Asterisk - The Open Source Telephony Project  GIT-master-a1fa8df
res_rtp_multicast.c
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1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 2009, Digium, Inc.
5  *
6  * Joshua Colp <jcolp@digium.com>
7  * Andreas 'MacBrody' Brodmann <andreas.brodmann@gmail.com>
8  *
9  * See http://www.asterisk.org for more information about
10  * the Asterisk project. Please do not directly contact
11  * any of the maintainers of this project for assistance;
12  * the project provides a web site, mailing lists and IRC
13  * channels for your use.
14  *
15  * This program is free software, distributed under the terms of
16  * the GNU General Public License Version 2. See the LICENSE file
17  * at the top of the source tree.
18  */
19 
20 /*!
21  * \file
22  *
23  * \brief Multicast RTP Engine
24  *
25  * \author Joshua Colp <jcolp@digium.com>
26  * \author Andreas 'MacBrody' Brodmann <andreas.brodmann@gmail.com>
27  *
28  * \ingroup rtp_engines
29  */
30 
31 /*** MODULEINFO
32  <support_level>core</support_level>
33  ***/
34 
35 #include "asterisk.h"
36 
37 #include <sys/time.h>
38 #include <signal.h>
39 #include <fcntl.h>
40 #include <math.h>
41 
42 #include "asterisk/pbx.h"
43 #include "asterisk/frame.h"
44 #include "asterisk/channel.h"
45 #include "asterisk/acl.h"
46 #include "asterisk/config.h"
47 #include "asterisk/lock.h"
48 #include "asterisk/utils.h"
49 #include "asterisk/cli.h"
50 #include "asterisk/manager.h"
51 #include "asterisk/unaligned.h"
52 #include "asterisk/module.h"
53 #include "asterisk/rtp_engine.h"
54 #include "asterisk/format_cache.h"
55 #include "asterisk/multicast_rtp.h"
56 #include "asterisk/app.h"
57 #include "asterisk/smoother.h"
58 
59 /*! Command value used for Linksys paging to indicate we are starting */
60 #define LINKSYS_MCAST_STARTCMD 6
61 
62 /*! Command value used for Linksys paging to indicate we are stopping */
63 #define LINKSYS_MCAST_STOPCMD 7
64 
65 /*! \brief Type of paging to do */
67  /*! Type has not been set yet */
69  /*! Simple multicast enabled client/receiver paging like Snom and Barix uses */
71  /*! More advanced Linksys type paging which requires a start and stop packet */
73 };
74 
75 /*! \brief Structure for a Linksys control packet */
77  /*! Unique identifier for the control packet */
78  uint32_t unique_id;
79  /*! Actual command in the control packet */
80  uint32_t command;
81  /*! IP address for the RTP */
82  uint32_t ip;
83  /*! Port for the RTP */
84  uint32_t port;
85 };
86 
87 /*! \brief Structure for a multicast paging instance */
88 struct multicast_rtp {
89  /*! TYpe of multicast paging this instance is doing */
91  /*! Socket used for sending the audio on */
92  int socket;
93  /*! Synchronization source value, used when creating/sending the RTP packet */
94  unsigned int ssrc;
95  /*! Sequence number, used when creating/sending the RTP packet */
96  uint16_t seqno;
97  unsigned int lastts;
98  struct timeval txcore;
100 };
101 
102 #define MAX_TIMESTAMP_SKEW 640
103 
104 enum {
105  OPT_CODEC = (1 << 0),
106  OPT_LOOP = (1 << 1),
107  OPT_TTL = (1 << 2),
108  OPT_IF = (1 << 3),
109 };
110 
111 enum {
117 };
118 
120  /*! Set the codec to be used for multicast RTP */
122  /*! Set whether multicast RTP is looped back to the sender */
124  /*! Set the hop count for multicast RTP */
126  /*! Set the interface from which multicast RTP is sent */
129 
131  char *type;
132  char *options;
133  struct ast_format *fmt;
134  struct ast_flags opts;
135  char *opt_args[OPT_ARG_ARRAY_SIZE];
136  /*! The type and options are stored in this buffer */
137  char buf[0];
138 };
139 
141  const char *options)
142 {
143  struct ast_multicast_rtp_options *mcast_options;
