aboutsummaryrefslogtreecommitdiffstats
path: root/src/common/sender.c
blob: da7822b08acbb95cfebf6cb27f2faf2077379807 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
/* Common transceiver functions
 *
 * (C) 2016 by Andreas Eversberg <jolly@eversberg.eu>
 * All Rights Reserved
 *
 * 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 3 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/>.
 */

#define CHAN sender->kanal

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include "sample.h"
#include "debug.h"
#include "sender.h"

sender_t *sender_head = NULL;
static sender_t **sender_tailp = &sender_head;
int cant_recover = 0;

/* Init transceiver instance and link to list of transceivers. */
int sender_create(sender_t *sender, int kanal, double sendefrequenz, double empfangsfrequenz, const char *audiodev, int samplerate, double rx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, int loopback, double loss_volume, enum paging_signal paging_signal)
{
	sender_t *master, *slave;
	int rc = 0;

	sender->kanal = kanal;
	sender->sendefrequenz = sendefrequenz;
	sender->empfangsfrequenz = empfangsfrequenz;
	strncpy(sender->audiodev, audiodev, sizeof(sender->audiodev) - 1);
	sender->samplerate = samplerate;
	sender->rx_gain = rx_gain;
	sender->pre_emphasis = pre_emphasis;
	sender->de_emphasis = de_emphasis;
	sender->loopback = loopback;
	sender->loss_volume = loss_volume;
	sender->paging_signal = paging_signal;
	sender->write_rx_wave = write_rx_wave;
	sender->write_tx_wave = write_tx_wave;
	sender->read_rx_wave = read_rx_wave;

	/* no gain with SDR */
	if (!strcmp(audiodev, "sdr"))
		sender->rx_gain = 1.0;

	PDEBUG_CHAN(DSENDER, DEBUG_DEBUG, "Creating 'Sender' instance\n");

	/* if we find a channel that uses the same device as we do,
	 * we will link us as slave to this master channel. then we 
	 * receive and send audio via second channel of the device
	 * of the master channel.
	 */
	for (master = sender_head; master; master = master->next) {
		if (master->kanal == kanal) {
			PDEBUG(DSENDER, DEBUG_ERROR, "Channel %d may not be defined for multiple transceivers!\n", kanal);
			rc = -EIO;
			goto error;
		}
		if (!strcmp(master->audiodev, audiodev))
			break;
	}
	if (master) {
		if (master->paging_signal != PAGING_SIGNAL_NONE && !!strcmp(master->audiodev, "sdr")) {
			PDEBUG(DSENDER, DEBUG_ERROR, "Cannot share audio device with channel %d, because its second audio channel is used for paging signal! Use different audio device.\n", master->kanal);
			rc = -EBUSY;
			goto error;
		}
		if (paging_signal != PAGING_SIGNAL_NONE && !!strcmp(audiodev, "sdr")) {
			PDEBUG(DSENDER, DEBUG_ERROR, "Cannot share audio device with channel %d, because we need a second audio channel for paging signal! Use different audio device.\n", master->kanal);
			rc = -EBUSY;
			goto error;
		}
		/* link us to a master */
		sender->master = master;
		/* link master (or last slave) to us */
		for (slave = master; ; slave = slave->slave) {
			if (!slave->slave)
				break;
		}
		slave->slave = sender;
	} else {
		/* link audio device */
#ifdef HAVE_SDR
		if (!strcmp(audiodev, "sdr")) {
			sender->audio_open = sdr_open;
			sender->audio_start = sdr_start;
			sender->audio_close = sdr_close;
			sender->audio_read = sdr_read;
			sender->audio_write = sdr_write;
			sender->audio_get_tosend = sdr_get_tosend;
		} else
#endif
		{
			sender->audio_open = sound_open;
			sender->audio_start = sound_start;
			sender->audio_close = sound_close;
			sender->audio_read = sound_read;
			sender->audio_write = sound_write;
			sender->audio_get_tosend = sound_get_tosend;
		}
	}

	rc = init_samplerate(&sender->srstate, 8000.0, (double)samplerate);
	if (rc < 0) {
		PDEBUG(DSENDER, DEBUG_ERROR, "Failed to init sample rate conversion!\n");
		goto error;
	}

	rc = jitter_create(&sender->dejitter, samplerate / 5);
	if (rc < 0) {
		PDEBUG(DSENDER, DEBUG_ERROR, "Failed to create and init audio buffer!\n");
		goto error;
	}

	rc = init_emphasis(&sender->estate, samplerate, CUT_OFF_EMPHASIS_DEFAULT);
	if (rc < 0)
		goto error;

