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