framehooks: Add callback for determining if a hook is consuming frames of a specific...
[asterisk/asterisk.git] / bridges / bridge_native_rtp.c
1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 2013, 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 Native RTP bridging technology module
22  *
23  * \author Joshua Colp <jcolp@digium.com>
24  *
25  * \ingroup bridges
26  */
27
28 /*** MODULEINFO
29         <support_level>core</support_level>
30  ***/
31
32 #include "asterisk.h"
33
34 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
35
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <sys/types.h>
40 #include <sys/stat.h>
41
42 #include "asterisk/module.h"
43 #include "asterisk/channel.h"
44 #include "asterisk/bridge.h"
45 #include "asterisk/bridge_technology.h"
46 #include "asterisk/frame.h"
47 #include "asterisk/rtp_engine.h"
48
49 /*! \brief Internal structure which contains information about bridged RTP channels */
50 struct native_rtp_bridge_data {
51         /*! \brief Framehook used to intercept certain control frames */
52         int id;
53 };
54
55 /*! \brief Internal helper function which gets all RTP information (glue and instances) relating to the given channels */
56 static enum ast_rtp_glue_result native_rtp_bridge_get(struct ast_channel *c0, struct ast_channel *c1, struct ast_rtp_glue **glue0,
57         struct ast_rtp_glue **glue1, struct ast_rtp_instance **instance0, struct ast_rtp_instance **instance1,
58         struct ast_rtp_instance **vinstance0, struct ast_rtp_instance **vinstance1)
59 {
60         enum ast_rtp_glue_result audio_glue0_res;
61         enum ast_rtp_glue_result video_glue0_res;
62         enum ast_rtp_glue_result audio_glue1_res;
63         enum ast_rtp_glue_result video_glue1_res;
64
65         if (!(*glue0 = ast_rtp_instance_get_glue(ast_channel_tech(c0)->type)) ||
66                 !(*glue1 = ast_rtp_instance_get_glue(ast_channel_tech(c1)->type))) {
67                 return AST_RTP_GLUE_RESULT_FORBID;
68         }
69
70         audio_glue0_res = (*glue0)->get_rtp_info(c0, instance0);
71         video_glue0_res = (*glue0)->get_vrtp_info ? (*glue0)->get_vrtp_info(c0, vinstance0) : AST_RTP_GLUE_RESULT_FORBID;
72
73         audio_glue1_res = (*glue1)->get_rtp_info(c1, instance1);
74         video_glue1_res = (*glue1)->get_vrtp_info ? (*glue1)->get_vrtp_info(c1, vinstance1) : AST_RTP_GLUE_RESULT_FORBID;
75
76         /* Apply any limitations on direct media bridging that may be present */
77         if (audio_glue0_res == audio_glue1_res && audio_glue1_res == AST_RTP_GLUE_RESULT_REMOTE) {
78                 if ((*glue0)->allow_rtp_remote && !((*glue0)->allow_rtp_remote(c0, *instance1))) {
79                         /* If the allow_rtp_remote indicates that remote isn't allowed, revert to local bridge */
80                         audio_glue0_res = audio_glue1_res = AST_RTP_GLUE_RESULT_LOCAL;
81                 } else if ((*glue1)->allow_rtp_remote && !((*glue1)->allow_rtp_remote(c1, *instance0))) {
82                         audio_glue0_res = audio_glue1_res = AST_RTP_GLUE_RESULT_LOCAL;
83                 }
84         }
85         if (video_glue0_res == video_glue1_res && video_glue1_res == AST_RTP_GLUE_RESULT_REMOTE) {
86                 if ((*glue0)->allow_vrtp_remote && !((*glue0)->allow_vrtp_remote(c0, *instance1))) {
87                         /* if the allow_vrtp_remote indicates that remote isn't allowed, revert to local bridge */
88                         video_glue0_res = video_glue1_res = AST_RTP_GLUE_RESULT_LOCAL;
89                 } else if ((*glue1)->allow_vrtp_remote && !((*glue1)->allow_vrtp_remote(c1, *instance0))) {
90                         video_glue0_res = video_glue1_res = AST_RTP_GLUE_RESULT_LOCAL;
91                 }
92         }
93
94         /* If we are carrying video, and both sides are not going to remotely bridge... fail the native bridge */
95         if (video_glue0_res != AST_RTP_GLUE_RESULT_FORBID
96                 && (audio_glue0_res != AST_RTP_GLUE_RESULT_REMOTE
97                         || video_glue0_res != AST_RTP_GLUE_RESULT_REMOTE)) {
98                 audio_glue0_res = AST_RTP_GLUE_RESULT_FORBID;
99         }
100         if (video_glue1_res != AST_RTP_GLUE_RESULT_FORBID
101                 && (audio_glue1_res != AST_RTP_GLUE_RESULT_REMOTE
102                         || video_glue1_res != AST_RTP_GLUE_RESULT_REMOTE)) {
103                 audio_glue1_res = AST_RTP_GLUE_RESULT_FORBID;
104         }
105
106         /* If any sort of bridge is forbidden just completely bail out and go back to generic bridging */
107         if (audio_glue0_res == AST_RTP_GLUE_RESULT_FORBID
108                 || audio_glue1_res == AST_RTP_GLUE_RESULT_FORBID) {
109                 return AST_RTP_GLUE_RESULT_FORBID;
110         }
111
112         return audio_glue0_res;
113 }
114
115 /*!
