main/indications.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 2002, Pauline Middelink
   5  *
   6  *
   7  * See http://www.asterisk.org for more information about
   8  * the Asterisk project. Please do not directly contact
   9  * any of the maintainers of this project for assistance;
  10  * the project provides a web site, mailing lists and IRC
  11  * channels for your use.
  12  *
  13  * This program is free software, distributed under the terms of
  14  * the GNU General Public License Version 2. See the LICENSE file
  15  * at the top of the source tree.
  16  */
  17
  18 /*! \file
  19  *
  20  * \brief Tone Management
  21  *
  22  * \author Pauline Middelink <middelink@polyware.nl>
  23  *
  24  * This set of function allow us to play a list of tones on a channel.
  25  * Each element has two frequencies, which are mixed together and a
  26  * duration. For silence both frequencies can be set to 0.
  27  * The playtones can be given as a comma separated string.
  28  *
  29  */
  30
  31 #include "asterisk.h"
  32
  33 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  34
  35 #include <math.h>
  36
  37 #include "asterisk/lock.h"
  38 #include "asterisk/linkedlists.h"
  39 #include "asterisk/indications.h"
  40 #include "asterisk/frame.h"
  41 #include "asterisk/channel.h"
  42 #include "asterisk/utils.h"
  43
  44 static int midi_tohz[128] = {
  45                         8,8,9,9,10,10,11,12,12,13,14,
  46                         15,16,17,18,19,20,21,23,24,25,
  47                         27,29,30,32,34,36,38,41,43,46,
  48                         48,51,55,58,61,65,69,73,77,82,
  49                         87,92,97,103,110,116,123,130,138,146,
  50                         155,164,174,184,195,207,220,233,246,261,
  51                         277,293,311,329,349,369,391,415,440,466,
  52                         493,523,554,587,622,659,698,739,783,830,
  53                         880,932,987,1046,1108,1174,1244,1318,1396,1479,
  54                         1567,1661,1760,1864,1975,2093,2217,2349,2489,2637,
  55                         2793,2959,3135,3322,3520,3729,3951,4186,4434,4698,
  56                         4978,5274,5587,5919,6271,6644,7040,7458,7902,8372,
  57                         8869,9397,9956,10548,11175,11839,12543
  58                         };
  59
  60 struct playtones_item {
  61         int fac1;
  62         int init_v2_1;
  63         int init_v3_1;
  64         int fac2;
  65         int init_v2_2;
  66         int init_v3_2;
  67         int modulate;
  68         int duration;
  69 };
  70
  71 struct playtones_def {
  72         int vol;
  73         int reppos;
  74         int nitems;
  75         int interruptible;
  76         struct playtones_item *items;
  77 };
  78
  79 struct playtones_state {
  80         int vol;
  81         int v1_1;
  82         int v2_1;
  83         int v3_1;
  84         int v1_2;
  85         int v2_2;
  86         int v3_2;
  87         int reppos;
  88         int nitems;
  89         struct playtones_item *items;
  90         int npos;
  91         int oldnpos;
  92         int pos;
  93         int origwfmt;
  94         struct ast_frame f;
  95         unsigned char offset[AST_FRIENDLY_OFFSET];
  96         short data[4000];
  97 };
  98
  99 static void playtones_release(struct ast_channel *chan, void *params)
 100 {
 101         struct playtones_state *ps = params;
 102
 103         if (chan)
 104                 ast_set_write_format(chan, ps->origwfmt);
 105         if (ps->items)
 106                 ast_free(ps->items);
 107
 108         ast_free(ps);
 109 }
 110
 111 static void * playtones_alloc(struct ast_channel *chan, void *params)
 112 {
 113         struct playtones_def *pd = params;
 114         struct playtones_state *ps = NULL;
 115
 116         if (!(ps = ast_calloc(1, sizeof(*ps))))
 117                 return NULL;
 118
 119         ps->origwfmt = chan->writeformat;
 120
 121         if (ast_set_write_format(chan, AST_FORMAT_SLINEAR)) {
 122                 ast_log(LOG_WARNING, "Unable to set '%s' to signed linear format (write)\n", chan->name);
 123                 playtones_release(NULL, ps);
 124                 ps = NULL;
 125         } else {
 126                 ps->vol = pd->vol;
 127                 ps->reppos = pd->reppos;
