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 */
31 #include "os_support.h"
33 #ifndef IPV6_ADD_MEMBERSHIP
34 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
35 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
38 #define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
40 #ifndef IN6_IS_ADDR_MULTICAST
41 #define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
51 struct sockaddr_in dest_addr;
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, struct sockaddr *addr) {
62 #ifdef IP_MULTICAST_TTL
63 if (addr->sa_family == AF_INET) {
64 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
65 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
71 if (addr->sa_family == AF_INET6) {
72 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
73 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
81 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr) {
82 #ifdef IP_ADD_MEMBERSHIP
83 if (addr->sa_family == AF_INET) {
86 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
87 mreq.imr_interface.s_addr= INADDR_ANY;
88 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
89 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
95 if (addr->sa_family == AF_INET6) {
96 struct ipv6_mreq mreq6;
98 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
99 mreq6.ipv6mr_interface= 0;
100 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
101 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
109 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr) {
110 #ifdef IP_DROP_MEMBERSHIP
111 if (addr->sa_family == AF_INET) {
114 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
115 mreq.imr_interface.s_addr= INADDR_ANY;
116 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
117 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
123 if (addr->sa_family == AF_INET6) {
124 struct ipv6_mreq mreq6;
126 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
127 mreq6.ipv6mr_interface= 0;
128 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
129 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
138 static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
139 struct addrinfo hints, *res = 0;
142 const char *node = 0, *service = "0";
145 snprintf(sport, sizeof(sport), "%d", port);
148 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
151 memset(&hints, 0, sizeof(hints));
152 hints.ai_socktype = type;
153 hints.ai_family = family;
154 hints.ai_flags = flags;
155 if ((error = getaddrinfo(node, service, &hints, &res))) {
156 av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
162 static int udp_set_url(struct sockaddr_storage *addr, const char *hostname, int port) {
163 struct addrinfo *res0;
166 res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
167 if (res0 == 0) return AVERROR(EIO);
168 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
169 addr_len = res0->ai_addrlen;
175 static int is_multicast_address(struct sockaddr_storage *addr)
177 if (addr->ss_family == AF_INET) {
178 return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
180 if (addr->ss_family == AF_INET6) {
181 return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
187 static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, int *addr_len)
190 struct addrinfo *res0 = NULL, *res = NULL;
191 int family = AF_UNSPEC;
193 if (((struct sockaddr *) &s->dest_addr)->sa_family)
194 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
195 res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
198 for (res = res0; res; res=res->ai_next) {
199 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
200 if (udp_fd > 0) break;
201 av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
207 memcpy(addr, res->ai_addr, res->ai_addrlen);
208 *addr_len = res->ai_addrlen;
222 static int udp_port(struct sockaddr_storage *addr, int addr_len)
224 char sbuf[sizeof(int)*3+1];
226 if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
227 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
231 return strtol(sbuf, NULL, 10);
236 static int udp_set_url(struct sockaddr_in *addr, const char *hostname, int port)
238 /* set the destination address */
239 if (resolve_host(&addr->sin_addr, hostname) < 0)
241 addr->sin_family = AF_INET;
242 addr->sin_port = htons(port);
244 return sizeof(struct sockaddr_in);
247 static int is_multicast_address(struct sockaddr_in *addr)
249 return IN_MULTICAST(ntohl(addr->sin_addr.s_addr));
252 static int udp_socket_create(UDPContext *s, struct sockaddr_in *addr, int *addr_len)
256 fd = socket(AF_INET, SOCK_DGRAM, 0);
260 addr->sin_family = AF_INET;
261 addr->sin_addr.s_addr = htonl (INADDR_ANY);
262 addr->sin_port = htons(s->local_port);
263 *addr_len = sizeof(struct sockaddr_in);
268 static int udp_port(struct sockaddr_in *addr, int len)
270 return ntohs(addr->sin_port);
272 #endif /* CONFIG_IPV6 */
276 * If no filename is given to av_open_input_file because you want to
277 * get the local port first, then you must call this function to set
278 * the remote server address.
