72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
/*
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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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#ifndef MODULES_CONGESTION_CONTROLLER_PCC_MONITOR_INTERVAL_H_
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#define MODULES_CONGESTION_CONTROLLER_PCC_MONITOR_INTERVAL_H_
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#include <vector>
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#include "api/transport/network_types.h"
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#include "api/units/data_rate.h"
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#include "api/units/data_size.h"
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#include "api/units/time_delta.h"
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#include "api/units/timestamp.h"
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namespace webrtc {
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namespace pcc {
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// PCC divides time into consecutive monitor intervals which are used to test
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// consequences for performance of sending at a certain rate.
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class PccMonitorInterval {
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public:
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PccMonitorInterval(DataRate target_sending_rate,
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Timestamp start_time,
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TimeDelta duration);
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~PccMonitorInterval();
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PccMonitorInterval(const PccMonitorInterval& other);
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void OnPacketsFeedback(const std::vector<PacketResult>& packets_results);
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// Returns true if got complete information about packets.
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// Notice, this only happens when received feedback about the first packet
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// which were sent after the end of the monitor interval. If such event
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// doesn't occur, we don't mind anyway and stay in the same state.
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bool IsFeedbackCollectionDone() const;
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Timestamp GetEndTime() const;
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double GetLossRate() const;
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// Estimates the gradient using linear regression on the 2-dimensional
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// dataset (sampled packets delay, time of sampling).
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double ComputeDelayGradient(double delay_gradient_threshold) const;
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DataRate GetTargetSendingRate() const;
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// How fast receiving side gets packets.
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DataRate GetTransmittedPacketsRate() const;
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private:
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struct ReceivedPacket {
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TimeDelta delay;
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Timestamp sent_time;
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};
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// Target bitrate used to generate and pace the outgoing packets.
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// Actually sent bitrate might not match the target exactly.
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DataRate target_sending_rate_;
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// Start time is not included into interval while end time is included.
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Timestamp start_time_;
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TimeDelta interval_duration_;
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// Vectors below updates while receiving feedback.
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std::vector<ReceivedPacket> received_packets_;
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std::vector<Timestamp> lost_packets_sent_time_;
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DataSize received_packets_size_;
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bool feedback_collection_done_;
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};
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} // namespace pcc
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} // namespace webrtc
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#endif // MODULES_CONGESTION_CONTROLLER_PCC_MONITOR_INTERVAL_H_
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