1 files changed, 49 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/experiments/normalize_simulcast_size_experiment.cc b/third_party/libwebrtc/rtc_base/experiments/normalize_simulcast_size_experiment.cc
new file mode 100644
index 0000000000..ce817a0797
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/experiments/normalize_simulcast_size_experiment.cc
@@ -0,0 +1,49 @@
+/*
+ *  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/normalize_simulcast_size_experiment.h"
+
+#include <stdio.h>
+
+#include <string>
+
+#include "rtc_base/logging.h"
+#include "system_wrappers/include/field_trial.h"
+
+namespace webrtc {
+namespace {
+constexpr char kFieldTrial[] = "WebRTC-NormalizeSimulcastResolution";
+constexpr int kMinSetting = 0;
+constexpr int kMaxSetting = 5;
+}  // namespace
+
+absl::optional<int> NormalizeSimulcastSizeExperiment::GetBase2Exponent() {
+  if (!webrtc::field_trial::IsEnabled(kFieldTrial))
+    return absl::nullopt;
+
+  const std::string group = webrtc::field_trial::FindFullName(kFieldTrial);
+  if (group.empty())
+    return absl::nullopt;
+
+  int exponent;
+  if (sscanf(group.c_str(), "Enabled-%d", &exponent) != 1) {
+    RTC_LOG(LS_WARNING) << "No parameter provided.";
+    return absl::nullopt;
+  }
+
+  if (exponent < kMinSetting || exponent > kMaxSetting) {
+    RTC_LOG(LS_WARNING) << "Unsupported exp value provided, value ignored.";
+    return absl::nullopt;
+  }
+
+  return absl::optional<int>(exponent);
+}
+
+}  // namespace webrtc