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/*
* Copyright (c) 2016 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 VIDEO_QUALITY_THRESHOLD_H_
#define VIDEO_QUALITY_THRESHOLD_H_
#include <memory>
#include "absl/types/optional.h"
namespace webrtc {
class QualityThreshold {
public:
// Both thresholds are inclusive, i.e. measurement >= high signifies a high
// state, while measurement <= low signifies a low state.
QualityThreshold(int low_threshold,
int high_threshold,
float fraction,
int max_measurements);
~QualityThreshold();
void AddMeasurement(int measurement);
absl::optional<bool> IsHigh() const;
absl::optional<double> CalculateVariance() const;
absl::optional<double> FractionHigh(int min_required_samples) const;
private:
const std::unique_ptr<int[]> buffer_;
const int max_measurements_;
const float fraction_;
const int low_threshold_;
const int high_threshold_;
int until_full_;
int next_index_;
absl::optional<bool> is_high_;
int sum_;
int count_low_;
int count_high_;
int num_high_states_;
int num_certain_states_;
};
} // namespace webrtc
#endif // VIDEO_QUALITY_THRESHOLD_H_
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