common_utils.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 <unistd.h>
#include <fcntl.h>

#include <fenice/types.h>
#include <fenice/utils.h>/*TODO: return ERR_X */
#include <fenice/mediainfo.h>

int next_start_code(uint8 *buf, uint32 *buf_size,int fin) {  			
	char buf_aux[3];                                               	
	int i;
	unsigned int count=0;
	if ( read(fin,&buf_aux,3) <3) {                                			/* If there aren't 3 more bytes we are at EOF */
		return -1;
	}
	while ( !((buf_aux[0] == 0x00) && (buf_aux[1]==0x00) && (buf_aux[2]==0x01))) {
    		buf[*buf_size]=buf_aux[0];
    		*buf_size+=1;
		buf_aux[0]=buf_aux[1];
		buf_aux[1]=buf_aux[2];
      		if ( read(fin,&buf_aux[2],1) < 1) {
			return -1;
        	}
      		count++;
    	}
    	for (i=0;i<3;i++) {
    		buf[*buf_size]=buf_aux[i];
    		*buf_size+=1;
    	}
     	return count;
}

uint32 random_access(media_entry *me){
	return me->description.bitrate/8 * me->play_offset/1000;
} 

int changePacketLength(float offset, media_entry *me){
	(me->description).pkt_len = offset;
	return 1;
}