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/*
* 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
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