398 lines
10 KiB
C
398 lines
10 KiB
C
/* B-Netz dialer
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*
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* (C) 2018 by Andreas Eversberg <jolly@eversberg.eu>
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* All Rights Reserved
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include "../libsample/sample.h"
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#include "../libfsk/fsk.h"
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#include "../libwave/wave.h"
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#include "../libdebug/debug.h"
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#ifdef HAVE_ALSA
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#include "../libsound/sound.h"
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#endif
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#include "../liboptions/options.h"
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#include "telegramm.h"
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#define MAX_PAUSE 0.5 /* pause before and after dialing sequence */
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#define F0 2070.0
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#define F1 1950.0
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#define BIT_RATE 100.0
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/* presets */
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char start_digit = 's';
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const char *station_id = "50993";
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const char *dialing;
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const char *dsp_audiodev = "hw:0,0";
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int dsp_samplerate = 48000;
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const char *write_tx_wave = NULL;
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int dsp_buffer = 50;
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/* states */
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enum tx_mode {
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TX_MODE_SILENCE,
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TX_MODE_FSK,
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TX_MODE_DONE,
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} tx_mode = TX_MODE_SILENCE;
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int tx_silence_count = 0;
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char funkwahl[128];
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int digit_pos = 0;
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const char *tx_telegramm = NULL;
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int tx_telegramm_pos = 0;
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/* instances */
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fsk_mod_t fsk_mod;
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#ifdef HAVE_ALSA
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void *audio = NULL;
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#endif
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wave_rec_t wave_tx_rec;
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/* dummy functions */
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int num_kanal = 1; /* only one channel used for debugging */
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void *get_sender_by_empfangsfrequenz() { return NULL; }
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void display_measurements_add() {}
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void display_measurements_update() {}
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#define OPT_METERING 1000
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#define OPT_COIN_BOX 1001
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static void print_help(const char *arg0)
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{
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printf("Usage: %s [options] <number>\n\n", arg0);
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/* - - */
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printf("This program generates a dialing sequence to make a call via B-Netz base\n");
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printf("station using an amateur radio transceiver.\n");
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printf("Also it can write an audio file (wave) to be fed into B-Netz base station for\n");
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printf("showing how it simulates a B-Netz phone doing an outgoing call.\n\n");
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printf(" -h --help\n");
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printf(" This help\n");
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printf(" -i --station-id <station ID>\n");
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printf(" 5 Digits of ID of mobile station (default = '%s')\n", station_id);
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#ifdef HAVE_ALSA
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printf(" -a --audio-device hw:<card>,<device>\n");
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printf(" Sound card and device number (default = '%s')\n", dsp_audiodev);
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#endif
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printf(" -s --samplerate <rate>\n");
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printf(" Sample rate of sound device (default = '%d')\n", dsp_samplerate);
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printf(" -w --write-tx-wave <file>\n");
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printf(" Write audio to given wave file also.\n");
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printf(" -g --gebuehenimpuls\n");
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printf(" -g --metering\n");
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printf(" Indicate to base station that we have a charge meter on board.\n");
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printf(" This will allow the base station to send billing tones during call.\n");
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printf(" -m --muenztelefon\n");
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printf(" -m --coin-box\n");
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printf(" Indicate to base station that we are a pay phone. ('Muenztelefon')\n");
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}
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static void add_options(void)
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{
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option_add('h', "help", 0);
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option_add('i', "station-id", 1);
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option_add('a', "audio-device", 1);
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option_add('s', "samplerate", 1);
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option_add('w', "write-tx-wave", 1);
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option_add('g', "gebuehrenimpuls", 0);
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option_add(OPT_METERING, "metering", 0);
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option_add('m', "muenztelefon", 0);
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option_add(OPT_COIN_BOX, "coin-box", 0);
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}
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static int handle_options(int short_option, int __attribute__((unused)) argi, char **argv)
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{
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switch (short_option) {
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case 'h':
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print_help(argv[0]);
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return 0;
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case 'i':
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station_id = options_strdup(argv[argi]);
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break;
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case 'a':
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dsp_audiodev = options_strdup(argv[argi]);
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break;
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case 's':
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dsp_samplerate = atoi(argv[argi]);
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break;
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case 'w':
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write_tx_wave = options_strdup(argv[argi]);
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break;
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case 'g':
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case OPT_METERING:
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start_digit = 'S';
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break;
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case 'm':
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case OPT_COIN_BOX:
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start_digit = 'M';
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break;
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default:
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return -EINVAL;
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}
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return 1;
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}
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/* process next fsk bit.
