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0810a7c25a
Add base class NetworkPredictor and NetworkPredictorFactory in /api, make it possible to inject customized NetworkPredictor in PeerConnectionFactory level. The NetworkPredictor object will be pass down to GoogCCNetworkControl and DelayBasedBwe. Bug: webrtc:10492 Change-Id: Iceeadbe1c9388b11ce4ac01ee56554cb0bf64d04 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/130201 Commit-Queue: Ying Wang <yinwa@webrtc.org> Reviewed-by: Per Kjellander <perkj@webrtc.org> Reviewed-by: Stefan Holmer <stefan@webrtc.org> Reviewed-by: Sami Kalliomäki <sakal@webrtc.org> Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27543}
93 lines
3.3 KiB
C++
93 lines
3.3 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_GOOG_CC_TRENDLINE_ESTIMATOR_H_
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#define MODULES_CONGESTION_CONTROLLER_GOOG_CC_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 "api/network_state_predictor.h"
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#include "modules/congestion_controller/goog_cc/delay_increase_detector_interface.h"
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#include "modules/remote_bitrate_estimator/include/bwe_defines.h"
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#include "rtc_base/constructor_magic.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.|network_state_predictor| is used to
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// bettter predict network state.
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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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NetworkStatePredictor* network_state_predictor);
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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 send_time_ms,
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int64_t arrival_time_ms,
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bool calculated_deltas) override;
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BandwidthUsage State() const override;
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protected:
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// Used in unit tests.
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double modified_trend() const { return prev_trend_ * threshold_gain_; }
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private:
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friend class GoogCcStatePrinter;
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void Detect(double trend, double ts_delta, 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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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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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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double prev_modified_trend_;
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int64_t last_update_ms_;
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double prev_trend_;
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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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BandwidthUsage hypothesis_predicted_;
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NetworkStatePredictor* network_state_predictor_;
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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_GOOG_CC_TRENDLINE_ESTIMATOR_H_
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