3 * Copyright (c) 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
27 #include "libavutil/parseutils.h"
28 #include "libavutil/avstring.h"
30 #include "avio_internal.h"
38 #include "os_support.h"
44 typedef struct RTPContext {
45 URLContext *rtp_hd, *rtcp_hd;
46 int rtp_fd, rtcp_fd, nb_ssm_include_addrs, nb_ssm_exclude_addrs;
47 struct sockaddr_storage **ssm_include_addrs, **ssm_exclude_addrs;
49 struct sockaddr_storage last_rtp_source, last_rtcp_source;
50 socklen_t last_rtp_source_len, last_rtcp_source_len;
54 * If no filename is given to av_open_input_file because you want to
55 * get the local port first, then you must call this function to set
56 * the remote server address.
58 * @param h media file context
59 * @param uri of the remote server
60 * @return zero if no error.
63 int ff_rtp_set_remote_url(URLContext *h, const char *uri)
65 RTPContext *s = h->priv_data;
73 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
74 path, sizeof(path), uri);
79 if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
80 rtcp_port = strtol(buf, NULL, 10);
84 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
85 ff_udp_set_remote_url(s->rtp_hd, buf);
87 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, rtcp_port, "%s", path);
88 ff_udp_set_remote_url(s->rtcp_hd, buf);
92 static struct addrinfo* rtp_resolve_host(const char *hostname, int port,
93 int type, int family, int flags)
95 struct addrinfo hints = { 0 }, *res = 0;
99 snprintf(service, sizeof(service), "%d", port);
100 hints.ai_socktype = type;
101 hints.ai_family = family;
102 hints.ai_flags = flags;
103 if ((error = getaddrinfo(hostname, service, &hints, &res))) {
105 av_log(NULL, AV_LOG_ERROR, "rtp_resolve_host: %s\n", gai_strerror(error));
111 static int compare_addr(const struct sockaddr_storage *a,
112 const struct sockaddr_storage *b)
114 if (a->ss_family != b->ss_family)
116 if (a->ss_family == AF_INET) {
117 return (((const struct sockaddr_in *)a)->sin_addr.s_addr !=
118 ((const struct sockaddr_in *)b)->sin_addr.s_addr);
121 #if HAVE_STRUCT_SOCKADDR_IN6
122 if (a->ss_family == AF_INET6) {
123 const uint8_t *s6_addr_a = ((const struct sockaddr_in6 *)a)->sin6_addr.s6_addr;
124 const uint8_t *s6_addr_b = ((const struct sockaddr_in6 *)b)->sin6_addr.s6_addr;
125 return memcmp(s6_addr_a, s6_addr_b, 16);
131 static int get_port(const struct sockaddr_storage *ss)
133 if (ss->ss_family == AF_INET)
134 return ntohs(((const struct sockaddr_in *)ss)->sin_port);
135 #if HAVE_STRUCT_SOCKADDR_IN6
136 if (ss->ss_family == AF_INET6)
137 return ntohs(((const struct sockaddr_in6 *)ss)->sin6_port);
142 static void set_port(struct sockaddr_storage *ss, int port)
144 if (ss->ss_family == AF_INET)
145 ((struct sockaddr_in *)ss)->sin_port = htons(port);
146 #if HAVE_STRUCT_SOCKADDR_IN6
147 else if (ss->ss_family == AF_INET6)
148 ((struct sockaddr_in6 *)ss)->sin6_port = htons(port);
152 static int rtp_check_source_lists(RTPContext *s, struct sockaddr_storage *source_addr_ptr)
155 if (s->nb_ssm_exclude_addrs) {
156 for (i = 0; i < s->nb_ssm_exclude_addrs; i++) {
157 if (!compare_addr(source_addr_ptr, s->ssm_exclude_addrs[i]))
161 if (s->nb_ssm_include_addrs) {
162 for (i = 0; i < s->nb_ssm_include_addrs; i++) {
163 if (!compare_addr(source_addr_ptr, s->ssm_include_addrs[i]))
172 * add option to url of the form:
173 * "http://host:port/path?option1=val1&option2=val2...
