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dump1090/dump1090.c

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// Part of dump1090, a Mode S message decoder for RTLSDR devices.
//
// dump1090.c: main program & miscellany
//
// Copyright (c) 2014-2016 Oliver Jowett <oliver@mutability.co.uk>
//
// This file is free software: you may copy, redistribute 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.
//
// This file 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 file incorporates work covered by the following copyright and
// permission notice:
//
// Copyright (C) 2012 by Salvatore Sanfilippo <antirez@gmail.com>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "dump1090.h"
#include <stdarg.h>
//
// ============================= Utility functions ==========================
//
static void log_with_timestamp(const char *format, ...) __attribute__((format (printf, 1, 2) ));
static void log_with_timestamp(const char *format, ...)
{
char timebuf[128];
char msg[1024];
time_t now;
struct tm local;
va_list ap;
now = time(NULL);
localtime_r(&now, &local);
strftime(timebuf, 128, "%c %Z", &local);
timebuf[127] = 0;
va_start(ap, format);
vsnprintf(msg, 1024, format, ap);
va_end(ap);
msg[1023] = 0;
fprintf(stderr, "%s %s\n", timebuf, msg);
}
static void sigintHandler(int dummy) {
MODES_NOTUSED(dummy);
signal(SIGINT, SIG_DFL); // reset signal handler - bit extra safety
Modes.exit = 1; // Signal to threads that we are done
log_with_timestamp("Caught SIGINT, shutting down..\n");
}
static void sigtermHandler(int dummy) {
MODES_NOTUSED(dummy);
signal(SIGTERM, SIG_DFL); // reset signal handler - bit extra safety
Modes.exit = 1; // Signal to threads that we are done
log_with_timestamp("Caught SIGTERM, shutting down..\n");
}
void receiverPositionChanged(float lat, float lon, float alt)
{
log_with_timestamp("Autodetected receiver location: %.5f, %.5f at %.0fm AMSL", lat, lon, alt);
writeJsonToFile("receiver.json", generateReceiverJson); // location changed
}
//
// =============================== Initialization ===========================
//
void modesInitConfig(void) {
// Default everything to zero/NULL
memset(&Modes, 0, sizeof(Modes));
// Now initialise things that should not be 0/NULL to their defaults
Modes.gain = MODES_MAX_GAIN;
Modes.freq = MODES_DEFAULT_FREQ;
Modes.check_crc = 1;
Modes.net_heartbeat_interval = MODES_NET_HEARTBEAT_INTERVAL;
Modes.net_input_raw_ports = strdup("30001");
Modes.net_output_raw_ports = strdup("30002");
Modes.net_output_sbs_ports = strdup("30003");
Modes.net_input_beast_ports = strdup("30004,30104");
Modes.net_output_beast_ports = strdup("30005");
Modes.interactive_display_ttl = MODES_INTERACTIVE_DISPLAY_TTL;
Modes.json_interval = 1000;
Modes.json_location_accuracy = 1;
Modes.maxRange = 1852 * 300; // 300NM default max range
Modes.mode_ac_auto = 1;
sdrInitConfig();
}
//
//=========================================================================
//
void modesInit(void) {
int i;
pthread_mutex_init(&Modes.data_mutex,NULL);
pthread_cond_init(&Modes.data_cond,NULL);
Modes.sample_rate = 2400000.0;
// Allocate the various buffers used by Modes
Modes.trailing_samples = (MODES_PREAMBLE_US + MODES_LONG_MSG_BITS + 16) * 1e-6 * Modes.sample_rate;
if ( ((Modes.log10lut = (uint16_t *) malloc(sizeof(uint16_t) * 256 * 256) ) == NULL) )
{
fprintf(stderr, "Out of memory allocating data buffer.\n");
exit(1);
}
for (i = 0; i < MODES_MAG_BUFFERS; ++i) {
if ( (Modes.mag_buffers[i].data = calloc(MODES_MAG_BUF_SAMPLES+Modes.trailing_samples, sizeof(uint16_t))) == NULL ) {
fprintf(stderr, "Out of memory allocating magnitude buffer.\n");
exit(1);
}
Modes.mag_buffers[i].length = 0;
Modes.mag_buffers[i].dropped = 0;
Modes.mag_buffers[i].sampleTimestamp = 0;
}
// Validate the users Lat/Lon home location inputs
if ( (Modes.fUserLat > 90.0) // Latitude must be -90 to +90
|| (Modes.fUserLat < -90.0) // and
|| (Modes.fUserLon > 360.0) // Longitude must be -180 to +360
|| (Modes.fUserLon < -180.0) ) {
Modes.fUserLat = Modes.fUserLon = 0.0;
} else if (Modes.fUserLon > 180.0) { // If Longitude is +180 to +360, make it -180 to 0
Modes.fUserLon -= 360.0;
}
// If both Lat and Lon are 0.0 then the users location is either invalid/not-set, or (s)he's in the
// Atlantic ocean off the west coast of Africa. This is unlikely to be correct.
