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<div class="refentry">
<a name="gst-plugins-good-plugins-rtprtxreceive"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-rtprtxreceive.top_of_page"></a>rtprtxreceive</span></h2>
<p>rtprtxreceive</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxreceive.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#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtprtxreceive.html#GstRtpRtxReceive--num-rtx-requests" title="The “num-rtx-requests” property">num-rtx-requests</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-rtprtxreceive.html#GstRtpRtxReceive--num-rtx-packets" title="The “num-rtx-packets” property">num-rtx-packets</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-rtprtxreceive.html#GstRtpRtxReceive--num-rtx-assoc-packets" title="The “num-rtx-assoc-packets” property">num-rtx-assoc-packets</a></td>
<td class="property_flags">Read</td>
</tr>
<tr>
<td class="property_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstStructure.html#GstStructure-struct"><span class="type">GstStructure</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtprtxreceive.html#GstRtpRtxReceive--payload-type-map" title="The “payload-type-map” property">payload-type-map</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstRtpRtxReceive"></a><div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxreceive.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-rtprtxreceive.html#GstRtpRtxReceive-struct" title="struct GstRtpRtxReceive">GstRtpRtxReceive</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxreceive.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> GstRtpRtxReceive
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxreceive.description"></a><h2>Description</h2>
<p>The receiver will listen to the custom retransmission events from the
downstream jitterbuffer and will remember the SSRC1 of the stream and
seqnum that was requested. When it sees a packet with one of the stored
seqnum, it associates the SSRC2 of the stream with the SSRC1 of the
master stream. From then it knows that SSRC2 is the retransmission
stream of SSRC1. This algorithm is stated in RFC 4588. For this
algorithm to work, RFC4588 also states that no two pending retransmission
requests can exist for the same seqnum and different SSRCs or else it
would be impossible to associate the retransmission with the original
requester SSRC.
When the RTX receiver has associated the retransmission packets,
it can depayload and forward them to the source pad of the element.
RTX is SSRC-multiplexed. See <a class="link" href="gst-plugins-good-plugins-rtprtxsend.html#GstRtpRtxSend"><span class="type">GstRtpRtxSend</span></a></p>
<div class="refsect2">
<a name="id-1.2.201.7.3"></a><h3>Example pipelines</h3>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6</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> rtpsession name<span class="gtkdoc opt">=</span>rtpsession \
audiotestsrc <span class="gtkdoc opt">!</span> speexenc <span class="gtkdoc opt">!</span> rtpspeexpay pt<span class="gtkdoc opt">=</span><span class="number">97</span> <span class="gtkdoc opt">!</span> rtprtxsend rtx<span class="gtkdoc opt">-</span>payload<span class="gtkdoc opt">-</span>type<span class="gtkdoc opt">=</span><span class="number">99</span> <span class="gtkdoc opt">!</span> \
identity drop<span class="gtkdoc opt">-</span>probability<span class="gtkdoc opt">=</span><span class="number">0.1</span> <span class="gtkdoc opt">!</span> rtpsession<span class="gtkdoc opt">.</span>send_rtp_sink \
rtpsession<span class="gtkdoc opt">.</span>send_rtp_src <span class="gtkdoc opt">!</span> udpsink host<span class="gtkdoc opt">=</span><span class="string">"127.0.0.1"</span> port<span class="gtkdoc opt">=</span><span class="number">5000</span> \
udpsrc port<span class="gtkdoc opt">=</span><span class="number">5001</span> <span class="gtkdoc opt">!</span> rtpsession<span class="gtkdoc opt">.</span>recv_rtcp_sink \