 128                 ps->nitems = pd->nitems;
 129                 ps->items = pd->items;
 130                 ps->oldnpos = -1;
 131         }
 132
 133         /* Let interrupts interrupt :) */
 134         if (pd->interruptible)
 135                 ast_set_flag(chan, AST_FLAG_WRITE_INT);
 136         else
 137                 ast_clear_flag(chan, AST_FLAG_WRITE_INT);
 138
 139         return ps;
 140 }
 141
 142 static int playtones_generator(struct ast_channel *chan, void *data, int len, int samples)
 143 {
 144         struct playtones_state *ps = data;
 145         struct playtones_item *pi;
 146         int x;
 147         /* we need to prepare a frame with 16 * timelen samples as we're
 148          * generating SLIN audio
 149          */
 150         len = samples * 2;
 151         if (len > sizeof(ps->data) / 2 - 1) {
 152                 ast_log(LOG_WARNING, "Can't generate that much data!\n");
 153                 return -1;
 154         }
 155         memset(&ps->f, 0, sizeof(ps->f));
 156
 157         pi = &ps->items[ps->npos];
 158         if (ps->oldnpos != ps->npos) {
 159                 /* Load new parameters */
 160                 ps->v1_1 = 0;
 161                 ps->v2_1 = pi->init_v2_1;
 162                 ps->v3_1 = pi->init_v3_1;
 163                 ps->v1_2 = 0;
 164                 ps->v2_2 = pi->init_v2_2;
 165                 ps->v3_2 = pi->init_v3_2;
 166                 ps->oldnpos = ps->npos;
 167         }
 168         for (x = 0; x < len/2; x++) {
 169                 ps->v1_1 = ps->v2_1;
 170                 ps->v2_1 = ps->v3_1;
 171                 ps->v3_1 = (pi->fac1 * ps->v2_1 >> 15) - ps->v1_1;
 172
 173                 ps->v1_2 = ps->v2_2;
 174                 ps->v2_2 = ps->v3_2;
 175                 ps->v3_2 = (pi->fac2 * ps->v2_2 >> 15) - ps->v1_2;
 176                 if (pi->modulate) {
 177                         int p;
 178                         p = ps->v3_2 - 32768;
 179                         if (p < 0) p = -p;
 180                         p = ((p * 9) / 10) + 1;
 181                         ps->data[x] = (ps->v3_1 * p) >> 15;
 182                 } else
 183                         ps->data[x] = ps->v3_1 + ps->v3_2;
 184         }
 185
 186         ps->f.frametype = AST_FRAME_VOICE;
 187         ps->f.subclass = AST_FORMAT_SLINEAR;
 188         ps->f.datalen = len;
 189         ps->f.samples = samples;
 190         ps->f.offset = AST_FRIENDLY_OFFSET;
 191         ps->f.data = ps->data;
 192         ps->f.delivery.tv_sec = 0;
 193         ps->f.delivery.tv_usec = 0;
 194         ast_write(chan, &ps->f);
 195
 196         ps->pos += x;
 197         if (pi->duration && ps->pos >= pi->duration * 8) {      /* item finished? */
 198                 ps->pos = 0;                                    /* start new item */
 199                 ps->npos++;
 200                 if (ps->npos >= ps->nitems) {                   /* last item? */
 201                         if (ps->reppos == -1)                   /* repeat set? */
 202                                 return -1;
 203                         ps->npos = ps->reppos;                  /* redo from top */
 204                 }
 205         }
 206         return 0;
 207 }
 208
 209 static struct ast_generator playtones = {
 210         alloc: playtones_alloc,
 211         release: playtones_release,
 212         generate: playtones_generator,
 213 };
 214
 215 int ast_playtones_start(struct ast_channel *chan, int vol, const char *playlst, int interruptible)
 216 {
 217         char *s, *data = ast_strdupa(playlst); /* cute */
 218         struct playtones_def d = { vol, -1, 0, 1, NULL};
 219         char *stringp;
 220         char *separator;
 221
 222         if (vol < 1)
 223                 d.vol = 7219; /* Default to -8db */
 224
 225         d.interruptible = interruptible;
 226
 227         stringp=data;
 228         /* the stringp/data is not null here */
 229         /* check if the data is separated with '|' or with ',' by default */
 230         if (strchr(stringp,'|'))
 231                 separator = "|";
 232         else
 233                 separator = ",";
 234         s = strsep(&stringp,separator);
 235         while (s && *s) {
 236                 int freq1, freq2, time, modulate = 0, midinote = 0;
 237
 238                 if (s[0]=='!')