// Set the user LatLon valid flag only if either Lat or Lon are non zero. Note the Greenwich meridian
// is at 0.0 Lon,so we must check for either fLat or fLon being non zero not both.
// Testing the flag at runtime will be much quicker than ((fLon != 0.0) || (fLat != 0.0))
Modes.bUserFlags &= ~MODES_USER_LATLON_VALID;
if ((Modes.fUserLat != 0.0) || (Modes.fUserLon != 0.0)) {
Modes.bUserFlags |= MODES_USER_LATLON_VALID;
}
// Limit the maximum requested raw output size to less than one Ethernet Block
if (Modes.net_output_flush_size > (MODES_OUT_FLUSH_SIZE))
{Modes.net_output_flush_size = MODES_OUT_FLUSH_SIZE;}
if (Modes.net_output_flush_interval > (MODES_OUT_FLUSH_INTERVAL))
{Modes.net_output_flush_interval = MODES_OUT_FLUSH_INTERVAL;}
if (Modes.net_sndbuf_size > (MODES_NET_SNDBUF_MAX))
{Modes.net_sndbuf_size = MODES_NET_SNDBUF_MAX;}
// Prepare the log10 lookup table: 100log10(x)
Modes.log10lut[0] = 0; // poorly defined..
for (i = 1; i <= 65535; i++) {
Modes.log10lut[i] = (uint16_t) round(100.0 * log10(i));
}
// Prepare error correction tables
modesChecksumInit(Modes.nfix_crc);
icaoFilterInit();
modeACInit();
if (Modes.show_only)
icaoFilterAdd(Modes.show_only);
}
//
//=========================================================================
//
// We use a thread reading data in background, while the main thread
// handles decoding and visualization of data to the user.
//
// The reading thread calls the RTLSDR API to read data asynchronously, and
// uses a callback to populate the data buffer.
//
// A Mutex is used to avoid races with the decoding thread.
//
//
//=========================================================================
//
// We read data using a thread, so the main thread only handles decoding
// without caring about data acquisition
//
void *readerThreadEntryPoint(void *arg)
{
MODES_NOTUSED(arg);
sdrRun();
// Wake the main thread (if it's still waiting)
pthread_mutex_lock(&Modes.data_mutex);
if (!Modes.exit)
Modes.exit = 2; // unexpected exit
pthread_cond_signal(&Modes.data_cond);
pthread_mutex_unlock(&Modes.data_mutex);
return NULL;
}
//
// ============================== Snip mode =================================
//
// Get raw IQ samples and filter everything is < than the specified level
// for more than 256 samples in order to reduce example file size
//
void snipMode(int level) {
int i, q;
uint64_t c = 0;
while ((i = getchar()) != EOF && (q = getchar()) != EOF) {
if (abs(i-127) < level && abs(q-127) < level) {
c++;
if (c > MODES_PREAMBLE_SIZE) continue;
} else {
c = 0;
}
putchar(i);
putchar(q);
}
}
//
// ================================ Main ====================================
//
void showHelp(void) {
printf("-----------------------------------------------------------------------------\n");
printf("| dump1090 ModeS Receiver %45s |\n", MODES_DUMP1090_VARIANT " " MODES_DUMP1090_VERSION);
printf("| build options: %-58s |\n",
""
#ifdef ENABLE_RTLSDR
"ENABLE_RTLSDR "
#endif
#ifdef ENABLE_BLADERF
"ENABLE_BLADERF "
#endif
#ifdef SC16Q11_TABLE_BITS
// This is a little silly, but that's how the preprocessor works..
