4ef655d563764eecd52207a37ac0eb3e53c7741d
[libav.git] / libavformat / rtpproto.c
1 /*
2 * RTP network protocol
3 * Copyright (c) 2002 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file libavformat/rtpproto.c
24 * RTP protocol
25 */
26
27 #include "libavutil/avstring.h"
28 #include "avformat.h"
29 #include "rtpdec.h"
30
31 #include <unistd.h>
32 #include <stdarg.h>
33 #include "internal.h"
34 #include "network.h"
35 #include "os_support.h"
36 #include <fcntl.h>
37 #if HAVE_SYS_SELECT_H
38 #include <sys/select.h>
39 #endif
40 #include <sys/time.h>
41
42 #define RTP_TX_BUF_SIZE (64 * 1024)
43 #define RTP_RX_BUF_SIZE (128 * 1024)
44
45 typedef struct RTPContext {
46 URLContext *rtp_hd, *rtcp_hd;
47 int rtp_fd, rtcp_fd;
48 } RTPContext;
49
50 /**
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.
54 *
55 * @param s1 media file context
56 * @param uri of the remote server
57 * @return zero if no error.
58 */
59
60 int rtp_set_remote_url(URLContext *h, const char *uri)
61 {
62 RTPContext *s = h->priv_data;
63 char hostname[256];
64 int port;
65
66 char buf[1024];
67 char path[1024];
68
69 ff_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
70 path, sizeof(path), uri);
71
72 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
73 udp_set_remote_url(s->rtp_hd, buf);
74
75 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port + 1, "%s", path);
76 udp_set_remote_url(s->rtcp_hd, buf);
77 return 0;
78 }
79
80
81 /**
82 * add option to url of the form:
83 * "http://host:port/path?option1=val1&option2=val2...
84 */
85
86 static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
87 {
88 char buf1[1024];
89 va_list ap;
90
91 va_start(ap, fmt);
92 if (strchr(buf, '?'))
93 av_strlcat(buf, "&", buf_size);
94 else
95 av_strlcat(buf, "?", buf_size);
96 vsnprintf(buf1, sizeof(buf1), fmt, ap);
97 av_strlcat(buf, buf1, buf_size);
98 va_end(ap);
99 }
100
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)
105 {
106 ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
107 if (local_port >= 0)
108 url_add_option(buf, buf_size, "localport=%d", local_port);
109 if (ttl >= 0)
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);
113 }
114
115 /**
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
120 *
121 */
122
123 static int rtp_open(URLContext *h, const char *uri, int flags)
124 {
125 RTPContext *s;
126 int port, is_output, ttl, local_port, max_packet_size;
127 char hostname[256];
128 char buf[1024];
129 char path[1024];
130 const char *p;
131
132 is_output = (flags & URL_WRONLY);
133
134 s = av_mallocz(sizeof(RTPContext));
135 if (!s)
136 return AVERROR(ENOMEM);
137 h->priv_data = s;
138
139 ff_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
140 path, sizeof(path), uri);
141 /* extract parameters */
142 ttl = -1;
143 local_port = -1;
144 max_packet_size = -1;
145
146 p = strchr(uri, '?');
147 if (p) {
148 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
149 ttl = strtol(buf, NULL, 10);
150 }
151 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
152 local_port = strtol(buf, NULL, 10);
153 }
154 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
155 max_packet_size = strtol(buf, NULL, 10);
156 }
157 }
158
159 build_udp_url(buf, sizeof(buf),
160 hostname, port, local_port, ttl, max_packet_size);
161 if (url_open(&s->rtp_hd, buf, flags) < 0)
162 goto fail;
163 local_port = udp_get_local_port(s->rtp_hd);
164 /* XXX: need to open another connection if the port is not even */
165
166 /* well, should suppress localport in path */
167
168 build_udp_url(buf, sizeof(buf),
169 hostname, port + 1, local_port + 1, ttl, max_packet_size);
170 if (url_open(&s->rtcp_hd, buf, flags) < 0)
171 goto fail;
172
173 /* just to ease handle access. XXX: need to suppress direct handle
174 access */
175 s->rtp_fd = url_get_file_handle(s->rtp_hd);
