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Diffstat (limited to '')
-rw-r--r-- | third_party/libwebrtc/rtc_base/experiments/cpu_speed_experiment.cc | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/experiments/cpu_speed_experiment.cc b/third_party/libwebrtc/rtc_base/experiments/cpu_speed_experiment.cc new file mode 100644 index 0000000000..7e61255260 --- /dev/null +++ b/third_party/libwebrtc/rtc_base/experiments/cpu_speed_experiment.cc @@ -0,0 +1,89 @@ +/* + * Copyright 2018 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 "rtc_base/experiments/cpu_speed_experiment.h" + +#include <stdio.h> + +#include "rtc_base/experiments/field_trial_list.h" +#include "rtc_base/logging.h" +#include "system_wrappers/include/field_trial.h" + +namespace webrtc { +namespace { +constexpr char kFieldTrial[] = "WebRTC-VP8-CpuSpeed-Arm"; +constexpr int kMinSetting = -16; +constexpr int kMaxSetting = -1; + +std::vector<CpuSpeedExperiment::Config> GetValidOrEmpty( + const std::vector<CpuSpeedExperiment::Config>& configs) { + if (configs.empty()) { + return {}; + } + + for (const auto& config : configs) { + if (config.cpu_speed < kMinSetting || config.cpu_speed > kMaxSetting) { + RTC_LOG(LS_WARNING) << "Unsupported cpu speed setting, value ignored."; + return {}; + } + } + + for (size_t i = 1; i < configs.size(); ++i) { + if (configs[i].pixels < configs[i - 1].pixels || + configs[i].cpu_speed > configs[i - 1].cpu_speed) { + RTC_LOG(LS_WARNING) << "Invalid parameter value provided."; + return {}; + } + } + + return configs; +} + +bool HasLeCores(const std::vector<CpuSpeedExperiment::Config>& configs) { + for (const auto& config : configs) { + if (config.cpu_speed_le_cores == 0) + return false; + } + return true; +} +} // namespace + +CpuSpeedExperiment::CpuSpeedExperiment() : cores_("cores") { + FieldTrialStructList<Config> configs( + {FieldTrialStructMember("pixels", [](Config* c) { return &c->pixels; }), + FieldTrialStructMember("cpu_speed", + [](Config* c) { return &c->cpu_speed; }), + FieldTrialStructMember( + "cpu_speed_le_cores", + [](Config* c) { return &c->cpu_speed_le_cores; })}, + {}); + ParseFieldTrial({&configs, &cores_}, field_trial::FindFullName(kFieldTrial)); + + configs_ = GetValidOrEmpty(configs.Get()); +} + +CpuSpeedExperiment::~CpuSpeedExperiment() {} + +absl::optional<int> CpuSpeedExperiment::GetValue(int pixels, + int num_cores) const { + if (configs_.empty()) + return absl::nullopt; + + bool use_le = HasLeCores(configs_) && cores_ && num_cores <= cores_.Value(); + + for (const auto& config : configs_) { + if (pixels <= config.pixels) + return use_le ? absl::optional<int>(config.cpu_speed_le_cores) + : absl::optional<int>(config.cpu_speed); + } + return absl::optional<int>(kMinSetting); +} + +} // namespace webrtc |