#define _stringize(x) #x
#define stringize(x) _stringize(x)
"SC16Q11_TABLE_BITS=" stringize(SC16Q11_TABLE_BITS)
#undef stringize
#undef _stringize
#endif
);
printf("-----------------------------------------------------------------------------\n");
printf("\n");
sdrShowHelp();
printf(
" Common options\n"
"\n"
"--gain <db> Set gain (default: max gain. Use -10 for auto-gain)\n"
"--freq <hz> Set frequency (default: 1090 Mhz)\n"
"--interactive Interactive mode refreshing data on screen. Implies --throttle\n"
"--interactive-ttl <sec> Remove from list if idle for <sec> (default: 60)\n"
"--raw Show only messages hex values\n"
"--net Enable networking\n"
"--modeac Enable decoding of SSR Modes 3/A & 3/C\n"
"--no-modeac-auto Don't enable Mode A/C if requested by a Beast connection\n"
"--net-only Enable just networking, no RTL device or file used\n"
"--net-bind-address <ip> IP address to bind to (default: Any; Use 127.0.0.1 for private)\n"
"--net-ri-port <ports> TCP raw input listen ports (default: 30001)\n"
"--net-ro-port <ports> TCP raw output listen ports (default: 30002)\n"
"--net-sbs-port <ports> TCP BaseStation output listen ports (default: 30003)\n"
"--net-bi-port <ports> TCP Beast input listen ports (default: 30004,30104)\n"
"--net-bo-port <ports> TCP Beast output listen ports (default: 30005)\n"
"--net-ro-size <size> TCP output minimum size (default: 0)\n"
"--net-ro-interval <rate> TCP output memory flush rate in seconds (default: 0)\n"
"--net-heartbeat <rate> TCP heartbeat rate in seconds (default: 60 sec; 0 to disable)\n"
"--net-buffer <n> TCP buffer size 64Kb * (2^n) (default: n=0, 64Kb)\n"
"--net-verbatim Do not apply CRC corrections to messages we forward; send unchanged\n"
"--forward-mlat Allow forwarding of received mlat results to output ports\n"
"--lat <latitude> Reference/receiver latitude for surface posn (opt)\n"
"--lon <longitude> Reference/receiver longitude for surface posn (opt)\n"
"--max-range <distance> Absolute maximum range for position decoding (in nm, default: 300)\n"
"--fix Enable single-bits error correction using CRC\n"
"--no-fix Disable single-bits error correction using CRC\n"
"--no-crc-check Disable messages with broken CRC (discouraged)\n"
#ifdef ALLOW_AGGRESSIVE
"--aggressive More CPU for more messages (two bits fixes, ...)\n"
#endif
"--mlat display raw messages in Beast ascii mode\n"
"--stats With --ifile print stats at exit. No other output\n"
"--stats-range Collect/show range histogram\n"
"--stats-every <seconds> Show and reset stats every <seconds> seconds\n"
"--onlyaddr Show only ICAO addresses (testing purposes)\n"
"--metric Use metric units (meters, km/h, ...)\n"
"--gnss Show altitudes as HAE/GNSS (with H suffix) when available\n"
"--snip <level> Strip IQ file removing samples < level\n"
"--debug <flags> Debug mode (verbose), see README for details\n"
"--quiet Disable output to stdout. Use for daemon applications\n"
"--show-only <addr> Show only messages from the given ICAO on stdout\n"
"--write-json <dir> Periodically write json output to <dir> (for serving by a separate webserver)\n"
"--write-json-every <t> Write json output every t seconds (default 1)\n"
