Issue 163 - Unhandled vs Discarded event for RTCRtpListener

[BA]
The WebRTC 1.0 API now has a pull request relating to unhandled RTP media streams: 
w3c/webrtc-pc#29

This involves definition of an RTCMediaDiscardedEvent.


[RR]

In ORTC it’s called unhandled and I think that’s appropriate vs WebRTC 1.0.

I think the discarded event is because media cannot be routed to an m= line for decoding. In SDP world, there's no easy fix because you need to do an offer / answer exchange and by the time you complete O/A it's too late to fix so discarded is appropriate. But in ORTC we can fix this without any O/A so therefor it's unhandled since a new receiver object can quickly be setup.

-Robin