dump1090.h

// Part of dump1090, a Mode S message decoder for RTLSDR devices.
//
// dump1090.h: main program header
//
// Copyright (c) 2014,2015 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.

#ifndef __DUMP1090_H
#define __DUMP1090_H

// Default version number, if not overriden by the Makefile
#ifndef MODES_DUMP1090_VERSION
# define MODES_DUMP1090_VERSION     "v1.13-custom"
#endif

#ifndef MODES_DUMP1090_VARIANT
# define MODES_DUMP1090_VARIANT     "dump1090-mutability"
#endif

// ============================= Include files ==========================

#ifndef _WIN32
    #include <stdio.h>
    #include <string.h>
    #include <stdlib.h>
    #include <pthread.h>
    #include <stdint.h>
    #include <errno.h>
    #include <unistd.h>
    #include <math.h>
    #include <sys/time.h>
    #include <signal.h>
    #include <fcntl.h>
    #include <ctype.h>
    #include <sys/stat.h>
    #include <sys/ioctl.h>
    #include <time.h>
    #include <limits.h>
#else
    #include "winstubs.h" //Put everything Windows specific in here
#endif

// Avoid a dependency on rtl-sdr except where it's really needed.
typedef struct rtlsdr_dev rtlsdr_dev_t;

// ============================= #defines ===============================

#define MODES_DEFAULT_PPM          52
#define MODES_DEFAULT_RATE         2000000
#define MODES_OVERSAMPLE_RATE      2400000
#define MODES_DEFAULT_FREQ         1090000000
#define MODES_DEFAULT_WIDTH        1000
#define MODES_DEFAULT_HEIGHT       700
#define MODES_RTL_BUFFERS          15                         // Number of RTL buffers
#define MODES_RTL_BUF_SIZE         (16*16384)                 // 256k
#define MODES_MAG_BUF_SAMPLES      (MODES_RTL_BUF_SIZE / 2)   // Each sample is 2 bytes
#define MODES_MAG_BUFFERS          12                         // Number of magnitude buffers (should be smaller than RTL_BUFFERS for flowcontrol to work)
#define MODES_AUTO_GAIN            -100                       // Use automatic gain
#define MODES_MAX_GAIN             999999                     // Use max available gain
#define MODES_MSG_SQUELCH_DB       4.0                        // Minimum SNR, in dB
#define MODES_MSG_ENCODER_ERRS     3                          // Maximum number of encoding errors

#define MODES_MAX_PHASE_STATS      10

#define MODEAC_MSG_SAMPLES       (25 * 2)                     // include up to the SPI bit
#define MODEAC_MSG_BYTES          2
#define MODEAC_MSG_SQUELCH_LEVEL  0x07FF                      // Average signal strength limit
#define MODEAC_MSG_FLAG          (1<<0)
#define MODEAC_MSG_MODES_HIT     (1<<1)
#define MODEAC_MSG_MODEA_HIT     (1<<2)
#define MODEAC_MSG_MODEC_HIT     (1<<3)
#define MODEAC_MSG_MODEA_ONLY    (1<<4)
#define MODEAC_MSG_MODEC_OLD     (1<<5)

#define MODES_PREAMBLE_US        8              // microseconds = bits
#define MODES_PREAMBLE_SAMPLES  (MODES_PREAMBLE_US       * 2)
#define MODES_PREAMBLE_SIZE     (MODES_PREAMBLE_SAMPLES  * sizeof(uint16_t))
#define MODES_LONG_MSG_BYTES     14
#define MODES_SHORT_MSG_BYTES    7
#define MODES_LONG_MSG_BITS     (MODES_LONG_MSG_BYTES    * 8)
#define MODES_SHORT_MSG_BITS    (MODES_SHORT_MSG_BYTES   * 8)
#define MODES_LONG_MSG_SAMPLES  (MODES_LONG_MSG_BITS     * 2)
#define MODES_SHORT_MSG_SAMPLES (MODES_SHORT_MSG_BITS    * 2)
#define MODES_LONG_MSG_SIZE     (MODES_LONG_MSG_SAMPLES  * sizeof(uint16_t))
#define MODES_SHORT_MSG_SIZE    (MODES_SHORT_MSG_SAMPLES * sizeof(uint16_t))