"--json-location-accuracy <n> Accuracy of receiver location in json metadata: 0=no location, 1=approximate, 2=exact\n"
"--dcfilter Apply a 1Hz DC filter to input data (requires more CPU)\n"
"--help Show this help\n"
"\n"
"Debug mode flags: d = Log frames decoded with errors\n"
" D = Log frames decoded with zero errors\n"
" c = Log frames with bad CRC\n"
" C = Log frames with good CRC\n"
" p = Log frames with bad preamble\n"
" n = Log network debugging info\n"
" j = Log frames to frames.js, loadable by debug.html\n"
);
}
static void display_total_stats(void)
{
struct stats added;
add_stats(&Modes.stats_alltime, &Modes.stats_current, &added);
display_stats(&added);
}
//
//=========================================================================
//
// This function is called a few times every second by main in order to
// perform tasks we need to do continuously, like accepting new clients
// from the net, refreshing the screen in interactive mode, and so forth
//
void backgroundTasks(void) {
static uint64_t next_stats_display;
static uint64_t next_stats_update;
static uint64_t next_json, next_history;
uint64_t now = mstime();
icaoFilterExpire();
trackPeriodicUpdate();
if (Modes.net) {
modesNetPeriodicWork();
}
// Refresh screen when in interactive mode
if (Modes.interactive) {
interactiveShowData();
}
// always update end time so it is current when requests arrive
Modes.stats_current.end = mstime();
if (now >= next_stats_update) {
int i;
if (next_stats_update == 0) {
next_stats_update = now + 60000;
} else {
Modes.stats_latest_1min = (Modes.stats_latest_1min + 1) % 15;
Modes.stats_1min[Modes.stats_latest_1min] = Modes.stats_current;
add_stats(&Modes.stats_current, &Modes.stats_alltime, &Modes.stats_alltime);
add_stats(&Modes.stats_current, &Modes.stats_periodic, &Modes.stats_periodic);
reset_stats(&Modes.stats_5min);
for (i = 0; i < 5; ++i)
add_stats(&Modes.stats_1min[(Modes.stats_latest_1min - i + 15) % 15], &Modes.stats_5min, &Modes.stats_5min);
reset_stats(&Modes.stats_15min);
for (i = 0; i < 15; ++i)
add_stats(&Modes.stats_1min[i], &Modes.stats_15min, &Modes.stats_15min);
reset_stats(&Modes.stats_current);
Modes.stats_current.start = Modes.stats_current.end = now;
if (Modes.json_dir)
writeJsonToFile("stats.json", generateStatsJson);
next_stats_update += 60000;
}
}
if (Modes.stats && now >= next_stats_display) {
if (next_stats_display == 0) {
next_stats_display = now + Modes.stats;
} else {
add_stats(&Modes.stats_periodic, &Modes.stats_current, &Modes.stats_periodic);
display_stats(&Modes.stats_periodic);
reset_stats(&Modes.stats_periodic);
next_stats_display += Modes.stats;
if (next_stats_display <= now) {
/* something has gone wrong, perhaps the system clock jumped */
next_stats_display = now + Modes.stats;
}
}
}
if (Modes.json_dir && now >= next_json) {
writeJsonToFile("aircraft.json", generateAircraftJson);
next_json = now + Modes.json_interval;
}
if (now >= next_history) {
int rewrite_receiver_json = (Modes.json_dir && Modes.json_aircraft_history[HISTORY_SIZE-1].content == NULL);
free(Modes.json_aircraft_history[Modes.json_aircraft_history_next].content); // might be NULL, that's OK.
