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