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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.
*/
#include "modules/congestion_controller/pcc/utility_function.h"
#include <algorithm>
#include <cmath>
#include "api/units/data_rate.h"
#include "rtc_base/checks.h"
namespace webrtc {
namespace pcc {
VivaceUtilityFunction::VivaceUtilityFunction(
double delay_gradient_coefficient,
double loss_coefficient,
double throughput_coefficient,
double throughput_power,
double delay_gradient_threshold,
double delay_gradient_negative_bound)
: delay_gradient_coefficient_(delay_gradient_coefficient),
loss_coefficient_(loss_coefficient),
throughput_power_(throughput_power),
throughput_coefficient_(throughput_coefficient),
delay_gradient_threshold_(delay_gradient_threshold),
delay_gradient_negative_bound_(delay_gradient_negative_bound) {
RTC_DCHECK_GE(delay_gradient_negative_bound_, 0);
}
double VivaceUtilityFunction::Compute(
const PccMonitorInterval& monitor_interval) const {
RTC_DCHECK(monitor_interval.IsFeedbackCollectionDone());
double bitrate = monitor_interval.GetTargetSendingRate().bps();
double loss_rate = monitor_interval.GetLossRate();
double rtt_gradient =
monitor_interval.ComputeDelayGradient(delay_gradient_threshold_);
rtt_gradient = std::max(rtt_gradient, -delay_gradient_negative_bound_);
return (throughput_coefficient_ * std::pow(bitrate, throughput_power_)) -
(delay_gradient_coefficient_ * bitrate * rtt_gradient) -
(loss_coefficient_ * bitrate * loss_rate);
}
VivaceUtilityFunction::~VivaceUtilityFunction() = default;
ModifiedVivaceUtilityFunction::ModifiedVivaceUtilityFunction(
double delay_gradient_coefficient,
double loss_coefficient,
double throughput_coefficient,
double throughput_power,
double delay_gradient_threshold,
double delay_gradient_negative_bound)
: delay_gradient_coefficient_(delay_gradient_coefficient),
loss_coefficient_(loss_coefficient),
throughput_power_(throughput_power),
throughput_coefficient_(throughput_coefficient),
delay_gradient_threshold_(delay_gradient_threshold),
delay_gradient_negative_bound_(delay_gradient_negative_bound) {
RTC_DCHECK_GE(delay_gradient_negative_bound_, 0);
}
double ModifiedVivaceUtilityFunction::Compute(
const PccMonitorInterval& monitor_interval) const {
RTC_DCHECK(monitor_interval.IsFeedbackCollectionDone());
double bitrate = monitor_interval.GetTargetSendingRate().bps();
double loss_rate = monitor_interval.GetLossRate();
double rtt_gradient =
monitor_interval.ComputeDelayGradient(delay_gradient_threshold_);
rtt_gradient = std::max(rtt_gradient, -delay_gradient_negative_bound_);
return (throughput_coefficient_ * std::pow(bitrate, throughput_power_) *
bitrate) -
(delay_gradient_coefficient_ * bitrate * bitrate * rtt_gradient) -
(loss_coefficient_ * bitrate * bitrate * loss_rate);
}
ModifiedVivaceUtilityFunction::~ModifiedVivaceUtilityFunction() = default;
} // namespace pcc
} // namespace webrtc