main/bridging.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 2007 - 2009, Digium, Inc.
   5  *
   6  * Joshua Colp <jcolp@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  *
  21  * \brief Channel Bridging API
  22  *
  23  * \author Joshua Colp <jcolp@digium.com>
  24  */
  25
  26 /*** MODULEINFO
  27         <support_level>core</support_level>
  28  ***/
  29
  30 #include "asterisk.h"
  31
  32 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  33
  34 #include <signal.h>
  35
  36 #include "asterisk/logger.h"
  37 #include "asterisk/channel.h"
  38 #include "asterisk/options.h"
  39 #include "asterisk/utils.h"
  40 #include "asterisk/lock.h"
  41 #include "asterisk/linkedlists.h"
  42 #include "asterisk/bridging.h"
  43 #include "asterisk/bridging_technology.h"
  44 #include "asterisk/app.h"
  45 #include "asterisk/file.h"
  46 #include "asterisk/module.h"
  47 #include "asterisk/astobj2.h"
  48 #include "asterisk/test.h"
  49
  50 static AST_RWLIST_HEAD_STATIC(bridge_technologies, ast_bridge_technology);
  51
  52 /* Initial starting point for the bridge array of channels */
  53 #define BRIDGE_ARRAY_START 128
  54
  55 /* Grow rate of bridge array of channels */
  56 #define BRIDGE_ARRAY_GROW 32
  57
  58 static void cleanup_video_mode(struct ast_bridge *bridge);
  59
  60 /*! Default DTMF keys for built in features */
  61 static char builtin_features_dtmf[AST_BRIDGE_BUILTIN_END][MAXIMUM_DTMF_FEATURE_STRING];
  62
  63 /*! Function handlers for the built in features */
  64 static void *builtin_features_handlers[AST_BRIDGE_BUILTIN_END];
  65
  66 int __ast_bridge_technology_register(struct ast_bridge_technology *technology, struct ast_module *module)
  67 {
  68         struct ast_bridge_technology *current = NULL;
  69
  70         /* Perform a sanity check to make sure the bridge technology conforms to our needed requirements */
  71         if (ast_strlen_zero(technology->name) || !technology->capabilities || !technology->write) {
  72                 ast_log(LOG_WARNING, "Bridge technology %s failed registration sanity check.\n", technology->name);
  73                 return -1;
  74         }
  75
  76         AST_RWLIST_WRLOCK(&bridge_technologies);
  77
  78         /* Look for duplicate bridge technology already using this name, or already registered */
  79         AST_RWLIST_TRAVERSE(&bridge_technologies, current, entry) {
  80                 if ((!strcasecmp(current->name, technology->name)) || (current == technology)) {
  81                         ast_log(LOG_WARNING, "A bridge technology of %s already claims to exist in our world.\n", technology->name);
  82                         AST_RWLIST_UNLOCK(&bridge_technologies);
  83                         return -1;
  84                 }
  85         }
  86
  87         /* Copy module pointer so reference counting can keep the module from unloading */
  88         technology->mod = module;
  89
  90         /* Insert our new bridge technology into the list and print out a pretty message */
  91         AST_RWLIST_INSERT_TAIL(&bridge_technologies, technology, entry);
  92
  93         AST_RWLIST_UNLOCK(&bridge_technologies);
  94
  95         ast_verb(2, "Registered bridge technology %s\n", technology->name);
  96
  97         return 0;
  98 }
  99
 100 int ast_bridge_technology_unregister(struct ast_bridge_technology *technology)
 101 {
 102         struct ast_bridge_technology *current = NULL;
 103
 104         AST_RWLIST_WRLOCK(&bridge_technologies);
 105
 106         /* Ensure the bridge technology is registered before removing it */
 107         AST_RWLIST_TRAVERSE_SAFE_BEGIN(&bridge_technologies, current, entry) {
 108                 if (current == technology) {
 109                         AST_RWLIST_REMOVE_CURRENT(entry);
 110                         ast_verb(2, "Unregistered bridge technology %s\n", technology->name);
 111                         break;
 112                 }
 113         }
 114         AST_RWLIST_TRAVERSE_SAFE_END;
 115
 116         AST_RWLIST_UNLOCK(&bridge_technologies);
 117
 118         return current ? 0 : -1;
 119 }
 120
 121 void ast_bridge_change_state(struct ast_bridge_channel *bridge_channel, enum ast_bridge_channel_state new_state)
 122 {
 123         /* Change the state on the bridge channel */
 124         bridge_channel->state = new_state;
 125
 126         /* Only poke the channel's thread if it is not us */
 127         if (!pthread_equal(pthread_self(), bridge_channel->thread)) {
 128                 pthread_kill(bridge_channel->thread, SIGURG);
 129                 ao2_lock(bridge_channel);
 130                 ast_cond_signal(&bridge_channel->cond);
 131                 ao2_unlock(bridge_channel);
 132         }
 133
 134         return;
 135 }
 136
 137 /*! \brief Helper function to poke the bridge thread */
 138 static void bridge_poke(struct ast_bridge *bridge)
 139 {
 140         /* Poke the thread just in case */
 141         if (bridge->thread != AST_PTHREADT_NULL && bridge->thread != AST_PTHREADT_STOP) {
 142                 pthread_kill(bridge->thread, SIGURG);
 143         }
 144
 145         return;
 146 }
 147
 148 /*! \brief Helper function to add a channel to the bridge array
 149  *
 150  * \note This function assumes the bridge is locked.
 151  */
 152 static void bridge_array_add(struct ast_bridge *bridge, struct ast_channel *chan)
 153 {
 154         /* We have to make sure the bridge thread is not using the bridge array before messing with it */
 155         while (bridge->waiting) {
 156                 bridge_poke(bridge);
 157                 sched_yield();
 158         }
 159
 160         bridge->array[bridge->array_num++] = chan;
 161
 162         ast_debug(1, "Added channel %s(%p) to bridge array on %p, new count is %d\n", ast_channel_name(chan), chan, bridge, (int)bridge->array_num);
 163
 164         /* If the next addition of a channel will exceed our array size grow it out */
 165         if (bridge->array_num == bridge->array_size) {
 166                 struct ast_channel **tmp;
 167                 ast_debug(1, "Growing bridge array on %p from %d to %d\n", bridge, (int)bridge->array_size, (int)bridge->array_size + BRIDGE_ARRAY_GROW);
 168                 if (!(tmp = ast_realloc(bridge->array, (bridge->array_size + BRIDGE_ARRAY_GROW) * sizeof(struct ast_channel *)))) {
 169                         ast_log(LOG_ERROR, "Failed to allocate more space for another channel on bridge '%p', this is not going to end well\n", bridge);
 170                         return;
 171                 }
 172                 bridge->array = tmp;
 173                 bridge->array_size += BRIDGE_ARRAY_GROW;
 174         }
 175
 176         return;
 177 }
 178
 179 /*! \brief Helper function to remove a channel from the bridge array
 180  *
 181  * \note This function assumes the bridge is locked.
