- texinfo -*- |
| @documentencoding UTF-8 |
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| @settitle Libswresample Documentation |
| @titlepage |
| @center @titlefont{Libswresample Documentation} |
| @end titlepage |
| |
| @top |
| |
| @contents |
| |
| @chapter Description |
| @c man begin DESCRIPTION |
| |
| The libswresample library performs highly optimized audio resampling, |
| rematrixing and sample format conversion operations. |
| |
| Specifically, this library performs the following conversions: |
| |
| @itemize |
| @item |
| @emph{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 |
| @emph{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 |
| @emph{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. |
| @end itemize |
| |
| Various other audio conversions (e.g. stretching and padding) are |
| enabled through dedicated options. |
| |
| @c man end DESCRIPTION |
| |
| @chapter See Also |
| |
| @ifhtml |
| @url{ffmpeg.html,ffmpeg}, @url{ffplay.html,ffplay}, @url{ffprobe.html,ffprobe}, @url{ffserver.html,ffserver}, |
| @url{ffmpeg-resampler.html,ffmpeg-resampler}, |
| @url{libavutil.html,libavutil} |
| @end ifhtml |
| |
| @ifnothtml |
| ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), |
| ffmpeg-resampler(1), |
| libavutil(3) |
| @end ifnothtml |
| |
| @include authors.texi |
| |
| @ignore |
| |
| @setfilename libswresample |
| @settitle audio resampling library |
| |
| @end ignore |
| |
| @bye |