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dump1090-wrapper.c
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dump1090-wrapper.c
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// dump1090, a Mode S messages decoder for RTLSDR devices.
//
// 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 "coaa.h"
#include "dump1090.h"
struct ProgramState Modes;
//
// ============================= Utility functions ==========================
//
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
}
//
// =============================== Terminal handling ========================
//
#ifndef _WIN32
// Get the number of rows after the terminal changes size.
int getTermRows()
{
struct winsize w;
ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
return (w.ws_row);
}
// Handle resizing terminal
void sigWinchCallback()
{
signal(SIGWINCH, SIG_IGN);
Modes.interactive_rows = getTermRows();
interactiveShowData();
signal(SIGWINCH, sigWinchCallback);
}
#else
int getTermRows()
{
return MODES_INTERACTIVE_ROWS;
}
#endif
//
// =============================== 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.ppm_error = MODES_DEFAULT_PPM;
Modes.check_crc = 1;
Modes.net_heartbeat_rate = MODES_NET_HEARTBEAT_RATE;
Modes.net_output_sbs_port = MODES_NET_OUTPUT_SBS_PORT;
Modes.net_output_raw_port = MODES_NET_OUTPUT_RAW_PORT;
Modes.net_input_raw_port = MODES_NET_INPUT_RAW_PORT;
Modes.net_output_beast_port = MODES_NET_OUTPUT_BEAST_PORT;
Modes.net_input_beast_port = MODES_NET_INPUT_BEAST_PORT;
Modes.net_http_port = MODES_NET_HTTP_PORT;
Modes.interactive_rows = getTermRows();
Modes.interactive_delete_ttl = MODES_INTERACTIVE_DELETE_TTL;
Modes.interactive_display_ttl = MODES_INTERACTIVE_DISPLAY_TTL;
Modes.fUserLat = MODES_USER_LATITUDE_DFLT;
Modes.fUserLon = MODES_USER_LONGITUDE_DFLT;
}
//
//=========================================================================
//
int modesInit(void)
{
int i, q;
pthread_mutex_init(&Modes.pDF_mutex, NULL);
pthread_mutex_init(&Modes.data_mutex, NULL);
pthread_cond_init(&Modes.data_cond, NULL);
// Allocate the various buffers used by Modes
if (((Modes.icao_cache = (uint32_t*)malloc(sizeof(uint32_t) * MODES_ICAO_CACHE_LEN * 2)) == NULL)
|| ((Modes.pFileData = (uint16_t*)malloc(MODES_ASYNC_BUF_SIZE)) == NULL)
|| ((Modes.magnitude = (uint16_t*)malloc(MODES_ASYNC_BUF_SIZE + MODES_PREAMBLE_SIZE + MODES_LONG_MSG_SIZE)) == NULL)
|| ((Modes.maglut = (uint16_t*)malloc(sizeof(uint16_t) * 256 * 256)) == NULL)
|| ((Modes.beastOut = (char*)malloc(MODES_RAWOUT_BUF_SIZE)) == NULL)
|| ((Modes.rawOut = (char*)malloc(MODES_RAWOUT_BUF_SIZE)) == NULL))
{
fprintf(stderr, "Out of memory allocating data buffer.\n");
return -1;
}
// Clear the buffers that have just been allocated, just in-case
memset(Modes.icao_cache, 0, sizeof(uint32_t) * MODES_ICAO_CACHE_LEN * 2);
memset(Modes.pFileData, 127, MODES_ASYNC_BUF_SIZE);
memset(Modes.magnitude, 0, MODES_ASYNC_BUF_SIZE + MODES_PREAMBLE_SIZE + MODES_LONG_MSG_SIZE);
// 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_raw_size > (MODES_RAWOUT_BUF_FLUSH)) { Modes.net_output_raw_size = MODES_RAWOUT_BUF_FLUSH; }
if (Modes.net_output_raw_rate > (MODES_RAWOUT_BUF_RATE)) { Modes.net_output_raw_rate = MODES_RAWOUT_BUF_RATE; }
if (Modes.net_sndbuf_size > (MODES_NET_SNDBUF_MAX)) { Modes.net_sndbuf_size = MODES_NET_SNDBUF_MAX; }
// Each I and Q value varies from 0 to 255, which represents a range from -1 to +1. To get from the
// unsigned (0-255) range you therefore subtract 127 (or 128 or 127.5) from each I and Q, giving you
// a range from -127 to +128 (or -128 to +127, or -127.5 to +127.5)..