 182  */
 183 static void bridge_array_remove(struct ast_bridge *bridge, struct ast_channel *chan)
 184 {
 185         int i;
 186
 187         /* We have to make sure the bridge thread is not using the bridge array before messing with it */
 188         while (bridge->waiting) {
 189                 bridge_poke(bridge);
 190                 sched_yield();
 191         }
 192
 193         for (i = 0; i < bridge->array_num; i++) {
 194                 if (bridge->array[i] == chan) {
 195                         bridge->array[i] = (bridge->array[(bridge->array_num - 1)] != chan ? bridge->array[(bridge->array_num - 1)] : NULL);
 196                         bridge->array[(bridge->array_num - 1)] = NULL;
 197                         bridge->array_num--;
 198                         ast_debug(1, "Removed channel %p from bridge array on %p, new count is %d\n", chan, bridge, (int)bridge->array_num);
 199                         break;
 200                 }
 201         }
 202
 203         return;
 204 }
 205
 206 /*! \brief Helper function to find a bridge channel given a channel */
 207 static struct ast_bridge_channel *find_bridge_channel(struct ast_bridge *bridge, struct ast_channel *chan)
 208 {
 209         struct ast_bridge_channel *bridge_channel = NULL;
 210
 211         AST_LIST_TRAVERSE(&bridge->channels, bridge_channel, entry) {
 212                 if (bridge_channel->chan == chan) {
 213                         break;
 214                 }
 215         }
 216
 217         return bridge_channel;
 218 }
 219
 220 /*! \brief Internal function to see whether a bridge should dissolve, and if so do it */
 221 static void bridge_check_dissolve(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
 222 {
 223         struct ast_bridge_channel *bridge_channel2 = NULL;
 224
 225         if (!ast_test_flag(&bridge->feature_flags, AST_BRIDGE_FLAG_DISSOLVE) && (!bridge_channel->features || !bridge_channel->features->usable || !ast_test_flag(&bridge_channel->features->feature_flags, AST_BRIDGE_FLAG_DISSOLVE))) {
 226                 return;
 227         }
 228
 229         ast_debug(1, "Dissolving bridge %p\n", bridge);
 230
 231         AST_LIST_TRAVERSE(&bridge->channels, bridge_channel2, entry) {
 232                 if (bridge_channel2->state != AST_BRIDGE_CHANNEL_STATE_END && bridge_channel2->state != AST_BRIDGE_CHANNEL_STATE_DEPART) {
 233                         ast_bridge_change_state(bridge_channel2, AST_BRIDGE_CHANNEL_STATE_HANGUP);
 234                 }
 235         }
 236
 237         /* Since all the channels are going away let's go ahead and stop our on thread */
 238         bridge->stop = 1;
 239
 240         return;
 241 }
 242
 243 /*! \brief Internal function to handle DTMF from a channel */
 244 static struct ast_frame *bridge_handle_dtmf(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
 245 {
 246         struct ast_bridge_features *features = (bridge_channel->features ? bridge_channel->features : &bridge->features);
 247         struct ast_bridge_features_hook *hook = NULL;
 248
 249         /* If the features structure we grabbed is not usable immediately return the frame */
 250         if (!features->usable) {
 251                 return frame;
 252         }
 253
 254         /* See if this DTMF matches the beginnings of any feature hooks, if so we switch to the feature state to either execute the feature or collect more DTMF */
 255         AST_LIST_TRAVERSE(&features->hooks, hook, entry) {
 256                 if (hook->dtmf[0] == frame->subclass.integer) {
 257                         ast_frfree(frame);
 258                         frame = NULL;
 259                         ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_FEATURE);
 260                         break;
 261                 }
 262         }
 263
 264         return frame;
 265 }
 266
 267 /*! \brief Internal function used to determine whether a control frame should be dropped or not */
 268 static int bridge_drop_control_frame(int subclass)
 269 {
 270         switch (subclass) {
 271         case AST_CONTROL_ANSWER:
 272         case -1:
 273                 return 1;
 274         default:
 275                 return 0;
 276         }
 277 }
 278
 279 void ast_bridge_notify_talking(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, int started_talking)
 280 {
 281         if (started_talking) {
 282                 ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_START_TALKING);
 283         } else {
 284                 ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_STOP_TALKING);
 285         }
 286 }
 287
 288 void ast_bridge_handle_trip(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_channel *chan, int outfd)
 289 {
 290         /* If no bridge channel has been provided and the actual channel has been provided find it */
 291         if (chan && !bridge_channel) {
 292                 bridge_channel = find_bridge_channel(bridge, chan);
 293         }
 294
 295         /* If a bridge channel with actual channel is present read a frame and handle it */
 296         if (chan && bridge_channel) {
 297                 struct ast_frame *frame = (((bridge->features.mute) || (bridge_channel->features && bridge_channel->features->mute)) ? ast_read_noaudio(chan) : ast_read(chan));
 298
 299                 /* This is pretty simple... see if they hung up */
 300                 if (!frame || (frame->frametype == AST_FRAME_CONTROL && frame->subclass.integer == AST_CONTROL_HANGUP)) {
 301                         /* Signal the thread that is handling the bridged channel that it should be ended */
 302                         ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_END);
 303                 } else if (frame->frametype == AST_FRAME_CONTROL && bridge_drop_control_frame(frame->subclass.integer)) {
 304                         ast_debug(1, "Dropping control frame from bridge channel %p\n", bridge_channel);
 305                 } else if (frame->frametype == AST_FRAME_DTMF_BEGIN || frame->frametype == AST_FRAME_DTMF_END) {
 306                         int dtmf_passthrough = bridge_channel->features ?
 307                                 bridge_channel->features->dtmf_passthrough :
 308                                 bridge->features.dtmf_passthrough;
 309
 310                         if (frame->frametype == AST_FRAME_DTMF_BEGIN) {
 311                                 frame = bridge_handle_dtmf(bridge, bridge_channel, frame);
 312                         }
 313
 314                         if (frame && dtmf_passthrough) {
 315                                 bridge->technology->write(bridge, bridge_channel, frame);
 316                         }
 317                 } else {
 318                         /* Simply write the frame out to the bridge technology if it still exists */
 319                         bridge->technology->write(bridge, bridge_channel, frame);
 320                 }
 321
 322                 if (frame) {
 323                         ast_frfree(frame);
 324                 }
 325                 return;
 326         }
 327
 328         /* If a file descriptor actually tripped pass it off to the bridge technology */
 329         if (outfd > -1 && bridge->technology->fd) {
 330                 bridge->technology->fd(bridge, bridge_channel, outfd);
 331                 return;
 332         }
 333
 334         /* If all else fails just poke the bridge */
 335         if (bridge->technology->poke && bridge_channel) {
 336                 bridge->technology->poke(bridge, bridge_channel);
 337                 return;
 338         }
 339
 340         return;
 341 }
 342
 343 /*! \brief Generic thread loop, TODO: Rethink this/improve it */
 344 static int generic_thread_loop(struct ast_bridge *bridge)
 345 {
 346         while (!bridge->stop && !bridge->refresh && bridge->array_num) {
 347                 struct ast_channel *winner = NULL;
 348                 int to = -1;
 349
 350                 /* Move channels around for priority reasons if we have more than one channel in our array */
 351                 if (bridge->array_num > 1) {
 352                         struct ast_channel *first = bridge->array[0];
 353                         memmove(bridge->array, bridge->array + 1, sizeof(struct ast_channel *) * (bridge->array_num - 1));
 354                         bridge->array[(bridge->array_num - 1)] = first;
 355                 }
 356
 357                 /* Wait on the channels */
 358                 bridge->waiting = 1;
 359                 ao2_unlock(bridge);
 360                 winner = ast_waitfor_n(bridge->array, (int)bridge->array_num, &to);
 361                 bridge->waiting = 0;
 362                 ao2_lock(bridge);
 363
 364                 /* Process whatever they did */
 365                 ast_bridge_handle_trip(bridge, NULL, winner, -1);
 366         }
 367
 368         return 0;
 369 }
 370
 371 /*! \brief Bridge thread function */
 372 static void *bridge_thread(void *data)
 373 {
 374         struct ast_bridge *bridge = data;
 375         int res = 0;
 376
 377         ao2_lock(bridge);
 378
 379         ast_debug(1, "Started bridge thread for %p\n", bridge);
 380
 381         /* Loop around until we are told to stop */
 382         while (!bridge->stop && bridge->array_num && !res) {
 383                 /* In case the refresh bit was set simply set it back to off */
 384                 bridge->refresh = 0;
 385
 386                 ast_debug(1, "Launching bridge thread function %p for bridge %p\n", (bridge->technology->thread ? bridge->technology->thread : &generic_thread_loop), bridge);
 387
 388                 /* Execute the appropriate thread function. If the technology does not provide one we use the generic one */
 389                 res = (bridge->technology->thread ? bridge->technology->thread(bridge) : generic_thread_loop(bridge));
 390         }
 391
 392         ast_debug(1, "Ending bridge thread for %p\n", bridge);
 393
 394         /* Indicate the bridge thread is no longer active */
 395         bridge->thread = AST_PTHREADT_NULL;
 396         ao2_unlock(bridge);
 397
 398         ao2_ref(bridge, -1);
 399
 400         return NULL;
 401 }
 402
 403 /*! \brief Helper function used to find the "best" bridge technology given a specified capabilities */
 404 static struct ast_bridge_technology *find_best_technology(uint32_t capabilities)
 405 {
 406         struct ast_bridge_technology *current = NULL, *best = NULL;
 407
 408         AST_RWLIST_RDLOCK(&bridge_technologies);
 409         AST_RWLIST_TRAVERSE(&bridge_technologies, current, entry) {
 410                 if (current->suspended) {
