Process RTCP Packets in OnTrack examples

TWCC and Receiver Reports are needed for a good default experience

examples/broadcast/main.go

@@ -64,6 +64,18 @@ func main() { // nolint:gocognit
 			}
 		}()
 
+		// Read incoming RTCP packets
+		// Before these packets are returned they are processed by interceptors. For things
+		// like TWCC and RTCP Reports this needs to be called.
+		go func() {
+			rtcpBuf := make([]byte, 1500)
+			for {
+				if _, _, rtcpErr := receiver.Read(rtcpBuf); rtcpErr != nil {
+					return
+				}
+			}
+		}()
+
 		// Create a local track, all our SFU clients will be fed via this track
 		localTrack, newTrackErr := webrtc.NewTrackLocalStaticRTP(remoteTrack.Codec().RTPCodecCapability, "video", "pion")
 		if newTrackErr != nil {

examples/reflect/main.go

@@ -110,6 +110,18 @@ func main() {
 			}
 		}()
 
+		// Read incoming RTCP packets
+		// Before these packets are returned they are processed by interceptors. For things
+		// like TWCC and RTCP Reports this needs to be called.
+		go func() {
+			rtcpBuf := make([]byte, 1500)
+			for {
+				if _, _, rtcpErr := receiver.Read(rtcpBuf); rtcpErr != nil {
+					return
+				}
+			}
+		}()
+
 		fmt.Printf("Track has started, of type %d: %s \n", track.PayloadType(), track.Codec().MimeType)
 		for {
 			// Read RTP packets being sent to Pion

examples/rtp-forwarder/main.go

@@ -132,6 +132,18 @@ func main() {
 			}
 		}()
 
+		// Read incoming RTCP packets
+		// Before these packets are returned they are processed by interceptors. For things
+		// like TWCC and RTCP Reports this needs to be called.
+		go func() {
+			rtcpBuf := make([]byte, 1500)
+			for {
+				if _, _, rtcpErr := receiver.Read(rtcpBuf); rtcpErr != nil {
+					return
+				}
+			}
+		}()
+
 		b := make([]byte, 1500)
 		rtpPacket := &rtp.Packet{}
 		for {

examples/save-to-disk/main.go

@@ -116,6 +116,18 @@ func main() {
 			}
 		}()
 
+		// Read incoming RTCP packets
+		// Before these packets are returned they are processed by interceptors. For things
+		// like TWCC and RTCP Reports this needs to be called.
+		go func() {
+			rtcpBuf := make([]byte, 1500)
+			for {
+				if _, _, rtcpErr := receiver.Read(rtcpBuf); rtcpErr != nil {
+					return
+				}
+			}
+		}()
+
 		codec := track.Codec()
 		if strings.EqualFold(codec.MimeType, webrtc.MimeTypeOpus) {
 			fmt.Println("Got Opus track, saving to disk as output.opus (48 kHz, 2 channels)")

examples/simulcast/main.go

@@ -123,8 +123,6 @@ func main() {
 	peerConnection.OnTrack(func(track *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) {
 		fmt.Println("Track has started")
 
-		// Start reading from all the streams and sending them to the related output track
-		rid := track.RID()
 		go func() {
 			ticker := time.NewTicker(3 * time.Second)
 			for range ticker.C {
@@ -134,6 +132,21 @@ func main() {
 				}
 			}
 		}()
+
+		// Read incoming RTCP packets
+		// Before these packets are returned they are processed by interceptors. For things
+		// like TWCC and RTCP Reports this needs to be called.
+		go func() {
+			rtcpBuf := make([]byte, 1500)
+			for {
+				if _, _, rtcpErr := receiver.Read(rtcpBuf); rtcpErr != nil {
+					return
+				}
+			}
+		}()
+
+		// Start reading from all the streams and sending them to the related output track
+		rid := track.RID()
 		for {
 			// Read RTP packets being sent to Pion
 			packet, _, readErr := track.ReadRTP()

examples/swap-tracks/main.go

@@ -80,6 +80,18 @@ func main() { // nolint:gocognit
 
 	// Set a handler for when a new remote track starts
 	peerConnection.OnTrack(func(track *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) {
+		// Read incoming RTCP packets
+		// Before these packets are returned they are processed by interceptors. For things
+		// like TWCC and RTCP Reports this needs to be called.
+		go func() {
+			rtcpBuf := make([]byte, 1500)
+			for {
+				if _, _, rtcpErr := receiver.Read(rtcpBuf); rtcpErr != nil {
+					return
+				}
+			}
+		}()
+
 		fmt.Printf("Track has started, of type %d: %s \n", track.PayloadType(), track.Codec().MimeType)
 		trackNum := trackCount
 		trackCount++