2 * UDP prototype streaming system
3 * Copyright (c) 2000, 2001, 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 #define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */
28 #define _DARWIN_C_SOURCE /* Needed for using IP_MULTICAST_TTL on OS X */
30 #include "libavutil/parseutils.h"
34 #include "os_support.h"
40 #ifndef IPV6_ADD_MEMBERSHIP
41 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
42 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
52 struct sockaddr_storage dest_addr;
57 #define UDP_TX_BUF_SIZE 32768
58 #define UDP_MAX_PKT_SIZE 65536
60 static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
61 struct sockaddr *addr)
63 #ifdef IP_MULTICAST_TTL
64 if (addr->sa_family == AF_INET) {
65 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
66 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
71 #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
72 if (addr->sa_family == AF_INET6) {
73 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
74 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
82 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
84 #ifdef IP_ADD_MEMBERSHIP
85 if (addr->sa_family == AF_INET) {
88 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
89 mreq.imr_interface.s_addr= INADDR_ANY;
90 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
91 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
96 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
97 if (addr->sa_family == AF_INET6) {
98 struct ipv6_mreq mreq6;
100 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
101 mreq6.ipv6mr_interface= 0;
102 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
103 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
111 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr)
113 #ifdef IP_DROP_MEMBERSHIP
114 if (addr->sa_family == AF_INET) {
117 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
118 mreq.imr_interface.s_addr= INADDR_ANY;
119 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
120 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
125 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
126 if (addr->sa_family == AF_INET6) {
127 struct ipv6_mreq mreq6;
129 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
130 mreq6.ipv6mr_interface= 0;
131 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
132 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
140 static struct addrinfo* udp_resolve_host(const char *hostname, int port,
141 int type, int family, int flags)
143 struct addrinfo hints, *res = 0;
146 const char *node = 0, *service = "0";
149 snprintf(sport, sizeof(sport), "%d", port);
152 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
155 memset(&hints, 0, sizeof(hints));
156 hints.ai_socktype = type;
157 hints.ai_family = family;
158 hints.ai_flags = flags;
159 if ((error = getaddrinfo(node, service, &hints, &res))) {
161 av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
167 static int udp_set_url(struct sockaddr_storage *addr,
168 const char *hostname, int port)
170 struct addrinfo *res0;
173 res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
174 if (res0 == 0) return AVERROR(EIO);
175 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
176 addr_len = res0->ai_addrlen;
182 static int udp_socket_create(UDPContext *s,
183 struct sockaddr_storage *addr, int *addr_len)
186 struct addrinfo *res0 = NULL, *res = NULL;
187 int family = AF_UNSPEC;
189 if (((struct sockaddr *) &s->dest_addr)->sa_family)
190 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
191 res0 = udp_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
194 for (res = res0; res; res=res->ai_next) {
195 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
196 if (udp_fd > 0) break;
197 av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
203 memcpy(addr, res->ai_addr, res->ai_addrlen);
204 *addr_len = res->ai_addrlen;
218 static int udp_port(struct sockaddr_storage *addr, int addr_len)
220 char sbuf[sizeof(int)*3+1];
222 if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
223 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
227 return strtol(sbuf, NULL, 10);
232 * If no filename is given to av_open_input_file because you want to
233 * get the local port first, then you must call this function to set
234 * the remote server address.
236 * url syntax: udp://host:port[?option=val...]
237 * option: 'ttl=n' : set the ttl value (for multicast only)
238 * 'localport=n' : set the local port
239 * 'pkt_size=n' : set max packet size
240 * 'reuse=1' : enable reusing the socket
242 * @param h media file context
243 * @param uri of the remote server
244 * @return zero if no error.
246 int udp_set_remote_url(URLContext *h, const char *uri)
248 UDPContext *s = h->priv_data;
249 char hostname[256], buf[10];
253 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
255 /* set the destination address */
256 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
257 if (s->dest_addr_len < 0) {
260 s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
261 p = strchr(uri, '?');
263 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
264 int was_connected = s->is_connected;
265 s->is_connected = strtol(buf, NULL, 10);
266 if (s->is_connected && !was_connected) {
267 if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
270 av_log(NULL, AV_LOG_ERROR, "connect: %s\n", strerror(errno));
281 * Return the local port used by the UDP connection
282 * @param h media file context
283 * @return the local port number
285 int udp_get_local_port(URLContext *h)
287 UDPContext *s = h->priv_data;
288 return s->local_port;
292 * Return the udp file handle for select() usage to wait for several RTP
293 * streams at the same time.
