45 lines
1.8 KiB
C++
45 lines
1.8 KiB
C++
/*
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* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_NUMERICS_EVENT_RATE_COUNTER_H_
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#define RTC_BASE_NUMERICS_EVENT_RATE_COUNTER_H_
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#include "rtc_base/numerics/sample_stats.h"
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namespace webrtc {
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// Calculates statistics based on events. For example for computing frame rates.
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// Note that it doesn't provide any running statistics or reset funcitonality,
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// so it's mostly useful for end of call statistics.
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class EventRateCounter {
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public:
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// Adds an event based on it's |event_time| for correct updates of the
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// interval statistics, each event must be added past the previous events.
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void AddEvent(Timestamp event_time);
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// Adds the events from |other|. Note that the interval stats won't be
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// recalculated, only merged, so this is not equivalent to if the events would
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// have been added to the same counter from the start.
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void AddEvents(EventRateCounter other);
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bool IsEmpty() const;
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// Average number of events per second. Defaults to 0 for no events and NAN
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// for one event.
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double Rate() const;
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SampleStats<TimeDelta>& interval() { return interval_; }
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TimeDelta TotalDuration() const;
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int Count() const { return event_count_; }
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private:
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Timestamp first_time_ = Timestamp::PlusInfinity();
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Timestamp last_time_ = Timestamp::MinusInfinity();
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int64_t event_count_ = 0;
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SampleStats<TimeDelta> interval_;
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};
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} // namespace webrtc
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#endif // RTC_BASE_NUMERICS_EVENT_RATE_COUNTER_H_
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