// Part of dump1090, a Mode S message decoder for RTLSDR devices. // // dump1090.c: main program & miscellany // // Copyright (c) 2014-2016 Oliver Jowett // // 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 . // This file incorporates work covered by the following copyright and // permission notice: // // Copyright (C) 2012 by Salvatore Sanfilippo // // 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 // // ============================= 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.html_dir = HTMLPATH; 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); Modes.exit = 1; // just in case pthread_cond_signal(&Modes.data_cond); pthread_mutex_unlock(&Modes.data_mutex); #ifndef _WIN32 pthread_exit(NULL); #else return NULL; #endif } // // ============================== 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" "| dump1090 ModeS Receiver %45s |\n" "-----------------------------------------------------------------------------\n", MODES_DUMP1090_VARIANT " " MODES_DUMP1090_VERSION); sdrShowHelp(); printf( " Common options\n" "\n" "--gain Set gain (default: max gain. Use -10 for auto-gain)\n" "--freq Set frequency (default: 1090 Mhz)\n" "--interactive Interactive mode refreshing data on screen. Implies --throttle\n" "--interactive-ttl Remove from list if idle for (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 address to bind to (default: Any; Use 127.0.0.1 for private)\n" "--net-ri-port TCP raw input listen ports (default: 30001)\n" "--net-ro-port TCP raw output listen ports (default: 30002)\n" "--net-sbs-port TCP BaseStation output listen ports (default: 30003)\n" "--net-bi-port TCP Beast input listen ports (default: 30004,30104)\n" "--net-bo-port TCP Beast output listen ports (default: 30005)\n" "--net-ro-size TCP output minimum size (default: 0)\n" "--net-ro-interval TCP output memory flush rate in seconds (default: 0)\n" "--net-heartbeat TCP heartbeat rate in seconds (default: 60 sec; 0 to disable)\n" "--net-buffer 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 Reference/receiver latitude for surface posn (opt)\n" "--lon Reference/receiver longitude for surface posn (opt)\n" "--max-range 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 Show and reset stats every 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 Strip IQ file removing samples < level\n" "--debug Debug mode (verbose), see README for details\n" "--quiet Disable output to stdout. Use for daemon applications\n" "--show-only Show only messages from the given ICAO on stdout\n" "--html-dir Use as base directory for the internal HTTP server. Defaults to " HTMLPATH "\n" "--write-json Periodically write json output to (for serving by a separate webserver)\n" "--write-json-every Write json output every t seconds (default 1)\n" "--json-location-accuracy 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 = now; 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 } else if (!strcmp(argv[j], "--html-dir") && more) { Modes.html_dir = strdup(argv[++j]); #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(); } log_with_timestamp("Normal exit."); sdrClose(); #ifndef _WIN32 pthread_exit(0); #else return (0); #endif } // //========================================================================= //