Modes.json_aircraft_history[Modes.json_aircraft_history_next].content =
generateAircraftJson("/data/aircraft.json", &Modes.json_aircraft_history[Modes.json_aircraft_history_next].clen);
if (Modes.json_dir) {
char filebuf[PATH_MAX];
snprintf(filebuf, PATH_MAX, "history_%d.json", Modes.json_aircraft_history_next);
writeJsonToFile(filebuf, generateHistoryJson);
}
Modes.json_aircraft_history_next = (Modes.json_aircraft_history_next+1) % HISTORY_SIZE;
if (rewrite_receiver_json)
writeJsonToFile("receiver.json", generateReceiverJson); // number of history entries changed
next_history = now + HISTORY_INTERVAL;
}
}
//
//=========================================================================
//
//
//=========================================================================
//
int main(int argc, char **argv) {
int j;
// Set sane defaults
modesInitConfig();
// signal handlers:
signal(SIGINT, sigintHandler);
signal(SIGTERM, sigtermHandler);
// Parse the command line options
for (j = 1; j < argc; j++) {
int more = j+1 < argc; // There are more arguments
if (!strcmp(argv[j],"--freq") && more) {
Modes.freq = (int) strtoll(argv[++j],NULL,10);
} else if ( (!strcmp(argv[j], "--device") || !strcmp(argv[j], "--device-index")) && more) {
Modes.dev_name = strdup(argv[++j]);
} else if (!strcmp(argv[j],"--gain") && more) {
Modes.gain = (int) (atof(argv[++j])*10); // Gain is in tens of DBs
} else if (!strcmp(argv[j],"--dcfilter")) {
Modes.dc_filter = 1;
} else if (!strcmp(argv[j],"--measure-noise")) {
// Ignored
} else if (!strcmp(argv[j],"--fix")) {
Modes.nfix_crc = 1;
} else if (!strcmp(argv[j],"--no-fix")) {
Modes.nfix_crc = 0;
} else if (!strcmp(argv[j],"--no-crc-check")) {
Modes.check_crc = 0;
} else if (!strcmp(argv[j],"--phase-enhance")) {
// Ignored, always enabled
} else if (!strcmp(argv[j],"--raw")) {
Modes.raw = 1;
} else if (!strcmp(argv[j],"--net")) {
Modes.net = 1;
} else if (!strcmp(argv[j],"--modeac")) {
Modes.mode_ac = 1;
Modes.mode_ac_auto = 0;
} else if (!strcmp(argv[j],"--no-modeac-auto")) {
Modes.mode_ac_auto = 0;
} else if (!strcmp(argv[j],"--net-beast")) {
fprintf(stderr, "--net-beast ignored, use --net-bo-port to control where Beast output is generated\n");
} else if (!strcmp(argv[j],"--net-only")) {
Modes.net = 1;
Modes.sdr_type = SDR_NONE;
} else if (!strcmp(argv[j],"--net-heartbeat") && more) {
Modes.net_heartbeat_interval = (uint64_t)(1000 * atof(argv[++j]));
} else if (!strcmp(argv[j],"--net-ro-size") && more) {
Modes.net_output_flush_size = atoi(argv[++j]);
} else if (!strcmp(argv[j],"--net-ro-rate") && more) {
Modes.net_output_flush_interval = 1000 * atoi(argv[++j]) / 15; // backwards compatibility
} else if (!strcmp(argv[j],"--net-ro-interval") && more) {
Modes.net_output_flush_interval = (uint64_t)(1000 * atof(argv[++j]));
} else if (!strcmp(argv[j],"--net-ro-port") && more) {
free(Modes.net_output_raw_ports);
Modes.net_output_raw_ports = strdup(argv[++j]);
} else if (!strcmp(argv[j],"--net-ri-port") && more) {
free(Modes.net_input_raw_ports);
Modes.net_input_raw_ports = strdup(argv[++j]);
} else if (!strcmp(argv[j],"--net-bo-port") && more) {
free(Modes.net_output_beast_ports);
Modes.net_output_beast_ports = strdup(argv[++j]);
} else if (!strcmp(argv[j],"--net-bi-port") && more) {
free(Modes.net_input_beast_ports);
Modes.net_input_beast_ports = strdup(argv[++j]);
} else if (!strcmp(argv[j],"--net-bind-address") && more) {
free(Modes.net_bind_address);
Modes.net_bind_address = strdup(argv[++j]);
} else if (!strcmp(argv[j],"--net-http-port") && more) {
if (strcmp(argv[++j], "0")) {
fprintf(stderr, "warning: --net-http-port not supported in this build, option ignored.\n");
}
} else if (!strcmp(argv[j],"--net-sbs-port") && more) {
free(Modes.net_output_sbs_ports);
Modes.net_output_sbs_ports = strdup(argv[++j]);
} else if (!strcmp(argv[j],"--net-buffer") && more) {
Modes.net_sndbuf_size = atoi(argv[++j]);
} else if (!strcmp(argv[j],"--net-verbatim")) {
Modes.net_verbatim = 1;
} else if (!strcmp(argv[j],"--forward-mlat")) {
Modes.forward_mlat = 1;
} else if (!strcmp(argv[j],"--onlyaddr")) {
Modes.onlyaddr = 1;
