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2ba45a60 DM |
1 | /* |
2 | * UDP prototype streaming system | |
3 | * Copyright (c) 2000, 2001, 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 | * UDP protocol | |
25 | */ | |
26 | ||
27 | #define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */ | |
28 | ||
29 | #include "avformat.h" | |
30 | #include "avio_internal.h" | |
31 | #include "libavutil/parseutils.h" | |
32 | #include "libavutil/fifo.h" | |
33 | #include "libavutil/intreadwrite.h" | |
34 | #include "libavutil/avstring.h" | |
35 | #include "libavutil/opt.h" | |
36 | #include "libavutil/log.h" | |
37 | #include "libavutil/time.h" | |
38 | #include "internal.h" | |
39 | #include "network.h" | |
40 | #include "os_support.h" | |
41 | #include "url.h" | |
42 | ||
43 | #if HAVE_PTHREAD_CANCEL | |
44 | #include <pthread.h> | |
45 | #endif | |
46 | ||
47 | #ifndef HAVE_PTHREAD_CANCEL | |
48 | #define HAVE_PTHREAD_CANCEL 0 | |
49 | #endif | |
50 | ||
51 | #ifndef IPV6_ADD_MEMBERSHIP | |
52 | #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP | |
53 | #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP | |
54 | #endif | |
55 | ||
56 | #define UDP_TX_BUF_SIZE 32768 | |
57 | #define UDP_MAX_PKT_SIZE 65536 | |
58 | ||
59 | typedef struct { | |
60 | const AVClass *class; | |
61 | int udp_fd; | |
62 | int ttl; | |
63 | int buffer_size; | |
64 | int is_multicast; | |
65 | int is_broadcast; | |
66 | int local_port; | |
67 | int reuse_socket; | |
68 | int overrun_nonfatal; | |
69 | struct sockaddr_storage dest_addr; | |
70 | int dest_addr_len; | |
71 | int is_connected; | |
72 | ||
73 | /* Circular Buffer variables for use in UDP receive code */ | |
74 | int circular_buffer_size; | |
75 | AVFifoBuffer *fifo; | |
76 | int circular_buffer_error; | |
77 | #if HAVE_PTHREAD_CANCEL | |
78 | pthread_t circular_buffer_thread; | |
79 | pthread_mutex_t mutex; | |
80 | pthread_cond_t cond; | |
81 | int thread_started; | |
82 | #endif | |
83 | uint8_t tmp[UDP_MAX_PKT_SIZE+4]; | |
84 | int remaining_in_dg; | |
85 | char *local_addr; | |
86 | int packet_size; | |
87 | int timeout; | |
88 | struct sockaddr_storage local_addr_storage; | |
89 | } UDPContext; | |
90 | ||
91 | #define OFFSET(x) offsetof(UDPContext, x) | |
92 | #define D AV_OPT_FLAG_DECODING_PARAM | |
93 | #define E AV_OPT_FLAG_ENCODING_PARAM | |
94 | static const AVOption options[] = { | |
95 | {"buffer_size", "set packet buffer size in bytes", OFFSET(buffer_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E }, | |
96 | {"localport", "set local port to bind to", OFFSET(local_port), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E }, | |
97 | {"localaddr", "choose local IP address", OFFSET(local_addr), AV_OPT_TYPE_STRING, {.str = ""}, 0, 0, D|E }, | |
98 | {"pkt_size", "set size of UDP packets", OFFSET(packet_size), AV_OPT_TYPE_INT, {.i64 = 1472}, 0, INT_MAX, D|E }, | |
99 | {"reuse", "explicitly allow or disallow reusing UDP sockets", OFFSET(reuse_socket), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E }, | |
100 | {"broadcast", "explicitly allow or disallow broadcast destination", OFFSET(is_broadcast), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E }, | |
101 | {"ttl", "set the time to live value (for multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, {.i64 = 16}, 0, INT_MAX, E }, | |
102 | {"connect", "set if connect() should be called on socket", OFFSET(is_connected), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E }, | |
103 | /* TODO 'sources', 'block' option */ | |
104 | {"fifo_size", "set the UDP receiving circular buffer size, expressed as a number of packets with size of 188 bytes", OFFSET(circular_buffer_size), AV_OPT_TYPE_INT, {.i64 = 7*4096}, 0, INT_MAX, D }, | |
105 | {"overrun_nonfatal", "survive in case of UDP receiving circular buffer overrun", OFFSET(overrun_nonfatal), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D }, | |
106 | {"timeout", "set raise error timeout (only in read mode)", OFFSET(timeout), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D }, | |
107 | {NULL} | |
108 | }; | |
109 | ||
