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/*
* Copyright (c) 2013 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_REMOTE_BITRATE_ESTIMATOR_OVERUSE_ESTIMATOR_H_
#define MODULES_REMOTE_BITRATE_ESTIMATOR_OVERUSE_ESTIMATOR_H_
#include <stdint.h>
#include <deque>
#include "api/network_state_predictor.h"
namespace webrtc {
class OveruseEstimator {
public:
OveruseEstimator();
OveruseEstimator(const OveruseEstimator&) = delete;
OveruseEstimator& operator=(const OveruseEstimator&) = delete;
~OveruseEstimator() = default;
// Update the estimator with a new sample. The deltas should represent deltas
// between timestamp groups as defined by the InterArrival class.
// `current_hypothesis` should be the hypothesis of the over-use detector at
// this time.
void Update(int64_t t_delta,
double ts_delta,
int size_delta,
BandwidthUsage current_hypothesis,
int64_t now_ms);
// Returns the estimated noise/jitter variance in ms^2.
double var_noise() const { return var_noise_; }
// Returns the estimated inter-arrival time delta offset in ms.
double offset() const { return offset_; }
// Returns the number of deltas which the current over-use estimator state is
// based on.
int num_of_deltas() const { return num_of_deltas_; }
private:
double UpdateMinFramePeriod(double ts_delta);
void UpdateNoiseEstimate(double residual, double ts_delta, bool stable_state);
int num_of_deltas_ = 0;
double slope_ = 8.0 / 512.0;
double offset_ = 0;
double prev_offset_ = 0;
double E_[2][2] = {{100.0, 0.0}, {0.0, 1e-1}};
double process_noise_[2] = {1e-13, 1e-3};
double avg_noise_ = 0.0;
double var_noise_ = 50.0;
std::deque<double> ts_delta_hist_;
};
} // namespace webrtc
#endif // MODULES_REMOTE_BITRATE_ESTIMATOR_OVERUSE_ESTIMATOR_H_
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