 239                         s++;
 240                 else if (d.reppos == -1)
 241                         d.reppos = d.nitems;
 242                 if (sscanf(s, "%d+%d/%d", &freq1, &freq2, &time) == 3) {
 243                         /* f1+f2/time format */
 244                 } else if (sscanf(s, "%d+%d", &freq1, &freq2) == 2) {
 245                         /* f1+f2 format */
 246                         time = 0;
 247                 } else if (sscanf(s, "%d*%d/%d", &freq1, &freq2, &time) == 3) {
 248                         /* f1*f2/time format */
 249                         modulate = 1;
 250                 } else if (sscanf(s, "%d*%d", &freq1, &freq2) == 2) {
 251                         /* f1*f2 format */
 252                         time = 0;
 253                         modulate = 1;
 254                 } else if (sscanf(s, "%d/%d", &freq1, &time) == 2) {
 255                         /* f1/time format */
 256                         freq2 = 0;
 257                 } else if (sscanf(s, "%d", &freq1) == 1) {
 258                         /* f1 format */
 259                         freq2 = 0;
 260                         time = 0;
 261                 } else if (sscanf(s, "M%d+M%d/%d", &freq1, &freq2, &time) == 3) {
 262                         /* Mf1+Mf2/time format */
 263                         midinote = 1;
 264                 } else if (sscanf(s, "M%d+M%d", &freq1, &freq2) == 2) {
 265                         /* Mf1+Mf2 format */
 266                         time = 0;
 267                         midinote = 1;
 268                 } else if (sscanf(s, "M%d*M%d/%d", &freq1, &freq2, &time) == 3) {
 269                         /* Mf1*Mf2/time format */
 270                         modulate = 1;
 271                         midinote = 1;
 272                 } else if (sscanf(s, "M%d*M%d", &freq1, &freq2) == 2) {
 273                         /* Mf1*Mf2 format */
 274                         time = 0;
 275                         modulate = 1;
 276                         midinote = 1;
 277                 } else if (sscanf(s, "M%d/%d", &freq1, &time) == 2) {
 278                         /* Mf1/time format */
 279                         freq2 = -1;
 280                         midinote = 1;
 281                 } else if (sscanf(s, "M%d", &freq1) == 1) {
 282                         /* Mf1 format */
 283                         freq2 = -1;
 284                         time = 0;
 285                         midinote = 1;
 286                 } else {
 287                         ast_log(LOG_WARNING,"%s: tone component '%s' of '%s' is no good\n",chan->name,s,playlst);
 288                         return -1;
 289                 }
 290
 291                 if (midinote) {
 292                         /* midi notes must be between 0 and 127 */
 293                         if ((freq1 >= 0) && (freq1 <= 127))
 294                                 freq1 = midi_tohz[freq1];
 295                         else
 296                                 freq1 = 0;
 297
 298                         if ((freq2 >= 0) && (freq2 <= 127))
 299                                 freq2 = midi_tohz[freq2];
 300                         else
 301                                 freq2 = 0;
 302                 }
 303
 304                 if (!(d.items = ast_realloc(d.items, (d.nitems + 1) * sizeof(*d.items)))) {
 305                         return -1;
 306                 }
 307                 d.items[d.nitems].fac1 = 2.0 * cos(2.0 * M_PI * (freq1 / 8000.0)) * 32768.0;
 308                 d.items[d.nitems].init_v2_1 = sin(-4.0 * M_PI * (freq1 / 8000.0)) * d.vol;
 309                 d.items[d.nitems].init_v3_1 = sin(-2.0 * M_PI * (freq1 / 8000.0)) * d.vol;