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* if the dial string terminates, change to SILENCE mode
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*/
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static int fsk_send_bit(void __attribute__((unused)) *inst)
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{
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struct impulstelegramm *impulstelegramm;
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if (!tx_telegramm || tx_telegramm_pos == 16) {
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switch (funkwahl[digit_pos]) {
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case '\0':
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PDEBUG(DBNETZ, DEBUG_INFO, "Done sending dialing sequence\n");
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tx_mode = TX_MODE_SILENCE;
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tx_silence_count = 0;
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return -1;
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case 'w':
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if (!tx_telegramm)
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PDEBUG(DBNETZ, DEBUG_INFO, "Sending channel allocation tone ('Kanalbelegung')\n");
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tx_telegramm = "0000000000000000";
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tx_telegramm_pos = 0;
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digit_pos++;
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break;
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default:
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switch (funkwahl[digit_pos]) {
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case 's':
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PDEBUG(DBNETZ, DEBUG_INFO, "Sending start digit (no charging meater on board)\n");
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break;
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case 'S':
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PDEBUG(DBNETZ, DEBUG_INFO, "Sending start digit (with charging meater on board)\n");
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break;
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case 'M':
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PDEBUG(DBNETZ, DEBUG_INFO, "Sending start digit (Phone is a coin box.)\n");
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break;
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case 'e':
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PDEBUG(DBNETZ, DEBUG_INFO, "Sending stop digit\n");
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break;
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default:
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PDEBUG(DBNETZ, DEBUG_INFO, "Sending digit '%c'\n", funkwahl[digit_pos]);
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}
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impulstelegramm = bnetz_digit2telegramm(funkwahl[digit_pos]);
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if (!impulstelegramm) {
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PDEBUG(DBNETZ, DEBUG_ERROR, "Illegal digit '%c', please fix!\n", funkwahl[digit_pos]);
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abort();
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}
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tx_telegramm = impulstelegramm->sequence;
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tx_telegramm_pos = 0;
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digit_pos++;
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}
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}
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return tx_telegramm[tx_telegramm_pos++];
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}
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/* encode audio */
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static void encode_audio(sample_t *samples, uint8_t *power, int length)
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{
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int count;
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memset(power, 1, length);
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again:
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switch (tx_mode) {
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case TX_MODE_SILENCE:
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memset(samples, 0, length * sizeof(*samples));
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tx_silence_count += length;
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if (tx_silence_count >= (int)((double)dsp_samplerate * MAX_PAUSE)) {
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if (funkwahl[digit_pos])
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tx_mode = TX_MODE_FSK;
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else
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tx_mode = TX_MODE_DONE;
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}
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break;
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case TX_MODE_FSK:
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/* send FSK until it stops, then fill with silence */
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count = fsk_mod_send(&fsk_mod, samples, length, 0);
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samples += count;
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length -= count;
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if (length)
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goto again;
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break;
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default:
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break;
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}
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}
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/* loop that gets audio from encoder and forwards it to sound card.
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* alternatively a sound file is written.