110 | static const AVClass udp_context_class = { | |
111 | .class_name = "udp", | |
112 | .item_name = av_default_item_name, | |
113 | .option = options, | |
114 | .version = LIBAVUTIL_VERSION_INT, | |
115 | }; | |
116 | ||
117 | static void log_net_error(void *ctx, int level, const char* prefix) | |
118 | { | |
119 | char errbuf[100]; | |
120 | av_strerror(ff_neterrno(), errbuf, sizeof(errbuf)); | |
121 | av_log(ctx, level, "%s: %s\n", prefix, errbuf); | |
122 | } | |
123 | ||
124 | static int udp_set_multicast_ttl(int sockfd, int mcastTTL, | |
125 | struct sockaddr *addr) | |
126 | { | |
127 | #ifdef IP_MULTICAST_TTL | |
128 | if (addr->sa_family == AF_INET) { | |
129 | if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) { | |
130 | log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL)"); | |
131 | return -1; | |
132 | } | |
133 | } | |
134 | #endif | |
135 | #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS) | |
136 | if (addr->sa_family == AF_INET6) { | |
137 | if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) { | |
138 | log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS)"); | |
139 | return -1; | |
140 | } | |
141 | } | |
142 | #endif | |
143 | return 0; | |
144 | } | |
145 | ||
146 | static int udp_join_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr) | |
147 | { | |
148 | #ifdef IP_ADD_MEMBERSHIP | |
149 | if (addr->sa_family == AF_INET) { | |
150 | struct ip_mreq mreq; | |
151 | ||
152 | mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr; | |
153 | if (local_addr) | |
154 | mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr; | |
155 | else | |
156 | mreq.imr_interface.s_addr= INADDR_ANY; | |
157 | if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) { | |
158 | log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)"); | |
159 | return -1; | |
160 | } | |
161 | } | |
162 | #endif | |
163 | #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6) | |
164 | if (addr->sa_family == AF_INET6) { | |
165 | struct ipv6_mreq mreq6; | |
166 | ||
167 | memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr)); | |
168 | mreq6.ipv6mr_interface= 0; | |
169 | if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) { | |
170 | log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)"); | |
171 | return -1; | |
172 | } | |
173 | } | |
174 | #endif | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr) | |
179 | { | |
180 | #ifdef IP_DROP_MEMBERSHIP | |
181 | if (addr->sa_family == AF_INET) { | |
182 | struct ip_mreq mreq; | |
183 | ||
184 | mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr; | |
185 | if (local_addr) | |
186 | mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr; | |
187 | else | |
188 | mreq.imr_interface.s_addr= INADDR_ANY; | |
189 | if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) { | |
190 | log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)"); | |
191 | return -1; | |
192 | } | |
193 | } | |
194 | #endif | |
195 | #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6) | |
196 | if (addr->sa_family == AF_INET6) { | |
197 | struct ipv6_mreq mreq6; | |
198 | ||
199 | memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr)); | |
200 | mreq6.ipv6mr_interface= 0; | |
201 | if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) { | |
202 | log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)"); | |
203 | return -1; | |
204 | } | |
205 | } | |
206 | #endif | |
207 | return 0; | |
208 | } | |
209 | ||
210 | static struct addrinfo* udp_resolve_host(const char *hostname, int port, | |
211 | int type, int family, int flags) | |
212 | { | |
213 | struct addrinfo hints = { 0 }, *res = 0; | |
214 | int error; | |
215 | char sport[16]; | |
216 | const char *node = 0, *service = "0"; | |
217 | ||
218 | if (port > 0) { | |
219 | snprintf(sport, sizeof(sport), "%d", port); | |
220 | service = sport; | |
221 | } | |
222 | if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) { | |
223 | node = hostname; | |
224 | } | |
225 | hints.ai_socktype = type; | |
226 | hints.ai_family = family; | |
227 | hints.ai_flags = flags; | |
