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