aboutsummaryrefslogtreecommitdiffstats
path: root/indications.c
blob: 9598c5438a86fb8d61fef2a1cff2231c2c806998 (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
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * Tone Management
 * 
 * Copyright (C) 2002, Pauline Middelink
 *
 * Pauline Middelink <middelink@polyware.nl>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 *
 * This set of function allow us to play a list of tones on a channel.
 * Each element has two frequencies, which are mixed together and a
 * duration. For silence both frequencies can be set to 0.
 * The playtones can be given as a comma seperated string.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>			/* For PI */
#include <asterisk/indications.h>
#include <asterisk/frame.h>
#include <asterisk/options.h>
#include <asterisk/channel.h>
#include <asterisk/logger.h>
#include <asterisk/lock.h>

struct playtones_item {
	int freq1;
	int freq2;
	int duration;
	int modulate;
};

struct playtones_def {
	int vol;
	int reppos;
	int nitems;
	int interruptible;
	struct playtones_item *items;
};

struct playtones_state {
	int vol;
	int reppos;
	int nitems;
	struct playtones_item *items;
	int npos;
	int pos;
	int origwfmt;
	struct ast_frame f;
	unsigned char offset[AST_FRIENDLY_OFFSET];
	short data[4000];
};

static void playtones_release(struct ast_channel *chan, void *params)
{
	struct playtones_state *ps = params;
	if (chan) {
		ast_set_write_format(chan, ps->origwfmt);
	}
	if (ps->items) free(ps->items);
	free(ps);
}

static void * playtones_alloc(struct ast_channel *chan, void *params)
{
	struct playtones_def *pd = params;
	struct playtones_state *ps = malloc(sizeof(struct playtones_state));
	if (!ps)
		return NULL;
	memset(ps, 0, sizeof(struct playtones_state));
	ps->origwfmt = chan->writeformat;
	if (ast_set_write_format(chan, AST_FORMAT_SLINEAR)) {
		ast_log(LOG_WARNING, "Unable to set '%s' to signed linear format (write)\n", chan->name);
		playtones_release(NULL, ps);
		ps = NULL;
	} else {
		ps->vol = pd->vol;
		ps->reppos = pd->reppos;
		ps->nitems = pd->nitems;
		ps->items = pd->items;
	}
	/* Let interrupts interrupt :) */
	chan->writeinterrupt = pd->interruptible;
	return ps;
}

static int playtones_generator(struct ast_channel *chan, void *data, int len, int samples)
{
	struct playtones_state *ps = data;
	struct playtones_item *pi;
	int x;
	/* we need to prepare a frame with 16 * timelen samples as we're 
	 * generating SLIN audio
	 */
	len = samples * 2;
	if (len > sizeof(ps->data) / 2 - 1) {
		ast_log(LOG_WARNING, "Can't generate that much data!\n");
		return -1;
	}
	memset(&ps->f, 0, sizeof(ps->f));

	pi = &ps->items[ps->npos];
	for (x=0;x<len/2;x++) {
		if (pi->modulate)
		/* Modulate 1st tone with 2nd, to 90% modulation depth */
		ps->data[x] = ps->vol * 2 * (
			sin((pi->freq1 * 2.0 * M_PI / 8000.0) * (ps->pos + x)) *
			(0.9 * fabs(sin((pi->freq2 * 2.0 * M_PI / 8000.0) * (ps->pos + x))) + 0.1)
			);
		else
			/* Add 2 tones together */
			ps->data[x] = ps->vol * (
				sin((pi->freq1 * 2.0 * M_PI / 8000.0) * (ps->pos + x)) +
				sin((pi->freq2 * 2.0 * M_PI / 8000.0) * (ps->pos + x))
			);
	}
	ps->f.frametype = AST_FRAME_VOICE;
	ps->f.subclass = AST_FORMAT_SLINEAR;
	ps->f.datalen = len;
	ps->f.samples = samples;
	ps->f.offset = AST_FRIENDLY_OFFSET;
	ps->f.data = ps->data;
	ps->f.delivery.tv_sec = 0;
	ps->f.delivery.tv_usec = 0;
	ast_write(chan, &ps->f);