228 | if ((error = getaddrinfo(node, service, &hints, &res))) { | |
229 | res = NULL; | |
230 | av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error)); | |
231 | } | |
232 | ||
233 | return res; | |
234 | } | |
235 | ||
236 | static int udp_set_multicast_sources(int sockfd, struct sockaddr *addr, | |
237 | int addr_len, char **sources, | |
238 | int nb_sources, int include) | |
239 | { | |
240 | #if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE) && !defined(_WIN32) | |
241 | /* These ones are available in the microsoft SDK, but don't seem to work | |
242 | * as on linux, so just prefer the v4-only approach there for now. */ | |
243 | int i; | |
244 | for (i = 0; i < nb_sources; i++) { | |
245 | struct group_source_req mreqs; | |
246 | int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6; | |
247 | struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0, | |
248 | SOCK_DGRAM, AF_UNSPEC, | |
249 | 0); | |
250 | if (!sourceaddr) | |
251 | return AVERROR(ENOENT); | |
252 | ||
253 | mreqs.gsr_interface = 0; | |
254 | memcpy(&mreqs.gsr_group, addr, addr_len); | |
255 | memcpy(&mreqs.gsr_source, sourceaddr->ai_addr, sourceaddr->ai_addrlen); | |
256 | freeaddrinfo(sourceaddr); | |
257 | ||
258 | if (setsockopt(sockfd, level, | |
259 | include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE, | |
260 | (const void *)&mreqs, sizeof(mreqs)) < 0) { | |
261 | if (include) | |
262 | log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)"); | |
263 | else | |
264 | log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)"); | |
265 | return ff_neterrno(); | |
266 | } | |
267 | } | |
268 | #elif HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE) | |
269 | int i; | |
270 | if (addr->sa_family != AF_INET) { | |
271 | av_log(NULL, AV_LOG_ERROR, | |
272 | "Setting multicast sources only supported for IPv4\n"); | |
273 | return AVERROR(EINVAL); | |
274 | } | |
275 | for (i = 0; i < nb_sources; i++) { | |
276 | struct ip_mreq_source mreqs; | |
277 | struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0, | |
278 | SOCK_DGRAM, AF_UNSPEC, | |
279 | 0); | |
280 | if (!sourceaddr) | |
281 | return AVERROR(ENOENT); | |
282 | if (sourceaddr->ai_addr->sa_family != AF_INET) { | |
283 | freeaddrinfo(sourceaddr); | |
284 | av_log(NULL, AV_LOG_ERROR, "%s is of incorrect protocol family\n", | |
285 | sources[i]); | |
286 | return AVERROR(EINVAL); | |
287 | } | |
288 | ||
289 | mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr; | |
290 | mreqs.imr_interface.s_addr = INADDR_ANY; | |
291 | mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)sourceaddr->ai_addr)->sin_addr.s_addr; | |
292 | freeaddrinfo(sourceaddr); | |
293 | ||
294 | if (setsockopt(sockfd, IPPROTO_IP, | |
295 | include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE, | |
296 | (const void *)&mreqs, sizeof(mreqs)) < 0) { | |
297 | if (include) | |
298 | log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)"); | |
299 | else | |
300 | log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)"); | |
301 | return ff_neterrno(); | |
302 | } | |
303 | } | |
304 | #else | |
305 | return AVERROR(ENOSYS); | |
306 | #endif | |
307 | return 0; | |
308 | } | |
309 | static int udp_set_url(struct sockaddr_storage *addr, | |
310 | const char *hostname, int port) | |
311 | { | |
312 | struct addrinfo *res0; | |
313 | int addr_len; | |
314 | ||
315 | res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0); | |
316 | if (!res0) return AVERROR(EIO); | |
317 | memcpy(addr, res0->ai_addr, res0->ai_addrlen); | |
318 | addr_len = res0->ai_addrlen; | |
319 | freeaddrinfo(res0); | |
320 | ||
321 | return addr_len; | |
322 | } | |
323 | ||
324 | static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, | |
325 | socklen_t *addr_len, const char *localaddr) | |
326 | { | |
327 | int udp_fd = -1; | |
328 | struct addrinfo *res0, *res; | |
329 | int family = AF_UNSPEC; | |
330 | ||
331 | if (((struct sockaddr *) &s->dest_addr)->sa_family) | |
332 | family = ((struct sockaddr *) &s->dest_addr)->sa_family; | |
333 | res0 = udp_resolve_host(localaddr[0] ? localaddr : NULL, s->local_port, | |