176 s->rtcp_fd = url_get_file_handle(s->rtcp_hd);
177
178 h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
179 h->is_streamed = 1;
180 return 0;
181
182 fail:
183 if (s->rtp_hd)
184 url_close(s->rtp_hd);
185 if (s->rtcp_hd)
186 url_close(s->rtcp_hd);
187 av_free(s);
188 return AVERROR(EIO);
189 }
190
191 static int rtp_read(URLContext *h, uint8_t *buf, int size)
192 {
193 RTPContext *s = h->priv_data;
194 struct sockaddr_in from;
195 socklen_t from_len;
196 int len, fd_max, n;
197 fd_set rfds;
198 struct timeval tv;
199 #if 0
200 for(;;) {
201 from_len = sizeof(from);
202 len = recvfrom (s->rtp_fd, buf, size, 0,
203 (struct sockaddr *)&from, &from_len);
204 if (len < 0) {
205 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
206 ff_neterrno() == FF_NETERROR(EINTR))
207 continue;
208 return AVERROR(EIO);
209 }
210 break;
211 }
212 #else
213 for(;;) {
214 if (url_interrupt_cb())
215 return AVERROR(EINTR);
216 /* build fdset to listen to RTP and RTCP packets */
217 FD_ZERO(&rfds);
218 fd_max = s->rtp_fd;
219 FD_SET(s->rtp_fd, &rfds);
220 if (s->rtcp_fd > fd_max)
221 fd_max = s->rtcp_fd;
222 FD_SET(s->rtcp_fd, &rfds);
223 tv.tv_sec = 0;
224 tv.tv_usec = 100 * 1000;
225 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
226 if (n > 0) {
227 /* first try RTCP */
228 if (FD_ISSET(s->rtcp_fd, &rfds)) {
229 from_len = sizeof(from);
230 len = recvfrom (s->rtcp_fd, buf, size, 0,
231 (struct sockaddr *)&from, &from_len);
232 if (len < 0) {
233 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
234 ff_neterrno() == FF_NETERROR(EINTR))
235 continue;
236 return AVERROR(EIO);
237 }
238 break;
239 }
240 /* then RTP */
241 if (FD_ISSET(s->rtp_fd, &rfds)) {
242 from_len = sizeof(from);
243 len = recvfrom (s->rtp_fd, buf, size, 0,
244 (struct sockaddr *)&from, &from_len);
245 if (len < 0) {
246 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
247 ff_neterrno() == FF_NETERROR(EINTR))
248 continue;
249 return AVERROR(EIO);
250 }
251 break;
252 }
253 } else if (n < 0) {
254 if (ff_neterrno() == FF_NETERROR(EINTR))
255 continue;
256 return AVERROR(EIO);
257 }
258 }
259 #endif
260 return len;
261 }
262
263 static int rtp_write(URLContext *h, uint8_t *buf, int size)
264 {
265 RTPContext *s = h->priv_data;
266 int ret;
267 URLContext *hd;
268
269 if (buf[1] >= 200 && buf[1] <= 204) {
270 /* RTCP payload type */
271 hd = s->rtcp_hd;
272 } else {
273 /* RTP payload type */
274 hd = s->rtp_hd;
275 }
276
277 ret = url_write(hd, buf, size);
278 #if 0
279 {
280 struct timespec ts;
281 ts.tv_sec = 0;
282 ts.tv_nsec = 10 * 1000000;
283 nanosleep(&ts, NULL);
284 }
285 #endif
286 return ret;
287 }
288
289 static int rtp_close(URLContext *h)
290 {
291 RTPContext *s = h->priv_data;
292
293 url_close(s->rtp_hd);
294 url_close(s->rtcp_hd);
295 av_free(s);
296 return 0;
297 }
298
299 /**
300 * Return the local port used by the RTP connection
301 * @param s1 media file context
302 * @return the local port number
303 */
304
305 int rtp_get_local_port(URLContext *h)
306 {
307 RTPContext *s = h->priv_data;
308 return udp_get_local_port(s->rtp_hd);
309 }
310
311 #if (LIBAVFORMAT_VERSION_MAJOR <= 52)
312 /**
313 * Return the rtp and rtcp file handles for select() usage to wait for
314 * several RTP streams at the same time.
315 * @param h media file context
316 */
317
318 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
319 {
320 RTPContext *s = h->priv_data;
321
322 *prtp_fd = s->rtp_fd;
323 *prtcp_fd = s->rtcp_fd;
324 }
325 #endif
326
327 static int rtp_get_file_handle(URLContext *h)
328 {
329 RTPContext *s = h->priv_data;
330 return s->rtp_fd;
331 }
332
333 URLProtocol rtp_protocol = {
334 "rtp",
335 rtp_open,
336 rtp_read,
337 rtp_write,
338 NULL, /* seek */
339 rtp_close,
340 .url_get_file_handle = rtp_get_file_handle,
341 };