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<div class="refentry">
<a name="gst-plugins-bad-plugins-srtpenc"></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-srtpenc.top_of_page"></a>srtpenc</span></h2>
<p>srtpenc</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-srtpenc.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="../gstreamer-1.0/GstBuffer.html#GstBuffer-struct"><span class="type">GstBuffer</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc--key" title="The “key” property">key</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc--random-key" title="The “random-key” property">random-key</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">GstSrtpAuthType</span></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc--rtcp-auth" title="The “rtcp-auth” property">rtcp-auth</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">GstSrtpCipherType</span></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc--rtcp-cipher" title="The “rtcp-cipher” property">rtcp-cipher</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">GstSrtpAuthType</span></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc--rtp-auth" title="The “rtp-auth” property">rtp-auth</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">GstSrtpCipherType</span></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc--rtp-cipher" title="The “rtp-cipher” property">rtp-cipher</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="../glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc--replay-window-size" title="The “replay-window-size” property">replay-window-size</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc--allow-repeat-tx" title="The “allow-repeat-tx” property">allow-repeat-tx</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<a href="../gstreamer-1.0/GstStructure.html#GstStructure-struct"><span class="type">GstStructure</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc--stats" title="The “stats” property">stats</a></td>
<td class="property_flags">Read</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-srtpenc.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-bad-plugins-srtpenc.html#GstSrtpEnc-soft-limit" title="The “soft-limit” signal">soft-limit</a></td>
<td class="signal_flags"><a href="../gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
<tr>
<td class="signal_type"><a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a></td>
<td class="signal_name"><a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc-get-rollover-counter" title="The “get-rollover-counter” signal">get-rollover-counter</a></td>
<td class="signal_flags"><a href="../gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstSrtpEnc"></a><div class="refsect1">
<a name="gst-plugins-bad-plugins-srtpenc.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-srtpenc.html#GstSrtpEnc-struct" title="struct GstSrtpEnc">GstSrtpEnc</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-srtpenc.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="../gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
<span class="lineart">╰──</span> <a href="../gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
<span class="lineart">╰──</span> <a href="../gstreamer-1.0/GstObject.html#GstObject-struct">GstObject</a>
<span class="lineart">╰──</span> <a href="../gstreamer-1.0/GstElement.html#GstElement-struct">GstElement</a>
<span class="lineart">╰──</span> GstSrtpEnc
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-srtpenc.description"></a><h2>Description</h2>
<p>gstrtpenc acts as an encoder that adds security to RTP and RTCP
packets in the form of encryption and authentication. It outs SRTP
and SRTCP.</p>
<p>An application can request multiple RTP and RTCP pads to protect,
but every sink pad requested must receive packets from the same
source (identical SSRC). If a packet received contains a different
SSRC, a warning is emited and the valid SSRC is forced on the packet.</p>
<p>This element uses libsrtp library. When receiving the first packet,
the library is initialized with a new stream (based on the SSRC). It
uses the default RTP and RTCP encryption and authentication mechanisms,
unless the user has set the relevant properties first. It also uses
a master key that MUST be set by property (key) at the beginning. The
master key must be of a maximum length of 46 characters (14 characters
for the salt plus the key). The encryption and authentication mecanisms
available are :</p>
<p>Encryption (properties rtp-cipher and rtcp-cipher)</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>AES_ICM 256 bits (maximum security)</p></li>
<li class="listitem"><p>AES_ICM 128 bits (default)</p></li>
<li class="listitem"><p>NULL</p></li>
</ul></div>
<p>Authentication (properties rtp-auth and rtcp-auth)</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>HMAC_SHA1 80 bits (default, maximum protection)</p></li>
<li class="listitem"><p>HMAC_SHA1 32 bits</p></li>
<li class="listitem"><p>NULL</p></li>
</ul></div>
<p>Note that for SRTP protection, authentication is mandatory (non-null)
if encryption is used (non-null).</p>
<p>When requested to create a sink pad, a linked source pad is created.
Each packet received is first analysed (checked for valid SSRC) then
its buffer is protected with libsrtp, then pushed on the source pad.