//
// To decode the AM signal, you need the magnitude of the waveform, which is given by sqrt((I^2)+(Q^2))
// The most this could be is if I&Q are both 128 (or 127 or 127.5), so you could end up with a magnitude
// of 181.019 (or 179.605, or 180.312)
//
// However, in reality the magnitude of the signal should never exceed the range -1 to +1, because the
// values are I = rCos(w) and Q = rSin(w). Therefore the integer computed magnitude should (can?) never
// exceed 128 (or 127, or 127.5 or whatever)
//
// If we scale up the results so that they range from 0 to 65535 (16 bits) then we need to multiply
// by 511.99, (or 516.02 or 514). antirez's original code multiplies by 360, presumably because he's
// assuming the maximim calculated amplitude is 181.019, and (181.019 * 360) = 65166.
//
// So lets see if we can improve things by subtracting 127.5, Well in integer arithmatic we can't
// subtract half, so, we'll double everything up and subtract one, and then compensate for the doubling
// in the multiplier at the end.
//
// If we do this we can never have I or Q equal to 0 - they can only be as small as +/- 1.
// This gives us a minimum magnitude of root 2 (0.707), so the dynamic range becomes (1.414-255). This
// also affects our scaling value, which is now 65535/(255 - 1.414), or 258.433254
//
// The sums then become mag = 258.433254 * (sqrt((I*2-255)^2 + (Q*2-255)^2) - 1.414)
// or mag = (258.433254 * sqrt((I*2-255)^2 + (Q*2-255)^2)) - 365.4798
//
// We also need to clip mag just incaes any rogue I/Q values somehow do have a magnitude greater than 255.
//
for (i = 0; i <= 255; i++)
{
for (q = 0; q <= 255; q++)
{
int mag, mag_i, mag_q;
mag_i = (i * 2) - 255;
mag_q = (q * 2) - 255;
mag = (int)round((sqrt((mag_i * mag_i) + (mag_q * mag_q)) * 258.433254) - 365.4798);
Modes.maglut[(i * 256) + q] = (uint16_t)((mag < 65535) ? mag : 65535);
}
}
// Prepare error correction tables
modesInitErrorInfo();
return 0;
}
//
// =============================== RTLSDR handling ==========================
//
int modesInitRTLSDR(void)
{
int j;
int device_count;
char vendor[256], product[256], serial[256];
device_count = rtlsdr_get_device_count();
if (!device_count)
{
fprintf(stderr, "No supported RTLSDR devices found.\n");
return -1;
// return -1;
}
fprintf(stderr, "Found %d device(s):\n", device_count);
for (j = 0; j < device_count; j++)
{
rtlsdr_get_device_usb_strings(j, vendor, product, serial);
fprintf(stderr, "%d: %s, %s, SN: %s %s\n", j, vendor, product, serial, (j == Modes.dev_index) ? "(currently selected)" : "");
}
if (rtlsdr_open(&Modes.dev, Modes.dev_index) < 0)
{
fprintf(stderr, "Error opening the RTLSDR device: %s\n", strerror(errno));
return -1;
}
// Set gain, frequency, sample rate, and reset the device
rtlsdr_set_tuner_gain_mode(Modes.dev, (Modes.gain == MODES_AUTO_GAIN) ? 0 : 1);
if (Modes.gain != MODES_AUTO_GAIN)
{
if (Modes.gain == MODES_MAX_GAIN)
{
// Find the maximum gain available
int numgains;
int gains[100];
numgains = rtlsdr_get_tuner_gains(Modes.dev, gains);
Modes.gain = gains[numgains - 1];
fprintf(stderr, "Max available gain is: %.2f\n", Modes.gain / 10.0);
}
rtlsdr_set_tuner_gain(Modes.dev, Modes.gain);
fprintf(stderr, "Setting gain to: %.2f\n", Modes.gain / 10.0);
}
else { fprintf(stderr, "Using automatic gain control.\n"); }
rtlsdr_set_freq_correction(Modes.dev, Modes.ppm_error);
if (Modes.enable_agc) rtlsdr_set_agc_mode(Modes.dev, 1);
rtlsdr_set_center_freq(Modes.dev, Modes.freq);
rtlsdr_set_sample_rate(Modes.dev, MODES_DEFAULT_RATE);
rtlsdr_reset_buffer(Modes.dev);
fprintf(stderr, "Gain reported by device: %.2f\n", rtlsdr_get_tuner_gain(Modes.dev) / 10.0);
return 0;
}
//
//=========================================================================
//
// 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.
