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| <div class="refentry"> |
| <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="https://developer.gnome.org/glib/unstable/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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstCaps.html"><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="https://developer.gnome.org/glib/unstable/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="https://developer.gnome.org/glib/unstable/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="https://developer.gnome.org/glib/unstable/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="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a> |
| <span class="lineart">╰──</span> <a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a> |
| <span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a> |
| <span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a> |
| <span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-libs/html/gst-plugins-bad-libs-GstAggregator.html#GstAggregator">GstAggregator</a> |
| <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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstChildProxy.html">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="https://developer.gnome.org/glib/unstable/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="https://developer.gnome.org/glib/unstable/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="https://developer.gnome.org/glib/unstable/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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstCaps.html"><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="https://developer.gnome.org/glib/unstable/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="https://developer.gnome.org/glib/unstable/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="https://developer.gnome.org/glib/unstable/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> |
| </div> |
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