1 files changed, 91 insertions, 0 deletions
diff --git a/vendor/github.com/pion/rtp/packetizer.go b/vendor/github.com/pion/rtp/packetizer.go
new file mode 100644
index 0000000..5a8482f
--- /dev/null
+++ b/vendor/github.com/pion/rtp/packetizer.go
@@ -0,0 +1,91 @@
+package rtp
+
+import (
+	"time"
+)
+
+// Payloader payloads a byte array for use as rtp.Packet payloads
+type Payloader interface {
+	Payload(mtu int, payload []byte) [][]byte
+}
+
+// Packetizer packetizes a payload
+type Packetizer interface {
+	Packetize(payload []byte, samples uint32) []*Packet
+	EnableAbsSendTime(value int)
+}
+
+type packetizer struct {
+	MTU              int
+	PayloadType      uint8
+	SSRC             uint32
+	Payloader        Payloader
+	Sequencer        Sequencer
+	Timestamp        uint32
+	ClockRate        uint32
+	extensionNumbers struct { // put extension numbers in here. If they're 0, the extension is disabled (0 is not a legal extension number)
+		AbsSendTime int // http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
+	}
+	timegen func() time.Time
+}
+
+// NewPacketizer returns a new instance of a Packetizer for a specific payloader
+func NewPacketizer(mtu int, pt uint8, ssrc uint32, payloader Payloader, sequencer Sequencer, clockRate uint32) Packetizer {
+	return &packetizer{
+		MTU:         mtu,
+		PayloadType: pt,
+		SSRC:        ssrc,
+		Payloader:   payloader,
+		Sequencer:   sequencer,
+		Timestamp:   globalMathRandomGenerator.Uint32(),
+		ClockRate:   clockRate,
+		timegen:     time.Now,
+	}
+}
+
+func (p *packetizer) EnableAbsSendTime(value int) {
+	p.extensionNumbers.AbsSendTime = value
+}
+
+// Packetize packetizes the payload of an RTP packet and returns one or more RTP packets
+func (p *packetizer) Packetize(payload []byte, samples uint32) []*Packet {
+	// Guard against an empty payload
+	if len(payload) == 0 {
+		return nil
+	}
+
+	payloads := p.Payloader.Payload(p.MTU-12, payload)
+	packets := make([]*Packet, len(payloads))
+
+	for i, pp := range payloads {
+		packets[i] = &Packet{
+			Header: Header{
+				Version:        2,
+				Padding:        false,
+				Extension:      false,
+				Marker:         i == len(payloads)-1,
+				PayloadType:    p.PayloadType,
+				SequenceNumber: p.Sequencer.NextSequenceNumber(),
+				Timestamp:      p.Timestamp, // Figure out how to do timestamps
+				SSRC:           p.SSRC,
+			},
+			Payload: pp,
+		}
+	}
+	p.Timestamp += samples
+
+	if len(packets) != 0 && p.extensionNumbers.AbsSendTime != 0 {
+		sendTime := NewAbsSendTimeExtension(p.timegen())
+		// apply http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
+		b, err := sendTime.Marshal()
+		if err != nil {
+			return nil // never happens
+		}
+		err = packets[len(packets)-1].SetExtension(uint8(p.extensionNumbers.AbsSendTime), b)
+		if err != nil {
+			return nil // never happens
+		}
+	}
+
+	return packets
+}