} else if (!strcmp(argv[j],"--metric")) {
Modes.metric = 1;
} else if (!strcmp(argv[j],"--hae") || !strcmp(argv[j],"--gnss")) {
Modes.use_gnss = 1;
} else if (!strcmp(argv[j],"--aggressive")) {
#ifdef ALLOW_AGGRESSIVE
Modes.nfix_crc = MODES_MAX_BITERRORS;
#else
fprintf(stderr, "warning: --aggressive not supported in this build, option ignored.\n");
#endif
} else if (!strcmp(argv[j],"--interactive")) {
Modes.interactive = 1;
} else if (!strcmp(argv[j],"--interactive-ttl") && more) {
Modes.interactive_display_ttl = (uint64_t)(1000 * atof(argv[++j]));
} else if (!strcmp(argv[j],"--lat") && more) {
Modes.fUserLat = atof(argv[++j]);
} else if (!strcmp(argv[j],"--lon") && more) {
Modes.fUserLon = atof(argv[++j]);
} else if (!strcmp(argv[j],"--max-range") && more) {
Modes.maxRange = atof(argv[++j]) * 1852.0; // convert to metres
} else if (!strcmp(argv[j],"--debug") && more) {
char *f = argv[++j];
while(*f) {
switch(*f) {
case 'D': Modes.debug |= MODES_DEBUG_DEMOD; break;
case 'd': Modes.debug |= MODES_DEBUG_DEMODERR; break;
case 'C': Modes.debug |= MODES_DEBUG_GOODCRC; break;
case 'c': Modes.debug |= MODES_DEBUG_BADCRC; break;
case 'p': Modes.debug |= MODES_DEBUG_NOPREAMBLE; break;
case 'n': Modes.debug |= MODES_DEBUG_NET; break;
case 'j': Modes.debug |= MODES_DEBUG_JS; break;
default:
fprintf(stderr, "Unknown debugging flag: %c\n", *f);
exit(1);
break;
}
f++;
}
} else if (!strcmp(argv[j],"--stats")) {
if (!Modes.stats)
Modes.stats = (uint64_t)1 << 60; // "never"
} else if (!strcmp(argv[j],"--stats-range")) {
Modes.stats_range_histo = 1;
} else if (!strcmp(argv[j],"--stats-every") && more) {
Modes.stats = (uint64_t) (1000 * atof(argv[++j]));
} else if (!strcmp(argv[j],"--snip") && more) {
snipMode(atoi(argv[++j]));
exit(0);
} else if (!strcmp(argv[j],"--help")) {
showHelp();
exit(0);
} else if (!strcmp(argv[j],"--quiet")) {
Modes.quiet = 1;
} else if (!strcmp(argv[j],"--show-only") && more) {
Modes.show_only = (uint32_t) strtoul(argv[++j], NULL, 16);
} else if (!strcmp(argv[j],"--mlat")) {
Modes.mlat = 1;
} else if (!strcmp(argv[j],"--oversample")) {
// Ignored
#ifndef _WIN32
} else if (!strcmp(argv[j], "--write-json") && more) {
Modes.json_dir = strdup(argv[++j]);
} else if (!strcmp(argv[j], "--write-json-every") && more) {
Modes.json_interval = (uint64_t)(1000 * atof(argv[++j]));
if (Modes.json_interval < 100) // 0.1s
Modes.json_interval = 100;
} else if (!strcmp(argv[j], "--json-location-accuracy") && more) {
Modes.json_location_accuracy = atoi(argv[++j]);
#endif
} else if (sdrHandleOption(argc, argv, &j)) {
/* handled */
} else {
fprintf(stderr,
"Unknown or not enough arguments for option '%s'.\n\n",
argv[j]);
showHelp();
exit(1);
}
}
#ifdef _WIN32
// Try to comply with the Copyright license conditions for binary distribution
if (!Modes.quiet) {showCopyright();}
#endif
// Initialization
log_with_timestamp("%s %s starting up.", MODES_DUMP1090_VARIANT, MODES_DUMP1090_VERSION);
modesInit();
if (!sdrOpen()) {
exit(1);
}
if (Modes.net) {
modesInitNet();
}
// init stats:
Modes.stats_current.start = Modes.stats_current.end =
Modes.stats_alltime.start = Modes.stats_alltime.end =
Modes.stats_periodic.start = Modes.stats_periodic.end =
Modes.stats_5min.start = Modes.stats_5min.end =
Modes.stats_15min.start = Modes.stats_15min.end = mstime();
for (j = 0; j < 15; ++j)
Modes.stats_1min[j].start = Modes.stats_1min[j].end = Modes.stats_current.start;
// write initial json files so they're not missing
writeJsonToFile("receiver.json", generateReceiverJson);
writeJsonToFile("stats.json", generateStatsJson);
writeJsonToFile("aircraft.json", generateAircraftJson);
interactiveInit();
// If the user specifies --net-only, just run in order to serve network
// clients without reading data from the RTL device
if (Modes.sdr_type == SDR_NONE) {
while (!Modes.exit) {
struct timespec start_time;
start_cpu_timing(&start_time);
backgroundTasks();
end_cpu_timing(&start_time, &Modes.stats_current.background_cpu);
usleep(100000);
}
} else {
int watchdogCounter = 10; // about 1 second
// Create the thread that will read the data from the device.
