Alfred E. Heggestad | b330a79 | 2024-01-08 13:19:41 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2023 The WebRTC project authors. All Rights Reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #include "api/video_codecs/h265_profile_tier_level.h" |
| 12 | |
| 13 | #include <string> |
| 14 | |
| 15 | #include "rtc_base/string_to_number.h" |
| 16 | |
| 17 | namespace webrtc { |
| 18 | |
| 19 | namespace { |
| 20 | |
| 21 | const char kH265FmtpProfile[] = "profile-id"; |
| 22 | const char kH265FmtpTier[] = "tier-flag"; |
| 23 | const char kH265FmtpLevel[] = "level-id"; |
| 24 | |
| 25 | } // anonymous namespace |
| 26 | |
| 27 | // Annex A of https://www.itu.int/rec/T-REC-H.265 (08/21), section A.3. |
| 28 | absl::optional<H265Profile> StringToH265Profile(const std::string& profile) { |
| 29 | absl::optional<int> i = rtc::StringToNumber<int>(profile); |
| 30 | if (!i.has_value()) { |
| 31 | return absl::nullopt; |
| 32 | } |
| 33 | |
| 34 | switch (i.value()) { |
| 35 | case 1: |
| 36 | return H265Profile::kProfileMain; |
| 37 | case 2: |
| 38 | return H265Profile::kProfileMain10; |
| 39 | case 3: |
| 40 | return H265Profile::kProfileMainStill; |
| 41 | case 4: |
| 42 | return H265Profile::kProfileRangeExtensions; |
| 43 | case 5: |
| 44 | return H265Profile::kProfileHighThroughput; |
| 45 | case 6: |
| 46 | return H265Profile::kProfileMultiviewMain; |
| 47 | case 7: |
| 48 | return H265Profile::kProfileScalableMain; |
| 49 | case 8: |
| 50 | return H265Profile::kProfile3dMain; |
| 51 | case 9: |
| 52 | return H265Profile::kProfileScreenContentCoding; |
| 53 | case 10: |
| 54 | return H265Profile::kProfileScalableRangeExtensions; |
| 55 | case 11: |
| 56 | return H265Profile::kProfileHighThroughputScreenContentCoding; |
| 57 | default: |
| 58 | return absl::nullopt; |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | // Annex A of https://www.itu.int/rec/T-REC-H.265 (08/21), section A.4, |
| 63 | // tiers and levels. |
| 64 | absl::optional<H265Tier> StringToH265Tier(const std::string& tier) { |
| 65 | absl::optional<int> i = rtc::StringToNumber<int>(tier); |
| 66 | if (!i.has_value()) { |
| 67 | return absl::nullopt; |
| 68 | } |
| 69 | |
| 70 | switch (i.value()) { |
| 71 | case 0: |
| 72 | return H265Tier::kTier0; |
| 73 | case 1: |
| 74 | return H265Tier::kTier1; |
| 75 | default: |
| 76 | return absl::nullopt; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | absl::optional<H265Level> StringToH265Level(const std::string& level) { |
| 81 | const absl::optional<int> i = rtc::StringToNumber<int>(level); |
| 82 | if (!i.has_value()) |
| 83 | return absl::nullopt; |
| 84 | |
| 85 | switch (i.value()) { |
| 86 | case 30: |
| 87 | return H265Level::kLevel1; |
| 88 | case 60: |
| 89 | return H265Level::kLevel2; |
| 90 | case 63: |
| 91 | return H265Level::kLevel2_1; |
| 92 | case 90: |
| 93 | return H265Level::kLevel3; |
| 94 | case 93: |
| 95 | return H265Level::kLevel3_1; |
| 96 | case 120: |
| 97 | return H265Level::kLevel4; |
| 98 | case 123: |
| 99 | return H265Level::kLevel4_1; |
| 100 | case 150: |
| 101 | return H265Level::kLevel5; |
| 102 | case 153: |
| 103 | return H265Level::kLevel5_1; |
| 104 | case 156: |
| 105 | return H265Level::kLevel5_2; |
| 106 | case 180: |
| 107 | return H265Level::kLevel6; |
| 108 | case 183: |
| 109 | return H265Level::kLevel6_1; |
| 110 | case 186: |
| 111 | return H265Level::kLevel6_2; |
| 112 | default: |
| 113 | return absl::nullopt; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | std::string H265ProfileToString(H265Profile profile) { |
| 118 | switch (profile) { |
| 119 | case H265Profile::kProfileMain: |
| 120 | return "1"; |
| 121 | case H265Profile::kProfileMain10: |
| 122 | return "2"; |
| 123 | case H265Profile::kProfileMainStill: |
| 124 | return "3"; |
| 125 | case H265Profile::kProfileRangeExtensions: |
| 126 | return "4"; |
| 127 | case H265Profile::kProfileHighThroughput: |
| 128 | return "5"; |
| 129 | case H265Profile::kProfileMultiviewMain: |
| 130 | return "6"; |
| 131 | case H265Profile::kProfileScalableMain: |
| 132 | return "7"; |
