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readsb.c
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// Part of readsb, a Mode-S/ADSB/TIS message decoder.
//
// readsb.c: main program & miscellany
//
// Copyright (c) 2019 Michael Wolf <[email protected]>
//
// This code is based on a detached fork of dump1090-fa.
//
// Copyright (c) 2014-2016 Oliver Jowett <[email protected]>
//
// This file is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// 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
// license:
//
// Copyright (C) 2012 by Salvatore Sanfilippo <[email protected]>
//
// 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 <sched.h>
#include "readsb.h"
#include "help.h"
#include <sys/time.h>
#include <sys/resource.h>
struct _Modes Modes;
struct _Threads Threads;
static void loadReplaceState();
static void checkReplaceState();
static void backgroundTasks(int64_t now);
static error_t parse_opt(int key, char *arg, struct argp_state *state);
//
// ============================= Utility functions ==========================
//
static void cleanup_and_exit(int code);
void setExit(int arg) {
// Signal to main loop that program is exiting soon, delay depends on cli arguments
// see main loop for details
Modes.exitSoon = arg;
#ifndef NO_EVENT_FD
uint64_t one = 1;
ssize_t res = write(Modes.exitSoonEventfd, &one, sizeof(one));
MODES_NOTUSED(res);
#endif
}
static void exitHandler(int sig) {
setExit(1);
char *sigX = NULL;
if (sig == SIGTERM) { sigX = "SIGTERM"; }
if (sig == SIGINT) { sigX = "SIGINT"; }
if (sig == SIGQUIT) { sigX = "SIGQUIT"; }
if (sig == SIGHUP) { sigX = "SIGHUP"; }
log_with_timestamp("Caught %s, shutting down...", sigX);
}
void receiverPositionChanged(float lat, float lon, float alt) {
log_with_timestamp("Autodetected receiver location: %.5f, %.5f at %.0fm AMSL", lat, lon, alt);
if (Modes.json_dir) {
free(writeJsonToFile(Modes.json_dir, "receiver.json", generateReceiverJson()).buffer); // location changed
}
}
//
// =============================== Initialization ===========================
//
static void configSetDefaults(void) {
// Default everything to zero/NULL
memset(&Modes, 0, sizeof (Modes));
for (int i = 0; i < 256; i++) {
Modes.threadNumber[i] = i;
}
// 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.db_file = strdup("/usr/local/share/tar1090/git-db/aircraft.csv.gz");
Modes.db_file = NULL;
Modes.latString = strdup("");
Modes.lonString = strdup("");
Modes.net_input_raw_ports = strdup("0");
Modes.net_output_raw_ports = strdup("0");
Modes.net_output_uat_replay_ports = strdup("0");
Modes.net_input_uat_ports = strdup("0");
Modes.net_output_sbs_ports = strdup("0");
Modes.net_input_sbs_ports = strdup("0");
Modes.net_input_beast_ports = strdup("0");
Modes.net_input_planefinder_ports = strdup("0");
Modes.net_output_beast_ports = strdup("0");
Modes.net_output_beast_reduce_ports = strdup("0");
Modes.net_output_beast_reduce_interval = 250;
Modes.beast_reduce_filter_distance = -1;
Modes.beast_reduce_filter_altitude = -1;
Modes.net_output_vrs_ports = strdup("0");
