106 lines
3.5 KiB
HTML
106 lines
3.5 KiB
HTML
|
<!DOCTYPE html>
|
||
|
|
<html>
|
||
|
|
<!-- Created by GNU Texinfo 7.0.1, https://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||
|
|
<title>Libswresample Documentation</title>
|
||
|
|
|
||
|
|
<meta name="description" content="Libswresample Documentation">
|
||
|
|
<meta name="keywords" content="Libswresample Documentation">
|
||
|
|
<meta name="resource-type" content="document">
|
||
|
|
<meta name="distribution" content="global">
|
||
|
|
<meta name="Generator" content="makeinfo">
|
||
|
|
<meta name="viewport" content="width=device-width,initial-scale=1">
|
||
|
|
|
||
|
|
<link href="#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
ul.mark-bullet {list-style-type: disc}
|
||
|
|
ul.toc-numbered-mark {list-style: none}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en">
|
||
|
|
|
||
|
|
|
||
|
|
<div class="top-level-extent" id="SEC_Top">
|
||
|
|
|
||
|
|
|
||
|
|
<div class="element-contents" id="SEC_Contents">
|
||
|
|
<h2 class="contents-heading">Table of Contents</h2>
|
||
|
|
|
||
|
|
<div class="contents">
|
||
|
|
|
||
|
|
<ul class="toc-numbered-mark">
|
||
|
|
<li><a id="toc-Description" href="#Description">1 Description</a></li>
|
||
|
|
<li><a id="toc-See-Also" href="#See-Also">2 See Also</a></li>
|
||
|
|
<li><a id="toc-Authors" href="#Authors">3 Authors</a></li>
|
||
|
|
</ul>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div class="chapter-level-extent" id="Description">
|
||
|
|
<h2 class="chapter">1 Description</h2>
|
||
|
|
|
||
|
|
<p>The libswresample library performs highly optimized audio resampling,
|
||
|
|
rematrixing and sample format conversion operations.
|
||
|
|
</p>
|
||
|
|
<p>Specifically, this library performs the following conversions:
|
||
|
|
</p>
|
||
|
|
<ul class="itemize mark-bullet">
|
||
|
|
<li><em class="emph">Resampling</em>: 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.
|
||
|
|
|
||
|
|
</li><li><em class="emph">Format conversion</em>: 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").
|
||
|
|
|
||
|
|
</li><li><em class="emph">Rematrixing</em>: 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.
|
||
|
|
</li></ul>
|
||
|
|
|
||
|
|
<p>Various other audio conversions (e.g. stretching and padding) are
|
||
|
|
enabled through dedicated options.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
<div class="chapter-level-extent" id="See-Also">
|
||
|
|
<h2 class="chapter">2 See Also</h2>
|
||
|
|
|
||
|
|
<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>,
|
||
|
|
<a class="url" href="ffmpeg-resampler.html">ffmpeg-resampler</a>,
|
||
|
|
<a class="url" href="libavutil.html">libavutil</a>
|
||
|
|
</p>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
<div class="chapter-level-extent" id="Authors">
|
||
|
|
<h2 class="chapter">3 Authors</h2>
|
||
|
|
|
||
|
|
<p>The FFmpeg developers.
|
||
|
|
</p>
|
||
|
|
<p>For details about the authorship, see the Git history of the project
|
||
|
|
(https://git.ffmpeg.org/ffmpeg), e.g. by typing the command
|
||
|
|
<code class="command">git log</code> in the FFmpeg source directory, or browsing the
|
||
|
|
online repository at <a class="url" href="https://git.ffmpeg.org/ffmpeg">https://git.ffmpeg.org/ffmpeg</a>.
|
||
|
|
</p>
|
||
|
|
<p>Maintainers for the specific components are listed in the file
|
||
|
|
<samp class="file">MAINTAINERS</samp> in the source code tree.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|