Making acarsdec work again. - acarsdec - an ACARS decoder
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---
(DIR) commit ceb8470d0ef87be8950b8be6dd222a485e6ce7cf
(DIR) parent 79279b1c9882cd7a42f4dff6e518b085c3607d7b
(HTM) Author: Christoph Lohmann <20h@r-36.net>
Date: Sat, 27 Oct 2012 00:46:01 +0200
Making acarsdec work again.
Diffstat:
acarsdec.h | 4 ++--
getmesg.c | 29 +++++++++++++++--------------
input.c | 40 ++++++++++++++++---------------
main.c | 37 +++++++++++++++----------------
4 files changed, 56 insertions(+), 54 deletions(-)
---
(DIR) diff --git a/acarsdec.h b/acarsdec.h
@@ -18,7 +18,7 @@ extern void resetbits(int ch);
extern int getbit(short in, unsigned char *outbits, int ch);
extern void init_mesg(void);
-extern int getmesg(unsigned char r, msg_t * msg, int ch);
+extern int getmesg(unsigned char r, msg_t *msg, int ch);
extern int init_serv(short port);
extern int send_mesg(msg_t *msg);
@@ -29,7 +29,7 @@ enum {
IN_FILE = 0,
IN_ALSA = 1,
IN_STDIN = 2,
-
+
OUT_NET = 0x01,
OUT_PRINT = 0x02,
OUT_PROTO = 0x04,
(DIR) diff --git a/getmesg.c b/getmesg.c
@@ -58,7 +58,7 @@ static void update_crc(unsigned short *crc, unsigned char ch)
}
}
-static int build_mesg(char *txt, int len, msg_t * msg)
+static int build_mesg(char *txt, int len, msg_t *msg)
{
int i, k;
char r;
@@ -66,18 +66,8 @@ static int build_mesg(char *txt, int len, msg_t * msg)
/* remove special chars */
for (i = 0; i < len; i++) {
r = txt[i];
- switch(r) {
- case 0x0d:
- r = 176;
- break;
- case 0x0a:
- r = 178;
- break;
- default:
- if (r < ' ')
- r = 0xa4;
- break;
- };
+ if (r < ' ' && r != 0x0d && r != 0x0a)
+ r = ' ';
txt[i] = r;
}
txt[i] = '\0';
@@ -127,12 +117,23 @@ void init_mesg(void)
mstat[0].state = mstat[1].state = HEADL;
}
-int getmesg(unsigned char r, msg_t * msg, int ch)
+void
+print_mstat(struct mstat_s *mstat)
+{
+ if(mstat->state > 0) {
+ fprintf(stderr, "mstat: state = %d; ind = %d; crc = %.4x\n",
+ mstat->state, mstat->ind, mstat->crc);
+ }
+}
+
+int getmesg(unsigned char r, msg_t *msg, int ch)
{
struct mstat_s *st;
st = &(mstat[ch]);
+ //print_mstat(st);
+
do {
switch (st->state) {
case HEADL:
(DIR) diff --git a/input.c b/input.c
@@ -33,21 +33,21 @@ static int initstdin(void)
{
SF_INFO infwav;
-/* open wav input file */
infwav.format = 0;
inwav = sf_open_fd(STDIN_FILENO, SFM_READ, &infwav, SF_TRUE);
if (inwav == NULL) {
fprintf(stderr, "could not open stdin\n");
- return (0);
+ return 0;
}
if (infwav.samplerate != 48000) {
fprintf(stderr,
"Bad Input File sample rate: %d. Must be 48000\n",
infwav.samplerate);
- return (0);
+ return 0;
}
- nbch=infwav.channels;
- return (infwav.channels);
+ nbch = infwav.channels;
+
+ return infwav.channels;
}
static SNDFILE *inwav;
@@ -55,21 +55,22 @@ static int initsnd(char *filename)
{
SF_INFO infwav;
-/* open wav input file */
+ /* open wav input file */
infwav.format = 0;
inwav = sf_open(filename, SFM_READ, &infwav);
if (inwav == NULL) {
fprintf(stderr, "could not open %s\n", filename);
- return (0);
+ return 0;
}
if (infwav.samplerate != 48000) {
fprintf(stderr,
"Bad Input File sample rate: %d. Must be 48000\n",
infwav.samplerate);
- return (0);
+ return 0;
}
- nbch=infwav.channels;
- return (infwav.channels);
+ nbch = infwav.channels;
+
+ return infwav.channels;
}
static snd_pcm_t *capture_handle;
@@ -117,20 +118,21 @@ static int initalsa(char *filename)
return 0;
}
- if ((err =
- snd_pcm_hw_params_set_rate(capture_handle, hw_params, 48000,
+ if ((err = snd_pcm_hw_params_set_rate(capture_handle, hw_params, 48000,
0)) < 0) {
fprintf(stderr, "cannot set sample rate (%s)\n",
snd_strerror(err));
return 0;
}
- for(nbch=2;nbch>0;nbch--) {
- if (snd_pcm_hw_params_set_channels(capture_handle, hw_params, nbch)==0)
+ for(nbch = 2; nbch > 0; nbch--) {
+ if (snd_pcm_hw_params_set_channels(capture_handle,
+ hw_params, nbch) == 0) {
break;
+ }
}
- if (nbch ==0) {
