Fix down stream packet loss reporting. (#3092)

* Fix down stream packet loss reporting.

* format

pkg/sfu/connectionquality/connectionstats.go

@@ -261,13 +261,13 @@ func (cs *ConnectionStats) updateScoreFromReceiverReport(at time.Time) (float32,
 
 	// delta stat duration could be large due to not receiving receiver report for a long time (for example, due to mute),
 	// adjust to streaming start if necessary
-	agg := toAggregateDeltaInfo(streams)
 	if streamingStartedAt.After(cs.params.SenderProvider.GetLastReceiverReportTime()) {
 		// last receiver report was before streaming started, wait for next one
 		mos, _ := cs.scorer.GetMOSAndQuality()
 		return mos, streams
 	}
 
+	agg := toAggregateDeltaInfo(streams)
 	if streamingStartedAt.After(agg.StartTime) {
 		agg.StartTime = streamingStartedAt
 	}

pkg/sfu/downtrack.go

@@ -1769,10 +1769,11 @@ func (d *DownTrack) handleRTCP(bytes []byte) {
 			}
 			if len(rr.Reports) > 0 {
 				d.listenerLock.RLock()
-				for _, l := range d.receiverReportListeners {
+				rrListeners := d.receiverReportListeners
+				d.listenerLock.RUnlock()
+				for _, l := range rrListeners {
 					l(d, rr)
 				}
-				d.listenerLock.RUnlock()
 			}
 
 		case *rtcp.TransportLayerNack:

pkg/sfu/rtpstats/rtpstats_sender.go

@@ -881,8 +881,9 @@ func (r *RTPStatsSender) getSenderSnapshot(startTime time.Time, s *senderSnapsho
 		packetsDuplicate:     r.packetsDuplicate,
 		bytesDuplicate:       r.bytesDuplicate,
 		headerBytesDuplicate: r.headerBytesDuplicate,
-		packetsLostFeed:      r.packetsLost,
 		packetsOutOfOrder:    s.packetsOutOfOrder + s.intervalStats.packetsOutOfOrder,
+		packetsLostFeed:      r.packetsLost,
+		packetsLost:          r.packetsLostFromRR,
 		frames:               s.frames + s.intervalStats.frames,
 		nacks:                r.nacks,
 		plis:                 r.plis,