144  char *pos;
145 
146  mcast_options = ast_calloc(1, sizeof(*mcast_options)
147  + strlen(type)
148  + strlen(S_OR(options, "")) + 2);
149  if (!mcast_options) {
150  return NULL;
151  }
152 
153  pos = mcast_options->buf;
154 
155  /* Safe */
156  strcpy(pos, type);
157  mcast_options->type = pos;
158  pos += strlen(type) + 1;
159 
160  if (!ast_strlen_zero(options)) {
161  strcpy(pos, options); /* Safe */
162  }
163  mcast_options->options = pos;
164 
165  if (ast_app_parse_options(multicast_rtp_options, &mcast_options->opts,
166  mcast_options->opt_args, mcast_options->options)) {
167  ast_log(LOG_WARNING, "Error parsing multicast RTP options\n");
168  ast_multicast_rtp_free_options(mcast_options);
169  return NULL;
170  }
171 
172  return mcast_options;
173 }
174 
176 {
177  ast_free(mcast_options);
178 }
179 
181 {
182  if (ast_test_flag(&mcast_options->opts, OPT_CODEC)
183  && !ast_strlen_zero(mcast_options->opt_args[OPT_ARG_CODEC])) {
184  return ast_format_cache_get(mcast_options->opt_args[OPT_ARG_CODEC]);
185  }
186 
187  return NULL;
188 }
189 
190 /* Forward Declarations */
191 static int multicast_rtp_new(struct ast_rtp_instance *instance, struct ast_sched_context *sched, struct ast_sockaddr *addr, void *data);
192 static int multicast_rtp_activate(struct ast_rtp_instance *instance);
193 static int multicast_rtp_destroy(struct ast_rtp_instance *instance);
194 static int multicast_rtp_write(struct ast_rtp_instance *instance, struct ast_frame *frame);
195 static struct ast_frame *multicast_rtp_read(struct ast_rtp_instance *instance, int rtcp);
196 
197 /* RTP Engine Declaration */
199  .name = "multicast",
200  .new = multicast_rtp_new,
201  .activate = multicast_rtp_activate,
202  .destroy = multicast_rtp_destroy,
203  .write = multicast_rtp_write,
204  .read = multicast_rtp_read,
205 };
206 
207 static int set_type(struct multicast_rtp *multicast, const char *type)
208 {
209  if (!strcasecmp(type, "basic")) {
210  multicast->type = MULTICAST_TYPE_BASIC;
211  } else if (!strcasecmp(type, "linksys")) {
212  multicast->type = MULTICAST_TYPE_LINKSYS;
213  } else {
214  ast_log(LOG_WARNING, "Unrecognized multicast type '%s' specified.\n", type);
215  return -1;
216  }
217 
218  return 0;
219 }
220 
221 static void set_ttl(int sock, const char *ttl_str)
222 {
223  int ttl;
224 
225  if (ast_strlen_zero(ttl_str)) {
226  return;
227  }
228 
229  ast_debug(3, "Setting multicast TTL to %s\n", ttl_str);
230 
231  if (sscanf(ttl_str, "%30d", &ttl) < 1) {
232  ast_log(LOG_WARNING, "Invalid multicast ttl option '%s'\n", ttl_str);
233  return;
234  }
235 
236  if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0) {
237  ast_log(LOG_WARNING, "Could not set multicast ttl to '%s': %s\n",
238  ttl_str, strerror(errno));
239  }
240 }
241 
242 static void set_loop(int sock, const char *loop_str)
243 {
244  unsigned char loop;
245 
246  if (ast_strlen_zero(loop_str)) {
247  return;
248  }
249 
250  ast_debug(3, "Setting multicast loop to %s\n", loop_str);
251 
252  if (sscanf(loop_str, "%30hhu", &loop) < 1) {
253  ast_log(LOG_WARNING, "Invalid multicast loop option '%s'\n", loop_str);
254  return;
255  }
256 
257  if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)) < 0) {
258  ast_log(LOG_WARNING, "Could not set multicast loop to '%s': %s\n",
259  loop_str, strerror(errno));
260  }
261 }
262 
263 static void set_if(int sock, const char *if_str)
264 {
265  struct in_addr iface;
266 
267  if (ast_strlen_zero(if_str)) {
268  return;
269  }
270 
271  ast_debug(3, "Setting multicast if to %s\n", if_str);
272 
273  if (!inet_aton(if_str, &iface)) {
274  ast_log(LOG_WARNING, "Cannot parse if option '%s'\n", if_str);
275  }
276 
