doc::libswresample(3) doc::libswresample(3)
NAME
libswresample - audio resampling library
DESCRIPTION
The libswresample library performs highly optimized audio resampling,
rematrixing and sample format conversion operations.
Specifically, this library performs the following conversions:
• 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.
• 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").
• 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.
SEE ALSO
ffmpeg(1), ffplay(1), ffprobe(1), ffmpeg-resampler(1), libavutil(3)
AUTHORS
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.
doc::libswresample(3)
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