//
void rtlsdrCallback(unsigned char* buf, uint32_t len, void* ctx)
{
MODES_NOTUSED(ctx);
// Lock the data buffer variables before accessing them
pthread_mutex_lock(&Modes.data_mutex);
Modes.iDataIn &= (MODES_ASYNC_BUF_NUMBER - 1); // Just incase!!!
if (len > MODES_ASYNC_BUF_SIZE) { len = MODES_ASYNC_BUF_SIZE; }
// Queue the new data
Modes.pData[Modes.iDataIn] = (uint16_t*)buf;
Modes.iDataIn = (MODES_ASYNC_BUF_NUMBER - 1) & (Modes.iDataIn + 1);
Modes.iDataReady = (MODES_ASYNC_BUF_NUMBER - 1) & (Modes.iDataIn - Modes.iDataOut);
if (Modes.iDataReady == 0)
{
// Ooooops. We've just received the MODES_ASYNC_BUF_NUMBER'th outstanding buffer
// This means that RTLSDR is currently overwriting the MODES_ASYNC_BUF_NUMBER+1
// buffer, but we havent yet processed it, so we're going to lose it. There
// isn't much we can do to recover the lost data, but we can correct things to
// avoid any additional problems.
Modes.iDataOut = (MODES_ASYNC_BUF_NUMBER - 1) & (Modes.iDataOut + 1);
Modes.iDataReady = (MODES_ASYNC_BUF_NUMBER - 1);
Modes.iDataLost++;
}
// Signal to the other thread that new data is ready, and unlock
pthread_cond_signal(&Modes.data_cond);
pthread_mutex_unlock(&Modes.data_mutex);
}
//
//=========================================================================
//
// This is used when --ifile is specified in order to read data from file
// instead of using an RTLSDR device
//
void readDataFromFile(void)
{
pthread_mutex_lock(&Modes.data_mutex);
while (Modes.exit == 0)
{
ssize_t nread, toread;
unsigned char* p;
if (Modes.iDataReady)
{
pthread_cond_wait(&Modes.data_cond, &Modes.data_mutex);
continue;
}
if (Modes.interactive)
{
// When --ifile and --interactive are used together, slow down
// playing at the natural rate of the RTLSDR received.
pthread_mutex_unlock(&Modes.data_mutex);
usleep(64000);
pthread_mutex_lock(&Modes.data_mutex);
}
toread = MODES_ASYNC_BUF_SIZE;
p = (unsigned char*)Modes.pFileData;
while (toread)
{
nread = read(Modes.fd, p, toread);
if (nread <= 0)
{
Modes.exit = 1; // Signal the other threads to exit.
break;
}
p += nread;
toread -= nread;
}
if (toread)
{
// Not enough data on file to fill the buffer? Pad with no signal.
memset(p, 127, toread);
}
Modes.iDataIn &= (MODES_ASYNC_BUF_NUMBER - 1); // Just incase!!!
// Queue the new data
Modes.pData[Modes.iDataIn] = Modes.pFileData;
Modes.iDataIn = (MODES_ASYNC_BUF_NUMBER - 1) & (Modes.iDataIn + 1);
Modes.iDataReady = (MODES_ASYNC_BUF_NUMBER - 1) & (Modes.iDataIn - Modes.iDataOut);
// Signal to the other thread that new data is ready
pthread_cond_signal(&Modes.data_cond);
}
}
//
//=========================================================================
//
// 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);
if (Modes.filename == NULL) { rtlsdr_read_async(Modes.dev, rtlsdrCallback, NULL, MODES_ASYNC_BUF_NUMBER, MODES_ASYNC_BUF_SIZE); }
else { readDataFromFile(); }
// Signal to the other thread that new data is ready - dummy really so threads don't mutually lock
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 Ver : " MODES_DUMP1090_VERSION " |\n"
"-----------------------------------------------------------------------------\n"
"--device-index <index> Select RTL device (default: 0)\n"
"--gain <db> Set gain (default: max gain. Use -10 for auto-gain)\n"
"--enable-agc Enable the Automatic Gain Control (default: off)\n"
"--freq <hz> Set frequency (default: 1090 Mhz)\n"
"--ifile <filename> Read data from file (use '-' for stdin)\n"
"--interactive Interactive mode refreshing data on screen\n"
"--interactive-rows <num> Max number of rows in interactive mode (default: 15)\n"
"--interactive-ttl <sec> Remove from list if idle for <sec> (default: 60)\n"
"--interactive-rtl1090 Display flight table in RTL1090 format\n"
"--raw Show only messages hex values\n"
"--net Enable networking\n"
"--modeac Enable decoding of SSR Modes 3/A & 3/C\n"