280 * url syntax: udp://host:port[?option=val...]
281 * option: 'ttl=n' : set the ttl value (for multicast only)
282 * 'localport=n' : set the local port
283 * 'pkt_size=n' : set max packet size
284 * 'reuse=1' : enable reusing the socket
286 * @param s1 media file context
287 * @param uri of the remote server
288 * @return zero if no error.
290 int udp_set_remote_url(URLContext *h, const char *uri)
292 UDPContext *s = h->priv_data;
296 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
298 /* set the destination address */
299 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
300 if (s->dest_addr_len < 0) {
303 s->is_multicast = is_multicast_address(&s->dest_addr);
309 * Return the local port used by the UDP connexion
310 * @param s1 media file context
311 * @return the local port number
313 int udp_get_local_port(URLContext *h)
315 UDPContext *s = h->priv_data;
316 return s->local_port;
320 * Return the udp file handle for select() usage to wait for several RTP
321 * streams at the same time.
322 * @param h media file context
324 int udp_get_file_handle(URLContext *h)
326 UDPContext *s = h->priv_data;
330 /* put it in UDP context */
331 /* return non zero if error */
332 static int udp_open(URLContext *h, const char *uri, int flags)
335 int port, udp_fd = -1, tmp;
336 UDPContext *s = NULL;
341 struct sockaddr_in my_addr;
343 struct sockaddr_storage my_addr;
348 h->max_packet_size = 1472;
350 is_output = (flags & URL_WRONLY);
352 if(!ff_network_init())
355 s = av_mallocz(sizeof(UDPContext));
357 return AVERROR(ENOMEM);
361 p = strchr(uri, '?');
363 s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
364 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
365 s->ttl = strtol(buf, NULL, 10);
367 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
368 s->local_port = strtol(buf, NULL, 10);
370 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
371 h->max_packet_size = strtol(buf, NULL, 10);
375 /* fill the dest addr */
376 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
378 /* XXX: fix url_split */
379 if (hostname[0] == '\0' || hostname[0] == '?') {
380 /* only accepts null hostname if input */
381 if (flags & URL_WRONLY)
384 udp_set_remote_url(h, uri);
387 if (s->is_multicast && !(h->flags & URL_WRONLY))
388 s->local_port = port;
389 udp_fd = udp_socket_create(s, &my_addr, &len);
394 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
397 /* the bind is needed to give a port to the socket now */
398 if (bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
401 len = sizeof(my_addr);
402 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
403 s->local_port = udp_port(&my_addr, len);
405 if (s->is_multicast) {
406 if (h->flags & URL_WRONLY) {
408 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
412 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
418 /* limit the tx buf size to limit latency */
419 tmp = UDP_TX_BUF_SIZE;
420 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
421 av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
425 /* set udp recv buffer size to the largest possible udp packet size to
426 * avoid losing data on OSes that set this too low by default. */
427 tmp = UDP_MAX_PKT_SIZE;
428 setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
440 static int udp_read(URLContext *h, uint8_t *buf, int size)
442 UDPContext *s = h->priv_data;
446 len = recv(s->udp_fd, buf, size, 0);
448 if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
449 ff_neterrno() != FF_NETERROR(EINTR))
458 static int udp_write(URLContext *h, uint8_t *buf, int size)
460 UDPContext *s = h->priv_data;
464 ret = sendto (s->udp_fd, buf, size, 0,
465 (struct sockaddr *) &s->dest_addr,
468 if (ff_neterrno() != FF_NETERROR(EINTR) &&
469 ff_neterrno() != FF_NETERROR(EAGAIN))
478 static int udp_close(URLContext *h)
480 UDPContext *s = h->priv_data;
482 if (s->is_multicast && !(h->flags & URL_WRONLY))
483 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
484 closesocket(s->udp_fd);
490 URLProtocol udp_protocol = {