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/*
* 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>
#include <cmath>
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
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