calculate_skip.c

linux下的rtp的实例源代码

/* * 
 *  $Id$
 *  
 *  This file is part of Fenice
 *
 *  Fenice -- Open Media Server
 *
 *  Copyright (C) 2004 by
 *  	
 *	- Giampaolo Mancini	<[e-mail]>
 *	- Francesco Varano	<[e-mail]>
 *	- Marco Penno		<[e-mail]>
 *	- Federico Ridolfo	<[e-mail]>
 *	- Eugenio Menegatti 	<[e-mail]>
 *	- Stefano Cau
 *	- Giuliano Emma
 *	- Stefano Oldrini
 * 
 *  Fenice is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  Fenice is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Fenice; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *  
 * */

#include <stdio.h>
#include <fenice/mediainfo.h>
int calculate_skip(int byte_value,double *skip,int peso)
  {
    int pos,i,resto=1;
    double  partial,potenza;
    int quoziente;
    int numero;
    int flag; 
    if (peso==0)
     {
      *skip+=byte_value;
      return 0;
     } 
    else
    {    
    pos=0; 
    partial=0.0;
    quoziente=byte_value/2;
    
    resto=byte_value%2;
    flag=0;
    numero=quoziente;
    potenza=1;
    while(quoziente!=0)
    {
      flag=1;
      if (resto!=0)
      {
        for(i=1;i<=pos+peso;i++)
          potenza=2*potenza;
      }	  
      partial+=(resto)*potenza;  
      quoziente=numero/2;
      resto=numero%2;
      numero=quoziente;
      pos++;
    }
    if (resto!=0)
      {
        for(i=1;i<=pos+peso;i++)
          potenza=2*potenza;
      }	  
    partial+=(resto)*potenza; 
     *skip+=partial;
     return 0;
    }
  }