/*
 * Copyright (c) 2010-2019 Belledonne Communications SARL.
 *
 * This file is part of oRTP.
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
 */

/* this program shows how to receive streams in paralel using the SessionSet api 
	and two threads only. */

#include <ortp/ortp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <fcntl.h>

#ifndef _WIN32
#include <unistd.h>

#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#endif

int runcond=1;

void stophandler(int signum)
{
	runcond=0;
}

static char *help="usage: mrtprecv	file_prefix local_port number_of_streams \n"
		"Receives multiples rtp streams on local_port+2*k, k={0..number_of_streams}\n";

#define STREAMS_COUNT 1000

/* malloc'd in order to detect buffer overflows with efence */
static uint8_t* recvbuf=0;

int rtp2disk(RtpSession *session,uint32_t ts, int fd)
{
	int err,havemore=1;
	while (havemore){
		err=rtp_session_recv_with_ts(session,recvbuf,160,ts,&havemore);
		if (havemore) printf("warning: havemore=%i!\n",havemore);
		if (err>0){
			rtp_session_set_data(session,(void*)1);
			/* to indicate that (for the application) the stream has started, so we can start
			recording on disk */
		}
		if (session->user_data != NULL) {
			size_t ret = write(fd,recvbuf,err);
			assert( ret == err );
		}
	}
	return 0;
}


int main(int argc, char *argv[])
{
	RtpSession *session[STREAMS_COUNT];
	int i;
	int filefd[STREAMS_COUNT];
	int port;
	uint32_t user_ts=0;
	int channels;
	SessionSet *set;
	char *filename;
	
	if (argc<4){
		printf("%s",help);
		return -1;
	}
	
	channels=atoi(argv[3]);
	if (channels==0){
		printf("%s",help);
		return -1;
	}
	
	ortp_init();
	ortp_scheduler_init();
	
	port=atoi(argv[2]);
	recvbuf=ortp_malloc(160);
	
	for (i=0;i<channels;i++){

		session[i]=rtp_session_new(RTP_SESSION_RECVONLY);	
		rtp_session_set_scheduling_mode(session[i],1);
		rtp_session_set_blocking_mode(session[i],0);
		rtp_session_set_local_addr(session[i],"0.0.0.0",port,port+1);
		rtp_session_set_payload_type(session[i],0);
		rtp_session_enable_adaptive_jitter_compensation(session[i], TRUE);
		rtp_session_set_recv_buf_size(session[i],256);
		port+=2;
	}
		
	filename=ortp_malloc(strlen(argv[1])+15);
	for (i=0;i<channels;i++){
		sprintf(filename,"%s%4.4d.dat",argv[1],i);
		#ifndef _WIN32
		filefd[i]=open(filename,O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP);
		#else
		filefd[i]=open(filename,_O_BINARY | O_WRONLY | O_CREAT | O_TRUNC);
		#endif
		if (filefd[i]<0) ortp_error("Could not open %s for writing: %s",filename,strerror(errno));
	}
	signal(SIGINT,stophandler);
	/* create a set */
	set=session_set_new();
	while(runcond)
	{
		int k;
		
		for (k=0;k<channels;k++){
			/* add the session to the set */
			session_set_set(set,session[k]);
			//printf("session_set_set %d\n", k);
		}
		/* and then suspend the process by selecting() */
		k=session_set_select(set,NULL,NULL);
		if (k==0) printf("warning: session_set_select() is returning 0...\n");
		for (k=0;k<channels;k++){
			if (session_set_is_set(set,session[k])){
				rtp2disk(session[k],user_ts,filefd[k]);
				//printf("session_set_is_set %d\n", k);
			} else {
				//printf("warning: session %i is not set !\n",k);
			}
		}
		user_ts+=160;
	}
	printf("Exiting\n");
	for (i=0;i<channels;i++){
		close(filefd[i]);
		rtp_session_destroy(session[i]);
	}
	session_set_destroy(set);
	ortp_free(filename);
	ortp_exit();
	ortp_global_stats_display();
	ortp_free(recvbuf);
	return 0;
}
