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/*
* 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 <optional>
namespace webrtc {
// Simple utility class for counting basic statistics (max./avg./variance) on
// stream of samples.
class SampleCounter {
public:
SampleCounter();
~SampleCounter();
void Add(int sample);
std::optional<int> Avg(int64_t min_required_samples) const;
std::optional<int> Max() const;
std::optional<int> Min() const;
std::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;
std::optional<int> max_;
std::optional<int> min_;
};
class SampleCounterWithVariance : public SampleCounter {
public:
SampleCounterWithVariance();
~SampleCounterWithVariance();
void Add(int sample);
std::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 webrtc
// Re-export symbols from the webrtc namespace for backwards compatibility.
// TODO(bugs.webrtc.org/4222596): Remove once all references are updated.
#ifdef WEBRTC_ALLOW_DEPRECATED_NAMESPACES
namespace rtc {
using ::webrtc::SampleCounter;
using ::webrtc::SampleCounterWithVariance;
} // namespace rtc
#endif // WEBRTC_ALLOW_DEPRECATED_NAMESPACES
#endif // RTC_BASE_NUMERICS_SAMPLE_COUNTER_H_
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