Modes.net_output_vrs_interval = 5 * SECONDS;
Modes.net_output_json_ports = strdup("0");
Modes.net_output_api_ports = strdup("0");
Modes.net_input_jaero_ports = strdup("0");
Modes.net_output_jaero_ports = strdup("0");
Modes.net_connector_delay = 30 * 1000;
Modes.interactive_display_ttl = MODES_INTERACTIVE_DISPLAY_TTL;
Modes.json_interval = 1000;
Modes.json_location_accuracy = 2;
Modes.maxRange = 1852 * 450; // 450 nmi default max range
Modes.nfix_crc = 1;
Modes.biastee = 0;
Modes.position_persistence = 4;
Modes.net_sndbuf_size = 2; // Default to 256 kB SNDBUF / RCVBUF
Modes.net_output_flush_size = 1280; // Default to 1280 Bytes
Modes.net_output_flush_interval = 50; // Default to 50 ms
Modes.net_output_flush_interval_beast_reduce = -1; // default to net_output_flush_interval after config parse if not configured
Modes.netReceiverId = 0;
Modes.netIngest = 0;
Modes.json_trace_interval = 20 * 1000;
Modes.state_write_interval = 1 * HOURS;
Modes.heatmap_current_interval = -15;
Modes.heatmap_interval = 60 * SECONDS;
Modes.json_reliable = -13;
Modes.acasFD1 = -1; // set to -1 so it's clear we don't have that fd
Modes.acasFD2 = -1; // set to -1 so it's clear we don't have that fd
Modes.sbsOverrideSquawk = -1;
Modes.mlatForceInterval = 30 * SECONDS;
Modes.mlatForceDistance = 25 * 1e3; // 25 km
Modes.fUserAlt = -2e6;
Modes.enable_zstd = 1;
Modes.currentTask = "unset";
Modes.joinTimeout = 30 * SECONDS;
Modes.state_chunk_size = 12 * 1024 * 1024;
Modes.state_chunk_size_read = Modes.state_chunk_size;
Modes.decodeThreads = 1;
Modes.filterDF = 0;
Modes.filterDFbitset = 0;
Modes.cpr_focus = BADDR;
Modes.leg_focus = BADDR;
Modes.trace_focus = BADDR;
Modes.show_only = BADDR;
Modes.process_only = BADDR;
Modes.outline_json = 1; // enable by default
Modes.range_outline_duration = 24 * HOURS;
//Modes.receiver_focus = 0x123456;
//
Modes.trackExpireJaero = TRACK_EXPIRE_JAERO;
Modes.fixDF = 1;
sdrInitConfig();
reset_stats(&Modes.stats_current);
for (int i = 0; i < 90; ++i) {
reset_stats(&Modes.stats_10[i]);
}
//receiverTest();
struct rlimit limits;
int res = getrlimit(RLIMIT_NOFILE, &limits);
if (res != 0) {
fprintf(stderr, "WARNING: getrlimit(RLIMIT_NOFILE, &limits) returned the following error: \"%s\". Assuming bad limit query function, using up to 64 file descriptors \n",
strerror(errno));
Modes.max_fds = 64;
} else {
uint64_t limit = limits.rlim_cur;
// check limit for unreasonableness
if (limit < (uint64_t) 64) {
fprintf(stderr, "WARNING: getrlimit(RLIMIT_NOFILE, &limits) returned less than 64 fds for readsb to work with. Assuming bad limit query function, using up to 64 file descriptors. Fix RLIMIT!\n");
Modes.max_fds = 64;
} else if (limits.rlim_cur == RLIM_INFINITY) {
Modes.max_fds = INT32_MAX;
} else if (limit > (uint64_t) INT32_MAX) {
fprintf(stderr, "WARNING: getrlimit(RLIMIT_NOFILE, &limits) returned more than INT32_MAX ... This is just weird.\n");
Modes.max_fds = INT32_MAX;
} else {
Modes.max_fds = (int) limit;
}
}
Modes.max_fds -= 32; // reserve some fds for things we don't account for later like json writing.
