1 /*
2 * RTP network protocol
3 * Copyright (c) 2002 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * RTP protocol
25 */
26
27 #include "libavutil/parseutils.h"
28 #include "libavutil/avstring.h"
29 #include "libavutil/opt.h"
30 #include "avformat.h"
31 #include "avio_internal.h"
32 #include "rtp.h"
33 #include "rtpproto.h"
34 #include "url.h"
35 #include "ip.h"
36
37 #include <stdarg.h>
38 #include "internal.h"
39 #include "network.h"
40 #include "os_support.h"
41 #include <fcntl.h>
42 #if HAVE_POLL_H
43 #include <poll.h>
44 #endif
45
46 typedef struct RTPContext {
47 const AVClass *class;
48 URLContext *rtp_hd, *rtcp_hd, *fec_hd;
49 int rtp_fd, rtcp_fd;
50 IPSourceFilters filters;
51 int write_to_source;
52 struct sockaddr_storage last_rtp_source, last_rtcp_source;
53 socklen_t last_rtp_source_len, last_rtcp_source_len;
54 int ttl;
55 int buffer_size;
56 int rtcp_port, local_rtpport, local_rtcpport;
57 int connect;
58 int pkt_size;
59 int dscp;
60 char *sources;
61 char *block;
62 char *fec_options_str;
63 int64_t rw_timeout;
64 char *localaddr;
65 } RTPContext;
66
67 #define OFFSET(x) offsetof(RTPContext, x)
68 #define D AV_OPT_FLAG_DECODING_PARAM
69 #define E AV_OPT_FLAG_ENCODING_PARAM
70 static const AVOption options[] = {
71 { "ttl", "Time to live (multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, .flags = D|E },
72 { "buffer_size", "Send/Receive buffer size (in bytes)", OFFSET(buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
73 { "rtcp_port", "Custom rtcp port", OFFSET(rtcp_port), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
74 { "local_rtpport", "Local rtp port", OFFSET(local_rtpport), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
75 { "local_rtcpport", "Local rtcp port", OFFSET(local_rtcpport), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
76 { "connect", "Connect socket", OFFSET(connect), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, .flags = D|E },
77 { "write_to_source", "Send packets to the source address of the latest received packet", OFFSET(write_to_source), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, .flags = D|E },
78 { "pkt_size", "Maximum packet size", OFFSET(pkt_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
79 { "dscp", "DSCP class", OFFSET(dscp), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
80 { "timeout", "set timeout (in microseconds) of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
81 { "sources", "Source list", OFFSET(sources), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
82 { "block", "Block list", OFFSET(block), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
83 { "fec", "FEC", OFFSET(fec_options_str), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = E },
84 { "localaddr", "Local address", OFFSET(localaddr), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
85 { NULL }
86 };
87
88 static const AVClass rtp_class = {
89 .class_name = "rtp",
90 .item_name = av_default_item_name,
91 .option = options,
92 .version = LIBAVUTIL_VERSION_INT,
93 };
94
95 /**
96 * If no filename is given to av_open_input_file because you want to
97 * get the local port first, then you must call this function to set
98 * the remote server address.
99 *
100 * @param h media file context
101 * @param uri of the remote server
102 * @return zero if no error.
103 */
104
ff_rtp_set_remote_url(URLContext *h, const char *uri)105 int ff_rtp_set_remote_url(URLContext *h, const char *uri)
106 {
107 RTPContext *s = h->priv_data;
108 char hostname[256];
109 int port, rtcp_port;
110 const char *p;
111
112 char buf[1024];
113 char path[1024];
114
115 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
116 path, sizeof(path), uri);
117 rtcp_port = port + 1;
118
119 p = strchr(uri, '?');
120 if (p) {
121 if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
122 rtcp_port = strtol(buf, NULL, 10);
123 }
124 }
125
126 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
127 ff_udp_set_remote_url(s->rtp_hd, buf);
128
129 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, rtcp_port, "%s", path);
130 ff_udp_set_remote_url(s->rtcp_hd, buf);
131 return 0;
132 }
133
get_port(const struct sockaddr_storage *ss)134 static int get_port(const struct sockaddr_storage *ss)
135 {
136 if (ss->ss_family == AF_INET)
137 return ntohs(((const struct sockaddr_in *)ss)->sin_port);
138 #if HAVE_STRUCT_SOCKADDR_IN6
139 if (ss->ss_family == AF_INET6)
140 return ntohs(((const struct sockaddr_in6 *)ss)->sin6_port);
141 #endif
142 return 0;
143 }
144
set_port(struct sockaddr_storage *ss, int port)145 static void set_port(struct sockaddr_storage *ss, int port)
146 {
147 if (ss->ss_family == AF_INET)
148 ((struct sockaddr_in *)ss)->sin_port = htons(port);
149 #if HAVE_STRUCT_SOCKADDR_IN6
150 else if (ss->ss_family == AF_INET6)
151 ((struct sockaddr_in6 *)ss)->sin6_port = htons(port);
152 #endif
153 }
154
155 /**
156 * add option to url of the form:
157 * "http://host:port/path?option1=val1&option2=val2...