| 133 | case H265Profile::kProfile3dMain: |
| 134 | return "8"; |
| 135 | case H265Profile::kProfileScreenContentCoding: |
| 136 | return "9"; |
| 137 | case H265Profile::kProfileScalableRangeExtensions: |
| 138 | return "10"; |
| 139 | case H265Profile::kProfileHighThroughputScreenContentCoding: |
| 140 | return "11"; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | std::string H265TierToString(H265Tier tier) { |
| 145 | switch (tier) { |
| 146 | case H265Tier::kTier0: |
| 147 | return "0"; |
| 148 | case H265Tier::kTier1: |
| 149 | return "1"; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | std::string H265LevelToString(H265Level level) { |
| 154 | switch (level) { |
| 155 | case H265Level::kLevel1: |
| 156 | return "30"; |
| 157 | case H265Level::kLevel2: |
| 158 | return "60"; |
| 159 | case H265Level::kLevel2_1: |
| 160 | return "63"; |
| 161 | case H265Level::kLevel3: |
| 162 | return "90"; |
| 163 | case H265Level::kLevel3_1: |
| 164 | return "93"; |
| 165 | case H265Level::kLevel4: |
| 166 | return "120"; |
| 167 | case H265Level::kLevel4_1: |
| 168 | return "123"; |
| 169 | case H265Level::kLevel5: |
| 170 | return "150"; |
| 171 | case H265Level::kLevel5_1: |
| 172 | return "153"; |
| 173 | case H265Level::kLevel5_2: |
| 174 | return "156"; |
| 175 | case H265Level::kLevel6: |
| 176 | return "180"; |
| 177 | case H265Level::kLevel6_1: |
| 178 | return "183"; |
| 179 | case H265Level::kLevel6_2: |
| 180 | return "186"; |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | absl::optional<H265ProfileTierLevel> ParseSdpForH265ProfileTierLevel( |
| 185 | const CodecParameterMap& params) { |
| 186 | static const H265ProfileTierLevel kDefaultProfileTierLevel( |
| 187 | H265Profile::kProfileMain, H265Tier::kTier0, H265Level::kLevel3_1); |
| 188 | bool profile_tier_level_specified = false; |
| 189 | |
| 190 | absl::optional<H265Profile> profile; |
| 191 | const auto profile_it = params.find(kH265FmtpProfile); |
| 192 | if (profile_it != params.end()) { |
| 193 | profile_tier_level_specified = true; |
| 194 | const std::string& profile_str = profile_it->second; |
| 195 | profile = StringToH265Profile(profile_str); |
| 196 | if (!profile) { |
| 197 | return absl::nullopt; |
| 198 | } |
| 199 | } else { |
| 200 | profile = H265Profile::kProfileMain; |
| 201 | } |
| 202 | absl::optional<H265Tier> tier; |
| 203 | const auto tier_it = params.find(kH265FmtpTier); |
| 204 | if (tier_it != params.end()) { |
| 205 | profile_tier_level_specified = true; |
| 206 | const std::string& tier_str = tier_it->second; |
| 207 | tier = StringToH265Tier(tier_str); |
| 208 | if (!tier) { |
| 209 | return absl::nullopt; |
| 210 | } |
| 211 | } else { |
| 212 | tier = H265Tier::kTier0; |
| 213 | } |
| 214 | absl::optional<H265Level> level; |
| 215 | const auto level_it = params.find(kH265FmtpLevel); |
| 216 | if (level_it != params.end()) { |
| 217 | profile_tier_level_specified = true; |
| 218 | const std::string& level_str = level_it->second; |
| 219 | level = StringToH265Level(level_str); |
| 220 | if (!level) { |
| 221 | return absl::nullopt; |
| 222 | } |
| 223 | } else { |
| 224 | level = H265Level::kLevel3_1; |
| 225 | } |
| 226 | |
| 227 | // Spec Table A.9, level 1 to level 3.1 does not allow high tiers. |
| 228 | if (level <= H265Level::kLevel3_1 && tier == H265Tier::kTier1) { |
| 229 | return absl::nullopt; |
| 230 | } |
| 231 | |
| 232 | return !profile_tier_level_specified |
| 233 | ? kDefaultProfileTierLevel |
| 234 | : H265ProfileTierLevel(profile.value(), tier.value(), |
| 235 | level.value()); |
| 236 | } |
| 237 | |
| 238 | bool H265IsSameProfileTierLevel(const CodecParameterMap& params1, |
| 239 | const CodecParameterMap& params2) { |
| 240 | const absl::optional<H265ProfileTierLevel> ptl1 = |
| 241 | ParseSdpForH265ProfileTierLevel(params1); |
| 242 | const absl::optional<H265ProfileTierLevel> ptl2 = |
| 243 | ParseSdpForH265ProfileTierLevel(params2); |
| 244 | return ptl1 && ptl2 && ptl1->profile == ptl2->profile && |
| 245 | ptl1->tier == ptl2->tier && ptl1->level == ptl2->level; |
| 246 | } |
| 247 | |
| 248 | } // namespace webrtc |