45 lines
1.8 KiB
C
45 lines
1.8 KiB
C
|
/*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
#ifndef RTC_BASE_NUMERICS_EVENT_RATE_COUNTER_H_
|
||
|
|
#define RTC_BASE_NUMERICS_EVENT_RATE_COUNTER_H_
|
||
|
|
|
||
|
|
#include "rtc_base/numerics/sample_stats.h"
|
||
|
|
|
||
|
|
namespace webrtc {
|
||
|
|
|
||
|
|
// Calculates statistics based on events. For example for computing frame rates.
|
||
|
|
// Note that it doesn't provide any running statistics or reset funcitonality,
|
||
|
|
// so it's mostly useful for end of call statistics.
|
||
|
|
class EventRateCounter {
|
||
|
|
public:
|
||
|
|
// Adds an event based on it's |event_time| for correct updates of the
|
||
|
|
// interval statistics, each event must be added past the previous events.
|
||
|
|
void AddEvent(Timestamp event_time);
|
||
|
|
// Adds the events from |other|. Note that the interval stats won't be
|
||
|
|
// recalculated, only merged, so this is not equivalent to if the events would
|
||
|
|
// have been added to the same counter from the start.
|
||
|
|
void AddEvents(EventRateCounter other);
|
||
|
|
bool IsEmpty() const;
|
||
|
|
// Average number of events per second. Defaults to 0 for no events and NAN
|
||
|
|
// for one event.
|
||
|
|
double Rate() const;
|
||
|
|
SampleStats<TimeDelta>& interval() { return interval_; }
|
||
|
|
TimeDelta TotalDuration() const;
|
||
|
|
int Count() const { return event_count_; }
|
||
|
|
|
||
|
|
private:
|
||
|
|
Timestamp first_time_ = Timestamp::PlusInfinity();
|
||
|
|
Timestamp last_time_ = Timestamp::MinusInfinity();
|
||
|
|
int64_t event_count_ = 0;
|
||
|
|
SampleStats<TimeDelta> interval_;
|
||
|
|
};
|
||
|
|
} // namespace webrtc
|
||
|
|
#endif // RTC_BASE_NUMERICS_EVENT_RATE_COUNTER_H_
|