294 * @param h media file context
296 #if !FF_API_UDP_GET_FILE
299 int udp_get_file_handle(URLContext *h)
301 UDPContext *s = h->priv_data;
305 /* put it in UDP context */
306 /* return non zero if error */
307 static int udp_open(URLContext *h, const char *uri, int flags)
310 int port, udp_fd = -1, tmp, bind_ret = -1;
311 UDPContext *s = NULL;
315 struct sockaddr_storage my_addr;
317 int reuse_specified = 0;
320 h->max_packet_size = 1472;
322 is_output = (flags & URL_WRONLY);
324 s = av_mallocz(sizeof(UDPContext));
326 return AVERROR(ENOMEM);
330 s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
332 p = strchr(uri, '?');
334 if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
335 const char *endptr=NULL;
336 s->reuse_socket = strtol(buf, &endptr, 10);
337 /* assume if no digits were found it is a request to enable it */
342 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
343 s->ttl = strtol(buf, NULL, 10);
345 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
346 s->local_port = strtol(buf, NULL, 10);
348 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
349 h->max_packet_size = strtol(buf, NULL, 10);
351 if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
352 s->buffer_size = strtol(buf, NULL, 10);
354 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
355 s->is_connected = strtol(buf, NULL, 10);
359 /* fill the dest addr */
360 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
362 /* XXX: fix av_url_split */
363 if (hostname[0] == '\0' || hostname[0] == '?') {
364 /* only accepts null hostname if input */
365 if (flags & URL_WRONLY)
368 if (udp_set_remote_url(h, uri) < 0)
372 if (s->is_multicast && !(h->flags & URL_WRONLY))
373 s->local_port = port;
374 udp_fd = udp_socket_create(s, &my_addr, &len);
378 /* Follow the requested reuse option, unless it's multicast in which
379 * case enable reuse unless explicitely disabled.
381 if (s->reuse_socket || (s->is_multicast && !reuse_specified)) {
383 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
387 /* the bind is needed to give a port to the socket now */
388 /* if multicast, try the multicast address bind first */
389 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
390 bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
392 /* bind to the local address if not multicast or if the multicast
394 if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
397 len = sizeof(my_addr);
398 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
399 s->local_port = udp_port(&my_addr, len);
401 if (s->is_multicast) {
402 if (h->flags & URL_WRONLY) {
404 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
408 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
414 /* limit the tx buf size to limit latency */
415 tmp = s->buffer_size;
416 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
417 av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
421 /* set udp recv buffer size to the largest possible udp packet size to
422 * avoid losing data on OSes that set this too low by default. */
423 tmp = s->buffer_size;
424 if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
425 av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_RECVBUF): %s\n", strerror(errno));
427 /* make the socket non-blocking */
428 ff_socket_nonblock(udp_fd, 1);
430 if (s->is_connected) {
431 if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
432 av_log(NULL, AV_LOG_ERROR, "connect: %s\n", strerror(errno));
446 static int udp_read(URLContext *h, uint8_t *buf, int size)
448 UDPContext *s = h->priv_data;
449 struct pollfd p = {s->udp_fd, POLLIN, 0};
454 if (url_interrupt_cb())
455 return AVERROR(EINTR);
456 ret = poll(&p, 1, 100);
458 if (ff_neterrno() == AVERROR(EINTR))
462 if (!(ret == 1 && p.revents & POLLIN))
464 len = recv(s->udp_fd, buf, size, 0);
466 if (ff_neterrno() != AVERROR(EAGAIN) &&
467 ff_neterrno() != AVERROR(EINTR))
476 static int udp_write(URLContext *h, const uint8_t *buf, int size)
478 UDPContext *s = h->priv_data;
482 if (!s->is_connected) {
483 ret = sendto (s->udp_fd, buf, size, 0,
484 (struct sockaddr *) &s->dest_addr,
487 ret = send(s->udp_fd, buf, size, 0);
489 if (ff_neterrno() != AVERROR(EINTR) &&
490 ff_neterrno() != AVERROR(EAGAIN))
491 return ff_neterrno();
499 static int udp_close(URLContext *h)
501 UDPContext *s = h->priv_data;
503 if (s->is_multicast && !(h->flags & URL_WRONLY))
504 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
505 closesocket(s->udp_fd);
510 URLProtocol ff_udp_protocol = {
517 .url_get_file_handle = udp_get_file_handle,