rtpsession<span class="gtkdoc opt">.</span>send_rtcp_src <span class="gtkdoc opt">!</span> udpsink host<span class="gtkdoc opt">=</span><span class="string">"127.0.0.1"</span> port<span class="gtkdoc opt">=</span><span class="number">5002</span> sync<span class="gtkdoc opt">=</span><span class="keyword">false</span> async<span class="gtkdoc opt">=</span><span class="keyword">false</span></pre></td>
</tr>
</tbody>
</table>
</div>
Send audio stream through port 5000. (5001 and 5002 are just the rtcp link with the receiver)
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7</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> rtpsession name<span class="gtkdoc opt">=</span>rtpsession \
udpsrc port<span class="gtkdoc opt">=</span><span class="number">5000</span> caps<span class="gtkdoc opt">=</span><span class="string">"application/x-rtp,media=(string)audio,clock-rate=(int)44100,encoding-name=(string)SPEEX,encoding-params=(string)1,octet-align=(string)1"</span> <span class="gtkdoc opt">!</span> \
rtpsession<span class="gtkdoc opt">.</span>recv_rtp_sink \
rtpsession<span class="gtkdoc opt">.</span>recv_rtp_src <span class="gtkdoc opt">!</span> rtprtxreceive rtx<span class="gtkdoc opt">-</span>payload<span class="gtkdoc opt">-</span>types<span class="gtkdoc opt">=</span><span class="string">"99"</span> <span class="gtkdoc opt">!</span> rtpjitterbuffer <span class="keyword">do</span><span class="gtkdoc opt">-</span>retransmission<span class="gtkdoc opt">=</span><span class="keyword">true</span> <span class="gtkdoc opt">!</span> rtpspeexdepay <span class="gtkdoc opt">!</span> \
speexdec <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> autoaudiosink \
rtpsession<span class="gtkdoc opt">.</span>send_rtcp_src <span class="gtkdoc opt">!</span> udpsink host<span class="gtkdoc opt">=</span><span class="string">"127.0.0.1"</span> port<span class="gtkdoc opt">=</span><span class="number">5001</span> \
udpsrc port<span class="gtkdoc opt">=</span><span class="number">5002</span> <span class="gtkdoc opt">!</span> rtpsession<span class="gtkdoc opt">.</span>recv_rtcp_sink sync<span class="gtkdoc opt">=</span>fakse async<span class="gtkdoc opt">=</span><span class="keyword">false</span></pre></td>
</tr>
</tbody>
</table>
</div>
Receive audio stream from port 5000. (5001 and 5002 are just the rtcp link with the sender)
On sender side make sure to use a different payload type for the stream and
its associated retransmission stream (see <a class="link" href="gst-plugins-good-plugins-rtprtxsend.html#GstRtpRtxSend"><span class="type">GstRtpRtxSend</span></a>). Note that several retransmission streams can
have the same payload type so this is not deterministic. Actually the
rtprtxreceiver element does the association using seqnum values.
On receiver side set all the retransmission payload types (Those informations are retrieve
through SDP).
You should still hear a clear sound when setting drop-probability to something greater than 0.
The rtpjitterbuffer will generate a custom upstream event GstRTPRetransmissionRequest when
it assumes that one packet is missing. Then this request is translated to a FB NACK in the rtcp link
Finally the rtpsession of the sender side re-convert it in a GstRTPRetransmissionRequest that will
be handle by rtprtxsend.
When increasing this value it may be possible that even the retransmission stream would be dropped
so the receiver will ask to resend the packets again and again until it actually receive them.
If the value is too high the rtprtxsend will not be able to retrieve the packet in its list of
stored packets. For learning purpose you could try to increase the max-size-packets or max-size-time
rtprtxsender's properties.
Also note that you should use rtprtxsend through rtpbin and its set-aux-send property. See <a class="link" href="gst-plugins-good-plugins-rtpbin.html#GstRtpBin"><span class="type">GstRtpBin</span></a>.
