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<title>GStreamer Base Plugins 1.0 Plugins Reference Manual: adder</title>
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<a name="gst-plugins-base-plugins-adder"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gst-plugins-base-plugins-adder.top_of_page"></a>adder</span></h2>
<p>adder — Add N audio channels together</p>
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<td class="gallery_image" valign="top" align="right"></td>
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<div class="refsect1">
<a name="gst-plugins-base-plugins-adder.properties"></a><h2>Properties</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody><tr>
<td class="property_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-adder.html#GstAdder--caps" title="The “caps” property">caps</a></td>
<td class="property_flags">Read / Write</td>
</tr></tbody>
</table></div>
</div>
<a name="GstAdder"></a><div class="refsect1">
<a name="gst-plugins-base-plugins-adder.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-base-plugins-adder.html#GstAdder-struct" title="struct GstAdder">GstAdder</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-adder.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html">GstObject</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html">GstElement</a>
<span class="lineart">╰──</span> GstAdder
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-adder.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GstAdder implements
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstChildProxy.html">GstChildProxy</a>.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-adder.description"></a><h2>Description</h2>
<p>The adder allows to mix several streams into one by adding the data.
Mixed data is clamped to the min/max values of the data format.</p>
<p>The adder currently mixes all data received on the sinkpads as soon as
possible without trying to synchronize the streams.</p>
<div class="refsect2">
<a name="id-1.2.2.8.4"></a><h3>Example launch line</h3>
<div class="informalexample"><pre class="programlisting">
gst-launch audiotestsrc freq=100 ! adder name=mix ! audioconvert ! alsasink audiotestsrc freq=500 ! mix.
</pre></div> This pipeline produces two sine waves mixed together.
</div>
<p>Last reviewed on 2006-05-09 (0.10.7)</p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.2.8.5.1.1"></a><h3>Element Information</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">plugin</span></p></td>
<td>
<a class="link" href="gst-plugins-base-plugins-plugin-adder.html#plugin-adder">adder</a>
</td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Thomas Vander Stichele <thomas at apestaart dot org></td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Generic/Audio</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.2.8.5.1.2"></a><h3>Element Pads</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>sink_%u</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>request</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>audio/x-raw, format=(string){ S32LE, U32LE, S16LE, U16LE, S8, U8, F32LE, F64LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string){ interleaved, non-interleaved }</td>
</tr>
</tbody>
</table></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>src</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>source</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>audio/x-raw, format=(string){ S32LE, U32LE, S16LE, U16LE, S8, U8, F32LE, F64LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string){ interleaved, non-interleaved }</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-adder.functions_details"></a><h2>Functions</h2>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-adder.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstAdder-struct"></a><h3>struct GstAdder</h3>
<pre class="programlisting">struct GstAdder;</pre>
<p>The adder object structure.</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-adder.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstAdder--caps"></a><h3>The <code class="literal">“caps”</code> property</h3>
<pre class="programlisting"> “caps” <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *</pre>
<p>Set target format for mixing (NULL means ANY). Setting this property takes a reference to the supplied GstCaps object.</p>
<p>Flags: Read / Write</p>
</div>
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