Åsa Persson | f3d828e | 2019-05-06 12:22:49 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2019 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 "rtc_base/experiments/balanced_degradation_settings.h" |
| 12 | #include <limits> |
| 13 | |
| 14 | #include "rtc_base/experiments/field_trial_list.h" |
| 15 | #include "rtc_base/experiments/field_trial_parser.h" |
| 16 | #include "rtc_base/logging.h" |
| 17 | #include "system_wrappers/include/field_trial.h" |
| 18 | |
| 19 | namespace webrtc { |
| 20 | namespace { |
| 21 | constexpr char kFieldTrial[] = "WebRTC-Video-BalancedDegradationSettings"; |
| 22 | constexpr int kMinFps = 1; |
| 23 | constexpr int kMaxFps = 100; |
| 24 | |
| 25 | std::vector<BalancedDegradationSettings::Config> DefaultConfigs() { |
Åsa Persson | 1231419 | 2019-06-20 15:45:07 +0200 | [diff] [blame] | 26 | return {{320 * 240, 7, {0, 0}, {0, 0}, {0, 0}, {0, 0}}, |
| 27 | {480 * 270, 10, {0, 0}, {0, 0}, {0, 0}, {0, 0}}, |
| 28 | {640 * 480, 15, {0, 0}, {0, 0}, {0, 0}, {0, 0}}}; |
| 29 | } |
| 30 | |
| 31 | bool IsValidThreshold( |
| 32 | const BalancedDegradationSettings::QpThreshold& threshold) { |
| 33 | if (threshold.GetLow().has_value() != threshold.GetHigh().has_value()) { |
| 34 | RTC_LOG(LS_WARNING) << "Neither or both values should be set."; |
| 35 | return false; |
| 36 | } |
| 37 | if (threshold.GetLow().has_value() && threshold.GetHigh().has_value() && |
| 38 | threshold.GetLow().value() >= threshold.GetHigh().value()) { |
| 39 | RTC_LOG(LS_WARNING) << "Invalid threshold value, low >= high threshold."; |
| 40 | return false; |
| 41 | } |
| 42 | return true; |
Åsa Persson | f3d828e | 2019-05-06 12:22:49 +0200 | [diff] [blame] | 43 | } |
| 44 | |
| 45 | bool IsValid(const std::vector<BalancedDegradationSettings::Config>& configs) { |
| 46 | if (configs.size() <= 1) { |
| 47 | RTC_LOG(LS_WARNING) << "Unsupported size, value ignored."; |
| 48 | return false; |
| 49 | } |
| 50 | for (const auto& config : configs) { |
| 51 | if (config.fps < kMinFps || config.fps > kMaxFps) { |
| 52 | RTC_LOG(LS_WARNING) << "Unsupported fps setting, value ignored."; |
| 53 | return false; |
| 54 | } |
| 55 | } |
| 56 | for (size_t i = 1; i < configs.size(); ++i) { |
| 57 | if (configs[i].pixels < configs[i - 1].pixels || |
| 58 | configs[i].fps < configs[i - 1].fps) { |
Åsa Persson | 1231419 | 2019-06-20 15:45:07 +0200 | [diff] [blame] | 59 | RTC_LOG(LS_WARNING) << "Invalid fps/pixel value provided."; |
| 60 | return false; |
| 61 | } |
| 62 | if (((configs[i].vp8.low > 0) != (configs[i - 1].vp8.low > 0)) || |
| 63 | ((configs[i].vp9.low > 0) != (configs[i - 1].vp9.low > 0)) || |
| 64 | ((configs[i].h264.low > 0) != (configs[i - 1].h264.low > 0)) || |
| 65 | ((configs[i].generic.low > 0) != (configs[i - 1].generic.low > 0)) || |
| 66 | ((configs[i].vp8.high > 0) != (configs[i - 1].vp8.high > 0)) || |
| 67 | ((configs[i].vp9.high > 0) != (configs[i - 1].vp9.high > 0)) || |
| 68 | ((configs[i].h264.high > 0) != (configs[i - 1].h264.high > 0)) || |
| 69 | ((configs[i].generic.high > 0) != (configs[i - 1].generic.high > 0))) { |