// this is an high estimate ... if ppl run out of fds for other stuff they should up rlimit
Modes.sdr_buf_size = 16 * 16 * 1024;
// in seconds, default to 1 hour
Modes.dump_interval = 60 * 60;
Modes.dump_compressionLevel = 4;
Modes.ping_reduce = PING_REDUCE;
Modes.ping_reject = PING_REJECT;
Modes.binCraftVersion = 20240218;
Modes.messageRateMult = 1.0f;
Modes.apiShutdownDelay = 0 * SECONDS;
// default this on
Modes.enableAcasCsv = 1;
Modes.enableAcasJson = 1;
}
//
//=========================================================================
//
static void modesInit(void) {
int64_t now = mstime();
Modes.next_stats_update = roundSeconds(10, 5, now + 10 * SECONDS);
Modes.next_stats_display = now + Modes.stats_display_interval;
pthread_mutex_init(&Modes.traceDebugMutex, NULL);
pthread_mutex_init(&Modes.hungTimerMutex, NULL);
pthread_mutex_init(&Modes.sdrControlMutex, NULL);
threadInit(&Threads.reader, "reader");
threadInit(&Threads.upkeep, "upkeep");
threadInit(&Threads.decode, "decode");
threadInit(&Threads.json, "json");
threadInit(&Threads.globeJson, "globeJson");
threadInit(&Threads.globeBin, "globeBin");
threadInit(&Threads.misc, "misc");
threadInit(&Threads.apiUpdate, "apiUpdate");
if (Modes.json_globe_index || Modes.netReceiverId || AIRCRAFT_HASH_BITS > 16) {
// to keep decoding and the other threads working well, don't use all available processors
Modes.allPoolSize = imax(1, Modes.num_procs);
} else {
Modes.allPoolSize = 1;
}
Modes.allTasks = allocate_task_group(2 * Modes.allPoolSize);
Modes.allPool = threadpool_create(Modes.allPoolSize, 4);
for (int i = 0; i <= GLOBE_MAX_INDEX; i++) {
ca_init(&Modes.globeLists[i]);
}
ca_init(&Modes.aircraftActive);
geomag_init();
Modes.sample_rate = (double)2400000.0;
// Allocate the various buffers used by Modes
Modes.trailing_samples = (unsigned)((MODES_PREAMBLE_US + MODES_LONG_MSG_BITS + 16) * 1e-6 * Modes.sample_rate);
if (!Modes.net_only) {
for (int i = 0; i < MODES_MAG_BUFFERS; ++i) {
size_t alloc = (Modes.sdr_buf_samples + Modes.trailing_samples) * sizeof (uint16_t);
if ((Modes.mag_buffers[i].data = cmalloc(alloc)) == NULL) {
fprintf(stderr, "Out of memory allocating magnitude buffer.\n");
exit(1);
}
memset(Modes.mag_buffers[i].data, 0, alloc);
Modes.mag_buffers[i].length = 0;
Modes.mag_buffers[i].dropped = 0;
Modes.mag_buffers[i].sampleTimestamp = 0;
}
}
// Prepare error correction tables
modesChecksumInit(Modes.nfix_crc);
icaoFilterInit();
modeACInit();
icaoFilterAdd(Modes.show_only);
init_globe_index();
quickInit();
}
static void lockThreads() {
for (int i = 0; i < Modes.lockThreadsCount; i++) {
//fprintf(stderr, "locking %s\n", Modes.lockThreads[i]->name);
Modes.currentTask = Modes.lockThreads[i]->name;
pthread_mutex_lock(&Modes.lockThreads[i]->mutex);
}
}
static void unlockThreads() {
for (int i = Modes.lockThreadsCount - 1; i >= 0; i--) {
//fprintf(stderr, "unlocking %s\n", Modes.lockThreads[i]->name);
pthread_mutex_unlock(&Modes.lockThreads[i]->mutex);
}
}
static int64_t ms_until_priority() {
int64_t now = mstime();
int64_t mono = mono_milli_seconds();
int64_t ms_until_run = imin(
Modes.next_stats_update - now,
Modes.next_remove_stale - mono
);
if (Modes.replace_state_inhibit_traces_until) {
if (mono > Modes.replace_state_inhibit_traces_until) {
Modes.replace_state_inhibit_traces_until = 0;
} else if (ms_until_run > 100) {
ms_until_run = 80;
}
}
if (ms_until_run > 0 && Modes.replace_state_blob) {
ms_until_run = 0;
}
return ms_until_run;
}
// function to check if priorityTasksRun() needs to run
int priorityTasksPending() {
if (ms_until_priority() <= 0) {
return 1; // something to do
} else {
return 0; // nothing to do
}
}
//
// Entry point for periodic updates
//
void priorityTasksRun() {
if (0) {
int64_t now = mstime();
time_t nowTime = floor(now / 1000.0);
struct tm local;
gmtime_r(&nowTime, &local);
char timebuf[512];
strftime(timebuf, 128, "%T", &local);
printf("priorityTasksRun: utcTime: %s.%03lld epoch: %.3f\n", timebuf, (long long) now % 1000, now / 1000.0);
}
pthread_mutex_lock(&Modes.hungTimerMutex);
startWatch(&Modes.hungTimer1);
pthread_mutex_unlock(&Modes.hungTimerMutex);
Modes.currentTask = "priorityTasks_start";
// stop all threads so we can remove aircraft from the list.