"--net-beast TCP raw output in Beast binary format\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-http-port <port> HTTP server port (default: 8080)\n"
"--net-ri-port <port> TCP raw input listen port (default: 30001)\n"
"--net-ro-port <port> TCP raw output listen port (default: 30002)\n"
"--net-sbs-port <port> TCP BaseStation output listen port (default: 30003)\n"
"--net-bi-port <port> TCP Beast input listen port (default: 30004)\n"
"--net-bo-port <port> TCP Beast output listen port (default: 30005)\n"
"--net-ro-size <size> TCP raw output minimum size (default: 0)\n"
"--net-ro-rate <rate> TCP raw output memory flush rate (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"
"--lat <latitude> Reference/receiver latitude for surface posn (opt)\n"
"--lon <longitude> Reference/receiver longitude for surface posn (opt)\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"
"--phase-enhance Enable phase enhancement\n"
"--aggressive More CPU for more messages (two bits fixes, ...)\n"
"--mlat display raw messages in Beast ascii mode\n"
"--stats With --ifile print stats at exit. No other output\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"
"--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"
"--ppm <error> Set receiver error in parts per million (default 0)\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");
}
#ifdef _WIN32
void showCopyright(void)
{
uint64_t llTime = time(NULL) + 1;
printf("-----------------------------------------------------------------------------\n"
"| dump1090 ModeS Receiver Ver : " MODES_DUMP1090_VERSION " |\n"
"-----------------------------------------------------------------------------\n"
"\n"
" Copyright (C) 2012 by Salvatore Sanfilippo <antirez@gmail.com>\n"
" Copyright (C) 2014 by Malcolm Robb <support@attavionics.com>\n"
"\n"
" All rights reserved.\n"
"\n"
" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n"
" "
"AS IS"
" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n"
" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n"
" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n"
" HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n"
" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n"
" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n"
" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n"
" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n"
" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n"
" OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n"
"\n"
" For further details refer to <https://github.com/MalcolmRobb/dump1090>\n"
"\n");
// delay for 1 second to give the user a chance to read the copyright
while (llTime >= time(NULL)) {}
}
#endif
static void display_stats(void)
{
int j;
time_t now = time(NULL);
printf("\n\n");
// if (Modes.interactive) interactiveShowData();
printf("Statistics as at %s", ctime(&now));
printf("%d sample blocks processed\n", Modes.stat_blocks_processed);
printf("%d sample blocks dropped\n", Modes.stat_blocks_dropped);
printf("%d ModeA/C detected\n", Modes.stat_ModeAC);
printf("%d valid Mode-S preambles\n", Modes.stat_valid_preamble);
printf("%d DF-?? fields corrected for length\n", Modes.stat_DF_Len_Corrected);
printf("%d DF-?? fields corrected for type\n", Modes.stat_DF_Type_Corrected);
printf("%d demodulated with 0 errors\n", Modes.stat_demodulated0);
printf("%d demodulated with 1 error\n", Modes.stat_demodulated1);
printf("%d demodulated with 2 errors\n", Modes.stat_demodulated2);
printf("%d demodulated with > 2 errors\n", Modes.stat_demodulated3);
printf("%d with good crc\n", Modes.stat_goodcrc);
printf("%d with bad crc\n", Modes.stat_badcrc);
printf("%d errors corrected\n", Modes.stat_fixed);
for (j = 0; j < MODES_MAX_BITERRORS; j++)
{
printf(" %d with %d bit %s\n", Modes.stat_bit_fix[j], j + 1, (j == 0) ? "error" : "errors");
}
if (Modes.phase_enhance)
{
printf("%d phase enhancement attempts\n", Modes.stat_out_of_phase);
