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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="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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</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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<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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