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*/
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static void process_signal(int buffer_size)
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{
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sample_t buff[buffer_size], *samples[1] = { buff };
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uint8_t pbuff[buffer_size], *power[1] = { pbuff };
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int count;
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int __attribute__((unused)) rc;
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while (tx_mode != TX_MODE_DONE) {
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#ifdef HAVE_ALSA
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count = sound_get_tosend(audio, buffer_size);
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#else
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count = dsp_samplerate / 1000;
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#endif
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if (count < 0) {
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PDEBUG(DDSP, DEBUG_ERROR, "Failed to get number of samples in buffer (rc = %d)!\n", count);
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break;
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}
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/* get fsk / silence */
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encode_audio(samples[0], power[0], count);
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/* write wave, if open */
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if (wave_tx_rec.fp)
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wave_write(&wave_tx_rec, samples, count);
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#ifdef HAVE_ALSA
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/* write audio */
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rc = sound_write(audio, samples, power, count, NULL, NULL, 1);
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if (rc < 0) {
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PDEBUG(DDSP, DEBUG_ERROR, "Failed to write TX data to audio device (rc = %d)\n", rc);
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break;
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}
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#endif
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/* sleep a while */
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usleep(1000);
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}
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}
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int main(int argc, char *argv[])
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{
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int i;
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int rc, argi;
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int buffer_size;
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/* init */
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bnetz_init_telegramm();
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memset(&fsk_mod, 0, sizeof(fsk_mod));
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/* size of send buffer in samples */
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buffer_size = dsp_samplerate * dsp_buffer / 1000;
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/* handle options / config file */
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add_options();
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argi = options_command_line(argc, argv, handle_options);
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if (argi <= 0)
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return argi;
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if (argi >= argc) {
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printf("No phone number given!\n\n");
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print_help(argv[0]);
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goto exit;
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}
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/* check for valid station ID */
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if (strlen(station_id) != 5) {
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printf("Given station ID '%s' has too many digits!\n", station_id);
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goto exit;
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}
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for (i = 0; station_id[i]; i++) {
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if (station_id[i] < '0' || station_id[i] > '9') {
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printf("Given station ID '%s' has invalid digits!\n", station_id);
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goto exit;
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}
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}
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/* check for valid phone number */
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dialing = argv[argi];
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if (strlen(dialing) < 4) {
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printf("Given phone number '%s' has too few digits! (less than minimum of 4 digits)\n", dialing);
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goto exit;
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}
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if (strlen(dialing) > 14) {
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printf("Given phone number '%s' has too many digits! (more than allowed 14 digits)\n", dialing);
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goto exit;
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}
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for (i = 0; dialing[i]; i++) {
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if (dialing[i] < '0' || dialing[i] > '9') {
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printf("Given phone number '%s' has invalid digits!\n", dialing);
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goto exit;
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}
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}
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if (dialing[0] != '0') {
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printf("Given phone number '%s' does not start with 0!\n", dialing);
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goto exit;
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}
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/* dial string: 640 ms pause, 640 ms 2070 HZ, 2 * {start, station ID, number, stop}, 640 ms pause */
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sprintf(funkwahl, "wwww%c%s%se%c%s%se", start_digit, station_id, dialing + 1, start_digit, station_id, dialing + 1);
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/* init fsk */
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if (fsk_mod_init(&fsk_mod, NULL, fsk_send_bit, dsp_samplerate, BIT_RATE, F0, F1, 1.0, 0, 0) < 0) {
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PDEBUG(DDSP, DEBUG_ERROR, "FSK init failed!\n");
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goto exit;
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}
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#ifdef HAVE_ALSA
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/* init sound */
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audio = sound_open(dsp_audiodev, NULL, NULL, NULL, 1, 0.0, dsp_samplerate, buffer_size, 1.0, 1.0, 4000.0, 2.0);
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if (!audio) {
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PDEBUG(DBNETZ, DEBUG_ERROR, "No sound device!\n");
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goto exit;
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}
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#endif
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/* open wave */
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if (write_tx_wave) {
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rc = wave_create_record(&wave_tx_rec, write_tx_wave, dsp_samplerate, 1, 1.0);
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if (rc < 0) {
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PDEBUG(DBNETZ, DEBUG_ERROR, "Failed to create WAVE recoding instance!\n");
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goto exit;
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}
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}
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#ifndef HAVE_ALSA
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else {
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PDEBUG(DBNETZ, DEBUG_ERROR, "No sound support compiled in, so you need to write to a wave file. See help!\n");
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goto exit;
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}
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#endif
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#ifdef HAVE_ALSA
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/* start sound */
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sound_start(audio);
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#endif
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PDEBUG(DBNETZ, DEBUG_ERROR, "Start audio after pause...\n");
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process_signal(buffer_size);
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exit:
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/* close wave */
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wave_destroy_record(&wave_tx_rec);
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#ifdef HAVE_ALSA
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/* exit sound */
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if (audio)
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sound_close(audio);
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#endif
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/* exit fsk */
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fsk_mod_cleanup(&fsk_mod);
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options_free();
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return 0;
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}
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