gstreamer1.0-plugins-good-doc 1.8.0-1ubuntu1 / usr / share / gtk-doc / html / gst-plugins-good-plugins-1.0 / gst-plugins-good-plugins-rtpjitterbuffer.html

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
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<title>rtpjitterbuffer: GStreamer Good Plugins 1.0 Plugins Reference Manual</title>
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                  <a href="#gst-plugins-good-plugins-rtpjitterbuffer.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_properties">  <span class="dim">|</span> 
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<a name="gst-plugins-good-plugins-rtpjitterbuffer"></a><div class="titlepage"></div>
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<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-rtpjitterbuffer.top_of_page"></a>rtpjitterbuffer</span></h2>
<p>rtpjitterbuffer</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtpjitterbuffer.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#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--do-lost" title="The “do-lost” property">do-lost</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#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--drop-on-latency" title="The “drop-on-latency” property">drop-on-latency</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-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--latency" title="The “latency” property">latency</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#gint64"><span class="type">gint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--ts-offset" title="The “ts-offset” property">ts-offset</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a class="link" href="gst-plugins-good-plugins-rtpbin.html#RTPJitterBufferMode" title="enum RTPJitterBufferMode"><span class="type">RTPJitterBufferMode</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--mode" title="The “mode” property">mode</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#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--percent" title="The “percent” property">percent</a></td>
<td class="property_flags">Read</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--do-retransmission" title="The “do-retransmission” property">do-retransmission</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#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-delay" title="The “rtx-delay” property">rtx-delay</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#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-delay-reorder" title="The “rtx-delay-reorder” property">rtx-delay-reorder</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#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-retry-period" title="The “rtx-retry-period” property">rtx-retry-period</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#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-retry-timeout" title="The “rtx-retry-timeout” property">rtx-retry-timeout</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/GstStructure.html"><span class="type">GstStructure</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--stats" title="The “stats” property">stats</a></td>
<td class="property_flags">Read</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-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-min-delay" title="The “rtx-min-delay” property">rtx-min-delay</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#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-min-retry-timeout" title="The “rtx-min-retry-timeout” property">rtx-min-retry-timeout</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#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-max-retries" title="The “rtx-max-retries” property">rtx-max-retries</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#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-next-seqnum" title="The “rtx-next-seqnum” property">rtx-next-seqnum</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-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--max-dropout-time" title="The “max-dropout-time” property">max-dropout-time</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-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--max-misorder-time" title="The “max-misorder-time” property">max-misorder-time</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#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--max-rtcp-rtp-time-diff" title="The “max-rtcp-rtp-time-diff” property">max-rtcp-rtp-time-diff</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtpjitterbuffer.signals"></a><h2>Signals</h2>
<div class="informaltable"><table class="informaltable" 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="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer-clear-pt-map" title="The “clear-pt-map” signal">clear-pt-map</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></td>
</tr>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer-handle-sync" title="The “handle-sync” signal">handle-sync</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer-on-npt-stop" title="The “on-npt-stop” signal">on-npt-stop</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
<tr>
<td class="signal_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html"><span class="returnvalue">GstCaps</span></a>*</td>
<td class="signal_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer-request-pt-map" title="The “request-pt-map” signal">request-pt-map</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
<tr>
<td class="signal_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a></td>
<td class="signal_name"><a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer-set-active" title="The “set-active” signal">set-active</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstRtpJitterBuffer"></a><div class="refsect1">
<a name="gst-plugins-good-plugins-rtpjitterbuffer.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-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer-struct" title="struct GstRtpJitterBuffer">GstRtpJitterBuffer</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtpjitterbuffer.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> GstRtpJitterBuffer
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtpjitterbuffer.description"></a><h2>Description</h2>
<p>This element reorders and removes duplicate RTP packets as they are received
from a network source.</p>
<p>The element needs the clock-rate of the RTP payload in order to estimate the
delay. This information is obtained either from the caps on the sink pad or,
when no caps are present, from the <a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer-request-pt-map" title="The “request-pt-map” signal"><span class="type">“request-pt-map”</span></a> signal.
