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 "avio_internal.h"
31 #include "libavutil/parseutils.h"
35 #include "os_support.h"
41 #ifndef IPV6_ADD_MEMBERSHIP
42 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
43 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
53 struct sockaddr_storage dest_addr;
58 #define UDP_TX_BUF_SIZE 32768
59 #define UDP_MAX_PKT_SIZE 65536
61 static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
62 struct sockaddr *addr)
64 #ifdef IP_MULTICAST_TTL
65 if (addr->sa_family == AF_INET) {
66 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
67 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
72 #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
73 if (addr->sa_family == AF_INET6) {
74 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
75 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
83 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
85 #ifdef IP_ADD_MEMBERSHIP
86 if (addr->sa_family == AF_INET) {
89 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
90 mreq.imr_interface.s_addr= INADDR_ANY;
91 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
92 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
97 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
98 if (addr->sa_family == AF_INET6) {
99 struct ipv6_mreq mreq6;
101 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
102 mreq6.ipv6mr_interface= 0;
103 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
104 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
112 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr)
114 #ifdef IP_DROP_MEMBERSHIP
115 if (addr->sa_family == AF_INET) {
118 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
119 mreq.imr_interface.s_addr= INADDR_ANY;
120 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
121 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
126 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
127 if (addr->sa_family == AF_INET6) {
128 struct ipv6_mreq mreq6;
130 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
131 mreq6.ipv6mr_interface= 0;
132 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
133 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
141 static struct addrinfo* udp_resolve_host(const char *hostname, int port,
142 int type, int family, int flags)
144 struct addrinfo hints, *res = 0;
147 const char *node = 0, *service = "0";
150 snprintf(sport, sizeof(sport), "%d", port);
153 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
156 memset(&hints, 0, sizeof(hints));
157 hints.ai_socktype = type;
158 hints.ai_family = family;
159 hints.ai_flags = flags;
160 if ((error = getaddrinfo(node, service, &hints, &res))) {
162 av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
168 static int udp_set_url(struct sockaddr_storage *addr,
169 const char *hostname, int port)
171 struct addrinfo *res0;
174 res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
175 if (res0 == 0) return AVERROR(EIO);
176 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
177 addr_len = res0->ai_addrlen;
183 static int udp_socket_create(UDPContext *s,
184 struct sockaddr_storage *addr, int *addr_len)
187 struct addrinfo *res0 = NULL, *res = NULL;
188 int family = AF_UNSPEC;
190 if (((struct sockaddr *) &s->dest_addr)->sa_family)
191 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
192 res0 = udp_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
195 for (res = res0; res; res=res->ai_next) {
196 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
197 if (udp_fd > 0) break;
198 av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
204 memcpy(addr, res->ai_addr, res->ai_addrlen);
205 *addr_len = res->ai_addrlen;
219 static int udp_port(struct sockaddr_storage *addr, int addr_len)
221 char sbuf[sizeof(int)*3+1];
223 if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
224 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
228 return strtol(sbuf, NULL, 10);
233 * If no filename is given to av_open_input_file because you want to
234 * get the local port first, then you must call this function to set
235 * the remote server address.
237 * url syntax: udp://host:port[?option=val...]
238 * option: 'ttl=n' : set the ttl value (for multicast only)
239 * 'localport=n' : set the local port
240 * 'pkt_size=n' : set max packet size
241 * 'reuse=1' : enable reusing the socket
243 * @param h media file context
244 * @param uri of the remote server
245 * @return zero if no error.
