Add rtcp sr and rr packet types

Relates to #119

pkg/rtcp/packet.go

@@ -1,107 +0,0 @@
-package rtcp
-
-import (
-	"encoding/binary"
-
-	"github.com/pkg/errors"
-)
-
-// RTCP packet types registered with IANA. See: https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml#rtp-parameters-4
-const (
-	TypeSenderReport       = 200 // RFC 3550, 6.4.1
-	TypeReceiverReport     = 201 // RFC 3550, 6.4.2
-	TypeSourceDescription  = 202 // RFC 3550, 6.5
-	TypeGoodbye            = 203 // RFC 3550, 6.6
-	TypeApplicationDefined = 204 // RFC 3550, 6.7
-)
-
-// A Header is the common header shared by all RTCP packets
-type Header struct {
-	// Identifies the version of RTP, which is the same in RTCP packets
-	// as in RTP data packets.
-	Version uint8
-	// If the padding bit is set, this individual RTCP packet contains
-	// some additional padding octets at the end which are not part of
-	// the control information but are included in the length field.
-	Padding bool
-	// The number of reception report blocks contained in this packet.
-	ReportCount uint8
-	// The RTCP packet type for this packet
-	Type uint8
-	// The length of this RTCP packet in 32-bit words minus one,
-	// including the header and any padding.
-	Length uint16
-}
-
-const (
-	headerLength     = 4
-	versionShift     = 6
-	versionMask      = 0x3
-	paddingShift     = 5
-	paddingMask      = 0x1
-	reportCountShift = 0
-	reportCountMask  = 0x1f
-)
-
-var (
-	errInvalidVersion     = errors.New("invalid version")
-	errInvalidReportCount = errors.New("invalid report count")
-	errHeaderTooShort     = errors.New("rtcp header too short")
-)
-
-// Marshal encodes the Header in binary
-func (h Header) Marshal() ([]byte, error) {
-	/*
-	 *  0                   1                   2                   3
-	 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
-	 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-	 * |V=2|P|    RC   |   PT=SR=200   |             length            |
-	 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-	 */
-	rawPacket := make([]byte, headerLength)
-
-	if h.Version > 3 {
-		return nil, errInvalidVersion
-	}
-	rawPacket[0] |= h.Version << versionShift
-
-	if h.Padding {
-		rawPacket[0] |= 1 << paddingShift
-	}
-
-	if h.ReportCount > 31 {
-		return nil, errInvalidReportCount
-	}
-	rawPacket[0] |= h.ReportCount << reportCountShift
-
-	rawPacket[1] = h.Type
-
-	binary.BigEndian.PutUint16(rawPacket[2:], h.Length)
-
-	return rawPacket, nil
-}
-
-// Unmarshal decodes the Header from binary
-func (h *Header) Unmarshal(rawPacket []byte) error {
-	if len(rawPacket) < headerLength {
-		return errHeaderTooShort
-	}
-
-	/*
-	 *  0                   1                   2                   3
-	 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
-	 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-	 * |V=2|P|    RC   |   PT=SR=200   |             length            |
-	 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-	 */
-
-	h.Version = rawPacket[0] >> versionShift & versionMask
-	h.Padding = (rawPacket[0] >> paddingShift & paddingMask) > 0
-	h.ReportCount = rawPacket[0] >> reportCountShift & reportCountMask
-
-	h.Type = rawPacket[1]
-
-	h.Length = binary.BigEndian.Uint16(rawPacket[2:])
-
-	return nil
-}