Change license headers to say 'FFmpeg' instead of 'this program/this library'
[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 #include "avformat.h"
22
23 #include <unistd.h>
24 #include <stdarg.h>
25 #include <sys/types.h>
26 #include <sys/socket.h>
27 #include <netinet/in.h>
28 #ifndef __BEOS__
29 # include <arpa/inet.h>
30 #else
31 # include "barpainet.h"
32 #endif
33 #include <netdb.h>
34 #include <fcntl.h>
35
36 #define RTP_TX_BUF_SIZE (64 * 1024)
37 #define RTP_RX_BUF_SIZE (128 * 1024)
38
39 typedef struct RTPContext {
40 URLContext *rtp_hd, *rtcp_hd;
41 int rtp_fd, rtcp_fd;
42 } RTPContext;
43
44 /**
45 * If no filename is given to av_open_input_file because you want to
46 * get the local port first, then you must call this function to set
47 * the remote server address.
48 *
49 * @param s1 media file context
50 * @param uri of the remote server
51 * @return zero if no error.
52 */
53 int rtp_set_remote_url(URLContext *h, const char *uri)
54 {
55 RTPContext *s = h->priv_data;
56 char hostname[256];
57 int port;
58
59 char buf[1024];
60 char path[1024];
61
62 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
63 path, sizeof(path), uri);
64
65 snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port, path);
66 udp_set_remote_url(s->rtp_hd, buf);
67
68 snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port + 1, path);
69 udp_set_remote_url(s->rtcp_hd, buf);
70 return 0;
71 }
72
73
74 /* add option to url of the form:
75 "http://host:port/path?option1=val1&option2=val2... */
76 static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
77 {
78 char buf1[1024];
79 va_list ap;
80
81 va_start(ap, fmt);
82 if (strchr(buf, '?'))
83 pstrcat(buf, buf_size, "&");
84 else
85 pstrcat(buf, buf_size, "?");
86 vsnprintf(buf1, sizeof(buf1), fmt, ap);
87 pstrcat(buf, buf_size, buf1);
88 va_end(ap);
89 }
90
91 static void build_udp_url(char *buf, int buf_size,
92 const char *hostname, int port,
93 int local_port, int multicast, int ttl)
94 {
95 snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
96 if (local_port >= 0)
97 url_add_option(buf, buf_size, "localport=%d", local_port);
98 if (multicast)
99 url_add_option(buf, buf_size, "multicast=1", multicast);
100 if (ttl >= 0)
101 url_add_option(buf, buf_size, "ttl=%d", ttl);
102 }
103
104 /*
105 * url syntax: rtp://host:port[?option=val...]
106 * option: 'multicast=1' : enable multicast
107 * 'ttl=n' : set the ttl value (for multicast only)
108 * 'localport=n' : set the local port to n
109 *
110 */
111 static int rtp_open(URLContext *h, const char *uri, int flags)
112 {
113 RTPContext *s;
114 int port, is_output, is_multicast, ttl, local_port;
115 char hostname[256];
116 char buf[1024];
117 char path[1024];
118 const char *p;
119
120 is_output = (flags & URL_WRONLY);
121
122 s = av_mallocz(sizeof(RTPContext));
123 if (!s)
124 return -ENOMEM;
125 h->priv_data = s;
126
127 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
128 path, sizeof(path), uri);
129 /* extract parameters */
130 is_multicast = 0;
131 ttl = -1;
132 local_port = -1;
133 p = strchr(uri, '?');
134 if (p) {
135 is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
136 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
137 ttl = strtol(buf, NULL, 10);
138 }
139 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
140 local_port = strtol(buf, NULL, 10);
141 }
142 }
143
144 build_udp_url(buf, sizeof(buf),
145 hostname, port, local_port, is_multicast, ttl);
146 if (url_open(&s->rtp_hd, buf, flags) < 0)
147 goto fail;
