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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <stdint.h>
#include <utils/min_filter.h>
#include <climits>
namespace transport {
namespace protocol {
namespace rtc {
const double ALPHA_RTC = 0.125;
const uint32_t HISTORY_LEN = 20; // 4 sec
class RTCDataPath {
public:
RTCDataPath(uint32_t path_id);
public:
void insertRttSample(uint64_t rtt);
void insertOwdSample(int64_t owd);
void computeInterArrivalGap(uint32_t segment_number);
void receivedNack();
uint32_t getPathId();
uint64_t getMinRtt();
double getQueuingDealy();
double getInterArrivalGap();
double getJitter();
bool isActive();
bool pathToProducer();
uint64_t getLastPacketTS();
void clearRtt();
void roundEnd();
private:
uint32_t path_id_;
int64_t getMinOwd();
uint64_t min_rtt;
uint64_t prev_min_rtt;
int64_t min_owd;
int64_t prev_min_owd;
double avg_owd;
double queuing_delay;
double jitter_;
int64_t last_owd_;
uint32_t largest_recv_seq_;
uint64_t largest_recv_seq_time_;
double avg_inter_arrival_;
// flags to check if a path is active
// we considere a path active if it reaches a producer
//(not a cache) --aka we got at least one nack on this path--
// and if we receives packets
bool received_nacks_;
bool received_packets_;
uint8_t rounds_without_packets_; // if we don't get any packet
// for MAX_ROUNDS_WITHOUT_PKTS
// we consider the path inactive
uint64_t last_received_data_packet_; // timestamp for the last data received
// on this path
utils::MinFilter<uint64_t> RTT_history_;
utils::MinFilter<int64_t> OWD_history_;
};
} // namespace rtc
} // namespace protocol
} // end namespace transport
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