 310
 311                 d.items[d.nitems].fac2 = 2.0 * cos(2.0 * M_PI * (freq2 / 8000.0)) * 32768.0;
 312                 d.items[d.nitems].init_v2_2 = sin(-4.0 * M_PI * (freq2 / 8000.0)) * d.vol;
 313                 d.items[d.nitems].init_v3_2 = sin(-2.0 * M_PI * (freq2 / 8000.0)) * d.vol;
 314                 d.items[d.nitems].duration = time;
 315                 d.items[d.nitems].modulate = modulate;
 316                 d.nitems++;
 317
 318                 s = strsep(&stringp,separator);
 319         }
 320
 321         if (ast_activate_generator(chan, &playtones, &d)) {
 322                 ast_free(d.items);
 323                 return -1;
 324         }
 325         return 0;
 326 }
 327
 328 void ast_playtones_stop(struct ast_channel *chan)
 329 {
 330         ast_deactivate_generator(chan);
 331 }
 332
 333 /*--------------------------------------------*/
 334
 335 static AST_RWLIST_HEAD_STATIC(tone_zones, ind_tone_zone);
 336 static struct ind_tone_zone *current_tonezone;
 337
 338 struct ind_tone_zone *ast_walk_indications(const struct ind_tone_zone *cur)
 339 {
 340         struct ind_tone_zone *tz = NULL;
 341
 342         AST_RWLIST_RDLOCK(&tone_zones);
 343         /* If cur is not NULL, then we have to iterate through - otherwise just return the first entry */
 344         if (cur) {
 345                 AST_RWLIST_TRAVERSE(&tone_zones, tz, list) {
 346                         if (tz == cur)
 347                                 break;
 348                 }
 349                 tz = AST_RWLIST_NEXT(tz, list);
 350         } else {
 351                 tz = AST_RWLIST_FIRST(&tone_zones);
 352         }
 353         AST_RWLIST_UNLOCK(&tone_zones);
 354
 355         return tz;
 356 }
 357
 358 /* Set global indication country */
 359 int ast_set_indication_country(const char *country)
 360 {
 361         struct ind_tone_zone *zone = NULL;
 362
 363         /* If no country is specified or we are unable to find the zone, then return not found */
 364         if (!country || !(zone = ast_get_indication_zone(country)))
 365                 return 1;
 366
 367         ast_verb(3, "Setting default indication country to '%s'\n", country);
 368
 369         /* Protect the current tonezone using the tone_zones lock as well */
 370         AST_RWLIST_WRLOCK(&tone_zones);
 371         current_tonezone = zone;
 372         AST_RWLIST_UNLOCK(&tone_zones);
 373
 374         /* Zone was found */
 375         return 0;
 376 }
 377
 378 /* locate tone_zone, given the country. if country == NULL, use the default country */
 379 struct ind_tone_zone *ast_get_indication_zone(const char *country)
 380 {
 381         struct ind_tone_zone *tz = NULL;
 382         int alias_loop = 0;
 383
 384         AST_RWLIST_RDLOCK(&tone_zones);
 385
 386         if (!country) {
 387                 if (current_tonezone)
 388                         tz = current_tonezone;
 389                 else
 390                         tz = AST_LIST_FIRST(&tone_zones);
 391         } else {
 392                 do {
 393                         AST_RWLIST_TRAVERSE(&tone_zones, tz, list) {
 394                                 if (!strcasecmp(tz->country, country))
 395                                         break;
 396                         }
 397                         if (!tz)
 398                                 break;
 399                         /* If this is an alias then we have to search yet again otherwise we have found the zonezone */
 400                         if (tz->alias && tz->alias[0])
 401                                 country = tz->alias;
 402                         else
