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
23 * @file libavformat/rtpproto.c
27 #include "libavutil/avstring.h"
34 #include "os_support.h"
37 #include <sys/select.h>
40 #define RTP_TX_BUF_SIZE (64 * 1024)
41 #define RTP_RX_BUF_SIZE (128 * 1024)
43 typedef struct RTPContext {
44 URLContext *rtp_hd, *rtcp_hd;
49 * If no filename is given to av_open_input_file because you want to
50 * get the local port first, then you must call this function to set
51 * the remote server address.
53 * @param s1 media file context
54 * @param uri of the remote server
55 * @return zero if no error.
58 int rtp_set_remote_url(URLContext *h, const char *uri)
60 RTPContext *s = h->priv_data;
67 ff_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
68 path, sizeof(path), uri);
70 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
71 udp_set_remote_url(s->rtp_hd, buf);
73 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port + 1, "%s", path);
74 udp_set_remote_url(s->rtcp_hd, buf);
80 * add option to url of the form:
81 * "http://host:port/path?option1=val1&option2=val2...
84 static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
91 av_strlcat(buf, "&", buf_size);
93 av_strlcat(buf, "?", buf_size);
94 vsnprintf(buf1, sizeof(buf1), fmt, ap);
95 av_strlcat(buf, buf1, buf_size);
99 static void build_udp_url(char *buf, int buf_size,
100 const char *hostname, int port,
101 int local_port, int ttl,
104 ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
106 url_add_option(buf, buf_size, "localport=%d", local_port);
108 url_add_option(buf, buf_size, "ttl=%d", ttl);
109 if (max_packet_size >=0)
110 url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size);
114 * url syntax: rtp://host:port[?option=val...]
115 * option: 'ttl=n' : set the ttl value (for multicast only)
116 * 'localport=n' : set the local port to n
117 * 'pkt_size=n' : set max packet size
121 static int rtp_open(URLContext *h, const char *uri, int flags)
124 int port, is_output, ttl, local_port, max_packet_size;
130 is_output = (flags & URL_WRONLY);
132 s = av_mallocz(sizeof(RTPContext));
134 return AVERROR(ENOMEM);
137 ff_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
138 path, sizeof(path), uri);
139 /* extract parameters */
142 max_packet_size = -1;
144 p = strchr(uri, '?');
146 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
147 ttl = strtol(buf, NULL, 10);
149 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
150 local_port = strtol(buf, NULL, 10);
152 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
153 max_packet_size = strtol(buf, NULL, 10);
157 build_udp_url(buf, sizeof(buf),
158 hostname, port, local_port, ttl, max_packet_size);
159 if (url_open(&s->rtp_hd, buf, flags) < 0)
161 local_port = udp_get_local_port(s->rtp_hd);
162 /* XXX: need to open another connection if the port is not even */
164 /* well, should suppress localport in path */
166 build_udp_url(buf, sizeof(buf),
167 hostname, port + 1, local_port + 1, ttl, max_packet_size);
168 if (url_open(&s->rtcp_hd, buf, flags) < 0)
171 /* just to ease handle access. XXX: need to suppress direct handle
173 s->rtp_fd = url_get_file_handle(s->rtp_hd);
174 s->rtcp_fd = url_get_file_handle(s->rtcp_hd);
176 h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
182 url_close(s->rtp_hd);
184 url_close(s->rtcp_hd);
189 static int rtp_read(URLContext *h, uint8_t *buf, int size)
191 RTPContext *s = h->priv_data;
192 struct sockaddr_in from;
199 from_len = sizeof(from);
200 len = recvfrom (s->rtp_fd, buf, size, 0,
201 (struct sockaddr *)&from, &from_len);
203 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
204 ff_neterrno() == FF_NETERROR(EINTR))
212 if (url_interrupt_cb())
213 return AVERROR(EINTR);
214 /* build fdset to listen to RTP and RTCP packets */
217 FD_SET(s->rtp_fd, &rfds);
218 if (s->rtcp_fd > fd_max)
220 FD_SET(s->rtcp_fd, &rfds);
222 tv.tv_usec = 100 * 1000;
223 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
226 if (FD_ISSET(s->rtcp_fd, &rfds)) {
227 from_len = sizeof(from);
228 len = recvfrom (s->rtcp_fd, buf, size, 0,
229 (struct sockaddr *)&from, &from_len);
231 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
232 ff_neterrno() == FF_NETERROR(EINTR))
239 if (FD_ISSET(s->rtp_fd, &rfds)) {
240 from_len = sizeof(from);
241 len = recvfrom (s->rtp_fd, buf, size, 0,
242 (struct sockaddr *)&from, &from_len);
244 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
245 ff_neterrno() == FF_NETERROR(EINTR))
259 static int rtp_write(URLContext *h, uint8_t *buf, int size)
261 RTPContext *s = h->priv_data;
265 if (buf[1] >= 200 && buf[1] <= 204) {
266 /* RTCP payload type */
269 /* RTP payload type */
273 ret = url_write(hd, buf, size);
278 ts.tv_nsec = 10 * 1000000;
279 nanosleep(&ts, NULL);
285 static int rtp_close(URLContext *h)
287 RTPContext *s = h->priv_data;
289 url_close(s->rtp_hd);
290 url_close(s->rtcp_hd);
296 * Return the local port used by the RTP connection
297 * @param s1 media file context
298 * @return the local port number
301 int rtp_get_local_port(URLContext *h)
303 RTPContext *s = h->priv_data;
304 return udp_get_local_port(s->rtp_hd);
307 #if (LIBAVFORMAT_VERSION_MAJOR <= 52)
309 * Return the rtp and rtcp file handles for select() usage to wait for
310 * several RTP streams at the same time.
311 * @param h media file context
314 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
316 RTPContext *s = h->priv_data;
318 *prtp_fd = s->rtp_fd;
319 *prtcp_fd = s->rtcp_fd;
323 static int rtp_get_file_handle(URLContext *h)
325 RTPContext *s = h->priv_data;
329 URLProtocol rtp_protocol = {
336 .url_get_file_handle = rtp_get_file_handle,