Need Help Regarding SRTPDEC request_key_callback

[sameer]

Hello All,

I am trying to record audio received in form srtp in a custom 
application. For this I set up following pipeline programatically:

udpsrc port=5906 
caps="application/x-srtp,channels=(int)1,media=(string)audio,payload=(int)0,clock-rate=(int)8000,encoding-name=(string)PCMU,ssrc=(uint)0,srtp-key=(buffer)344d2b7943556a5679644c53724d7232314478784a766e7075674446717172414639736c52717467,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" 
! srtpdec ! rtppcmudepay ! filesink location=/home/audio.pcmu

The ssrc is not received in sdp. I have implemented the callback 
function to return capstring as mentioned in the documentation 
<https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad/html/gst-plugins-bad-plugins-srtpdec.html> 
:

*static GstCaps request_key_callback (GstElement  gstsrtpdec, guint  
ssrc, gpointer  udata) *

The capstring returned is like:

*" 
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 
"**
*

But after the callback invokes I am receiving following error:

*(recorder:32537): GLib-GObject-CRITICAL **: 14:18:06.064: 
g_object_unref: assertion 'G_IS_OBJECT (object)' failed**
**
**** (recorder:32537): CRITICAL **: 14:18:06.064: 
update_session_stream_from_caps: assertion 'GST_IS_SRTP_DEC (filter)' 
failed**
*

and the app crashes.

Can anyone tell me what mistake I am making. I am not able to find much 
in the documentation or any examples.

Thanks & Regards.

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