A Discrete-Event Network Simulator
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delay-jitter-estimation.cc
Go to the documentation of this file.
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/*
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* Copyright (c) 2007 INRIA
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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* Authors: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
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*/
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#include "
delay-jitter-estimation.h
"
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#include "ns3/simulator.h"
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#include "ns3/string.h"
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#include "ns3/timestamp-tag.h"
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namespace
ns3
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{
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DelayJitterEstimation::DelayJitterEstimation
()
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{
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}
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void
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DelayJitterEstimation::PrepareTx
(
Ptr<const Packet>
packet)
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{
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TimestampTag
tag(
Simulator::Now
());
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packet->AddByteTag(tag);
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}
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void
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DelayJitterEstimation::RecordRx
(
Ptr<const Packet>
packet)
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{
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TimestampTag
tag;
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if
(!packet->FindFirstMatchingByteTag(tag))
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{
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return
;
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}
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// Variable names from
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// RFC 1889 Appendix A.8 ,p. 71,
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// RFC 3550 Appendix A.8, p. 94
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Time
r_ts = tag.
GetTimestamp
();
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Time
arrival =
Simulator::Now
();
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Time
transit = arrival - r_ts;
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Time
delta = transit -
m_transit
;
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m_transit
= transit;
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// floating jitter version
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// m_jitter += (Abs (delta) - m_jitter) / 16;
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// int variant
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m_jitter
+=
Abs
(delta) - ((
m_jitter
+ TimeStep(8)) / 16);
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}
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Time
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DelayJitterEstimation::GetLastDelay
()
const
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{
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return
m_transit
;
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}
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uint64_t
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DelayJitterEstimation::GetLastJitter
()
const
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{
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// floating jitter version
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// return m_jitter.GetTimeStep();
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// int variant
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return
(
m_jitter
/ 16).GetTimeStep();
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}
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}
// namespace ns3
ns3::DelayJitterEstimation::GetLastDelay
Time GetLastDelay() const
Get the Last Delay object.
Definition
delay-jitter-estimation.cc:56
ns3::DelayJitterEstimation::RecordRx
void RecordRx(Ptr< const Packet > packet)
Invoke this method to update the delay and jitter calculations After a call to this method,...
Definition
delay-jitter-estimation.cc:30
ns3::DelayJitterEstimation::DelayJitterEstimation
DelayJitterEstimation()
Definition
delay-jitter-estimation.cc:18
ns3::DelayJitterEstimation::GetLastJitter
uint64_t GetLastJitter() const
The jitter is calculated using the RFC 1889 (RTP) jitter definition.
Definition
delay-jitter-estimation.cc:62
ns3::DelayJitterEstimation::PrepareTx
static void PrepareTx(Ptr< const Packet > packet)
This method should be invoked once on each packet to record within the packet the tx time which is us...
Definition
delay-jitter-estimation.cc:23
ns3::DelayJitterEstimation::m_transit
Time m_transit
Relative transit time for the previous packet.
Definition
delay-jitter-estimation.h:71
ns3::DelayJitterEstimation::m_jitter
Time m_jitter
Jitter estimation.
Definition
delay-jitter-estimation.h:70
ns3::Ptr
Smart pointer class similar to boost::intrusive_ptr.
Definition
mpi-test-fixtures.h:37
ns3::Simulator::Now
static Time Now()
Return the current simulation virtual time.
Definition
simulator.cc:197
ns3::Time
Simulation virtual time values and global simulation resolution.
Definition
nstime.h:94
ns3::TimestampTag
Timestamp tag for associating a timestamp with a packet.
Definition
timestamp-tag.h:28
ns3::TimestampTag::GetTimestamp
Time GetTimestamp() const
Get the Timestamp object.
Definition
timestamp-tag.cc:68
delay-jitter-estimation.h
ns3::Abs
int64x64_t Abs(const int64x64_t &value)
Absolute value.
Definition
int64x64.h:203
ns3
Every class exported by the ns3 library is enclosed in the ns3 namespace.
src
network
helper
delay-jitter-estimation.cc
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1.11.0