277  if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)) < 0) {
278  ast_log(LOG_WARNING, "Could not set multicast if to '%s': %s\n",
279  if_str, strerror(errno));
280  }
281 }
282 
283 /*! \brief Function called to create a new multicast instance */
284 static int multicast_rtp_new(struct ast_rtp_instance *instance, struct ast_sched_context *sched, struct ast_sockaddr *addr, void *data)
285 {
286  struct multicast_rtp *multicast;
287  struct ast_multicast_rtp_options *mcast_options = data;
288 
289  if (!(multicast = ast_calloc(1, sizeof(*multicast)))) {
290  return -1;
291  }
292 
293  if (set_type(multicast, mcast_options->type)) {
294  ast_free(multicast);
295  return -1;
296  }
297 
298  if ((multicast->socket = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
299  ast_free(multicast);
300  return -1;
301  }
302 
303  if (ast_test_flag(&mcast_options->opts, OPT_LOOP)) {
304  set_loop(multicast->socket, mcast_options->opt_args[OPT_ARG_LOOP]);
305  }
306 
307  if (ast_test_flag(&mcast_options->opts, OPT_TTL)) {
308  set_ttl(multicast->socket, mcast_options->opt_args[OPT_ARG_TTL]);
309  }
310 
311  if (ast_test_flag(&mcast_options->opts, OPT_IF)) {
312  set_if(multicast->socket, mcast_options->opt_args[OPT_ARG_IF]);
313  }
314 
315  multicast->ssrc = ast_random();
316 
317  ast_rtp_instance_set_data(instance, multicast);
318 
319  return 0;
320 }
321 
322 static int rtp_get_rate(struct ast_format *format)
323 {
325  8000 : ast_format_get_sample_rate(format);
326 }
327 
328 static unsigned int calc_txstamp(struct multicast_rtp *rtp, struct timeval *delivery)
329 {
330  struct timeval t;
331  long ms;
332 
333  if (ast_tvzero(rtp->txcore)) {
334  rtp->txcore = ast_tvnow();
335  rtp->txcore.tv_usec -= rtp->txcore.tv_usec % 20000;
336  }
337 
338  t = (delivery && !ast_tvzero(*delivery)) ? *delivery : ast_tvnow();
339  if ((ms = ast_tvdiff_ms(t, rtp->txcore)) < 0) {
340  ms = 0;
341  }
342  rtp->txcore = t;
343 
344  return (unsigned int) ms;
345 }
346 
347 /*! \brief Helper function which populates a control packet with useful information and sends it */
348 static int multicast_send_control_packet(struct ast_rtp_instance *instance, struct multicast_rtp *multicast, int command)
349 {
350  struct multicast_control_packet control_packet = { .unique_id = htonl((u_long)time(NULL)),
351  .command = htonl(command),
352  };
353  struct ast_sockaddr control_address, remote_address;
354 
355  ast_rtp_instance_get_local_address(instance, &control_address);
356  ast_rtp_instance_get_remote_address(instance, &remote_address);
357 
358  /* Ensure the user of us have given us both the control address and destination address */
359  if (ast_sockaddr_isnull(&control_address) ||
360  ast_sockaddr_isnull(&remote_address)) {
361  return -1;
362  }
363 
364  /* The protocol only supports IPv4. */
365  if (ast_sockaddr_is_ipv6(&remote_address)) {
366  ast_log(LOG_WARNING, "Cannot send control packet for IPv6 "
367  "remote address.\n");
368  return -1;
369  }
370 
371  control_packet.ip = htonl(ast_sockaddr_ipv4(&remote_address));
372  control_packet.port = htonl(ast_sockaddr_port(&remote_address));
373 
374  /* Based on a recommendation by Brian West who did the FreeSWITCH implementation we send control packets twice */
375  ast_sendto(multicast->socket, &control_packet, sizeof(control_packet), 0, &control_address);
376  ast_sendto(multicast->socket, &control_packet, sizeof(control_packet), 0, &control_address);
377 
378  return 0;
379 }
380 
381 /*! \brief Function called to indicate that audio is now going to flow */
382 static int multicast_rtp_activate(struct ast_rtp_instance *instance)
383 {
384  struct multicast_rtp *multicast = ast_rtp_instance_get_data(instance);
