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/*
* Copyright (c) 2018 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_PCC_BITRATE_CONTROLLER_H_
#define MODULES_CONGESTION_CONTROLLER_PCC_BITRATE_CONTROLLER_H_
#include <stdint.h>
#include <memory>
#include <vector>
#include "absl/types/optional.h"
#include "api/units/data_rate.h"
#include "modules/congestion_controller/pcc/monitor_interval.h"
#include "modules/congestion_controller/pcc/utility_function.h"
namespace webrtc {
namespace pcc {
class PccBitrateController {
public:
PccBitrateController(double initial_conversion_factor,
double initial_dynamic_boundary,
double dynamic_boundary_increment,
double rtt_gradient_coefficient,
double loss_coefficient,
double throughput_coefficient,
double throughput_power,
double rtt_gradient_threshold,
double delay_gradient_negative_bound);
PccBitrateController(
double initial_conversion_factor,
double initial_dynamic_boundary,
double dynamic_boundary_increment,
std::unique_ptr<PccUtilityFunctionInterface> utility_function);
absl::optional<DataRate> ComputeRateUpdateForSlowStartMode(
const PccMonitorInterval& monitor_interval);
DataRate ComputeRateUpdateForOnlineLearningMode(
const std::vector<PccMonitorInterval>& block,
DataRate bandwidth_estimate);
~PccBitrateController();
private:
double ApplyDynamicBoundary(double rate_change, double bitrate);
double ComputeStepSize(double utility_gradient);
// Dynamic boundary variables:
int64_t consecutive_boundary_adjustments_number_;
const double initial_dynamic_boundary_;
const double dynamic_boundary_increment_;
const std::unique_ptr<PccUtilityFunctionInterface> utility_function_;
// Step Size variables:
int64_t step_size_adjustments_number_;
const double initial_conversion_factor_;
absl::optional<double> previous_utility_;
};
} // namespace pcc
} // namespace webrtc
#endif // MODULES_CONGESTION_CONTROLLER_PCC_BITRATE_CONTROLLER_H_
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