thienpnguyen
asked on
Points for havman56
https://www.experts-exchange.com/jsp/qManageQuestion.jsp?ta=cplusprog&qid=20284244
Hi havman56,
Thank for helping . I have a other 500 points-question for you . I need source code calculate the latency of array of rtp packets .
Note :
1. The array of packets can have some lost packets .
2. Maybe, that function needs more information . You can add information as parameters
Thank for reading.
Hi havman56,
Thank for helping . I have a other 500 points-question for you . I need source code calculate the latency of array of rtp packets .
Note :
1. The array of packets can have some lost packets .
2. Maybe, that function needs more information . You can add information as parameters
Thank for reading.
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
sure
i will post it! when is finished writing RTP code
i will post it! when is finished writing RTP code
thienpnguyen
i am working on it!
may be after 2 days i will post here!
This is to inform u that i have not forgoted ur queery...
i am working on it!
may be after 2 days i will post here!
This is to inform u that i have not forgoted ur queery...
/*************************
Author : Mangal Dass P
Date : 23rd may 2000
Description : This gives the inter arrival jitter of RTP packets
Description : An estimate of the statistical variance of the RTP data packet
interarrival time, measured in timestamp units and expressed as
an unsigned integer. The interarrival jitter J is defined to be
the mean deviation (smoothed absolute value) of the difference D
in packet spacing at the receiver compared to the sender for a
pair of packets. As shown in the equation below, this is
equivalent to the difference in the "relative transit time" for
the two packets; the relative transit time is the difference
between a packet's RTP timestamp and the receiver's clock at the
time of arrival, measured in the same units.
Environment : MS VCcompiler
Recommenadtion :
not tested needs more improvement. initial version without timing behaviour
Email : micro_mangal@yahoo.com
**************************
#include "rtp.h"
RTP_PACKET s[2],r[2];
int arrival=150;
main()
{
int transit;
int d;
int i;
/*
* Initialsiing the values of timestamp but the
* real time operation is not considered here purely
* aribitarly values in ms. the values may be wrong too.
*/
s[0].ts=100;
s[1].ts=150;
r[0].ts=125;
r[1].ts=175;
s[0].transit=0;
s[0].jitter=0;
/*
* assume there are 3 packets both in sender and reciver
*/
for(i=0;i<=2;i++)
{
/* arrival is defined as the time at which packet
* reaches the destination.
* reciver Time stamp is defined as the time at which
* clock of reciver places the value at the packet
*/
transit = arrival - r[i].ts;
/*
* d is teh delay between transit delay and the initial time stamp of the sender
*/
d= transit- s[i].transit;
/*
* for the next iteration ie fro next packet
*/
s[i+1].transit=transit;
/*
* jitter is calculated by using the formula here.
*/
s[i+1].jitter += (1./16.) * ((double)d - s[i].jitter);
arrival= arrival + d;
}
}
Author : Mangal Dass P
Date : 23rd may 2000
Description : This gives the inter arrival jitter of RTP packets
Description : An estimate of the statistical variance of the RTP data packet
interarrival time, measured in timestamp units and expressed as
an unsigned integer. The interarrival jitter J is defined to be
the mean deviation (smoothed absolute value) of the difference D
in packet spacing at the receiver compared to the sender for a
pair of packets. As shown in the equation below, this is
equivalent to the difference in the "relative transit time" for
the two packets; the relative transit time is the difference
between a packet's RTP timestamp and the receiver's clock at the
time of arrival, measured in the same units.
Environment : MS VCcompiler
Recommenadtion :
not tested needs more improvement. initial version without timing behaviour
Email : micro_mangal@yahoo.com
**************************
#include "rtp.h"
RTP_PACKET s[2],r[2];
int arrival=150;
main()
{
int transit;
int d;
int i;
/*
* Initialsiing the values of timestamp but the
* real time operation is not considered here purely
* aribitarly values in ms. the values may be wrong too.
*/
s[0].ts=100;
s[1].ts=150;
r[0].ts=125;
r[1].ts=175;
s[0].transit=0;
s[0].jitter=0;
/*
* assume there are 3 packets both in sender and reciver
*/
for(i=0;i<=2;i++)
{
/* arrival is defined as the time at which packet
* reaches the destination.
* reciver Time stamp is defined as the time at which
* clock of reciver places the value at the packet
*/
transit = arrival - r[i].ts;
/*
* d is teh delay between transit delay and the initial time stamp of the sender
*/
d= transit- s[i].transit;
/*
* for the next iteration ie fro next packet
*/
s[i+1].transit=transit;
/*
* jitter is calculated by using the formula here.
*/
s[i+1].jitter += (1./16.) * ((double)d - s[i].jitter);
arrival= arrival + d;
}
}
still not completed.. yet to be solved ...
typedef struct _RTP_PACKET
{
unsigned short int ts; /* timestamp */
unsigned short int transit;
float jitter;
} RTP_PACKET;
typedef struct _RTP_PACKET
{
unsigned short int ts; /* timestamp */
unsigned short int transit;
float jitter;
} RTP_PACKET;
post ur comments!!
i need ur input before proceeding...
i need ur input before proceeding...
ASKER
When you have the source code, please post it at here . I will make some "dummy" questions to give points to you .
Sincerely,