 411                         ast_debug(1, "Bridge technology %s is suspended. Skipping.\n", current->name);
 412                         continue;
 413                 }
 414                 if (!(current->capabilities & capabilities)) {
 415                         ast_debug(1, "Bridge technology %s does not have the capabilities we need.\n", current->name);
 416                         continue;
 417                 }
 418                 if (best && best->preference < current->preference) {
 419                         ast_debug(1, "Bridge technology %s has preference %d while %s has preference %d. Skipping.\n", current->name, current->preference, best->name, best->preference);
 420                         continue;
 421                 }
 422                 best = current;
 423         }
 424
 425         if (best) {
 426                 /* Increment it's module reference count if present so it does not get unloaded while in use */
 427                 if (best->mod) {
 428                         ast_module_ref(best->mod);
 429                 }
 430                 ast_debug(1, "Chose bridge technology %s\n", best->name);
 431         }
 432
 433         AST_RWLIST_UNLOCK(&bridge_technologies);
 434
 435         return best;
 436 }
 437
 438 static void destroy_bridge(void *obj)
 439 {
 440         struct ast_bridge *bridge = obj;
 441
 442         ast_debug(1, "Actually destroying bridge %p, nobody wants it anymore\n", bridge);
 443
 444         /* Pass off the bridge to the technology to destroy if needed */
 445         if (bridge->technology->destroy) {
 446                 ast_debug(1, "Giving bridge technology %s the bridge structure %p to destroy\n", bridge->technology->name, bridge);
 447                 if (bridge->technology->destroy(bridge)) {
 448                         ast_debug(1, "Bridge technology %s failed to destroy bridge structure %p... trying our best\n", bridge->technology->name, bridge);
 449                 }
 450         }
 451
 452         /* We are no longer using the bridge technology so decrement the module reference count on it */
 453         if (bridge->technology->mod) {
 454                 ast_module_unref(bridge->technology->mod);
 455         }
 456
 457         /* Last but not least clean up the features configuration */
 458         ast_bridge_features_cleanup(&bridge->features);
 459
 460         /* Drop the array of channels */
 461         ast_free(bridge->array);
 462
 463         cleanup_video_mode(bridge);
 464
 465         return;
 466 }
 467
 468 struct ast_bridge *ast_bridge_new(uint32_t capabilities, int flags)
 469 {
 470         struct ast_bridge *bridge = NULL;
 471         struct ast_bridge_technology *bridge_technology = NULL;
 472
 473         /* If we need to be a smart bridge see if we can move between 1to1 and multimix bridges */
 474         if (flags & AST_BRIDGE_FLAG_SMART) {
 475                 struct ast_bridge *other_bridge;
 476
 477                 if (!(other_bridge = ast_bridge_new((capabilities & AST_BRIDGE_CAPABILITY_1TO1MIX) ? AST_BRIDGE_CAPABILITY_MULTIMIX : AST_BRIDGE_CAPABILITY_1TO1MIX, 0))) {
 478                         return NULL;
 479                 }
 480
 481                 ast_bridge_destroy(other_bridge);
 482         }
 483
 484         /* If capabilities were provided use our helper function to find the "best" bridge technology, otherwise we can
 485          * just look for the most basic capability needed, single 1to1 mixing. */
 486         bridge_technology = (capabilities ? find_best_technology(capabilities) : find_best_technology(AST_BRIDGE_CAPABILITY_1TO1MIX));
 487
 488         /* If no bridge technology was found we can't possibly do bridging so fail creation of the bridge */
 489         if (!bridge_technology) {
 490                 return NULL;
 491         }
 492
 493         /* We have everything we need to create this bridge... so allocate the memory, link things together, and fire her up! */
 494         if (!(bridge = ao2_alloc(sizeof(*bridge), destroy_bridge))) {
 495                 return NULL;
 496         }
 497
 498         bridge->technology = bridge_technology;
 499         bridge->thread = AST_PTHREADT_NULL;
 500
 501         /* Create an array of pointers for the channels that will be joining us */
 502         bridge->array = ast_calloc(BRIDGE_ARRAY_START, sizeof(struct ast_channel*));
 503         bridge->array_size = BRIDGE_ARRAY_START;
 504
 505         ast_set_flag(&bridge->feature_flags, flags);
 506
 507         /* Pass off the bridge to the technology to manipulate if needed */
 508         if (bridge->technology->create) {
 509                 ast_debug(1, "Giving bridge technology %s the bridge structure %p to setup\n", bridge->technology->name, bridge);
 510                 if (bridge->technology->create(bridge)) {
 511                         ast_debug(1, "Bridge technology %s failed to setup bridge structure %p\n", bridge->technology->name, bridge);
 512                         ao2_ref(bridge, -1);
 513                         bridge = NULL;
 514                 }
 515         }
 516
 517         return bridge;
 518 }
 519
 520 int ast_bridge_check(uint32_t capabilities)
 521 {
 522         struct ast_bridge_technology *bridge_technology = NULL;
 523
 524         if (!(bridge_technology = find_best_technology(capabilities))) {
 525                 return 0;
 526         }
 527
 528         ast_module_unref(bridge_technology->mod);
 529
 530         return 1;
 531 }
 532
 533 int ast_bridge_destroy(struct ast_bridge *bridge)
 534 {
 535         struct ast_bridge_channel *bridge_channel = NULL;
 536
 537         ao2_lock(bridge);
 538
 539         bridge->stop = 1;
 540
 541         bridge_poke(bridge);
 542
 543         ast_debug(1, "Telling all channels in bridge %p to end and leave the party\n", bridge);
 544
 545         /* Drop every bridged channel, the last one will cause the bridge thread (if it exists) to exit */
 546         AST_LIST_TRAVERSE(&bridge->channels, bridge_channel, entry) {
 547                 ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_END);
 548         }
 549
 550         ao2_unlock(bridge);
 551
 552         ao2_ref(bridge, -1);
 553
 554         return 0;
 555 }
 556
 557 static int bridge_make_compatible(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
 558 {
 559         struct ast_format formats[2];
 560         ast_format_copy(&formats[0], ast_channel_readformat(bridge_channel->chan));
 561         ast_format_copy(&formats[1], ast_channel_writeformat(bridge_channel->chan));
 562
 563         /* Are the formats currently in use something ths bridge can handle? */
 564         if (!ast_format_cap_iscompatible(bridge->technology->format_capabilities, ast_channel_readformat(bridge_channel->chan))) {
 565                 struct ast_format best_format;
 566                 ast_best_codec(bridge->technology->format_capabilities, &best_format);
 567
 568                 /* Read format is a no go... */
 569                 if (option_debug) {
 570                         char codec_buf[512];
 571                         ast_debug(1, "Bridge technology %s wants to read any of formats %s but channel has %s\n", bridge->technology->name,
 572                                 ast_getformatname_multiple(codec_buf, sizeof(codec_buf), bridge->technology->format_capabilities),
 573                                 ast_getformatname(&formats[0]));
 574                 }
 575                 /* Switch read format to the best one chosen */
 576                 if (ast_set_read_format(bridge_channel->chan, &best_format)) {
 577                         ast_log(LOG_WARNING, "Failed to set channel %s to read format %s\n", ast_channel_name(bridge_channel->chan), ast_getformatname(&best_format));
 578                         return -1;
 579                 }
 580                 ast_debug(1, "Bridge %p put channel %s into read format %s\n", bridge, ast_channel_name(bridge_channel->chan), ast_getformatname(&best_format));
 581         } else {
 582                 ast_debug(1, "Bridge %p is happy that channel %s already has read format %s\n", bridge, ast_channel_name(bridge_channel->chan), ast_getformatname(&formats[0]));
 583         }
 584
 585         if (!ast_format_cap_iscompatible(bridge->technology->format_capabilities, &formats[1])) {
 586                 struct ast_format best_format;
 587                 ast_best_codec(bridge->technology->format_capabilities, &best_format);
 588
 589                 /* Write format is a no go... */
 590                 if (option_debug) {
 591                         char codec_buf[512];
 592                         ast_debug(1, "Bridge technology %s wants to write any of formats %s but channel has %s\n", bridge->technology->name,
 593                                 ast_getformatname_multiple(codec_buf, sizeof(codec_buf), bridge->technology->format_capabilities),
 594                                 ast_getformatname(&formats[1]));
 595                 }
 596                 /* Switch write format to the best one chosen */
 597                 if (ast_set_write_format(bridge_channel->chan, &best_format)) {
 598                         ast_log(LOG_WARNING, "Failed to set channel %s to write format %s\n", ast_channel_name(bridge_channel->chan), ast_getformatname(&best_format));
 599                         return -1;
 600                 }
 601                 ast_debug(1, "Bridge %p put channel %s into write format %s\n", bridge, ast_channel_name(bridge_channel->chan), ast_getformatname(&best_format));
 602         } else {
 603                 ast_debug(1, "Bridge %p is happy that channel %s already has write format %s\n", bridge, ast_channel_name(bridge_channel->chan), ast_getformatname(&formats[1]));
 604         }
 605
 606         return 0;
 607 }
 608
 609 /*! \brief Perform the smart bridge operation. Basically sees if a new bridge technology should be used instead of the current one. */
 610 static int smart_bridge_operation(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, int count)
 611 {
 612         uint32_t new_capabilities = 0;
 613         struct ast_bridge_technology *new_technology = NULL, *old_technology = bridge->technology;
 614         struct ast_bridge temp_bridge = {
 615                 .technology = bridge->technology,
 616                 .bridge_pvt = bridge->bridge_pvt,
 617         };
 618         struct ast_bridge_channel *bridge_channel2 = NULL;
 619
 620         /* Based on current feature determine whether we want to change bridge technologies or not */
 621         if (bridge->technology->capabilities & AST_BRIDGE_CAPABILITY_1TO1MIX) {
