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Add --no-decode option.

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This disables most decoding of the contents of Mode S messages, aircraft tracking, and some output modes that depend on them.
It's intended for edge receivers that just forward to a central hub rather than processing data locally.
This commit is contained in:
Oliver Jowett 2014-09-22 23:56:49 +01:00
parent a82df07c0c
commit 5683001164
3 changed files with 40 additions and 2 deletions
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26
dump1090.c
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@ -434,6 +434,7 @@ void showHelp(void) {
"--debug <flags> Debug mode (verbose), see README for details\n"
"--quiet Disable output to stdout. Use for daemon applications\n"
"--ppm <error> Set receiver error in parts per million (default 0)\n"
"--no-decode Don't decode the message contents beyond the minimum necessary\n"
"--help Show this help\n"
"\n"
"Debug mode flags: d = Log frames decoded with errors\n"
@ -681,6 +682,8 @@ int main(int argc, char **argv) {
} else if (!strcmp(argv[j],"--interactive-rtl1090")) {
Modes.interactive = 1;
Modes.interactive_rtl1090 = 1;
} else if (!strcmp(argv[j],"--no-decode")) {
Modes.no_decode = 1;
} else {
fprintf(stderr,
"Unknown or not enough arguments for option '%s'.\n\n",
@ -690,6 +693,29 @@ int main(int argc, char **argv) {
}
}
// Handle --no-decode, which turns off various parts of decoding
// that are not useful for an "edge" dump1090 that purely forwards
// raw data to a central hub elsewhere.
if (Modes.no_decode) {
if (Modes.interactive) {
fprintf(stderr, "--no-decode and --interactive cannot be specified together.\n");
exit(1);
}
if (Modes.net_output_sbs_port != MODES_NET_OUTPUT_SBS_PORT) {
fprintf(stderr, "--no-decode and --net-sbs-port cannot be specified together.\n");
exit(1);
}
if (Modes.net_http_port != MODES_NET_HTTP_PORT) {
fprintf(stderr, "--no-decode and --net-http-port cannot be specified together.\n");
exit(1);
}
Modes.net_output_sbs_port = 0;
Modes.net_http_port = 0;
}
#ifdef _WIN32
// Try to comply with the Copyright license conditions for binary distribution
if (!Modes.quiet) {showCopyright();}

1
dump1090.h
View file

@ -317,6 +317,7 @@ struct { // Internal state
int metric; // Use metric units
int mlat; // Use Beast ascii format for raw data output, i.e. @...; iso *...;
int interactive_rtl1090; // flight table in interactive mode is formatted like RTL1090
int no_decode; // Disable decoding and aircraft tracking
// User details
double fUserLat; // Users receiver/antenna lat/lon needed for initial surface location

15
mode_s.c
View file

@ -911,6 +911,9 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
// of the data contents, so save time and give up now.
if ((Modes.check_crc) && (!mm->crcok)) { return;}
// If decoding is disabled, this is as far as we go.
if (Modes.no_decode) return;
// Fields for DF0, DF16
if (mm->msgtype == 0 || mm->msgtype == 16) {
if (msg[0] & 0x04) { // VS Bit
@ -1176,6 +1179,12 @@ void displayModesMessage(struct modesMessage *mm) {
if (mm->correctedbits != 0)
printf("No. of bit errors fixed: %d\n", mm->correctedbits);
if (Modes.no_decode) {
// Show DF type and address only; the rest is not decoded.
printf("DF %d; address: %06x\n", mm->msgtype, mm->addr);
return;
}
if (mm->msgtype == 0) { // DF 0
printf("DF 0: Short Air-Air Surveillance.\n");
printf(" VS : %s\n", (mm->msg[0] & 0x04) ? "Ground" : "Airborne");
@ -1900,8 +1909,10 @@ void detectModeS(uint16_t *m, uint32_t mlen) {
void useModesMessage(struct modesMessage *mm) {
if ((Modes.check_crc == 0) || (mm->crcok) || (mm->correctedbits)) { // not checking, ok or fixed
// Always track aircraft
interactiveReceiveData(mm);
// If we are decoding, track aircraft
if (!Modes.no_decode) {
interactiveReceiveData(mm);
}
// In non-interactive non-quiet mode, display messages on standard output
if (!Modes.interactive && !Modes.quiet) {