mirror of
https://github.com/mollyim/webrtc.git
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bda5068fae
This reverts commit e6cefdf9c5.
Reason for revert: conflicts with reverting https://webrtc-review.googlesource.com/c/src/+/52980
Original change's description:
> Moved congestion controller to goog_cc folder.
>
> Bug: webrtc:8415
> Change-Id: I2070da0cacf1dbfc4b6a89285af3e68fd03497ab
> Reviewed-on: https://webrtc-review.googlesource.com/43841
> Commit-Queue: Sebastian Jansson <srte@webrtc.org>
> Reviewed-by: Björn Terelius <terelius@webrtc.org>
> Reviewed-by: Stefan Holmer <stefan@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#21928}
TBR=terelius@webrtc.org,stefan@webrtc.org,srte@webrtc.org
# Not skipping CQ checks because original CL landed > 1 day ago.
Bug: webrtc:8415
Change-Id: If8965e1e745e57694192b9ca2a69503c722658d9
Reviewed-on: https://webrtc-review.googlesource.com/53020
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22012}
92 lines
3.2 KiB
C++
92 lines
3.2 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 "modules/congestion_controller/delay_increase_detector_interface.h"
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#include "rtc_base/constructormagic.h"
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namespace webrtc {
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class TrendlineEstimator : public DelayIncreaseDetectorInterface {
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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() override;
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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) override;
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BandwidthUsage State() const override;
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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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void Detect(double offset,
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double ts_delta,
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int num_of_deltas,
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int64_t now_ms);
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void UpdateThreshold(double modified_offset, int64_t now_ms);
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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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const double k_up_;
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const double k_down_;
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double overusing_time_threshold_;
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double threshold_;
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int64_t last_update_ms_;
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double prev_offset_;
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double time_over_using_;
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int overuse_counter_;
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BandwidthUsage hypothesis_;
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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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