385 
386  if (multicast->type != MULTICAST_TYPE_LINKSYS) {
387  return 0;
388  }
389 
390  return multicast_send_control_packet(instance, multicast, LINKSYS_MCAST_STARTCMD);
391 }
392 
393 /*! \brief Function called to destroy a multicast instance */
394 static int multicast_rtp_destroy(struct ast_rtp_instance *instance)
395 {
396  struct multicast_rtp *multicast = ast_rtp_instance_get_data(instance);
397 
398  if (multicast->type == MULTICAST_TYPE_LINKSYS) {
400  }
401 
402  if (multicast->smoother) {
403  ast_smoother_free(multicast->smoother);
404  }
405 
406  close(multicast->socket);
407 
408  ast_free(multicast);
409 
410  return 0;
411 }
412 
413 static int rtp_raw_write(struct ast_rtp_instance *instance, struct ast_frame *frame, int codec)
414 {
415  struct multicast_rtp *multicast = ast_rtp_instance_get_data(instance);
416  unsigned int ms = calc_txstamp(multicast, &frame->delivery);
417  unsigned char *rtpheader;
418  struct ast_sockaddr remote_address = { {0,} };
419  int rate = rtp_get_rate(frame->subclass.format) / 1000;
420  int hdrlen = 12, mark = 0;
421 
423  frame->samples /= 2;
424  }
425 
427  multicast->lastts = frame->ts * rate;
428  } else {
429  /* Try to predict what our timestamp should be */
430  int pred = multicast->lastts + frame->samples;
431 
432  /* Calculate last TS */
433  multicast->lastts = multicast->lastts + ms * rate;
434  if (ast_tvzero(frame->delivery)) {
435  int delta = abs((int) multicast->lastts - pred);
436  if (delta < MAX_TIMESTAMP_SKEW) {
437  multicast->lastts = pred;
438  } else {
439  ast_debug(3, "Difference is %d, ms is %u\n", delta, ms);
440  mark = 1;
441  }
442  }
443  }
444 
445  /* Construct an RTP header for our packet */
446  rtpheader = (unsigned char *)(frame->data.ptr - hdrlen);
447 
448  put_unaligned_uint32(rtpheader, htonl((2 << 30) | (codec << 16) | (multicast->seqno) | (mark << 23)));
449  put_unaligned_uint32(rtpheader + 4, htonl(multicast->lastts));
450  put_unaligned_uint32(rtpheader + 8, htonl(multicast->ssrc));
451 
452  /* Increment sequence number and wrap to 0 if it overflows 16 bits. */
453  multicast->seqno = 0xFFFF & (multicast->seqno + 1);
454 
455  /* Finally send it out to the eager phones listening for us */
456  ast_rtp_instance_get_remote_address(instance, &remote_address);
457 
458  if (ast_sendto(multicast->socket, (void *) rtpheader, frame->datalen + hdrlen, 0, &remote_address) < 0) {
459  ast_log(LOG_ERROR, "Multicast RTP Transmission error to %s: %s\n",
460  ast_sockaddr_stringify(&remote_address),
461  strerror(errno));
462  return -1;
463  }
464 
465  return 0;
466 }
467 
468 /*! \brief Function called to broadcast some audio on a multicast instance */
469 static int multicast_rtp_write(struct ast_rtp_instance *instance, struct ast_frame *frame)
470 {
471  struct multicast_rtp *multicast = ast_rtp_instance_get_data(instance);
472  struct ast_format *format;
473  struct ast_frame *f;
474  int codec;
475 
476  /* We only accept audio, nothing else */
477  if (frame->frametype != AST_FRAME_VOICE) {
478  return 0;
479  }
480 
481  /* Grab the actual payload number for when we create the RTP packet */
483  1, frame->subclass.format, 0);
484  if (codec < 0) {
485  return -1;
486  }
487 
488  format = frame->subclass.format;
489  if (!multicast->smoother && ast_format_can_be_smoothed(format)) {
490  unsigned int smoother_flags = ast_format_get_smoother_flags(format);
491  unsigned int framing_ms = ast_rtp_codecs_get_framing(ast_rtp_instance_get_codecs(instance));
492 
493  if (!framing_ms && (smoother_flags & AST_SMOOTHER_FLAG_FORCED)) {
494  framing_ms = ast_format_get_default_ms(format);
495  }
496 
497  if (framing_ms) {