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12</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> rtpsession name<span class="gtkdoc opt">=</span>rtpsession0 \
audiotestsrc wave<span class="gtkdoc opt">=</span><span class="number">0</span> <span class="gtkdoc opt">!</span> speexenc <span class="gtkdoc opt">!</span> rtpspeexpay pt<span class="gtkdoc opt">=</span><span class="number">97</span> <span class="gtkdoc opt">!</span> rtprtxsend rtx<span class="gtkdoc opt">-</span>payload<span class="gtkdoc opt">-</span>type<span class="gtkdoc opt">=</span><span class="number">99</span> seqnum<span class="gtkdoc opt">-</span>offset<span class="gtkdoc opt">=</span><span class="number">1</span> <span class="gtkdoc opt">!</span> \
identity drop<span class="gtkdoc opt">-</span>probability<span class="gtkdoc opt">=</span><span class="number">0.1</span> <span class="gtkdoc opt">!</span> rtpsession0<span class="gtkdoc opt">.</span>send_rtp_sink \
rtpsession0<span class="gtkdoc opt">.</span>send_rtp_src <span class="gtkdoc opt">!</span> udpsink host<span class="gtkdoc opt">=</span><span class="string">"127.0.0.1"</span> port<span class="gtkdoc opt">=</span><span class="number">5000</span> \
udpsrc port<span class="gtkdoc opt">=</span><span class="number">5001</span> <span class="gtkdoc opt">!</span> rtpsession0<span class="gtkdoc opt">.</span>recv_rtcp_sink \
rtpsession0<span class="gtkdoc opt">.</span>send_rtcp_src <span class="gtkdoc opt">!</span> udpsink host<span class="gtkdoc opt">=</span><span class="string">"127.0.0.1"</span> port<span class="gtkdoc opt">=</span><span class="number">5002</span> sync<span class="gtkdoc opt">=</span><span class="keyword">false</span> async<span class="gtkdoc opt">=</span><span class="keyword">false</span> \
rtpsession name<span class="gtkdoc opt">=</span>rtpsession1 \
audiotestsrc wave<span class="gtkdoc opt">=</span><span class="number">0</span> <span class="gtkdoc opt">!</span> speexenc <span class="gtkdoc opt">!</span> rtpspeexpay pt<span class="gtkdoc opt">=</span><span class="number">97</span> <span class="gtkdoc opt">!</span> rtprtxsend rtx<span class="gtkdoc opt">-</span>payload<span class="gtkdoc opt">-</span>type<span class="gtkdoc opt">=</span><span class="number">99</span> seqnum<span class="gtkdoc opt">-</span>offset<span class="gtkdoc opt">=</span><span class="number">10</span> <span class="gtkdoc opt">!</span> \
identity drop<span class="gtkdoc opt">-</span>probability<span class="gtkdoc opt">=</span><span class="number">0.1</span> <span class="gtkdoc opt">!</span> rtpsession1<span class="gtkdoc opt">.</span>send_rtp_sink \
rtpsession1<span class="gtkdoc opt">.</span>send_rtp_src <span class="gtkdoc opt">!</span> udpsink host<span class="gtkdoc opt">=</span><span class="string">"127.0.0.1"</span> port<span class="gtkdoc opt">=</span><span class="number">5000</span> \
udpsrc port<span class="gtkdoc opt">=</span><span class="number">5004</span> <span class="gtkdoc opt">!</span> rtpsession1<span class="gtkdoc opt">.</span>recv_rtcp_sink \
rtpsession1<span class="gtkdoc opt">.</span>send_rtcp_src <span class="gtkdoc opt">!</span> udpsink host<span class="gtkdoc opt">=</span><span class="string">"127.0.0.1"</span> port<span class="gtkdoc opt">=</span><span class="number">5002</span> sync<span class="gtkdoc opt">=</span><span class="keyword">false</span> async<span class="gtkdoc opt">=</span><span class="keyword">false</span></pre></td>
</tr>
</tbody>
</table>
</div>
Send two audio streams to port 5000.
