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<p>Hello All,</p>
<p>It seems like callback for signal "request-key" is being invoked
on a different context and user_data is not accesible. App crashes
when I try to access user_data.</p>
<p> I have tried to use GMainContext from this <a
moz-do-not-send="true"
href="https://developer.gnome.org/programming-guidelines/stable/main-contexts.html.en">link</a>
to get signal callback in the same context but nothing helps.</p>
<p>Any help would be much appreciated.</p>
<p>Thanks<br>
</p>
<div class="moz-cite-prefix">On 09/04/20 7:44 pm, sameer wrote:<br>
</div>
<blockquote type="cite"
cite="mid:53c0740d-01ac-dd6d-f266-f16cd03bce67@evontech.com">
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<p>Any updates on this? We are stuck for some while in this issue
and it is crucial for us to get the srtp recording going.<br>
</p>
<div class="moz-cite-prefix">On 09/04/20 2:58 pm, sameer wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5ab454b3-9604-1da2-3e20-a3a10f475d90@evontech.com">
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<p>We are running pipeline in a different thread other than the
main thread of application. Can the unref issue be related to
different thread context?<br>
</p>
<div class="moz-cite-prefix">On 08/04/20 9:03 pm, sameer wrote:<br>
</div>
<blockquote type="cite"
cite="mid:dc306039-4873-1d99-4124-5eb51cf59366@evontech.com">
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<p>On returning caps instead of *caps the app is crashing
without showing any errorlogs.</p>
<p> Do I need to add the callback method in the class as a
member method?<br>
</p>
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cite="mid:VE1PR03MB5903CFAB9E4496174EF57373A3C00@VE1PR03MB5903.eurprd03.prod.outlook.com">
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span lang="EL">From:</span></b><span
lang="EL"> Olivier Crête <a
class="moz-txt-link-rfc2396E"
href="mailto:olivier.crete@collabora.com"
moz-do-not-send="true"><olivier.crete@collabora.com></a>
<br>
<b>Sent:</b> Wednesday, April 8, 2020 4:47 PM<br>
<b>To:</b> Discussion of the development of and
with GStreamer <a class="moz-txt-link-rfc2396E"
href="mailto:gstreamer-devel@lists.freedesktop.org"
moz-do-not-send="true"><gstreamer-devel@lists.freedesktop.org></a><br>
<b>Cc:</b> Lefteris Diakakis <a
class="moz-txt-link-rfc2396E"
href="mailto:ldiakakis@rtelworld.com"
moz-do-not-send="true"><ldiakakis@rtelworld.com></a><br>
<b>Subject:</b> Re: Need Help Regarding SRTPDEC
request_key_callback<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Hi,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">On Wed, 2020-04-08 at 18:52 +0530,
sameer wrote:<o:p></o:p></p>
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<p>Thank you for the quick reply!<o:p></o:p></p>
<p>We have not unref the srtpdec object anywhere. Even
made the srtpdec object global.<o:p></o:p></p>
<div>
<p>Following is our implementation of callback:<o:p></o:p></p>
<p>g_signal_connect(G_OBJECT(srtpdec), "request-key",
G_CALLBACK (request_key_callback), &masterKey);<o:p></o:p></p>
<p>// masterKey is string<o:p></o:p></p>
<p>// srtpdec is global GstElement<o:p></o:p></p>
<p>GstCaps request_key_callback (GstElement
gstsrtpdec, guint ssrc, gpointer udata) <o:p></o:p></p>
</div>
</blockquote>
<div>
<p class="MsoNormal">The return value should be a
"GstCaps *"<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<p>{ <br>
string *key = (string*)udata;<br>
GstCaps *caps = gst_caps_new_simple
("application/x-srtp",<br>
"payload", G_TYPE_INT, 0,<br>
"ssrc", G_TYPE_UINT, ssrc,<br>
"srtp-key", G_TYPE_STRING, key->c_str(),<br>
"srtp-auth", G_TYPE_STRING, "hmac-sha1-80",<br>
"srtp-cipher", G_TYPE_STRING, "aes-128-icm",<br>
"srtcp-auth", G_TYPE_STRING, "hmac-sha1-80",<br>
"srtcp-cipher", G_TYPE_STRING, "aes-128-icm",<br>
"roc", G_TYPE_UINT, 0,<br>
NULL);<br>
return *caps;<br>
}<o:p></o:p></p>
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</blockquote>
<div>
<p class="MsoNormal">And you should "return caps;"<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Olivier<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p>Is it the correct way?<o:p></o:p></p>