// adding aircraft does not need to be done with locking:
// the worst case is that the newly added aircraft is skipped as it's not yet
// in the cache used by the json threads.
Modes.currentTask = "locking";
lockThreads();
Modes.currentTask = "locked";
int64_t now = mstime();
int64_t mono = mono_milli_seconds();
int removed_stale = 0;
static int64_t last_periodic_mono;
int64_t periodic_interval = mono - last_periodic_mono;
if (periodic_interval > 5 * SECONDS && periodic_interval < 9999 * HOURS && last_periodic_mono && !(Modes.syntethic_now_suppress_errors && Modes.synthetic_now)) {
fprintf(stderr, "<3> priorityTasksRun didn't run for %.1f seconds!\n", periodic_interval / 1000.0);
}
last_periodic_mono = mono;
struct timespec watch;
startWatch(&watch);
struct timespec start_time;
start_monotonic_timing(&start_time);
struct timespec before = threadpool_get_cumulative_thread_time(Modes.allPool);
if (Modes.replace_state_blob) {
loadReplaceState();
checkReplaceState();
}
// finish db update under lock
if (dbFinishUpdate()) {
// don't do trackRemoveStale at the same time as dbFinishUpdate
} else if (mono >= Modes.next_remove_stale) {
pthread_mutex_lock(&Modes.hungTimerMutex);
startWatch(&Modes.hungTimer2);
pthread_mutex_unlock(&Modes.hungTimerMutex);
Modes.currentTask = "trackRemoveStale";
trackRemoveStale(now);
traceDelete();
int64_t interval = mono - Modes.next_remove_stale;
if (interval > 5 * SECONDS && interval < 9999 * HOURS && Modes.next_remove_stale && !(Modes.syntethic_now_suppress_errors && Modes.synthetic_now)) {
fprintf(stderr, "<3> removeStale didn't run for %.1f seconds!\n", interval / 1000.0);
}
Modes.next_remove_stale = mono + REMOVE_STALE_INTERVAL;
removed_stale = 1;
}
int64_t elapsed1 = lapWatch(&watch);
if (now >= Modes.next_stats_update) {
Modes.updateStats = 1;
}
if (Modes.updateStats) {
Modes.currentTask = "statsUpdate";
statsUpdate(now); // needs to happen under lock
}
int64_t elapsed2 = lapWatch(&watch);
Modes.currentTask = "unlocking";
unlockThreads();
Modes.currentTask = "unlocked";
static int64_t antiSpam;
if (0 || (Modes.debug_removeStaleDuration) || ((elapsed1 > 150 || elapsed2 > 150) && mono > antiSpam + 30 * SECONDS)) {
fprintf(stderr, "<3>High load: removeStale took %"PRIi64"/%"PRIi64" ms! stats: %d (suppressing for 30 seconds)\n", elapsed1, elapsed2, Modes.updateStats);
antiSpam = mono;
}
//fprintf(stderr, "running for %ld ms\n", getUptime());
//fprintf(stderr, "removeStale took %"PRIu64" ms, running for %ld ms\n", elapsed, getUptime());
if (Modes.updateStats) {
Modes.currentTask = "statsReset";
statsResetCount();
int64_t now = mstime();
Modes.currentTask = "statsCount";
statsCountAircraft(now);
Modes.currentTask = "statsProcess";
statsProcess(now);
Modes.updateStats = 0;
if (Modes.json_dir) {
free(writeJsonToFile(Modes.json_dir, "status.json", generateStatusJson(now)).buffer);
free(writeJsonToFile(Modes.json_dir, "status.prom", generateStatusProm(now)).buffer);
}
}
end_monotonic_timing(&start_time, &Modes.stats_current.remove_stale_cpu);
if (removed_stale) {
struct timespec after = threadpool_get_cumulative_thread_time(Modes.allPool);
timespec_add_elapsed(&before, &after, &Modes.stats_current.remove_stale_cpu);
}
Modes.currentTask = "priorityTasks_end";
}
//
//=========================================================================