To clear the previous pt-map use the <a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer-clear-pt-map" title="The “clear-pt-map” signal"><span class="type">“clear-pt-map”</span></a> signal.</p>
<p>The rtpjitterbuffer will wait for missing packets up to a configurable time
limit using the <a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--latency" title="The “latency” property"><span class="type">“latency”</span></a> property. Packets arriving too
late are considered to be lost packets. If the <a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--do-lost" title="The “do-lost” property"><span class="type">“do-lost”</span></a>
property is set, lost packets will result in a custom serialized downstream
event of name GstRTPPacketLost. The lost packet events are usually used by a
depayloader or other element to create concealment data or some other logic
to gracefully handle the missing packets.</p>
<p>The jitterbuffer will use the DTS (or PTS if no DTS is set) of the incomming
buffer and the rtptime inside the RTP packet to create a PTS on the outgoing
buffer.</p>
<p>The jitterbuffer can also be configured to send early retransmission events
upstream by setting the <a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--do-retransmission" title="The “do-retransmission” property"><span class="type">“do-retransmission”</span></a> property. In
this mode, the jitterbuffer tries to estimate when a packet should arrive and
sends a custom upstream event named GstRTPRetransmissionRequest when the
packet is considered late. The initial expected packet arrival time is
calculated as follows:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>If seqnum N arrived at time T, seqnum N+1 is expected to arrive at
T + packet-spacing + <a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-delay" title="The “rtx-delay” property"><span class="type">“rtx-delay”</span></a>. The packet spacing is
calculated from the DTS (or PTS is no DTS) of two consecutive RTP
packets with different rtptime.</p></li>
<li class="listitem"><p>If seqnum N0 arrived at time T0 and seqnum Nm arrived at time Tm,
seqnum Ni is expected at time Ti = T0 + i*(Tm - T0)/(Nm - N0). Any
previously scheduled timeout is overwritten.</p></li>
<li class="listitem"><p>If seqnum N arrived, all seqnum older than
N - <a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-delay-reorder" title="The “rtx-delay-reorder” property"><span class="type">“rtx-delay-reorder”</span></a> are considered late
immediately. This is to request fast feedback for abonormally reorder
packets before any of the previous timeouts is triggered.</p></li>
</ul></div>
<p>A late packet triggers the GstRTPRetransmissionRequest custom upstream
event. After the initial timeout expires and the retransmission event is
sent, the timeout is scheduled for
T + <a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-retry-timeout" title="The “rtx-retry-timeout” property"><span class="type">“rtx-retry-timeout”</span></a>. If the missing packet did not
arrive after <a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-retry-timeout" title="The “rtx-retry-timeout” property"><span class="type">“rtx-retry-timeout”</span></a>, a new
GstRTPRetransmissionRequest is sent upstream and the timeout is rescheduled
again for T + <a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-retry-timeout" title="The “rtx-retry-timeout” property"><span class="type">“rtx-retry-timeout”</span></a>. This repeats until
<a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--rtx-retry-period" title="The “rtx-retry-period” property"><span class="type">“rtx-retry-period”</span></a> elapsed, at which point no further
retransmission requests are sent and the regular logic is performed to
schedule a lost packet as discussed above.</p>
<p>This element acts as a live element and so adds <a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer--latency" title="The “latency” property"><span class="type">“latency”</span></a>
to the pipeline.</p>
<p>This element will automatically be used inside rtpbin.</p>
<div class="refsect2">
<a name="id-1.2.134.8.11"></a><h3>Example pipelines</h3>
<div class="informalexample"><pre class="programlisting">
gst-launch-1.0 rtspsrc location=rtsp://192.168.1.133:8554/mpeg1or2AudioVideoTest ! rtpjitterbuffer ! rtpmpvdepay ! mpeg2dec ! xvimagesink
</pre></div> Connect to a streaming server and decode the MPEG video. The jitterbuffer is
inserted into the pipeline to smooth out network jitter and to reorder the
out-of-order RTP packets.
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.134.8.12.1"></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-good-plugins-plugin-rtpmanager.html#plugin-rtpmanager">rtpmanager</a>
          </td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Philippe Kalaf &lt;philippe.kalaf@collabora.co.uk&gt;, Wim Taymans &lt;wim.taymans@gmail.com&gt;</td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Filter/Network/RTP</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.134.8.12.2"></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</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>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>application/x-rtp</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>sink_rtcp</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>application/x-rtcp</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>application/x-rtp</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtpjitterbuffer.functions_details"></a><h2>Functions</h2>
<p></p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtpjitterbuffer.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstRtpJitterBuffer-struct"></a><h3>struct GstRtpJitterBuffer</h3>
<pre class="programlisting">struct GstRtpJitterBuffer;</pre>
<p>Opaque jitterbuffer structure.</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtpjitterbuffer.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstRtpJitterBuffer--do-lost"></a><h3>The <code class="literal">“do-lost”</code> property</h3>
<pre class="programlisting">  “do-lost”                  <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Send out a GstRTPPacketLost event downstream when a packet is considered
lost.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--drop-on-latency"></a><h3>The <code class="literal">“drop-on-latency”</code> property</h3>
<pre class="programlisting">  “drop-on-latency”          <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Drop oldest buffers when the queue is completely filled.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--latency"></a><h3>The <code class="literal">“latency”</code> property</h3>
<pre class="programlisting">  “latency”                  <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>The maximum latency of the jitterbuffer. Packets will be kept in the buffer
for at most this time.</p>
<p>Flags: Read / Write</p>
<p>Default value: 200</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--ts-offset"></a><h3>The <code class="literal">“ts-offset”</code> property</h3>
<pre class="programlisting">  “ts-offset”                <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></pre>
<p>Adjust GStreamer output buffer timestamps in the jitterbuffer with offset.
