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| | | .\" ======================================================================== |
| | | .\" |
| | | .IX Title "doc::libswresample 3" |
| | | .TH doc::libswresample 3 " " " " " " |
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| | | .if n .ad l |
| | | .nh |
| | | .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), |
| | | \&\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. |