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103 lines
3.7 KiB
HTML
103 lines
3.7 KiB
HTML
8 months ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Created by , GNU Texinfo 7.0.1 -->
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<head>
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<meta charset="utf-8">
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<title>
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Libswresample Documentation
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</title>
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<meta name="viewport" content="width=device-width,initial-scale=1.0">
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<link rel="stylesheet" type="text/css" href="bootstrap.min.css">
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<link rel="stylesheet" type="text/css" href="style.min.css">
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</head>
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<body>
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<div class="container">
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<h1>
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Libswresample Documentation
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</h1>
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<div class="top-level-extent" id="SEC_Top">
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<div class="element-contents" id="SEC_Contents">
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<h2 class="contents-heading">Table of Contents</h2>
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<div class="contents">
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<ul class="toc-numbered-mark">
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<li><a id="toc-Description" href="#Description">1 Description</a></li>
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<li><a id="toc-See-Also" href="#See-Also">2 See Also</a></li>
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<li><a id="toc-Authors" href="#Authors">3 Authors</a></li>
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</ul>
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</div>
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</div>
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<ul class="mini-toc">
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<li><a href="#Description" accesskey="1">Description</a></li>
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<li><a href="#See-Also" accesskey="2">See Also</a></li>
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<li><a href="#Authors" accesskey="3">Authors</a></li>
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</ul>
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<div class="chapter-level-extent" id="Description">
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<h2 class="chapter">1 Description</h2>
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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 class="itemize mark-bullet">
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<li><em class="emph">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><em class="emph">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><em class="emph">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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</div>
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<div class="chapter-level-extent" id="See-Also">
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<h2 class="chapter">2 See Also</h2>
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<p><a class="url" href="ffmpeg.html">ffmpeg</a>, <a class="url" href="ffplay.html">ffplay</a>, <a class="url" href="ffprobe.html">ffprobe</a>,
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<a class="url" href="ffmpeg-resampler.html">ffmpeg-resampler</a>,
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<a class="url" href="libavutil.html">libavutil</a>
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</p>
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</div>
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<div class="chapter-level-extent" id="Authors">
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<h2 class="chapter">3 Authors</h2>
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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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(https://git.ffmpeg.org/ffmpeg), e.g. by typing the command
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<code class="command">git log</code> in the FFmpeg source directory, or browsing the
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online repository at <a class="url" href="https://git.ffmpeg.org/ffmpeg">https://git.ffmpeg.org/ffmpeg</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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<samp class="file">MAINTAINERS</samp> in the source code tree.
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</p>
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</div>
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</div>
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<p style="font-size: small;">
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This document was generated using <a class="uref" href="https://www.gnu.org/software/texinfo/"><em class="emph">makeinfo</em></a>.
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</p>
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</div>
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</body>
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</html>
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