 622                 if (count <= 2) {
 623                         ast_debug(1, "Bridge %p channel count (%d) is within limits for bridge technology %s, not performing smart bridge operation.\n", bridge, count, bridge->technology->name);
 624                         return 0;
 625                 }
 626                 new_capabilities = AST_BRIDGE_CAPABILITY_MULTIMIX;
 627         } else if (bridge->technology->capabilities & AST_BRIDGE_CAPABILITY_MULTIMIX) {
 628                 if (count > 2) {
 629                         ast_debug(1, "Bridge %p channel count (%d) is within limits for bridge technology %s, not performing smart bridge operation.\n", bridge, count, bridge->technology->name);
 630                         return 0;
 631                 }
 632                 new_capabilities = AST_BRIDGE_CAPABILITY_1TO1MIX;
 633         }
 634
 635         if (!new_capabilities) {
 636                 ast_debug(1, "Bridge '%p' has no new capabilities, not performing smart bridge operation.\n", bridge);
 637                 return 0;
 638         }
 639
 640         /* Attempt to find a new bridge technology to satisfy the capabilities */
 641         if (!(new_technology = find_best_technology(new_capabilities))) {
 642                 return -1;
 643         }
 644
 645         ast_debug(1, "Performing smart bridge operation on bridge %p, moving from bridge technology %s to %s\n", bridge, old_technology->name, new_technology->name);
 646
 647         /* If a thread is currently executing for the current technology tell it to stop */
 648         if (bridge->thread != AST_PTHREADT_NULL) {
 649                 /* If the new bridge technology also needs a thread simply tell the bridge thread to refresh itself. This has the benefit of not incurring the cost/time of tearing down and bringing up a new thread. */
 650                 if (new_technology->capabilities & AST_BRIDGE_CAPABILITY_THREAD) {
 651                         ast_debug(1, "Telling current bridge thread for bridge %p to refresh\n", bridge);
 652                         bridge->refresh = 1;
 653                         bridge_poke(bridge);
 654                 } else {
 655                         pthread_t bridge_thread = bridge->thread;
 656                         ast_debug(1, "Telling current bridge thread for bridge %p to stop\n", bridge);
 657                         bridge->stop = 1;
 658                         bridge_poke(bridge);
 659                         ao2_unlock(bridge);
 660                         pthread_join(bridge_thread, NULL);
 661                         ao2_lock(bridge);
 662                 }
 663         }
 664
 665         /* Since we are soon going to pass this bridge to a new technology we need to NULL out the bridge_pvt pointer but don't worry as it still exists in temp_bridge, ditto for the old technology */
 666         bridge->bridge_pvt = NULL;
 667         bridge->technology = new_technology;
 668
 669         /* Pass the bridge to the new bridge technology so it can set it up */
 670         if (new_technology->create) {
 671                 ast_debug(1, "Giving bridge technology %s the bridge structure %p to setup\n", new_technology->name, bridge);
 672                 if (new_technology->create(bridge)) {
 673                         ast_debug(1, "Bridge technology %s failed to setup bridge structure %p\n", new_technology->name, bridge);
 674                 }
 675         }
 676
 677         /* Move existing channels over to the new technology, while taking them away from the old one */
 678         AST_LIST_TRAVERSE(&bridge->channels, bridge_channel2, entry) {
 679                 /* Skip over channel that initiated the smart bridge operation */
 680                 if (bridge_channel == bridge_channel2) {
 681                         continue;
 682                 }
 683
 684                 /* First we part them from the old technology */
 685                 if (old_technology->leave) {
 686                         ast_debug(1, "Giving bridge technology %s notification that %p is leaving bridge %p (really %p)\n", old_technology->name, bridge_channel2, &temp_bridge, bridge);
 687                         if (old_technology->leave(&temp_bridge, bridge_channel2)) {
 688                                 ast_debug(1, "Bridge technology %s failed to allow %p (really %p) to leave bridge %p\n", old_technology->name, bridge_channel2, &temp_bridge, bridge);
 689                         }
 690                 }
 691
 692                 /* Second we make them compatible again with the bridge */
 693                 bridge_make_compatible(bridge, bridge_channel2);
 694
 695                 /* Third we join them to the new technology */
 696                 if (new_technology->join) {
 697                         ast_debug(1, "Giving bridge technology %s notification that %p is joining bridge %p\n", new_technology->name, bridge_channel2, bridge);
 698                         if (new_technology->join(bridge, bridge_channel2)) {
 699                                 ast_debug(1, "Bridge technology %s failed to join %p to bridge %p\n", new_technology->name, bridge_channel2, bridge);
 700                         }
 701                 }
 702
 703                 /* Fourth we tell them to wake up so they become aware that they above has happened */
 704                 pthread_kill(bridge_channel2->thread, SIGURG);
 705                 ao2_lock(bridge_channel2);
 706                 ast_cond_signal(&bridge_channel2->cond);
 707                 ao2_unlock(bridge_channel2);
 708         }
 709
 710         /* Now that all the channels have been moved over we need to get rid of all the information the old technology may have left around */
 711         if (old_technology->destroy) {
 712                 ast_debug(1, "Giving bridge technology %s the bridge structure %p (really %p) to destroy\n", old_technology->name, &temp_bridge, bridge);
 713                 if (old_technology->destroy(&temp_bridge)) {
 714                         ast_debug(1, "Bridge technology %s failed to destroy bridge structure %p (really %p)... some memory may have leaked\n", old_technology->name, &temp_bridge, bridge);
 715                 }
 716         }
 717
 718         /* Finally if the old technology has module referencing remove our reference, we are no longer going to use it */
 719         if (old_technology->mod) {
 720                 ast_module_unref(old_technology->mod);
 721         }
 722
 723         return 0;
 724 }
 725
 726 /*! \brief Run in a multithreaded model. Each joined channel does writing/reading in their own thread. TODO: Improve */
 727 static enum ast_bridge_channel_state bridge_channel_join_multithreaded(struct ast_bridge_channel *bridge_channel)
 728 {
 729         int fds[4] = { -1, }, nfds = 0, i = 0, outfd = -1, ms = -1;
 730         struct ast_channel *chan = NULL;
 731
 732         /* Add any file descriptors we may want to monitor */
 733         if (bridge_channel->bridge->technology->fd) {
 734                 for (i = 0; i < 4; i ++) {
 735                         if (bridge_channel->fds[i] >= 0) {
 736                                 fds[nfds++] = bridge_channel->fds[i];
 737                         }
 738                 }
 739         }
 740
 741         ao2_unlock(bridge_channel->bridge);
 742
 743         ao2_lock(bridge_channel);
 744         /* Wait for data to either come from the channel or us to be signalled */
 745         if (!bridge_channel->suspended) {
 746                 ao2_unlock(bridge_channel);
 747                 ast_debug(10, "Going into a multithreaded waitfor for bridge channel %p of bridge %p\n", bridge_channel, bridge_channel->bridge);
 748                 chan = ast_waitfor_nandfds(&bridge_channel->chan, 1, fds, nfds, NULL, &outfd, &ms);
 749         } else {
 750                 ast_debug(10, "Going into a multithreaded signal wait for bridge channel %p of bridge %p\n", bridge_channel, bridge_channel->bridge);
 751                 ast_cond_wait(&bridge_channel->cond, ao2_object_get_lockaddr(bridge_channel));
 752                 ao2_unlock(bridge_channel);
 753         }
 754
 755         ao2_lock(bridge_channel->bridge);
 756
 757         if (!bridge_channel->suspended) {
 758                 ast_bridge_handle_trip(bridge_channel->bridge, bridge_channel, chan, outfd);
 759         }
 760
 761         return bridge_channel->state;
 762 }
 763
 764 /*! \brief Run in a singlethreaded model. Each joined channel yields itself to the main bridge thread. TODO: Improve */
 765 static enum ast_bridge_channel_state bridge_channel_join_singlethreaded(struct ast_bridge_channel *bridge_channel)
 766 {
 767         ao2_unlock(bridge_channel->bridge);
 768         ao2_lock(bridge_channel);
 769         if (bridge_channel->state == AST_BRIDGE_CHANNEL_STATE_WAIT) {
 770                 ast_debug(1, "Going into a single threaded signal wait for bridge channel %p of bridge %p\n", bridge_channel, bridge_channel->bridge);
 771                 ast_cond_wait(&bridge_channel->cond, ao2_object_get_lockaddr(bridge_channel));
 772         }
 773         ao2_unlock(bridge_channel);
 774         ao2_lock(bridge_channel->bridge);
 775
 776         return bridge_channel->state;
 777 }
 778
 779 /*! \brief Internal function that suspends a channel from a bridge */
 780 static void bridge_channel_suspend(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
 781 {
 782         ao2_lock(bridge_channel);
 783         bridge_channel->suspended = 1;
 784         bridge_array_remove(bridge, bridge_channel->chan);
 785         ao2_unlock(bridge_channel);
 786
 787         if (bridge->technology->suspend) {
 788                 bridge->technology->suspend(bridge, bridge_channel);
 789         }
 790
 791         return;
 792 }
 793
 794 /*! \brief Internal function that unsuspends a channel from a bridge */
 795 static void bridge_channel_unsuspend(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
 796 {
 797         ao2_lock(bridge_channel);
 798         bridge_channel->suspended = 0;
 799         bridge_array_add(bridge, bridge_channel->chan);
 800         ast_cond_signal(&bridge_channel->cond);
 801         ao2_unlock(bridge_channel);
 802
 803         if (bridge->technology->unsuspend) {
 804                 bridge->technology->unsuspend(bridge, bridge_channel);
 805         }
 806
 807
 808
 809         return;
 810 }
 811
 812 /*!
 813  * \brief Internal function that executes a feature on a bridge channel
 814  * \note Neither the bridge nor the bridge_channel locks should be held when entering
 815  * this function.