//
// We read data using a thread, so the main thread only handles decoding
// without caring about data acquisition
//
static void *readerEntryPoint(void *arg) {
MODES_NOTUSED(arg);
srandom(get_seed());
if (!sdrOpen()) {
Modes.sdrOpenFailed = 1;
setExit(2); // unexpected exit
log_with_timestamp("sdrOpen() failed, exiting!");
return NULL;
}
setPriorityPthread();
if (sdrHasRun()) {
sdrRun();
// Wake the main thread (if it's still waiting)
if (!Modes.exit)
setExit(2); // unexpected exit
} else {
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
pthread_mutex_lock(&Threads.reader.mutex);
while (!Modes.exit) {
threadTimedWait(&Threads.reader, &ts, 15 * SECONDS);
}
pthread_mutex_unlock(&Threads.reader.mutex);
}
sdrClose();
return NULL;
}
static void *jsonEntryPoint(void *arg) {
MODES_NOTUSED(arg);
srandom(get_seed());
// set this thread low priority
setLowestPriorityPthread();
int64_t next_history = mstime();
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
pthread_mutex_lock(&Threads.json.mutex);
threadpool_buffer_t pass_buffer = { 0 };
threadpool_buffer_t zstd_buffer = { 0 };
ZSTD_CCtx* cctx = NULL;
if (Modes.enable_zstd) {
//if (Modes.debug_zstd) { fprintf(stderr, "calling ZSTD_createCCtx()\n"); }
cctx = ZSTD_createCCtx();
//if (Modes.debug_zstd) { fprintf(stderr, "ZSTD_createCCtx() returned %p\n", cctx); }
}
while (!Modes.exit) {
struct timespec start_time;
start_cpu_timing(&start_time);
int64_t now = mstime();
// old direct creation, slower when creating json for an aircraft more than once
//struct char_buffer cb = generateAircraftJson(0);
if (Modes.onlyBin < 2) {
// new way: use the apiBuffer of json fragments
struct char_buffer cb = apiGenerateAircraftJson(&pass_buffer);
if (Modes.json_gzip) {
writeJsonToGzip(Modes.json_dir, "aircraft.json.gz", cb, 2);
}
writeJsonToFile(Modes.json_dir, "aircraft.json", cb);
if ((Modes.legacy_history || ((ALL_JSON) && Modes.onlyBin < 2)) && now >= next_history) {
char filebuf[PATH_MAX];
snprintf(filebuf, PATH_MAX, "history_%d.json", Modes.json_aircraft_history_next);
writeJsonToFile(Modes.json_dir, filebuf, cb);
if (!Modes.json_aircraft_history_full) {
free(writeJsonToFile(Modes.json_dir, "receiver.json", generateReceiverJson()).buffer); // number of history entries changed
if (Modes.json_aircraft_history_next == HISTORY_SIZE - 1)
Modes.json_aircraft_history_full = 1;
}
Modes.json_aircraft_history_next = (Modes.json_aircraft_history_next + 1) % HISTORY_SIZE;
next_history = now + HISTORY_INTERVAL;
}
}
if (Modes.debug_recent) {
struct char_buffer cb = generateAircraftJson(1 * SECONDS);
writeJsonToFile(Modes.json_dir, "aircraft_recent.json", cb);
sfree(cb.buffer);
}
struct char_buffer cb3 = generateAircraftBin(&pass_buffer);
if (Modes.enableBinGz) {
writeJsonToGzip(Modes.json_dir, "aircraft.binCraft", cb3, 1);
}
//fprintf(stderr, "uncompressed size %ld\n", (long) cb3.len);
if (Modes.enable_zstd) {
writeJsonToFile(Modes.json_dir, "aircraft.binCraft.zst", generateZstd(cctx, &zstd_buffer, cb3, 1));
}
if (Modes.json_globe_index) {
struct char_buffer cb2 = generateGlobeBin(-1, 1, &pass_buffer);
if (Modes.enableBinGz) {
writeJsonToGzip(Modes.json_dir, "globeMil_42777.binCraft", cb2, 1);
}
if (Modes.enable_zstd) {
writeJsonToFile(Modes.json_dir, "globeMil_42777.binCraft.zst", ident(generateZstd(cctx, &zstd_buffer, cb2, 1)));
}
