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initial support for using rtl_ais as a library
This is implemented and used in the rtlsdr_pi opencpn plugin The send tcp, and library queues should be combined and code shared the aisdecoder should be encapsulated with a context like rtl_ais to allow for multiple interfaces to work in the same process
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| /* | ||
| * Copyright (C) 2012 by Kyle Keen <[email protected]> | ||
| * | ||
| * This program 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 2 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program 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/>. | ||
| */ | ||
|
|
||
| #include <signal.h> | ||
| #include <string.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <unistd.h> | ||
|
|
||
| typedef void* rtlsdr_dev_t; | ||
| #include "convenience.h" | ||
| #include "rtl_ais.h" | ||
|
|
||
| void usage(void) | ||
| { | ||
| fprintf(stderr, | ||
| "rtl_ais, a simple AIS tuner\n" | ||
| "\t and generic dual-frequency FM demodulator\n\n" | ||
| "(probably not a good idea to use with e4000 tuners)\n" | ||
| "Use: rtl_ais [options] [outputfile]\n" | ||
| "\t[-l left_frequency (default: 161.975M)]\n" | ||
| "\t[-r right_frequency (default: 162.025M)]\n" | ||
| "\t left freq < right freq\n" | ||
| "\t frequencies must be within 1.2MHz\n" | ||
| "\t[-s sample_rate (default: 24k)]\n" | ||
| "\t maximum value, might be down to 12k\n" | ||
| "\t[-o output_rate (default: 48k)]\n" | ||
| "\t must be equal or greater than twice -s value\n" | ||
| "\t[-E toggle edge tuning (default: off)]\n" | ||
| "\t[-D toggle DC filter (default: on)]\n" | ||
| //"\t[-O toggle oversampling (default: off)\n" | ||
| "\t[-d device_index (default: 0)]\n" | ||
| "\t[-g tuner_gain (default: automatic)]\n" | ||
| "\t[-p ppm_error (default: 0)]\n" | ||
| "\t[-R enable RTL chip AGC (default: off)]\n" | ||
| "\t[-A turn off built-in AIS decoder (default: on)]\n" | ||
| "\t use this option to output samples to file or stdout.\n" | ||
| "\tBuilt-in AIS decoder options:\n" | ||
| "\t[-h host (default: 127.0.0.1)]\n" | ||
| "\t[-P port (default: 10110)]\n" | ||
| "\t[-n log NMEA sentences to console (stderr) (default off)]\n" | ||
| "\t[-L log sound levels to console (stderr) (default off)]\n\n" | ||
| "\t[-S seconds_for_decoder_stats (default 0=off)]\n\n" | ||
| "\tWhen the built-in AIS decoder is disabled the samples are sent to\n" | ||
| "\tto [outputfile] (a '-' dumps samples to stdout)\n" | ||
| "\t omitting the filename also uses stdout\n\n" | ||
| "\tOutput is stereo 2x16 bit signed ints\n\n" | ||
| "\tExamples:\n" | ||
| "\tReceive AIS traffic,sent UDP NMEA sentences to 127.0.0.1 port 10110\n" | ||
| "\t and log the senteces to console:\n\n" | ||
| "\trtl_ais -n\n\n" | ||
| "\tTune two fm stations and play one on each channel:\n\n" | ||
| "\trtl_ais -l233.15M -r233.20M -A | play -r48k -traw -es -b16 -c2 -V1 - " | ||
| "\n"); | ||
| exit(1); | ||
| } | ||
|
|
||
| static volatile int do_exit = 0; | ||
| static void sighandler(int signum) | ||
| { | ||
| signum = signum; | ||
| fprintf(stderr, "Signal caught, exiting!\n"); | ||
| do_exit = 1; | ||
| } | ||
|
|
||
| int main(int argc, char **argv) | ||
| { | ||
| #ifndef WIN32 | ||
| struct sigaction sigact; | ||
|
|
||
| sigact.sa_handler = sighandler; | ||
| sigemptyset(&sigact.sa_mask); | ||
| sigact.sa_flags = 0; | ||
