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| <h2 class="contents-heading">Table of Contents</h2> |
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| <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> |
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| <div class="chapter-level-extent" id="Description"> |
| <h2 class="chapter">1 Description</h2> |
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| <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. |
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| </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"). |
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| </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> |
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| <p>Various other audio conversions (e.g. stretching and padding) are |
| enabled through dedicated options. |
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| <div class="chapter-level-extent" id="See-Also"> |
| <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>, |
| <a class="url" href="ffmpeg-resampler.html">ffmpeg-resampler</a>, |
| <a class="url" href="libavutil.html">libavutil</a> |
| </p> |
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| <div class="chapter-level-extent" id="Authors"> |
| <h2 class="chapter">3 Authors</h2> |
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| <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. |
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