158 */
159
url_add_option(char *buf, int buf_size, const char *fmt, ...)160 static av_printf_format(3, 4) void url_add_option(char *buf, int buf_size, const char *fmt, ...)
161 {
162 char buf1[1024];
163 va_list ap;
164
165 va_start(ap, fmt);
166 if (strchr(buf, '?'))
167 av_strlcat(buf, "&", buf_size);
168 else
169 av_strlcat(buf, "?", buf_size);
170 vsnprintf(buf1, sizeof(buf1), fmt, ap);
171 av_strlcat(buf, buf1, buf_size);
172 va_end(ap);
173 }
174
build_udp_url(RTPContext *s, char *buf, int buf_size, const char *hostname, const char *localaddr, int port, int local_port, const char *include_sources, const char *exclude_sources)175 static void build_udp_url(RTPContext *s,
176 char *buf, int buf_size,
177 const char *hostname,
178 const char *localaddr,
179 int port, int local_port,
180 const char *include_sources,
181 const char *exclude_sources)
182 {
183 ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
184 if (local_port >= 0)
185 url_add_option(buf, buf_size, "localport=%d", local_port);
186 if (s->ttl >= 0)
187 url_add_option(buf, buf_size, "ttl=%d", s->ttl);
188 if (s->buffer_size >= 0)
189 url_add_option(buf, buf_size, "buffer_size=%d", s->buffer_size);
190 if (s->pkt_size >= 0)
191 url_add_option(buf, buf_size, "pkt_size=%d", s->pkt_size);
192 if (s->connect)
193 url_add_option(buf, buf_size, "connect=1");
194 if (s->dscp >= 0)
195 url_add_option(buf, buf_size, "dscp=%d", s->dscp);
196 url_add_option(buf, buf_size, "fifo_size=0");
197 if (include_sources && include_sources[0])
198 url_add_option(buf, buf_size, "sources=%s", include_sources);
199 if (exclude_sources && exclude_sources[0])
200 url_add_option(buf, buf_size, "block=%s", exclude_sources);
201 if (localaddr && localaddr[0])
202 url_add_option(buf, buf_size, "localaddr=%s", localaddr);
203 }
204
205 /**
206 * url syntax: rtp://host:port[?option=val...]
207 * option: 'ttl=n' : set the ttl value (for multicast only)
208 * 'rtcpport=n' : set the remote rtcp port to n
209 * 'localrtpport=n' : set the local rtp port to n
210 * 'localrtcpport=n' : set the local rtcp port to n
211 * 'pkt_size=n' : set max packet size
212 * 'connect=0/1' : do a connect() on the UDP socket
213 * 'sources=ip[,ip]' : list allowed source IP addresses
214 * 'block=ip[,ip]' : list disallowed source IP addresses
215 * 'write_to_source=0/1' : send packets to the source address of the latest received packet
216 * 'dscp=n' : set DSCP value to n (QoS)
217 * deprecated option:
218 * 'localport=n' : set the local port to n
219 *
220 * if rtcpport isn't set the rtcp port will be the rtp port + 1
221 * if local rtp port isn't set any available port will be used for the local
222 * rtp and rtcp ports
223 * if the local rtcp port is not set it will be the local rtp port + 1
224 */
225
rtp_open(URLContext *h, const char *uri, int flags)226 static int rtp_open(URLContext *h, const char *uri, int flags)
227 {
228 RTPContext *s = h->priv_data;
229 AVDictionary *fec_opts = NULL;
230 int rtp_port;
231 char hostname[256], include_sources[1024] = "", exclude_sources[1024] = "";
232 char *sources = include_sources, *block = exclude_sources;
233 char *fec_protocol = NULL;
234 char buf[1024];
235 char path[1024];
236 const char *p;
237 int i, max_retry_count = 3;
238 int rtcpflags;
239
240 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
241 path, sizeof(path), uri);
242 /* extract parameters */
243 if (s->rtcp_port < 0)
