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 */
32 #include "os_support.h"
34 #include <sys/select.h>
38 #ifndef IPV6_ADD_MEMBERSHIP
39 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
40 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
43 #define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
45 #ifndef IN6_IS_ADDR_MULTICAST
46 #define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
56 struct sockaddr_storage dest_addr;
60 #define UDP_TX_BUF_SIZE 32768
61 #define UDP_MAX_PKT_SIZE 65536
63 static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
64 struct sockaddr *addr)
66 #ifdef IP_MULTICAST_TTL
67 if (addr->sa_family == AF_INET) {
68 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
69 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
74 #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
75 if (addr->sa_family == AF_INET6) {
76 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
77 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
85 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
87 #ifdef IP_ADD_MEMBERSHIP
88 if (addr->sa_family == AF_INET) {
91 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
92 mreq.imr_interface.s_addr= INADDR_ANY;
93 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
94 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
99 #if HAVE_STRUCT_IPV6_MREQ
100 if (addr->sa_family == AF_INET6) {
101 struct ipv6_mreq mreq6;
103 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
104 mreq6.ipv6mr_interface= 0;
105 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
106 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
114 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr)
116 #ifdef IP_DROP_MEMBERSHIP
117 if (addr->sa_family == AF_INET) {
120 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
121 mreq.imr_interface.s_addr= INADDR_ANY;
122 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
123 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
128 #if HAVE_STRUCT_IPV6_MREQ
129 if (addr->sa_family == AF_INET6) {
130 struct ipv6_mreq mreq6;
132 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
133 mreq6.ipv6mr_interface= 0;
134 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
135 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
143 static struct addrinfo* udp_resolve_host(const char *hostname, int port,
144 int type, int family, int flags)
146 struct addrinfo hints, *res = 0;
149 const char *node = 0, *service = "0";
152 snprintf(sport, sizeof(sport), "%d", port);
155 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
158 memset(&hints, 0, sizeof(hints));
159 hints.ai_socktype = type;
160 hints.ai_family = family;
161 hints.ai_flags = flags;
162 if ((error = getaddrinfo(node, service, &hints, &res))) {
164 av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
170 static int udp_set_url(struct sockaddr_storage *addr,
171 const char *hostname, int port)
173 struct addrinfo *res0;
176 res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
177 if (res0 == 0) return AVERROR(EIO);
178 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
179 addr_len = res0->ai_addrlen;
185 static int is_multicast_address(struct sockaddr_storage *addr)
187 if (addr->ss_family == AF_INET) {
188 return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
190 #if HAVE_STRUCT_SOCKADDR_IN6
191 if (addr->ss_family == AF_INET6) {
192 return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
199 static int udp_socket_create(UDPContext *s,
200 struct sockaddr_storage *addr, int *addr_len)
203 struct addrinfo *res0 = NULL, *res = NULL;
204 int family = AF_UNSPEC;
206 if (((struct sockaddr *) &s->dest_addr)->sa_family)
207 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
208 res0 = udp_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
211 for (res = res0; res; res=res->ai_next) {
212 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
213 if (udp_fd > 0) break;
214 av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
220 memcpy(addr, res->ai_addr, res->ai_addrlen);
221 *addr_len = res->ai_addrlen;
235 static int udp_port(struct sockaddr_storage *addr, int addr_len)
237 char sbuf[sizeof(int)*3+1];
239 if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
240 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
244 return strtol(sbuf, NULL, 10);
249 * If no filename is given to av_open_input_file because you want to
250 * get the local port first, then you must call this function to set
251 * the remote server address.
253 * url syntax: udp://host:port[?option=val...]
254 * option: 'ttl=n' : set the ttl value (for multicast only)
255 * 'localport=n' : set the local port
256 * 'pkt_size=n' : set max packet size
257 * 'reuse=1' : enable reusing the socket
259 * @param h media file context
260 * @param uri of the remote server
261 * @return zero if no error.
