snapshot of https://github.com/pion/webrtc.git (main, 2026-09-15; blobs > 131072B omitted)

pkg/media/samplebuilder/sampleSequenceLocation.go

@@ -0,0 +1,54 @@
+// SPDX-FileCopyrightText: 2026 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+// Package samplebuilder provides functionality to reconstruct media frames from RTP packets.
+package samplebuilder
+
+type sampleSequenceLocation struct {
+	// head is the first packet in a sequence
+	head uint16
+	// tail is always set to one after the final sequence number,
+	// so if head == tail then the sequence is empty
+	tail uint16
+}
+
+func (l sampleSequenceLocation) empty() bool {
+	return l.head == l.tail
+}
+
+func (l sampleSequenceLocation) hasData() bool {
+	return l.head != l.tail
+}
+
+func (l sampleSequenceLocation) count() uint16 {
+	return seqnumDistance(l.head, l.tail)
+}
+
+const (
+	slCompareVoid = iota
+	slCompareBefore
+	slCompareInside
+	slCompareAfter
+)
+
+func (l sampleSequenceLocation) compare(pos uint16) int {
+	if l.head == l.tail {
+		return slCompareVoid
+	}
+
+	if l.head < l.tail {
+		if l.head <= pos && pos < l.tail {
+			return slCompareInside
+		}
+	} else {
+		if l.head <= pos || pos < l.tail {
+			return slCompareInside
+		}
+	}
+
+	if l.head-pos <= pos-l.tail {
+		return slCompareBefore
+	}
+
+	return slCompareAfter
+}