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Posted on 2002-06-06
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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.



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Question by:thienpnguyen
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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...

 


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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,
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by:havman56
ID: 7061105
sure

i will post it! when is finished writing RTP code
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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...
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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;

     }
   
}

               
               




     




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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;
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Expert Comment

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

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