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<title>GStreamer Editing Services 1.2.1 Reference Manual: Overview and architecture</title>
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<div class="refentry">
<a name="ges-architecture"></a><div class="titlepage"></div>
<div class="refsect1">
<a name="id-1.2.4.2"></a><h2>Goals of GStreamer Editing Services</h2>
<p>The GStreamer multimedia framework and the accompanying GNonLin set
of plugins for non-linear editing offer all the building blocks for:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>Decoding and encoding to a wide variety of formats, through
all the available GStreamer plugins.</p></li>
<li class="listitem"><p>Easily choosing segments of streams and arranging them through
time through the GNonLin set of plugins.</p></li>
</ul></div>
<p>But all those building blocks only offer stream-level access, which
results in developers who want to write non-linear editors to write a
consequent amount of code to get to the level of <span class="emphasis"><em>non-linear
editing</em></span> notions which are closer and more meaningful for the
end-user (and therefore the application).</p>
<p>The GStreamer Editing Services <em><span class="remark">(hereafter GES)</span></em> aims
to fill the gap between GStreamer/GNonLin and the application developer by
offering a series of classes to simplify the creation of many kind of
editing-related applications.</p>
</div>
<div class="refsect1">
<a name="id-1.2.4.3"></a><h2>Architecture</h2>
<div class="refsect2">
<a name="id-1.2.4.3.2"></a><h3>Timeline and TimelinePipeline</h3>
<p>The most top-level object encapsulating every other object is the
<a class="link" href="GESTimeline.html" title="GESTimeline">GESTimeline</a>. It is the central object
for any editing project.</p>
<p>The <code class="classname">GESTimeline</code> is a
<code class="classname">GstElement</code>. It can therefore be used in any
GStreamer pipeline like any other object.</p>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.4.3.3"></a><h3>Tracks and Layers</h3>
<p>The GESTimeline can contain two types of objects (seen in <a class="xref" href="ges-architecture.html#layer_tracks_diagram" title="Figure 1. Layers and Tracks">Figure 1, “Layers and Tracks”</a>): </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>Layers - Corresponds to the user-visible arrangement of clips,
and what you primarily interact with as an application developer.
A minimalistic timeline would only have one layer,
but a more complex editing application could use as many as needed.
</p></li>
<li class="listitem"><p>Tracks - Corresponds to the output streams in GStreamer.
A typical GESTimeline, aimed at a video editing application, would
have an audio track and a video track.
A GESTimeline for an audio editing application would only require
an audio track. Multiple layers can be related to each track.</p></li>
</ul></div>
<div class="figure">
<a name="layer_tracks_diagram"></a><p class="title"><b>Figure 1. Layers and Tracks</b></p>
<div class="figure-contents"><div class="mediaobject"><img src="layer_track_overview.png" width="405" alt="Layers and Tracks"></div></div>
</div>
<br class="figure-break"><p>In order to reduce even more the amount of GStreamer interaction
the application developer has to deal with, a convenience GstPipeline
has been made available specifically for Timelines : <a class="link" href="GESPipeline.html" title="GESPipeline">GESPipeline</a>.</p>
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