	ps->pos += x;
	if (pi->duration && ps->pos >= pi->duration * 8) {	/* item finished? */
		ps->pos = 0;					/* start new item */
		ps->npos++;
		if (ps->npos >= ps->nitems) {			/* last item? */
			if (ps->reppos == -1)			/* repeat set? */
				return -1;
			ps->npos = ps->reppos;			/* redo from top */
		}
	}
	return 0;
}

static struct ast_generator playtones = {
	alloc: playtones_alloc,
	release: playtones_release,
	generate: playtones_generator,
};

int ast_playtones_start(struct ast_channel *chan, int vol, const char *playlst, int interruptible)
{
	char *s, *data = ast_strdupa(playlst); /* cute */
	struct playtones_def d = { vol, -1, 0, 1, NULL};
	char *stringp=NULL;
	char *separator;
	if (!data)
		return -1;
	if (vol < 1)
		d.vol = 8192;

	d.interruptible = interruptible;
	
	stringp=data;
	/* the stringp/data is not null here */
	/* check if the data is separated with '|' or with ',' by default */
	if (strchr(stringp,'|'))
		separator = "|";
	else
		separator = ",";
	s = strsep(&stringp,separator);
	while (s && *s) {
		int freq1, freq2, time, modulate=0;

		if (s[0]=='!')
			s++;
		else if (d.reppos == -1)
			d.reppos = d.nitems;
		if (sscanf(s, "%d+%d/%d", &freq1, &freq2, &time) == 3) {
			/* f1+f2/time format */
		} else if (sscanf(s, "%d+%d", &freq1, &freq2) == 2) {
			/* f1+f2 format */
			time = 0;
		} else if (sscanf(s, "%d*%d/%d", &freq1, &freq2, &time) == 3) {
			/* f1*f2/time format */
			modulate = 1;
		} else if (sscanf(s, "%d*%d", &freq1, &freq2) == 2) {
			/* f1*f2 format */
			time = 0;
			modulate = 1;
		} else if (sscanf(s, "%d/%d", &freq1, &time) == 2) {
			/* f1/time format */
			freq2 = 0;
		} else if (sscanf(s, "%d", &freq1) == 1) {
			/* f1 format */
			freq2 = 0;
			time = 0;
		} else {
			ast_log(LOG_WARNING,"%s: tone component '%s' of '%s' is no good\n",chan->name,s,playlst);
			return -1;
		}

		d.items = realloc(d.items,(d.nitems+1)*sizeof(struct playtones_item));
		if (d.items == NULL)
			return -1;
		d.items[d.nitems].freq1    = freq1;
		d.items[d.nitems].freq2    = freq2;
		d.items[d.nitems].duration = time;
		d.items[d.nitems].modulate = modulate;
		d.nitems++;

		s = strsep(&stringp,separator);
	}

	if (ast_activate_generator(chan, &playtones, &d)) {
		free(d.items);
		return -1;
	}
	return 0;
}

void ast_playtones_stop(struct ast_channel *chan)
{
	ast_deactivate_generator(chan);
}

/*--------------------------------------------*/

struct tone_zone *tone_zones;
static struct tone_zone *current_tonezone;

/* Protect the tone_zones list (highly unlikely that two things would change
 * it at the same time, but still! */
AST_MUTEX_DEFINE_EXPORTED(tzlock);

/* Set global indication country */
int ast_set_indication_country(const char *country)
{
	if (country) {
		struct tone_zone *z = ast_get_indication_zone(country);
		if (z) {
			if (option_verbose > 2)
				ast_verbose(VERBOSE_PREFIX_3 "Setting default indication country to '%s'\n",country);
			current_tonezone = z;
			return 0;
		}
	}
	return 1; /* not found */
}

