Add rtp_get_rtcp_file_handle function
[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
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 h 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 av_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 * 'rtcpport=n' : set the remote rtcp port to n
119 * 'localrtpport=n' : set the local rtp port to n
120 * 'localrtcpport=n' : set the local rtcp port to n
121 * 'pkt_size=n' : set max packet size
122 * deprecated option:
123 * 'localport=n' : set the local port to n
124 *
125 * if rtcpport isn't set the rtcp port will be the rtp port + 1
126 * if local rtp port isn't set any available port will be used for the local
127 * rtp and rtcp ports
128 * if the local rtcp port is not set it will be the local rtp port + 1
129 */
130
131 static int rtp_open(URLContext *h, const char *uri, int flags)
132 {
133 RTPContext *s;
134 int rtp_port, rtcp_port,
135 is_output, ttl,
136 local_rtp_port, local_rtcp_port, max_packet_size;
137 char hostname[256];
138 char buf[1024];
139 char path[1024];
140 const char *p;
141
142 is_output = (flags & URL_WRONLY);
143
144 s = av_mallocz(sizeof(RTPContext));
145 if (!s)
146 return AVERROR(ENOMEM);
147 h->priv_data = s;
148
149 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
150 path, sizeof(path), uri);
151 /* extract parameters */
152 ttl = -1;
153 rtcp_port = rtp_port+1;
154 local_rtp_port = -1;
155 local_rtcp_port = -1;
156 max_packet_size = -1;
157
158 p = strchr(uri, '?');
159 if (p) {
160 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
161 ttl = strtol(buf, NULL, 10);
162 }
163 if (find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
164 rtcp_port = strtol(buf, NULL, 10);
165 }
166 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
167 local_rtp_port = strtol(buf, NULL, 10);
168 }
169 if (find_info_tag(buf, sizeof(buf), "localrtpport", p)) {
170 local_rtp_port = strtol(buf, NULL, 10);
171 }
172 if (find_info_tag(buf, sizeof(buf), "localrtcpport", p)) {
173 local_rtcp_port = strtol(buf, NULL, 10);
174 }
175 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
176 max_packet_size = strtol(buf, NULL, 10);
177 }
178 }
179
180 build_udp_url(buf, sizeof(buf),
181 hostname, rtp_port, local_rtp_port, ttl, max_packet_size);
182 if (url_open(&s->rtp_hd, buf, flags) < 0)
183 goto fail;
184 if (local_rtp_port>=0 && local_rtcp_port<0)
185 local_rtcp_port = udp_get_local_port(s->rtp_hd) + 1;
186
187 build_udp_url(buf, sizeof(buf),
188 hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size);
189 if (url_open(&s->rtcp_hd, buf, flags) < 0)
190 goto fail;
191
192 /* just to ease handle access. XXX: need to suppress direct handle
193 access */
194 s->rtp_fd = url_get_file_handle(s->rtp_hd);
195 s->rtcp_fd = url_get_file_handle(s->rtcp_hd);
196
197 h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
198 h->is_streamed = 1;
199 return 0;
200
201 fail:
202 if (s->rtp_hd)
203 url_close(s->rtp_hd);
204 if (s->rtcp_hd)
205 url_close(s->rtcp_hd);
206 av_free(s);
207 return AVERROR(EIO);
208 }
209
210 static int rtp_read(URLContext *h, uint8_t *buf, int size)
211 {
212 RTPContext *s = h->priv_data;
213 struct sockaddr_in from;
214 socklen_t from_len;
215 int len, fd_max, n;
216 fd_set rfds;
217 struct timeval tv;
218 #if 0
219 for(;;) {
220 from_len = sizeof(from);
221 len = recvfrom (s->rtp_fd, buf, size, 0,
222 (struct sockaddr *)&from, &from_len);
223 if (len < 0) {
224 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
225 ff_neterrno() == FF_NETERROR(EINTR))
226 continue;
227 return AVERROR(EIO);
228 }
229 break;
230 }
231 #else
232 for(;;) {