#define MODES_OS_PREAMBLE_SAMPLES  (20)
#define MODES_OS_PREAMBLE_SIZE     (MODES_OS_PREAMBLE_SAMPLES  * sizeof(uint16_t))
#define MODES_OS_LONG_MSG_SAMPLES  (268)
#define MODES_OS_SHORT_MSG_SAMPLES (135)
#define MODES_OS_LONG_MSG_SIZE     (MODES_LONG_MSG_SAMPLES  * sizeof(uint16_t))
#define MODES_OS_SHORT_MSG_SIZE    (MODES_SHORT_MSG_SAMPLES * sizeof(uint16_t))

#define MODES_OUT_BUF_SIZE         (1500)
#define MODES_OUT_FLUSH_SIZE       (MODES_OUT_BUF_SIZE - 256)
#define MODES_OUT_FLUSH_INTERVAL   (60000)

#define MODES_UNIT_FEET 0
#define MODES_UNIT_METERS 1

#define MODES_USER_LATLON_VALID (1<<0)

#define MODES_ACFLAGS_LATLON_VALID   (1<<0)  // Aircraft Lat/Lon is decoded
#define MODES_ACFLAGS_ALTITUDE_VALID (1<<1)  // Aircraft altitude is known
#define MODES_ACFLAGS_HEADING_VALID  (1<<2)  // Aircraft heading is known
#define MODES_ACFLAGS_SPEED_VALID    (1<<3)  // Aircraft speed is known
#define MODES_ACFLAGS_VERTRATE_VALID (1<<4)  // Aircraft vertical rate is known
#define MODES_ACFLAGS_SQUAWK_VALID   (1<<5)  // Aircraft Mode A Squawk is known
#define MODES_ACFLAGS_CALLSIGN_VALID (1<<6)  // Aircraft Callsign Identity
#define MODES_ACFLAGS_EWSPEED_VALID  (1<<7)  // Aircraft East West Speed is known
#define MODES_ACFLAGS_NSSPEED_VALID  (1<<8)  // Aircraft North South Speed is known
#define MODES_ACFLAGS_AOG            (1<<9)  // Aircraft is On the Ground
#define MODES_ACFLAGS_LLEVEN_VALID   (1<<10) // Aircraft Even Lot/Lon is known
#define MODES_ACFLAGS_LLODD_VALID    (1<<11) // Aircraft Odd Lot/Lon is known
#define MODES_ACFLAGS_AOG_VALID      (1<<12) // MODES_ACFLAGS_AOG is valid
#define MODES_ACFLAGS_FS_VALID       (1<<13) // Aircraft Flight Status is known
#define MODES_ACFLAGS_NSEWSPD_VALID  (1<<14) // Aircraft EW and NS Speed is known
#define MODES_ACFLAGS_LATLON_REL_OK  (1<<15) // Indicates it's OK to do a relative CPR
#define MODES_ACFLAGS_REL_CPR_USED   (1<<16) // Lat/lon derived from relative CPR
#define MODES_ACFLAGS_CATEGORY_VALID (1<<17) // Aircraft category is known
#define MODES_ACFLAGS_FROM_MLAT      (1<<18) // Data was derived from multilateration

#define MODES_ACFLAGS_LLEITHER_VALID (MODES_ACFLAGS_LLEVEN_VALID | MODES_ACFLAGS_LLODD_VALID)
#define MODES_ACFLAGS_LLBOTH_VALID   (MODES_ACFLAGS_LLEVEN_VALID | MODES_ACFLAGS_LLODD_VALID)
#define MODES_ACFLAGS_AOG_GROUND     (MODES_ACFLAGS_AOG_VALID    | MODES_ACFLAGS_AOG)