	*sender_tailp = sender;
	sender_tailp = &sender->next;

	display_wave_init(sender, samplerate);

	return 0;
error:
	sender_destroy(sender);

	return rc;
}

int sender_open_audio(void)
{
	sender_t *master, *inst;
	int channels;
	double paging_frequency = 0.0;
	int i;
	int rc;

	for (master = sender_head; master; master = master->next) {
		/* skip audio slaves */
		if (master->master)
			continue;

		/* get list of frequencies */
		channels = 0;
		for (inst = master; inst; inst = inst->slave) {
			channels++;
		}
		double tx_f[channels], rx_f[channels];
		for (i = 0, inst = master; inst; i++, inst = inst->slave) {
			tx_f[i] = inst->sendefrequenz;
			if (inst->loopback)
				rx_f[i] = inst->sendefrequenz;
			else
				rx_f[i] = inst->empfangsfrequenz;
			if (inst->ruffrequenz)
				paging_frequency = inst->ruffrequenz;
		}

		if (master->write_rx_wave) {
			rc = wave_create_record(&master->wave_rx_rec, master->write_rx_wave, master->samplerate, channels, master->max_deviation);
			if (rc < 0) {
				PDEBUG(DSENDER, DEBUG_ERROR, "Failed to create WAVE recoding instance!\n");
				return rc;
			}
		}
		if (master->write_tx_wave) {
			rc = wave_create_record(&master->wave_tx_rec, master->write_tx_wave, master->samplerate, channels, master->max_deviation);
			if (rc < 0) {
				PDEBUG(DSENDER, DEBUG_ERROR, "Failed to create WAVE recoding instance!\n");
				return rc;
			}
		}
		if (master->read_rx_wave) {
			rc = wave_create_playback(&master->wave_rx_play, master->read_rx_wave, master->samplerate, channels, master->max_deviation);
			if (rc < 0) {
				PDEBUG(DSENDER, DEBUG_ERROR, "Failed to create WAVE playback instance!\n");
				return rc;
			}
		}

		/* open device */
		master->audio = master->audio_open(master->audiodev, tx_f, rx_f, channels, paging_frequency, master->samplerate, master->max_deviation, master->max_modulation);
		if (!master->audio) {
			PDEBUG(DSENDER, DEBUG_ERROR, "No audio device!\n");
			return -EIO;
		}
	}

	return 0;
}

int sender_start_audio(void)
{
	sender_t *master;
	int rc = 0;

	for (master = sender_head; master; master = master->next) {
		/* skip audio slaves */
		if (master->master)
			continue;

		rc = master->audio_start(master->audio);
		if (rc)
			break;
	}

	return rc;
}

/* Destroy transceiver instance and unlink from list. */
void sender_destroy(sender_t *sender)
{
	PDEBUG_CHAN(DSENDER, DEBUG_DEBUG, "Destroying 'Sender' instance\n");

	sender_tailp = &sender_head;
	while (*sender_tailp) {
		if (sender == *sender_tailp)
			*sender_tailp = (*sender_tailp)->next;
		else
			sender_tailp = &((*sender_tailp)->next);
	}

	if (sender->audio) {
		sender->audio_close(sender->audio);
		sender->audio = NULL;
	}

	wave_destroy_record(&sender->wave_rx_rec);
	wave_destroy_record(&sender->wave_tx_rec);
	wave_destroy_playback(&sender->wave_rx_play);

	jitter_destroy(&sender->dejitter);
}

void sender_set_fm(sender_t *sender, double max_deviation, double max_modulation, double dBm0_deviation, double max_display)
{
	sender->max_deviation = max_deviation;
	sender->max_modulation = max_modulation;
	sender->dBm0_deviation = dBm0_deviation;
	sender->max_display = max_display;

	PDEBUG_CHAN(DSENDER, DEBUG_DEBUG, "Maxium deviation: %.1f kHz, Maximum modulation: %.1f kHz\n", max_deviation / 1000.0, max_modulation / 1000.0);
	PDEBUG_CHAN(DSENDER, DEBUG_DEBUG, "Deviation at dBm0 (audio level): %.1f kHz\n", dBm0_deviation / 1000.0);
}

static void gain_samples(sample_t *samples, int length, double gain)
{
	int i;

	for (i = 0; i < length; i++)
		*samples++ *= gain;
}

/* Handle audio streaming of one transceiver. */
void process_sender_audio(sender_t *sender, int *quit, int latspl)
{
	sender_t *inst;
	int rc, count;
	int num_chan, i;

