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92ea95e34a
In https://webrtc-review.googlesource.com/c/src/+/1560 we moved WebRTC from src/webrtc to src/ (in order to preserve an healthy git history). This CL takes care of fixing header guards, #include paths, etc... NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true TBR=tommi@webrtc.org Bug: chromium:611808 Change-Id: Iea91618212bee0af16aa3f05071eab8f93706578 Reviewed-on: https://webrtc-review.googlesource.com/1561 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Henrik Kjellander <kjellander@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19846}
71 lines
2.6 KiB
C++
71 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 MODULES_CONGESTION_CONTROLLER_TRENDLINE_ESTIMATOR_H_
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#define MODULES_CONGESTION_CONTROLLER_TRENDLINE_ESTIMATOR_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <deque>
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#include <utility>
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#include "rtc_base/constructormagic.h"
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namespace webrtc {
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class TrendlineEstimator {
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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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// |smoothing_coef| controls how much we smooth out the delay before fitting
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// the trend line. |threshold_gain| is used to scale the trendline slope for
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// comparison to the old threshold. Once the old estimator has been removed
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// (or the 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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TrendlineEstimator(size_t window_size,
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double smoothing_coef,
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double threshold_gain);
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~TrendlineEstimator();
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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,
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double send_delta_ms,
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int64_t arrival_time_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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// Parameters.
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const size_t window_size_;
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const double smoothing_coef_;
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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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// Keep the arrival times small by using the change from the first packet.
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int64_t first_arrival_time_ms;
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// Exponential backoff filtering.
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double accumulated_delay_;
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double smoothed_delay_;
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// Linear least squares regression.
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std::deque<std::pair<double, double>> delay_hist_;
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double trendline_;
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RTC_DISALLOW_COPY_AND_ASSIGN(TrendlineEstimator);
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};
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} // namespace webrtc
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#endif // MODULES_CONGESTION_CONTROLLER_TRENDLINE_ESTIMATOR_H_
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