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Initial commit - acarsdec-1.1, upstream vanilla version

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Tomas Suchan 2012-07-18 01:20:23 +02:00
commit 8223d9e9c8
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/*
* Copyright (c) 2007 by Thierry Leconte (F4DWV)
*
* $Id: main.c,v 1.5 2007/04/22 16:14:41 f4dwv Exp $
*
* This code is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License version 2
* published by the Free Software Foundation.
*
* 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include "version.h"
#include "acarsdec.h"
extern int optind, opterr;
extern char *optarg;
static void usage(void)
{
fprintf(stderr, "Usage: acarsdec [-LR][-s noport] -d alsapcmdevice | -f sndfile \n");
fprintf(stderr, " -f sndfile :\t\tdecode from file sndfile (ie: a .wav file)\n");
fprintf(stderr, " -d alsapcmdevice :\tdecode from soundcard input alsapcmdevice (ie: hw:0,0)\n");
fprintf(stderr, " [-LR] :\t\tdiseable left or right channel decoding of stereo signal\n");
fprintf(stderr, " [-s noport ] :\t\tact as an APRS local server, on port : noport\n");
fprintf(stderr, "Input could be mono or stereo but with 48Khz sampling frequency.\nIf stereo, acarsdec will demod the 2 channels independantly (if no L ou R options specified)\n\n");
exit(1);
}
void print_mesg(msg_t * msg)
{
time_t t;
struct tm *tmp;
char pos[128];
printf("ACARS mode: %c", msg->mode);
printf(" Aircraft reg: %s\n", msg->addr);
printf("Message label: %s", msg->label);
printf(" Block id: %d", (int) msg->bid);
printf(" Msg. no: %s\n", msg->no);
printf("Flight id: %s\n", msg->fid);
printf("Message content:-\n%s", msg->txt);
if (posconv(msg->txt, msg->label, pos)==0)
printf("\nAPRS : Addr:%s Fid:%s Lbl:%s pos:%s\n", msg->addr, msg->fid,msg->label,pos);
t = time(NULL);
tmp = gmtime(&t);
printf
("\n----------------------------------------------------------[%02d/%02d/%04d %02d:%02d]\n\n",
tmp->tm_mday, tmp->tm_mon + 1, tmp->tm_year + 1900,
tmp->tm_hour, tmp->tm_min);
}
int main(int argc, char **argv)
{
int c;
msg_t msgl, msgr;
unsigned char rl, rr;
int nbitl, nbitr;
int nrbitl, nrbitr;
int nbch=0;
int el=1,er=1;
short port=0;
while ((c = getopt(argc, argv, "d:f:RLs:")) != EOF) {
switch (c) {
case 'd':
nbch = initsample(optarg, 0);
break;
case 'f':
nbch = initsample(optarg, 1);
break;
case 'L':
el=0;
break;
case 'R':
er=0;
break;
case 's':
port=atoi(optarg);
break;
default:
usage();
exit(1);
}
}
if (nbch == 0) {
usage();
exit(1);
}
if(port)
if(init_serv(port)) {
exit(1);
}
/* main loop */
init_bits();
init_mesg();
nbitl = nbitr = 0;
nrbitl = nrbitr = 8;
do {
short sample[4096];
int ind, len;
len = getsample(sample, 4096);
if (len < 0)
break;
for (ind = 0; ind < len;) {
if(el) {
nbitl += getbit(sample[ind], &rl, 0);
if (nbitl >= nrbitl) {
nrbitl = getmesg(rl, &msgl, 0);
nbitl = 0;
if (nrbitl == 0) {
if(port)
send_mesg(&msgl);
else
print_mesg(&msgl);
nrbitl = 8;
}
}
}
ind++;
if (nbch >= 2) {
if(er) {
nbitr += getbit(sample[ind], &rr, 1);
if (nbitr >= nrbitr) {
nrbitr = getmesg(rr, &msgr, 1);
nbitr = 0;
if (nrbitr == 0) {
if(port)
send_mesg(&msgl);
else
print_mesg(&msgl);
nrbitr = 8;
}
}
}
ind++;
}
}
} while (1);
if(port)
end_serv();
endsample();
exit(0);
}