 403                                 break;
 404                 } while ((++alias_loop < 20) && tz);
 405         }
 406
 407         AST_RWLIST_UNLOCK(&tone_zones);
 408
 409         /* If we reached the maximum loops to find the proper country via alias, print out a notice */
 410         if (alias_loop == 20)
 411                 ast_log(LOG_NOTICE, "Alias loop for '%s' is bonkers\n", country);
 412
 413         return tz;
 414 }
 415
 416 /* locate a tone_zone_sound, given the tone_zone. if tone_zone == NULL, use the default tone_zone */
 417 struct ind_tone_zone_sound *ast_get_indication_tone(const struct ind_tone_zone *zone, const char *indication)
 418 {
 419         struct ind_tone_zone_sound *ts = NULL;
 420
 421         AST_RWLIST_RDLOCK(&tone_zones);
 422
 423         /* If no zone is already specified we need to try to pick one */
 424         if (!zone) {
 425                 if (current_tonezone) {
 426                         zone = current_tonezone;
 427                 } else if (!(zone = AST_LIST_FIRST(&tone_zones))) {
 428                         /* No zone has been found ;( */
 429                         AST_RWLIST_UNLOCK(&tone_zones);
 430                         return NULL;
 431                 }
 432         }
 433
 434         /* Look through list of tones in the zone searching for the right one */
 435         for (ts = zone->tones; ts; ts = ts->next) {
 436                 if (!strcasecmp(ts->name, indication))
 437                         break;
 438         }
 439
 440         AST_RWLIST_UNLOCK(&tone_zones);
 441
 442         return ts;
 443 }
 444
 445 /* helper function to delete a tone_zone in its entirety */
 446 static inline void free_zone(struct ind_tone_zone* zone)
 447 {
 448         while (zone->tones) {
 449                 struct ind_tone_zone_sound *tmp = zone->tones->next;
 450                 ast_free((void *)zone->tones->name);
 451                 ast_free((void *)zone->tones->data);
 452                 ast_free(zone->tones);
 453                 zone->tones = tmp;
 454         }
 455
 456         if (zone->ringcadence)
 457                 ast_free(zone->ringcadence);
 458
 459         ast_free(zone);
 460 }
 461
 462 /*--------------------------------------------*/
 463
 464 /* add a new country, if country exists, it will be replaced. */
 465 int ast_register_indication_country(struct ind_tone_zone *zone)
 466 {
 467         struct ind_tone_zone *tz = NULL;
 468
 469         AST_RWLIST_WRLOCK(&tone_zones);
 470         AST_RWLIST_TRAVERSE_SAFE_BEGIN(&tone_zones, tz, list) {
 471                 /* If this is not the same zone, then just continue to the next entry */
 472                 if (strcasecmp(zone->country, tz->country))
 473                         continue;
 474                 /* If this zone we are going to remove is the current default then make the new zone the default */
 475                 if (tz == current_tonezone)
 476                         current_tonezone = zone;
 477                 /* Remove from the linked list */
 478                 AST_RWLIST_REMOVE_CURRENT(list);
 479                 /* Finally free the zone itself */
 480                 free_zone(tz);
 481                 break;
 482         }
 483         AST_RWLIST_TRAVERSE_SAFE_END;
 484
 485         /* Add zone to the list */
 486         AST_RWLIST_INSERT_TAIL(&tone_zones, zone, list);
 487
 488         /* It's all over. */
 489         AST_RWLIST_UNLOCK(&tone_zones);
 490
 491         ast_verb(3, "Registered indication country '%s'\n", zone->country);
 492
 493         return 0;
 494 }
 495
 496 /* remove an existing country and all its indications, country must exist.