148 local_port = udp_get_local_port(s->rtp_hd);
149 /* XXX: need to open another connexion if the port is not even */
150
151 /* well, should suppress localport in path */
152
153 build_udp_url(buf, sizeof(buf),
154 hostname, port + 1, local_port + 1, is_multicast, ttl);
155 if (url_open(&s->rtcp_hd, buf, flags) < 0)
156 goto fail;
157
158 /* just to ease handle access. XXX: need to suppress direct handle
159 access */
160 s->rtp_fd = udp_get_file_handle(s->rtp_hd);
161 s->rtcp_fd = udp_get_file_handle(s->rtcp_hd);
162
163 h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
164 h->is_streamed = 1;
165 return 0;
166
167 fail:
168 if (s->rtp_hd)
169 url_close(s->rtp_hd);
170 if (s->rtcp_hd)
171 url_close(s->rtcp_hd);
172 av_free(s);
173 return AVERROR_IO;
174 }
175
176 static int rtp_read(URLContext *h, uint8_t *buf, int size)
177 {
178 RTPContext *s = h->priv_data;
179 struct sockaddr_in from;
180 socklen_t from_len;
181 int len, fd_max, n;
182 fd_set rfds;
183 #if 0
184 for(;;) {
185 from_len = sizeof(from);
186 len = recvfrom (s->rtp_fd, buf, size, 0,
187 (struct sockaddr *)&from, &from_len);
188 if (len < 0) {
189 if (errno == EAGAIN || errno == EINTR)
190 continue;
191 return AVERROR_IO;
192 }
193 break;
194 }
195 #else
196 for(;;) {
197 /* build fdset to listen to RTP and RTCP packets */
198 FD_ZERO(&rfds);
199 fd_max = s->rtp_fd;
200 FD_SET(s->rtp_fd, &rfds);
201 if (s->rtcp_fd > fd_max)
202 fd_max = s->rtcp_fd;
203 FD_SET(s->rtcp_fd, &rfds);
204 n = select(fd_max + 1, &rfds, NULL, NULL, NULL);
205 if (n > 0) {
206 /* first try RTCP */
207 if (FD_ISSET(s->rtcp_fd, &rfds)) {
208 from_len = sizeof(from);
209 len = recvfrom (s->rtcp_fd, buf, size, 0,
210 (struct sockaddr *)&from, &from_len);
211 if (len < 0) {
212 if (errno == EAGAIN || errno == EINTR)
213 continue;
214 return AVERROR_IO;
215 }
216 break;
217 }
218 /* then RTP */
219 if (FD_ISSET(s->rtp_fd, &rfds)) {
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 (errno == EAGAIN || errno == EINTR)
225 continue;
226 return AVERROR_IO;
227 }
228 break;
229 }
230 }
231 }
232 #endif
233 return len;
234 }
235
236 static int rtp_write(URLContext *h, uint8_t *buf, int size)
237 {
238 RTPContext *s = h->priv_data;
239 int ret;
240 URLContext *hd;
241
242 if (buf[1] >= 200 && buf[1] <= 204) {
243 /* RTCP payload type */
244 hd = s->rtcp_hd;
245 } else {
246 /* RTP payload type */
247 hd = s->rtp_hd;
248 }
249
250 ret = url_write(hd, buf, size);
251 #if 0
252 {
253 struct timespec ts;
254 ts.tv_sec = 0;
255 ts.tv_nsec = 10 * 1000000;
256 nanosleep(&ts, NULL);
257 }
258 #endif
259 return ret;
260 }
261
262 static int rtp_close(URLContext *h)
263 {
264 RTPContext *s = h->priv_data;
265
266 url_close(s->rtp_hd);
267 url_close(s->rtcp_hd);
268 av_free(s);
269 return 0;
270 }
271
272 /**
273 * Return the local port used by the RTP connexion
274 * @param s1 media file context
275 * @return the local port number
276 */
277 int rtp_get_local_port(URLContext *h)
278 {
279 RTPContext *s = h->priv_data;
280 return udp_get_local_port(s->rtp_hd);
281 }
282
283 /**
284 * Return the rtp and rtcp file handles for select() usage to wait for several RTP
285 * streams at the same time.
286 * @param h media file context
287 */
288 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
289 {
290 RTPContext *s = h->priv_data;
291
292 *prtp_fd = s->rtp_fd;
293 *prtcp_fd = s->rtcp_fd;
294 }
295
296 URLProtocol rtp_protocol = {
297 "rtp",
298 rtp_open,
299 rtp_read,
300 rtp_write,
301 NULL, /* seek */
302 rtp_close,
303 };