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 "libavutil/avstring.h"
35 #include "os_support.h"
38 #include <sys/select.h>
42 #define RTP_TX_BUF_SIZE (64 * 1024)
43 #define RTP_RX_BUF_SIZE (128 * 1024)
45 typedef struct RTPContext {
46 URLContext *rtp_hd, *rtcp_hd;
51 * If no filename is given to av_open_input_file because you want to
52 * get the local port first, then you must call this function to set
53 * the remote server address.
55 * @param h media file context
56 * @param uri of the remote server
57 * @return zero if no error.
60 int rtp_set_remote_url(URLContext *h, const char *uri)
62 RTPContext *s = h->priv_data;
69 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
70 path, sizeof(path), uri);
72 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
73 udp_set_remote_url(s->rtp_hd, buf);
75 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port + 1, "%s", path);
76 udp_set_remote_url(s->rtcp_hd, buf);
82 * add option to url of the form:
83 * "http://host:port/path?option1=val1&option2=val2...
86 static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
93 av_strlcat(buf, "&", buf_size);
95 av_strlcat(buf, "?", buf_size);
96 vsnprintf(buf1, sizeof(buf1), fmt, ap);
97 av_strlcat(buf, buf1, buf_size);
101 static void build_udp_url(char *buf, int buf_size,
102 const char *hostname, int port,
103 int local_port, int ttl,
104 int max_packet_size, int connect)
106 ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
108 url_add_option(buf, buf_size, "localport=%d", local_port);
110 url_add_option(buf, buf_size, "ttl=%d", ttl);
111 if (max_packet_size >=0)
112 url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size);
114 url_add_option(buf, buf_size, "connect=1");
118 * url syntax: rtp://host:port[?option=val...]
119 * option: 'ttl=n' : set the ttl value (for multicast only)
120 * 'rtcpport=n' : set the remote rtcp port to n
121 * 'localrtpport=n' : set the local rtp port to n
122 * 'localrtcpport=n' : set the local rtcp port to n
123 * 'pkt_size=n' : set max packet size
124 * 'connect=0/1' : do a connect() on the UDP socket
126 * 'localport=n' : set the local port to n
128 * if rtcpport isn't set the rtcp port will be the rtp port + 1
129 * if local rtp port isn't set any available port will be used for the local
131 * if the local rtcp port is not set it will be the local rtp port + 1
134 static int rtp_open(URLContext *h, const char *uri, int flags)
137 int rtp_port, rtcp_port,
138 is_output, ttl, connect,
139 local_rtp_port, local_rtcp_port, max_packet_size;
145 is_output = (flags & URL_WRONLY);
147 s = av_mallocz(sizeof(RTPContext));
149 return AVERROR(ENOMEM);
152 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
153 path, sizeof(path), uri);
154 /* extract parameters */
156 rtcp_port = rtp_port+1;
158 local_rtcp_port = -1;
159 max_packet_size = -1;
162 p = strchr(uri, '?');
164 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
165 ttl = strtol(buf, NULL, 10);
167 if (find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
168 rtcp_port = strtol(buf, NULL, 10);
170 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
171 local_rtp_port = strtol(buf, NULL, 10);
173 if (find_info_tag(buf, sizeof(buf), "localrtpport", p)) {
174 local_rtp_port = strtol(buf, NULL, 10);
176 if (find_info_tag(buf, sizeof(buf), "localrtcpport", p)) {
177 local_rtcp_port = strtol(buf, NULL, 10);
179 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
180 max_packet_size = strtol(buf, NULL, 10);
182 if (find_info_tag(buf, sizeof(buf), "connect", p)) {
183 connect = strtol(buf, NULL, 10);
187 build_udp_url(buf, sizeof(buf),
188 hostname, rtp_port, local_rtp_port, ttl, max_packet_size,
190 if (url_open(&s->rtp_hd, buf, flags) < 0)
192 if (local_rtp_port>=0 && local_rtcp_port<0)
193 local_rtcp_port = udp_get_local_port(s->rtp_hd) + 1;
195 build_udp_url(buf, sizeof(buf),
196 hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size,
198 if (url_open(&s->rtcp_hd, buf, flags) < 0)
201 /* just to ease handle access. XXX: need to suppress direct handle
203 s->rtp_fd = url_get_file_handle(s->rtp_hd);
204 s->rtcp_fd = url_get_file_handle(s->rtcp_hd);
206 h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
212 url_close(s->rtp_hd);
214 url_close(s->rtcp_hd);
219 static int rtp_read(URLContext *h, uint8_t *buf, int size)
221 RTPContext *s = h->priv_data;
222 struct sockaddr_storage from;
229 from_len = sizeof(from);
230 len = recvfrom (s->rtp_fd, buf, size, 0,
231 (struct sockaddr *)&from, &from_len);
233 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
234 ff_neterrno() == FF_NETERROR(EINTR))
242 if (url_interrupt_cb())
243 return AVERROR(EINTR);
244 /* build fdset to listen to RTP and RTCP packets */
247 FD_SET(s->rtp_fd, &rfds);
248 if (s->rtcp_fd > fd_max)
250 FD_SET(s->rtcp_fd, &rfds);
252 tv.tv_usec = 100 * 1000;
253 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
256 if (FD_ISSET(s->rtcp_fd, &rfds)) {
257 from_len = sizeof(from);
258 len = recvfrom (s->rtcp_fd, buf, size, 0,
259 (struct sockaddr *)&from, &from_len);
261 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
262 ff_neterrno() == FF_NETERROR(EINTR))
269 if (FD_ISSET(s->rtp_fd, &rfds)) {
270 from_len = sizeof(from);
271 len = recvfrom (s->rtp_fd, buf, size, 0,
272 (struct sockaddr *)&from, &from_len);
274 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
275 ff_neterrno() == FF_NETERROR(EINTR))
282 if (ff_neterrno() == FF_NETERROR(EINTR))
291 static int rtp_write(URLContext *h, const uint8_t *buf, int size)
293 RTPContext *s = h->priv_data;
297 if (buf[1] >= RTCP_SR && buf[1] <= RTCP_APP) {
298 /* RTCP payload type */
301 /* RTP payload type */
305 ret = url_write(hd, buf, size);
310 ts.tv_nsec = 10 * 1000000;
311 nanosleep(&ts, NULL);
317 static int rtp_close(URLContext *h)
319 RTPContext *s = h->priv_data;
321 url_close(s->rtp_hd);
322 url_close(s->rtcp_hd);
328 * Return the local rtp port used by the RTP connection
329 * @param h media file context
330 * @return the local port number
333 int rtp_get_local_rtp_port(URLContext *h)
335 RTPContext *s = h->priv_data;
336 return udp_get_local_port(s->rtp_hd);
340 * Return the local rtcp port used by the RTP connection
341 * @param h media file context
342 * @return the local port number
345 int rtp_get_local_rtcp_port(URLContext *h)
347 RTPContext *s = h->priv_data;
348 return udp_get_local_port(s->rtcp_hd);
351 static int rtp_get_file_handle(URLContext *h)
353 RTPContext *s = h->priv_data;
357 int rtp_get_rtcp_file_handle(URLContext *h) {
358 RTPContext *s = h->priv_data;
362 URLProtocol rtp_protocol = {
369 .url_get_file_handle = rtp_get_file_handle,