<p>Thanks<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EL">From:</span></b><span
lang="EL"> Olivier Crête <a
href="mailto:olivier.crete@collabora.com"
moz-do-not-send="true"><olivier.crete@collabora.com></a>
<br>
<b>Sent:</b> Wednesday, April 8, 2020 3:52 PM<br>
<b>To:</b> Discussion of the development of
and with GStreamer <a
href="mailto:gstreamer-devel@lists.freedesktop.org"
moz-do-not-send="true">
<gstreamer-devel@lists.freedesktop.org></a><br>
<b>Cc:</b> Lefteris Diakakis <a
href="mailto:ldiakakis@rtelworld.com"
moz-do-not-send="true"><ldiakakis@rtelworld.com></a><br>
<b>Subject:</b> Re: Need Help Regarding
SRTPDEC request_key_callback</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<div>
<p class="MsoNormal">Hi,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">On Wed, 2020-04-08 at 14:37
+0530, sameer wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid
#729FCF 1.5pt;padding:0cm 0cm 0cm
6.0pt;margin-left:4.8pt;margin-right:0cm">
<p>The ssrc is not received in sdp. I have
implemented the callback function to return
capstring as mentioned in the <a
href="https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad/html/gst-plugins-bad-plugins-srtpdec.html"
moz-do-not-send="true"> documentation</a> :<o:p></o:p></p>
<p><b>static GstCaps request_key_callback
(GstElement gstsrtpdec, guint ssrc, gpointer
udata) </b><o:p></o:p></p>
<p>The capstring returned is like:<o:p></o:p></p>
<p><b>"
application/x-srtp,channels=(int)1,media=(string)audio,payload=(int)0,clock-rate=(int)8000,encoding-name=(string)PCMU,ssrc=(uint)1932929554,srtp-key=(buffer)4d73554e564e334354466141365042324168614444436c4a456a754a497673747a354e5961694d5a,srtp-cipher=(string)aes-128-icm,srtp-auth=(string)hmac-sha1-32,srtcp-cipher=(string)aes-128-icm,srtcp-auth=(string)hmac-sha1-32,roc=(uint)0
"</b><o:p></o:p></p>
<p>But after the callback invokes I am receiving
following error:<o:p></o:p></p>
<p><b>(recorder:32537): GLib-GObject-CRITICAL **:
14:18:06.064: g_object_unref: assertion
'G_IS_OBJECT (object)' failed<br>
<br>
** (recorder:32537): CRITICAL **: 14:18:06.064:
update_session_stream_from_caps: assertion
'GST_IS_SRTP_DEC (filter)' failed</b><o:p></o:p></p>
<p>and the app crashes.<o:p></o:p></p>
<p>Can anyone tell me what mistake I am making. I am
not able to find much in the documentation or any
examples.<o:p></o:p></p>
</blockquote>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">You probably unref the srtpdec
object somewhere where you shouldn't.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<pre>-- <o:p></o:p></pre>
<pre>Olivier Crête<o:p></o:p></pre>
<p class="MsoNormal"><a
href="mailto:olivier.crete@collabora.com"
moz-do-not-send="true"><o:p></o:p></a></p>
<pre><u><span style="color:blue"><a href="mailto:olivier.crete@collabora.com" moz-do-not-send="true">olivier.crete@collabora.com<span style="color:windowtext;text-decoration:none"><o:p></o:p></span></a></span></u></pre>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</blockquote>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>gstreamer-devel mailing list<o:p></o:p></pre>
<p class="MsoNormal"><a
href="mailto:gstreamer-devel@lists.freedesktop.org"
moz-do-not-send="true"><o:p></o:p></a></p>
<pre><u><span style="color:blue"><a href="mailto:gstreamer-devel@lists.freedesktop.org" moz-do-not-send="true">gstreamer-devel@lists.freedesktop.org<span style="color:windowtext;text-decoration:none"><o:p></o:p></span></a></span></u></pre>
<p class="MsoNormal"><o:p> </o:p></p>
<pre><o:p> </o:p></pre>
<p class="MsoNormal"><a
href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel"
moz-do-not-send="true"><o:p></o:p></a></p>
<pre><u><span style="color:blue"><a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" moz-do-not-send="true">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel<span style="color:windowtext;text-decoration:none"><o:p></o:p></span></a></span></u></pre>
<p class="MsoNormal"><o:p> </o:p></p>
<pre><o:p> </o:p></pre>
</blockquote>
<div>
<pre>-- <o:p></o:p></pre>
<pre>Olivier Crête<o:p></o:p></pre>
<pre><a href="mailto:olivier.crete@collabora.com" moz-do-not-send="true">olivier.crete@collabora.com</a><o:p></o:p></pre>
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