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yading@10: .\" ========================================================================
yading@10: .\"
yading@10: .IX Title "doc::libswresample 3"
yading@10: .TH doc::libswresample 3 "2013-04-21" " " " "
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yading@10: .SH "NAME"
yading@10: libswresample \- audio resampling library
yading@10: .SH "DESCRIPTION"
yading@10: .IX Header "DESCRIPTION"
yading@10: The libswresample library performs highly optimized audio resampling,
yading@10: rematrixing and sample format conversion operations.
yading@10: .PP
yading@10: Specifically, this library performs the following conversions:
yading@10: .IP "\(bu" 4
yading@10: \&\fIResampling\fR: is the process of changing the audio rate, for
yading@10: example from an high sample rate of 44100Hz to 8000Hz. Audio
yading@10: conversion from high to low sample rate is a lossy process. Several
yading@10: resampling options and algorithms are available.
yading@10: .IP "\(bu" 4
yading@10: \&\fIFormat conversion\fR: is the process of converting the type of
yading@10: samples, for example from 16\-bit signed samples to unsigned 8\-bit or
yading@10: float samples. It also handles packing conversion, when passing from
yading@10: packed layout (all samples belonging to distinct channels interleaved
yading@10: in the same buffer), to planar layout (all samples belonging to the
yading@10: same channel stored in a dedicated buffer or \*(L"plane\*(R").
yading@10: .IP "\(bu" 4
yading@10: \&\fIRematrixing\fR: is the process of changing the channel layout, for
yading@10: example from stereo to mono. When the input channels cannot be mapped
yading@10: to the output streams, the process is lossy, since it involves
yading@10: different gain factors and mixing.
yading@10: .PP
yading@10: Various other audio conversions (e.g. stretching and padding) are
yading@10: enabled through dedicated options.
yading@10: .SH "SEE ALSO"
yading@10: .IX Header "SEE ALSO"
yading@10: \&\fIffmpeg\fR\|(1), \fIffplay\fR\|(1), \fIffprobe\fR\|(1), \fIffserver\fR\|(1),
yading@10: \&\fIffmpeg\-resampler\fR\|(1),
yading@10: \&\fIlibavutil\fR\|(3)
yading@10: .SH "AUTHORS"
yading@10: .IX Header "AUTHORS"
yading@10: The FFmpeg developers.
yading@10: .PP
yading@10: For details about the authorship, see the Git history of the project
yading@10: (git://source.ffmpeg.org/ffmpeg), e.g. by typing the command
yading@10: \&\fBgit log\fR in the FFmpeg source directory, or browsing the
yading@10: online repository at <\fBhttp://source.ffmpeg.org\fR>.
yading@10: .PP
yading@10: Maintainers for the specific components are listed in the file
yading@10: \&\fI\s-1MAINTAINERS\s0\fR in the source code tree.