Multiple revisions 369001-369002
[asterisk/asterisk.git] / 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 }