blob: 60ec3ba4164853aa942a37d813938d7aa45cf43c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
/*
* 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_
|
