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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.
*/
#include "api/video_codecs/h265_profile_tier_level.h"
#include <string>
#include "rtc_base/string_to_number.h"
namespace webrtc {
namespace {
const char kH265FmtpProfile[] = "profile-id";
const char kH265FmtpTier[] = "tier-flag";
const char kH265FmtpLevel[] = "level-id";
} // anonymous namespace
// Annex A of https://www.itu.int/rec/T-REC-H.265 (08/21), section A.3.
absl::optional<H265Profile> StringToH265Profile(const std::string& profile) {
absl::optional<int> i = rtc::StringToNumber<int>(profile);
if (!i.has_value()) {
return absl::nullopt;
}
switch (i.value()) {
case 1:
return H265Profile::kProfileMain;
case 2:
return H265Profile::kProfileMain10;
case 3:
return H265Profile::kProfileMainStill;
case 4:
return H265Profile::kProfileRangeExtensions;
case 5:
return H265Profile::kProfileHighThroughput;
case 6:
return H265Profile::kProfileMultiviewMain;
case 7:
return H265Profile::kProfileScalableMain;
case 8:
return H265Profile::kProfile3dMain;
case 9:
return H265Profile::kProfileScreenContentCoding;
case 10:
return H265Profile::kProfileScalableRangeExtensions;
case 11:
return H265Profile::kProfileHighThroughputScreenContentCoding;
default:
return absl::nullopt;
}
}
// Annex A of https://www.itu.int/rec/T-REC-H.265 (08/21), section A.4,
// tiers and levels.
absl::optional<H265Tier> StringToH265Tier(const std::string& tier) {
absl::optional<int> i = rtc::StringToNumber<int>(tier);
if (!i.has_value()) {
return absl::nullopt;
}
switch (i.value()) {
case 0:
return H265Tier::kTier0;
case 1:
return H265Tier::kTier1;
default:
return absl::nullopt;
}
}
absl::optional<H265Level> StringToH265Level(const std::string& level) {
const absl::optional<int> i = rtc::StringToNumber<int>(level);
if (!i.has_value())
return absl::nullopt;
switch (i.value()) {
case 30:
return H265Level::kLevel1;
case 60:
return H265Level::kLevel2;
case 63:
return H265Level::kLevel2_1;
case 90:
return H265Level::kLevel3;
case 93:
return H265Level::kLevel3_1;
case 120:
return H265Level::kLevel4;
case 123:
return H265Level::kLevel4_1;
case 150:
return H265Level::kLevel5;
case 153:
return H265Level::kLevel5_1;
case 156:
return H265Level::kLevel5_2;
case 180:
return H265Level::kLevel6;
case 183:
return H265Level::kLevel6_1;
case 186:
return H265Level::kLevel6_2;
default:
return absl::nullopt;
}
}
std::string H265ProfileToString(H265Profile profile) {
switch (profile) {
case H265Profile::kProfileMain:
return "1";
case H265Profile::kProfileMain10:
return "2";
case H265Profile::kProfileMainStill:
return "3";
case H265Profile::kProfileRangeExtensions:
return "4";
case H265Profile::kProfileHighThroughput:
return "5";
case H265Profile::kProfileMultiviewMain:
return "6";
case H265Profile::kProfileScalableMain:
return "7";
case H265Profile::kProfile3dMain:
return "8";
case H265Profile::kProfileScreenContentCoding:
return "9";
case H265Profile::kProfileScalableRangeExtensions:
return "10";
case H265Profile::kProfileHighThroughputScreenContentCoding:
return "11";
}
}
std::string H265TierToString(H265Tier tier) {
switch (tier) {
case H265Tier::kTier0:
return "0";
case H265Tier::kTier1:
return "1";
}
}
std::string H265LevelToString(H265Level level) {
switch (level) {
case H265Level::kLevel1:
return "30";
case H265Level::kLevel2:
return "60";
case H265Level::kLevel2_1:
return "63";
case H265Level::kLevel3:
return "90";
case H265Level::kLevel3_1:
return "93";
case H265Level::kLevel4:
return "120";
case H265Level::kLevel4_1:
return "123";
case H265Level::kLevel5:
return "150";
case H265Level::kLevel5_1:
return "153";
case H265Level::kLevel5_2:
return "156";
case H265Level::kLevel6:
return "180";
case H265Level::kLevel6_1:
return "183";
case H265Level::kLevel6_2:
return "186";
}
}
absl::optional<H265ProfileTierLevel> ParseSdpForH265ProfileTierLevel(
const CodecParameterMap& params) {
static const H265ProfileTierLevel kDefaultProfileTierLevel(
H265Profile::kProfileMain, H265Tier::kTier0, H265Level::kLevel3_1);
bool profile_tier_level_specified = false;
absl::optional<H265Profile> profile;
const auto profile_it = params.find(kH265FmtpProfile);
if (profile_it != params.end()) {
profile_tier_level_specified = true;
const std::string& profile_str = profile_it->second;
profile = StringToH265Profile(profile_str);
if (!profile) {
return absl::nullopt;
}
} else {
profile = H265Profile::kProfileMain;
}
absl::optional<H265Tier> tier;
const auto tier_it = params.find(kH265FmtpTier);
if (tier_it != params.end()) {
profile_tier_level_specified = true;
const std::string& tier_str = tier_it->second;
tier = StringToH265Tier(tier_str);
if (!tier) {
return absl::nullopt;
}
} else {
tier = H265Tier::kTier0;
}
absl::optional<H265Level> level;
const auto level_it = params.find(kH265FmtpLevel);
if (level_it != params.end()) {
profile_tier_level_specified = true;
const std::string& level_str = level_it->second;
level = StringToH265Level(level_str);
if (!level) {
return absl::nullopt;
}
} else {
level = H265Level::kLevel3_1;
}
// Spec Table A.9, level 1 to level 3.1 does not allow high tiers.
if (level <= H265Level::kLevel3_1 && tier == H265Tier::kTier1) {
return absl::nullopt;
}
return !profile_tier_level_specified
? kDefaultProfileTierLevel
: H265ProfileTierLevel(profile.value(), tier.value(),
level.value());
}
bool H265IsSameProfileTierLevel(const CodecParameterMap& params1,
const CodecParameterMap& params2) {
const absl::optional<H265ProfileTierLevel> ptl1 =
ParseSdpForH265ProfileTierLevel(params1);
const absl::optional<H265ProfileTierLevel> ptl2 =
ParseSdpForH265ProfileTierLevel(params2);
return ptl1 && ptl2 && ptl1->profile == ptl2->profile &&
ptl1->tier == ptl2->tier && ptl1->level == ptl2->level;
}
} // namespace webrtc
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