244 s->rtcp_port = rtp_port + 1;
245
246 p = strchr(uri, '?');
247 if (p) {
248 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
249 s->ttl = strtol(buf, NULL, 10);
250 }
251 if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
252 s->rtcp_port = strtol(buf, NULL, 10);
253 }
254 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
255 s->local_rtpport = strtol(buf, NULL, 10);
256 }
257 if (av_find_info_tag(buf, sizeof(buf), "localrtpport", p)) {
258 s->local_rtpport = strtol(buf, NULL, 10);
259 }
260 if (av_find_info_tag(buf, sizeof(buf), "localrtcpport", p)) {
261 s->local_rtcpport = strtol(buf, NULL, 10);
262 }
263 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
264 s->pkt_size = strtol(buf, NULL, 10);
265 }
266 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
267 s->connect = strtol(buf, NULL, 10);
268 }
269 if (av_find_info_tag(buf, sizeof(buf), "write_to_source", p)) {
270 s->write_to_source = strtol(buf, NULL, 10);
271 }
272 if (av_find_info_tag(buf, sizeof(buf), "dscp", p)) {
273 s->dscp = strtol(buf, NULL, 10);
274 }
275 if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
276 s->rw_timeout = strtol(buf, NULL, 10);
277 }
278 if (av_find_info_tag(buf, sizeof(buf), "sources", p)) {
279 av_strlcpy(include_sources, buf, sizeof(include_sources));
280 ff_ip_parse_sources(h, buf, &s->filters);
281 } else {
282 ff_ip_parse_sources(h, s->sources, &s->filters);
283 sources = s->sources;
284 }
285 if (av_find_info_tag(buf, sizeof(buf), "block", p)) {
286 av_strlcpy(exclude_sources, buf, sizeof(exclude_sources));
287 ff_ip_parse_blocks(h, buf, &s->filters);
288 } else {
289 ff_ip_parse_blocks(h, s->block, &s->filters);
290 block = s->block;
291 }
292 if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
293 av_freep(&s->localaddr);
294 s->localaddr = av_strdup(buf);
295 if (!s->localaddr)
296 goto fail;
297 }
298 }
299 if (s->rw_timeout >= 0)
300 h->rw_timeout = s->rw_timeout;
301
302 if (s->fec_options_str) {
303 p = s->fec_options_str;
304
305 if (!(fec_protocol = av_get_token(&p, "="))) {
306 av_log(h, AV_LOG_ERROR, "Failed to parse the FEC protocol value\n");
307 goto fail;
308 }
309 if (strcmp(fec_protocol, "prompeg")) {
310 av_log(h, AV_LOG_ERROR, "Unsupported FEC protocol %s\n", fec_protocol);
311 goto fail;
312 }
313
314 p = s->fec_options_str + strlen(fec_protocol);
315 while (*p && *p == '=') p++;
316
317 if (av_dict_parse_string(&fec_opts, p, "=", ":", 0) < 0) {
318 av_log(h, AV_LOG_ERROR, "Failed to parse the FEC options\n");
319 goto fail;
320 }
321 if (s->ttl > 0) {
322 av_dict_set_int(&fec_opts, "ttl", s->ttl, 0);
323 }
324 }
325
326 for (i = 0; i < max_retry_count; i++) {
327 build_udp_url(s, buf, sizeof(buf),
328 hostname, s->localaddr, rtp_port, s->local_rtpport,
329 sources, block);
330 if (ffurl_open_whitelist(&s->rtp_hd, buf, flags, &h->interrupt_callback,
331 NULL, h->protocol_whitelist, h->protocol_blacklist, h) < 0)
332 goto fail;
333 s->local_rtpport = ff_udp_get_local_port(s->rtp_hd);
334 if(s->local_rtpport == 65535) {
335 s->local_rtpport = -1;
336 continue;
337 }
338 rtcpflags = flags | AVIO_FLAG_WRITE;
339 if (s->local_rtcpport < 0) {
340 s->local_rtcpport = s->local_rtpport + 1;
341 build_udp_url(s, buf, sizeof(buf),
342 hostname, s->localaddr, s->rtcp_port, s->local_rtcpport,
343 sources, block);
344 if (ffurl_open_whitelist(&s->rtcp_hd, buf, rtcpflags,
345 &h->interrupt_callback, NULL,