}
end_cpu_timing(&start_time, &Modes.stats_current.aircraft_json_cpu);
//fprintTimePrecise(stderr, mstime());
//fprintf(stderr, " wrote --write-json-every stuff to --write-json \n");
// we should exit this wait early due to a cond_signal from api.c
threadTimedWait(&Threads.json, &ts, Modes.json_interval * 3);
}
ZSTD_freeCCtx(cctx);
free_threadpool_buffer(&zstd_buffer);
free_threadpool_buffer(&pass_buffer);
pthread_mutex_unlock(&Threads.json.mutex);
return NULL;
}
static void *globeJsonEntryPoint(void *arg) {
MODES_NOTUSED(arg);
srandom(get_seed());
// set this thread low priority
setLowestPriorityPthread();
if (Modes.onlyBin > 0)
return NULL;
pthread_mutex_lock(&Threads.globeJson.mutex);
threadpool_buffer_t pass_buffer = { 0 };
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
while (!Modes.exit) {
struct timespec start_time;
start_cpu_timing(&start_time);
for (int j = 0; j <= Modes.json_globe_indexes_len; j++) {
int index = Modes.json_globe_indexes[j];
char filename[32];
snprintf(filename, 31, "globe_%04d.json", index);
struct char_buffer cb = apiGenerateGlobeJson(index, &pass_buffer);
writeJsonToGzip(Modes.json_dir, filename, cb, 1);
}
end_cpu_timing(&start_time, &Modes.stats_current.globe_json_cpu);
// we should exit this wait early due to a cond_signal from api.c
threadTimedWait(&Threads.globeJson, &ts, Modes.json_interval * 3);
}
free_threadpool_buffer(&pass_buffer);
pthread_mutex_unlock(&Threads.globeJson.mutex);
return NULL;
}
static void *globeBinEntryPoint(void *arg) {
MODES_NOTUSED(arg);
srandom(get_seed());
// set this thread low priority
setLowestPriorityPthread();
int part = 0;
int n_parts = 8; // power of 2
int64_t sleep_ms = Modes.json_interval / n_parts;
pthread_mutex_lock(&Threads.globeBin.mutex);
threadpool_buffer_t pass_buffer = { 0 };
threadpool_buffer_t zstd_buffer = { 0 };
ZSTD_CCtx* cctx = NULL;
if (Modes.enable_zstd) {
cctx = ZSTD_createCCtx();
}
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
while (!Modes.exit) {
char filename[32];
struct timespec start_time;
start_cpu_timing(&start_time);
for (int j = 0; j < Modes.json_globe_indexes_len; j++) {
if (j % n_parts != part)
continue;
int index = Modes.json_globe_indexes[j];
struct char_buffer cb2 = generateGlobeBin(index, 0, &pass_buffer);
if (Modes.enableBinGz) {
snprintf(filename, 31, "globe_%04d.binCraft", index);
writeJsonToGzip(Modes.json_dir, filename, cb2, 1);
}
if (Modes.enable_zstd) {
snprintf(filename, 31, "globe_%04d.binCraft.zst", index);
writeJsonToFile(Modes.json_dir, filename, ident(generateZstd(cctx, &zstd_buffer, cb2, 1)));
}
struct char_buffer cb3 = generateGlobeBin(index, 1, &pass_buffer);
if (Modes.enableBinGz) {
snprintf(filename, 31, "globeMil_%04d.binCraft", index);
writeJsonToGzip(Modes.json_dir, filename, cb3, 1);
}
if (Modes.enable_zstd) {
snprintf(filename, 31, "globeMil_%04d.binCraft.zst", index);
writeJsonToFile(Modes.json_dir, filename, ident(generateZstd(cctx, &zstd_buffer, cb3, 1)));
}
}
part++;
part %= n_parts;
end_cpu_timing(&start_time, &Modes.stats_current.bin_cpu);
threadTimedWait(&Threads.globeBin, &ts, sleep_ms);
}
ZSTD_freeCCtx(cctx);
free_threadpool_buffer(&zstd_buffer);
free_threadpool_buffer(&pass_buffer);
pthread_mutex_unlock(&Threads.globeBin.mutex);
return NULL;
}
static void gainStatistics(struct mag_buf *buf) {
static uint64_t loudEvents;