+ if (nbch == 0) {
fprintf(stderr, "cannot set number of channels\n");
return 0;
}
@@ -173,20 +175,20 @@ int getsample(short *sample, int nb)
switch(source) {
case IN_STDIN:
- r = sf_read_short(inwav, sample, nb);
+ r = sf_read_short(inwav, sample, nb / nbch);
break;
case IN_FILE:
- r = sf_read_short(inwav, sample, nb);
+ r = sf_read_short(inwav, sample, nb / nbch);
if (r == 0)
r = -1; /* this is the end */
break;
case IN_ALSA:
- r = snd_pcm_readi(capture_handle, sample, nb/nbch);
+ r = snd_pcm_readi(capture_handle, sample, nb / nbch);
if (r <= 0)
fprintf(stderr,
"cannot read from interface (%s)\n",
snd_strerror(r));
- r=r*nbch;
+ r = r * nbch;
break;
}
return r;
(DIR) diff --git a/main.c b/main.c
@@ -56,9 +56,9 @@ static void usage(void)
"input alsapcmdevice (ie: hw:0,0)\n");
fprintf(stderr, " -t :\t\t\tread from stdin.\n");
fprintf(stderr, " [-v] :\t\t\tbe verbose.\n");
- fprintf(stderr, " [-c] :\t\t\tcolorfull output.\n");
+ fprintf(stderr, " [-c] :\t\t\tcolorful output.\n");
fprintf(stderr, " [-p] :\t\t\toutput should be parseable protocol.\n");
- fprintf(stderr, " [-e] :\t\t\tdo debug?\n");
+ fprintf(stderr, " [-e] :\t\t\tturn on debugging\n");
fprintf(stderr, " [-LR] :\t\tdisable left or right channel "
"decoding of stereo signal\n");
fprintf(stderr, " [-s noport ] :\t\tact as an APRS local server, "
@@ -70,23 +70,23 @@ static void usage(void)
exit(1);
}
-void print_mesg(msg_t * msg, int colored, int messgnumb)
+void print_mesg(msg_t *msg, int colored, int messgnumb)
{
time_t t;
struct tm *tmp;
char pos[128];
if (colored) {
- printf("ACARS mode: %s%c%s", RED,msg->mode,NONE);
+ printf("ACARS mode: %s%c%s", RED, msg->mode, NONE);
printf(" Aircraft reg: %s%s%s\n", GREEN,msg->addr,NONE);
- printf("Message label: %s%s%s", CYAN,msg->label,NONE);
- printf(" Block id: %s%d%s", RED,(int) msg->bid,NONE);
- printf(" Msg. no: %s%s%s\n", BLUE,msg->no,NONE);
- printf("Flight id: %s%s%s\n", MAGENTA,msg->fid,NONE);
- printf("Message content:-\n%s%s%s", YELLOW,msg->txt,NONE);
+ printf("Message label: %s%s%s", CYAN, msg->label, NONE);
+ printf(" Block id: %s%d%s", RED, (int)msg->bid, NONE);
+ printf(" Msg. no: %s%s%s\n", BLUE, msg->no, NONE);
+ printf("Flight id: %s%s%s\n", MAGENTA, msg->fid, NONE);
+ printf("Message content:-\n%s%s%s", YELLOW, msg->txt, NONE);
if (posconv(msg->txt, msg->label, pos)==0) {
printf("\n%sAPRS : Addr:%s Fid:%s Lbl:%s pos:%s%s\n",
- RED,msg->addr, msg->fid, msg->label, pos,NONE);
+ RED, msg->addr, msg->fid, msg->label, pos, NONE);
}
} else {
printf("ACARS mode: %c", msg->mode);
@@ -114,7 +114,7 @@ void print_mesg(msg_t * msg, int colored, int messgnumb)
fflush(stdout);
}
-void print_proto(msg_t * msg)
+void print_proto(msg_t *msg)
{
time_t t;
struct tm *tmp;
@@ -129,7 +129,8 @@ void print_proto(msg_t * msg)
printf("MSGNO: %s\n", msg->no);
printf("FLIGHTID: %s\n", msg->fid);
printf("CONTENT: %s\n.\n", msg->txt);
- if (posconv(msg->txt, msg->label, pos)==0) {
+
+ if (posconv(msg->txt, msg->label, pos)==0) {
printf("APRS-ADDR: %s\n", msg->addr);
printf("APRS-FID: %s\n", msg->fid);
printf("APRS-LABEL: %s\n", msg->label);
@@ -162,10 +163,10 @@ int main(int argc, char **argv)
msg_t msg[2];
int nbit[2] = {0, 0};
int nrbit[2] = {8, 8};
- int nbch=0;
+ int nbch = 0;
int esel[2] = {1, 1};
- short port=0;
- int debug=0;
+ short port = 0;
+ int debug = 0;
int output = 0;
int i;
int colored = 0;
@@ -239,8 +240,6 @@ int main(int argc, char **argv)
int ind, len;
len = getsample(sample, 4096);
- if (debug)
- fprintf(stderr, "Got sample: %d\n", len);
if (len <= 0)
break;
@@ -248,10 +247,10 @@ int main(int argc, char **argv)
for (i = 0; i < nbch; i++, ind++) {
if (esel[i]) {
nbit[i] += getbit(sample[ind], &r[i],
- 0);
+ (i? 1 : 0));
if (nbit[i] >= nrbit[i]) {
nrbit[i] = getmesg(r[i],
- &msg[i], 0);
+ &msg[i], (i? 1 : 0));
nbit[i] = 0;
if (nrbit[i] == 0) {
do_output(output,