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<div class="refentry">
<a name="gstreamer-plugins-multiqueue"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gstreamer-plugins-multiqueue.top_of_page"></a>multiqueue</span></h2>
<p>multiqueue</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gstreamer-plugins-multiqueue.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="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="gstreamer-plugins-multiqueue.html#GstMultiQueue--extra-size-buffers" title="The “extra-size-buffers” property">extra-size-buffers</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="gstreamer-plugins-multiqueue.html#GstMultiQueue--extra-size-bytes" title="The “extra-size-bytes” property">extra-size-bytes</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">guint64</span></td>
<td class="property_name"><a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue--extra-size-time" title="The “extra-size-time” property">extra-size-time</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#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue--high-percent" title="The “high-percent” property">high-percent</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#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue--low-percent" title="The “low-percent” property">low-percent</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="gstreamer-plugins-multiqueue.html#GstMultiQueue--max-size-buffers" title="The “max-size-buffers” property">max-size-buffers</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="gstreamer-plugins-multiqueue.html#GstMultiQueue--max-size-bytes" title="The “max-size-bytes” property">max-size-bytes</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">guint64</span></td>
<td class="property_name"><a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue--max-size-time" title="The “max-size-time” property">max-size-time</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#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue--sync-by-running-time" title="The “sync-by-running-time” property">sync-by-running-time</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#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue--use-buffering" title="The “use-buffering” property">use-buffering</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gstreamer-plugins-multiqueue.signals"></a><h2>Signals</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="signals_return">
<col width="300px" class="signals_name">
<col width="200px" class="signals_flags">
</colgroup>
<tbody>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue-overrun" title="The “overrun” signal">overrun</a></td>
<td class="signal_flags"><a href="https://developer.gnome.org/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS">Run First</a></td>
</tr>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue-underrun" title="The “underrun” signal">underrun</a></td>
<td class="signal_flags"><a href="https://developer.gnome.org/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS">Run First</a></td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstMultiQueue"></a><div class="refsect1">
<a name="gstreamer-plugins-multiqueue.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="gstreamer-plugins-multiqueue.html#GstMultiQueue-struct" title="struct GstMultiQueue">GstMultiQueue</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gstreamer-plugins-multiqueue.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> GstMultiQueue
</pre>
</div>
<div class="refsect1">
<a name="gstreamer-plugins-multiqueue.description"></a><h2>Description</h2>
<div class="refsect2">
<a name="id-1.2.13.8.2"></a><p>
Multiqueue is similar to a normal <a class="link" href="gstreamer-plugins-queue.html#GstQueue"><span class="type">GstQueue</span></a> with the following additional
features:
</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><div class="itemizedlist">
<p class="title"><b>Multiple streamhandling</b></p>
<ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
<p>
The element handles queueing data on more than one stream at once. To
achieve such a feature it has request sink pads (sinku) and
'sometimes' src pads (srcu).
</p>
<p>
When requesting a given sinkpad with <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#gst-element-request-pad"><code class="function">gst_element_request_pad()</code></a>,
the associated srcpad for that stream will be created.
Example: requesting sink1 will generate src1.
</p>
</li></ul>
</div></li>
<li class="listitem"><div class="itemizedlist">
<p class="title"><b>Non-starvation on multiple streams</b></p>
<ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
<p>
If more than one stream is used with the element, the streams' queues
will be dynamically grown (up to a limit), in order to ensure that no
stream is risking data starvation. This guarantees that at any given
time there are at least N bytes queued and available for each individual
stream.
</p>
<p>
If an EOS event comes through a srcpad, the associated queue will be
considered as 'not-empty' in the queue-size-growing algorithm.
</p>
</li></ul>
</div></li>
<li class="listitem"><div class="itemizedlist">
<p class="title"><b>Non-linked srcpads graceful handling</b></p>
<ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
<p>
In order to better support dynamic switching between streams, the multiqueue
(unlike the current GStreamer queue) continues to push buffers on non-linked
pads rather than shutting down.