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8</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> rtpsession name<span class="gtkdoc opt">=</span>rtpsession
udpsrc port<span class="gtkdoc opt">=</span><span class="number">5000</span> caps<span class="gtkdoc opt">=</span><span class="string">"application/x-rtp,media=(string)audio,clock-rate=(int)44100,encoding-name=(string)SPEEX,encoding-params=(string)1,octet-align=(string)1"</span> <span class="gtkdoc opt">!</span> \
rtpsession<span class="gtkdoc opt">.</span>recv_rtp_sink \
rtpsession<span class="gtkdoc opt">.</span>recv_rtp_src <span class="gtkdoc opt">!</span> rtprtxreceive rtx<span class="gtkdoc opt">-</span>payload<span class="gtkdoc opt">-</span>types<span class="gtkdoc opt">=</span><span class="string">"99"</span> <span class="gtkdoc opt">!</span> rtpssrcdemux name<span class="gtkdoc opt">=</span>demux \
demux<span class="gtkdoc opt">. !</span> queue <span class="gtkdoc opt">!</span> rtpjitterbuffer <span class="keyword">do</span><span class="gtkdoc opt">-</span>retransmission<span class="gtkdoc opt">=</span><span class="keyword">true</span> <span class="gtkdoc opt">!</span> rtpspeexdepay <span class="gtkdoc opt">!</span> speexdec <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> autoaudiosink \
demux<span class="gtkdoc opt">. !</span> queue <span class="gtkdoc opt">!</span> rtpjitterbuffer <span class="keyword">do</span><span class="gtkdoc opt">-</span>retransmission<span class="gtkdoc opt">=</span><span class="keyword">true</span> <span class="gtkdoc opt">!</span> rtpspeexdepay <span class="gtkdoc opt">!</span> speexdec <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> autoaudiosink \
rtpsession<span class="gtkdoc opt">.</span>send_rtcp_src <span class="gtkdoc opt">! !</span> tee name<span class="gtkdoc opt">=</span>t <span class="gtkdoc opt">!</span> queue <span class="gtkdoc opt">!</span> udpsink host<span class="gtkdoc opt">=</span><span class="string">"127.0.0.1"</span> port<span class="gtkdoc opt">=</span><span class="number">5001</span> t<span class="gtkdoc opt">. !</span> queue <span class="gtkdoc opt">!</span> udpsink host<span class="gtkdoc opt">=</span><span class="string">"127.0.0.1"</span> port<span class="gtkdoc opt">=</span><span class="number">5004</span> \
udpsrc port<span class="gtkdoc opt">=</span><span class="number">5002</span> <span class="gtkdoc opt">!</span> rtpsession<span class="gtkdoc opt">.</span>recv_rtcp_sink sync<span class="gtkdoc opt">=</span>fakse async<span class="gtkdoc opt">=</span><span class="keyword">false</span></pre></td>
</tr>
</tbody>
</table>
</div>
Receive audio stream from port 5000.
On sender side the two streams have the same payload type for master streams, Same about retransmission streams.
The streams are sent to the network through two distincts sessions.
But we need to set a different seqnum-offset to make sure their seqnum navigate at a different rate like in concrete cases.
We could also choose the same seqnum offset but we would require to set a different initial seqnum value.
This is also why the rtprtxreceive can succeed to do the association between master and retransmission stream.
On receiver side the same session is used to receive the two streams. So the rtpssrcdemux is here to demultiplex
those two streams. The rtprtxreceive is responsible for reconstructing the original packets from the two retransmission streams.
You can play with the drop-probability value for one or both streams.
You should hear a clear sound. (after a few seconds the two streams wave feel synchronized)
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.201.7.4.1"></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>Julien Isorce <julien.isorce@collabora.co.uk></td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Codec</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.201.7.4.2"></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>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-rtprtxreceive.functions_details"></a><h2>Functions</h2>
<p></p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxreceive.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstRtpRtxReceive-struct"></a><h3>struct GstRtpRtxReceive</h3>
<pre class="programlisting">struct GstRtpRtxReceive;</pre>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxreceive.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstRtpRtxReceive--num-rtx-requests"></a><h3>The <code class="literal">“num-rtx-requests”</code> property</h3>
<pre class="programlisting"> “num-rtx-requests” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Number of retransmission events received.</p>
<p>Flags: Read</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpRtxReceive--num-rtx-packets"></a><h3>The <code class="literal">“num-rtx-packets”</code> property</h3>
<pre class="programlisting"> “num-rtx-packets” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p> Number of retransmission packets received.</p>
<p>Flags: Read</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpRtxReceive--num-rtx-assoc-packets"></a><h3>The <code class="literal">“num-rtx-assoc-packets”</code> property</h3>
<pre class="programlisting"> “num-rtx-assoc-packets” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Number of retransmission packets correctly associated with retransmission requests.</p>
<p>Flags: Read</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRtpRtxReceive--payload-type-map"></a><h3>The <code class="literal">“payload-type-map”</code> property</h3>
<pre class="programlisting"> “payload-type-map” <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstStructure.html#GstStructure-struct"><span class="type">GstStructure</span></a> *</pre>
<p>Map of original payload types to their retransmission payload types.</p>
<p>Flags: Read / Write</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxreceive.see-also"></a><h2>See Also</h2>
<p>rtprtxsend, rtpsession, rtpjitterbuffer</p>
</div>
</div>
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