346 h->protocol_whitelist, h->protocol_blacklist, h) < 0) {
347 s->local_rtpport = s->local_rtcpport = -1;
348 continue;
349 }
350 break;
351 }
352 build_udp_url(s, buf, sizeof(buf),
353 hostname, s->localaddr, s->rtcp_port, s->local_rtcpport,
354 sources, block);
355 if (ffurl_open_whitelist(&s->rtcp_hd, buf, rtcpflags, &h->interrupt_callback,
356 NULL, h->protocol_whitelist, h->protocol_blacklist, h) < 0)
357 goto fail;
358 break;
359 }
360
361 s->fec_hd = NULL;
362 if (fec_protocol) {
363 ff_url_join(buf, sizeof(buf), fec_protocol, NULL, hostname, rtp_port, NULL);
364 if (ffurl_open_whitelist(&s->fec_hd, buf, flags, &h->interrupt_callback,
365 &fec_opts, h->protocol_whitelist, h->protocol_blacklist, h) < 0)
366 goto fail;
367 }
368
369 /* just to ease handle access. XXX: need to suppress direct handle
370 access */
371 s->rtp_fd = ffurl_get_file_handle(s->rtp_hd);
372 s->rtcp_fd = ffurl_get_file_handle(s->rtcp_hd);
373
374 h->max_packet_size = s->rtp_hd->max_packet_size;
375 h->is_streamed = 1;
376
377 av_free(fec_protocol);
378 av_dict_free(&fec_opts);
379
380 return 0;
381
382 fail:
383 ffurl_closep(&s->rtp_hd);
384 ffurl_closep(&s->rtcp_hd);
385 ffurl_closep(&s->fec_hd);
386 av_free(fec_protocol);
387 av_dict_free(&fec_opts);
388 return AVERROR(EIO);
389 }
390
rtp_read(URLContext *h, uint8_t *buf, int size)391 static int rtp_read(URLContext *h, uint8_t *buf, int size)
392 {
393 RTPContext *s = h->priv_data;
394 int len, n, i;
395 struct pollfd p[2] = {{s->rtp_fd, POLLIN, 0}, {s->rtcp_fd, POLLIN, 0}};
396 int poll_delay = h->flags & AVIO_FLAG_NONBLOCK ? 0 : POLLING_TIME;
397 struct sockaddr_storage *addrs[2] = { &s->last_rtp_source, &s->last_rtcp_source };
398 socklen_t *addr_lens[2] = { &s->last_rtp_source_len, &s->last_rtcp_source_len };
399 int runs = h->rw_timeout / 1000 / POLLING_TIME;
400
401 for(;;) {
402 if (ff_check_interrupt(&h->interrupt_callback))
403 return AVERROR_EXIT;
404 n = poll(p, 2, poll_delay);
405 if (n > 0) {
406 /* first try RTCP, then RTP */
407 for (i = 1; i >= 0; i--) {
408 if (!(p[i].revents & POLLIN))
409 continue;
410 *addr_lens[i] = sizeof(*addrs[i]);
411 len = recvfrom(p[i].fd, buf, size, 0,
412 (struct sockaddr *)addrs[i], addr_lens[i]);
413 if (len < 0) {
414 if (ff_neterrno() == AVERROR(EAGAIN) ||
415 ff_neterrno() == AVERROR(EINTR))
416 continue;
417 return AVERROR(EIO);
418 }
419 if (ff_ip_check_source_lists(addrs[i], &s->filters))
420 continue;
421 return len;
422 }
423 } else if (n == 0 && h->rw_timeout > 0 && --runs <= 0) {
424 return AVERROR(ETIMEDOUT);
425 } else if (n < 0) {
426 if (ff_neterrno() == AVERROR(EINTR))
427 continue;
428 return AVERROR(EIO);
429 }
430 if (h->flags & AVIO_FLAG_NONBLOCK)
431 return AVERROR(EAGAIN);
432 }
433 }
434
rtp_write(URLContext *h, const uint8_t *buf, int size)435 static int rtp_write(URLContext *h, const uint8_t *buf, int size)
436 {
437 RTPContext *s = h->priv_data;
438 int ret, ret_fec;
439 URLContext *hd;
440
441 if (size < 2)
442 return AVERROR(EINVAL);
443
444 if ((buf[0] & 0xc0) != (RTP_VERSION << 6))
445 av_log(h, AV_LOG_WARNING, "Data doesn't look like RTP packets, "
446 "make sure the RTP muxer is used\n");
447
448 if (s->write_to_source) {
449 int fd;
450 struct sockaddr_storage *source, temp_source;
451 socklen_t *source_len, temp_len;
452 if (!s->last_rtp_source.ss_family && !s->last_rtcp_source.ss_family) {
453 av_log(h, AV_LOG_ERROR,