176 static av_printf_format(3, 4) void url_add_option(char *buf, int buf_size, const char *fmt, ...)
182 if (strchr(buf, '?'))
183 av_strlcat(buf, "&", buf_size);
185 av_strlcat(buf, "?", buf_size);
186 vsnprintf(buf1, sizeof(buf1), fmt, ap);
187 av_strlcat(buf, buf1, buf_size);
191 static void build_udp_url(char *buf, int buf_size,
192 const char *hostname, int port,
193 int local_port, int ttl,
194 int max_packet_size, int connect,
195 const char *include_sources,
196 const char *exclude_sources)
198 ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
200 url_add_option(buf, buf_size, "localport=%d", local_port);
202 url_add_option(buf, buf_size, "ttl=%d", ttl);
203 if (max_packet_size >=0)
204 url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size);
206 url_add_option(buf, buf_size, "connect=1");
207 url_add_option(buf, buf_size, "fifo_size=0");
208 if (include_sources && include_sources[0])
209 url_add_option(buf, buf_size, "sources=%s", include_sources);
210 if (exclude_sources && exclude_sources[0])
211 url_add_option(buf, buf_size, "block=%s", exclude_sources);
214 static void rtp_parse_addr_list(URLContext *h, char *buf,
215 struct sockaddr_storage ***address_list_ptr,
216 int *address_list_size_ptr)
218 struct addrinfo *ai = NULL;
219 struct sockaddr_storage *source_addr;
220 char tmp = '\0', *p = buf, *next;
222 /* Resolve all of the IPs */
225 next = strchr(p, ',');
232 ai = rtp_resolve_host(p, 0, SOCK_DGRAM, AF_UNSPEC, 0);
234 source_addr = av_mallocz(sizeof(struct sockaddr_storage));
240 memcpy(source_addr, ai->ai_addr, ai->ai_addrlen);
242 dynarray_add(address_list_ptr, address_list_size_ptr, source_addr);
244 av_log(h, AV_LOG_WARNING, "Unable to resolve %s\n", p);
257 * url syntax: rtp://host:port[?option=val...]
258 * option: 'ttl=n' : set the ttl value (for multicast only)
259 * 'rtcpport=n' : set the remote rtcp port to n
260 * 'localrtpport=n' : set the local rtp port to n
261 * 'localrtcpport=n' : set the local rtcp port to n
262 * 'pkt_size=n' : set max packet size
263 * 'connect=0/1' : do a connect() on the UDP socket
264 * 'sources=ip[,ip]' : list allowed source IP addresses
265 * 'block=ip[,ip]' : list disallowed source IP addresses
266 * 'write_to_source=0/1' : send packets to the source address of the latest received packet
268 * 'localport=n' : set the local port to n
270 * if rtcpport isn't set the rtcp port will be the rtp port + 1
271 * if local rtp port isn't set any available port will be used for the local
273 * if the local rtcp port is not set it will be the local rtp port + 1
276 static int rtp_open(URLContext *h, const char *uri, int flags)
278 RTPContext *s = h->priv_data;
279 int rtp_port, rtcp_port,
281 local_rtp_port, local_rtcp_port, max_packet_size;
282 char hostname[256], include_sources[1024] = "", exclude_sources[1024] = "";
286 int i, max_retry_count = 3;
288 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
289 path, sizeof(path), uri);
290 /* extract parameters */
292 rtcp_port = rtp_port+1;
294 local_rtcp_port = -1;
295 max_packet_size = -1;
298 p = strchr(uri, '?');
300 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
301 ttl = strtol(buf, NULL, 10);
