b90a64a449
Merge OveruseDetector into the TrendlineEstimator (send side BWE only) and remove the OveruseDetector from DelayBasedBwe. The behavior should be the same as before. One expection is that if no packets were received for kStreamTimeOutMs (2 seconds), it would previously reset the trendline estimator but not the detector. Since they have been merged, it now resets both. Create an interface that the estimators will implement to facilitate experimentation with different estimators/detectors. Bug: webrtc:8729 Change-Id: I5c3d2161a0d0dcb2e8a140c0fd887f0286d70fd4 Reviewed-on: https://webrtc-review.googlesource.com/38781 Reviewed-by: Sebastian Jansson <srte@webrtc.org> Commit-Queue: Björn Terelius <terelius@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21852}
93 lines
3.2 KiB
C++
93 lines
3.2 KiB
C++
/*
|
|
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
#ifndef MODULES_CONGESTION_CONTROLLER_TRENDLINE_ESTIMATOR_H_
|
|
#define MODULES_CONGESTION_CONTROLLER_TRENDLINE_ESTIMATOR_H_
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include <deque>
|
|
#include <utility>
|
|
|
|
#include "modules/congestion_controller/delay_increase_detector_interface.h"
|
|
#include "rtc_base/constructormagic.h"
|
|
|
|
namespace webrtc {
|
|
|
|
class TrendlineEstimator : public DelayIncreaseDetectorInterface {
|
|
public:
|
|
// |window_size| is the number of points required to compute a trend line.
|
|
// |smoothing_coef| controls how much we smooth out the delay before fitting
|
|
// the trend line. |threshold_gain| is used to scale the trendline slope for
|
|
// comparison to the old threshold. Once the old estimator has been removed
|
|
// (or the thresholds been merged into the estimators), we can just set the
|
|
// threshold instead of setting a gain.
|
|
TrendlineEstimator(size_t window_size,
|
|
double smoothing_coef,
|
|
double threshold_gain);
|
|
|
|
~TrendlineEstimator() override;
|
|
|
|
// Update the estimator with a new sample. The deltas should represent deltas
|
|
// between timestamp groups as defined by the InterArrival class.
|
|
void Update(double recv_delta_ms,
|
|
double send_delta_ms,
|
|
int64_t arrival_time_ms) override;
|
|
|
|
BandwidthUsage State() const override;
|
|
|
|
// Returns the estimated trend k multiplied by some gain.
|
|
// 0 < k < 1 -> the delay increases, queues are filling up
|
|
// k == 0 -> the delay does not change
|
|
// k < 0 -> the delay decreases, queues are being emptied
|
|
double trendline_slope() const { return trendline_ * threshold_gain_; }
|
|
|
|
// Returns the number of deltas which the current estimator state is based on.
|
|
unsigned int num_of_deltas() const { return num_of_deltas_; }
|
|
|
|
private:
|
|
void Detect(double offset,
|
|
double ts_delta,
|
|
int num_of_deltas,
|
|
int64_t now_ms);
|
|
|
|
void UpdateThreshold(double modified_offset, int64_t now_ms);
|
|
|
|
// Parameters.
|
|
const size_t window_size_;
|
|
const double smoothing_coef_;
|
|
const double threshold_gain_;
|
|
// Used by the existing threshold.
|
|
unsigned int num_of_deltas_;
|
|
// Keep the arrival times small by using the change from the first packet.
|
|
int64_t first_arrival_time_ms_;
|
|
// Exponential backoff filtering.
|
|
double accumulated_delay_;
|
|
double smoothed_delay_;
|
|
// Linear least squares regression.
|
|
std::deque<std::pair<double, double>> delay_hist_;
|
|
double trendline_;
|
|
|
|
const double k_up_;
|
|
const double k_down_;
|
|
double overusing_time_threshold_;
|
|
double threshold_;
|
|
int64_t last_update_ms_;
|
|
double prev_offset_;
|
|
double time_over_using_;
|
|
int overuse_counter_;
|
|
BandwidthUsage hypothesis_;
|
|
|
|
RTC_DISALLOW_COPY_AND_ASSIGN(TrendlineEstimator);
|
|
};
|
|
} // namespace webrtc
|
|
|
|
#endif // MODULES_CONGESTION_CONTROLLER_TRENDLINE_ESTIMATOR_H_
|