233 if (url_interrupt_cb())
234 return AVERROR(EINTR);
235 /* build fdset to listen to RTP and RTCP packets */
236 FD_ZERO(&rfds);
237 fd_max = s->rtp_fd;
238 FD_SET(s->rtp_fd, &rfds);
239 if (s->rtcp_fd > fd_max)
240 fd_max = s->rtcp_fd;
241 FD_SET(s->rtcp_fd, &rfds);
242 tv.tv_sec = 0;
243 tv.tv_usec = 100 * 1000;
244 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
245 if (n > 0) {
246 /* first try RTCP */
247 if (FD_ISSET(s->rtcp_fd, &rfds)) {
248 from_len = sizeof(from);
249 len = recvfrom (s->rtcp_fd, buf, size, 0,
250 (struct sockaddr *)&from, &from_len);
251 if (len < 0) {
252 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
253 ff_neterrno() == FF_NETERROR(EINTR))
254 continue;
255 return AVERROR(EIO);
256 }
257 break;
258 }
259 /* then RTP */
260 if (FD_ISSET(s->rtp_fd, &rfds)) {
261 from_len = sizeof(from);
262 len = recvfrom (s->rtp_fd, buf, size, 0,
263 (struct sockaddr *)&from, &from_len);
264 if (len < 0) {
265 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
266 ff_neterrno() == FF_NETERROR(EINTR))
267 continue;
268 return AVERROR(EIO);
269 }
270 break;
271 }
272 } else if (n < 0) {
273 if (ff_neterrno() == FF_NETERROR(EINTR))
274 continue;
275 return AVERROR(EIO);
276 }
277 }
278 #endif
279 return len;
280 }
281
282 static int rtp_write(URLContext *h, const uint8_t *buf, int size)
283 {
284 RTPContext *s = h->priv_data;
285 int ret;
286 URLContext *hd;
287
288 if (buf[1] >= RTCP_SR && buf[1] <= RTCP_APP) {
289 /* RTCP payload type */
290 hd = s->rtcp_hd;
291 } else {
292 /* RTP payload type */
293 hd = s->rtp_hd;
294 }
295
296 ret = url_write(hd, buf, size);
297 #if 0
298 {
299 struct timespec ts;
300 ts.tv_sec = 0;
301 ts.tv_nsec = 10 * 1000000;
302 nanosleep(&ts, NULL);
303 }
304 #endif
305 return ret;
306 }
307
308 static int rtp_close(URLContext *h)
309 {
310 RTPContext *s = h->priv_data;
311
312 url_close(s->rtp_hd);
313 url_close(s->rtcp_hd);
314 av_free(s);
315 return 0;
316 }
317
318 /**
319 * Return the local rtp port used by the RTP connection
320 * @param h media file context
321 * @return the local port number
322 */
323
324 int rtp_get_local_rtp_port(URLContext *h)
325 {
326 RTPContext *s = h->priv_data;
327 return udp_get_local_port(s->rtp_hd);
328 }
329
330 /**
331 * Return the local rtp port used by the RTP connection
332 * @param h media file context
333 * @return the local port number
334 */
335
336 int rtp_get_local_port(URLContext *h)
337 {
338 RTPContext *s = h->priv_data;
339 return udp_get_local_port(s->rtp_hd);
340 }
341
342 /**
343 * Return the local rtcp port used by the RTP connection
344 * @param h media file context
345 * @return the local port number
346 */
347
348 int rtp_get_local_rtcp_port(URLContext *h)
349 {
350 RTPContext *s = h->priv_data;
351 return udp_get_local_port(s->rtcp_hd);
352 }
353
354 #if (LIBAVFORMAT_VERSION_MAJOR <= 52)
355 /**
356 * Return the rtp and rtcp file handles for select() usage to wait for
357 * several RTP streams at the same time.
358 * @param h media file context
359 */
360
361 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
362 {
363 RTPContext *s = h->priv_data;
364
365 *prtp_fd = s->rtp_fd;
366 *prtcp_fd = s->rtcp_fd;
367 }
368 #endif
369
370 static int rtp_get_file_handle(URLContext *h)
371 {
372 RTPContext *s = h->priv_data;
373 return s->rtp_fd;
374 }
375
376 int rtp_get_rtcp_file_handle(URLContext *h) {
377 RTPContext *s = h->priv_data;
378 return s->rtcp_fd;
379 }
380
381 URLProtocol rtp_protocol = {
382 "rtp",
383 rtp_open,
384 rtp_read,
385 rtp_write,
386 NULL, /* seek */
387 rtp_close,
388 .url_get_file_handle = rtp_get_file_handle,
389 };