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107 lines
3.6 KiB
107 lines
3.6 KiB
5 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<title>FFmpeg documentation</title>
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<link rel="stylesheet" href="bootstrap.min.css" />
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<link rel="stylesheet" href="style.min.css" />
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<meta name="description" content="Libswresample Documentation: ">
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<meta name="keywords" content="FFmpeg documentation : Libswresample ">
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<meta name="Generator" content="texi2html 5.0">
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<!-- Created on July 3, 2018 by texi2html 5.0 -->
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Lionel Cons <Lionel.Cons@cern.ch> (original author)
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Olaf Bachmann <obachman@mathematik.uni-kl.de>
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and many others.
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Maintained by: Many creative people.
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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</head>
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<body>
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<div class="container">
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<h1 class="titlefont">Libswresample Documentation</h1>
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<hr>
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<a name="SEC_Top"></a>
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<a name="SEC_Contents"></a>
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<h1>Table of Contents</h1>
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<div class="contents">
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<ul class="no-bullet">
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<li><a name="toc-Description" href="#Description">1 Description</a></li>
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<li><a name="toc-See-Also" href="#See-Also">2 See Also</a></li>
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<li><a name="toc-Authors" href="#Authors">3 Authors</a></li>
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</ul>
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</div>
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<hr size="6">
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<a name="Description"></a>
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<h1 class="chapter"><a href="libswresample.html#toc-Description">1 Description</a></h1>
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<p>The libswresample library performs highly optimized audio resampling,
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rematrixing and sample format conversion operations.
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</p>
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<p>Specifically, this library performs the following conversions:
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</p>
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<ul>
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<li>
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<em>Resampling</em>: is the process of changing the audio rate, for
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example from a high sample rate of 44100Hz to 8000Hz. Audio
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conversion from high to low sample rate is a lossy process. Several
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resampling options and algorithms are available.
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</li><li>
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<em>Format conversion</em>: is the process of converting the type of
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samples, for example from 16-bit signed samples to unsigned 8-bit or
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float samples. It also handles packing conversion, when passing from
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packed layout (all samples belonging to distinct channels interleaved
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in the same buffer), to planar layout (all samples belonging to the
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same channel stored in a dedicated buffer or "plane").
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</li><li>
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<em>Rematrixing</em>: is the process of changing the channel layout, for
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example from stereo to mono. When the input channels cannot be mapped
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to the output streams, the process is lossy, since it involves
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different gain factors and mixing.
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</li></ul>
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<p>Various other audio conversions (e.g. stretching and padding) are
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enabled through dedicated options.
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</p>
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<a name="See-Also"></a>
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<h1 class="chapter"><a href="libswresample.html#toc-See-Also">2 See Also</a></h1>
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<p><a href="ffmpeg.html">ffmpeg</a>, <a href="ffplay.html">ffplay</a>, <a href="ffprobe.html">ffprobe</a>,
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<a href="ffmpeg-resampler.html">ffmpeg-resampler</a>,
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<a href="libavutil.html">libavutil</a>
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</p>
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<a name="Authors"></a>
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<h1 class="chapter"><a href="libswresample.html#toc-Authors">3 Authors</a></h1>
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<p>The FFmpeg developers.
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</p>
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<p>For details about the authorship, see the Git history of the project
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(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command
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<code>git log</code> in the FFmpeg source directory, or browsing the
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online repository at <a href="http://source.ffmpeg.org">http://source.ffmpeg.org</a>.
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</p>
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<p>Maintainers for the specific components are listed in the file
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‘<tt>MAINTAINERS</tt>’ in the source code tree.
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</p>
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</div>
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</body>
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</html>
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