303 if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
304 rtcp_port = strtol(buf, NULL, 10);
306 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
307 local_rtp_port = strtol(buf, NULL, 10);
309 if (av_find_info_tag(buf, sizeof(buf), "localrtpport", p)) {
310 local_rtp_port = strtol(buf, NULL, 10);
312 if (av_find_info_tag(buf, sizeof(buf), "localrtcpport", p)) {
313 local_rtcp_port = strtol(buf, NULL, 10);
315 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
316 max_packet_size = strtol(buf, NULL, 10);
318 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
319 connect = strtol(buf, NULL, 10);
321 if (av_find_info_tag(buf, sizeof(buf), "write_to_source", p)) {
322 s->write_to_source = strtol(buf, NULL, 10);
324 if (av_find_info_tag(buf, sizeof(buf), "sources", p)) {
325 av_strlcpy(include_sources, buf, sizeof(include_sources));
326 rtp_parse_addr_list(h, buf, &s->ssm_include_addrs, &s->nb_ssm_include_addrs);
328 if (av_find_info_tag(buf, sizeof(buf), "block", p)) {
329 av_strlcpy(exclude_sources, buf, sizeof(exclude_sources));
330 rtp_parse_addr_list(h, buf, &s->ssm_exclude_addrs, &s->nb_ssm_exclude_addrs);
334 for (i = 0;i < max_retry_count;i++) {
335 build_udp_url(buf, sizeof(buf),
336 hostname, rtp_port, local_rtp_port, ttl, max_packet_size,
337 connect, include_sources, exclude_sources);
338 if (ffurl_open(&s->rtp_hd, buf, flags, &h->interrupt_callback, NULL) < 0)
340 local_rtp_port = ff_udp_get_local_port(s->rtp_hd);
341 if(local_rtp_port == 65535) {
345 if (local_rtcp_port<0) {
346 local_rtcp_port = local_rtp_port + 1;
347 build_udp_url(buf, sizeof(buf),
348 hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size,
349 connect, include_sources, exclude_sources);
350 if (ffurl_open(&s->rtcp_hd, buf, flags, &h->interrupt_callback, NULL) < 0) {
351 local_rtp_port = local_rtcp_port = -1;
356 build_udp_url(buf, sizeof(buf),
357 hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size,
358 connect, include_sources, exclude_sources);
359 if (ffurl_open(&s->rtcp_hd, buf, flags, &h->interrupt_callback, NULL) < 0)
364 /* just to ease handle access. XXX: need to suppress direct handle
366 s->rtp_fd = ffurl_get_file_handle(s->rtp_hd);
367 s->rtcp_fd = ffurl_get_file_handle(s->rtcp_hd);
369 h->max_packet_size = s->rtp_hd->max_packet_size;
375 ffurl_close(s->rtp_hd);
377 ffurl_close(s->rtcp_hd);
381 static int rtp_read(URLContext *h, uint8_t *buf, int size)
383 RTPContext *s = h->priv_data;
385 struct pollfd p[2] = {{s->rtp_fd, POLLIN, 0}, {s->rtcp_fd, POLLIN, 0}};
386 int poll_delay = h->flags & AVIO_FLAG_NONBLOCK ? 0 : 100;
387 struct sockaddr_storage *addrs[2] = { &s->last_rtp_source, &s->last_rtcp_source };
388 socklen_t *addr_lens[2] = { &s->last_rtp_source_len, &s->last_rtcp_source_len };
391 if (ff_check_interrupt(&h->interrupt_callback))
393 n = poll(p, 2, poll_delay);
395 /* first try RTCP, then RTP */
396 for (i = 1; i >= 0; i--) {
397 if (!(p[i].revents & POLLIN))
399 *addr_lens[i] = sizeof(*addrs[i]);
400 len = recvfrom(p[i].fd, buf, size, 0,
401 (struct sockaddr *)addrs[i], addr_lens[i]);
403 if (ff_neterrno() == AVERROR(EAGAIN) ||
404 ff_neterrno() == AVERROR(EINTR))
408 if (rtp_check_source_lists(s, addrs[i]))
