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"
33 #include "os_support.h"
36 #include <sys/select.h>
39 #define RTP_TX_BUF_SIZE (64 * 1024)
40 #define RTP_RX_BUF_SIZE (128 * 1024)
42 typedef struct RTPContext {
43 URLContext *rtp_hd, *rtcp_hd;
48 * If no filename is given to av_open_input_file because you want to
49 * get the local port first, then you must call this function to set
50 * the remote server address.
52 * @param s1 media file context
53 * @param uri of the remote server
54 * @return zero if no error.
57 int rtp_set_remote_url(URLContext *h, const char *uri)
59 RTPContext *s = h->priv_data;
66 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
67 path, sizeof(path), uri);
69 snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port, path);
70 udp_set_remote_url(s->rtp_hd, buf);
72 snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port + 1, path);
73 udp_set_remote_url(s->rtcp_hd, buf);
79 * add option to url of the form:
80 * "http://host:port/path?option1=val1&option2=val2...
83 static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
90 av_strlcat(buf, "&", buf_size);
92 av_strlcat(buf, "?", buf_size);
93 vsnprintf(buf1, sizeof(buf1), fmt, ap);
94 av_strlcat(buf, buf1, buf_size);
98 static void build_udp_url(char *buf, int buf_size,
99 const char *hostname, int port,
100 int local_port, int ttl,
104 snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
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);
112 url_add_option(buf, buf_size, "contract_label=%s", label);
116 * url syntax: rtp://host:port[?option=val...]
117 * option: 'ttl=n' : set the ttl value (for multicast only)
118 * 'localport=n' : set the local port to n
119 * 'pkt_size=n' : set max packet size
123 static int rtp_open(URLContext *h, const char *uri, int flags)
126 int port, is_output, ttl, local_port, max_packet_size;
132 is_output = (flags & URL_WRONLY);
134 s = av_mallocz(sizeof(RTPContext));
136 return AVERROR(ENOMEM);
139 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
140 path, sizeof(path), uri);
141 /* extract parameters */
144 max_packet_size = -1;
146 p = strchr(uri, '?');
148 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
149 ttl = strtol(buf, NULL, 10);
151 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
152 local_port = strtol(buf, NULL, 10);
154 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
155 max_packet_size = strtol(buf, NULL, 10);
159 build_udp_url(buf, sizeof(buf),
160 hostname, port, local_port, ttl, max_packet_size, "RTP");
161 if (url_open(&s->rtp_hd, buf, flags) < 0)
163 local_port = udp_get_local_port(s->rtp_hd);
164 /* XXX: need to open another connection if the port is not even */
166 /* well, should suppress localport in path */
168 build_udp_url(buf, sizeof(buf),
169 hostname, port + 1, local_port + 1, ttl, max_packet_size, "RTCP");
170 if (url_open(&s->rtcp_hd, buf, flags) < 0)
173 /* just to ease handle access. XXX: need to suppress direct handle
175 s->rtp_fd = url_get_file_handle(s->rtp_hd);
176 s->rtcp_fd = url_get_file_handle(s->rtcp_hd);
178 h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
184 url_close(s->rtp_hd);
186 url_close(s->rtcp_hd);
191 static int rtp_read(URLContext *h, uint8_t *buf, int size)
193 RTPContext *s = h->priv_data;
194 struct sockaddr_in from;
200 from_len = sizeof(from);
201 len = recvfrom (s->rtp_fd, buf, size, 0,
202 (struct sockaddr *)&from, &from_len);
204 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
205 ff_neterrno() == FF_NETERROR(EINTR))
213 /* build fdset to listen to RTP and RTCP packets */
216 FD_SET(s->rtp_fd, &rfds);
217 if (s->rtcp_fd > fd_max)
219 FD_SET(s->rtcp_fd, &rfds);
220 n = select(fd_max + 1, &rfds, NULL, NULL, NULL);
223 if (FD_ISSET(s->rtcp_fd, &rfds)) {
224 from_len = sizeof(from);
225 len = recvfrom (s->rtcp_fd, buf, size, 0,
226 (struct sockaddr *)&from, &from_len);
228 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
229 ff_neterrno() == FF_NETERROR(EINTR))
236 if (FD_ISSET(s->rtp_fd, &rfds)) {
237 from_len = sizeof(from);
238 len = recvfrom (s->rtp_fd, buf, size, 0,
239 (struct sockaddr *)&from, &from_len);
241 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
242 ff_neterrno() == FF_NETERROR(EINTR))
254 static int rtp_write(URLContext *h, uint8_t *buf, int size)
256 RTPContext *s = h->priv_data;
260 if (buf[1] >= 200 && buf[1] <= 204) {
261 /* RTCP payload type */
264 /* RTP payload type */
268 ret = url_write(hd, buf, size);
273 ts.tv_nsec = 10 * 1000000;
274 nanosleep(&ts, NULL);
280 static int rtp_close(URLContext *h)
282 RTPContext *s = h->priv_data;
284 url_close(s->rtp_hd);
285 url_close(s->rtcp_hd);
291 * Return the local port used by the RTP connection
292 * @param s1 media file context
293 * @return the local port number
296 int rtp_get_local_port(URLContext *h)
298 RTPContext *s = h->priv_data;
299 return udp_get_local_port(s->rtp_hd);
302 #if (LIBAVFORMAT_VERSION_MAJOR <= 52)
304 * Return the rtp and rtcp file handles for select() usage to wait for
305 * several RTP streams at the same time.
306 * @param h media file context
309 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
311 RTPContext *s = h->priv_data;
313 *prtp_fd = s->rtp_fd;
314 *prtcp_fd = s->rtcp_fd;
318 static int rtp_get_file_handle(URLContext *h)
320 RTPContext *s = h->priv_data;
324 URLProtocol rtp_protocol = {
331 .url_get_file_handle = rtp_get_file_handle,