67 lines
2 KiB
C++
67 lines
2 KiB
C++
/*
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* Copyright (c) 2018 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_SAMPLE_COUNTER_H_
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#define RTC_BASE_NUMERICS_SAMPLE_COUNTER_H_
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#include <stdint.h>
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#include <optional>
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namespace webrtc {
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// Simple utility class for counting basic statistics (max./avg./variance) on
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// stream of samples.
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class SampleCounter {
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public:
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SampleCounter();
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~SampleCounter();
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void Add(int sample);
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std::optional<int> Avg(int64_t min_required_samples) const;
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std::optional<int> Max() const;
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std::optional<int> Min() const;
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std::optional<int64_t> Sum(int64_t min_required_samples) const;
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int64_t NumSamples() const;
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void Reset();
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// Adds all the samples from the `other` SampleCounter as if they were all
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// individually added using `Add(int)` method.
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void Add(const SampleCounter& other);
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protected:
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int64_t sum_ = 0;
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int64_t num_samples_ = 0;
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std::optional<int> max_;
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std::optional<int> min_;
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};
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class SampleCounterWithVariance : public SampleCounter {
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public:
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SampleCounterWithVariance();
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~SampleCounterWithVariance();
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void Add(int sample);
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std::optional<int64_t> Variance(int64_t min_required_samples) const;
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void Reset();
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// Adds all the samples from the `other` SampleCounter as if they were all
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// individually added using `Add(int)` method.
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void Add(const SampleCounterWithVariance& other);
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private:
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int64_t sum_squared_ = 0;
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};
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} // namespace webrtc
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// Re-export symbols from the webrtc namespace for backwards compatibility.
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// TODO(bugs.webrtc.org/4222596): Remove once all references are updated.
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namespace rtc {
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using ::webrtc::SampleCounter;
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using ::webrtc::SampleCounterWithVariance;
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} // namespace rtc
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#endif // RTC_BASE_NUMERICS_SAMPLE_COUNTER_H_
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