334 | SOCK_DGRAM, family, AI_PASSIVE); | |
335 | if (!res0) | |
336 | goto fail; | |
337 | for (res = res0; res; res=res->ai_next) { | |
338 | udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, 0); | |
339 | if (udp_fd != -1) break; | |
340 | log_net_error(NULL, AV_LOG_ERROR, "socket"); | |
341 | } | |
342 | ||
343 | if (udp_fd < 0) | |
344 | goto fail; | |
345 | ||
346 | memcpy(addr, res->ai_addr, res->ai_addrlen); | |
347 | *addr_len = res->ai_addrlen; | |
348 | ||
349 | freeaddrinfo(res0); | |
350 | ||
351 | return udp_fd; | |
352 | ||
353 | fail: | |
354 | if (udp_fd >= 0) | |
355 | closesocket(udp_fd); | |
356 | if(res0) | |
357 | freeaddrinfo(res0); | |
358 | return -1; | |
359 | } | |
360 | ||
361 | static int udp_port(struct sockaddr_storage *addr, int addr_len) | |
362 | { | |
363 | char sbuf[sizeof(int)*3+1]; | |
364 | int error; | |
365 | ||
366 | if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) { | |
367 | av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error)); | |
368 | return -1; | |
369 | } | |
370 | ||
371 | return strtol(sbuf, NULL, 10); | |
372 | } | |
373 | ||
374 | ||
375 | /** | |
376 | * If no filename is given to av_open_input_file because you want to | |
377 | * get the local port first, then you must call this function to set | |
378 | * the remote server address. | |
379 | * | |
380 | * url syntax: udp://host:port[?option=val...] | |
381 | * option: 'ttl=n' : set the ttl value (for multicast only) | |
382 | * 'localport=n' : set the local port | |
383 | * 'pkt_size=n' : set max packet size | |
384 | * 'reuse=1' : enable reusing the socket | |
385 | * 'overrun_nonfatal=1': survive in case of circular buffer overrun | |
386 | * | |
387 | * @param h media file context | |
388 | * @param uri of the remote server | |
389 | * @return zero if no error. | |
390 | */ | |
391 | int ff_udp_set_remote_url(URLContext *h, const char *uri) | |
392 | { | |
393 | UDPContext *s = h->priv_data; | |
394 | char hostname[256], buf[10]; | |
395 | int port; | |
396 | const char *p; | |
397 | ||
398 | av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri); | |
399 | ||
400 | /* set the destination address */ | |
401 | s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port); | |
402 | if (s->dest_addr_len < 0) { | |
403 | return AVERROR(EIO); | |
404 | } | |
405 | s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr); | |
406 | p = strchr(uri, '?'); | |
407 | if (p) { | |
408 | if (av_find_info_tag(buf, sizeof(buf), "connect", p)) { | |
409 | int was_connected = s->is_connected; | |
410 | s->is_connected = strtol(buf, NULL, 10); | |
411 | if (s->is_connected && !was_connected) { | |
412 | if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr, | |
413 | s->dest_addr_len)) { | |
414 | s->is_connected = 0; | |
415 | log_net_error(h, AV_LOG_ERROR, "connect"); | |
416 | return AVERROR(EIO); | |
417 | } | |
418 | } | |
419 | } | |
420 | } | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
425 | /** | |
426 | * Return the local port used by the UDP connection | |
427 | * @param h media file context | |
428 | * @return the local port number | |
429 | */ | |
430 | int ff_udp_get_local_port(URLContext *h) | |
431 | { | |
432 | UDPContext *s = h->priv_data; | |
433 | return s->local_port; | |
434 | } | |
435 | ||
436 | /** | |
437 | * Return the udp file handle for select() usage to wait for several RTP | |
438 | * streams at the same time. | |
439 | * @param h media file context | |
440 | */ | |
441 | static int udp_get_file_handle(URLContext *h) | |
442 | { | |
443 | UDPContext *s = h->priv_data; | |
444 | return s->udp_fd; | |
445 | } | |
446 | ||
447 | #if HAVE_PTHREAD_CANCEL | |
448 | static void *circular_buffer_task( void *_URLContext) | |
449 | { | |
450 | URLContext *h = _URLContext; | |
451 | UDPContext *s = h->priv_data; | |
452 | int old_cancelstate; | |
453 | ||
454 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate); | |
455 | pthread_mutex_lock(&s->mutex); | |
456 | if (ff_socket_nonblock(s->udp_fd, 0) < 0) { | |
457 | av_log(h, AV_LOG_ERROR, "Failed to set blocking mode"); | |