116  * \internal
117  * \brief Start native RTP bridging of two channels
118  *
119  * \param bridge The bridge that had native RTP bridging happening on it
120  * \param target If remote RTP bridging, the channel that is unheld.
121  *
122  * \note Bridge must be locked when calling this function.
123  */
124 static void native_rtp_bridge_start(struct ast_bridge *bridge, struct ast_channel *target)
125 {
126         struct ast_bridge_channel *c0 = AST_LIST_FIRST(&bridge->channels);
127         struct ast_bridge_channel *c1 = AST_LIST_LAST(&bridge->channels);
128         enum ast_rtp_glue_result native_type;
129         struct ast_rtp_glue *glue0, *glue1;
130         RAII_VAR(struct ast_rtp_instance *, instance0, NULL, ao2_cleanup);
131         RAII_VAR(struct ast_rtp_instance *, instance1, NULL, ao2_cleanup);
132         RAII_VAR(struct ast_rtp_instance *, vinstance0, NULL, ao2_cleanup);
133         RAII_VAR(struct ast_rtp_instance *, vinstance1, NULL, ao2_cleanup);
134         RAII_VAR(struct ast_rtp_instance *, tinstance0, NULL, ao2_cleanup);
135         RAII_VAR(struct ast_rtp_instance *, tinstance1, NULL, ao2_cleanup);
136         RAII_VAR(struct ast_format_cap *, cap0, ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_NOLOCK), ast_format_cap_destroy);
137         RAII_VAR(struct ast_format_cap *, cap1, ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_NOLOCK), ast_format_cap_destroy);
138
139         if (c0 == c1) {
140                 return;
141         }
142
143         ast_channel_lock_both(c0->chan, c1->chan);
144         native_type = native_rtp_bridge_get(c0->chan, c1->chan, &glue0, &glue1, &instance0, &instance1, &vinstance0, &vinstance1);
145
146         switch (native_type) {
147         case AST_RTP_GLUE_RESULT_LOCAL:
148                 if (ast_rtp_instance_get_engine(instance0)->local_bridge) {
149                         ast_rtp_instance_get_engine(instance0)->local_bridge(instance0, instance1);
150                 }
151                 if (ast_rtp_instance_get_engine(instance1)->local_bridge) {
152                         ast_rtp_instance_get_engine(instance1)->local_bridge(instance1, instance0);
153                 }
154                 ast_rtp_instance_set_bridged(instance0, instance1);
155                 ast_rtp_instance_set_bridged(instance1, instance0);
156                 ast_debug(2, "Locally RTP bridged '%s' and '%s' in stack\n",
157                         ast_channel_name(c0->chan), ast_channel_name(c1->chan));
158                 break;
159
160         case AST_RTP_GLUE_RESULT_REMOTE:
161                 if (glue0->get_codec) {
162                         glue0->get_codec(c0->chan, cap0);
163                 }
164                 if (glue1->get_codec) {
165                         glue1->get_codec(c1->chan, cap1);
166                 }
167
168                 /* If we have a target, it's the channel that received the UNHOLD or UPDATE_RTP_PEER frame and was told to resume */
169                 if (!target) {
170                         glue0->update_peer(c0->chan, instance1, vinstance1, tinstance1, cap1, 0);
171                         glue1->update_peer(c1->chan, instance0, vinstance0, tinstance0, cap0, 0);
172                         ast_debug(2, "Remotely bridged '%s' and '%s' - media will flow directly between them\n",
173                                 ast_channel_name(c0->chan), ast_channel_name(c1->chan));
174                 } else {
175                         /*
176                          * If a target was provided, it is the recipient of an unhold or an update and needs to have
177                          * its media redirected to fit the current remote bridging needs. The other channel is either
178                          * already set up to handle the new media path or will have its own set of updates independent
179                          * of this pass.