static uint64_t noiseLowSamples;
static uint64_t noiseHighSamples;
static uint64_t totalSamples;
static int slowRise;
static int64_t nextRaiseAgc;
loudEvents += buf->loudEvents;
noiseLowSamples += buf->noiseLowSamples;
noiseHighSamples += buf->noiseHighSamples;
totalSamples += buf->length;
double interval = 0.5;
double riseTime = 15;
if (totalSamples < interval * Modes.sample_rate) {
return;
}
double noiseLowPercent = noiseLowSamples / (double) totalSamples * 100.0;
double noiseHighPercent = noiseHighSamples / (double) totalSamples * 100.0;
if (!Modes.autoGain) {
goto reset;
}
// 29 gain values for typical rtl-sdr
// allow startup to sweep entire range quickly, almost half it for double steps
int noiseLow = noiseLowPercent > 5; // too many samples < noiseLowThreshold
int noiseHigh = noiseHighPercent < 1; // too few samples < noiseHighThreshold
int loud = loudEvents > 1;
int veryLoud = loudEvents > 5;
if (loud || noiseHigh) {
Modes.lowerGain = 1;
if (veryLoud && !Modes.gainStartup) {
Modes.lowerGain = 2;
}
} else if (noiseLow) {
if (Modes.gainStartup || slowRise > riseTime / interval) {
slowRise = 0;
Modes.increaseGain = 1;
} else {
slowRise++;
}
}
if (Modes.increaseGain && Modes.gain == 496 && buf->sysTimestamp < nextRaiseAgc) {
goto reset;
}
if (Modes.increaseGain || Modes.lowerGain) {
if (Modes.gainStartup) {
Modes.lowerGain *= Modes.gainStartup;
Modes.increaseGain *= Modes.gainStartup;
}
char *reason = "";
if (veryLoud) {
reason = "decreasing gain, many strong signals found: ";
} else if (loud) {
reason = "decreasing gain, strong signal found: ";
} else if (noiseHigh) {
reason = "decreasing gain, noise too high: ";
} else if (noiseLow) {
reason = "increasing gain, noise too low: ";
}
sdrSetGain(reason);
if (Modes.gain == MODES_RTL_AGC) {
// switching to AGC is only done every 5 minutes to avoid oscillations due to the large step
nextRaiseAgc = buf->sysTimestamp + 5 * MINUTES;
}
if (0) {
fprintf(stderr, "%s noiseLow: %5.2f %% noiseHigh: %5.2f %% loudEvents: %4lld\n", reason, noiseLowPercent, noiseHighPercent, (long long) loudEvents);
}
}
reset:
Modes.gainStartup /= 2;
loudEvents = 0;
noiseLowSamples = 0;
noiseHighSamples = 0;
totalSamples = 0;
}
static void timingStatistics(struct mag_buf *buf) {
static int64_t last_ts;
int64_t elapsed_ts = buf->sysMicroseconds - last_ts;
// nominal time in us between two SDR callbacks
int64_t nominal = Modes.sdr_buf_samples * 1000LL * 1000LL / Modes.sample_rate;
int64_t jitter = elapsed_ts - nominal;
if (last_ts && Modes.log_usb_jitter && fabs((double)jitter) > Modes.log_usb_jitter) {
fprintf(stderr, "libusb callback jitter: %6.0f us\n", (double) jitter);
}
static int64_t last_sys;
if (last_sys || buf->sampleTimestamp * (1 / 12e6) > 10) {
static int64_t last_sample;
static int64_t interval;
int64_t nominal_interval = 30 * SECONDS * 1000;
if (!last_sys) {
last_sys = buf->sysMicroseconds;
last_sample = buf->sampleTimestamp;
interval = nominal_interval;
}
double elapsed_sys = buf->sysMicroseconds - last_sys;
// every 30 seconds
if ((elapsed_sys > interval && fabs((double) jitter) < 100) || elapsed_sys > interval * 3 / 2) {
// adjust interval heuristically
interval += (nominal_interval - elapsed_sys) / 4;
double elapsed_sample = buf->sampleTimestamp - last_sample;
double freq_ratio = elapsed_sample / (elapsed_sys * 12.0);
