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server/vendor/github.com/pion/rtp/playoutdelayextension.go

@@ -0,0 +1,50 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package rtp
+
+import (
+	"encoding/binary"
+	"errors"
+)
+
+const (
+	playoutDelayExtensionSize = 3
+	playoutDelayMaxValue      = (1 << 12) - 1
+)
+
+var errPlayoutDelayInvalidValue = errors.New("invalid playout delay value")
+
+// PlayoutDelayExtension is a extension payload format in
+// http://www.webrtc.org/experiments/rtp-hdrext/playout-delay
+// 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
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |  ID   | len=2 |       MIN delay       |       MAX delay       |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+type PlayoutDelayExtension struct {
+	minDelay, maxDelay uint16
+}
+
+// Marshal serializes the members to buffer
+func (p PlayoutDelayExtension) Marshal() ([]byte, error) {
+	if p.minDelay > playoutDelayMaxValue || p.maxDelay > playoutDelayMaxValue {
+		return nil, errPlayoutDelayInvalidValue
+	}
+
+	return []byte{
+		byte(p.minDelay >> 4),
+		byte(p.minDelay<<4) | byte(p.maxDelay>>8),
+		byte(p.maxDelay),
+	}, nil
+}
+
+// Unmarshal parses the passed byte slice and stores the result in the members
+func (p *PlayoutDelayExtension) Unmarshal(rawData []byte) error {
+	if len(rawData) < playoutDelayExtensionSize {
+		return errTooSmall
+	}
+	p.minDelay = binary.BigEndian.Uint16(rawData[0:2]) >> 4
+	p.maxDelay = binary.BigEndian.Uint16(rawData[1:3]) & 0x0FFF
+	return nil
+}