c20978e581
NOPRESUBMIT=True # cpplint errors that aren't caused by this CL. NOTRY=True NOTREECHECKS=True TBR=kwiberg@webrtc.org, kjellander@webrtc.org Bug: webrtc:7634 Change-Id: I3cca0fbaa807b563c95979cccd6d1bec32055f36 Reviewed-on: https://chromium-review.googlesource.com/562156 Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#18919}
53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
/*
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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 WEBRTC_VIDEO_QUALITY_THRESHOLD_H_
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#define WEBRTC_VIDEO_QUALITY_THRESHOLD_H_
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#include <memory>
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#include "webrtc/rtc_base/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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void AddMeasurement(int measurement);
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rtc::Optional<bool> IsHigh() const;
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rtc::Optional<double> CalculateVariance() const;
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rtc::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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rtc::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 // WEBRTC_VIDEO_QUALITY_THRESHOLD_H_
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