| 70 | RTC_LOG(LS_WARNING) << "Invalid threshold value, all/none should be set."; |
| 71 | return false; |
| 72 | } |
| 73 | } |
| 74 | for (const auto& config : configs) { |
| 75 | if (!IsValidThreshold(config.vp8) || !IsValidThreshold(config.vp9) || |
| 76 | !IsValidThreshold(config.h264) || !IsValidThreshold(config.generic)) { |
Åsa Persson | f3d828e | 2019-05-06 12:22:49 +0200 | [diff] [blame] | 77 | return false; |
| 78 | } |
| 79 | } |
| 80 | return true; |
| 81 | } |
| 82 | |
| 83 | std::vector<BalancedDegradationSettings::Config> GetValidOrDefault( |
| 84 | const std::vector<BalancedDegradationSettings::Config>& configs) { |
| 85 | if (IsValid(configs)) { |
| 86 | return configs; |
| 87 | } |
| 88 | return DefaultConfigs(); |
| 89 | } |
Åsa Persson | 1231419 | 2019-06-20 15:45:07 +0200 | [diff] [blame] | 90 | |
| 91 | absl::optional<VideoEncoder::QpThresholds> GetThresholds( |
| 92 | VideoCodecType type, |
| 93 | const BalancedDegradationSettings::Config& config) { |
| 94 | absl::optional<int> low; |
| 95 | absl::optional<int> high; |
| 96 | |
| 97 | switch (type) { |
| 98 | case kVideoCodecVP8: |
| 99 | low = config.vp8.GetLow(); |
| 100 | high = config.vp8.GetHigh(); |
| 101 | break; |
| 102 | case kVideoCodecVP9: |
| 103 | low = config.vp9.GetLow(); |
| 104 | high = config.vp9.GetHigh(); |
| 105 | break; |
| 106 | case kVideoCodecH264: |
| 107 | low = config.h264.GetLow(); |
| 108 | high = config.h264.GetHigh(); |
| 109 | break; |
| 110 | case kVideoCodecGeneric: |
| 111 | low = config.generic.GetLow(); |
| 112 | high = config.generic.GetHigh(); |
| 113 | break; |
| 114 | default: |
| 115 | break; |
| 116 | } |
| 117 | |
| 118 | if (low && high) { |
| 119 | RTC_LOG(LS_INFO) << "QP thresholds: low: " << *low << ", high: " << *high; |
| 120 | return absl::optional<VideoEncoder::QpThresholds>( |
| 121 | VideoEncoder::QpThresholds(*low, *high)); |
| 122 | } |
| 123 | return absl::nullopt; |
| 124 | } |
Åsa Persson | f3d828e | 2019-05-06 12:22:49 +0200 | [diff] [blame] | 125 | } // namespace |
| 126 | |
Åsa Persson | 1231419 | 2019-06-20 15:45:07 +0200 | [diff] [blame] | 127 | absl::optional<int> BalancedDegradationSettings::QpThreshold::GetLow() const { |
| 128 | return (low > 0) ? absl::optional<int>(low) : absl::nullopt; |
| 129 | } |
| 130 | |
| 131 | absl::optional<int> BalancedDegradationSettings::QpThreshold::GetHigh() const { |
| 132 | return (high > 0) ? absl::optional<int>(high) : absl::nullopt; |
| 133 | } |
| 134 | |
Åsa Persson | f3d828e | 2019-05-06 12:22:49 +0200 | [diff] [blame] | 135 | BalancedDegradationSettings::Config::Config() = default; |
| 136 | |
Åsa Persson | 1231419 | 2019-06-20 15:45:07 +0200 | [diff] [blame] | 137 | BalancedDegradationSettings::Config::Config(int pixels, |
| 138 | int fps, |
| 139 | QpThreshold vp8, |
| 140 | QpThreshold vp9, |
| 141 | QpThreshold h264, |
| 142 | QpThreshold generic) |
| 143 | : pixels(pixels), |
| 144 | fps(fps), |
| 145 | vp8(vp8), |
| 146 | vp9(vp9), |
| 147 | h264(h264), |
| 148 | generic(generic) {} |