 816  */
 817 static void bridge_channel_feature(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
 818 {
 819         struct ast_bridge_features *features = (bridge_channel->features ? bridge_channel->features : &bridge->features);
 820         struct ast_bridge_features_hook *hook = NULL;
 821         char dtmf[MAXIMUM_DTMF_FEATURE_STRING] = "";
 822         int look_for_dtmf = 1, dtmf_len = 0;
 823
 824         /* The channel is now under our control and we don't really want any begin frames to do our DTMF matching so disable 'em at the core level */
 825         ast_set_flag(ast_channel_flags(bridge_channel->chan), AST_FLAG_END_DTMF_ONLY);
 826
 827         /* Wait for DTMF on the channel and put it into a buffer. If the buffer matches any feature hook execute the hook. */
 828         while (look_for_dtmf) {
 829                 int res = ast_waitfordigit(bridge_channel->chan, 3000);
 830
 831                 /* If the above timed out simply exit */
 832                 if (!res) {
 833                         ast_debug(1, "DTMF feature string collection on bridge channel %p timed out\n", bridge_channel);
 834                         break;
 835                 } else if (res < 0) {
 836                         ast_debug(1, "DTMF feature string collection failed on bridge channel %p for some reason\n", bridge_channel);
 837                         break;
 838                 }
 839
 840                 /* Add the above DTMF into the DTMF string so we can do our matching */
 841                 dtmf[dtmf_len++] = res;
 842
 843                 ast_debug(1, "DTMF feature string on bridge channel %p is now '%s'\n", bridge_channel, dtmf);
 844
 845                 /* Assume that we do not want to look for DTMF any longer */
 846                 look_for_dtmf = 0;
 847
 848                 /* See if a DTMF feature hook matches or can match */
 849                 AST_LIST_TRAVERSE(&features->hooks, hook, entry) {
 850                         /* If this hook matches just break out now */
 851                         if (!strcmp(hook->dtmf, dtmf)) {
 852                                 ast_debug(1, "DTMF feature hook %p matched DTMF string '%s' on bridge channel %p\n", hook, dtmf, bridge_channel);
 853                                 look_for_dtmf = 0;
 854                                 break;
 855                         } else if (!strncmp(hook->dtmf, dtmf, dtmf_len)) {
 856                                 ast_debug(1, "DTMF feature hook %p can match DTMF string '%s', it wants '%s', on bridge channel %p\n", hook, dtmf, hook->dtmf, bridge_channel);
 857                                 look_for_dtmf = 1;
 858                         } else {
 859                                 ast_debug(1, "DTMF feature hook %p does not match DTMF string '%s', it wants '%s', on bridge channel %p\n", hook, dtmf, hook->dtmf, bridge_channel);
 860                         }
 861                 }
 862
 863                 /* If we have reached the maximum length of a DTMF feature string bail out */
 864                 if (dtmf_len == MAXIMUM_DTMF_FEATURE_STRING) {
 865                         break;
 866                 }
 867         }
 868
 869         /* Since we are done bringing DTMF in return to using both begin and end frames */
 870         ast_clear_flag(ast_channel_flags(bridge_channel->chan), AST_FLAG_END_DTMF_ONLY);
 871
 872         /* If a hook was actually matched execute it on this channel, otherwise stream up the DTMF to the other channels */
 873         if (hook) {
 874                 hook->callback(bridge, bridge_channel, hook->hook_pvt);
 875                 /* If we are handing the channel off to an external hook for ownership,
 876                  * we are not guaranteed what kind of state it will come back in.  If
 877                  * the channel hungup, we need to detect that here. */
 878                 if (bridge_channel->chan && ast_check_hangup_locked(bridge_channel->chan)) {
 879                         ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_END);
 880                 }
 881         } else {
 882                 ast_bridge_dtmf_stream(bridge, dtmf, bridge_channel->chan);
 883         }
 884
 885         /* if the channel is still in feature state, revert it back to wait state */
 886         if (bridge_channel->state == AST_BRIDGE_CHANNEL_STATE_FEATURE) {
 887                 ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_WAIT);
 888         }
 889
 890         return;
 891 }
 892
 893 static void bridge_channel_talking(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
 894 {
 895         struct ast_bridge_features *features = (bridge_channel->features ? bridge_channel->features : &bridge->features);
 896
 897         if (features && features->talker_cb) {
 898                 features->talker_cb(bridge, bridge_channel, features->talker_pvt_data);
 899         }
 900         ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_WAIT);
 901 }
 902
 903 /*! \brief Internal function that plays back DTMF on a bridge channel */
 904 static void bridge_channel_dtmf_stream(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
 905 {
 906         char dtmf_q[8] = "";
 907
 908         ast_copy_string(dtmf_q, bridge_channel->dtmf_stream_q, sizeof(dtmf_q));
 909         bridge_channel->dtmf_stream_q[0] = '\0';
 910
 911         ast_debug(1, "Playing DTMF stream '%s' out to bridge channel %p\n", dtmf_q, bridge_channel);
 912         ast_dtmf_stream(bridge_channel->chan, NULL, dtmf_q, 250, 0);
 913
 914         ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_WAIT);
 915
 916         return;
 917 }
 918
 919 /*! \brief Join a channel to a bridge and handle anything the bridge may want us to do */
 920 static enum ast_bridge_channel_state bridge_channel_join(struct ast_bridge_channel *bridge_channel)
 921 {
 922         struct ast_format formats[2];
 923         enum ast_bridge_channel_state state;
 924         ast_format_copy(&formats[0], ast_channel_readformat(bridge_channel->chan));
 925         ast_format_copy(&formats[1], ast_channel_writeformat(bridge_channel->chan));
 926
 927         /* Record the thread that will be the owner of us */
 928         bridge_channel->thread = pthread_self();
 929
 930         ast_debug(1, "Joining bridge channel %p to bridge %p\n", bridge_channel, bridge_channel->bridge);
 931
 932         ao2_lock(bridge_channel->bridge);
 933
 934         state = bridge_channel->state;
 935
 936         /* Add channel into the bridge */
 937         AST_LIST_INSERT_TAIL(&bridge_channel->bridge->channels, bridge_channel, entry);
 938         bridge_channel->bridge->num++;
 939
 940         bridge_array_add(bridge_channel->bridge, bridge_channel->chan);
 941
 942         if (bridge_channel->swap) {
 943                 struct ast_bridge_channel *bridge_channel2 = NULL;
 944
 945                 /* If we are performing a swap operation we do not need
 946                  * to execute the smart bridge operation as the actual number
 947                  * of channels involved will not have changed, we just need to
 948                  * tell the other channel to leave */
 949                 if ((bridge_channel2 = find_bridge_channel(bridge_channel->bridge, bridge_channel->swap))) {
 950                         ast_debug(1, "Swapping bridge channel %p out from bridge %p so bridge channel %p can slip in\n", bridge_channel2, bridge_channel->bridge, bridge_channel);
 951                         ast_bridge_change_state(bridge_channel2, AST_BRIDGE_CHANNEL_STATE_HANGUP);
 952                 }
 953
 954                 bridge_channel->swap = NULL;
 955         } else if (ast_test_flag(&bridge_channel->bridge->feature_flags, AST_BRIDGE_FLAG_SMART)) {
 956                 /* Perform the smart bridge operation, basically see if we need to move around between technologies */
 957                 smart_bridge_operation(bridge_channel->bridge, bridge_channel, bridge_channel->bridge->num);
 958         }
 959
 960         /* Make the channel compatible with the bridge */
 961         bridge_make_compatible(bridge_channel->bridge, bridge_channel);
 962
 963         /* Tell the bridge technology we are joining so they set us up */
 964         if (bridge_channel->bridge->technology->join) {
 965                 ast_debug(1, "Giving bridge technology %s notification that %p is joining bridge %p\n", bridge_channel->bridge->technology->name, bridge_channel, bridge_channel->bridge);
 966                 if (bridge_channel->bridge->technology->join(bridge_channel->bridge, bridge_channel)) {
 967                         ast_debug(1, "Bridge technology %s failed to join %p to bridge %p\n", bridge_channel->bridge->technology->name, bridge_channel, bridge_channel->bridge);
 968                 }
 969         }
 970
 971         /* Actually execute the respective threading model, and keep our bridge thread alive */
 972         while (bridge_channel->state == AST_BRIDGE_CHANNEL_STATE_WAIT) {
 973                 /* Update bridge pointer on channel */
 974                 ast_channel_internal_bridge_set(bridge_channel->chan, bridge_channel->bridge);
 975                 /* If the technology requires a thread and one is not running, start it up */
 976                 if (bridge_channel->bridge->thread == AST_PTHREADT_NULL && (bridge_channel->bridge->technology->capabilities & AST_BRIDGE_CAPABILITY_THREAD)) {
 977                         bridge_channel->bridge->stop = 0;
 978                         ast_debug(1, "Starting a bridge thread for bridge %p\n", bridge_channel->bridge);
 979                         ao2_ref(bridge_channel->bridge, +1);
 980                         if (ast_pthread_create(&bridge_channel->bridge->thread, NULL, bridge_thread, bridge_channel->bridge)) {
 981                                 ast_debug(1, "Failed to create a bridge thread for bridge %p, giving it another go.\n", bridge_channel->bridge);
 982                                 ao2_ref(bridge_channel->bridge, -1);
 983                                 continue;
 984                         }
 985                 }