263 int udp_set_remote_url(URLContext *h, const char *uri)
265 UDPContext *s = h->priv_data;
269 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
271 /* set the destination address */
272 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
273 if (s->dest_addr_len < 0) {
276 s->is_multicast = is_multicast_address(&s->dest_addr);
282 * Return the local port used by the UDP connection
283 * @param h media file context
284 * @return the local port number
286 int udp_get_local_port(URLContext *h)
288 UDPContext *s = h->priv_data;
289 return s->local_port;
293 * Return the udp file handle for select() usage to wait for several RTP
294 * streams at the same time.
295 * @param h media file context
297 #if (LIBAVFORMAT_VERSION_MAJOR >= 53)
300 int udp_get_file_handle(URLContext *h)
302 UDPContext *s = h->priv_data;
306 /* put it in UDP context */
307 /* return non zero if error */
308 static int udp_open(URLContext *h, const char *uri, int flags)
311 int port, udp_fd = -1, tmp, bind_ret = -1;
312 UDPContext *s = NULL;
316 struct sockaddr_storage my_addr;
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 s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
335 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
336 s->ttl = strtol(buf, NULL, 10);
338 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
339 s->local_port = strtol(buf, NULL, 10);
341 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
342 h->max_packet_size = strtol(buf, NULL, 10);
344 if (find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
345 s->buffer_size = strtol(buf, NULL, 10);
349 /* fill the dest addr */
350 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
352 /* XXX: fix av_url_split */
353 if (hostname[0] == '\0' || hostname[0] == '?') {
354 /* only accepts null hostname if input */
355 if (flags & URL_WRONLY)
358 udp_set_remote_url(h, uri);
361 if (s->is_multicast && !(h->flags & URL_WRONLY))
362 s->local_port = port;
363 udp_fd = udp_socket_create(s, &my_addr, &len);
368 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
371 /* the bind is needed to give a port to the socket now */
372 /* if multicast, try the multicast address bind first */
373 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
374 bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
376 /* bind to the local address if not multicast or if the multicast
378 if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
381 len = sizeof(my_addr);
382 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
383 s->local_port = udp_port(&my_addr, len);
385 if (s->is_multicast) {
386 if (h->flags & URL_WRONLY) {
388 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
392 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
398 /* limit the tx buf size to limit latency */
399 tmp = s->buffer_size;
400 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
401 av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
405 /* set udp recv buffer size to the largest possible udp packet size to
406 * avoid losing data on OSes that set this too low by default. */
407 tmp = s->buffer_size;
408 if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
409 av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_RECVBUF): %s\n", strerror(errno));
411 /* make the socket non-blocking */
412 ff_socket_nonblock(udp_fd, 1);
424 static int udp_read(URLContext *h, uint8_t *buf, int size)
426 UDPContext *s = h->priv_data;
433 if (url_interrupt_cb())
434 return AVERROR(EINTR);
436 FD_SET(s->udp_fd, &rfds);
438 tv.tv_usec = 100 * 1000;
439 ret = select(s->udp_fd + 1, &rfds, NULL, NULL, &tv);
441 if (ff_neterrno() == FF_NETERROR(EINTR))
445 if (!(ret > 0 && FD_ISSET(s->udp_fd, &rfds)))
447 len = recv(s->udp_fd, buf, size, 0);
449 if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
450 ff_neterrno() != FF_NETERROR(EINTR))
459 static int udp_write(URLContext *h, const uint8_t *buf, int size)
461 UDPContext *s = h->priv_data;
465 ret = sendto (s->udp_fd, buf, size, 0,
466 (struct sockaddr *) &s->dest_addr,
469 if (ff_neterrno() != FF_NETERROR(EINTR) &&
470 ff_neterrno() != FF_NETERROR(EAGAIN))
479 static int udp_close(URLContext *h)
481 UDPContext *s = h->priv_data;
483 if (s->is_multicast && !(h->flags & URL_WRONLY))
484 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
485 closesocket(s->udp_fd);
490 URLProtocol udp_protocol = {
497 .url_get_file_handle = udp_get_file_handle,