498  multicast->smoother = ast_smoother_new((framing_ms * ast_format_get_minimum_bytes(format)) / ast_format_get_minimum_ms(format));
499  if (!multicast->smoother) {
500  ast_log(LOG_WARNING, "Unable to create smoother: format %s ms: %u len %u\n",
501  ast_format_get_name(format), framing_ms, ast_format_get_minimum_bytes(format));
502  return -1;
503  }
504  ast_smoother_set_flags(multicast->smoother, smoother_flags);
505  }
506  }
507 
508  if (multicast->smoother) {
510  ast_smoother_feed_be(multicast->smoother, frame);
511  } else {
512  ast_smoother_feed(multicast->smoother, frame);
513  }
514 
515  while ((f = ast_smoother_read(multicast->smoother)) && f->data.ptr) {
516  rtp_raw_write(instance, f, codec);
517  }
518  } else {
519  int hdrlen = 12;
520 
521  /* If we do not have space to construct an RTP header duplicate the frame so we get some */
522  if (frame->offset < hdrlen) {
523  f = ast_frdup(frame);
524  } else {
525  f = frame;
526  }
527 
528  if (f->data.ptr) {
529  rtp_raw_write(instance, f, codec);
530  }
531 
532  if (f != frame) {
533  ast_frfree(f);
534  }
535  }
536 
537  return 0;
538 }
539 
540 /*! \brief Function called to read from a multicast instance */
541 static struct ast_frame *multicast_rtp_read(struct ast_rtp_instance *instance, int rtcp)
542 {
543  return &ast_null_frame;
544 }
545 
546 static int load_module(void)
547 {
548  if (ast_rtp_engine_register(&multicast_rtp_engine)) {
550  }
551 
553 }
554 
555 static int unload_module(void)
556 {
557  ast_rtp_engine_unregister(&multicast_rtp_engine);
558 
559  return 0;
560 }
561 
563  .support_level = AST_MODULE_SUPPORT_CORE,
564  .load = load_module,
565  .unload = unload_module,
566  .load_pri = AST_MODPRI_CHANNEL_DEPEND,
567 );
static const char type[]
Definition: chan_ooh323.c:109
#define MAX_TIMESTAMP_SKEW
struct ast_multicast_rtp_options * ast_multicast_rtp_create_options(const char *type, const char *options)
Create multicast RTP options.
static int multicast_send_control_packet(struct ast_rtp_instance *instance, struct multicast_rtp *multicast, int command)
Helper function which populates a control packet with useful information and sends it...
#define ast_frdup(fr)
Copies a frame.
Structure for a Linksys control packet.
ssize_t ast_sendto(int sockfd, const void *buf, size_t len, int flags, const struct ast_sockaddr *dest_addr)
Wrapper around sendto(2) that uses ast_sockaddr.
Definition: netsock2.c:614
static int unload_module(void)
Asterisk locking-related definitions:
multicast_type
Type of paging to do.
Asterisk main include file. File version handling, generic pbx functions.
#define ast_rtp_engine_register(engine)
Definition: rtp_engine.h:794
static void set_if(int sock, const char *if_str)
#define ast_smoother_feed(s, f)
Definition: smoother.h:76
struct ast_smoother * ast_smoother_new(int bytes)
Definition: smoother.c:108
#define ast_test_flag(p, flag)
Definition: utils.h:63
#define BEGIN_OPTIONS
char buf[BUFSIZE]
Definition: eagi_proxy.c:66
struct ast_rtp_codecs * ast_rtp_instance_get_codecs(struct ast_rtp_instance *instance)
Get the codecs structure of an RTP instance.
Definition: rtp_engine.c:727
#define LOG_WARNING
Definition: logger.h:274
enum multicast_type type
int ast_tvzero(const struct timeval t)
Returns true if the argument is 0,0.
Definition: time.h:108
static unsigned int calc_txstamp(struct multicast_rtp *rtp, struct timeval *delivery)
static void set_ttl(int sock, const char *ttl_str)
static void put_unaligned_uint32(void *p, unsigned int datum)
Definition: unaligned.h:58
Definition: sched.c:76
Definition of a media format.
Definition: format.c:43
uint32_t ast_sockaddr_ipv4(const struct ast_sockaddr *addr)
Get an IPv4 address of an ast_sockaddr.