#define MODES_NON_ICAO_ADDRESS       (1<<24) // Set on addresses to indicate they are not ICAO addresses

#define MODES_DEBUG_DEMOD (1<<0)
#define MODES_DEBUG_DEMODERR (1<<1)
#define MODES_DEBUG_BADCRC (1<<2)
#define MODES_DEBUG_GOODCRC (1<<3)
#define MODES_DEBUG_NOPREAMBLE (1<<4)
#define MODES_DEBUG_NET (1<<5)
#define MODES_DEBUG_JS (1<<6)

// When debug is set to MODES_DEBUG_NOPREAMBLE, the first sample must be
// at least greater than a given level for us to dump the signal.
#define MODES_DEBUG_NOPREAMBLE_LEVEL 25

#define MODES_INTERACTIVE_REFRESH_TIME 250      // Milliseconds
#define MODES_INTERACTIVE_ROWS          22      // Rows on screen
#define MODES_INTERACTIVE_DISPLAY_TTL 60000     // Delete from display after 60 seconds

#define MODES_NET_HEARTBEAT_INTERVAL 60000      // milliseconds

#define MODES_NET_SERVICES_NUM          7
#define MODES_NET_INPUT_RAW_PORT    30001
#define MODES_NET_OUTPUT_RAW_PORT   30002
#define MODES_NET_OUTPUT_SBS_PORT   30003
#define MODES_NET_INPUT_BEAST_PORT  30004
#define MODES_NET_OUTPUT_BEAST_PORT 30005
#define MODES_NET_HTTP_PORT          8080
#define MODES_NET_OUTPUT_FA_TSV_PORT 10001
#define MODES_CLIENT_BUF_SIZE  1024
#define MODES_NET_SNDBUF_SIZE (1024*64)
#define MODES_NET_SNDBUF_MAX  (7)

#ifndef HTMLPATH
#define HTMLPATH   "./public_html"      // default path for gmap.html etc
#endif

#define HISTORY_SIZE 120
#define HISTORY_INTERVAL 30000

#define MODES_NOTUSED(V) ((void) V)

#define MAX_AMPLITUDE 65535.0
#define MAX_POWER (MAX_AMPLITUDE * MAX_AMPLITUDE)

// Include subheaders after all the #defines are in place

#include "util.h"
#include "anet.h"
#include "net_io.h"
#include "crc.h"
#include "demod_2000.h"
#include "demod_2400.h"
#include "stats.h"
#include "cpr.h"
#include "icao_filter.h"
#include "convert.h"

//======================== structure declarations =========================

// Structure representing one magnitude buffer
struct mag_buf {
    uint16_t       *data;            // Magnitude data. Starts with Modes.trailing_samples worth of overlap from the previous block
    unsigned        length;          // Number of valid samples _after_ overlap. Total buffer length is buf->length + Modes.trailing_samples.
    uint64_t        sampleTimestamp; // Clock timestamp of the start of this block, 12MHz clock
    struct timespec sysTimestamp;    // Estimated system time at start of block
    uint32_t        dropped;         // Number of dropped samples preceding this buffer
    double          total_power;     // Sum of per-sample input power (in the range [0.0,1.0] per sample), or 0 if not measured
};

// Program global state
struct {                             // Internal state
    pthread_t       reader_thread;

    pthread_mutex_t data_mutex;      // Mutex to synchronize buffer access
    pthread_cond_t  data_cond;       // Conditional variable associated

    struct mag_buf  mag_buffers[MODES_MAG_BUFFERS];       // Converted magnitude buffers from RTL or file input
    unsigned        first_free_buffer;                    // Entry in mag_buffers that will next be filled with input.
    unsigned        first_filled_buffer;                  // Entry in mag_buffers that has valid data and will be demodulated next. If equal to next_free_buffer, there is no unprocessed data.
    struct timespec reader_cpu_accumulator;               // CPU time used by the reader thread, copied out and reset by the main thread under the mutex

    unsigned        trailing_samples;                     // extra trailing samples in magnitude buffers
    double          sample_rate;                          // actual sample rate in use (in hz)

    int             fd;              // --ifile option file descriptor
    input_format_t  input_format;    // --iformat option
    uint16_t       *maglut;          // I/Q -> Magnitude lookup table
    uint16_t       *log10lut;        // Magnitude -> log10 lookup table
    int             exit;            // Exit from the main loop when true