 986                 /* Execute the threading model */
 987                 state = (bridge_channel->bridge->technology->capabilities & AST_BRIDGE_CAPABILITY_MULTITHREADED ? bridge_channel_join_multithreaded(bridge_channel) : bridge_channel_join_singlethreaded(bridge_channel));
 988                 /* Depending on the above state see what we need to do */
 989                 switch (state) {
 990                 case AST_BRIDGE_CHANNEL_STATE_FEATURE:
 991                         bridge_channel_suspend(bridge_channel->bridge, bridge_channel);
 992                         ao2_unlock(bridge_channel->bridge);
 993                         bridge_channel_feature(bridge_channel->bridge, bridge_channel);
 994                         ao2_lock(bridge_channel->bridge);
 995                         bridge_channel_unsuspend(bridge_channel->bridge, bridge_channel);
 996                         break;
 997                 case AST_BRIDGE_CHANNEL_STATE_DTMF:
 998                         bridge_channel_suspend(bridge_channel->bridge, bridge_channel);
 999                         bridge_channel_dtmf_stream(bridge_channel->bridge, bridge_channel);
1000                         bridge_channel_unsuspend(bridge_channel->bridge, bridge_channel);
1001                         break;
1002                 case AST_BRIDGE_CHANNEL_STATE_START_TALKING:
1003                 case AST_BRIDGE_CHANNEL_STATE_STOP_TALKING:
1004                         ao2_unlock(bridge_channel->bridge);
1005                         bridge_channel_talking(bridge_channel->bridge, bridge_channel);
1006                         ao2_lock(bridge_channel->bridge);
1007                         break;
1008                 default:
1009                         break;
1010                 }
1011         }
1012
1013         ast_channel_internal_bridge_set(bridge_channel->chan, NULL);
1014
1015         /* See if we need to dissolve the bridge itself if they hung up */
1016         if (bridge_channel->state == AST_BRIDGE_CHANNEL_STATE_END) {
1017                 bridge_check_dissolve(bridge_channel->bridge, bridge_channel);
1018         }
1019
1020         /* Tell the bridge technology we are leaving so they tear us down */
1021         if (bridge_channel->bridge->technology->leave) {
1022                 ast_debug(1, "Giving bridge technology %s notification that %p is leaving bridge %p\n", bridge_channel->bridge->technology->name, bridge_channel, bridge_channel->bridge);
1023                 if (bridge_channel->bridge->technology->leave(bridge_channel->bridge, bridge_channel)) {
1024                         ast_debug(1, "Bridge technology %s failed to leave %p from bridge %p\n", bridge_channel->bridge->technology->name, bridge_channel, bridge_channel->bridge);
1025                 }
1026         }
1027
1028         /* Remove channel from the bridge */
1029         bridge_channel->bridge->num--;
1030         AST_LIST_REMOVE(&bridge_channel->bridge->channels, bridge_channel, entry);
1031
1032         bridge_array_remove(bridge_channel->bridge, bridge_channel->chan);
1033
1034         /* Perform the smart bridge operation if needed since a channel has left */
1035         if (ast_test_flag(&bridge_channel->bridge->feature_flags, AST_BRIDGE_FLAG_SMART)) {
1036                 smart_bridge_operation(bridge_channel->bridge, NULL, bridge_channel->bridge->num);
1037         }
1038
1039         ao2_unlock(bridge_channel->bridge);
1040
1041         /* Restore original formats of the channel as they came in */
1042         if (ast_format_cmp(ast_channel_readformat(bridge_channel->chan), &formats[0]) == AST_FORMAT_CMP_NOT_EQUAL) {
1043                 ast_debug(1, "Bridge is returning %p to read format %s(%d)\n", bridge_channel, ast_getformatname(&formats[0]), formats[0].id);
1044                 if (ast_set_read_format(bridge_channel->chan, &formats[0])) {
1045                         ast_debug(1, "Bridge failed to return channel %p to read format %s(%d)\n", bridge_channel, ast_getformatname(&formats[0]), formats[0].id);
1046                 }
1047         }
1048         if (ast_format_cmp(ast_channel_writeformat(bridge_channel->chan), &formats[1]) == AST_FORMAT_CMP_NOT_EQUAL) {
1049                 ast_debug(1, "Bridge is returning %p to write format %s(%d)\n", bridge_channel, ast_getformatname(&formats[1]), formats[1].id);
1050                 if (ast_set_write_format(bridge_channel->chan, &formats[1])) {
1051                         ast_debug(1, "Bridge failed to return channel %p to write format %s(%d)\n", bridge_channel, ast_getformatname(&formats[1]), formats[1].id);
1052                 }
1053         }
1054
1055         return bridge_channel->state;
1056 }
1057
1058 static void bridge_channel_destroy(void *obj)
1059 {
1060         struct ast_bridge_channel *bridge_channel = obj;
1061
1062         if (bridge_channel->bridge) {
1063                 ao2_ref(bridge_channel->bridge, -1);
1064                 bridge_channel->bridge = NULL;
1065         }
1066         /* Destroy elements of the bridge channel structure and the bridge channel structure itself */
1067         ast_cond_destroy(&bridge_channel->cond);
1068 }
1069
1070 static struct ast_bridge_channel *bridge_channel_alloc(struct ast_bridge *bridge)
1071 {
1072         struct ast_bridge_channel *bridge_channel = ao2_alloc(sizeof(struct ast_bridge_channel), bridge_channel_destroy);
1073         if (!(bridge_channel)) {
1074                 return NULL;
1075         }
1076         ast_cond_init(&bridge_channel->cond, NULL);
1077         if (bridge) {
1078                 bridge_channel->bridge = bridge;
1079                 ao2_ref(bridge_channel->bridge, +1);
1080         }
1081         return bridge_channel;
1082 }
1083
1084 enum ast_bridge_channel_state ast_bridge_join(struct ast_bridge *bridge,
1085         struct ast_channel *chan,
1086         struct ast_channel *swap,
1087         struct ast_bridge_features *features,
1088         struct ast_bridge_tech_optimizations *tech_args)
1089 {
1090         struct ast_bridge_channel *bridge_channel = bridge_channel_alloc(bridge);
1091         enum ast_bridge_channel_state state = AST_BRIDGE_CHANNEL_STATE_HANGUP;
1092
1093         if (!bridge_channel) {
1094                 return state;
1095         }
1096         if (tech_args) {
1097                 memcpy(&bridge_channel->tech_args, tech_args, sizeof(bridge_channel->tech_args));
1098         }
1099
1100         /* Initialize various other elements of the bridge channel structure that we can't do above */
1101         bridge_channel->chan = chan;
1102         bridge_channel->swap = swap;
1103         bridge_channel->features = features;
1104
1105         state = bridge_channel_join(bridge_channel);
1106
1107         /* Cleanup all the data in the bridge channel after it leaves the bridge. */
1108         ao2_lock(bridge_channel);
1109         bridge_channel->chan = NULL;
1110         bridge_channel->swap = NULL;
1111         bridge_channel->features = NULL;
1112         ao2_unlock(bridge_channel);
1113
1114         ao2_ref(bridge_channel, -1);
1115
1116         return state;
1117 }
1118
1119 /*! \brief Thread responsible for imparted bridged channels */
1120 static void *bridge_channel_thread(void *data)
1121 {
1122         struct ast_bridge_channel *bridge_channel = data;
1123         enum ast_bridge_channel_state state;
1124
1125         state = bridge_channel_join(bridge_channel);
1126
1127         /* If no other thread is going to take the channel then hang it up, or else we would have to service it until something else came along */
1128         if (bridge_channel->allow_impart_hangup && (state == AST_BRIDGE_CHANNEL_STATE_END || state == AST_BRIDGE_CHANNEL_STATE_HANGUP)) {
1129                 ast_hangup(bridge_channel->chan);
1130         }
1131
1132         /* cleanup */
1133         ao2_lock(bridge_channel);
1134         bridge_channel->chan = NULL;
1135         bridge_channel->swap = NULL;
1136         bridge_channel->features = NULL;
1137         ao2_unlock(bridge_channel);
1138
1139         ao2_ref(bridge_channel, -1);
1140
1141         return NULL;
1142 }
1143
1144 int ast_bridge_impart(struct ast_bridge *bridge, struct ast_channel *chan, struct ast_channel *swap, struct ast_bridge_features *features, int allow_hangup)
1145 {
1146         struct ast_bridge_channel *bridge_channel = bridge_channel_alloc(bridge);
1147         /* Try to allocate a structure for the bridge channel */
1148         if (!(bridge_channel)) {
1149                 return -1;
1150         }
1151
1152         /* Setup various parameters */
1153         bridge_channel->chan = chan;
1154         bridge_channel->swap = swap;
1155         bridge_channel->features = features;
1156         bridge_channel->allow_impart_hangup = allow_hangup;
1157
1158
1159         /* Actually create the thread that will handle the channel */
1160         if (ast_pthread_create(&bridge_channel->thread, NULL, bridge_channel_thread, bridge_channel)) {
1161                 ao2_ref(bridge_channel, -1);
1162                 return -1;
1163         }
1164
1165         return 0;
1166 }
1167
1168 int ast_bridge_depart(struct ast_bridge *bridge, struct ast_channel *chan)
1169 {
1170         struct ast_bridge_channel *bridge_channel = NULL;
1171         pthread_t thread;
1172
1173         ao2_lock(bridge);
1174
1175         /* Try to find the channel that we want to depart */
1176         if (!(bridge_channel = find_bridge_channel(bridge, chan))) {
1177                 ao2_unlock(bridge);
1178                 return -1;
1179         }
1180
1181         ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_DEPART);
1182         thread = bridge_channel->thread;
1183
1184         ao2_unlock(bridge);
1185
1186         pthread_join(thread, NULL);
1187
1188         return 0;
1189 }
1190
1191 int ast_bridge_remove(struct ast_bridge *bridge, struct ast_channel *chan)
1192 {
1193         struct ast_bridge_channel *bridge_channel = NULL;
1194
1195         ao2_lock(bridge);
1196
1197         /* Try to find the channel that we want to remove */
1198         if (!(bridge_channel = find_bridge_channel(bridge, chan))) {
