omsbuff_new.c

linux下的rtp的实例源代码

/* * 
 *  $Id: OMSbuff_new.c 327 2006-03-28 16:14:41Z shawill $
 *  
 *  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 <stdlib.h>

#include <fenice/bufferpool.h>

#define OMSNEWBUFF_ERR	{ \
							free(slots); \
							free(buffer); \
							free(control); \
							return NULL; \
						}
OMSBuffer *OMSbuff_new(uint32 buffer_size)
{
	OMSSlot *slots = NULL;
	OMSBuffer *buffer = NULL;
	OMSControl *control = NULL;
	uint32 index;
	pthread_mutexattr_t mutex_attr;
	
	if (!buffer_size) return NULL;
	
	if(!(slots = (OMSSlot *)calloc(buffer_size, sizeof(OMSSlot))))
		OMSNEWBUFF_ERR
	// *** slots initialization
	for(index=0; index<buffer_size-1; index++)
		(slots[index]).next = index+1;
	(slots[index]).next = 0; /*end of the list back to the head*/
	
	 // control struct allocation
	if ( !(control=malloc(sizeof(OMSControl))) )
		OMSNEWBUFF_ERR

	control->write_pos = buffer_size-1;
	control->valid_read_pos = 0; // buffer_size-1;

	control->refs = 0;
	control->nslots = buffer_size;
	 
	if ( pthread_mutexattr_init(&mutex_attr) )
		OMSNEWBUFF_ERR
	if ( pthread_mutex_init(&control->syn, &mutex_attr) )
		OMSNEWBUFF_ERR
	
	if ( !(buffer = (OMSBuffer *)malloc(sizeof(OMSBuffer))) )
		OMSNEWBUFF_ERR

	buffer->type = buff_local;
	*buffer->filename = '\0';
	// buffer->fd = -1;
	// buffer->fd = NULL;
	buffer->known_slots = buffer_size;
		
	// link all allocated structs
	buffer->slots = slots;
	buffer->control = control;

	return buffer;
}
#undef OMSNEWBUFF_ERR