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
31 #define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
33 #ifndef IN6_IS_ADDR_MULTICAST
34 #define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
44 struct sockaddr_in dest_addr;
46 struct sockaddr_storage dest_addr;
51 #define UDP_TX_BUF_SIZE 32768
52 #define UDP_MAX_PKT_SIZE 65536
54 static int udp_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
55 #ifdef IP_MULTICAST_TTL
56 if (addr->sa_family == AF_INET) {
57 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
58 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
64 if (addr->sa_family == AF_INET6) {
65 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
66 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
74 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr) {
75 #ifdef IP_ADD_MEMBERSHIP
76 if (addr->sa_family == AF_INET) {
79 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
80 mreq.imr_interface.s_addr= INADDR_ANY;
81 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
82 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
88 if (addr->sa_family == AF_INET6) {
89 struct ipv6_mreq mreq6;
91 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
92 mreq6.ipv6mr_interface= 0;
93 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
94 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
102 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr) {
103 #ifdef IP_DROP_MEMBERSHIP
104 if (addr->sa_family == AF_INET) {
107 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
108 mreq.imr_interface.s_addr= INADDR_ANY;
109 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
110 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
116 if (addr->sa_family == AF_INET6) {
117 struct ipv6_mreq mreq6;
119 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
120 mreq6.ipv6mr_interface= 0;
121 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
122 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
131 static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
132 struct addrinfo hints, *res = 0;
135 const char *node = 0, *service = "0";
138 snprintf(sport, sizeof(sport), "%d", port);
141 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
144 memset(&hints, 0, sizeof(hints));
145 hints.ai_socktype = type;
146 hints.ai_family = family;
147 hints.ai_flags = flags;
148 if ((error = getaddrinfo(node, service, &hints, &res))) {
149 av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
155 static int udp_set_url(struct sockaddr_storage *addr, const char *hostname, int port) {
156 struct addrinfo *res0;
159 res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
160 if (res0 == 0) return AVERROR(EIO);
161 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
162 addr_len = res0->ai_addrlen;
168 static int is_multicast_address(struct sockaddr_storage *addr)
170 if (addr->ss_family == AF_INET) {
171 return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
173 if (addr->ss_family == AF_INET6) {
174 return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
180 static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, int *addr_len)
183 struct addrinfo *res0 = NULL, *res = NULL;
184 int family = AF_UNSPEC;
186 if (((struct sockaddr *) &s->dest_addr)->sa_family)
187 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
188 res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
191 for (res = res0; res; res=res->ai_next) {
192 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
193 if (udp_fd > 0) break;
194 av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
200 memcpy(addr, res->ai_addr, res->ai_addrlen);
201 *addr_len = res->ai_addrlen;
215 static int udp_port(struct sockaddr_storage *addr, int addr_len)
217 char sbuf[sizeof(int)*3+1];
219 if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
220 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
224 return strtol(sbuf, NULL, 10);
229 static int udp_set_url(struct sockaddr_in *addr, const char *hostname, int port)
231 /* set the destination address */
232 if (resolve_host(&addr->sin_addr, hostname) < 0)
234 addr->sin_family = AF_INET;
235 addr->sin_port = htons(port);
237 return sizeof(struct sockaddr_in);
240 static int is_multicast_address(struct sockaddr_in *addr)
242 return IN_MULTICAST(ntohl(addr->sin_addr.s_addr));
245 static int udp_socket_create(UDPContext *s, struct sockaddr_in *addr, int *addr_len)
249 fd = socket(AF_INET, SOCK_DGRAM, 0);
253 addr->sin_family = AF_INET;
254 addr->sin_addr.s_addr = htonl (INADDR_ANY);
255 addr->sin_port = htons(s->local_port);
256 *addr_len = sizeof(struct sockaddr_in);
261 static int udp_port(struct sockaddr_in *addr, int len)
263 return ntohs(addr->sin_port);
265 #endif /* CONFIG_IPV6 */
269 * If no filename is given to av_open_input_file because you want to
270 * get the local port first, then you must call this function to set
271 * the remote server address.
