59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
/*
|
|
* Copyright (c) 2018 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_SAMPLE_COUNTER_H_
|
|
#define RTC_BASE_NUMERICS_SAMPLE_COUNTER_H_
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "absl/types/optional.h"
|
|
|
|
namespace rtc {
|
|
|
|
// Simple utility class for counting basic statistics (max./avg./variance) on
|
|
// stream of samples.
|
|
class SampleCounter {
|
|
public:
|
|
SampleCounter();
|
|
~SampleCounter();
|
|
void Add(int sample);
|
|
absl::optional<int> Avg(int64_t min_required_samples) const;
|
|
absl::optional<int> Max() const;
|
|
absl::optional<int64_t> Sum(int64_t min_required_samples) const;
|
|
int64_t NumSamples() const;
|
|
void Reset();
|
|
// Adds all the samples from the |other| SampleCounter as if they were all
|
|
// individually added using |Add(int)| method.
|
|
void Add(const SampleCounter& other);
|
|
|
|
protected:
|
|
int64_t sum_ = 0;
|
|
int64_t num_samples_ = 0;
|
|
absl::optional<int> max_;
|
|
};
|
|
|
|
class SampleCounterWithVariance : public SampleCounter {
|
|
public:
|
|
SampleCounterWithVariance();
|
|
~SampleCounterWithVariance();
|
|
void Add(int sample);
|
|
absl::optional<int64_t> Variance(int64_t min_required_samples) const;
|
|
void Reset();
|
|
// Adds all the samples from the |other| SampleCounter as if they were all
|
|
// individually added using |Add(int)| method.
|
|
void Add(const SampleCounterWithVariance& other);
|
|
|
|
private:
|
|
int64_t sum_squared_ = 0;
|
|
};
|
|
|
|
} // namespace rtc
|
|
#endif // RTC_BASE_NUMERICS_SAMPLE_COUNTER_H_
|