458 | s->circular_buffer_error = AVERROR(EIO); | |
459 | goto end; | |
460 | } | |
461 | while(1) { | |
462 | int len; | |
463 | ||
464 | pthread_mutex_unlock(&s->mutex); | |
465 | /* Blocking operations are always cancellation points; | |
466 | see "General Information" / "Thread Cancelation Overview" | |
467 | in Single Unix. */ | |
468 | pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancelstate); | |
469 | len = recv(s->udp_fd, s->tmp+4, sizeof(s->tmp)-4, 0); | |
470 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate); | |
471 | pthread_mutex_lock(&s->mutex); | |
472 | if (len < 0) { | |
473 | if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) { | |
474 | s->circular_buffer_error = ff_neterrno(); | |
475 | goto end; | |
476 | } | |
477 | continue; | |
478 | } | |
479 | AV_WL32(s->tmp, len); | |
480 | ||
481 | if(av_fifo_space(s->fifo) < len + 4) { | |
482 | /* No Space left */ | |
483 | if (s->overrun_nonfatal) { | |
484 | av_log(h, AV_LOG_WARNING, "Circular buffer overrun. " | |
485 | "Surviving due to overrun_nonfatal option\n"); | |
486 | continue; | |
487 | } else { | |
488 | av_log(h, AV_LOG_ERROR, "Circular buffer overrun. " | |
489 | "To avoid, increase fifo_size URL option. " | |
490 | "To survive in such case, use overrun_nonfatal option\n"); | |
491 | s->circular_buffer_error = AVERROR(EIO); | |
492 | goto end; | |
493 | } | |
494 | } | |
495 | av_fifo_generic_write(s->fifo, s->tmp, len+4, NULL); | |
496 | pthread_cond_signal(&s->cond); | |
497 | } | |
498 | ||
499 | end: | |
500 | pthread_cond_signal(&s->cond); | |
501 | pthread_mutex_unlock(&s->mutex); | |
502 | return NULL; | |
503 | } | |
504 | #endif | |
505 | ||
506 | static int parse_source_list(char *buf, char **sources, int *num_sources, | |
507 | int max_sources) | |
508 | { | |
509 | char *source_start; | |
510 | ||
511 | source_start = buf; | |
512 | while (1) { | |
513 | char *next = strchr(source_start, ','); | |
514 | if (next) | |
515 | *next = '\0'; | |
516 | sources[*num_sources] = av_strdup(source_start); | |
517 | if (!sources[*num_sources]) | |
518 | return AVERROR(ENOMEM); | |
519 | source_start = next + 1; | |
520 | (*num_sources)++; | |
521 | if (*num_sources >= max_sources || !next) | |
522 | break; | |
523 | } | |
524 | return 0; | |
525 | } | |
526 | ||
527 | /* put it in UDP context */ | |
528 | /* return non zero if error */ | |
529 | static int udp_open(URLContext *h, const char *uri, int flags) | |
530 | { | |
531 | char hostname[1024], localaddr[1024] = ""; | |
532 | int port, udp_fd = -1, tmp, bind_ret = -1; | |
533 | UDPContext *s = h->priv_data; | |
534 | int is_output; | |
535 | const char *p; | |
536 | char buf[256]; | |
537 | struct sockaddr_storage my_addr; | |
538 | socklen_t len; | |
539 | int reuse_specified = 0; | |
540 | int i, num_include_sources = 0, num_exclude_sources = 0; | |
541 | char *include_sources[32], *exclude_sources[32]; | |
542 | ||
543 | h->is_streamed = 1; | |
544 | ||
545 | is_output = !(flags & AVIO_FLAG_READ); | |
546 | if (!s->buffer_size) /* if not set explicitly */ | |
547 | s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE; | |
548 | ||
549 | p = strchr(uri, '?'); | |
550 | if (p) { | |
551 | if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) { | |
552 | char *endptr = NULL; | |
553 | s->reuse_socket = strtol(buf, &endptr, 10); | |
554 | /* assume if no digits were found it is a request to enable it */ | |
555 | if (buf == endptr) | |
556 | s->reuse_socket = 1; | |
557 | reuse_specified = 1; | |
558 | } | |
559 | if (av_find_info_tag(buf, sizeof(buf), "overrun_nonfatal", p)) { | |
560 | char *endptr = NULL; | |
561 | s->overrun_nonfatal = strtol(buf, &endptr, 10); | |
562 | /* assume if no digits were found it is a request to enable it */ | |
563 | if (buf == endptr) | |
564 | s->overrun_nonfatal = 1; | |
565 | if (!HAVE_PTHREAD_CANCEL) | |
566 | av_log(h, AV_LOG_WARNING, | |
567 | "'overrun_nonfatal' option was set but it is not supported " | |
568 | "on this build (pthread support is required)\n"); | |
569 | } | |
570 | if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) { | |
