Log large packets receive/send. (#4521)

* Log large packets receive/send.

Seeing cases of servers reporting need for segmentation/re-assembly of
packets. So, logging packet receive/send for RTP/RTCP to check if
anything is seeing more than 1400 byte packets.

* log downtrack RTCP too

pkg/sfu/buffer/buffer.go

@@ -138,9 +138,11 @@ func (b *Buffer) Bind(params webrtc.RTPParameters, codec webrtc.RTPCodecCapabili
 }
 
 // Write adds an RTP Packet, ordering is not guaranteed, newer packets may arrive later
-//
-//go:noinline
 func (b *Buffer) Write(pkt []byte) (n int, err error) {
+	if len(pkt) > 1400 {
+		b.logger.Infow("large RTP packet received", "size", len(pkt))
+	}
+
 	var rtpPacket rtp.Packet
 	err = rtpPacket.Unmarshal(pkt)
 	if err != nil {