0367198f3626a6867b7e7635181a3b112469f6f4
[libav.git] / libavformat / rtpproto.c
1 /*
2 * RTP network protocol
3 * Copyright (c) 2002 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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/parseutils.h"
28 #include "libavutil/avstring.h"
29 #include "avformat.h"
30 #include "avio_internal.h"
31 #include "rtpdec.h"
32 #include "url.h"
33
34 #include <unistd.h>
35 #include <stdarg.h>
36 #include "internal.h"
37 #include "network.h"
38 #include "os_support.h"
39 #include <fcntl.h>
40 #if HAVE_POLL_H
41 #include <sys/poll.h>
42 #endif
43 #include <sys/time.h>
44
45 #define RTP_TX_BUF_SIZE (64 * 1024)
46 #define RTP_RX_BUF_SIZE (128 * 1024)
47
48 typedef struct RTPContext {
49 URLContext *rtp_hd, *rtcp_hd;
50 int rtp_fd, rtcp_fd;
51 } RTPContext;
52
53 /**
54 * If no filename is given to av_open_input_file because you want to
55 * get the local port first, then you must call this function to set
56 * the remote server address.
57 *
58 * @param h media file context
59 * @param uri of the remote server
60 * @return zero if no error.
61 */
62
63 int rtp_set_remote_url(URLContext *h, const char *uri)
64 {
65 RTPContext *s = h->priv_data;
66 char hostname[256];
67 int port;
68
69 char buf[1024];
70 char path[1024];
71
72 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
73 path, sizeof(path), uri);
74
75 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
76 ff_udp_set_remote_url(s->rtp_hd, buf);
77
78 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port + 1, "%s", path);
79 ff_udp_set_remote_url(s->rtcp_hd, buf);
80 return 0;
81 }
82
83
84 /**
85 * add option to url of the form:
86 * "http://host:port/path?option1=val1&option2=val2...
87 */
88
89 static av_printf_format(3, 4) void url_add_option(char *buf, int buf_size, const char *fmt, ...)
90 {
91 char buf1[1024];
92 va_list ap;
93
94 va_start(ap, fmt);
95 if (strchr(buf, '?'))
96 av_strlcat(buf, "&", buf_size);
97 else
98 av_strlcat(buf, "?", buf_size);
99 vsnprintf(buf1, sizeof(buf1), fmt, ap);
100 av_strlcat(buf, buf1, buf_size);
101 va_end(ap);
102 }
103
104 static void build_udp_url(char *buf, int buf_size,
105 const char *hostname, int port,
106 int local_port, int ttl,
107 int max_packet_size, int connect)
108 {
109 ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
110 if (local_port >= 0)
111 url_add_option(buf, buf_size, "localport=%d", local_port);
112 if (ttl >= 0)
113 url_add_option(buf, buf_size, "ttl=%d", ttl);
114 if (max_packet_size >=0)
115 url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size);
116 if (connect)
117 url_add_option(buf, buf_size, "connect=1");
118 }
119
120 /**
121 * url syntax: rtp://host:port[?option=val...]
122 * option: 'ttl=n' : set the ttl value (for multicast only)
123 * 'rtcpport=n' : set the remote rtcp port to n
124 * 'localrtpport=n' : set the local rtp port to n
125 * 'localrtcpport=n' : set the local rtcp port to n
126 * 'pkt_size=n' : set max packet size
127 * 'connect=0/1' : do a connect() on the UDP socket
128 * deprecated option:
129 * 'localport=n' : set the local port to n
130 *
131 * if rtcpport isn't set the rtcp port will be the rtp port + 1
132 * if local rtp port isn't set any available port will be used for the local
133 * rtp and rtcp ports
134 * if the local rtcp port is not set it will be the local rtp port + 1
135 */
136
137 static int rtp_open(URLContext *h, const char *uri, int flags)
138 {
139 RTPContext *s;
140 int rtp_port, rtcp_port,
141 ttl, connect,
142 local_rtp_port, local_rtcp_port, max_packet_size;
143 char hostname[256];
144 char buf[1024];
145 char path[1024];
146 const char *p;
147
148 s = av_mallocz(sizeof(RTPContext));
149 if (!s)
150 return AVERROR(ENOMEM);
151 h->priv_data = s;
152
153 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
154 path, sizeof(path), uri);
155 /* extract parameters */
156 ttl = -1;
157 rtcp_port = rtp_port+1;
158 local_rtp_port = -1;
159 local_rtcp_port = -1;
160 max_packet_size = -1;
161 connect = 0;
162
163 p = strchr(uri, '?');
164 if (p) {
165 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
166 ttl = strtol(buf, NULL, 10);
167 }
168 if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
169 rtcp_port = strtol(buf, NULL, 10);
170 }
171 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
