Make sfu-to-sfu talk MSC3401 and add new features

src/call.go

@@ -235,6 +235,15 @@ func (c *Call) iceCandidateHandler(candidate *webrtc.ICECandidate) {
 
 	jsonCandidate := candidate.ToJSON()
 
+	callCandidate := event.CallCandidate{
+		Candidate:     jsonCandidate.Candidate,
+		SDPMLineIndex: int(*jsonCandidate.SDPMLineIndex),
+		SDPMID:        *jsonCandidate.SDPMid,
+	}
+	if jsonCandidate.UsernameFragment != nil {
+		callCandidate.UsernameFragment = *jsonCandidate.UsernameFragment
+	}
+
 	candidateEvtContent := &event.Content{
 		Parsed: event.CallCandidatesEventContent{
 			BaseCallEventContent: event.BaseCallEventContent{
@@ -246,14 +255,7 @@ func (c *Call) iceCandidateHandler(candidate *webrtc.ICECandidate) {
 				PartyID:         string(c.Client.DeviceID),
 				Version:         event.CallVersion("1"),
 			},
-			Candidates: []event.CallCandidate{
-				{
-					Candidate:     jsonCandidate.Candidate,
-					SDPMLineIndex: int(*jsonCandidate.SDPMLineIndex),
-					SDPMID:        *jsonCandidate.SDPMid,
-					// XXX: what about ice.UsernameFragment?
-				},
-			},
+			Candidates: []event.CallCandidate{callCandidate},
 		},
 	}
 	c.sendToDevice(event.CallCandidates, candidateEvtContent)