571 | s->ttl = strtol(buf, NULL, 10); | |
572 | } | |
573 | if (av_find_info_tag(buf, sizeof(buf), "localport", p)) { | |
574 | s->local_port = strtol(buf, NULL, 10); | |
575 | } | |
576 | if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) { | |
577 | s->packet_size = strtol(buf, NULL, 10); | |
578 | } | |
579 | if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) { | |
580 | s->buffer_size = strtol(buf, NULL, 10); | |
581 | } | |
582 | if (av_find_info_tag(buf, sizeof(buf), "connect", p)) { | |
583 | s->is_connected = strtol(buf, NULL, 10); | |
584 | } | |
585 | if (av_find_info_tag(buf, sizeof(buf), "fifo_size", p)) { | |
586 | s->circular_buffer_size = strtol(buf, NULL, 10); | |
587 | if (!HAVE_PTHREAD_CANCEL) | |
588 | av_log(h, AV_LOG_WARNING, | |
589 | "'circular_buffer_size' option was set but it is not supported " | |
590 | "on this build (pthread support is required)\n"); | |
591 | } | |
592 | if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) { | |
593 | av_strlcpy(localaddr, buf, sizeof(localaddr)); | |
594 | } | |
595 | if (av_find_info_tag(buf, sizeof(buf), "sources", p)) { | |
596 | if (parse_source_list(buf, include_sources, &num_include_sources, | |
597 | FF_ARRAY_ELEMS(include_sources))) | |
598 | goto fail; | |
599 | } | |
600 | if (av_find_info_tag(buf, sizeof(buf), "block", p)) { | |
601 | if (parse_source_list(buf, exclude_sources, &num_exclude_sources, | |
602 | FF_ARRAY_ELEMS(exclude_sources))) | |
603 | goto fail; | |
604 | } | |
605 | if (!is_output && av_find_info_tag(buf, sizeof(buf), "timeout", p)) | |
606 | s->timeout = strtol(buf, NULL, 10); | |
607 | if (is_output && av_find_info_tag(buf, sizeof(buf), "broadcast", p)) | |
608 | s->is_broadcast = strtol(buf, NULL, 10); | |
609 | } | |
610 | /* handling needed to support options picking from both AVOption and URL */ | |
611 | s->circular_buffer_size *= 188; | |
612 | if (flags & AVIO_FLAG_WRITE) { | |
613 | h->max_packet_size = s->packet_size; | |
614 | } else { | |
615 | h->max_packet_size = UDP_MAX_PKT_SIZE; | |
616 | } | |
617 | h->rw_timeout = s->timeout; | |
618 | ||
619 | /* fill the dest addr */ | |
620 | av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri); | |
621 | ||
622 | /* XXX: fix av_url_split */ | |
623 | if (hostname[0] == '\0' || hostname[0] == '?') { | |
624 | /* only accepts null hostname if input */ | |
625 | if (!(flags & AVIO_FLAG_READ)) | |
626 | goto fail; | |
627 | } else { | |
628 | if (ff_udp_set_remote_url(h, uri) < 0) | |
629 | goto fail; | |
630 | } | |
631 | ||
632 | if ((s->is_multicast || !s->local_port) && (h->flags & AVIO_FLAG_READ)) | |
633 | s->local_port = port; | |
634 | udp_fd = udp_socket_create(s, &my_addr, &len, localaddr[0] ? localaddr : s->local_addr); | |
635 | if (udp_fd < 0) | |
636 | goto fail; | |
637 | ||
638 | s->local_addr_storage=my_addr; //store for future multicast join | |
639 | ||
640 | /* Follow the requested reuse option, unless it's multicast in which | |
641 | * case enable reuse unless explicitly disabled. | |
642 | */ | |
643 | if (s->reuse_socket || (s->is_multicast && !reuse_specified)) { | |
644 | s->reuse_socket = 1; | |
645 | if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0) | |
646 | goto fail; | |
647 | } | |
648 | ||
649 | if (s->is_broadcast) { | |
650 | #ifdef SO_BROADCAST | |
651 | if (setsockopt (udp_fd, SOL_SOCKET, SO_BROADCAST, &(s->is_broadcast), sizeof(s->is_broadcast)) != 0) | |
652 | #endif | |
653 | goto fail; | |
654 | } | |
655 | ||
656 | /* If multicast, try binding the multicast address first, to avoid | |
657 | * receiving UDP packets from other sources aimed at the same UDP | |
658 | * port. This fails on windows. This makes sending to the same address | |
659 | * using sendto() fail, so only do it if we're opened in read-only mode. */ | |
660 | if (s->is_multicast && !(h->flags & AVIO_FLAG_WRITE)) { | |
661 | bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len); | |
662 | } | |
663 | /* bind to the local address if not multicast or if the multicast | |
664 | * bind failed */ | |
665 | /* the bind is needed to give a port to the socket now */ | |