printf("%d phase enhanced demodulated with 0 errors\n", Modes.stat_ph_demodulated0);
printf("%d phase enhanced demodulated with 1 error\n", Modes.stat_ph_demodulated1);
printf("%d phase enhanced demodulated with 2 errors\n", Modes.stat_ph_demodulated2);
printf("%d phase enhanced demodulated with > 2 errors\n", Modes.stat_ph_demodulated3);
printf("%d phase enhanced with good crc\n", Modes.stat_ph_goodcrc);
printf("%d phase enhanced with bad crc\n", Modes.stat_ph_badcrc);
printf("%d phase enhanced errors corrected\n", Modes.stat_ph_fixed);
for (j = 0; j < MODES_MAX_BITERRORS; j++)
{
printf(" %d with %d bit %s\n", Modes.stat_ph_bit_fix[j], j + 1, (j == 0) ? "error" : "errors");
}
}
printf("%d total usable messages\n", Modes.stat_goodcrc + Modes.stat_ph_goodcrc + Modes.stat_fixed + Modes.stat_ph_fixed);
fflush(stdout);
Modes.stat_blocks_processed = Modes.stat_blocks_dropped = 0;
Modes.stat_ModeAC = Modes.stat_valid_preamble = Modes.stat_DF_Len_Corrected = Modes.stat_DF_Type_Corrected = Modes.stat_demodulated0
= Modes.stat_demodulated1 = Modes.stat_demodulated2 = Modes.stat_demodulated3 = Modes.stat_goodcrc = Modes.stat_badcrc
= Modes.stat_fixed = 0;
Modes.stat_out_of_phase = Modes.stat_ph_demodulated0 = Modes.stat_ph_demodulated1 = Modes.stat_ph_demodulated2
= Modes.stat_ph_demodulated3 = Modes.stat_ph_goodcrc = Modes.stat_ph_badcrc = Modes.stat_ph_fixed = 0;
for (j = 0; j < MODES_MAX_BITERRORS; j++)
{
Modes.stat_ph_bit_fix[j] = 0;
Modes.stat_bit_fix[j] = 0;
}
}
//
//=========================================================================
//
// 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 time_t next_stats;
if (Modes.net)
{
// modesReadFromClients();
}
// If Modes.aircrafts is not NULL, remove any stale aircraft
if (Modes.aircrafts)
{
// interactiveRemoveStaleAircrafts();
}
// Refresh screen when in interactive mode
if (Modes.interactive)
{
// interactiveShowData();
}
if (Modes.stats > 0)
{
time_t now = time(NULL);
if (now > next_stats)
{
if (next_stats != 0) display_stats();
next_stats = now + Modes.stats;
}
}
}
//
//=========================================================================
//
int verbose_device_search(char* s)
{
int i, device_count, device, offset;
char* s2;
char vendor[256], product[256], serial[256];
device_count = rtlsdr_get_device_count();
if (!device_count)
{
fprintf(stderr, "No supported devices found.\n");
return -1;
}
fprintf(stderr, "Found %d device(s):\n", device_count);
for (i = 0; i < device_count; i++)
{
if (rtlsdr_get_device_usb_strings(i, vendor, product, serial) < 0)
{
fprintf(stderr, "Error Fetching device information for Device: %d", i);
}
else { fprintf(stderr, " %d: %s, %s, SN: %s\n", i, vendor, product, serial); }
}
fprintf(stderr, "\n");
/* does string look like raw id number */
device = (int)strtol(s, &s2, 0);
if (s2[0] == '\0' && device >= 0 && device < device_count)
{
fprintf(stderr, "Using device %d: %s\n", device, rtlsdr_get_device_name((uint32_t)device));
return device;
}
/* does string exact match a serial */
for (i = 0; i < device_count; i++)
{
rtlsdr_get_device_usb_strings(i, vendor, product, serial);
if (strcmp(s, serial) != 0) { continue; }
device = i;
fprintf(stderr, "Using device %d: %s\n", device, rtlsdr_get_device_name((uint32_t)device));
return device;
}
/* does string prefix match a serial */
for (i = 0; i < device_count; i++)
{
rtlsdr_get_device_usb_strings(i, vendor, product, serial);
if (strncmp(s, serial, strlen(s)) != 0) { continue; }
device = i;
fprintf(stderr, "Using device %d: %s\n", device, rtlsdr_get_device_name((uint32_t)device));
return device;
}
/* does string suffix match a serial */
for (i = 0; i < device_count; i++)
{
rtlsdr_get_device_usb_strings(i, vendor, product, serial);
offset = strlen(serial) - strlen(s);
if (offset < 0) { continue; }
if (strncmp(s, serial + offset, strlen(s)) != 0) { continue; }
