1 files changed, 49 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/numerics/event_rate_counter.cc b/third_party/libwebrtc/rtc_base/numerics/event_rate_counter.cc
new file mode 100644
index 0000000000..d7b7293918
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/numerics/event_rate_counter.cc
@@ -0,0 +1,49 @@
+/*
+ *  Copyright (c) 2019 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/numerics/event_rate_counter.h"
+
+#include <algorithm>
+
+namespace webrtc {
+
+void EventRateCounter::AddEvent(Timestamp event_time) {
+  if (first_time_.IsFinite())
+    interval_.AddSample(event_time - last_time_);
+  first_time_ = std::min(first_time_, event_time);
+  last_time_ = std::max(last_time_, event_time);
+  event_count_++;
+}
+
+void EventRateCounter::AddEvents(EventRateCounter other) {
+  first_time_ = std::min(first_time_, other.first_time_);
+  last_time_ = std::max(last_time_, other.last_time_);
+  event_count_ += other.event_count_;
+  interval_.AddSamples(other.interval_);
+}
+
+bool EventRateCounter::IsEmpty() const {
+  return first_time_ == last_time_;
+}
+
+double EventRateCounter::Rate() const {
+  if (event_count_ == 0)
+    return 0;
+  if (event_count_ == 1)
+    return NAN;
+  return (event_count_ - 1) / (last_time_ - first_time_).seconds<double>();
+}
+
+TimeDelta EventRateCounter::TotalDuration() const {
+  if (first_time_.IsInfinite()) {
+    return TimeDelta::Zero();
+  }
+  return last_time_ - first_time_;
+}
+}  // namespace webrtc