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https://gitee.com/openharmony/third_party_ffmpeg
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72 lines
1.8 KiB
Plaintext
72 lines
1.8 KiB
Plaintext
\input texinfo @c -*- texinfo -*-
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@documentencoding UTF-8
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@settitle Libswresample Documentation
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@titlepage
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@center @titlefont{Libswresample Documentation}
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@end titlepage
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@top
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@contents
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@chapter Description
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@c man begin DESCRIPTION
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The libswresample library performs highly optimized audio resampling,
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rematrixing and sample format conversion operations.
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Specifically, this library performs the following conversions:
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@itemize
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@item
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@emph{Resampling}: is the process of changing the audio rate, for
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example from a high sample rate of 44100Hz to 8000Hz. Audio
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conversion from high to low sample rate is a lossy process. Several
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resampling options and algorithms are available.
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@item
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@emph{Format conversion}: is the process of converting the type of
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samples, for example from 16-bit signed samples to unsigned 8-bit or
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float samples. It also handles packing conversion, when passing from
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packed layout (all samples belonging to distinct channels interleaved
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in the same buffer), to planar layout (all samples belonging to the
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same channel stored in a dedicated buffer or "plane").
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@item
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@emph{Rematrixing}: is the process of changing the channel layout, for
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example from stereo to mono. When the input channels cannot be mapped
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to the output streams, the process is lossy, since it involves
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different gain factors and mixing.
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@end itemize
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Various other audio conversions (e.g. stretching and padding) are
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enabled through dedicated options.
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@c man end DESCRIPTION
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@chapter See Also
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@ifhtml
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@url{ffmpeg.html,ffmpeg}, @url{ffplay.html,ffplay}, @url{ffprobe.html,ffprobe},
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@url{ffmpeg-resampler.html,ffmpeg-resampler},
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@url{libavutil.html,libavutil}
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@end ifhtml
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@ifnothtml
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ffmpeg(1), ffplay(1), ffprobe(1),
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ffmpeg-resampler(1),
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libavutil(3)
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@end ifnothtml
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@include authors.texi
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@ignore
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@setfilename libswresample
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@settitle audio resampling library
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@end ignore
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@bye
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