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<div class="chapter">
<div class="titlepage"><div><div><h1 class="title">
<a name="implementing-media-engines"></a>Implementing Rygel Media Engines</h1></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="section"><a href="implementing-media-engines.html#implementing-media-engines-overview">Implementing Media Engines: Overview</a></span></dt>
<dt><span class="section"><a href="implementing-media-engines-full-example.html">Implementing Media Engines: Full Example</a></span></dt>
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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="implementing-media-engines-overview"></a>Implementing Media Engines: Overview</h2></div></div></div>
<p>
This library may be used to create Rygel media engines by
implementing the <a class="link" href="RygelMediaEngine.html" title="RygelMediaEngine">RygelMediaEngine</a> class.
Rygel media engines contain knowledge about the streaming and (optionally) the
transcoding and seeking capabilites of the media library in use.</p>
<p>The actual media engine used by Rygel at runtime is specified
by the media-engine configuration key. For instance, in <code class="literal">rygel.conf</code>:
<code class="code">media-engine=librygel-media-engine-gst.so</code>
</p>
<p>A media engines should derive its own <a class="link" href="RygelDataSource.html" title="RygelDataSource">RygelDataSource</a>,
returning an instance of it from its create_data_source() implementation.</p>
<p>Optionally, a derived RygelMediaEngine may implement the get_dlna_profiles() and get_transcoders() virtual functions.</p>
<p>Rygel itself provides two media engines:
</p>
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</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><p><a class="ulink" href="http://git.gnome.org/browse/rygel/tree/src/media-engines/gstreamer" target="_top">gstreamer</a>: A media engine that uses GStreamer for transcoding and seeking.</p></li>
<li class="listitem"><p><a class="ulink" href="http://git.gnome.org/browse/rygel/tree/src/media-engines/simple" target="_top">simple</a>: A media engine that uses no multimedia framework, and therefore offers no transcoding or time-based seeking.</p></li>
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