pthread_mutex_lock(&Modes.data_mutex);
pthread_create(&Modes.reader_thread, NULL, readerThreadEntryPoint, NULL);
while (!Modes.exit) {
struct timespec start_time;
if (Modes.first_free_buffer == Modes.first_filled_buffer) {
/* wait for more data.
* we should be getting data every 50-60ms. wait for max 100ms before we give up and do some background work.
* this is fairly aggressive as all our network I/O runs out of the background work!
*/
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_nsec += 100000000;
normalize_timespec(&ts);
pthread_cond_timedwait(&Modes.data_cond, &Modes.data_mutex, &ts); // This unlocks Modes.data_mutex, and waits for Modes.data_cond
}
// Modes.data_mutex is locked, and possibly we have data.
// copy out reader CPU time and reset it
add_timespecs(&Modes.reader_cpu_accumulator, &Modes.stats_current.reader_cpu, &Modes.stats_current.reader_cpu);
Modes.reader_cpu_accumulator.tv_sec = 0;
Modes.reader_cpu_accumulator.tv_nsec = 0;
if (Modes.first_free_buffer != Modes.first_filled_buffer) {
// FIFO is not empty, process one buffer.
struct mag_buf *buf;
start_cpu_timing(&start_time);
buf = &Modes.mag_buffers[Modes.first_filled_buffer];
// Process data after releasing the lock, so that the capturing
// thread can read data while we perform computationally expensive
// stuff at the same time.
pthread_mutex_unlock(&Modes.data_mutex);
demodulate2400(buf);
if (Modes.mode_ac) {
demodulate2400AC(buf);
}
Modes.stats_current.samples_processed += buf->length;
Modes.stats_current.samples_dropped += buf->dropped;
end_cpu_timing(&start_time, &Modes.stats_current.demod_cpu);
// Mark the buffer we just processed as completed.
pthread_mutex_lock(&Modes.data_mutex);
Modes.first_filled_buffer = (Modes.first_filled_buffer + 1) % MODES_MAG_BUFFERS;
pthread_cond_signal(&Modes.data_cond);
pthread_mutex_unlock(&Modes.data_mutex);
watchdogCounter = 10;
} else {
// Nothing to process this time around.
pthread_mutex_unlock(&Modes.data_mutex);
if (--watchdogCounter <= 0) {
log_with_timestamp("No data received from the SDR for a long time, it may have wedged");
watchdogCounter = 600;
}
}
start_cpu_timing(&start_time);
backgroundTasks();
end_cpu_timing(&start_time, &Modes.stats_current.background_cpu);
pthread_mutex_lock(&Modes.data_mutex);
}
pthread_mutex_unlock(&Modes.data_mutex);
log_with_timestamp("Waiting for receive thread termination");
pthread_join(Modes.reader_thread,NULL); // Wait on reader thread exit
pthread_cond_destroy(&Modes.data_cond); // Thread cleanup - only after the reader thread is dead!
pthread_mutex_destroy(&Modes.data_mutex);
}
interactiveCleanup();
// If --stats were given, print statistics
if (Modes.stats) {
display_total_stats();
}
sdrClose();
if (Modes.exit == 1) {
log_with_timestamp("Normal exit.");
return 0;
} else {
log_with_timestamp("Abnormal exit.");
return 1;
}
}
//
//=========================================================================
//
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