Definition: netsock2.c:491
void ast_multicast_rtp_free_options(struct ast_multicast_rtp_options *mcast_options)
Free multicast RTP options.
struct timeval ast_tvnow(void)
Returns current timeval. Meant to replace calls to gettimeofday().
Definition: time.h:150
const char * ast_format_get_name(const struct ast_format *format)
Get the name associated with a format.
Definition: format.c:334
int64_t ast_tvdiff_ms(struct timeval end, struct timeval start)
Computes the difference (in milliseconds) between two struct timeval instances.
Definition: time.h:98
#define NULL
Definition: resample.c:96
struct ast_format * ast_format_g722
Built-in cached g722 format.
Definition: format_cache.c:106
Socket address structure.
Definition: netsock2.h:97
Asterisk internal frame definitions.
int ast_rtp_codecs_payload_code_tx(struct ast_rtp_codecs *codecs, int asterisk_format, const struct ast_format *format, int code)
Retrieve a tx mapped payload type based on whether it is an Asterisk format and the code...
Definition: rtp_engine.c:1928
unsigned int ast_rtp_codecs_get_framing(struct ast_rtp_codecs *codecs)
Get the framing used for a set of codecs.
Definition: rtp_engine.c:1569
struct ast_frame_subclass subclass
#define ast_format_cache_get(name)
Definition: format_cache.h:281
int ast_format_get_smoother_flags(const struct ast_format *format)
Get smoother flags for this format.
Definition: format.c:349
Utility functions.
#define AST_APP_OPTIONS(holder, options...)
Declares an array of options for an application.
static int ast_sockaddr_isnull(const struct ast_sockaddr *addr)
Checks if the ast_sockaddr is null. "null" in this sense essentially means uninitialized, or having a 0 length.
Definition: netsock2.h:127
#define ast_sockaddr_port(addr)
Get the port number of a socket address.
Definition: netsock2.h:521
Configuration File Parser.
void ast_smoother_free(struct ast_smoother *s)
Definition: smoother.c:220
Structure for a multicast paging instance.
unsigned int lastts
static const struct ast_app_option multicast_rtp_options[128]
#define ast_debug(level,...)
Log a DEBUG message.
Definition: logger.h:444
#define ast_log
Definition: astobj2.c:42
Handle unaligned data access.
char * opt_args[OPT_ARG_ARRAY_SIZE]
enum ast_format_cmp_res ast_format_cmp(const struct ast_format *format1, const struct ast_format *format2)
Compare two formats.
Definition: format.c:201
General Asterisk PBX channel definitions.
int ast_rtp_engine_unregister(struct ast_rtp_engine *engine)
Unregister an RTP engine.
Definition: rtp_engine.c:364
void ast_rtp_instance_set_data(struct ast_rtp_instance *instance, void *data)
Set the data portion of an RTP instance.
Definition: rtp_engine.c:558
struct ast_smoother * smoother
unsigned int ssrc
static force_inline int attribute_pure ast_strlen_zero(const char *s)
Definition: strings.h:65
Access Control of various sorts.
#define AST_SMOOTHER_FLAG_FORCED
Definition: smoother.h:36
Asterisk internal frame definitions.
long int ast_random(void)
Definition: main/utils.c:2064
union ast_frame::@250 data
unsigned int ast_format_get_minimum_bytes(const struct ast_format *format)
Get the minimum number of bytes expected in a frame for this format.
Definition: format.c:374
static void set_loop(int sock, const char *loop_str)
#define LINKSYS_MCAST_STARTCMD
int ast_app_parse_options(const struct ast_app_option *options, struct ast_flags *flags, char **args, char *optstr)
Parses a string containing application options and sets flags/arguments.
Definition: main/app.c:2846
Core PBX routines and definitions.
static int multicast_rtp_write(struct ast_rtp_instance *instance, struct ast_frame *frame)
Function called to broadcast some audio on a multicast instance.
int ast_format_can_be_smoothed(const struct ast_format *format)
Get whether or not the format can be smoothed.