This is mainly used to ensure interstream synchronisation.</p>
<p>Flags: Read / Write</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--mode"></a><h3>The <code class="literal">“mode”</code> property</h3>
<pre class="programlisting">  “mode”                     <a class="link" href="gst-plugins-good-plugins-rtpbin.html#RTPJitterBufferMode" title="enum RTPJitterBufferMode"><span class="type">RTPJitterBufferMode</span></a></pre>
<p>Control the buffering and timestamping mode used by the jitterbuffer.</p>
<p>Flags: Read / Write</p>
<p>Default value: Slave receiver to sender clock</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--percent"></a><h3>The <code class="literal">“percent”</code> property</h3>
<pre class="programlisting">  “percent”                  <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>The percent of the jitterbuffer that is filled.</p>
<p>Flags: Read</p>
<p>Allowed values: [0,100]</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--do-retransmission"></a><h3>The <code class="literal">“do-retransmission”</code> property</h3>
<pre class="programlisting">  “do-retransmission”        <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Send out a GstRTPRetransmission event upstream when a packet is considered
late and should be retransmitted.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--rtx-delay"></a><h3>The <code class="literal">“rtx-delay”</code> property</h3>
<pre class="programlisting">  “rtx-delay”                <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>When a packet did not arrive at the expected time, wait this extra amount
of time before sending a retransmission event.</p>
<p>When -1 is used, the max jitter will be used as extra delay.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= G_MAXULONG</p>
<p>Default value: -1</p>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--rtx-delay-reorder"></a><h3>The <code class="literal">“rtx-delay-reorder”</code> property</h3>
<pre class="programlisting">  “rtx-delay-reorder”        <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Assume that a retransmission event should be sent when we see
this much packet reordering.</p>
<p>When -1 is used, the value will be estimated based on observed packet
reordering.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= G_MAXULONG</p>
<p>Default value: 3</p>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--rtx-retry-period"></a><h3>The <code class="literal">“rtx-retry-period”</code> property</h3>
<pre class="programlisting">  “rtx-retry-period”         <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>The amount of time to try to get a retransmission.</p>
<p>When -1 is used, the value will be estimated based on the jitterbuffer
latency and the observed round trip time.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= G_MAXULONG</p>
<p>Default value: -1</p>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--rtx-retry-timeout"></a><h3>The <code class="literal">“rtx-retry-timeout”</code> property</h3>
<pre class="programlisting">  “rtx-retry-timeout”        <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Retry sending a transmission event after this timeout in ms (-1 automatic).</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= G_MAXULONG</p>
<p>Default value: -1</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--stats"></a><h3>The <code class="literal">“stats”</code> property</h3>
<pre class="programlisting">  “stats”                    <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstStructure.html"><span class="type">GstStructure</span></a> *</pre>
<p>Various jitterbuffer statistics. This property returns a GstStructure
with name application/x-rtp-jitterbuffer-stats with the following fields:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
  <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a>
  <code class="classname">"rtx-count"</code>:
  the number of retransmissions requested.
  </p></li>
<li class="listitem"><p>
  <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a>
  <code class="classname">"rtx-success-count"</code>:
  the number of successful retransmissions.
  </p></li>
<li class="listitem"><p>
  <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a>
  <code class="classname">"rtx-per-packet"</code>:
  average number of RTX per packet.
  </p></li>
<li class="listitem"><p>
  <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a>
  <code class="classname">"rtx-rtt"</code>:
  average round trip time per RTX.
  </p></li>
</ul></div>
<p>Flags: Read</p>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--rtx-min-delay"></a><h3>The <code class="literal">“rtx-min-delay”</code> property</h3>
<pre class="programlisting">  “rtx-min-delay”            <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>When a packet did not arrive at the expected time, wait at least this extra amount
of time before sending a retransmission event.</p>
<p>Flags: Read / Write</p>
<p>Default value: 0</p>
<p class="since">Since: 1.6</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--rtx-min-retry-timeout"></a><h3>The <code class="literal">“rtx-min-retry-timeout”</code> property</h3>
<pre class="programlisting">  “rtx-min-retry-timeout”    <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Minimum timeout between sending a transmission event in ms (-1 automatic).</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= G_MAXULONG</p>
<p>Default value: -1</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--rtx-max-retries"></a><h3>The <code class="literal">“rtx-max-retries”</code> property</h3>
<pre class="programlisting">  “rtx-max-retries”          <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>The maximum number of retries to request a retransmission.</p>
<p>This implies that as maximum (rtx-max-retries + 1) retransmissions will be requested.
