ffmpeg/doc/libswresample.texi

   1 \input texinfo @c -*- texinfo -*-
   2
   3 @settitle Libswresample Documentation
   4 @titlepage
   5 @center @titlefont{Libswresample Documentation}
   6 @end titlepage
   7
   8 @top
   9
  10 @contents
  11
  12 @chapter Description
  13 @c man begin DESCRIPTION
  14
  15 The libswresample library performs highly optimized audio resampling,
  16 rematrixing and sample format conversion operations.
  17
  18 Specifically, this library performs the following conversions:
  19
  20 @itemize
  21 @item
  22 @emph{Resampling}: is the process of changing the audio rate, for
  23 example from a high sample rate of 44100Hz to 8000Hz. Audio
  24 conversion from high to low sample rate is a lossy process. Several
  25 resampling options and algorithms are available.
  26
  27 @item
  28 @emph{Format conversion}: is the process of converting the type of
  29 samples, for example from 16-bit signed samples to unsigned 8-bit or
  30 float samples. It also handles packing conversion, when passing from
  31 packed layout (all samples belonging to distinct channels interleaved
  32 in the same buffer), to planar layout (all samples belonging to the
  33 same channel stored in a dedicated buffer or "plane").
  34
  35 @item
  36 @emph{Rematrixing}: is the process of changing the channel layout, for
  37 example from stereo to mono. When the input channels cannot be mapped
  38 to the output streams, the process is lossy, since it involves
  39 different gain factors and mixing.
  40 @end itemize
  41
  42 Various other audio conversions (e.g. stretching and padding) are
  43 enabled through dedicated options.
  44
  45 @c man end DESCRIPTION
  46
  47 @chapter See Also
  48
  49 @ifhtml
  50 @url{ffmpeg.html,ffmpeg}, @url{ffplay.html,ffplay}, @url{ffprobe.html,ffprobe}, @url{ffserver.html,ffserver},
  51 @url{ffmpeg-resampler.html,ffmpeg-resampler},
  52 @url{libavutil.html,libavutil}
  53 @end ifhtml
  54
  55 @ifnothtml
  56 ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1),
  57 ffmpeg-resampler(1),
  58 libavutil(3)
  59 @end ifnothtml
  60
  61 @include authors.texi
  62
  63 @ignore
  64
  65 @setfilename libswresample
  66 @settitle audio resampling library
  67
  68 @end ignore
  69
  70 @bye