273 * url syntax: udp://host:port[?option=val...]
274 * option: 'ttl=n' : set the ttl value (for multicast only)
275 * 'localport=n' : set the local port
276 * 'pkt_size=n' : set max packet size
277 * 'reuse=1' : enable reusing the socket
279 * @param s1 media file context
280 * @param uri of the remote server
281 * @return zero if no error.
283 int udp_set_remote_url(URLContext *h, const char *uri)
285 UDPContext *s = h->priv_data;
289 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
291 /* set the destination address */
292 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
293 if (s->dest_addr_len < 0) {
296 s->is_multicast = is_multicast_address(&s->dest_addr);
302 * Return the local port used by the UDP connexion
303 * @param s1 media file context
304 * @return the local port number
306 int udp_get_local_port(URLContext *h)
308 UDPContext *s = h->priv_data;
309 return s->local_port;
313 * Return the udp file handle for select() usage to wait for several RTP
314 * streams at the same time.
315 * @param h media file context
317 int udp_get_file_handle(URLContext *h)
319 UDPContext *s = h->priv_data;
323 /* put it in UDP context */
324 /* return non zero if error */
325 static int udp_open(URLContext *h, const char *uri, int flags)
328 int port, udp_fd = -1, tmp;
329 UDPContext *s = NULL;
334 struct sockaddr_in my_addr;
336 struct sockaddr_storage my_addr;
341 h->max_packet_size = 1472;
343 is_output = (flags & URL_WRONLY);
345 s = av_mallocz(sizeof(UDPContext));
347 return AVERROR(ENOMEM);
351 p = strchr(uri, '?');
353 s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
354 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
355 s->ttl = strtol(buf, NULL, 10);
357 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
358 s->local_port = strtol(buf, NULL, 10);
360 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
361 h->max_packet_size = strtol(buf, NULL, 10);
365 /* fill the dest addr */
366 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
368 /* XXX: fix url_split */
369 if (hostname[0] == '\0' || hostname[0] == '?') {
370 /* only accepts null hostname if input */
371 if (flags & URL_WRONLY)
374 udp_set_remote_url(h, uri);
377 if(!ff_network_init())
380 if (s->is_multicast && !(h->flags & URL_WRONLY))
381 s->local_port = port;
382 udp_fd = udp_socket_create(s, &my_addr, &len);
387 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
390 /* the bind is needed to give a port to the socket now */
391 if (bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
394 len = sizeof(my_addr);
395 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
396 s->local_port = udp_port(&my_addr, len);
398 if (s->is_multicast) {
399 if (h->flags & URL_WRONLY) {
401 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
405 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
411 /* limit the tx buf size to limit latency */
412 tmp = UDP_TX_BUF_SIZE;
413 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
414 av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
418 /* set udp recv buffer size to the largest possible udp packet size to
419 * avoid losing data on OSes that set this too low by default. */
420 tmp = UDP_MAX_PKT_SIZE;
421 setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
433 static int udp_read(URLContext *h, uint8_t *buf, int size)
435 UDPContext *s = h->priv_data;
439 len = recv(s->udp_fd, buf, size, 0);
441 if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
442 ff_neterrno() != FF_NETERROR(EINTR))
451 static int udp_write(URLContext *h, uint8_t *buf, int size)
453 UDPContext *s = h->priv_data;
457 ret = sendto (s->udp_fd, buf, size, 0,
458 (struct sockaddr *) &s->dest_addr,
461 if (ff_neterrno() != FF_NETERROR(EINTR) &&
462 ff_neterrno() != FF_NETERROR(EAGAIN))
471 static int udp_close(URLContext *h)
473 UDPContext *s = h->priv_data;
475 if (s->is_multicast && !(h->flags & URL_WRONLY))
476 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
477 closesocket(s->udp_fd);
483 URLProtocol udp_protocol = {