666 | if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) { | |
667 | log_net_error(h, AV_LOG_ERROR, "bind failed"); | |
668 | goto fail; | |
669 | } | |
670 | ||
671 | len = sizeof(my_addr); | |
672 | getsockname(udp_fd, (struct sockaddr *)&my_addr, &len); | |
673 | s->local_port = udp_port(&my_addr, len); | |
674 | ||
675 | if (s->is_multicast) { | |
676 | if (h->flags & AVIO_FLAG_WRITE) { | |
677 | /* output */ | |
678 | if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0) | |
679 | goto fail; | |
680 | } | |
681 | if (h->flags & AVIO_FLAG_READ) { | |
682 | /* input */ | |
683 | if (num_include_sources && num_exclude_sources) { | |
684 | av_log(h, AV_LOG_ERROR, "Simultaneously including and excluding multicast sources is not supported\n"); | |
685 | goto fail; | |
686 | } | |
687 | if (num_include_sources) { | |
688 | if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, include_sources, num_include_sources, 1) < 0) | |
689 | goto fail; | |
690 | } else { | |
691 | if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage) < 0) | |
692 | goto fail; | |
693 | } | |
694 | if (num_exclude_sources) { | |
695 | if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, exclude_sources, num_exclude_sources, 0) < 0) | |
696 | goto fail; | |
697 | } | |
698 | } | |
699 | } | |
700 | ||
701 | if (is_output) { | |
702 | /* limit the tx buf size to limit latency */ | |
703 | tmp = s->buffer_size; | |
704 | if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) { | |
705 | log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)"); | |
706 | goto fail; | |
707 | } | |
708 | } else { | |
709 | /* set udp recv buffer size to the requested value (default 64K) */ | |
710 | tmp = s->buffer_size; | |
711 | if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) { | |
712 | log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)"); | |
713 | } | |
714 | len = sizeof(tmp); | |
715 | if (getsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, &len) < 0) { | |
716 | log_net_error(h, AV_LOG_WARNING, "getsockopt(SO_RCVBUF)"); | |
717 | } else { | |
718 | av_log(h, AV_LOG_DEBUG, "end receive buffer size reported is %d\n", tmp); | |
719 | if(tmp < s->buffer_size) | |
720 | av_log(h, AV_LOG_WARNING, "attempted to set receive buffer to size %d but it only ended up set as %d", s->buffer_size, tmp); | |
721 | } | |
722 | ||
723 | /* make the socket non-blocking */ | |
724 | ff_socket_nonblock(udp_fd, 1); | |
725 | } | |
726 | if (s->is_connected) { | |
727 | if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) { | |
728 | log_net_error(h, AV_LOG_ERROR, "connect"); | |
729 | goto fail; | |
730 | } | |
731 | } | |
732 | ||
733 | for (i = 0; i < num_include_sources; i++) | |
734 | av_freep(&include_sources[i]); | |
735 | for (i = 0; i < num_exclude_sources; i++) | |
736 | av_freep(&exclude_sources[i]); | |
737 | ||
738 | s->udp_fd = udp_fd; | |
739 | ||
740 | #if HAVE_PTHREAD_CANCEL | |
741 | if (!is_output && s->circular_buffer_size) { | |
742 | int ret; | |
743 | ||
744 | /* start the task going */ | |
745 | s->fifo = av_fifo_alloc(s->circular_buffer_size); | |
746 | ret = pthread_mutex_init(&s->mutex, NULL); | |
747 | if (ret != 0) { | |
748 | av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", strerror(ret)); | |
749 | goto fail; | |
750 | } | |
751 | ret = pthread_cond_init(&s->cond, NULL); | |
752 | if (ret != 0) { | |
753 | av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", strerror(ret)); | |
754 | goto cond_fail; | |
755 | } | |
756 | ret = pthread_create(&s->circular_buffer_thread, NULL, circular_buffer_task, h); | |
757 | if (ret != 0) { | |
758 | av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", strerror(ret)); | |
759 | goto thread_fail; | |
760 | } | |
761 | s->thread_started = 1; | |
762 | } | |
763 | #endif | |
764 | ||
765 | return 0; | |
766 | #if HAVE_PTHREAD_CANCEL | |
767 | thread_fail: | |
768 | pthread_cond_destroy(&s->cond); | |
769 | cond_fail: | |
770 | pthread_mutex_destroy(&s->mutex); | |
771 | #endif | |
772 | fail: | |
773 | if (udp_fd >= 0) | |