| sigaction(SIGINT, &sigact, NULL); | ||
| sigaction(SIGTERM, &sigact, NULL); | ||
| sigaction(SIGQUIT, &sigact, NULL); | ||
| sigaction(SIGPIPE, &sigact, NULL); | ||
| #else | ||
| signal(SIGINT, sighandler); | ||
| signal(SIGTERM, sighandler); | ||
| #endif | ||
| int opt; | ||
|
|
||
| struct rtl_ais_config config; | ||
| rtl_ais_default_config(&config); | ||
|
|
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| config.host = strdup("127.0.0.1"); | ||
| config.port = strdup("10110"); | ||
|
|
||
| while ((opt = getopt(argc, argv, "l:r:s:o:EODd:g:p:RAP:h:nLS:?")) != -1) | ||
| { | ||
| switch (opt) { | ||
| case 'l': | ||
| config.left_freq = (int)atofs(optarg); | ||
| break; | ||
| case 'r': | ||
| config.right_freq = (int)atofs(optarg); | ||
| break; | ||
| case 's': | ||
| config.sample_rate = (int)atofs(optarg); | ||
| break; | ||
| case 'o': | ||
| config.output_rate = (int)atofs(optarg); | ||
| break; | ||
| case 'E': | ||
| config.edge = !config.edge; | ||
| break; | ||
| case 'D': | ||
| config.dc_filter = !config.dc_filter; | ||
| break; | ||
| case 'O': | ||
| config.oversample = !config.oversample; | ||
| break; | ||
| case 'd': | ||
| config.dev_index = verbose_device_search(optarg); | ||
| config.dev_given = 1; | ||
| break; | ||
| case 'g': | ||
| config.gain = (int)(atof(optarg) * 10); | ||
| break; | ||
| case 'p': | ||
| config.ppm_error = atoi(optarg); | ||
| config.custom_ppm = 1; | ||
| break; | ||
| case 'R': | ||
| config.rtl_agc=1; | ||
| break; | ||
| case 'A': | ||
| config.use_internal_aisdecoder=0; | ||
| break; | ||
| case 'P': | ||
| config.port=strdup(optarg); | ||
| break; | ||
| case 'T': | ||
| config.use_tcp_listener=1; | ||
| break; | ||
| case 't': | ||
| config.tcp_keep_ais_time = atoi(optarg); | ||
| break; | ||
| case 'h': | ||
| config.host=strdup(optarg); | ||
| break; | ||
| case 'L': | ||
| config.show_levels=1; | ||
| break; | ||
| case 'S': | ||
| config.seconds_for_decoder_stats=atoi(optarg); | ||
| break; | ||
| case 'n': | ||
| config.debug_nmea = 1; | ||
| break; | ||
| case '?': | ||
| default: | ||
| usage(); | ||
| return 2; | ||
| } | ||
| } | ||
|
|
||
| if (argc <= optind) { | ||
| config.filename = "-"; | ||
| } else { | ||
| config.filename = argv[optind]; | ||
| } | ||
|
|
||
| if (config.edge) { | ||
| fprintf(stderr, "Edge tuning enabled.\n"); | ||
| } else { | ||
| fprintf(stderr, "Edge tuning disabled.\n"); | ||
| } | ||
| if (config.dc_filter) { | ||
| fprintf(stderr, "DC filter enabled.\n"); | ||
| } else { | ||
| fprintf(stderr, "DC filter disabled.\n"); | ||
| } | ||
| if (config.rtl_agc) { | ||
| fprintf(stderr, "RTL AGC enabled.\n"); | ||
| } else { | ||
| fprintf(stderr, "RTL AGC disabled.\n"); | ||
| } | ||
| if (config.use_internal_aisdecoder) { | ||
| fprintf(stderr, "Internal AIS decoder enabled.\n"); | ||
| } else { | ||
| fprintf(stderr, "Internal AIS decoder disabled.\n"); | ||
| } | ||
|
|
||
| struct rtl_ais_context *ctx = rtl_ais_start(&config); | ||
| if(!ctx) { | ||
| fprintf(stderr, "\nrtl_ais_start failed, exiting...\n"); | ||
| exit(1); | ||
| } | ||
|
|
||
| // loop printing received ais messages to console | ||
| while(!do_exit && rtl_ais_isactive(ctx)) { | ||
| const char *str; | ||
| while((str = rtl_ais_next_message(ctx))) | ||
| puts(str); | ||
|
|
||
| usleep(50000); | ||
| } | ||
|
|
||
| rtl_ais_cleanup(ctx); | ||
| return 0; | ||
| } |
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