3 * Copyright (c) 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
28 #define RTP_TX_BUF_SIZE (64 * 1024)
29 #define RTP_RX_BUF_SIZE (128 * 1024)
31 typedef struct RTPContext {
32 URLContext *rtp_hd, *rtcp_hd;
37 * If no filename is given to av_open_input_file because you want to
38 * get the local port first, then you must call this function to set
39 * the remote server address.
41 * @param s1 media file context
42 * @param uri of the remote server
43 * @return zero if no error.
45 int rtp_set_remote_url(URLContext *h, const char *uri)
47 RTPContext *s = h->priv_data;
54 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
55 path, sizeof(path), uri);
57 snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port, path);
58 udp_set_remote_url(s->rtp_hd, buf);
60 snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port + 1, path);
61 udp_set_remote_url(s->rtcp_hd, buf);
66 /* add option to url of the form:
67 "http://host:port/path?option1=val1&option2=val2... */
68 static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
75 pstrcat(buf, buf_size, "&");
77 pstrcat(buf, buf_size, "?");
78 vsnprintf(buf1, sizeof(buf1), fmt, ap);
79 pstrcat(buf, buf_size, buf1);
83 static void build_udp_url(char *buf, int buf_size,
84 const char *hostname, int port,
85 int local_port, int multicast, int ttl)
87 snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
89 url_add_option(buf, buf_size, "localport=%d", local_port);
91 url_add_option(buf, buf_size, "multicast=1");
93 url_add_option(buf, buf_size, "ttl=%d", ttl);
97 * url syntax: rtp://host:port[?option=val...]
98 * option: 'multicast=1' : enable multicast
99 * 'ttl=n' : set the ttl value (for multicast only)
100 * 'localport=n' : set the local port to n
103 static int rtp_open(URLContext *h, const char *uri, int flags)
106 int port, is_output, is_multicast, ttl, local_port;
112 is_output = (flags & URL_WRONLY);
114 s = av_mallocz(sizeof(RTPContext));
116 return AVERROR(ENOMEM);
119 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
120 path, sizeof(path), uri);
121 /* extract parameters */
125 p = strchr(uri, '?');
127 is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
128 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
129 ttl = strtol(buf, NULL, 10);
131 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
132 local_port = strtol(buf, NULL, 10);
136 build_udp_url(buf, sizeof(buf),
137 hostname, port, local_port, is_multicast, ttl);
138 if (url_open(&s->rtp_hd, buf, flags) < 0)
140 local_port = udp_get_local_port(s->rtp_hd);
141 /* XXX: need to open another connection if the port is not even */
143 /* well, should suppress localport in path */
145 build_udp_url(buf, sizeof(buf),
146 hostname, port + 1, local_port + 1, is_multicast, ttl);
147 if (url_open(&s->rtcp_hd, buf, flags) < 0)
150 /* just to ease handle access. XXX: need to suppress direct handle
152 s->rtp_fd = udp_get_file_handle(s->rtp_hd);
153 s->rtcp_fd = udp_get_file_handle(s->rtcp_hd);
155 h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
161 url_close(s->rtp_hd);
163 url_close(s->rtcp_hd);
168 static int rtp_read(URLContext *h, uint8_t *buf, int size)
170 RTPContext *s = h->priv_data;
171 struct sockaddr_in from;
177 from_len = sizeof(from);
178 len = recvfrom (s->rtp_fd, buf, size, 0,
179 (struct sockaddr *)&from, &from_len);
181 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
182 ff_neterrno() == FF_NETERROR(EINTR))
190 /* build fdset to listen to RTP and RTCP packets */
193 FD_SET(s->rtp_fd, &rfds);
194 if (s->rtcp_fd > fd_max)
196 FD_SET(s->rtcp_fd, &rfds);
197 n = select(fd_max + 1, &rfds, NULL, NULL, NULL);
200 if (FD_ISSET(s->rtcp_fd, &rfds)) {
201 from_len = sizeof(from);
202 len = recvfrom (s->rtcp_fd, buf, size, 0,
203 (struct sockaddr *)&from, &from_len);
205 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
206 ff_neterrno() == FF_NETERROR(EINTR))
213 if (FD_ISSET(s->rtp_fd, &rfds)) {
214 from_len = sizeof(from);
215 len = recvfrom (s->rtp_fd, buf, size, 0,
216 (struct sockaddr *)&from, &from_len);
218 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
219 ff_neterrno() == FF_NETERROR(EINTR))
231 static int rtp_write(URLContext *h, uint8_t *buf, int size)
233 RTPContext *s = h->priv_data;
237 if (buf[1] >= 200 && buf[1] <= 204) {
238 /* RTCP payload type */
241 /* RTP payload type */
245 ret = url_write(hd, buf, size);
250 ts.tv_nsec = 10 * 1000000;
251 nanosleep(&ts, NULL);
257 static int rtp_close(URLContext *h)
259 RTPContext *s = h->priv_data;
261 url_close(s->rtp_hd);
262 url_close(s->rtcp_hd);
268 * Return the local port used by the RTP connection
269 * @param s1 media file context
270 * @return the local port number
272 int rtp_get_local_port(URLContext *h)
274 RTPContext *s = h->priv_data;
275 return udp_get_local_port(s->rtp_hd);
279 * Return the rtp and rtcp file handles for select() usage to wait for several RTP
280 * streams at the same time.
281 * @param h media file context
283 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
285 RTPContext *s = h->priv_data;
287 *prtp_fd = s->rtp_fd;
288 *prtcp_fd = s->rtcp_fd;
291 URLProtocol rtp_protocol = {