/* locate tone_zone, given the country. if country == NULL, use the default country */
struct tone_zone *ast_get_indication_zone(const char *country)
{
	struct tone_zone *tz;
	int alias_loop = 0;

	/* we need some tonezone, pick the first */
	if (country == NULL && current_tonezone)
		return current_tonezone;	/* default country? */
	if (country == NULL && tone_zones)
		return tone_zones;		/* any country? */
	if (country == NULL)
		return 0;	/* not a single country insight */

	if (ast_mutex_lock(&tzlock)) {
		ast_log(LOG_WARNING, "Unable to lock tone_zones list\n");
		return 0;
	}
	do {
		for (tz=tone_zones; tz; tz=tz->next) {
			if (strcasecmp(country,tz->country)==0) {
				/* tone_zone found */
				if (tz->alias && tz->alias[0]) {
					country = tz->alias;
					break;
				}
				ast_mutex_unlock(&tzlock);
				return tz;
			}
		}
	} while (++alias_loop<20 && tz);
	ast_mutex_unlock(&tzlock);
	if (alias_loop==20)
		ast_log(LOG_NOTICE,"Alias loop for '%s' forcefull broken\n",country);
	/* nothing found, sorry */
	return 0;
}

/* locate a tone_zone_sound, given the tone_zone. if tone_zone == NULL, use the default tone_zone */
struct tone_zone_sound *ast_get_indication_tone(const struct tone_zone *zone, const char *indication)
{
	struct tone_zone_sound *ts;

	/* we need some tonezone, pick the first */
	if (zone == NULL && current_tonezone)
		zone = current_tonezone;	/* default country? */
	if (zone == NULL && tone_zones)
		zone = tone_zones;		/* any country? */
	if (zone == NULL)
		return 0;	/* not a single country insight */

	if (ast_mutex_lock(&tzlock)) {
		ast_log(LOG_WARNING, "Unable to lock tone_zones list\n");
		return 0;
	}
	for (ts=zone->tones; ts; ts=ts->next) {
		if (strcasecmp(indication,ts->name)==0) {
			/* found indication! */
			ast_mutex_unlock(&tzlock);
			return ts;
		}
	}
	/* nothing found, sorry */
	ast_mutex_unlock(&tzlock);
	return 0;
}

/* helper function to delete a tone_zone in its entirety */
static inline void free_zone(struct tone_zone* zone)
{
	while (zone->tones) {
		struct tone_zone_sound *tmp = zone->tones->next;
		free((void*)zone->tones->name);
		free((void*)zone->tones->data);
		free(zone->tones);
		zone->tones = tmp;
	}
	if (zone->ringcadance)
		free((void*)zone->ringcadance);
	free(zone);
}

/*--------------------------------------------*/

/* add a new country, if country exists, it will be replaced. */
int ast_register_indication_country(struct tone_zone *zone)
{
	struct tone_zone *tz,*pz;

	if (ast_mutex_lock(&tzlock)) {
		ast_log(LOG_WARNING, "Unable to lock tone_zones list\n");
		return -1;
	}
	for (pz=NULL,tz=tone_zones; tz; pz=tz,tz=tz->next) {
		if (strcasecmp(zone->country,tz->country)==0) {
			/* tone_zone already there, replace */
			zone->next = tz->next;
			if (pz)
				pz->next = zone;
			else
				tone_zones = zone;
			/* if we are replacing the default zone, re-point it */
			if (tz == current_tonezone)
				current_tonezone = zone;
			/* now free the previous zone */
			free_zone(tz);
			ast_mutex_unlock(&tzlock);
			return 0;
		}
	}
	/* country not there, add */
	zone->next = NULL;
	if (pz)
		pz->next = zone;
	else
		tone_zones = zone;
	ast_mutex_unlock(&tzlock);

	if (option_verbose > 2)
		ast_verbose(VERBOSE_PREFIX_3 "Registered indication country '%s'\n",zone->country);
	return 0;
}