</p>
<p>
In addition, to prevent a non-linked stream from very quickly consuming all
available buffers and thus 'racing ahead' of the other streams, the element
must ensure that buffers and inlined events for a non-linked stream are pushed
in the same order as they were received, relative to the other streams
controlled by the element. This means that a buffer cannot be pushed to a
non-linked pad any sooner than buffers in any other stream which were received
before it.
</p>
</li></ul>
</div></li>
</ol></div>
<p>
</p>
<p>
Data is queued until one of the limits specified by the
<a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue--max-size-buffers" title="The “max-size-buffers” property"><span class="type">“max-size-buffers”</span></a>, <a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue--max-size-bytes" title="The “max-size-bytes” property"><span class="type">“max-size-bytes”</span></a> and/or
<a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue--max-size-time" title="The “max-size-time” property"><span class="type">“max-size-time”</span></a> properties has been reached. Any attempt to push
more buffers into the queue will block the pushing thread until more space
becomes available. <a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue--extra-size-buffers" title="The “extra-size-buffers” property"><span class="type">“extra-size-buffers”</span></a>,
</p>
<p>
<a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue--extra-size-bytes" title="The “extra-size-bytes” property"><span class="type">“extra-size-bytes”</span></a> and <a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue--extra-size-time" title="The “extra-size-time” property"><span class="type">“extra-size-time”</span></a> are
currently unused.
</p>
<p>
The default queue size limits are 5 buffers, 10MB of data, or
two second worth of data, whichever is reached first. Note that the number
of buffers will dynamically grow depending on the fill level of
other queues.
</p>
<p>
The <a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue-underrun" title="The “underrun” signal"><span class="type">“underrun”</span></a> signal is emitted when all of the queues
are empty. The <a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue-overrun" title="The “overrun” signal"><span class="type">“overrun”</span></a> signal is emitted when one of the
queues is filled.
Both signals are emitted from the context of the streaming thread.
</p>
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.13.8.3.1"></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="gstreamer-plugins-plugin-coreelements.html#plugin-coreelements">coreelements</a>
</td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Edward Hervey &lt;edward@fluendo.com&gt;</td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Generic</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.13.8.3.2"></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>ANY</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_%u</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>sometimes</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>ANY</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gstreamer-plugins-multiqueue.functions_details"></a><h2>Functions</h2>
<p></p>
</div>
<div class="refsect1">
<a name="gstreamer-plugins-multiqueue.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstMultiQueue-struct"></a><h3>struct GstMultiQueue</h3>
<pre class="programlisting">struct GstMultiQueue;</pre>
<p>Opaque <a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue"><span class="type">GstMultiQueue</span></a> structure.</p>
</div>
</div>
<div class="refsect1">
<a name="gstreamer-plugins-multiqueue.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstMultiQueue--extra-size-buffers"></a><h3>The <code class="literal">“extra-size-buffers”</code> property</h3>
<pre class="programlisting"> “extra-size-buffers” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Amount of buffers the queues can grow if one of them is empty (0=disable) (NOT IMPLEMENTED).</p>
<p>Flags: Read / Write</p>
<p>Default value: 5</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMultiQueue--extra-size-bytes"></a><h3>The <code class="literal">“extra-size-bytes”</code> property</h3>
<pre class="programlisting"> “extra-size-bytes” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Amount of data the queues can grow if one of them is empty (bytes, 0=disable) (NOT IMPLEMENTED).</p>
<p>Flags: Read / Write</p>
<p>Default value: 10485760</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMultiQueue--extra-size-time"></a><h3>The <code class="literal">“extra-size-time”</code> property</h3>
<pre class="programlisting"> “extra-size-time” <span class="type">guint64</span></pre>
<p>Amount of time the queues can grow if one of them is empty (in ns, 0=disable) (NOT IMPLEMENTED).</p>
<p>Flags: Read / Write</p>
