0bac07a89b
Reason for revert: Multiple definitions of TestEstimator Original issue's description: > Pass arrival time as an int64_t rather than a double to the MedianSlopeEstimator to avoid precision loss. > > Also clean up the unit test. > > BUG=webrtc:6892 > > Committed: https://crrev.com/ebcbcc3b2451f5c4fb07f7b37815bd54f364d057 > Cr-Commit-Position: refs/heads/master@{#15634} TBR=brandtr@webrtc.org,stefan@webrtc.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=webrtc:6892 Review-Url: https://codereview.webrtc.org/2572353003 Cr-Commit-Position: refs/heads/master@{#15635}
72 lines
2.6 KiB
C++
72 lines
2.6 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_MODULES_CONGESTION_CONTROLLER_MEDIAN_SLOPE_ESTIMATOR_H_
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#define WEBRTC_MODULES_CONGESTION_CONTROLLER_MEDIAN_SLOPE_ESTIMATOR_H_
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#include <list>
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#include <utility>
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#include <vector>
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#include "webrtc/base/analytics/percentile_filter.h"
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/common_types.h"
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namespace webrtc {
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class MedianSlopeEstimator {
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public:
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// |window_size| is the number of points required to compute a trend line.
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// |threshold_gain| is used to scale the trendline slope for comparison to
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// the old threshold. Once the old estimator has been removed (or the
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// thresholds been merged into the estimators), we can just set the
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// threshold instead of setting a gain.
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MedianSlopeEstimator(size_t window_size, double threshold_gain);
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~MedianSlopeEstimator();
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// Update the estimator with a new sample. The deltas should represent deltas
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// between timestamp groups as defined by the InterArrival class.
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void Update(double recv_delta_ms, double send_delta_ms, double now_ms);
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// Returns the estimated trend k multiplied by some gain.
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// 0 < k < 1 -> the delay increases, queues are filling up
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// k == 0 -> the delay does not change
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// k < 0 -> the delay decreases, queues are being emptied
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double trendline_slope() const { return trendline_ * threshold_gain_; }
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// Returns the number of deltas which the current estimator state is based on.
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unsigned int num_of_deltas() const { return num_of_deltas_; }
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private:
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struct DelayInfo {
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DelayInfo(double time, double delay, size_t slope_count)
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: time(time), delay(delay) {
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slopes.reserve(slope_count);
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}
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double time;
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double delay;
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std::vector<double> slopes;
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};
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// Parameters.
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const size_t window_size_;
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const double threshold_gain_;
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// Used by the existing threshold.
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unsigned int num_of_deltas_;
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// Theil-Sen robust line fitting
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double accumulated_delay_;
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std::list<DelayInfo> delay_hist_;
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PercentileFilter<double> median_filter_;
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double trendline_;
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RTC_DISALLOW_COPY_AND_ASSIGN(MedianSlopeEstimator);
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_CONGESTION_CONTROLLER_MEDIAN_SLOPE_ESTIMATOR_H_
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