[Bug 795044] webrtcbin: implement support for FEC and RTX

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795044

Andreas Frisch <gnome-bugzilla at dreambox.guru> changed:

           What    |Removed                     |Added
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                 CC|                            |gnome-bugzilla at dreambox.gur
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--- Comment #12 from Andreas Frisch <gnome-bugzilla at dreambox.guru> ---
* i've applied https://bugzilla.gnome.org/attachment.cgi?id=371671
* i'm listening to object-signal::on-new-transceiver and there set the
fec-type, GST_WEBRTC_FEC_TYPE_ULP_RED. 
* in object-signal::on-negotiation-needed i set
fec-type=GST_WEBRTC_FEC_TYPE_ULP_RED and fec-percentage=100 for the 0st
transceiver.

this results in an SDP containing two extra streams
a=rtpmap:102 red/90000
a=rtpmap:104 ulpfec/90000

however, this triggers object-signal::pad-added on the two extra rtp streams
for red und ulpfec and i'm not sure how to handle them application-wise.

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