libswresample - audio resampling library
The libswresample library performs highly optimized audio resampling,
rematrixing and sample format conversion operations.
Specifically, this library performs the following conversions:
- •
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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.
- •
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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").
- •
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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.
Various other audio conversions (e.g. stretching and padding) are enabled
through dedicated options.
ffmpeg(1),
ffplay(1),
ffprobe(1),
ffmpeg-resampler(1),
libavutil(3)
The FFmpeg developers.
For details about the authorship, see the Git history of the project
(
https://git.ffmpeg.org/ffmpeg), e.g. by typing the command
git log in
the FFmpeg source directory, or browsing the online repository at <
https://git.ffmpeg.org/ffmpeg>.
Maintainers for the specific components are listed in the file
MAINTAINERS in the source code tree.