180                          */
181                         if (c0->chan == target) {
182                                 glue0->update_peer(c0->chan, instance1, vinstance1, tinstance1, cap1, 0);
183                         } else {
184                                 glue1->update_peer(c1->chan, instance0, vinstance0, tinstance0, cap0, 0);
185                         }
186                 }
187                 break;
188         case AST_RTP_GLUE_RESULT_FORBID:
189                 break;
190         }
191
192         ast_channel_unlock(c0->chan);
193         ast_channel_unlock(c1->chan);
194 }
195
196 static void native_rtp_bridge_stop(struct ast_bridge *bridge, struct ast_channel *target)
197 {
198         struct ast_bridge_channel *c0 = AST_LIST_FIRST(&bridge->channels);
199         struct ast_bridge_channel *c1 = AST_LIST_LAST(&bridge->channels);
200         enum ast_rtp_glue_result native_type;
201         struct ast_rtp_glue *glue0, *glue1 = NULL;
202         RAII_VAR(struct ast_rtp_instance *, instance0, NULL, ao2_cleanup);
203         RAII_VAR(struct ast_rtp_instance *, instance1, NULL, ao2_cleanup);
204         RAII_VAR(struct ast_rtp_instance *, vinstance0, NULL, ao2_cleanup);
205         RAII_VAR(struct ast_rtp_instance *, vinstance1, NULL, ao2_cleanup);
206
207         if (c0 == c1) {
208                 return;
209         }
210
211         if (!c0 || !c1) {
212                 return;
213         }
214
215         ast_channel_lock_both(c0->chan, c1->chan);
216         native_type = native_rtp_bridge_get(c0->chan, c1->chan, &glue0, &glue1, &instance0, &instance1, &vinstance0, &vinstance1);
217
218         switch (native_type) {
219         case AST_RTP_GLUE_RESULT_LOCAL:
220                 if (ast_rtp_instance_get_engine(instance0)->local_bridge) {
221                         ast_rtp_instance_get_engine(instance0)->local_bridge(instance0, NULL);
222                 }
223                 if (instance1 && ast_rtp_instance_get_engine(instance1)->local_bridge) {
224                         ast_rtp_instance_get_engine(instance1)->local_bridge(instance1, NULL);
225                 }
226                 ast_rtp_instance_set_bridged(instance0, NULL);
227                 if (instance1) {
228                         ast_rtp_instance_set_bridged(instance1, NULL);
229                 }
230                 break;
231         case AST_RTP_GLUE_RESULT_REMOTE:
232                 if (!target) {
233                         glue0->update_peer(c0->chan, NULL, NULL, NULL, NULL, 0);
234                         if (glue1) {
235                                 glue1->update_peer(c1->chan, NULL, NULL, NULL, NULL, 0);
236                         }
237                 } else {
238                         /*
239                          * If a target was provided, it is being put on hold and should expect to
240                          * receive mediafrom sterisk instead of what it was previously connected to.
