2 * UDP prototype streaming system
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <sys/types.h>
22 #include <sys/socket.h>
23 #include <netinet/in.h>
25 # include <arpa/inet.h>
27 # include "barpainet.h"
37 struct sockaddr_in dest_addr;
40 #define UDP_TX_BUF_SIZE 32768
43 * If no filename is given to av_open_input_file because you want to
44 * get the local port first, then you must call this function to set
45 * the remote server address.
47 * url syntax: udp://host:port[?option=val...]
48 * option: 'multicast=1' : enable multicast
49 * 'ttl=n' : set the ttl value (for multicast only)
50 * 'localport=n' : set the local port
51 * 'pkt_size=n' : set max packet size
53 * @param s1 media file context
54 * @param uri of the remote server
55 * @return zero if no error.
57 int udp_set_remote_url(URLContext *h, const char *uri)
59 UDPContext *s = h->priv_data;
63 url_split(NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
65 /* set the destination address */
66 if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
68 s->dest_addr.sin_family = AF_INET;
69 s->dest_addr.sin_port = htons(port);
74 * Return the local port used by the UDP connexion
75 * @param s1 media file context
76 * @return the local port number
78 int udp_get_local_port(URLContext *h)
80 UDPContext *s = h->priv_data;
85 * Return the udp file handle for select() usage to wait for several RTP
86 * streams at the same time.
87 * @param h media file context
89 int udp_get_file_handle(URLContext *h)
91 UDPContext *s = h->priv_data;
95 /* put it in UDP context */
96 /* return non zero if error */
97 static int udp_open(URLContext *h, const char *uri, int flags)
99 struct sockaddr_in my_addr, my_addr1;
101 int port, udp_fd = -1, tmp;
102 UDPContext *s = NULL;
108 h->max_packet_size = 1472;
110 is_output = (flags & URL_WRONLY);
112 s = av_malloc(sizeof(UDPContext));
120 p = strchr(uri, '?');
122 s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
123 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
124 s->ttl = strtol(buf, NULL, 10);
126 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
127 s->local_port = strtol(buf, NULL, 10);
129 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
130 h->max_packet_size = strtol(buf, NULL, 10);
134 /* fill the dest addr */
135 url_split(NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
137 /* XXX: fix url_split */
138 if (hostname[0] == '\0' || hostname[0] == '?') {
139 /* only accepts null hostname if input */
140 if (s->is_multicast || (flags & URL_WRONLY))
143 udp_set_remote_url(h, uri);
146 udp_fd = socket(PF_INET, SOCK_DGRAM, 0);
150 my_addr.sin_family = AF_INET;
151 my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
152 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
153 /* special case: the bind must be done on the multicast address port */
154 my_addr.sin_port = s->dest_addr.sin_port;
156 my_addr.sin_port = htons(s->local_port);
159 /* the bind is needed to give a port to the socket now */
160 if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
163 len = sizeof(my_addr1);
164 getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
165 s->local_port = ntohs(my_addr1.sin_port);
167 #ifndef CONFIG_BEOS_NETSERVER
168 if (s->is_multicast) {
169 if (h->flags & URL_WRONLY) {
171 if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
172 &s->ttl, sizeof(s->ttl)) < 0) {
173 perror("IP_MULTICAST_TTL");
178 memset(&s->mreq, 0, sizeof(s->mreq));
179 s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
180 s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
181 if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
182 &s->mreq, sizeof(s->mreq)) < 0) {
183 perror("rtp: IP_ADD_MEMBERSHIP");
191 /* limit the tx buf size to limit latency */
192 tmp = UDP_TX_BUF_SIZE;
193 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
194 perror("setsockopt sndbuf");
203 #ifdef CONFIG_BEOS_NETSERVER
212 static int udp_read(URLContext *h, uint8_t *buf, int size)
214 UDPContext *s = h->priv_data;
215 struct sockaddr_in from;
219 from_len = sizeof(from);
220 len = recvfrom (s->udp_fd, buf, size, 0,
221 (struct sockaddr *)&from, &from_len);
223 if (errno != EAGAIN && errno != EINTR)
232 static int udp_write(URLContext *h, uint8_t *buf, int size)
234 UDPContext *s = h->priv_data;
238 ret = sendto (s->udp_fd, buf, size, 0,
239 (struct sockaddr *) &s->dest_addr,
240 sizeof (s->dest_addr));
242 if (errno != EINTR && errno != EAGAIN)
251 static int udp_close(URLContext *h)
253 UDPContext *s = h->priv_data;
255 #ifndef CONFIG_BEOS_NETSERVER
256 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
257 if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
258 &s->mreq, sizeof(s->mreq)) < 0) {
259 perror("IP_DROP_MEMBERSHIP");
264 closesocket(s->udp_fd);
270 URLProtocol udp_protocol = {