172 local_rtp_port = strtol(buf, NULL, 10);
173 }
174 if (av_find_info_tag(buf, sizeof(buf), "localrtpport", p)) {
175 local_rtp_port = strtol(buf, NULL, 10);
176 }
177 if (av_find_info_tag(buf, sizeof(buf), "localrtcpport", p)) {
178 local_rtcp_port = strtol(buf, NULL, 10);
179 }
180 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
181 max_packet_size = strtol(buf, NULL, 10);
182 }
183 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
184 connect = strtol(buf, NULL, 10);
185 }
186 }
187
188 build_udp_url(buf, sizeof(buf),
189 hostname, rtp_port, local_rtp_port, ttl, max_packet_size,
190 connect);
191 if (ffurl_open(&s->rtp_hd, buf, flags) < 0)
192 goto fail;
193 if (local_rtp_port>=0 && local_rtcp_port<0)
194 local_rtcp_port = ff_udp_get_local_port(s->rtp_hd) + 1;
195
196 build_udp_url(buf, sizeof(buf),
197 hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size,
198 connect);
199 if (ffurl_open(&s->rtcp_hd, buf, flags) < 0)
200 goto fail;
201
202 /* just to ease handle access. XXX: need to suppress direct handle
203 access */
204 s->rtp_fd = ffurl_get_file_handle(s->rtp_hd);
205 s->rtcp_fd = ffurl_get_file_handle(s->rtcp_hd);
206
207 h->max_packet_size = s->rtp_hd->max_packet_size;
208 h->is_streamed = 1;
209 return 0;
210
211 fail:
212 if (s->rtp_hd)
213 ffurl_close(s->rtp_hd);
214 if (s->rtcp_hd)
215 ffurl_close(s->rtcp_hd);
216 av_free(s);
217 return AVERROR(EIO);
218 }
219
220 static int rtp_read(URLContext *h, uint8_t *buf, int size)
221 {
222 RTPContext *s = h->priv_data;
223 struct sockaddr_storage from;
224 socklen_t from_len;
225 int len, n;
226 struct pollfd p[2] = {{s->rtp_fd, POLLIN, 0}, {s->rtcp_fd, POLLIN, 0}};
227
228 for(;;) {
229 if (url_interrupt_cb())
230 return AVERROR_EXIT;
231 /* build fdset to listen to RTP and RTCP packets */
232 n = poll(p, 2, 100);
233 if (n > 0) {
234 /* first try RTCP */
235 if (p[1].revents & POLLIN) {
236 from_len = sizeof(from);
237 len = recvfrom (s->rtcp_fd, buf, size, 0,
238 (struct sockaddr *)&from, &from_len);
239 if (len < 0) {
240 if (ff_neterrno() == AVERROR(EAGAIN) ||
241 ff_neterrno() == AVERROR(EINTR))
242 continue;
243 return AVERROR(EIO);
244 }
245 break;
246 }
247 /* then RTP */
248 if (p[0].revents & POLLIN) {
249 from_len = sizeof(from);
250 len = recvfrom (s->rtp_fd, buf, size, 0,
251 (struct sockaddr *)&from, &from_len);
252 if (len < 0) {
253 if (ff_neterrno() == AVERROR(EAGAIN) ||
254 ff_neterrno() == AVERROR(EINTR))
255 continue;
256 return AVERROR(EIO);
257 }
258 break;
259 }
260 } else if (n < 0) {
261 if (ff_neterrno() == AVERROR(EINTR))
262 continue;
263 return AVERROR(EIO);
264 }
265 }
266 return len;
267 }
268
269 static int rtp_write(URLContext *h, const uint8_t *buf, int size)
270 {
271 RTPContext *s = h->priv_data;
272 int ret;
273 URLContext *hd;
274
275 if (buf[1] >= RTCP_SR && buf[1] <= RTCP_APP) {
276 /* RTCP payload type */
277 hd = s->rtcp_hd;
278 } else {
279 /* RTP payload type */
280 hd = s->rtp_hd;
281 }
282
283 ret = ffurl_write(hd, buf, size);
284 return ret;
285 }
286
287 static int rtp_close(URLContext *h)
288 {
289 RTPContext *s = h->priv_data;
290
291 ffurl_close(s->rtp_hd);
292 ffurl_close(s->rtcp_hd);
293 av_free(s);
294 return 0;
295 }
296
297 /**
298 * Return the local rtp port used by the RTP connection
299 * @param h media file context
300 * @return the local port number
301 */
302
303 int rtp_get_local_rtp_port(URLContext *h)
304 {
305 RTPContext *s = h->priv_data;
306 return ff_udp_get_local_port(s->rtp_hd);
307 }
308
309 /**
310 * Return the local rtcp port used by the RTP connection
311 * @param h media file context
312 * @return the local port number
313 */
314
315 int rtp_get_local_rtcp_port(URLContext *h)
316 {
317 RTPContext *s = h->priv_data;
318 return ff_udp_get_local_port(s->rtcp_hd);
319 }
320
321 static int rtp_get_file_handle(URLContext *h)
322 {
323 RTPContext *s = h->priv_data;
324 return s->rtp_fd;
325 }
326
327 int rtp_get_rtcp_file_handle(URLContext *h) {
328 RTPContext *s = h->priv_data;
329 return s->rtcp_fd;
330 }
331
332 URLProtocol ff_rtp_protocol = {
333 .name = "rtp",
334 .url_open = rtp_open,
335 .url_read = rtp_read,
336 .url_write = rtp_write,
337 .url_close = rtp_close,
338 .url_get_file_handle = rtp_get_file_handle,
339 };