241                          */
242                         if (c0->chan == target) {
243                                 glue0->update_peer(c0->chan, NULL, NULL, NULL, NULL, 0);
244                         } else if (glue1) {
245                                 glue1->update_peer(c1->chan, NULL, NULL, NULL, NULL, 0);
246                         }
247                 }
248                 break;
249         case AST_RTP_GLUE_RESULT_FORBID:
250                 break;
251         }
252
253         ast_debug(2, "Discontinued RTP bridging of '%s' and '%s' - media will flow through Asterisk core\n",
254                 ast_channel_name(c0->chan), ast_channel_name(c1->chan));
255
256         ast_channel_unlock(c0->chan);
257         ast_channel_unlock(c1->chan);
258 }
259
260 /*! \brief Frame hook that is called to intercept hold/unhold */
261 static struct ast_frame *native_rtp_framehook(struct ast_channel *chan, struct ast_frame *f, enum ast_framehook_event event, void *data)
262 {
263         RAII_VAR(struct ast_bridge *, bridge, NULL, ao2_cleanup);
264
265         if (!f || (event != AST_FRAMEHOOK_EVENT_WRITE)) {
266                 return f;
267         }
268
269         bridge = ast_channel_get_bridge(chan);
270
271         if (bridge) {
272                 /* native_rtp_bridge_start/stop are not being called from bridging
273                    core so we need to lock the bridge prior to calling these functions
274                    Unfortunately that means unlocking the channel, but as it
275                    should not be modified this should be okay...hopefully */
276                 ast_channel_unlock(chan);
277                 ast_bridge_lock(bridge);
278                 if (f->subclass.integer == AST_CONTROL_HOLD) {
279                         native_rtp_bridge_stop(bridge, chan);
280                 } else if ((f->subclass.integer == AST_CONTROL_UNHOLD) || (f->subclass.integer == AST_CONTROL_UPDATE_RTP_PEER)) {
281                         native_rtp_bridge_start(bridge, chan);
282                 }
283                 ast_bridge_unlock(bridge);
284                 ast_channel_lock(chan);
285
286         }
287
288         return f;
289 }
290
291 /*! \brief Callback function which informs upstream if we are consuming a frame of a specific type */
292 static int native_rtp_framehook_consume(void *data, enum ast_frame_type type)
293 {
294         return (type == AST_FRAME_CONTROL ? 1 : 0);
295 }
296
297 /*! \brief Internal helper function which checks whether the channels are compatible with our native bridging */
298 static int native_rtp_bridge_capable(struct ast_channel *chan)
299 {
300         return !ast_channel_has_hook_requiring_audio(chan);
301 }
302
303 static int native_rtp_bridge_compatible(struct ast_bridge *bridge)
304 {
305         struct ast_bridge_channel *c0 = AST_LIST_FIRST(&bridge->channels);
306         struct ast_bridge_channel *c1 = AST_LIST_LAST(&bridge->channels);
307         enum ast_rtp_glue_result native_type;
308         struct ast_rtp_glue *glue0, *glue1;
309         RAII_VAR(struct ast_rtp_instance *, instance0, NULL, ao2_cleanup);
310         RAII_VAR(struct ast_rtp_instance *, instance1, NULL, ao2_cleanup);
311         RAII_VAR(struct ast_rtp_instance *, vinstance0, NULL, ao2_cleanup);
312         RAII_VAR(struct ast_rtp_instance *, vinstance1, NULL, ao2_cleanup);
313         RAII_VAR(struct ast_format_cap *, cap0, ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_NOLOCK), ast_format_cap_destroy);
314         RAII_VAR(struct ast_format_cap *, cap1, ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_NOLOCK), ast_format_cap_destroy);
315         int read_ptime0, read_ptime1, write_ptime0, write_ptime1;
316
317         /* We require two channels before even considering native bridging */
318         if (bridge->num_channels != 2) {
319                 ast_debug(1, "Bridge '%s' can not use native RTP bridge as two channels are required\n",
320                         bridge->uniqueid);
321                 return 0;
322         }
323
324         if (!native_rtp_bridge_capable(c0->chan)) {
325                 ast_debug(1, "Bridge '%s' can not use native RTP bridge as channel '%s' has features which prevent it\n",
326                         bridge->uniqueid, ast_channel_name(c0->chan));
327                 return 0;
328         }
329
330         if (!native_rtp_bridge_capable(c1->chan)) {
