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diff --git a/third_party/libwebrtc/api/video_codecs/h265_profile_tier_level.h b/third_party/libwebrtc/api/video_codecs/h265_profile_tier_level.h
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+/*
+ *  Copyright (c) 2023 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef API_VIDEO_CODECS_H265_PROFILE_TIER_LEVEL_H_
+#define API_VIDEO_CODECS_H265_PROFILE_TIER_LEVEL_H_
+
+#include <string>
+
+#include "absl/types/optional.h"
+#include "api/video_codecs/sdp_video_format.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+// Profiles can be found at:
+// https://www.itu.int/rec/T-REC-H.265
+// The enum values match the number specified in the SDP.
+enum class H265Profile {
+  kProfileMain = 1,
+  kProfileMain10 = 2,
+  kProfileMainStill = 3,
+  kProfileRangeExtensions = 4,
+  kProfileHighThroughput = 5,
+  kProfileMultiviewMain = 6,
+  kProfileScalableMain = 7,
+  kProfile3dMain = 8,
+  kProfileScreenContentCoding = 9,
+  kProfileScalableRangeExtensions = 10,
+  kProfileHighThroughputScreenContentCoding = 11,
+};
+
+// Tiers can be found at https://www.itu.int/rec/T-REC-H.265
+enum class H265Tier {
+  kTier0,
+  kTier1,
+};
+
+// All values are equal to 30 times the level number.
+enum class H265Level {
+  kLevel1 = 30,
+  kLevel2 = 60,
+  kLevel2_1 = 63,
+  kLevel3 = 90,
+  kLevel3_1 = 93,
+  kLevel4 = 120,
+  kLevel4_1 = 123,
+  kLevel5 = 150,
+  kLevel5_1 = 153,
+  kLevel5_2 = 156,
+  kLevel6 = 180,
+  kLevel6_1 = 183,
+  kLevel6_2 = 186,
+};
+
+struct H265ProfileTierLevel {
+  constexpr H265ProfileTierLevel(H265Profile profile,
+                                 H265Tier tier,
+                                 H265Level level)
+      : profile(profile), tier(tier), level(level) {}
+  H265Profile profile;
+  H265Tier tier;
+  H265Level level;
+};
+
+// Helper function to convert H265Profile to std::string.
+RTC_EXPORT std::string H265ProfileToString(H265Profile profile);
+
+// Helper function to convert H265Tier to std::string.
+RTC_EXPORT std::string H265TierToString(H265Tier tier);
+
+// Helper function to convert H265Level to std::string.
+RTC_EXPORT std::string H265LevelToString(H265Level level);
+
+// Helper function to get H265Profile from profile string.
+RTC_EXPORT absl::optional<H265Profile> StringToH265Profile(
+    const std::string& profile);
+
+// Helper function to get H265Tier from tier string.
+RTC_EXPORT absl::optional<H265Tier> StringToH265Tier(const std::string& tier);
+
+// Helper function to get H265Level from level string.
+RTC_EXPORT absl::optional<H265Level> StringToH265Level(
+    const std::string& level);
+
+// Parses an SDP key-value map of format parameters to retrive an H265
+// profile/tier/level. Returns an H265ProfileTierlevel by setting its
+// members. profile defaults to `kProfileMain` if no profile-id is specified.
+// tier defaults to "kTier0" if no tier-flag is specified.
+// level defaults to "kLevel3_1" if no level-id is specified.
+// Returns empty value if any of the profile/tier/level key is present but
+// contains an invalid value.
+RTC_EXPORT absl::optional<H265ProfileTierLevel> ParseSdpForH265ProfileTierLevel(
+    const SdpVideoFormat::Parameters& params);
+
+// Returns true if the parameters have the same H265 profile or neither contains
+// an H265 profile, otherwise false.
+bool H265IsSameProfileTierLevel(const SdpVideoFormat::Parameters& params1,
+                                const SdpVideoFormat::Parameters& params2);
+
+}  // namespace webrtc
+
+#endif  // API_VIDEO_CODECS_H265_PROFILE_TIER_LEVEL_H_