double diff_us = elapsed_sample / 12.0 - elapsed_sys;
double ppm = (freq_ratio - 1) * 1e6;
Modes.estimated_ppm = ppm;
if (Modes.devel_log_ppm && fabs(ppm) > Modes.devel_log_ppm) {
fprintf(stderr, "SDR ppm: %8.1f elapsed: %6.0f ms diff: %6.0f us last jitter: %6.0f\n", ppm, elapsed_sys / 1000.0, diff_us, (double) jitter);
}
if (fabs(ppm) > 600) {
if (ppm < -1000) {
int packets_lost = (int) nearbyint(ppm / -1820);
Modes.stats_current.samples_lost += packets_lost * Modes.sdr_buf_samples;
fprintf(stderr, "Lost %d packets (%.1f us) on USB, MLAT could be UNSTABLE, check sync! (ppm: %.0f)"
"(or the system clock jumped for some reason)\n", packets_lost, diff_us, ppm);
} else {
fprintf(stderr, "SDR ppm out of specification (could cause MLAT issues) or local clock jumped / not syncing with ntp or chrony! ppm: %.0f\n", ppm);
}
}
last_sys = buf->sysMicroseconds;
last_sample = buf->sampleTimestamp;
}
}
last_ts = buf->sysMicroseconds;
}
static void *decodeEntryPoint(void *arg) {
MODES_NOTUSED(arg);
srandom(get_seed());
pthread_mutex_lock(&Threads.decode.mutex);
modesInitNet();
/* If the user specifies --net-only, just run in order to serve network
* clients without reading data from the RTL device.
* This rules also in case a local Mode-S Beast is connected via USB.
*/
//fprintf(stderr, "startup complete after %.3f seconds.\n", getUptime() / 1000.0);
interactiveInit();
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
int64_t now = mstime();
int64_t mono = mono_milli_seconds();
if (Modes.net_only) {
while (!Modes.exit) {
struct timespec start_time;
// in case we're not waiting in backgroundTasks and priorityTasks doesn't have a chance to schedule
mono = mono_milli_seconds();
if (mono > Modes.next_remove_stale + 5 * SECONDS) {
threadTimedWait(&Threads.decode, &ts, 1);
}
start_cpu_timing(&start_time);
// sleep via epoll_wait in net_periodic_work
now = mstime();
backgroundTasks(now);
end_cpu_timing(&start_time, &Modes.stats_current.background_cpu);
}
} else {
int watchdogCounter = 200; // roughly 20 seconds
while (!Modes.exit) {
struct timespec start_time;
lockReader();
// reader 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;
struct mag_buf *buf = NULL;
if (Modes.first_free_buffer != Modes.first_filled_buffer) {
// FIFO is not empty, process one buffer.
buf = &Modes.mag_buffers[Modes.first_filled_buffer];
} else {
buf = NULL;
}
unlockReader();
if (buf) {
start_cpu_timing(&start_time);
demodulate2400(buf);
if (Modes.mode_ac) {
demodulate2400AC(buf);
}
gainStatistics(buf);
timingStatistics(buf);
Modes.stats_current.samples_lost += Modes.sdr_buf_samples - buf->length;
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.
lockReader();
Modes.first_filled_buffer = (Modes.first_filled_buffer + 1) % MODES_MAG_BUFFERS;
pthread_cond_signal(&Threads.reader.cond);
unlockReader();
watchdogCounter = 100; // roughly 10 seconds
} else {
// Nothing to process this time around.
if (--watchdogCounter <= 0) {
fprintf(stderr, "<3>SDR wedged, exiting! (check power supply / avoid using an USB extension / SDR might be defective)\n");
setExit(2);
break;
}
}
start_cpu_timing(&start_time);
now = mstime();
backgroundTasks(now);
end_cpu_timing(&start_time, &Modes.stats_current.background_cpu);
lockReader();
int newData = (Modes.first_free_buffer != Modes.first_filled_buffer);
unlockReader();