1199                 ao2_unlock(bridge);
1200                 return -1;
1201         }
1202
1203         ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_HANGUP);
1204
1205         ao2_unlock(bridge);
1206
1207         return 0;
1208 }
1209
1210 int ast_bridge_merge(struct ast_bridge *bridge0, struct ast_bridge *bridge1)
1211 {
1212         struct ast_bridge_channel *bridge_channel = NULL;
1213
1214         ao2_lock(bridge0);
1215         ao2_lock(bridge1);
1216
1217         /* If the first bridge currently has 2 channels and is not capable of becoming a multimixing bridge we can not merge */
1218         if ((bridge0->num + bridge1->num) > 2 && (!(bridge0->technology->capabilities & AST_BRIDGE_CAPABILITY_MULTIMIX) && !ast_test_flag(&bridge0->feature_flags, AST_BRIDGE_FLAG_SMART))) {
1219                 ao2_unlock(bridge1);
1220                 ao2_unlock(bridge0);
1221                 ast_debug(1, "Can't merge bridge %p into bridge %p, multimix is needed and it could not be acquired.\n", bridge1, bridge0);
1222                 return -1;
1223         }
1224
1225         ast_debug(1, "Merging channels from bridge %p into bridge %p\n", bridge1, bridge0);
1226
1227         /* Perform smart bridge operation on bridge we are merging into so it can change bridge technology if needed */
1228         if (smart_bridge_operation(bridge0, NULL, bridge0->num + bridge1->num)) {
1229                 ao2_unlock(bridge1);
1230                 ao2_unlock(bridge0);
1231                 ast_debug(1, "Can't merge bridge %p into bridge %p, tried to perform smart bridge operation and failed.\n", bridge1, bridge0);
1232                 return -1;
1233         }
1234
1235         /* If a thread is currently executing on bridge1 tell it to stop */
1236         if (bridge1->thread) {
1237                 ast_debug(1, "Telling bridge thread on bridge %p to stop as it is being merged into %p\n", bridge1, bridge0);
1238                 bridge1->thread = AST_PTHREADT_STOP;
1239         }
1240
1241         /* Move channels from bridge1 over to bridge0 */
1242         while ((bridge_channel = AST_LIST_REMOVE_HEAD(&bridge1->channels, entry))) {
1243                 /* Tell the technology handling bridge1 that the bridge channel is leaving */
1244                 if (bridge1->technology->leave) {
1245                         ast_debug(1, "Giving bridge technology %s notification that %p is leaving bridge %p\n", bridge1->technology->name, bridge_channel, bridge1);
1246                         if (bridge1->technology->leave(bridge1, bridge_channel)) {
1247                                 ast_debug(1, "Bridge technology %s failed to allow %p to leave bridge %p\n", bridge1->technology->name, bridge_channel, bridge1);
1248                         }
1249                 }
1250
1251                 /* Drop channel count and reference count on the bridge they are leaving */
1252                 bridge1->num--;
1253                 ao2_ref(bridge1, -1);
1254
1255                 bridge_array_remove(bridge1, bridge_channel->chan);
1256
1257                 /* Now add them into the bridge they are joining, increase channel count, and bump up reference count */
1258                 bridge_channel->bridge = bridge0;
1259                 AST_LIST_INSERT_TAIL(&bridge0->channels, bridge_channel, entry);
1260                 bridge0->num++;
1261                 ao2_ref(bridge0, +1);
1262
1263                 bridge_array_add(bridge0, bridge_channel->chan);
1264
1265                 /* Make the channel compatible with the new bridge it is joining or else formats would go amuck */
1266                 bridge_make_compatible(bridge0, bridge_channel);
1267
1268                 /* Tell the technology handling bridge0 that the bridge channel is joining */
1269                 if (bridge0->technology->join) {
1270                         ast_debug(1, "Giving bridge technology %s notification that %p is joining bridge %p\n", bridge0->technology->name, bridge_channel, bridge0);
1271                         if (bridge0->technology->join(bridge0, bridge_channel)) {
1272                                 ast_debug(1, "Bridge technology %s failed to join %p to bridge %p\n", bridge0->technology->name, bridge_channel, bridge0);
1273                         }
1274                 }
1275
1276                 /* Poke the bridge channel, this will cause it to wake up and execute the proper threading model for the new bridge it is in */
1277                 pthread_kill(bridge_channel->thread, SIGURG);
1278                 ao2_lock(bridge_channel);
1279                 ast_cond_signal(&bridge_channel->cond);
1280                 ao2_unlock(bridge_channel);
1281         }
1282
1283         ast_debug(1, "Merged channels from bridge %p into bridge %p\n", bridge1, bridge0);
1284
1285         ao2_unlock(bridge1);
1286         ao2_unlock(bridge0);
1287
1288         return 0;
1289 }
1290
1291 int ast_bridge_suspend(struct ast_bridge *bridge, struct ast_channel *chan)
1292 {
1293         struct ast_bridge_channel *bridge_channel;
1294
1295         ao2_lock(bridge);
1296
1297         if (!(bridge_channel = find_bridge_channel(bridge, chan))) {
1298                 ao2_unlock(bridge);
1299                 return -1;
1300         }
1301
1302         bridge_channel_suspend(bridge, bridge_channel);
1303
1304         ao2_unlock(bridge);
1305
1306         return 0;
1307 }
1308
1309 int ast_bridge_unsuspend(struct ast_bridge *bridge, struct ast_channel *chan)
1310 {
1311         struct ast_bridge_channel *bridge_channel;
1312
1313         ao2_lock(bridge);
1314
1315         if (!(bridge_channel = find_bridge_channel(bridge, chan))) {
1316                 ao2_unlock(bridge);
1317                 return -1;
1318         }
1319
1320         bridge_channel_unsuspend(bridge, bridge_channel);
1321
1322         ao2_unlock(bridge);
1323
1324         return 0;
1325 }
1326
1327 void ast_bridge_technology_suspend(struct ast_bridge_technology *technology)
1328 {
1329         technology->suspended = 1;
1330         return;
1331 }
1332
1333 void ast_bridge_technology_unsuspend(struct ast_bridge_technology *technology)
1334 {
1335         technology->suspended = 0;
1336         return;
1337 }
1338
1339 int ast_bridge_features_register(enum ast_bridge_builtin_feature feature, ast_bridge_features_hook_callback callback, const char *dtmf)
1340 {
1341         if (builtin_features_handlers[feature]) {
1342                 return -1;
1343         }
1344
1345         if (!ast_strlen_zero(dtmf)) {
1346                 ast_copy_string(builtin_features_dtmf[feature], dtmf, sizeof(builtin_features_dtmf[feature]));
1347         }
1348
1349         builtin_features_handlers[feature] = callback;
1350
1351         return 0;
1352 }
1353
1354 int ast_bridge_features_unregister(enum ast_bridge_builtin_feature feature)
1355 {
1356         if (!builtin_features_handlers[feature]) {
1357                 return -1;
1358         }
1359
1360         builtin_features_handlers[feature] = NULL;
1361
1362         return 0;
1363 }
1364
1365 int ast_bridge_features_hook(struct ast_bridge_features *features,
1366         const char *dtmf,
1367         ast_bridge_features_hook_callback callback,
1368         void *hook_pvt,
1369         ast_bridge_features_hook_pvt_destructor destructor)
1370 {
1371         struct ast_bridge_features_hook *hook = NULL;
1372
1373         /* Allocate new memory and setup it's various variables */
1374         if (!(hook = ast_calloc(1, sizeof(*hook)))) {
1375                 return -1;
1376         }
1377
1378         ast_copy_string(hook->dtmf, dtmf, sizeof(hook->dtmf));
1379         hook->callback = callback;
1380         hook->destructor = destructor;
1381         hook->hook_pvt = hook_pvt;
1382
1383         /* Once done we add it onto the list. Now it will be picked up when DTMF is used */
1384         AST_LIST_INSERT_TAIL(&features->hooks, hook, entry);
1385
1386         features->usable = 1;
1387
1388         return 0;
1389 }
1390
1391 int ast_bridge_features_set_talk_detector(struct ast_bridge_features *features,
1392         ast_bridge_talking_indicate_callback talker_cb,
1393         ast_bridge_talking_indicate_destructor talker_destructor,
1394         void *pvt_data)
1395 {
1396         features->talker_cb = talker_cb;
1397         features->talker_destructor_cb = talker_destructor;
1398         features->talker_pvt_data = pvt_data;
1399         return 0;
1400 }
1401
1402 int ast_bridge_features_enable(struct ast_bridge_features *features, enum ast_bridge_builtin_feature feature, const char *dtmf, void *config)
1403 {
1404         /* If no alternate DTMF stream was provided use the default one */
1405         if (ast_strlen_zero(dtmf)) {
1406                 dtmf = builtin_features_dtmf[feature];
1407                 /* If no DTMF is still available (ie: it has been disabled) then error out now */
1408                 if (ast_strlen_zero(dtmf)) {
1409                         ast_debug(1, "Failed to enable built in feature %d on %p, no DTMF string is available for it.\n", feature, features);
1410                         return -1;
1411                 }
1412         }
1413
1414         if (!builtin_features_handlers[feature]) {
1415                 return -1;
1416         }
1417
1418         /* The rest is basically pretty easy. We create another hook using the built in feature's callback and DTMF, easy as pie. */
1419         return ast_bridge_features_hook(features, dtmf, builtin_features_handlers[feature], config, NULL);
1420 }
1421
1422 int ast_bridge_features_set_flag(struct ast_bridge_features *features, enum ast_bridge_feature_flags flag)
1423 {
1424         ast_set_flag(&features->feature_flags, flag);
1425         features->usable = 1;
1426         return 0;
1427 }
1428
1429 int ast_bridge_features_init(struct ast_bridge_features *features)
1430 {
1431         /* Zero out the structure */
1432         memset(features, 0, sizeof(*features));
1433
1434         /* Initialize the hooks list, just in case */
1435         AST_LIST_HEAD_INIT_NOLOCK(&features->hooks);
1436
1437         return 0;
1438 }
1439
