| Anastasia Koloskova | ddbbf46 | 2018-08-21 16:12:31 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2018 The WebRTC project authors. All Rights Reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #include "modules/congestion_controller/pcc/utility_function.h" |
| 12 | |
| 13 | #include <algorithm> |
| 14 | #include <cmath> |
| 15 | #include <vector> |
| 16 | |
| 17 | namespace webrtc { |
| 18 | namespace pcc { |
| 19 | |
| 20 | VivaceUtilityFunction::VivaceUtilityFunction( |
| 21 | double delay_gradient_coefficient, |
| 22 | double loss_coefficient, |
| 23 | double throughput_coefficient, |
| 24 | double throughput_power, |
| 25 | double delay_gradient_threshold, |
| 26 | double delay_gradient_negative_bound) |
| 27 | : delay_gradient_coefficient_(delay_gradient_coefficient), |
| 28 | loss_coefficient_(loss_coefficient), |
| 29 | throughput_power_(throughput_power), |
| 30 | throughput_coefficient_(throughput_coefficient), |
| 31 | delay_gradient_threshold_(delay_gradient_threshold), |
| 32 | delay_gradient_negative_bound_(delay_gradient_negative_bound) { |
| 33 | RTC_DCHECK_GE(delay_gradient_negative_bound_, 0); |
| 34 | } |
| 35 | |
| 36 | double VivaceUtilityFunction::Compute( |
| 37 | const PccMonitorInterval& monitor_interval) const { |
| 38 | RTC_DCHECK(monitor_interval.IsFeedbackCollectionDone()); |
| 39 | double bitrate = monitor_interval.GetTargetSendingRate().bps(); |
| 40 | double loss_rate = monitor_interval.GetLossRate(); |
| 41 | double rtt_gradient = |
| 42 | monitor_interval.ComputeDelayGradient(delay_gradient_threshold_); |
| 43 | rtt_gradient = std::max(rtt_gradient, -delay_gradient_negative_bound_); |
| 44 | return (throughput_coefficient_ * std::pow(bitrate, throughput_power_)) - |
| 45 | (delay_gradient_coefficient_ * bitrate * rtt_gradient) - |
| 46 | (loss_coefficient_ * bitrate * loss_rate); |
| 47 | } |
| 48 | |
| 49 | VivaceUtilityFunction::~VivaceUtilityFunction() = default; |
| 50 | |
| 51 | ModifiedVivaceUtilityFunction::ModifiedVivaceUtilityFunction( |
| 52 | double delay_gradient_coefficient, |
| 53 | double loss_coefficient, |
| 54 | double throughput_coefficient, |
| 55 | double throughput_power, |
| 56 | double delay_gradient_threshold, |
| 57 | double delay_gradient_negative_bound) |
| 58 | : delay_gradient_coefficient_(delay_gradient_coefficient), |
| 59 | loss_coefficient_(loss_coefficient), |
| 60 | throughput_power_(throughput_power), |
| 61 | throughput_coefficient_(throughput_coefficient), |
| 62 | delay_gradient_threshold_(delay_gradient_threshold), |
| 63 | delay_gradient_negative_bound_(delay_gradient_negative_bound) { |
| 64 | RTC_DCHECK_GE(delay_gradient_negative_bound_, 0); |
| 65 | } |
| 66 | |
| 67 | double ModifiedVivaceUtilityFunction::Compute( |
| 68 | const PccMonitorInterval& monitor_interval) const { |
| 69 | RTC_DCHECK(monitor_interval.IsFeedbackCollectionDone()); |
| 70 | double bitrate = monitor_interval.GetTargetSendingRate().bps(); |
| 71 | double loss_rate = monitor_interval.GetLossRate(); |
| 72 | double rtt_gradient = |
| 73 | monitor_interval.ComputeDelayGradient(delay_gradient_threshold_); |
| 74 | rtt_gradient = std::max(rtt_gradient, -delay_gradient_negative_bound_); |
| 75 | return (throughput_coefficient_ * std::pow(bitrate, throughput_power_) * |
| 76 | bitrate) - |
| 77 | (delay_gradient_coefficient_ * bitrate * bitrate * rtt_gradient) - |
| 78 | (loss_coefficient_ * bitrate * bitrate * loss_rate); |
| 79 | } |
| 80 | |
| 81 | ModifiedVivaceUtilityFunction::~ModifiedVivaceUtilityFunction() = default; |
| 82 | |
| 83 | } // namespace pcc |
| 84 | } // namespace webrtc |