<p>Default value: 3000000000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMultiQueue--high-percent"></a><h3>The <code class="literal">“high-percent”</code> property</h3>
<pre class="programlisting"> “high-percent” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>High threshold percent for buffering to finish.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [0,100]</p>
<p>Default value: 99</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMultiQueue--low-percent"></a><h3>The <code class="literal">“low-percent”</code> property</h3>
<pre class="programlisting"> “low-percent” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Low threshold percent for buffering to start.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [0,100]</p>
<p>Default value: 10</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMultiQueue--max-size-buffers"></a><h3>The <code class="literal">“max-size-buffers”</code> property</h3>
<pre class="programlisting"> “max-size-buffers” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Max. number of buffers in the queue (0=disable).</p>
<p>Flags: Read / Write</p>
<p>Default value: 5</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMultiQueue--max-size-bytes"></a><h3>The <code class="literal">“max-size-bytes”</code> property</h3>
<pre class="programlisting"> “max-size-bytes” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Max. amount of data in the queue (bytes, 0=disable).</p>
<p>Flags: Read / Write</p>
<p>Default value: 10485760</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMultiQueue--max-size-time"></a><h3>The <code class="literal">“max-size-time”</code> property</h3>
<pre class="programlisting"> “max-size-time” <span class="type">guint64</span></pre>
<p>Max. amount of data in the queue (in ns, 0=disable).</p>
<p>Flags: Read / Write</p>
<p>Default value: 2000000000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMultiQueue--sync-by-running-time"></a><h3>The <code class="literal">“sync-by-running-time”</code> property</h3>
<pre class="programlisting"> “sync-by-running-time” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>If enabled multiqueue will synchronize deactivated or not-linked streams
to the activated and linked streams by taking the running time.
Otherwise multiqueue will synchronize the deactivated or not-linked
streams by keeping the order in which buffers and events arrived compared
to active and linked streams.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMultiQueue--use-buffering"></a><h3>The <code class="literal">“use-buffering”</code> property</h3>
<pre class="programlisting"> “use-buffering” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Enable the buffering option in multiqueue so that BUFFERING messages are
emitted based on low-/high-percent thresholds.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
</div>
<div class="refsect1">
<a name="gstreamer-plugins-multiqueue.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GstMultiQueue-overrun"></a><h3>The <code class="literal">“overrun”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue"><span class="type">GstMultiQueue</span></a> *multiqueue,
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data)</pre>
<p>Reports that one of the queues in the multiqueue is full (overrun).
A queue is full if the total amount of data inside it (num-buffers, time,
size) is higher than the boundary values which can be set through the
GObject properties.</p>
<p>This can be used as an indicator of pre-roll.</p>
<div class="refsect3">
<a name="id-1.2.13.12.2.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>multiqueue</p></td>
<td class="parameter_description"><p>the multiqueue instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: <a href="https://developer.gnome.org/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS">Run First</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstMultiQueue-underrun"></a><h3>The <code class="literal">“underrun”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="gstreamer-plugins-multiqueue.html#GstMultiQueue"><span class="type">GstMultiQueue</span></a> *multiqueue,
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data)</pre>
<p>This signal is emitted from the streaming thread when there is
no data in any of the queues inside the multiqueue instance (underrun).</p>
<p>This indicates either starvation or EOS from the upstream data sources.</p>
<div class="refsect3">
<a name="id-1.2.13.12.3.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>multiqueue</p></td>
<td class="parameter_description"><p>the multiqueue instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: <a href="https://developer.gnome.org/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS">Run First</a></p>
</div>
</div>
<div class="refsect1">
<a name="gstreamer-plugins-multiqueue.see-also"></a><h2>See Also</h2>
<p><a class="link" href="gstreamer-plugins-queue.html#GstQueue"><span class="type">GstQueue</span></a></p>
</div>
</div>
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