For regression test, add srs-bench to 3rdparty

trunk/3rdparty/srs-bench/vendor/github.com/pion/rtcp/doc.go

@@ -0,0 +1,39 @@
+/*
+Package rtcp implements encoding and decoding of RTCP packets according to RFCs 3550 and 5506.
+
+RTCP is a sister protocol of the Real-time Transport Protocol (RTP). Its basic functionality
+and packet structure is defined in RFC 3550. RTCP provides out-of-band statistics and control
+information for an RTP session. It partners with RTP in the delivery and packaging of multimedia data,
+but does not transport any media data itself.
+
+The primary function of RTCP is to provide feedback on the quality of service (QoS)
+in media distribution by periodically sending statistics information such as transmitted octet
+and packet counts, packet loss, packet delay variation, and round-trip delay time to participants
+in a streaming multimedia session. An application may use this information to control quality of
+service parameters, perhaps by limiting flow, or using a different codec.
+
+Decoding RTCP packets:
+
+	pkt, err := rtcp.Unmarshal(rtcpData)
+	// ...
+
+	switch p := pkt.(type) {
+	case *rtcp.CompoundPacket:
+		...
+	case *rtcp.PictureLossIndication:
+		...
+	default:
+		...
+	}
+
+Encoding RTCP packets:
+
+	pkt := &rtcp.PictureLossIndication{
+		SenderSSRC: senderSSRC,
+		MediaSSRC: mediaSSRC
+	}
+	pliData, err := pkt.Marshal()
+	// ...
+
+*/
+package rtcp