1440 int ast_bridge_features_cleanup(struct ast_bridge_features *features)
1441 {
1442         struct ast_bridge_features_hook *hook = NULL;
1443
1444         /* This is relatively simple, hooks are kept as a list on the features structure so we just pop them off and free them */
1445         while ((hook = AST_LIST_REMOVE_HEAD(&features->hooks, entry))) {
1446                 if (hook->destructor) {
1447                         hook->destructor(hook->hook_pvt);
1448                 }
1449                 ast_free(hook);
1450         }
1451         if (features->talker_destructor_cb && features->talker_pvt_data) {
1452                 features->talker_destructor_cb(features->talker_pvt_data);
1453                 features->talker_pvt_data = NULL;
1454         }
1455
1456         return 0;
1457 }
1458
1459 int ast_bridge_dtmf_stream(struct ast_bridge *bridge, const char *dtmf, struct ast_channel *chan)
1460 {
1461         struct ast_bridge_channel *bridge_channel = NULL;
1462
1463         ao2_lock(bridge);
1464
1465         AST_LIST_TRAVERSE(&bridge->channels, bridge_channel, entry) {
1466                 if (bridge_channel->chan == chan) {
1467                         continue;
1468                 }
1469                 ast_copy_string(bridge_channel->dtmf_stream_q, dtmf, sizeof(bridge_channel->dtmf_stream_q));
1470                 ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_DTMF);
1471         }
1472
1473         ao2_unlock(bridge);
1474
1475         return 0;
1476 }
1477
1478 void ast_bridge_set_mixing_interval(struct ast_bridge *bridge, unsigned int mixing_interval)
1479 {
1480         ao2_lock(bridge);
1481         bridge->internal_mixing_interval = mixing_interval;
1482         ao2_unlock(bridge);
1483 }
1484
1485 void ast_bridge_set_internal_sample_rate(struct ast_bridge *bridge, unsigned int sample_rate)
1486 {
1487
1488         ao2_lock(bridge);
1489         bridge->internal_sample_rate = sample_rate;
1490         ao2_unlock(bridge);
1491 }
1492
1493 static void cleanup_video_mode(struct ast_bridge *bridge)
1494 {
1495         switch (bridge->video_mode.mode) {
1496         case AST_BRIDGE_VIDEO_MODE_NONE:
1497                 break;
1498         case AST_BRIDGE_VIDEO_MODE_SINGLE_SRC:
1499                 if (bridge->video_mode.mode_data.single_src_data.chan_vsrc) {
1500                         ast_channel_unref(bridge->video_mode.mode_data.single_src_data.chan_vsrc);
1501                 }
1502                 break;
1503         case AST_BRIDGE_VIDEO_MODE_TALKER_SRC:
1504                 if (bridge->video_mode.mode_data.talker_src_data.chan_vsrc) {
1505                         ast_channel_unref(bridge->video_mode.mode_data.talker_src_data.chan_vsrc);
1506                 }
1507                 if (bridge->video_mode.mode_data.talker_src_data.chan_old_vsrc) {
1508                         ast_channel_unref(bridge->video_mode.mode_data.talker_src_data.chan_old_vsrc);
1509                 }
1510         }
1511         memset(&bridge->video_mode, 0, sizeof(bridge->video_mode));
1512 }
1513
1514 void ast_bridge_set_single_src_video_mode(struct ast_bridge *bridge, struct ast_channel *video_src_chan)
1515 {
1516         ao2_lock(bridge);
1517         cleanup_video_mode(bridge);
1518         bridge->video_mode.mode = AST_BRIDGE_VIDEO_MODE_SINGLE_SRC;
1519         bridge->video_mode.mode_data.single_src_data.chan_vsrc = ast_channel_ref(video_src_chan);
1520         ast_test_suite_event_notify("BRIDGE_VIDEO_MODE", "Message: video mode set to single source\r\nVideo Mode: %d\r\nVideo Channel: %s", bridge->video_mode.mode, ast_channel_name(video_src_chan));
1521         ast_indicate(video_src_chan, AST_CONTROL_VIDUPDATE);
1522         ao2_unlock(bridge);
1523 }
1524
1525 void ast_bridge_set_talker_src_video_mode(struct ast_bridge *bridge)
1526 {
1527         ao2_lock(bridge);
1528         cleanup_video_mode(bridge);
1529         bridge->video_mode.mode = AST_BRIDGE_VIDEO_MODE_TALKER_SRC;
1530         ast_test_suite_event_notify("BRIDGE_VIDEO_MODE", "Message: video mode set to talker source\r\nVideo Mode: %d", bridge->video_mode.mode);
1531         ao2_unlock(bridge);
1532 }
1533
1534 void ast_bridge_update_talker_src_video_mode(struct ast_bridge *bridge, struct ast_channel *chan, int talker_energy, int is_keyframe)
1535 {
1536         struct ast_bridge_video_talker_src_data *data;
1537         /* If the channel doesn't support video, we don't care about it */
1538         if (!ast_format_cap_has_type(ast_channel_nativeformats(chan), AST_FORMAT_TYPE_VIDEO)) {
1539                 return;
1540         }
1541
1542         ao2_lock(bridge);
1543         data = &bridge->video_mode.mode_data.talker_src_data;
1544
1545         if (data->chan_vsrc == chan) {
1546                 data->average_talking_energy = talker_energy;
1547         } else if ((data->average_talking_energy < talker_energy) && is_keyframe) {
1548                 if (data->chan_old_vsrc) {
1549                         ast_channel_unref(data->chan_old_vsrc);
1550                 }
1551                 if (data->chan_vsrc) {
1552                         data->chan_old_vsrc = data->chan_vsrc;
1553                         ast_indicate(data->chan_old_vsrc, AST_CONTROL_VIDUPDATE);
1554                 }
1555                 data->chan_vsrc = ast_channel_ref(chan);
1556                 data->average_talking_energy = talker_energy;
1557                 ast_test_suite_event_notify("BRIDGE_VIDEO_SRC", "Message: video source updated\r\nVideo Channel: %s", ast_channel_name(data->chan_vsrc));
1558                 ast_indicate(data->chan_vsrc, AST_CONTROL_VIDUPDATE);
1559         } else if ((data->average_talking_energy < talker_energy) && !is_keyframe) {
1560                 ast_indicate(chan, AST_CONTROL_VIDUPDATE);
1561         } else if (!data->chan_vsrc && is_keyframe) {
1562                 data->chan_vsrc = ast_channel_ref(chan);
1563                 data->average_talking_energy = talker_energy;
1564                 ast_test_suite_event_notify("BRIDGE_VIDEO_SRC", "Message: video source updated\r\nVideo Channel: %s", ast_channel_name(data->chan_vsrc));
1565                 ast_indicate(chan, AST_CONTROL_VIDUPDATE);
1566         } else if (!data->chan_old_vsrc && is_keyframe) {
1567                 data->chan_old_vsrc = ast_channel_ref(chan);
1568                 ast_indicate(chan, AST_CONTROL_VIDUPDATE);
1569         }
1570         ao2_unlock(bridge);
1571 }
1572
1573 int ast_bridge_number_video_src(struct ast_bridge *bridge)
1574 {
1575         int res = 0;
1576
1577         ao2_lock(bridge);
1578         switch (bridge->video_mode.mode) {
1579         case AST_BRIDGE_VIDEO_MODE_NONE:
1580                 break;
1581         case AST_BRIDGE_VIDEO_MODE_SINGLE_SRC:
1582                 if (bridge->video_mode.mode_data.single_src_data.chan_vsrc) {
1583                         res = 1;
1584                 }
1585                 break;
1586         case AST_BRIDGE_VIDEO_MODE_TALKER_SRC:
1587                 if (bridge->video_mode.mode_data.talker_src_data.chan_vsrc) {
1588                         res++;
1589                 }
1590                 if (bridge->video_mode.mode_data.talker_src_data.chan_old_vsrc) {
1591                         res++;
1592                 }
1593         }
1594         ao2_unlock(bridge);
1595         return res;
1596 }
1597
1598 int ast_bridge_is_video_src(struct ast_bridge *bridge, struct ast_channel *chan)
1599 {
1600         int res = 0;
1601
1602         ao2_lock(bridge);
1603         switch (bridge->video_mode.mode) {
1604         case AST_BRIDGE_VIDEO_MODE_NONE:
1605                 break;
1606         case AST_BRIDGE_VIDEO_MODE_SINGLE_SRC:
1607                 if (bridge->video_mode.mode_data.single_src_data.chan_vsrc == chan) {
1608                         res = 1;
1609                 }
1610                 break;
1611         case AST_BRIDGE_VIDEO_MODE_TALKER_SRC:
1612                 if (bridge->video_mode.mode_data.talker_src_data.chan_vsrc == chan) {
1613                         res = 1;
1614                 } else if (bridge->video_mode.mode_data.talker_src_data.chan_old_vsrc == chan) {
1615                         res = 2;
1616                 }
1617
1618         }
1619         ao2_unlock(bridge);
1620         return res;
1621 }
1622
1623 void ast_bridge_remove_video_src(struct ast_bridge *bridge, struct ast_channel *chan)
1624 {
1625         ao2_lock(bridge);
1626         switch (bridge->video_mode.mode) {
1627         case AST_BRIDGE_VIDEO_MODE_NONE:
1628                 break;
1629         case AST_BRIDGE_VIDEO_MODE_SINGLE_SRC:
1630                 if (bridge->video_mode.mode_data.single_src_data.chan_vsrc == chan) {
1631                         if (bridge->video_mode.mode_data.single_src_data.chan_vsrc) {
1632                                 ast_channel_unref(bridge->video_mode.mode_data.single_src_data.chan_vsrc);
1633                         }
1634                         bridge->video_mode.mode_data.single_src_data.chan_vsrc = NULL;
1635                 }
1636                 break;
1637         case AST_BRIDGE_VIDEO_MODE_TALKER_SRC:
1638                 if (bridge->video_mode.mode_data.talker_src_data.chan_vsrc == chan) {
1639                         if (bridge->video_mode.mode_data.talker_src_data.chan_vsrc) {
1640                                 ast_channel_unref(bridge->video_mode.mode_data.talker_src_data.chan_vsrc);
1641                         }
1642                         bridge->video_mode.mode_data.talker_src_data.chan_vsrc = NULL;
1643                         bridge->video_mode.mode_data.talker_src_data.average_talking_energy = 0;
1644                 }
1645                 if (bridge->video_mode.mode_data.talker_src_data.chan_old_vsrc == chan) {
1646                         if (bridge->video_mode.mode_data.talker_src_data.chan_old_vsrc) {
1647                                 ast_channel_unref(bridge->video_mode.mode_data.talker_src_data.chan_old_vsrc);
1648                         }
1649                         bridge->video_mode.mode_data.talker_src_data.chan_old_vsrc = NULL;
1650                 }
1651         }
1652         ao2_unlock(bridge);
1653 }