454 "Unable to send packet to source, no packets received yet\n");
455 // Intentionally not returning an error here
456 return size;
457 }
458
459 if (RTP_PT_IS_RTCP(buf[1])) {
460 fd = s->rtcp_fd;
461 source = &s->last_rtcp_source;
462 source_len = &s->last_rtcp_source_len;
463 } else {
464 fd = s->rtp_fd;
465 source = &s->last_rtp_source;
466 source_len = &s->last_rtp_source_len;
467 }
468 if (!source->ss_family) {
469 source = &temp_source;
470 source_len = &temp_len;
471 if (RTP_PT_IS_RTCP(buf[1])) {
472 temp_source = s->last_rtp_source;
473 temp_len = s->last_rtp_source_len;
474 set_port(source, get_port(source) + 1);
475 av_log(h, AV_LOG_INFO,
476 "Not received any RTCP packets yet, inferring peer port "
477 "from the RTP port\n");
478 } else {
479 temp_source = s->last_rtcp_source;
480 temp_len = s->last_rtcp_source_len;
481 set_port(source, get_port(source) - 1);
482 av_log(h, AV_LOG_INFO,
483 "Not received any RTP packets yet, inferring peer port "
484 "from the RTCP port\n");
485 }
486 }
487
488 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
489 ret = ff_network_wait_fd(fd, 1);
490 if (ret < 0)
491 return ret;
492 }
493 ret = sendto(fd, buf, size, 0, (struct sockaddr *) source,
494 *source_len);
495
496 return ret < 0 ? ff_neterrno() : ret;
497 }
498
499 if (RTP_PT_IS_RTCP(buf[1])) {
500 /* RTCP payload type */
501 hd = s->rtcp_hd;
502 } else {
503 /* RTP payload type */
504 hd = s->rtp_hd;
505 }
506
507 if ((ret = ffurl_write(hd, buf, size)) < 0) {
508 return ret;
509 }
510
511 if (s->fec_hd && !RTP_PT_IS_RTCP(buf[1])) {
512 if ((ret_fec = ffurl_write(s->fec_hd, buf, size)) < 0) {
513 av_log(h, AV_LOG_ERROR, "Failed to send FEC\n");
514 return ret_fec;
515 }
516 }
517
518 return ret;
519 }
520
rtp_close(URLContext *h)521 static int rtp_close(URLContext *h)
522 {
523 RTPContext *s = h->priv_data;
524
525 ff_ip_reset_filters(&s->filters);
526
527 ffurl_closep(&s->rtp_hd);
528 ffurl_closep(&s->rtcp_hd);
529 ffurl_closep(&s->fec_hd);
530 return 0;
531 }
532
533 /**
534 * Return the local rtp port used by the RTP connection
535 * @param h media file context
536 * @return the local port number
537 */
538
ff_rtp_get_local_rtp_port(URLContext *h)539 int ff_rtp_get_local_rtp_port(URLContext *h)
540 {
541 RTPContext *s = h->priv_data;
542 return ff_udp_get_local_port(s->rtp_hd);
543 }
544
545 /**
546 * Return the local rtcp port used by the RTP connection
547 * @param h media file context
548 * @return the local port number
549 */
550
rtp_get_file_handle(URLContext *h)551 static int rtp_get_file_handle(URLContext *h)
552 {
553 RTPContext *s = h->priv_data;
554 return s->rtp_fd;
555 }
556
rtp_get_multi_file_handle(URLContext *h, int **handles, int *numhandles)557 static int rtp_get_multi_file_handle(URLContext *h, int **handles,
558 int *numhandles)
559 {
560 RTPContext *s = h->priv_data;
561 int *hs = *handles = av_malloc(sizeof(**handles) * 2);
562 if (!hs)
563 return AVERROR(ENOMEM);
564 hs[0] = s->rtp_fd;
565 hs[1] = s->rtcp_fd;
566 *numhandles = 2;
567 return 0;
568 }
569
570 const URLProtocol ff_rtp_protocol = {
571 .name = "rtp",
572 .url_open = rtp_open,
573 .url_read = rtp_read,
574 .url_write = rtp_write,
575 .url_close = rtp_close,
576 .url_get_file_handle = rtp_get_file_handle,
577 .url_get_multi_file_handle = rtp_get_multi_file_handle,
578 .priv_data_size = sizeof(RTPContext),
579 .flags = URL_PROTOCOL_FLAG_NETWORK,
580 .priv_data_class = &rtp_class,
581 };
582