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