    // Sample conversion
    int            dc_filter;        // should we apply a DC filter?
    int            measure_noise;    // should we measure noise power?
    iq_convert_fn  converter_function;
    struct converter_state *converter_state;

    // RTLSDR
    char *        dev_name;
    int           gain;
    int           enable_agc;
    rtlsdr_dev_t *dev;
    int           freq;
    int           ppm_error;

    // Networking
    char           aneterr[ANET_ERR_LEN];
    struct net_service *services;    // Active services
    struct client *clients;          // Our clients

    struct net_writer raw_out;       // Raw output
    struct net_writer beast_out;     // Beast-format output
    struct net_writer sbs_out;       // SBS-format output
    struct net_writer fatsv_out;     // FATSV-format output

#ifdef _WIN32
    WSADATA        wsaData;          // Windows socket initialisation
#endif

    // Configuration
    char *filename;                  // Input form file, --ifile option
    int   oversample;
    int   phase_enhance;             // Enable phase enhancement if true
    int   nfix_crc;                  // Number of crc bit error(s) to correct
    int   check_crc;                 // Only display messages with good CRC
    int   raw;                       // Raw output format
    int   beast;                     // Beast binary format output
    int   mode_ac;                   // Enable decoding of SSR Modes A & C
    int   debug;                     // Debugging mode
    int   net;                       // Enable networking
    int   net_only;                  // Enable just networking
    uint64_t net_heartbeat_interval; // TCP heartbeat interval (milliseconds)
    int   net_output_sbs_port;       // SBS output TCP port
    int   net_output_flush_size;     // Minimum Size of output data
    uint64_t net_output_flush_interval; // Maximum interval (in milliseconds) between outputwrites
    int   net_output_raw_port;       // Raw output TCP port
    int   net_input_raw_port;        // Raw input TCP port
    int   net_output_beast_port;     // Beast output TCP port
    int   net_input_beast_port;      // Beast input TCP port
    char  *net_bind_address;         // Bind address
    int   net_http_port;             // HTTP port
    int   net_fatsv_port;            // FlightAware TSV port
    int   net_sndbuf_size;           // TCP output buffer size (64Kb * 2^n)
    int   net_verbatim;              // if true, send the original message, not the CRC-corrected one
    int   forward_mlat;              // allow forwarding of mlat messages to output ports
    int   quiet;                     // Suppress stdout
    uint32_t show_only;              // Only show messages from this ICAO
    int   interactive;               // Interactive mode
    int   interactive_rows;          // Interactive mode: max number of rows
    uint64_t interactive_display_ttl;// Interactive mode: TTL display
    uint64_t stats;                  // Interval (millis) between stats dumps,
    int   stats_range_histo;         // Collect/show a range histogram?
    int   onlyaddr;                  // Print only ICAO addresses
    int   metric;                    // Use metric units
    int   mlat;                      // Use Beast ascii format for raw data output, i.e. @...; iso *...;
    int   interactive_rtl1090;       // flight table in interactive mode is formatted like RTL1090
    char *json_dir;                  // Path to json base directory, or NULL not to write json.
    uint64_t json_interval;          // Interval between rewriting the json aircraft file, in milliseconds; also the advertised map refresh interval
    int   json_location_accuracy;    // Accuracy of location metadata: 0=none, 1=approx, 2=exact
    int   throttle;                  // When reading from a file, throttle file playback to realtime?

