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
27 #include "os_support.h"
30 #define RTP_TX_BUF_SIZE (64 * 1024)
31 #define RTP_RX_BUF_SIZE (128 * 1024)
33 typedef struct RTPContext {
34 URLContext *rtp_hd, *rtcp_hd;
39 * If no filename is given to av_open_input_file because you want to
40 * get the local port first, then you must call this function to set
41 * the remote server address.
43 * @param s1 media file context
44 * @param uri of the remote server
45 * @return zero if no error.
47 int rtp_set_remote_url(URLContext *h, const char *uri)
49 RTPContext *s = h->priv_data;
56 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
57 path, sizeof(path), uri);
59 snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port, path);
60 udp_set_remote_url(s->rtp_hd, buf);
62 snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port + 1, path);
63 udp_set_remote_url(s->rtcp_hd, buf);
68 /* add option to url of the form:
69 "http://host:port/path?option1=val1&option2=val2... */
70 static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
77 av_strlcat(buf, "&", buf_size);
79 av_strlcat(buf, "?", buf_size);
80 vsnprintf(buf1, sizeof(buf1), fmt, ap);
81 av_strlcat(buf, buf1, buf_size);
85 static void build_udp_url(char *buf, int buf_size,
86 const char *hostname, int port,
87 int local_port, int multicast, int ttl)
89 snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
91 url_add_option(buf, buf_size, "localport=%d", local_port);
93 url_add_option(buf, buf_size, "multicast=1");
95 url_add_option(buf, buf_size, "ttl=%d", ttl);
99 * url syntax: rtp://host:port[?option=val...]
100 * option: 'multicast=1' : enable multicast
101 * 'ttl=n' : set the ttl value (for multicast only)
102 * 'localport=n' : set the local port to n
105 static int rtp_open(URLContext *h, const char *uri, int flags)
108 int port, is_output, is_multicast, ttl, local_port;
114 is_output = (flags & URL_WRONLY);
116 s = av_mallocz(sizeof(RTPContext));
118 return AVERROR(ENOMEM);
121 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
122 path, sizeof(path), uri);
123 /* extract parameters */
127 p = strchr(uri, '?');
129 is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
130 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
131 ttl = strtol(buf, NULL, 10);
133 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
134 local_port = strtol(buf, NULL, 10);
138 build_udp_url(buf, sizeof(buf),
139 hostname, port, local_port, is_multicast, ttl);
140 if (url_open(&s->rtp_hd, buf, flags) < 0)
142 local_port = udp_get_local_port(s->rtp_hd);
143 /* XXX: need to open another connection if the port is not even */
145 /* well, should suppress localport in path */
147 build_udp_url(buf, sizeof(buf),
148 hostname, port + 1, local_port + 1, is_multicast, ttl);
149 if (url_open(&s->rtcp_hd, buf, flags) < 0)
152 /* just to ease handle access. XXX: need to suppress direct handle
154 s->rtp_fd = udp_get_file_handle(s->rtp_hd);
155 s->rtcp_fd = udp_get_file_handle(s->rtcp_hd);
157 h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
163 url_close(s->rtp_hd);
165 url_close(s->rtcp_hd);
170 static int rtp_read(URLContext *h, uint8_t *buf, int size)
172 RTPContext *s = h->priv_data;
173 struct sockaddr_in from;
179 from_len = sizeof(from);
180 len = recvfrom (s->rtp_fd, buf, size, 0,
181 (struct sockaddr *)&from, &from_len);
183 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
184 ff_neterrno() == FF_NETERROR(EINTR))
192 /* build fdset to listen to RTP and RTCP packets */
195 FD_SET(s->rtp_fd, &rfds);
196 if (s->rtcp_fd > fd_max)
198 FD_SET(s->rtcp_fd, &rfds);
199 n = select(fd_max + 1, &rfds, NULL, NULL, NULL);
202 if (FD_ISSET(s->rtcp_fd, &rfds)) {
203 from_len = sizeof(from);
204 len = recvfrom (s->rtcp_fd, buf, size, 0,
205 (struct sockaddr *)&from, &from_len);
207 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
208 ff_neterrno() == FF_NETERROR(EINTR))
215 if (FD_ISSET(s->rtp_fd, &rfds)) {
216 from_len = sizeof(from);
217 len = recvfrom (s->rtp_fd, buf, size, 0,
218 (struct sockaddr *)&from, &from_len);
220 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
221 ff_neterrno() == FF_NETERROR(EINTR))
233 static int rtp_write(URLContext *h, uint8_t *buf, int size)
235 RTPContext *s = h->priv_data;
239 if (buf[1] >= 200 && buf[1] <= 204) {
240 /* RTCP payload type */
243 /* RTP payload type */
247 ret = url_write(hd, buf, size);
252 ts.tv_nsec = 10 * 1000000;
253 nanosleep(&ts, NULL);
259 static int rtp_close(URLContext *h)
261 RTPContext *s = h->priv_data;
263 url_close(s->rtp_hd);
264 url_close(s->rtcp_hd);
270 * Return the local port used by the RTP connection
271 * @param s1 media file context
272 * @return the local port number
274 int rtp_get_local_port(URLContext *h)
276 RTPContext *s = h->priv_data;
277 return udp_get_local_port(s->rtp_hd);
281 * Return the rtp and rtcp file handles for select() usage to wait for several RTP
282 * streams at the same time.
283 * @param h media file context
285 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
287 RTPContext *s = h->priv_data;
289 *prtp_fd = s->rtp_fd;
290 *prtcp_fd = s->rtcp_fd;
293 URLProtocol rtp_protocol = {