/* remove an existing country and all its indications, country must exist.
 * Also, all countries which are an alias for the specified country are removed. */
int ast_unregister_indication_country(const char *country)
{
	struct tone_zone *tz, *pz = NULL, *tmp;
	int res = -1;

	if (ast_mutex_lock(&tzlock)) {
		ast_log(LOG_WARNING, "Unable to lock tone_zones list\n");
		return -1;
	}
	tz = tone_zones;
	while (tz) {
		if (country==NULL ||
		    (strcasecmp(country, tz->country)==0 ||
		     strcasecmp(country, tz->alias)==0)) {
			/* tone_zone found, remove */
			tmp = tz->next;
			if (pz)
				pz->next = tmp;
			else
				tone_zones = tmp;
			/* if we are unregistering the default country, w'll notice */
			if (tz == current_tonezone) {
				ast_log(LOG_NOTICE,"Removed default indication country '%s'\n",tz->country);
				current_tonezone = NULL;
			}
			if (option_verbose > 2)
				ast_verbose(VERBOSE_PREFIX_3 "Unregistered indication country '%s'\n",tz->country);
			free_zone(tz);
			if (tone_zones == tz)
				tone_zones = tmp;
			tz = tmp;
			res = 0;
		}
		else {
			/* next zone please */
			pz = tz;
			tz = tz->next;
		}
	}
	ast_mutex_unlock(&tzlock);
	return res;
}

/* add a new indication to a tone_zone. tone_zone must exist. if the indication already
 * exists, it will be replaced. */
int ast_register_indication(struct tone_zone *zone, const char *indication, const char *tonelist)
{
	struct tone_zone_sound *ts,*ps;

	/* is it an alias? stop */
	if (zone->alias[0])
		return -1;

	if (ast_mutex_lock(&tzlock)) {
		ast_log(LOG_WARNING, "Unable to lock tone_zones list\n");
		return -2;
	}
	for (ps=NULL,ts=zone->tones; ts; ps=ts,ts=ts->next) {
		if (strcasecmp(indication,ts->name)==0) {
			/* indication already there, replace */
			free((void*)ts->name);
			free((void*)ts->data);
			break;
		}
	}
	if (!ts) {
		/* not there, we have to add */
		ts = malloc(sizeof(struct tone_zone_sound));
		if (!ts) {
			ast_log(LOG_WARNING, "Out of memory\n");
			ast_mutex_unlock(&tzlock);
			return -2;
		}
		ts->next = NULL;
	}
	ts->name = strdup(indication);
	ts->data = strdup(tonelist);
	if (ts->name==NULL || ts->data==NULL) {
		ast_log(LOG_WARNING, "Out of memory\n");
		ast_mutex_unlock(&tzlock);
		return -2;
	}
	if (ps)
		ps->next = ts;
	else
		zone->tones = ts;
	ast_mutex_unlock(&tzlock);
	return 0;
}

/* remove an existing country's indication. Both country and indication must exist */
int ast_unregister_indication(struct tone_zone *zone, const char *indication)
{
	struct tone_zone_sound *ts,*ps = NULL, *tmp;
	int res = -1;

	/* is it an alias? stop */
	if (zone->alias[0])
		return -1;

	if (ast_mutex_lock(&tzlock)) {
		ast_log(LOG_WARNING, "Unable to lock tone_zones list\n");
		return -1;
	}
	ts = zone->tones;
	while (ts) {
		if (strcasecmp(indication,ts->name)==0) {
			/* indication found */
			tmp = ts->next;
			if (ps)
				ps->next = tmp;
			else
				zone->tones = tmp;
			free((void*)ts->name);
			free((void*)ts->data);
			free(ts);
			ts = tmp;
			res = 0;
		}
		else {
			/* next zone please */
			ps = ts;
			ts = ts->next;
		}
	}
	/* indication not found, goodbye */
	ast_mutex_unlock(&tzlock);
	return res;
}