1 files changed, 146 insertions, 0 deletions
diff --git a/vendor/github.com/pion/rtcp/goodbye.go b/vendor/github.com/pion/rtcp/goodbye.go
new file mode 100644
index 0000000..b8718b3
--- /dev/null
+++ b/vendor/github.com/pion/rtcp/goodbye.go
@@ -0,0 +1,146 @@
+package rtcp
+
+import (
+	"encoding/binary"
+)
+
+// The Goodbye packet indicates that one or more sources are no longer active.
+type Goodbye struct {
+	// The SSRC/CSRC identifiers that are no longer active
+	Sources []uint32
+	// Optional text indicating the reason for leaving, e.g., "camera malfunction" or "RTP loop detected"
+	Reason string
+}
+
+var _ Packet = (*Goodbye)(nil) // assert is a Packet
+
+// Marshal encodes the Goodbye packet in binary
+func (g Goodbye) 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|    SC   |   PT=BYE=203  |             length            |
+	 *       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+	 *       |                           SSRC/CSRC                           |
+	 *       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+	 *       :                              ...                              :
+	 *       +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
+	 * (opt) |     length    |               reason for leaving            ...
+	 *       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+	 */
+
+	rawPacket := make([]byte, g.len())
+	packetBody := rawPacket[headerLength:]
+
+	if len(g.Sources) > countMax {
+		return nil, errTooManySources
+	}
+
+	for i, s := range g.Sources {
+		binary.BigEndian.PutUint32(packetBody[i*ssrcLength:], s)
+	}
+
+	if g.Reason != "" {
+		reason := []byte(g.Reason)
+
+		if len(reason) > sdesMaxOctetCount {
+			return nil, errReasonTooLong
+		}
+
+		reasonOffset := len(g.Sources) * ssrcLength
+		packetBody[reasonOffset] = uint8(len(reason))
+		copy(packetBody[reasonOffset+1:], reason)
+	}
+
+	hData, err := g.Header().Marshal()
+	if err != nil {
+		return nil, err
+	}
+	copy(rawPacket, hData)
+
+	return rawPacket, nil
+}
+
+// Unmarshal decodes the Goodbye packet from binary
+func (g *Goodbye) Unmarshal(rawPacket []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|    SC   |   PT=BYE=203  |             length            |
+	 *       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+	 *       |                           SSRC/CSRC                           |
+	 *       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+	 *       :                              ...                              :
+	 *       +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
+	 * (opt) |     length    |               reason for leaving            ...
+	 *       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+	 */
+
+	var header Header
+	if err := header.Unmarshal(rawPacket); err != nil {
+		return err
+	}
+
+	if header.Type != TypeGoodbye {
+		return errWrongType
+	}
+
+	if getPadding(len(rawPacket)) != 0 {
+		return errPacketTooShort
+	}
+
+	g.Sources = make([]uint32, header.Count)
+
+	reasonOffset := int(headerLength + header.Count*ssrcLength)
+	if reasonOffset > len(rawPacket) {
+		return errPacketTooShort
+	}
+
+	for i := 0; i < int(header.Count); i++ {
+		offset := headerLength + i*ssrcLength
+
+		g.Sources[i] = binary.BigEndian.Uint32(rawPacket[offset:])
+	}
+
+	if reasonOffset < len(rawPacket) {
+		reasonLen := int(rawPacket[reasonOffset])
+		reasonEnd := reasonOffset + 1 + reasonLen
+
+		if reasonEnd > len(rawPacket) {
+			return errPacketTooShort
+		}
+
+		g.Reason = string(rawPacket[reasonOffset+1 : reasonEnd])
+	}
+
+	return nil
+}
+
+// Header returns the Header associated with this packet.
+func (g *Goodbye) Header() Header {
+	return Header{
+		Padding: false,
+		Count:   uint8(len(g.Sources)),
+		Type:    TypeGoodbye,
+		Length:  uint16((g.len() / 4) - 1),
+	}
+}
+
+func (g *Goodbye) len() int {
+	srcsLength := len(g.Sources) * ssrcLength
+	reasonLength := len(g.Reason) + 1
+
+	l := headerLength + srcsLength + reasonLength
+
+	// align to 32-bit boundary
+	return l + getPadding(l)
+}
+
+// DestinationSSRC returns an array of SSRC values that this packet refers to.
+func (g *Goodbye) DestinationSSRC() []uint32 {
+	out := make([]uint32, len(g.Sources))
+	copy(out, g.Sources)
+	return out
+}