If protection failed or the stream could not be created, the buffer
is dropped and a warning is emitted. The packets pushed on the source
pad are of type 'application/x-srtp' or 'application/x-srtcp'.</p>
<p>When the maximum usage of the master key is reached, a soft-limit
signal is sent to the user. The user must then set a new master key
by property. If the hard limit is reached, a flag is set and every
subsequent packet is dropped, until a new key is set and the stream
has been updated.</p>
<p>If a stream is to be shared between multiple clients it is also
possible to request the internal SRTP rollover counter for a given
SSRC. The rollover counter should be then transmitted and used by the
clients to authenticate and decrypt the packets. Failing to do that
the clients will start with a rollover counter of 0 which will
probably be incorrect if the stream has been transmitted for a
while to other clients.</p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.219.8.13.1"></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-srtp.html#plugin-srtp">srtp</a>
</td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Gabriel Millaire <millaire.gabriel@collabora.com></td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Filter/Network/SRTP</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.219.8.13.2"></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>rtcp_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>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>rtp_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>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>rtcp_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>application/x-srtcp</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>rtp_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>application/x-srtp</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-srtpenc.functions_details"></a><h2>Functions</h2>
<p></p>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-srtpenc.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstSrtpEnc-struct"></a><h3>struct GstSrtpEnc</h3>
<pre class="programlisting">struct GstSrtpEnc;</pre>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-srtpenc.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstSrtpEnc--key"></a><h3>The <code class="literal">“key”</code> property</h3>
<pre class="programlisting"> “key” <a href="../gstreamer-1.0/GstBuffer.html#GstBuffer-struct"><span class="type">GstBuffer</span></a> *</pre>
<p>Master key (minimum of 30 and maximum of 46 bytes).</p>
<p>Flags: Read / Write</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSrtpEnc--random-key"></a><h3>The <code class="literal">“random-key”</code> property</h3>
<pre class="programlisting"> “random-key” <a href="../glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Generate a random key if TRUE.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSrtpEnc--rtcp-auth"></a><h3>The <code class="literal">“rtcp-auth”</code> property</h3>
<pre class="programlisting"> “rtcp-auth” <span class="type">GstSrtpAuthType</span></pre>
<p>RTCP Authentication.</p>
<p>Flags: Read / Write</p>
<p>Default value: GST_SRTP_AUTH_HMAC_SHA1_80</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSrtpEnc--rtcp-cipher"></a><h3>The <code class="literal">“rtcp-cipher”</code> property</h3>
<pre class="programlisting"> “rtcp-cipher” <span class="type">GstSrtpCipherType</span></pre>
<p>RTCP Cipher.</p>
<p>Flags: Read / Write</p>
<p>Default value: GST_SRTP_CIPHER_AES_128_ICM</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSrtpEnc--rtp-auth"></a><h3>The <code class="literal">“rtp-auth”</code> property</h3>
<pre class="programlisting"> “rtp-auth” <span class="type">GstSrtpAuthType</span></pre>
<p>RTP Authentication.</p>
<p>Flags: Read / Write</p>
<p>Default value: GST_SRTP_AUTH_HMAC_SHA1_80</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSrtpEnc--rtp-cipher"></a><h3>The <code class="literal">“rtp-cipher”</code> property</h3>
<pre class="programlisting"> “rtp-cipher” <span class="type">GstSrtpCipherType</span></pre>
<p>RTP Cipher.</p>
<p>Flags: Read / Write</p>
<p>Default value: GST_SRTP_CIPHER_AES_128_ICM</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSrtpEnc--replay-window-size"></a><h3>The <code class="literal">“replay-window-size”</code> property</h3>
<pre class="programlisting"> “replay-window-size” <a href="../glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Size of the replay protection window.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [64,32768]</p>
<p>Default value: 128</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSrtpEnc--allow-repeat-tx"></a><h3>The <code class="literal">“allow-repeat-tx”</code> property</h3>
<pre class="programlisting"> “allow-repeat-tx” <a href="../glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Whether retransmissions of packets with the same sequence number are allowed(Note that such repeated transmissions must have the same RTP payload, or a severe security weakness is introduced!).</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSrtpEnc--stats"></a><h3>The <code class="literal">“stats”</code> property</h3>
<pre class="programlisting"> “stats” <a href="../gstreamer-1.0/GstStructure.html#GstStructure-struct"><span class="type">GstStructure</span></a> *</pre>
<p>Various statistics.</p>
<p>Flags: Read</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-srtpenc.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GstSrtpEnc-soft-limit"></a><h3>The <code class="literal">“soft-limit”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc"><span class="type">GstSrtpEnc</span></a> *gstsrtpenc,
<a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data)</pre>
<p>Signal emited when the stream with <em class="parameter"><code>ssrc</code></em>
has reached the soft
limit of utilisation of it's master encryption key. User should
provide a new key by setting the <a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc--key" title="The “key” property"><span class="type">“key”</span></a> property.</p>
<div class="refsect3">
<a name="GstSrtpEnc-soft-limit.parameters"></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>gstsrtpenc</p></td>
<td class="parameter_description"><p>the element on which the signal is emitted</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="../gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstSrtpEnc-get-rollover-counter"></a><h3>The <code class="literal">“get-rollover-counter”</code> signal</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
user_function (<a class="link" href="gst-plugins-bad-plugins-srtpenc.html#GstSrtpEnc"><span class="type">GstSrtpEnc</span></a> *gstsrtpenc,
<a href="../glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> arg1,
<a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data)</pre>
<p>Flags: <a href="../gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-srtpenc.see-also"></a><h2>See Also</h2>
<p>srtpdec</p>
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