87 lines
3.3 KiB
C++
87 lines
3.3 KiB
C++
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/*
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* Copyright (c) 2018 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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#include "modules/congestion_controller/pcc/utility_function.h"
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#include <algorithm>
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#include <cmath>
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#include "api/units/data_rate.h"
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#include "rtc_base/checks.h"
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namespace webrtc {
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namespace pcc {
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VivaceUtilityFunction::VivaceUtilityFunction(
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double delay_gradient_coefficient,
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double loss_coefficient,
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double throughput_coefficient,
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double throughput_power,
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double delay_gradient_threshold,
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double delay_gradient_negative_bound)
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: delay_gradient_coefficient_(delay_gradient_coefficient),
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loss_coefficient_(loss_coefficient),
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throughput_power_(throughput_power),
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throughput_coefficient_(throughput_coefficient),
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delay_gradient_threshold_(delay_gradient_threshold),
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delay_gradient_negative_bound_(delay_gradient_negative_bound) {
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RTC_DCHECK_GE(delay_gradient_negative_bound_, 0);
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}
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double VivaceUtilityFunction::Compute(
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const PccMonitorInterval& monitor_interval) const {
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RTC_DCHECK(monitor_interval.IsFeedbackCollectionDone());
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double bitrate = monitor_interval.GetTargetSendingRate().bps();
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double loss_rate = monitor_interval.GetLossRate();
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double rtt_gradient =
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monitor_interval.ComputeDelayGradient(delay_gradient_threshold_);
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rtt_gradient = std::max(rtt_gradient, -delay_gradient_negative_bound_);
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return (throughput_coefficient_ * std::pow(bitrate, throughput_power_)) -
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(delay_gradient_coefficient_ * bitrate * rtt_gradient) -
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(loss_coefficient_ * bitrate * loss_rate);
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}
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VivaceUtilityFunction::~VivaceUtilityFunction() = default;
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ModifiedVivaceUtilityFunction::ModifiedVivaceUtilityFunction(
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double delay_gradient_coefficient,
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double loss_coefficient,
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double throughput_coefficient,
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double throughput_power,
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double delay_gradient_threshold,
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double delay_gradient_negative_bound)
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: delay_gradient_coefficient_(delay_gradient_coefficient),
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loss_coefficient_(loss_coefficient),
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throughput_power_(throughput_power),
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throughput_coefficient_(throughput_coefficient),
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delay_gradient_threshold_(delay_gradient_threshold),
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delay_gradient_negative_bound_(delay_gradient_negative_bound) {
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RTC_DCHECK_GE(delay_gradient_negative_bound_, 0);
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}
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double ModifiedVivaceUtilityFunction::Compute(
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const PccMonitorInterval& monitor_interval) const {
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RTC_DCHECK(monitor_interval.IsFeedbackCollectionDone());
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double bitrate = monitor_interval.GetTargetSendingRate().bps();
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double loss_rate = monitor_interval.GetLossRate();
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double rtt_gradient =
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monitor_interval.ComputeDelayGradient(delay_gradient_threshold_);
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rtt_gradient = std::max(rtt_gradient, -delay_gradient_negative_bound_);
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return (throughput_coefficient_ * std::pow(bitrate, throughput_power_) *
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bitrate) -
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(delay_gradient_coefficient_ * bitrate * bitrate * rtt_gradient) -
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(loss_coefficient_ * bitrate * bitrate * loss_rate);
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}
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ModifiedVivaceUtilityFunction::~ModifiedVivaceUtilityFunction() = default;
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} // namespace pcc
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} // namespace webrtc
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