413 if (ff_neterrno() == AVERROR(EINTR))
417 if (h->flags & AVIO_FLAG_NONBLOCK)
418 return AVERROR(EAGAIN);
423 static int rtp_write(URLContext *h, const uint8_t *buf, int size)
425 RTPContext *s = h->priv_data;
430 return AVERROR(EINVAL);
432 if (s->write_to_source) {
434 struct sockaddr_storage *source, temp_source;
435 socklen_t *source_len, temp_len;
436 if (!s->last_rtp_source.ss_family && !s->last_rtcp_source.ss_family) {
437 av_log(h, AV_LOG_ERROR,
438 "Unable to send packet to source, no packets received yet\n");
439 // Intentionally not returning an error here
443 if (RTP_PT_IS_RTCP(buf[1])) {
445 source = &s->last_rtcp_source;
446 source_len = &s->last_rtcp_source_len;
449 source = &s->last_rtp_source;
450 source_len = &s->last_rtp_source_len;
452 if (!source->ss_family) {
453 source = &temp_source;
454 source_len = &temp_len;
455 if (RTP_PT_IS_RTCP(buf[1])) {
456 temp_source = s->last_rtp_source;
457 temp_len = s->last_rtp_source_len;
458 set_port(source, get_port(source) + 1);
459 av_log(h, AV_LOG_INFO,
460 "Not received any RTCP packets yet, inferring peer port "
461 "from the RTP port\n");
463 temp_source = s->last_rtcp_source;
464 temp_len = s->last_rtcp_source_len;
465 set_port(source, get_port(source) - 1);
466 av_log(h, AV_LOG_INFO,
467 "Not received any RTP packets yet, inferring peer port "
468 "from the RTCP port\n");
472 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
473 ret = ff_network_wait_fd(fd, 1);
477 ret = sendto(fd, buf, size, 0, (struct sockaddr *) source,
480 return ret < 0 ? ff_neterrno() : ret;
483 if (RTP_PT_IS_RTCP(buf[1])) {
484 /* RTCP payload type */
487 /* RTP payload type */
491 ret = ffurl_write(hd, buf, size);
495 static int rtp_close(URLContext *h)
497 RTPContext *s = h->priv_data;
500 for (i = 0; i < s->nb_ssm_include_addrs; i++)
501 av_free(s->ssm_include_addrs[i]);
502 av_freep(&s->ssm_include_addrs);
503 for (i = 0; i < s->nb_ssm_exclude_addrs; i++)
504 av_free(s->ssm_exclude_addrs[i]);
505 av_freep(&s->ssm_exclude_addrs);
507 ffurl_close(s->rtp_hd);
508 ffurl_close(s->rtcp_hd);
513 * Return the local rtp port used by the RTP connection
514 * @param h media file context
515 * @return the local port number
518 int ff_rtp_get_local_rtp_port(URLContext *h)
520 RTPContext *s = h->priv_data;
521 return ff_udp_get_local_port(s->rtp_hd);
525 * Return the local rtcp port used by the RTP connection
526 * @param h media file context
527 * @return the local port number
530 int ff_rtp_get_local_rtcp_port(URLContext *h)
532 RTPContext *s = h->priv_data;
533 return ff_udp_get_local_port(s->rtcp_hd);
536 static int rtp_get_file_handle(URLContext *h)
538 RTPContext *s = h->priv_data;
542 static int rtp_get_multi_file_handle(URLContext *h, int **handles,
545 RTPContext *s = h->priv_data;
546 int *hs = *handles = av_malloc(sizeof(**handles) * 2);
548 return AVERROR(ENOMEM);
555 URLProtocol ff_rtp_protocol = {
557 .url_open = rtp_open,
558 .url_read = rtp_read,
559 .url_write = rtp_write,
560 .url_close = rtp_close,
561 .url_get_file_handle = rtp_get_file_handle,
562 .url_get_multi_file_handle = rtp_get_multi_file_handle,
563 .priv_data_size = sizeof(RTPContext),
564 .flags = URL_PROTOCOL_FLAG_NETWORK,