	/* count instances for audio channel */
	for (num_chan = 0, inst = sender; inst; num_chan++, inst = inst->slave);
	sample_t buff[num_chan][latspl], *samples[num_chan];
	enum paging_signal paging_signal[num_chan];
	int on[num_chan];
	for (i = 0; i < num_chan; i++) {
		samples[i] = buff[i];
	}

	count = sender->audio_get_tosend(sender->audio, latspl);
	if (count < 0) {
		PDEBUG(DSENDER, DEBUG_ERROR, "Failed to get samples in buffer (rc = %d)!\n", count);
		if (count == -EPIPE) {
			if (cant_recover) {
cant_recover:
				PDEBUG(DSENDER, DEBUG_ERROR, "Cannot recover due to measurements, quitting!\n");
				*quit = 1;
				return;
			}
			PDEBUG(DSENDER, DEBUG_ERROR, "Trying to recover!\n");
		}
		return;
	}
	if (count > 0) {
		/* limit to our buffer */
		if (count > latspl)
			count = latspl;
		/* loop through all channels */
		for (i = 0, inst = sender; inst; i++, inst = inst->slave) {
			/* load TX data from audio loop or from sender instance */
			if (inst->loopback == 3)
				jitter_load(&inst->dejitter, samples[i], count);
			else
				sender_send(inst, samples[i], count);
			/* internal loopback: loop back TX audio to RX */
			if (inst->loopback == 1) {
				display_wave(inst, samples[i], count, inst->max_display);
				sender_receive(inst, samples[i], count);
			}
			/* do pre emphasis towards radio */
			if (inst->pre_emphasis)
				pre_emphasis(&inst->estate, samples[i], count);
			/* normal level to frequency deviation of dBm0 */
			gain_samples(samples[i], count, inst->dBm0_deviation);
			/* set paging signal */
			paging_signal[i] = inst->paging_signal;
			on[i] = inst->paging_on;
		}

		if (sender->wave_tx_rec.fp)
			wave_write(&sender->wave_tx_rec, samples, count);

		rc = sender->audio_write(sender->audio, samples, count, paging_signal, on, num_chan);
		if (rc < 0) {
			PDEBUG(DSENDER, DEBUG_ERROR, "Failed to write TX data to audio device (rc = %d)\n", rc);
			if (rc == -EPIPE) {
				if (cant_recover)
					goto cant_recover;
				PDEBUG(DSENDER, DEBUG_ERROR, "Trying to recover!\n");
			}
			return;
		}
	}

	count = sender->audio_read(sender->audio, samples, latspl, num_chan);
	if (count < 0) {
		/* special case when audio_read wants us to quit */
		if (count == -EPERM) {
			*quit = 1;
			return;
		}
		PDEBUG(DSENDER, DEBUG_ERROR, "Failed to read from audio device (rc = %d)!\n", count);
		if (count == -EPIPE) {
			if (cant_recover)
				goto cant_recover;
			PDEBUG(DSENDER, DEBUG_ERROR, "Trying to recover!\n");
		}
		return;
	}
	if (count) {
		if (sender->wave_rx_rec.fp)
			wave_write(&sender->wave_rx_rec, samples, count);
		if (sender->wave_rx_play.fp)
			wave_read(&sender->wave_rx_play, samples, count);

		/* loop through all channels */
		for (i = 0, inst = sender; inst; i++, inst = inst->slave) {
			/* frequency deviation of dBm0 to normal level */
			gain_samples(samples[i], count, 1.0 / inst->dBm0_deviation);
			/* rx gain */
			if (inst->rx_gain != 1.0)
				gain_samples(samples[i], count, inst->rx_gain);
			/* do filter and de-emphasis from radio receive audio, process echo test */
			if (inst->de_emphasis) {
				dc_filter(&inst->estate, samples[i], count);
				de_emphasis(&inst->estate, samples[i], count);
			}
			if (inst->loopback != 1) {
				display_wave(inst, samples[i], count, inst->max_display);
				sender_receive(inst, samples[i], count);
			}
			if (inst->loopback == 3)
				jitter_save(&inst->dejitter, samples[i], count);
		}
	}
}

void sender_paging(sender_t *sender, int on)
{
	sender->paging_on = on;
}