    int   json_aircraft_history_next;
    struct {
        char *content;
        int clen;
    } json_aircraft_history[HISTORY_SIZE];

    // User details
    double fUserLat;                // Users receiver/antenna lat/lon needed for initial surface location
    double fUserLon;                // Users receiver/antenna lat/lon needed for initial surface location
    int    bUserFlags;              // Flags relating to the user details
    double maxRange;                // Absolute maximum decoding range, in *metres*

    // State tracking
    struct aircraft *aircrafts;

    // Statistics
    struct stats stats_current;
    struct stats stats_alltime;
    struct stats stats_periodic;
    struct stats stats_1min[15];
    int stats_latest_1min;
    struct stats stats_5min;
    struct stats stats_15min;
} Modes;

// The struct we use to store information about a decoded message.
struct modesMessage {
    // Generic fields
    unsigned char msg[MODES_LONG_MSG_BYTES];      // Binary message.
    unsigned char verbatim[MODES_LONG_MSG_BYTES]; // Binary message, as originally received before correction
    int           msgbits;                        // Number of bits in message 
    int           msgtype;                        // Downlink format #
    uint32_t      crc;                            // Message CRC
    int           correctedbits;                  // No. of bits corrected 
    uint32_t      addr;                           // Address Announced
    uint64_t      timestampMsg;                   // Timestamp of the message (12MHz clock)
    struct timespec sysTimestampMsg;              // Timestamp of the message (system time)
    int           remote;                         // If set this message is from a remote station
    double        signalLevel;                    // RSSI, in the range [0..1], as a fraction of full-scale power
    int           score;                          // Scoring from scoreModesMessage, if used

    // DF 11, DF 17
    int  ca;                    // Responder capabilities
    int  iid;

    // DF 17, DF 18
    int    metype;              // Extended squitter message type.
    int    mesub;               // Extended squitter message subtype.
    int    heading;             // Reported by aircraft, or computed from from EW and NS velocity
    int    raw_latitude;        // Non decoded latitude.
    int    raw_longitude;       // Non decoded longitude.
    unsigned nuc_p;             // NUCp value implied by message type
    double fLat;                // Coordinates obtained from CPR encoded data if/when decoded
    double fLon;                // Coordinates obtained from CPR encoded data if/when decoded
    char   flight[16];          // 8 chars flight number.
    int    ew_velocity;         // E/W velocity.
    int    ns_velocity;         // N/S velocity.
    int    vert_rate;           // Vertical rate.
    int    velocity;            // Reported by aircraft, or computed from from EW and NS velocity
    unsigned category;          // A0 - D7 encoded as a single hex byte

    // DF 18
    int    cf;                  // Control Field

    // DF4, DF5, DF20, DF21
    int  fs;                    // Flight status for DF4,5,20,21
    int  modeA;                 // 13 bits identity (Squawk).

    // DF20, DF21
    int  bds;                   // BDS value implied if overlay control was used

    // Fields used by multiple message types.
    int  altitude;
    int  unit; 
    int  bFlags;                // Flags related to fields in this structure
};

// This one needs modesMessage:
#include "track.h"

// ======================== function declarations =========================

#ifdef __cplusplus
extern "C" {
#endif

//
// Functions exported from mode_ac.c
//
int  detectModeA       (uint16_t *m, struct modesMessage *mm);
void decodeModeAMessage(struct modesMessage *mm, int ModeA);
int  ModeAToModeC      (unsigned int ModeA);

//
// Functions exported from mode_s.c
//
int modesMessageLenByType(int type);
int scoreModesMessage(unsigned char *msg, int validbits);
int decodeModesMessage (struct modesMessage *mm, unsigned char *msg);
void displayModesMessage(struct modesMessage *mm);
void useModesMessage    (struct modesMessage *mm);
//
// Functions exported from interactive.c
//
void  interactiveShowData(void);

#ifdef __cplusplus
}
#endif

#endif // __DUMP1090_H