RTP & RTCP restream using rtpbin.

[Sebastian Dröge]

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
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