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.IX Title "doc::libswresample 3"

.TH doc::libswresample 3 " " " " " "

.SH "NAME"

libswresample \- audio resampling library

.SH "DESCRIPTION"

.IX Header "DESCRIPTION"

The libswresample library performs highly optimized audio resampling,

rematrixing and sample format conversion operations.

.PP

Specifically, this library performs the following conversions:

.IP "\(bu" 4

\&\fIResampling\fR: 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.

.IP "\(bu" 4

\&\fIFormat conversion\fR: 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 \*(L"plane\*(R").

.IP "\(bu" 4

\&\fIRematrixing\fR: 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.

.PP

Various other audio conversions (e.g. stretching and padding) are

enabled through dedicated options.

.SH "SEE ALSO"

.IX Header "SEE ALSO"

\&\fIffmpeg\fR\|(1), \fIffplay\fR\|(1), \fIffprobe\fR\|(1), \fIffserver\fR\|(1),

\&\fIffmpeg\-resampler\fR\|(1),

\&\fIlibavutil\fR\|(3)

.SH "AUTHORS"

.IX Header "AUTHORS"

The FFmpeg developers.

.PP

For details about the authorship, see the Git history of the project

(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command

\&\fBgit log\fR in the FFmpeg source directory, or browsing the

online repository at <\fBhttp://source.ffmpeg.org\fR>.

.PP

Maintainers for the specific components are listed in the file

\&\fI\s-1MAINTAINERS\s0\fR in the source code tree.