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<h1>libtheora Documentation</h1><h3>1.1.0+svn </h3><h2><a class="anchor" id="intro">
Introduction</a></h2>
<p>This is the documentation for <code>libtheora</code> C API. The current reference implementation for <a href="http://www.theora.org/">Theora</a>, a free, patent-unencumbered video codec. Theora is derived from On2's VP3 codec with additional features and integration with Ogg multimedia formats by <a href="http://www.xiph.org/">the Xiph.Org Foundation</a>. Complete documentation of the format itself is available in <a href="http://www.theora.org/doc/Theora.pdf">the Theora specification</a>.</p>
<h3><a class="anchor" id="Organization">
Organization</a></h3>
<p>The functions documented here are actually subdivided into three separate libraries:</p>
<ul>
<li><code>libtheoraenc</code> contains the encoder interface, described in <a class="el" href="group__encfuncs.html">Functions for Encoding</a>.</li>
<li><code>libtheoradec</code> contains the decoder interface and routines shared with the encoder. You must also link to this if you link to <code>libtheoraenc</code>. The routines in this library are described in <a class="el" href="group__decfuncs.html">Functions for Decoding</a> and <a class="el" href="group__basefuncs.html">Functions Shared by Encode and Decode</a>.</li>
<li><code>libtheora</code> contains the <a class="el" href="group__oldfuncs.html">Legacy pre-1.0 C API</a>.</li>
</ul>
<p>New code should link to <code>libtheoradec</code> and, if using encoder features, <code>libtheoraenc</code>. Together these two export both the standard and the legacy API, so this is all that is needed by any code. The older <code>libtheora</code> library is provided just for compatibility with older build configurations.</p>
<p>In general the recommended 1.x API symbols can be distinguished by their <code>th_</code> or <code>TH_</code> namespace prefix. The older, legacy API uses <code>theora_</code> or <code>OC_</code> prefixes instead. </p>
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