RTP & RTCP restream using rtpbin.

[stproj]

Sebastian Dröge-3 wrote
> On Wed, 2016-10-19 at 05:15 -0700, stproj wrote:
>> Greetings,
>> 
>> I'm trying to built a streaming application that involves streaming and
>> restreaming to different machines the same source and daisy chain them.
>> 
>> What i want to do for starters, is to make rtpbin both a receiver and a
>> transmitter of an rtp stream, and its respective rtcp streams. Below, im
>> providing the part where I'm trying to link rtpsrc to rtpbin and rtpbin
>> to
>> rtpsink, but it doesn't work (can't link rtpbin to rtpsink). If u have
>> any
>> suggestion on how should i move pls share the knowledge!! 
>> 
>> Thank you in advance,
>> S.
>> 
>> 
>> 
>>   /* the rtpbin element */
>>   rtpbin = gst_element_factory_make ("rtpbin", "rtpbin");
>>   g_assert (rtpbin);
>>   
>>   gst_bin_add (GST_BIN (pipeline), rtpbin);
>>   
>>   /* now link all to the rtpbin, start by getting an RTP sinkpad for
>> session
>> 0 */
>>   srcpad = gst_element_get_static_pad (rtpsrc, "src");
>>   sinkpad = gst_element_get_request_pad (rtpbin, "recv_rtp_sink_0");
>>   lres = gst_pad_link (srcpad, sinkpad);
>>   g_assert (lres == GST_PAD_LINK_OK);
>>   gst_object_unref (srcpad);
>> 
>>   /* get the RTP srcpad that was created when we requested the sinkpad
>> above
>> and
>>    * link it to the rtpsink sinkpad*/
>>   srcpad = gst_element_get_request_pad (rtpbin, "send_rtp_src_0");
>>   sinkpad = gst_element_get_static_pad (rtpsink, "sink");
>>   if (gst_pad_link (srcpad,sinkpad) != GST_PAD_LINK_OK)
>>     g_error ("Failed to link rtpbin to rtpsink");
> 
> "send_rtp_src_%u" is a sometimes pad on rtpbin, not a request pad. It
> will appear (check the pad-added signal) at some point and then you can
> link it.
> 
> You probably also want "recv_rtp_src_%u_%u_%u", which is the pad that
> is created (also later, see pad-added) from "recv_rtp_sink_%u".
> 
> -- 
> Sebastian Dröge, Centricular Ltd · http://www.centricular.com
> _______________________________________________
> gstreamer-devel mailing list

> gstreamer-devel at .freedesktop

> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> 
> 
> signature.asc (949 bytes)
> <http://gstreamer-devel.966125.n4.nabble.com/attachment/4680135/0/signature.asc>

Hello Sebastian,

 Thank you for your reply. You are right, with on_pad_added_cb i can link
rtpbin to rtpsink and relay the rtpstream. 

 I now have the same problem with building the rtcp src/sink for this
particular session. Do you think that i can rename the new_pad  or should i
extract the %u_%u_%u  part from the string in order to make it the same for
the rtcpsrcpad & rtcpsinkpads. 

Im providing the on_pad_added_cb.

static void
pad_added_cb (GstElement * rtpbin, GstPad * new_pad, GstElement * sink)
{
  GstPad *sinkpad, *srcpad;
  GstPadLinkReturn lres;

  g_print ("new payload on pad: %s\n", GST_PAD_NAME (new_pad));
  
  sinkpad = gst_element_get_static_pad (sink, "sink");
  g_assert (sinkpad);

  lres = gst_pad_link (new_pad, sinkpad);
  g_assert (lres == GST_PAD_LINK_OK);
  gst_object_unref (sinkpad);

}



 





--
View this message in context: http://gstreamer-devel.966125.n4.nabble.com/RTP-RTCP-restream-using-rtpbin-tp4680123p4680143.html
Sent from the GStreamer-devel mailing list archive at Nabble.com.