774 | closesocket(udp_fd); | |
775 | av_fifo_freep(&s->fifo); | |
776 | for (i = 0; i < num_include_sources; i++) | |
777 | av_freep(&include_sources[i]); | |
778 | for (i = 0; i < num_exclude_sources; i++) | |
779 | av_freep(&exclude_sources[i]); | |
780 | return AVERROR(EIO); | |
781 | } | |
782 | ||
783 | static int udp_read(URLContext *h, uint8_t *buf, int size) | |
784 | { | |
785 | UDPContext *s = h->priv_data; | |
786 | int ret; | |
787 | #if HAVE_PTHREAD_CANCEL | |
788 | int avail, nonblock = h->flags & AVIO_FLAG_NONBLOCK; | |
789 | ||
790 | if (s->fifo) { | |
791 | pthread_mutex_lock(&s->mutex); | |
792 | do { | |
793 | avail = av_fifo_size(s->fifo); | |
794 | if (avail) { // >=size) { | |
795 | uint8_t tmp[4]; | |
796 | ||
797 | av_fifo_generic_read(s->fifo, tmp, 4, NULL); | |
798 | avail= AV_RL32(tmp); | |
799 | if(avail > size){ | |
800 | av_log(h, AV_LOG_WARNING, "Part of datagram lost due to insufficient buffer size\n"); | |
801 | avail= size; | |
802 | } | |
803 | ||
804 | av_fifo_generic_read(s->fifo, buf, avail, NULL); | |
805 | av_fifo_drain(s->fifo, AV_RL32(tmp) - avail); | |
806 | pthread_mutex_unlock(&s->mutex); | |
807 | return avail; | |
808 | } else if(s->circular_buffer_error){ | |
809 | int err = s->circular_buffer_error; | |
810 | pthread_mutex_unlock(&s->mutex); | |
811 | return err; | |
812 | } else if(nonblock) { | |
813 | pthread_mutex_unlock(&s->mutex); | |
814 | return AVERROR(EAGAIN); | |
815 | } | |
816 | else { | |
817 | /* FIXME: using the monotonic clock would be better, | |
818 | but it does not exist on all supported platforms. */ | |
819 | int64_t t = av_gettime() + 100000; | |
820 | struct timespec tv = { .tv_sec = t / 1000000, | |
821 | .tv_nsec = (t % 1000000) * 1000 }; | |
822 | if (pthread_cond_timedwait(&s->cond, &s->mutex, &tv) < 0) { | |
823 | pthread_mutex_unlock(&s->mutex); | |
824 | return AVERROR(errno == ETIMEDOUT ? EAGAIN : errno); | |
825 | } | |
826 | nonblock = 1; | |
827 | } | |
828 | } while( 1); | |
829 | } | |
830 | #endif | |
831 | ||
832 | if (!(h->flags & AVIO_FLAG_NONBLOCK)) { | |
833 | ret = ff_network_wait_fd(s->udp_fd, 0); | |
834 | if (ret < 0) | |
835 | return ret; | |
836 | } | |
837 | ret = recv(s->udp_fd, buf, size, 0); | |
838 | ||
839 | return ret < 0 ? ff_neterrno() : ret; | |
840 | } | |
841 | ||
842 | static int udp_write(URLContext *h, const uint8_t *buf, int size) | |
843 | { | |
844 | UDPContext *s = h->priv_data; | |
845 | int ret; | |
846 | ||
847 | if (!(h->flags & AVIO_FLAG_NONBLOCK)) { | |
848 | ret = ff_network_wait_fd(s->udp_fd, 1); | |
849 | if (ret < 0) | |
850 | return ret; | |
851 | } | |
852 | ||
853 | if (!s->is_connected) { | |
854 | ret = sendto (s->udp_fd, buf, size, 0, | |
855 | (struct sockaddr *) &s->dest_addr, | |
856 | s->dest_addr_len); | |
857 | } else | |
858 | ret = send(s->udp_fd, buf, size, 0); | |
859 | ||
860 | return ret < 0 ? ff_neterrno() : ret; | |
861 | } | |
862 | ||
863 | static int udp_close(URLContext *h) | |
864 | { | |
865 | UDPContext *s = h->priv_data; | |
866 | ||
867 | if (s->is_multicast && (h->flags & AVIO_FLAG_READ)) | |
868 | udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage); | |
869 | closesocket(s->udp_fd); | |
870 | #if HAVE_PTHREAD_CANCEL | |
871 | if (s->thread_started) { | |
872 | int ret; | |
873 | pthread_cancel(s->circular_buffer_thread); | |
874 | ret = pthread_join(s->circular_buffer_thread, NULL); | |
875 | if (ret != 0) | |
876 | av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", strerror(ret)); | |
877 | pthread_mutex_destroy(&s->mutex); | |
878 | pthread_cond_destroy(&s->cond); | |
879 | } | |
880 | #endif | |
881 | av_fifo_freep(&s->fifo); | |
882 | return 0; | |
883 | } | |
884 | ||
885 | URLProtocol ff_udp_protocol = { | |
886 | .name = "udp", | |
887 | .url_open = udp_open, | |
888 | .url_read = udp_read, | |
889 | .url_write = udp_write, | |
890 | .url_close = udp_close, | |
891 | .url_get_file_handle = udp_get_file_handle, | |
892 | .priv_data_size = sizeof(UDPContext), | |
893 | .priv_data_class = &udp_context_class, | |
894 | .flags = URL_PROTOCOL_FLAG_NETWORK, | |
895 | }; |