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<a name="gst-plugins-bad-plugins-audiomixer"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-bad-plugins-audiomixer.top_of_page"></a>audiomixer</span></h2>
<p>audiomixer</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-audiomixer.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" 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/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-audiomixer.html#GstAudioMixer--alignment-threshold" title="The “alignment-threshold” property">alignment-threshold</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-audiomixer.html#GstAudioMixer--caps" title="The “caps” property">caps</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-audiomixer.html#GstAudioMixer--discont-wait" title="The “discont-wait” property">discont-wait</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-audiomixer.html#GstAudioMixer--blocksize" title="The “blocksize” property">blocksize</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-audiomixer.html#GstAudioMixer--output-buffer-duration" title="The “output-buffer-duration” property">output-buffer-duration</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstAudioMixer"></a><div class="refsect1">
<a name="gst-plugins-bad-plugins-audiomixer.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" 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-bad-plugins-audiomixer.html#GstAudioMixer-struct" title="struct GstAudioMixer">GstAudioMixer</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-audiomixer.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-struct">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-struct">GstObject</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html#GstElement-struct">GstElement</a>
<span class="lineart">╰──</span> GstAggregator
<span class="lineart">╰──</span> GstAudioAggregator
<span class="lineart">╰──</span> GstAudioMixer
<span class="lineart">╰──</span> GstLiveAdder
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-audiomixer.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GstAudioMixer implements
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstChildProxy.html#GstChildProxy-struct">GstChildProxy</a>.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-audiomixer.description"></a><h2>Description</h2>
<p>The audiomixer 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>Unlike the adder element audiomixer properly synchronises all input streams.</p>
<p>The input pads are from a GstPad subclass and have additional
properties to mute each pad individually and set the volume:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
"mute": Whether to mute the pad or not (<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>)
</li>
<li class="listitem">
"volume": The volume of the pad, between 0.0 and 10.0 (<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a>)
</li>
</ul></div>
<div class="refsect2">
<a name="id-1.2.7.8.6"></a><h3>Example launch line</h3>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> audiotestsrc freq<span class="gtkdoc opt">=</span><span class="number">100</span> <span class="gtkdoc opt">!</span> audiomixer name<span class="gtkdoc opt">=</span>mix <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> alsasink audiotestsrc freq<span class="gtkdoc opt">=</span><span class="number">500</span> <span class="gtkdoc opt">!</span> mix<span class="gtkdoc opt">.</span></pre></td>
</tr>
</tbody>
</table>
</div>
This pipeline produces two sine waves mixed together.
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.7.8.7.1"></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-bad-plugins-plugin-audiomixer.html#plugin-audiomixer">audiomixer</a>
</td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Sebastian Dröge <sebastian@centricular.com></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-1.2.7.8.7.2"></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>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-audiomixer.functions_details"></a><h2>Functions</h2>
<p></p>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-audiomixer.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstAudioMixer-struct"></a><h3>struct GstAudioMixer</h3>
<pre class="programlisting">struct GstAudioMixer;</pre>
<p>The audiomixer object structure.</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-audiomixer.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstAudioMixer--alignment-threshold"></a><h3>The <code class="literal">“alignment-threshold”</code> property</h3>
<pre class="programlisting"> “alignment-threshold” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>Timestamp alignment threshold in nanoseconds.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: <= 18446744073709551614</p>
<p>Default value: 40000000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioMixer--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/GstCaps.html#GstCaps-struct"><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>
<hr>
<div class="refsect2">
<a name="GstAudioMixer--discont-wait"></a><h3>The <code class="literal">“discont-wait”</code> property</h3>
<pre class="programlisting"> “discont-wait” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>Window of time in nanoseconds to wait before creating a discontinuity.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: <= 18446744073709551614</p>
<p>Default value: 1000000000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioMixer--blocksize"></a><h3>The <code class="literal">“blocksize”</code> property</h3>
<pre class="programlisting"> “blocksize” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Output block size in number of samples.</p>
<p>Flags: Read / Write</p>
<p>Default value: 1024</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioMixer--output-buffer-duration"></a><h3>The <code class="literal">“output-buffer-duration”</code> property</h3>
<pre class="programlisting"> “output-buffer-duration” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>Output block size in nanoseconds.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= 1</p>
<p>Default value: 10000000</p>
</div>
</div>
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