247 int ff_udp_set_remote_url(URLContext *h, const char *uri)
249 UDPContext *s = h->priv_data;
250 char hostname[256], buf[10];
254 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
256 /* set the destination address */
257 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
258 if (s->dest_addr_len < 0) {
261 s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
262 p = strchr(uri, '?');
264 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
265 int was_connected = s->is_connected;
266 s->is_connected = strtol(buf, NULL, 10);
267 if (s->is_connected && !was_connected) {
268 if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
271 av_log(NULL, AV_LOG_ERROR, "connect: %s\n", strerror(errno));
282 * Return the local port used by the UDP connection
283 * @param h media file context
284 * @return the local port number
286 int ff_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 !FF_API_UDP_GET_FILE
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;
318 int reuse_specified = 0;
321 h->max_packet_size = 1472;
323 is_output = (flags & URL_WRONLY);
325 s = av_mallocz(sizeof(UDPContext));
327 return AVERROR(ENOMEM);
331 s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
333 p = strchr(uri, '?');
335 if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
336 const char *endptr=NULL;
337 s->reuse_socket = strtol(buf, &endptr, 10);
338 /* assume if no digits were found it is a request to enable it */
343 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
344 s->ttl = strtol(buf, NULL, 10);
346 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
347 s->local_port = strtol(buf, NULL, 10);
349 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
350 h->max_packet_size = strtol(buf, NULL, 10);
352 if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
353 s->buffer_size = strtol(buf, NULL, 10);
355 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
356 s->is_connected = strtol(buf, NULL, 10);
360 /* fill the dest addr */
361 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
363 /* XXX: fix av_url_split */
364 if (hostname[0] == '\0' || hostname[0] == '?') {
365 /* only accepts null hostname if input */
366 if (flags & URL_WRONLY)
369 if (ff_udp_set_remote_url(h, uri) < 0)
373 if (s->is_multicast && !(h->flags & URL_WRONLY))
374 s->local_port = port;
375 udp_fd = udp_socket_create(s, &my_addr, &len);
379 /* Follow the requested reuse option, unless it's multicast in which
380 * case enable reuse unless explicitely disabled.
382 if (s->reuse_socket || (s->is_multicast && !reuse_specified)) {
384 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
388 /* the bind is needed to give a port to the socket now */
389 /* if multicast, try the multicast address bind first */
390 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
391 bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
393 /* bind to the local address if not multicast or if the multicast
395 if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
398 len = sizeof(my_addr);
399 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
400 s->local_port = udp_port(&my_addr, len);
402 if (s->is_multicast) {
403 if (h->flags & URL_WRONLY) {
405 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
409 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
415 /* limit the tx buf size to limit latency */
416 tmp = s->buffer_size;
417 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
418 av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
422 /* set udp recv buffer size to the largest possible udp packet size to
423 * avoid losing data on OSes that set this too low by default. */
424 tmp = s->buffer_size;
425 if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
426 av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_RECVBUF): %s\n", strerror(errno));
428 /* make the socket non-blocking */
429 ff_socket_nonblock(udp_fd, 1);
431 if (s->is_connected) {
432 if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
433 av_log(NULL, AV_LOG_ERROR, "connect: %s\n", strerror(errno));
447 static int udp_read(URLContext *h, uint8_t *buf, int size)
449 UDPContext *s = h->priv_data;
450 struct pollfd p = {s->udp_fd, POLLIN, 0};
455 if (url_interrupt_cb())
457 ret = poll(&p, 1, 100);
459 if (ff_neterrno() == AVERROR(EINTR))
463 if (!(ret == 1 && p.revents & POLLIN))
465 len = recv(s->udp_fd, buf, size, 0);
467 if (ff_neterrno() != AVERROR(EAGAIN) &&
468 ff_neterrno() != AVERROR(EINTR))
477 static int udp_write(URLContext *h, const uint8_t *buf, int size)
479 UDPContext *s = h->priv_data;
483 if (!s->is_connected) {
484 ret = sendto (s->udp_fd, buf, size, 0,
485 (struct sockaddr *) &s->dest_addr,
488 ret = send(s->udp_fd, buf, size, 0);
490 if (ff_neterrno() != AVERROR(EINTR) &&
491 ff_neterrno() != AVERROR(EAGAIN))
492 return ff_neterrno();
500 static int udp_close(URLContext *h)
502 UDPContext *s = h->priv_data;
504 if (s->is_multicast && !(h->flags & URL_WRONLY))
505 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
506 closesocket(s->udp_fd);
511 URLProtocol ff_udp_protocol = {
518 .url_get_file_handle = udp_get_file_handle,