When -1 is used, the number of retransmission request will not be limited.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= G_MAXULONG</p>
<p>Default value: -1</p>
<p class="since">Since: 1.6</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--rtx-next-seqnum"></a><h3>The <code class="literal">“rtx-next-seqnum”</code> property</h3>
<pre class="programlisting">  “rtx-next-seqnum”          <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Estimate when the next packet should arrive and schedule a retransmission
request for it.
This is, when packet N arrives, a GstRTPRetransmission event is schedule
for packet N+1. So it will be requested if it does not arrive at the expected time.
The expected time is calculated using the dts of N and the packet spacing.</p>
<p>Flags: Read / Write</p>
<p>Default value: TRUE</p>
<p class="since">Since: 1.6</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--max-dropout-time"></a><h3>The <code class="literal">“max-dropout-time”</code> property</h3>
<pre class="programlisting">  “max-dropout-time”         <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>The maximum time (milliseconds) of missing packets tolerated.</p>
<p>Flags: Read / Write</p>
<p>Default value: 60000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--max-misorder-time"></a><h3>The <code class="literal">“max-misorder-time”</code> property</h3>
<pre class="programlisting">  “max-misorder-time”        <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>The maximum time (milliseconds) of misordered packets tolerated.</p>
<p>Flags: Read / Write</p>
<p>Default value: 2000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer--max-rtcp-rtp-time-diff"></a><h3>The <code class="literal">“max-rtcp-rtp-time-diff”</code> property</h3>
<pre class="programlisting">  “max-rtcp-rtp-time-diff”   <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>The maximum amount of time in ms that the RTP time in the RTCP SRs
is allowed to be ahead of the last RTP packet we received. Use
-1 to disable ignoring of RTCP packets.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= G_MAXULONG</p>
<p>Default value: 1000</p>
<p class="since">Since: 1.8</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtpjitterbuffer.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GstRtpJitterBuffer-clear-pt-map"></a><h3>The <code class="literal">“clear-pt-map”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer"><span class="type">GstRtpJitterBuffer</span></a> *buffer,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>            user_data)</pre>
<p>Invalidate the clock-rate as obtained with the
<a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer-request-pt-map" title="The “request-pt-map” signal"><span class="type">“request-pt-map”</span></a> signal.</p>
<div class="refsect3">
<a name="id-1.2.134.12.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>buffer</p></td>
<td class="parameter_description"><p>the object which received the signal</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="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer-handle-sync"></a><h3>The <code class="literal">“handle-sync”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer"><span class="type">GstRtpJitterBuffer</span></a> *buffer,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstStructure.html"><span class="type">GstStructure</span></a>       *struct,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>            user_data)</pre>
<p>Be notified of new sync values.</p>
<div class="refsect3">
<a name="id-1.2.134.12.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>buffer</p></td>
<td class="parameter_description"><p>the object which received the signal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>struct</p></td>
<td class="parameter_description"><p>a GstStructure containing sync values.</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="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer-on-npt-stop"></a><h3>The <code class="literal">“on-npt-stop”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer"><span class="type">GstRtpJitterBuffer</span></a> *buffer,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>            user_data)</pre>
<p>Signal that the jitterbufer has pushed the RTP packet that corresponds to
the npt-stop position.</p>
<div class="refsect3">
<a name="id-1.2.134.12.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>buffer</p></td>
<td class="parameter_description"><p>the object which received the signal</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="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer-request-pt-map"></a><h3>The <code class="literal">“request-pt-map”</code> signal</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html"><span class="returnvalue">GstCaps</span></a>*
user_function (<a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer"><span class="type">GstRtpJitterBuffer</span></a> *buffer,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a>               pt,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>            user_data)</pre>
<p>Request the payload type as <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html"><span class="type">GstCaps</span></a> for <em class="parameter"><code>pt</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.134.12.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>buffer</p></td>
<td class="parameter_description"><p>the object which received the signal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pt</p></td>
<td class="parameter_description"><p>the pt</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="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpJitterBuffer-set-active"></a><h3>The <code class="literal">“set-active”</code> signal</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a>
user_function (<a class="link" href="gst-plugins-good-plugins-rtpjitterbuffer.html#GstRtpJitterBuffer"><span class="type">GstRtpJitterBuffer</span></a> *buffer,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>            Returns,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a>             arg2,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>            user_data)</pre>
<p>Start pushing out packets with the given base time. This signal is only
useful in buffering mode.</p>
<div class="refsect3">
<a name="id-1.2.134.12.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>buffer</p></td>
<td class="parameter_description"><p>the object which received the signal</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>
<div class="refsect3">
<a name="id-1.2.134.12.6.6"></a><h4>Returns</h4>
<p> the time of the last pushed packet.</p>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></p>
</div>
</div>
</div>
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