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
24 #include "os_support.h"
26 #ifndef IPV6_ADD_MEMBERSHIP
27 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
28 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
38 struct sockaddr_in dest_addr;
40 struct sockaddr_storage dest_addr;
45 #define UDP_TX_BUF_SIZE 32768
46 #define UDP_MAX_PKT_SIZE 65536
48 static int udp_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
49 #ifdef IP_MULTICAST_TTL
50 if (addr->sa_family == AF_INET) {
51 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
52 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
58 if (addr->sa_family == AF_INET6) {
59 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
60 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
68 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr) {
69 #ifdef IP_ADD_MEMBERSHIP
70 if (addr->sa_family == AF_INET) {
73 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
74 mreq.imr_interface.s_addr= INADDR_ANY;
75 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
76 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
82 if (addr->sa_family == AF_INET6) {
83 struct ipv6_mreq mreq6;
85 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
86 mreq6.ipv6mr_interface= 0;
87 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
88 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
96 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr) {
97 #ifdef IP_DROP_MEMBERSHIP
98 if (addr->sa_family == AF_INET) {
101 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
102 mreq.imr_interface.s_addr= INADDR_ANY;
103 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
104 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
110 if (addr->sa_family == AF_INET6) {
111 struct ipv6_mreq mreq6;
113 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
114 mreq6.ipv6mr_interface= 0;
115 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
116 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
125 static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
126 struct addrinfo hints, *res = 0;
129 const char *node = 0, *service = "0";
132 snprintf(sport, sizeof(sport), "%d", port);
135 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
138 memset(&hints, 0, sizeof(hints));
139 hints.ai_socktype = type;
140 hints.ai_family = family;
141 hints.ai_flags = flags;
142 if ((error = getaddrinfo(node, service, &hints, &res))) {
143 av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
149 static int udp_set_url(struct sockaddr_storage *addr, const char *hostname, int port) {
150 struct addrinfo *res0;
153 res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
154 if (res0 == 0) return AVERROR(EIO);
155 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
156 addr_len = res0->ai_addrlen;
162 static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, int *addr_len)
165 struct addrinfo *res0 = NULL, *res = NULL;
166 int family = AF_UNSPEC;
168 if (((struct sockaddr *) &s->dest_addr)->sa_family)
169 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
170 res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
173 for (res = res0; res; res=res->ai_next) {
174 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
175 if (udp_fd > 0) break;
176 av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
182 memcpy(addr, res->ai_addr, res->ai_addrlen);
183 *addr_len = res->ai_addrlen;
197 static int udp_port(struct sockaddr_storage *addr, int addr_len)
199 char sbuf[NI_MAXSERV];
200 char hbuf[NI_MAXHOST];
202 if (getnameinfo((struct sockaddr *)addr, addr_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
203 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
207 return strtol(sbuf, NULL, 10);
212 static int udp_set_url(struct sockaddr_in *addr, const char *hostname, int port)
214 /* set the destination address */
215 if (resolve_host(&addr->sin_addr, hostname) < 0)
217 addr->sin_family = AF_INET;
218 addr->sin_port = htons(port);
220 return sizeof(struct sockaddr_in);
223 static int udp_socket_create(UDPContext *s, struct sockaddr_in *addr, int *addr_len)
227 fd = socket(AF_INET, SOCK_DGRAM, 0);
231 addr->sin_family = AF_INET;
232 addr->sin_addr.s_addr = htonl (INADDR_ANY);
233 addr->sin_port = htons(s->local_port);
234 *addr_len = sizeof(struct sockaddr_in);
239 static int udp_port(struct sockaddr_in *addr, int len)
241 return ntohs(addr->sin_port);
243 #endif /* CONFIG_IPV6 */
247 * If no filename is given to av_open_input_file because you want to
248 * get the local port first, then you must call this function to set
249 * the remote server address.
251 * url syntax: udp://host:port[?option=val...]
252 * option: 'multicast=1' : enable multicast
253 * 'ttl=n' : set the ttl value (for multicast only)
254 * 'localport=n' : set the local port
255 * 'pkt_size=n' : set max packet size
256 * 'reuse=1' : enable reusing the socket
258 * @param s1 media file context
259 * @param uri of the remote server
260 * @return zero if no error.
262 int udp_set_remote_url(URLContext *h, const char *uri)
264 UDPContext *s = h->priv_data;
268 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
270 /* set the destination address */
271 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
272 if (s->dest_addr_len < 0) {
280 * Return the local port used by the UDP connexion
281 * @param s1 media file context
282 * @return the local port number
284 int udp_get_local_port(URLContext *h)
286 UDPContext *s = h->priv_data;
287 return s->local_port;
291 * Return the udp file handle for select() usage to wait for several RTP
292 * streams at the same time.
293 * @param h media file context
295 int udp_get_file_handle(URLContext *h)
297 UDPContext *s = h->priv_data;
301 /* put it in UDP context */
302 /* return non zero if error */
303 static int udp_open(URLContext *h, const char *uri, int flags)
306 int port, udp_fd = -1, tmp;
307 UDPContext *s = NULL;
312 struct sockaddr_in my_addr;
314 struct sockaddr_storage my_addr;
319 h->max_packet_size = 1472;
321 is_output = (flags & URL_WRONLY);
323 s = av_mallocz(sizeof(UDPContext));
325 return AVERROR(ENOMEM);
329 p = strchr(uri, '?');
331 s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
332 s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
333 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
334 s->ttl = strtol(buf, NULL, 10);
336 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
337 s->local_port = strtol(buf, NULL, 10);
339 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
340 h->max_packet_size = strtol(buf, NULL, 10);
344 /* fill the dest addr */
345 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
347 /* XXX: fix url_split */
348 if (hostname[0] == '\0' || hostname[0] == '?') {
349 /* only accepts null hostname if input */
350 if (s->is_multicast || (flags & URL_WRONLY))
353 udp_set_remote_url(h, uri);
356 if(!ff_network_init())
359 if (s->is_multicast && !(h->flags & URL_WRONLY))
360 s->local_port = port;
361 udp_fd = udp_socket_create(s, &my_addr, &len);
366 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
369 /* the bind is needed to give a port to the socket now */
370 if (bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
373 len = sizeof(my_addr);
374 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
375 s->local_port = udp_port(&my_addr, len);
377 if (s->is_multicast) {
378 if (h->flags & URL_WRONLY) {
380 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
384 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
390 /* limit the tx buf size to limit latency */
391 tmp = UDP_TX_BUF_SIZE;
392 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
393 av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
397 /* set udp recv buffer size to the largest possible udp packet size to
398 * avoid losing data on OSes that set this too low by default. */
399 tmp = UDP_MAX_PKT_SIZE;
400 setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
412 static int udp_read(URLContext *h, uint8_t *buf, int size)
414 UDPContext *s = h->priv_data;
418 len = recv(s->udp_fd, buf, size, 0);
420 if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
421 ff_neterrno() != FF_NETERROR(EINTR))
430 static int udp_write(URLContext *h, uint8_t *buf, int size)
432 UDPContext *s = h->priv_data;
436 ret = sendto (s->udp_fd, buf, size, 0,
437 (struct sockaddr *) &s->dest_addr,
440 if (ff_neterrno() != FF_NETERROR(EINTR) &&
441 ff_neterrno() != FF_NETERROR(EAGAIN))
450 static int udp_close(URLContext *h)
452 UDPContext *s = h->priv_data;
454 if (s->is_multicast && !(h->flags & URL_WRONLY))
455 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
456 closesocket(s->udp_fd);
462 URLProtocol udp_protocol = {