stream_change.c

linuxUNIX下跑的一套服务端程序

/* * 
 *  $Id: stream_change.c 32 2004-07-07 09:50:50Z 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 <fenice/rtp.h>
#include <fenice/utils.h>
#include <fenice/intnet.h>
#include <string.h>

int stream_change(RTP_session *changing_session, int value)
{
	if (value == 0) {
		return ERR_NOERROR;
	} else if (value == -1) {
		if (changing_session->MinimumReached != 1) {
			changing_session->MaximumReached = 0;
	        	if (strcmp(changing_session->current_media->description.encoding_name,"MPA")==0) return downgrade_MP3(changing_session);
        		if (strcmp(changing_session->current_media->description.encoding_name,"GSM")==0) return downgrade_GSM(changing_session);
        		if (strcmp(changing_session->current_media->description.encoding_name,"L16")==0) return downgrade_L16(changing_session);
		}
	} else if (value == 1) {
		if (changing_session->MaximumReached != 1) {
			changing_session->MinimumReached = 0;
	        	if (strcmp(changing_session->current_media->description.encoding_name,"MPA")==0) return upgrade_MP3(changing_session);
        		if (strcmp(changing_session->current_media->description.encoding_name,"GSM")==0) return upgrade_GSM(changing_session);
		}
	} else if (value == -2) {
		if (changing_session->MinimumReached != 1) {
			changing_session->MaximumReached = 0;
	        	if (strcmp(changing_session->current_media->description.encoding_name,"MPA")==0) return half_MP3(changing_session);
        		if (strcmp(changing_session->current_media->description.encoding_name,"GSM")==0) return half_GSM(changing_session);
        		if (strcmp(changing_session->current_media->description.encoding_name,"L16")==0) return half_L16(changing_session);
		}
	}
	return ERR_NOERROR;
}