Solved

Points for havman56

Posted on 2002-06-06
7
271 Views
Last Modified: 2010-04-02
http://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.



0
Comment
Question by:thienpnguyen
  • 6
7 Comments
 
LVL 4

Accepted Solution

by:
havman56 earned 200 total points
ID: 7059600
Thienpnguyen

nice to get a question pointed on me.

sure i will do for u with pleasure. i dont have any code as of now.i ned to write it!

but i have coded for RTP before 1 year. i will recollect it and i will do the needful for me.

apart from this serah the web

there is a library available for RTP from lucent website.
u can use it !it works fine...

 


0
 
LVL 6

Author Comment

by:thienpnguyen
ID: 7059877
Thank for reply as soon as posible .

When you have the source code, please post it at here . I will make some "dummy" questions to give points to you .

Sincerely,
0
 
LVL 4

Expert Comment

by:havman56
ID: 7061105
sure

i will post it! when is finished writing RTP code
0
Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

 
LVL 4

Expert Comment

by:havman56
ID: 7066086
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...
0
 
LVL 4

Expert Comment

by:havman56
ID: 7066890
/*****************************************************************
      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;

     }
   
}

               
               




     




0
 
LVL 4

Expert Comment

by:havman56
ID: 7066893
still not completed.. yet to be solved ...


   typedef struct _RTP_PACKET
   {
       
       unsigned short int ts;               /* timestamp */
       unsigned short int transit;
        float jitter;
   } RTP_PACKET;
0
 
LVL 4

Expert Comment

by:havman56
ID: 7078134
post ur comments!!
i need ur input before proceeding...

0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When writing generic code, using template meta-programming techniques, it is sometimes useful to know if a type is convertible to another type. A good example of when this might be is if you are writing diagnostic instrumentation for code to generat…
This article shows you how to optimize memory allocations in C++ using placement new. Applicable especially to usecases dealing with creation of large number of objects. A brief on problem: Lets take example problem for simplicity: - I have a G…
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.

815 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now