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

internal/fmtp/h265.go

@@ -0,0 +1,57 @@
+// SPDX-FileCopyrightText: 2026 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package fmtp
+
+import "strings"
+
+type h265FMTP struct {
+	parameters map[string]string
+}
+
+func (h *h265FMTP) MimeType() string {
+	return "video/h265"
+}
+
+// Match returns true if h and b describe compatible H.265 media formats.
+// draft-ietf-avtcore-hevc-webrtc-09 Section 2.1 defines profile-id,
+// tier-flag, and tx-mode as the H.265 media format parameters for WebRTC:
+// https://datatracker.ietf.org/doc/html/draft-ietf-avtcore-hevc-webrtc-09#section-2.1
+//
+// level-id is intentionally not compared, as required by W3C WebRTC candidate
+// correction 52:
+// https://www.w3.org/TR/webrtc/#codec-match-without-level-id
+// RFC 7798 Section 7.2.2 permits an answer to lower it, so treating it as a
+// symmetric parameter would reject a valid offer/answer exchange:
+// https://www.rfc-editor.org/rfc/rfc7798.html#section-7.2.2
+func (h *h265FMTP) Match(b FMTP) bool {
+	fmtp, ok := b.(*h265FMTP)
+	if !ok {
+		return false
+	}
+
+	return strings.EqualFold(
+		h.parameterOrDefault("profile-id", "1"),
+		fmtp.parameterOrDefault("profile-id", "1"),
+	) && strings.EqualFold(
+		h.parameterOrDefault("tier-flag", "0"),
+		fmtp.parameterOrDefault("tier-flag", "0"),
+	) && strings.EqualFold(
+		h.parameterOrDefault("tx-mode", "SRST"),
+		fmtp.parameterOrDefault("tx-mode", "SRST"),
+	)
+}
+
+func (h *h265FMTP) Parameter(key string) (string, bool) {
+	v, ok := h.parameters[key]
+
+	return v, ok
+}
+
+func (h *h265FMTP) parameterOrDefault(key, defaultValue string) string {
+	if value, ok := h.Parameter(key); ok {
+		return value
+	}
+
+	return defaultValue
+}