106 lines
3.5 KiB
HTML
106 lines
3.5 KiB
HTML
<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.0.1, https://www.gnu.org/software/texinfo/ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>Libswresample Documentation</title>
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<meta name="description" content="Libswresample Documentation">
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<meta name="keywords" content="Libswresample Documentation">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<link href="#SEC_Contents" rel="contents" title="Table of Contents">
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<style type="text/css">
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ul.mark-bullet {list-style-type: disc}
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</head>
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<body lang="en">
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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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<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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</body>
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</html>
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