title: Get info about whether gstreamer is recieving any packet
body: <p>My application was to have a audio streaming application in a multicast group. Its like a push to talk radio. When someone push the button audio gets transmitted. I am using gstreamer for streaming audio. Is there any way that i can know whether someone is talking at present or not.</p>
  
  <p>When someone presses the button to talk i need to inform him that already someone else is talking or not.</p>
  
  <p>Is there any gstreamer api to know that or is there any other way for knowing it.</p>
  
  <p>Edit:
  To understand my question well i will describe a use case.</p>
  
  <p>Consider 4 USERS are there in a multicast group.</p>
  
  <ul>
  <li>USER1 presses the PTT button and starts talking</li>
  <li>At this time if any one say USER2 presses PTT button i need to inform
  USER2 that USER1 is already
    talking (atleast that someone else is talking). </li>
  <li>Also I need to inform USER1 that USER2 has now pressed PTT button.</li>
  </ul>
  
  <p>Is there any api in gstreamer with which i can get these information</p>
  
  <p>1) Whether someone else is streaming or not in that multicast group?</p>
  
  <p>2) Retrieve info about the streaming user?</p>