 497  * Also, all countries which are an alias for the specified country are removed. */
 498 int ast_unregister_indication_country(const char *country)
 499 {
 500         struct ind_tone_zone *tz = NULL;
 501         int res = -1;
 502
 503         AST_RWLIST_WRLOCK(&tone_zones);
 504         AST_RWLIST_TRAVERSE_SAFE_BEGIN(&tone_zones, tz, list) {
 505                 if (country && (strcasecmp(country, tz->country) && strcasecmp(country, tz->alias)))
 506                         continue;
 507                 /* If this tonezone is the current default then unset it */
 508                 if (tz == current_tonezone) {
 509                         ast_log(LOG_NOTICE,"Removed default indication country '%s'\n", tz->country);
 510                         current_tonezone = NULL;
 511                 }
 512                 /* Remove from the list */
 513                 AST_RWLIST_REMOVE_CURRENT(list);
 514                 ast_verb(3, "Unregistered indication country '%s'\n", tz->country);
 515                 free_zone(tz);
 516                 res = 0;
 517         }
 518         AST_RWLIST_TRAVERSE_SAFE_END;
 519         AST_RWLIST_UNLOCK(&tone_zones);
 520
 521         return res;
 522 }
 523
 524 /* add a new indication to a tone_zone. tone_zone must exist. if the indication already
 525  * exists, it will be replaced. */
 526 int ast_register_indication(struct ind_tone_zone *zone, const char *indication, const char *tonelist)
 527 {
 528         struct ind_tone_zone_sound *ts, *ps;
 529
 530         /* is it an alias? stop */
 531         if (zone->alias[0])
 532                 return -1;
 533
 534         AST_RWLIST_WRLOCK(&tone_zones);
 535         for (ps=NULL,ts=zone->tones; ts; ps=ts,ts=ts->next) {
 536                 if (!strcasecmp(indication,ts->name)) {
 537                         /* indication already there, replace */
 538                         ast_free((void*)ts->name);
 539                         ast_free((void*)ts->data);
 540                         break;
 541                 }
 542         }
 543         if (!ts) {
 544                 /* not there, we have to add */
 545                 if (!(ts = ast_malloc(sizeof(*ts)))) {
 546                         AST_RWLIST_UNLOCK(&tone_zones);
 547                         return -2;
 548                 }
 549                 ts->next = NULL;
 550         }
 551         if (!(ts->name = ast_strdup(indication)) || !(ts->data = ast_strdup(tonelist))) {
 552                 AST_RWLIST_UNLOCK(&tone_zones);
 553                 return -2;
 554         }
 555         if (ps)
 556                 ps->next = ts;
 557         else
 558                 zone->tones = ts;
 559         AST_RWLIST_UNLOCK(&tone_zones);
 560         return 0;
 561 }
 562
 563 /* remove an existing country's indication. Both country and indication must exist */
 564 int ast_unregister_indication(struct ind_tone_zone *zone, const char *indication)
 565 {
 566         struct ind_tone_zone_sound *ts,*ps = NULL, *tmp;
 567         int res = -1;
 568
 569         /* is it an alias? stop */
 570         if (zone->alias[0])
 571                 return -1;
 572
 573         AST_RWLIST_WRLOCK(&tone_zones);
 574         ts = zone->tones;
 575         while (ts) {
 576                 if (!strcasecmp(indication,ts->name)) {
 577                         /* indication found */
 578                         tmp = ts->next;
 579                         if (ps)
 580                                 ps->next = tmp;
 581                         else
 582                                 zone->tones = tmp;
 583                         ast_free((void*)ts->name);
 584                         ast_free((void*)ts->data);
 585                         ast_free(ts);
 586                         ts = tmp;
 587                         res = 0;
 588                 }
 589                 else {
 590                         /* next zone please */
 591                         ps = ts;
 592                         ts = ts->next;
 593                 }
 594         }
 595         /* indication not found, goodbye */
 596         AST_RWLIST_UNLOCK(&tone_zones);
 597         return res;
 598 }