omsbuff_write.c

linuxUNIX下跑的一套服务端程序

/* * 
 *  $Id: OMSbuff_write.c 133 2005-05-09 17:35:14Z federico $
 *  
 *  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 <string.h>
#include <fenice/utils.h>
#include <fenice/bufferpool.h>

/*! \brief Write a new slot in the buffer using the input parameters.
 *  
 *  The function writes a new slot according with input parameters. If the
 *  <tt>data</tt> belongs to a slot that was prevoiusly requested with
 *  <tt>OMSbuff_getslot</tt> then there is not the copy of data, just the
 *  parameter setting like a commit of changes done.
 *  \return ERR_NOERROR or ERR_ALLOC
 *  */
int32 OMSbuff_write(OMSBuffer *buffer, uint32 timestamp, uint8 marker, uint8 *data, uint32 data_size)
{
	OMSSlot *slot=buffer->write_pos;
	uint64 curr_seq = slot->slot_seq;
	
	if (slot->next->data == data) {
		slot = slot->next;
	} else {
		if (slot->next->refs > 0) {
			if ((slot = OMSbuff_slotadd(buffer, slot)) == NULL)
				return ERR_ALLOC;
		} else 
			slot = slot->next;

		memcpy(slot->data,data,data_size);
	}

	slot->timestamp = timestamp;
	slot->marker = marker;
	slot->data_size=data_size;
	
	slot->refs = buffer->refs;
	slot->slot_seq = curr_seq + 1;
	
	buffer->write_pos = slot;

	return ERR_NOERROR;
}