device = i;
fprintf(stderr, "Using device %d: %s\n", device, rtlsdr_get_device_name((uint32_t)device));
return device;
}
fprintf(stderr, "No matching devices found.\n");
return -1;
}
//
//=========================================================================
//
int initlistener(uint32_t index)
{
int j;
// Set sane defaults
modesInitConfig();
// signal(SIGINT, sigintHandler); // Define Ctrl/C handler (exit program)
Modes.dev_index = index;
Modes.net = 1;
#ifdef _WIN32
// Try to comply with the Copyright license conditions for binary distribution
if (!Modes.quiet) { showCopyright(); }
#endif
#ifndef _WIN32
// Setup for SIGWINCH for handling lines
if (Modes.interactive) { signal(SIGWINCH, sigWinchCallback); }
#endif
// Initialization
modesInit();
if (Modes.net_only) { fprintf(stderr, "Net-only mode, no RTL device or file open.\n"); }
else if (Modes.filename == NULL)
{
if (modesInitRTLSDR() != 0) { return -1; }
}
else
{
if (Modes.filename[0] == '-' && Modes.filename[1] == '\0') { Modes.fd = STDIN_FILENO; }
else if ((Modes.fd = open(Modes.filename,
#ifdef _WIN32
(O_RDONLY | O_BINARY)
#else
(O_RDONLY)
#endif
))
== -1)
{
perror("Opening data file");
// return -1;
}
}
// if (Modes.net) modesInitNet();
// If the user specifies --net-only, just run in order to serve network
// clients without reading data from the RTL device
while (Modes.net_only)
{
if (Modes.exit) exit(0); // If we exit net_only nothing further in main()
backgroundTasks();
usleep(100000);
}
return 0;
}
void startlistener(const char* deviceName)
{
// Create the thread that will read the data from the device.
pthread_create(&Modes.reader_thread, NULL, readerThreadEntryPoint, NULL);
pthread_mutex_lock(&Modes.data_mutex);
while (Modes.exit == 0)
{
if (Modes.iDataReady == 0)
{
pthread_cond_wait(&Modes.data_cond, &Modes.data_mutex); // This unlocks Modes.data_mutex, and waits for Modes.data_cond
continue; // Once (Modes.data_cond) occurs, it locks Modes.data_mutex
}
// Modes.data_mutex is Locked, and (Modes.iDataReady != 0)
if (Modes.iDataReady)
{ // Check we have new data, just in case!!
Modes.iDataOut &= (MODES_ASYNC_BUF_NUMBER - 1); // Just incase
// Translate the next lot of I/Q samples into Modes.magnitude
computeMagnitudeVector(Modes.pData[Modes.iDataOut]);
// Update the input buffer pointer queue
Modes.iDataOut = (MODES_ASYNC_BUF_NUMBER - 1) & (Modes.iDataOut + 1);
Modes.iDataReady = (MODES_ASYNC_BUF_NUMBER - 1) & (Modes.iDataIn - Modes.iDataOut);
// If we lost some blocks, correct the timestamp
if (Modes.iDataLost)
{
Modes.timestampBlk += (MODES_ASYNC_BUF_SAMPLES * 6 * Modes.iDataLost);
Modes.stat_blocks_dropped += Modes.iDataLost;
Modes.iDataLost = 0;
}
// It's safe to release the lock now
pthread_cond_signal(&Modes.data_cond);
pthread_mutex_unlock(&Modes.data_mutex);
// Process data after releasing the lock, so that the capturing
// thread can read data while we perform computationally expensive
// stuff at the same time.
detectModeS(Modes.magnitude, MODES_ASYNC_BUF_SAMPLES);
// Update the timestamp ready for the next block
Modes.timestampBlk += (MODES_ASYNC_BUF_SAMPLES * 6);
Modes.stat_blocks_processed++;
}
else
{
pthread_cond_signal(&Modes.data_cond);
pthread_mutex_unlock(&Modes.data_mutex);
}
backgroundTasks();
pthread_mutex_lock(&Modes.data_mutex);
}
// If --stats were given, print statistics
if (Modes.stats) { display_stats(); }
if (Modes.filename == NULL)
{
rtlsdr_cancel_async(Modes.dev); // Cancel rtlsdr_read_async will cause data input thread to terminate cleanly
rtlsdr_close(Modes.dev);
}
pthread_cond_destroy(&Modes.data_cond); // Thread cleanup
pthread_mutex_destroy(&Modes.data_mutex);
pthread_join(Modes.reader_thread, NULL); // Wait on reader thread exit
#ifndef _WIN32
pthread_exit(0);
#else
#endif
}
//
//=========================================================================
//
void stoplistener()
{
Modes.exit = 1;
}