Definition: format.c:344
The AMI - Asterisk Manager Interface - is a TCP protocol created to manage Asterisk with third-party ...
static int set_type(struct multicast_rtp *multicast, const char *type)
#define ast_smoother_feed_be(s, f)
Definition: smoother.h:81
#define LOG_ERROR
Definition: logger.h:285
static struct ast_rtp_engine multicast_rtp_engine
#define AST_APP_OPTION_ARG(option, flagno, argno)
Declares an application option that accepts an argument.
static int multicast_rtp_activate(struct ast_rtp_instance *instance)
Function called to indicate that audio is now going to flow.
int errno
#define LINKSYS_MCAST_STOPCMD
static char * ast_sockaddr_stringify(const struct ast_sockaddr *addr)
Wrapper around ast_sockaddr_stringify_fmt() with default format.
Definition: netsock2.h:260
struct ast_format * ast_multicast_rtp_options_get_format(struct ast_multicast_rtp_options *mcast_options)
Get format specified in multicast options.
static int rtp_raw_write(struct ast_rtp_instance *instance, struct ast_frame *frame, int codec)
#define ast_free(a)
Definition: astmm.h:182
#define ast_calloc(num, len)
A wrapper for calloc()
Definition: astmm.h:204
void * ast_rtp_instance_get_data(struct ast_rtp_instance *instance)
Get the data portion of an RTP instance.
Definition: rtp_engine.c:563
unsigned int ast_format_get_default_ms(const struct ast_format *format)
Get the default framing size (in milliseconds) for a format.
Definition: format.c:359
static struct ast_frame * multicast_rtp_read(struct ast_rtp_instance *instance, int rtcp)
Function called to read from a multicast instance.
Module has failed to load, may be in an inconsistent state.
Definition: module.h:78
const char * name
Definition: rtp_engine.h:616
static int rtp_get_rate(struct ast_format *format)
void ast_rtp_instance_get_local_address(struct ast_rtp_instance *instance, struct ast_sockaddr *address)
Get the local address that we are expecting RTP on.
Definition: rtp_engine.c:643
Structure used to handle boolean flags.
Definition: utils.h:199
int ast_smoother_test_flag(struct ast_smoother *s, int flag)
Definition: smoother.c:128
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS|AST_MODFLAG_LOAD_ORDER, "HTTP Phone Provisioning",.support_level=AST_MODULE_SUPPORT_EXTENDED,.load=load_module,.unload=unload_module,.reload=reload,.load_pri=AST_MODPRI_CHANNEL_DEPEND,.requires="http",)
struct timeval delivery
struct ast_frame ast_null_frame
Definition: main/frame.c:79
#define AST_SMOOTHER_FLAG_BE
Definition: smoother.h:35
static int multicast_rtp_destroy(struct ast_rtp_instance *instance)
Function called to destroy a multicast instance.
struct timeval txcore
void ast_smoother_set_flags(struct ast_smoother *smoother, int flags)
Definition: smoother.c:123
#define abs(x)
Definition: f2c.h:195
static int load_module(void)
Standard Command Line Interface.
struct ast_frame * ast_smoother_read(struct ast_smoother *s)
Definition: smoother.c:169
#define S_OR(a, b)
returns the equivalent of logic or for strings: first one if not empty, otherwise second one...
Definition: strings.h:79
#define END_OPTIONS
#define ast_frfree(fr)
unsigned int ast_format_get_sample_rate(const struct ast_format *format)
Get the sample rate of a media format.
Definition: format.c:379
Data structure associated with a single frame of data.
static int multicast_rtp_new(struct ast_rtp_instance *instance, struct ast_sched_context *sched, struct ast_sockaddr *addr, void *data)
Function called to create a new multicast instance.
enum ast_frame_type frametype
static struct test_options options
struct ast_format * format
unsigned int ast_format_get_minimum_ms(const struct ast_format *format)
Get the minimum amount of media carried in this format.
Definition: format.c:364
#define ASTERISK_GPL_KEY
The text the key() function should return.
Definition: module.h:46
Pluggable RTP Architecture.
Asterisk module definitions.
static snd_pcm_format_t format
Definition: chan_alsa.c:106
#define ast_rtp_instance_get_remote_address(instance, address)
Get the address of the remote endpoint that we are sending RTP to.
Definition: rtp_engine.h:1192
Application convenience functions, designed to give consistent look and feel to Asterisk apps...
int inet_aton(const char *cp, struct in_addr *pin)
int ast_sockaddr_is_ipv6(const struct ast_sockaddr *addr)
Determine if this is an IPv6 address.
Definition: netsock2.c:524
Media Format Cache API.