73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
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/*
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* Copyright 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "rtc_base/experiments/cpu_speed_experiment.h"
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#include <stdio.h>
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#include <string>
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#include "rtc_base/logging.h"
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#include "system_wrappers/include/field_trial.h"
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namespace webrtc {
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namespace {
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constexpr char kFieldTrial[] = "WebRTC-VP8-CpuSpeed-Arm";
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constexpr int kMinSetting = -16;
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constexpr int kMaxSetting = -1;
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} // namespace
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absl::optional<std::vector<CpuSpeedExperiment::Config>>
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CpuSpeedExperiment::GetConfigs() {
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if (!webrtc::field_trial::IsEnabled(kFieldTrial))
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return absl::nullopt;
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const std::string group = webrtc::field_trial::FindFullName(kFieldTrial);
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if (group.empty())
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return absl::nullopt;
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std::vector<Config> configs(3);
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if (sscanf(group.c_str(), "Enabled-%d,%d,%d,%d,%d,%d", &(configs[0].pixels),
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&(configs[0].cpu_speed), &(configs[1].pixels),
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&(configs[1].cpu_speed), &(configs[2].pixels),
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&(configs[2].cpu_speed)) != 6) {
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RTC_LOG(LS_WARNING) << "Too few parameters provided.";
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return absl::nullopt;
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}
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for (const auto& config : configs) {
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if (config.cpu_speed < kMinSetting || config.cpu_speed > kMaxSetting) {
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RTC_LOG(LS_WARNING) << "Unsupported cpu speed setting, value ignored.";
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return absl::nullopt;
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}
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}
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for (size_t i = 1; i < configs.size(); ++i) {
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if (configs[i].pixels < configs[i - 1].pixels ||
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configs[i].cpu_speed > configs[i - 1].cpu_speed) {
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RTC_LOG(LS_WARNING) << "Invalid parameter value provided.";
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return absl::nullopt;
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}
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}
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return absl::optional<std::vector<Config>>(configs);
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}
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int CpuSpeedExperiment::GetValue(int pixels,
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const std::vector<Config>& configs) {
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for (const auto& config : configs) {
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if (pixels <= config.pixels)
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return config.cpu_speed;
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}
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return kMinSetting;
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}
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} // namespace webrtc
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