331                 ast_debug(1, "Bridge '%s' can not use native RTP bridge as channel '%s' has features which prevent it\n",
332                         bridge->uniqueid, ast_channel_name(c1->chan));
333                 return 0;
334         }
335
336         if ((native_type = native_rtp_bridge_get(c0->chan, c1->chan, &glue0, &glue1, &instance0, &instance1, &vinstance0, &vinstance1))
337                 == AST_RTP_GLUE_RESULT_FORBID) {
338                 ast_debug(1, "Bridge '%s' can not use native RTP bridge as it was forbidden while getting details\n",
339                         bridge->uniqueid);
340                 return 0;
341         }
342
343         if (ao2_container_count(c0->features->dtmf_hooks) && ast_rtp_instance_dtmf_mode_get(instance0)) {
344                 ast_debug(1, "Bridge '%s' can not use native RTP bridge as channel '%s' has DTMF hooks\n",
345                         bridge->uniqueid, ast_channel_name(c0->chan));
346                 return 0;
347         }
348
349         if (ao2_container_count(c1->features->dtmf_hooks) && ast_rtp_instance_dtmf_mode_get(instance1)) {
350                 ast_debug(1, "Bridge '%s' can not use native RTP bridge as channel '%s' has DTMF hooks\n",
351                         bridge->uniqueid, ast_channel_name(c1->chan));
352                 return 0;
353         }
354
355         if ((native_type == AST_RTP_GLUE_RESULT_LOCAL) && ((ast_rtp_instance_get_engine(instance0)->local_bridge !=
356                 ast_rtp_instance_get_engine(instance1)->local_bridge) ||
357                 (ast_rtp_instance_get_engine(instance0)->dtmf_compatible &&
358                         !ast_rtp_instance_get_engine(instance0)->dtmf_compatible(c0->chan, instance0, c1->chan, instance1)))) {
359                 ast_debug(1, "Bridge '%s' can not use local native RTP bridge as local bridge or DTMF is not compatible\n",
360                         bridge->uniqueid);
361                 return 0;
362         }
363
364         /* Make sure that codecs match */
365         if (glue0->get_codec) {
366                 glue0->get_codec(c0->chan, cap0);
367         }
368         if (glue1->get_codec) {
369                 glue1->get_codec(c1->chan, cap1);
370         }
371         if (!ast_format_cap_is_empty(cap0) && !ast_format_cap_is_empty(cap1) && !ast_format_cap_has_joint(cap0, cap1)) {
372                 char tmp0[256] = { 0, }, tmp1[256] = { 0, };
373
374                 ast_debug(1, "Channel codec0 = %s is not codec1 = %s, cannot native bridge in RTP.\n",
375                         ast_getformatname_multiple(tmp0, sizeof(tmp0), cap0),
376                         ast_getformatname_multiple(tmp1, sizeof(tmp1), cap1));
377                 return 0;
378         }
379
380         read_ptime0 = (ast_codec_pref_getsize(&ast_rtp_instance_get_codecs(instance0)->pref, ast_channel_rawreadformat(c0->chan))).cur_ms;
381         read_ptime1 = (ast_codec_pref_getsize(&ast_rtp_instance_get_codecs(instance1)->pref, ast_channel_rawreadformat(c1->chan))).cur_ms;
382         write_ptime0 = (ast_codec_pref_getsize(&ast_rtp_instance_get_codecs(instance0)->pref, ast_channel_rawwriteformat(c0->chan))).cur_ms;
383         write_ptime1 = (ast_codec_pref_getsize(&ast_rtp_instance_get_codecs(instance1)->pref, ast_channel_rawwriteformat(c1->chan))).cur_ms;
384
385         if (read_ptime0 != write_ptime1 || read_ptime1 != write_ptime0) {
386                 ast_debug(1, "Packetization differs between RTP streams (%d != %d or %d != %d). Cannot native bridge in RTP\n",
387                                 read_ptime0, write_ptime1, read_ptime1, write_ptime0);
388                 return 0;
389         }
390
391         return 1;
392 }
393
394 /*! \brief Helper function which adds frame hook to bridge channel */
395 static int native_rtp_bridge_framehook_attach(struct ast_bridge_channel *bridge_channel)
396 {
397         struct native_rtp_bridge_data *data = ao2_alloc(sizeof(*data), NULL);
398         static struct ast_framehook_interface hook = {
399                 .version = AST_FRAMEHOOK_INTERFACE_VERSION,
400                 .event_cb = native_rtp_framehook,
401                 .consume_cb = native_rtp_framehook_consume,
402         };
403
404         if (!data) {
405                 return -1;
406         }
407
408         ast_channel_lock(bridge_channel->chan);
409         data->id = ast_framehook_attach(bridge_channel->chan, &hook);
410         ast_channel_unlock(bridge_channel->chan);
