For regression test, add srs-bench to 3rdparty

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

@@ -0,0 +1,115 @@
+package rtcp
+
+// Packet represents an RTCP packet, a protocol used for out-of-band statistics and control information for an RTP session
+type Packet interface {
+	// DestinationSSRC returns an array of SSRC values that this packet refers to.
+	DestinationSSRC() []uint32
+
+	Marshal() ([]byte, error)
+	Unmarshal(rawPacket []byte) error
+}
+
+// Unmarshal takes an entire udp datagram (which may consist of multiple RTCP packets) and
+// returns the unmarshaled packets it contains.
+//
+// If this is a reduced-size RTCP packet a feedback packet (Goodbye, SliceLossIndication, etc)
+// will be returned. Otherwise, the underlying type of the returned packet will be
+// CompoundPacket.
+func Unmarshal(rawData []byte) ([]Packet, error) {
+	var packets []Packet
+	for len(rawData) != 0 {
+		p, processed, err := unmarshal(rawData)
+		if err != nil {
+			return nil, err
+		}
+
+		packets = append(packets, p)
+		rawData = rawData[processed:]
+	}
+
+	switch len(packets) {
+	// Empty packet
+	case 0:
+		return nil, errInvalidHeader
+	// Multiple Packets
+	default:
+		return packets, nil
+	}
+}
+
+// Marshal takes an array of Packets and serializes them to a single buffer
+func Marshal(packets []Packet) ([]byte, error) {
+	out := make([]byte, 0)
+	for _, p := range packets {
+		data, err := p.Marshal()
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, data...)
+	}
+	return out, nil
+}
+
+// unmarshal is a factory which pulls the first RTCP packet from a bytestream,
+// and returns it's parsed representation, and the amount of data that was processed.
+func unmarshal(rawData []byte) (packet Packet, bytesprocessed int, err error) {
+	var h Header
+
+	err = h.Unmarshal(rawData)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	bytesprocessed = int(h.Length+1) * 4
+	if bytesprocessed > len(rawData) {
+		return nil, 0, errPacketTooShort
+	}
+	inPacket := rawData[:bytesprocessed]
+
+	switch h.Type {
+	case TypeSenderReport:
+		packet = new(SenderReport)
+
+	case TypeReceiverReport:
+		packet = new(ReceiverReport)
+
+	case TypeSourceDescription:
+		packet = new(SourceDescription)
+
+	case TypeGoodbye:
+		packet = new(Goodbye)
+
+	case TypeTransportSpecificFeedback:
+		switch h.Count {
+		case FormatTLN:
+			packet = new(TransportLayerNack)
+		case FormatRRR:
+			packet = new(RapidResynchronizationRequest)
+		case FormatTCC:
+			packet = new(TransportLayerCC)
+		default:
+			packet = new(RawPacket)
+		}
+
+	case TypePayloadSpecificFeedback:
+		switch h.Count {
+		case FormatPLI:
+			packet = new(PictureLossIndication)
+		case FormatSLI:
+			packet = new(SliceLossIndication)
+		case FormatREMB:
+			packet = new(ReceiverEstimatedMaximumBitrate)
+		case FormatFIR:
+			packet = new(FullIntraRequest)
+		default:
+			packet = new(RawPacket)
+		}
+
+	default:
+		packet = new(RawPacket)
+	}
+
+	err = packet.Unmarshal(inPacket)
+
+	return packet, bytesprocessed, err
+}