Åsa Persson | f3d828e | 2019-05-06 12:22:49 +0200 | [diff] [blame] | 149 | |
| 150 | BalancedDegradationSettings::BalancedDegradationSettings() { |
| 151 | FieldTrialStructList<Config> configs( |
| 152 | {FieldTrialStructMember("pixels", [](Config* c) { return &c->pixels; }), |
Åsa Persson | 1231419 | 2019-06-20 15:45:07 +0200 | [diff] [blame] | 153 | FieldTrialStructMember("fps", [](Config* c) { return &c->fps; }), |
| 154 | FieldTrialStructMember("vp8_qp_low", |
| 155 | [](Config* c) { return &c->vp8.low; }), |
| 156 | FieldTrialStructMember("vp8_qp_high", |
| 157 | [](Config* c) { return &c->vp8.high; }), |
| 158 | FieldTrialStructMember("vp9_qp_low", |
| 159 | [](Config* c) { return &c->vp9.low; }), |
| 160 | FieldTrialStructMember("vp9_qp_high", |
| 161 | [](Config* c) { return &c->vp9.high; }), |
| 162 | FieldTrialStructMember("h264_qp_low", |
| 163 | [](Config* c) { return &c->h264.low; }), |
| 164 | FieldTrialStructMember("h264_qp_high", |
| 165 | [](Config* c) { return &c->h264.high; }), |
| 166 | FieldTrialStructMember("generic_qp_low", |
| 167 | [](Config* c) { return &c->generic.low; }), |
| 168 | FieldTrialStructMember("generic_qp_high", |
| 169 | [](Config* c) { return &c->generic.high; })}, |
Åsa Persson | f3d828e | 2019-05-06 12:22:49 +0200 | [diff] [blame] | 170 | {}); |
| 171 | |
| 172 | ParseFieldTrial({&configs}, field_trial::FindFullName(kFieldTrial)); |
| 173 | |
| 174 | configs_ = GetValidOrDefault(configs.Get()); |
| 175 | RTC_DCHECK_GT(configs_.size(), 1); |
| 176 | } |
| 177 | |
| 178 | BalancedDegradationSettings::~BalancedDegradationSettings() {} |
| 179 | |
| 180 | std::vector<BalancedDegradationSettings::Config> |
| 181 | BalancedDegradationSettings::GetConfigs() const { |
| 182 | return configs_; |
| 183 | } |
| 184 | |
| 185 | int BalancedDegradationSettings::MinFps(int pixels) const { |
| 186 | for (const auto& config : configs_) { |
| 187 | if (pixels <= config.pixels) |
| 188 | return config.fps; |
| 189 | } |
| 190 | return std::numeric_limits<int>::max(); |
| 191 | } |
| 192 | |
| 193 | int BalancedDegradationSettings::MaxFps(int pixels) const { |
| 194 | for (size_t i = 0; i < configs_.size() - 1; ++i) { |
| 195 | if (pixels <= configs_[i].pixels) |
| 196 | return configs_[i + 1].fps; |
| 197 | } |
| 198 | return std::numeric_limits<int>::max(); |
| 199 | } |
| 200 | |
Åsa Persson | 1231419 | 2019-06-20 15:45:07 +0200 | [diff] [blame] | 201 | absl::optional<VideoEncoder::QpThresholds> |
| 202 | BalancedDegradationSettings::GetQpThresholds(VideoCodecType type, |
| 203 | int pixels) const { |
| 204 | return GetThresholds(type, GetConfig(pixels)); |
| 205 | } |
| 206 | |
| 207 | BalancedDegradationSettings::Config BalancedDegradationSettings::GetConfig( |
| 208 | int pixels) const { |
| 209 | for (const auto& config : configs_) { |
| 210 | if (pixels <= config.pixels) |
| 211 | return config; |
| 212 | } |
| 213 | return configs_.back(); // Use last above highest pixels. |
| 214 | } |
| 215 | |
Åsa Persson | f3d828e | 2019-05-06 12:22:49 +0200 | [diff] [blame] | 216 | } // namespace webrtc |