411         if (data->id < 0) {
412                 ao2_cleanup(data);
413                 return -1;
414         }
415
416         bridge_channel->tech_pvt = data;
417
418         return 0;
419 }
420
421 /*! \brief Helper function which removes frame hook from bridge channel */
422 static void native_rtp_bridge_framehook_detach(struct ast_bridge_channel *bridge_channel)
423 {
424         RAII_VAR(struct native_rtp_bridge_data *, data, bridge_channel->tech_pvt, ao2_cleanup);
425
426         if (!data) {
427                 return;
428         }
429
430         ast_channel_lock(bridge_channel->chan);
431         ast_framehook_detach(bridge_channel->chan, data->id);
432         ast_channel_unlock(bridge_channel->chan);
433         bridge_channel->tech_pvt = NULL;
434 }
435
436 static int native_rtp_bridge_join(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
437 {
438         native_rtp_bridge_framehook_detach(bridge_channel);
439         if (native_rtp_bridge_framehook_attach(bridge_channel)) {
440                 return -1;
441         }
442
443         native_rtp_bridge_start(bridge, NULL);
444         return 0;
445 }
446
447 static void native_rtp_bridge_unsuspend(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
448 {
449         native_rtp_bridge_join(bridge, bridge_channel);
450 }
451
452 static void native_rtp_bridge_leave(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
453 {
454         struct ast_rtp_glue *glue;
455         RAII_VAR(struct ast_rtp_instance *, instance, NULL, ao2_cleanup);
456         RAII_VAR(struct ast_rtp_instance *, vinstance, NULL, ao2_cleanup);
457         RAII_VAR(struct ast_rtp_instance *, tinstance, NULL, ao2_cleanup);
458
459         native_rtp_bridge_framehook_detach(bridge_channel);
460
461         glue = ast_rtp_instance_get_glue(ast_channel_tech(bridge_channel->chan)->type);
462         if (!glue) {
463                 return;
464         }
465
466         glue->get_rtp_info(bridge_channel->chan, &instance);
467
468         if (glue->get_vrtp_info) {
469                 glue->get_vrtp_info(bridge_channel->chan, &vinstance);
470         }
471
472         if (glue->get_trtp_info) {
473                 glue->get_trtp_info(bridge_channel->chan, &tinstance);
474         }
475
476         /* Tear down P2P bridges */
477         if (instance) {
478                 ast_rtp_instance_set_bridged(instance, NULL);
479         }
480         if (vinstance) {
481                 ast_rtp_instance_set_bridged(vinstance, NULL);
482         }
483         if (tinstance) {
484                 ast_rtp_instance_set_bridged(tinstance, NULL);
485         }
486
487         /* Direct RTP may have occurred, tear it down */
488         glue->update_peer(bridge_channel->chan, NULL, NULL, NULL, NULL, 0);
489
490         native_rtp_bridge_stop(bridge, NULL);
491 }
492
493 static int native_rtp_bridge_write(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
494 {
495         return ast_bridge_queue_everyone_else(bridge, bridge_channel, frame);
496 }
497
498 static struct ast_bridge_technology native_rtp_bridge = {
499         .name = "native_rtp",
500         .capabilities = AST_BRIDGE_CAPABILITY_NATIVE,
501         .preference = AST_BRIDGE_PREFERENCE_BASE_NATIVE,
502         .join = native_rtp_bridge_join,
503         .unsuspend = native_rtp_bridge_unsuspend,
504         .leave = native_rtp_bridge_leave,
505         .suspend = native_rtp_bridge_leave,
506         .write = native_rtp_bridge_write,
507         .compatible = native_rtp_bridge_compatible,
508 };
509
510 static int unload_module(void)
511 {
512         ast_format_cap_destroy(native_rtp_bridge.format_capabilities);
513         return ast_bridge_technology_unregister(&native_rtp_bridge);
514 }
515
516 static int load_module(void)
517 {
518         if (!(native_rtp_bridge.format_capabilities = ast_format_cap_alloc(0))) {
519                 return AST_MODULE_LOAD_DECLINE;
520         }
521         ast_format_cap_add_all_by_type(native_rtp_bridge.format_capabilities, AST_FORMAT_TYPE_AUDIO);
522         ast_format_cap_add_all_by_type(native_rtp_bridge.format_capabilities, AST_FORMAT_TYPE_VIDEO);
523         ast_format_cap_add_all_by_type(native_rtp_bridge.format_capabilities, AST_FORMAT_TYPE_TEXT);
524
525         return ast_bridge_technology_register(&native_rtp_bridge);
526 }
527
528 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Native RTP bridging module");