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 #ifndef MODULES_CONGESTION_CONTROLLER_PCC_BITRATE_CONTROLLER_H_ 12 #define MODULES_CONGESTION_CONTROLLER_PCC_BITRATE_CONTROLLER_H_ 13 14 #include <stdint.h> 15 16 #include <memory> 17 #include <vector> 18 19 #include "absl/types/optional.h" 20 #include "api/units/data_rate.h" 21 #include "modules/congestion_controller/pcc/monitor_interval.h" 22 #include "modules/congestion_controller/pcc/utility_function.h" 23 24 namespace webrtc { 25 namespace pcc { 26 27 class PccBitrateController { 28 public: 29 PccBitrateController(double initial_conversion_factor, 30 double initial_dynamic_boundary, 31 double dynamic_boundary_increment, 32 double rtt_gradient_coefficient, 33 double loss_coefficient, 34 double throughput_coefficient, 35 double throughput_power, 36 double rtt_gradient_threshold, 37 double delay_gradient_negative_bound); 38 39 PccBitrateController( 40 double initial_conversion_factor, 41 double initial_dynamic_boundary, 42 double dynamic_boundary_increment, 43 std::unique_ptr<PccUtilityFunctionInterface> utility_function); 44 45 absl::optional<DataRate> ComputeRateUpdateForSlowStartMode( 46 const PccMonitorInterval& monitor_interval); 47 48 DataRate ComputeRateUpdateForOnlineLearningMode( 49 const std::vector<PccMonitorInterval>& block, 50 DataRate bandwidth_estimate); 51 52 ~PccBitrateController(); 53 54 private: 55 double ApplyDynamicBoundary(double rate_change, double bitrate); 56 double ComputeStepSize(double utility_gradient); 57 58 // Dynamic boundary variables: 59 int64_t consecutive_boundary_adjustments_number_; 60 const double initial_dynamic_boundary_; 61 const double dynamic_boundary_increment_; 62 63 const std::unique_ptr<PccUtilityFunctionInterface> utility_function_; 64 // Step Size variables: 65 int64_t step_size_adjustments_number_; 66 const double initial_conversion_factor_; 67 68 absl::optional<double> previous_utility_; 69 }; 70 71 } // namespace pcc 72 } // namespace webrtc 73 74 #endif // MODULES_CONGESTION_CONTROLLER_PCC_BITRATE_CONTROLLER_H_ 75