1000l to myself for FFMIN(...,0) instead of ...,6)
[libav.git] / libavformat / rtpproto.c
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1/*
2 * RTP network protocol
3 * Copyright (c) 2002 Fabrice Bellard.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19#include "avformat.h"
20
21#include <unistd.h>
51885599 22#include <stdarg.h>
3b50d2ad 23#include <sys/types.h>
b8a78f41 24#include <sys/socket.h>
3b50d2ad 25#include <netinet/in.h>
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26#ifndef __BEOS__
27# include <arpa/inet.h>
28#else
29# include "barpainet.h"
30#endif
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31#include <netdb.h>
32#include <fcntl.h>
33
34#define RTP_TX_BUF_SIZE (64 * 1024)
35#define RTP_RX_BUF_SIZE (128 * 1024)
36
37typedef struct RTPContext {
38 URLContext *rtp_hd, *rtcp_hd;
39 int rtp_fd, rtcp_fd;
40} RTPContext;
41
42/**
43 * If no filename is given to av_open_input_file because you want to
44 * get the local port first, then you must call this function to set
45 * the remote server address.
46 *
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47 * @param s1 media file context
48 * @param uri of the remote server
49 * @return zero if no error.
50 */
51int rtp_set_remote_url(URLContext *h, const char *uri)
52{
53 RTPContext *s = h->priv_data;
54 char hostname[256];
55 int port;
51885599 56
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57 char buf[1024];
58 char path[1024];
59
60 url_split(NULL, 0, hostname, sizeof(hostname), &port,
61 path, sizeof(path), uri);
62
63 snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port, path);
64 udp_set_remote_url(s->rtp_hd, buf);
65
66 snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port + 1, path);
67 udp_set_remote_url(s->rtcp_hd, buf);
68 return 0;
69}
70
71
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72/* add option to url of the form:
73 "http://host:port/path?option1=val1&option2=val2... */
5c91a675 74static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
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75{
76 char buf1[1024];
77 va_list ap;
78
79 va_start(ap, fmt);
80 if (strchr(buf, '?'))
81 pstrcat(buf, buf_size, "&");
82 else
83 pstrcat(buf, buf_size, "?");
84 vsnprintf(buf1, sizeof(buf1), fmt, ap);
85 pstrcat(buf, buf_size, buf1);
86 va_end(ap);
87}
88
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89static void build_udp_url(char *buf, int buf_size,
90 const char *hostname, int port,
91 int local_port, int multicast, int ttl)
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92{
93 snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
94 if (local_port >= 0)
95 url_add_option(buf, buf_size, "localport=%d", local_port);
96 if (multicast)
97 url_add_option(buf, buf_size, "multicast=1", multicast);
98 if (ttl >= 0)
99 url_add_option(buf, buf_size, "ttl=%d", ttl);
100}
101
102/*
103 * url syntax: rtp://host:port[?option=val...]
104 * option: 'multicast=1' : enable multicast
105 * 'ttl=n' : set the ttl value (for multicast only)
106 * 'localport=n' : set the local port to n
107 *
108 */
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109static int rtp_open(URLContext *h, const char *uri, int flags)
110{
111 RTPContext *s;
51885599 112 int port, is_output, is_multicast, ttl, local_port;
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113 char hostname[256];
114 char buf[1024];
115 char path[1024];
51885599 116 const char *p;
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117
118 is_output = (flags & URL_WRONLY);
119
120 s = av_mallocz(sizeof(RTPContext));
121 if (!s)
122 return -ENOMEM;
123 h->priv_data = s;
124
125 url_split(NULL, 0, hostname, sizeof(hostname), &port,
126 path, sizeof(path), uri);
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127 /* extract parameters */
128 is_multicast = 0;
129 ttl = -1;
130 local_port = -1;
131 p = strchr(uri, '?');
132 if (p) {
133 is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
134 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
135 ttl = strtol(buf, NULL, 10);
136 }
137 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
138 local_port = strtol(buf, NULL, 10);
139 }
140 }
3b50d2ad 141
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142 build_udp_url(buf, sizeof(buf),
143 hostname, port, local_port, is_multicast, ttl);
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144 if (url_open(&s->rtp_hd, buf, flags) < 0)
145 goto fail;
146 local_port = udp_get_local_port(s->rtp_hd);
147 /* XXX: need to open another connexion if the port is not even */
148
149 /* well, should suppress localport in path */
150
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151 build_udp_url(buf, sizeof(buf),
152 hostname, port + 1, local_port + 1, is_multicast, ttl);
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153 if (url_open(&s->rtcp_hd, buf, flags) < 0)
154 goto fail;
155
156 /* just to ease handle access. XXX: need to suppress direct handle
157 access */
158 s->rtp_fd = udp_get_file_handle(s->rtp_hd);
159 s->rtcp_fd = udp_get_file_handle(s->rtcp_hd);
160
161 h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
162 h->is_streamed = 1;
163 return 0;
164
165 fail:
166 if (s->rtp_hd)
167 url_close(s->rtp_hd);
168 if (s->rtcp_hd)
169 url_close(s->rtcp_hd);
170 av_free(s);
171 return -EIO;
172}
173
0c1a9eda 174static int rtp_read(URLContext *h, uint8_t *buf, int size)
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175{
176 RTPContext *s = h->priv_data;
177 struct sockaddr_in from;
178 int from_len, len, fd_max, n;
179 fd_set rfds;
180#if 0
181 for(;;) {
182 from_len = sizeof(from);
183 len = recvfrom (s->rtp_fd, buf, size, 0,
184 (struct sockaddr *)&from, &from_len);
185 if (len < 0) {
186 if (errno == EAGAIN || errno == EINTR)
187 continue;
188 return -EIO;
189 }
190 break;
191 }
192#else
193 for(;;) {
194 /* build fdset to listen to RTP and RTCP packets */
195 FD_ZERO(&rfds);
196 fd_max = s->rtp_fd;
197 FD_SET(s->rtp_fd, &rfds);
198 if (s->rtcp_fd > fd_max)
199 fd_max = s->rtcp_fd;
200 FD_SET(s->rtcp_fd, &rfds);
201 n = select(fd_max + 1, &rfds, NULL, NULL, NULL);
202 if (n > 0) {
203 /* first try RTCP */
204 if (FD_ISSET(s->rtcp_fd, &rfds)) {
205 from_len = sizeof(from);
206 len = recvfrom (s->rtcp_fd, buf, size, 0,
207 (struct sockaddr *)&from, &from_len);
208 if (len < 0) {
209 if (errno == EAGAIN || errno == EINTR)
210 continue;
211 return -EIO;
212 }
213 break;
214 }
215 /* then RTP */
216 if (FD_ISSET(s->rtp_fd, &rfds)) {
217 from_len = sizeof(from);
218 len = recvfrom (s->rtp_fd, buf, size, 0,
219 (struct sockaddr *)&from, &from_len);
220 if (len < 0) {
221 if (errno == EAGAIN || errno == EINTR)
222 continue;
223 return -EIO;
224 }
225 break;
226 }
227 }
228 }
229#endif
230 return len;
231}
232
0c1a9eda 233static int rtp_write(URLContext *h, uint8_t *buf, int size)
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234{
235 RTPContext *s = h->priv_data;
51885599 236 int ret;
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237 URLContext *hd;
238
239 if (buf[1] >= 200 && buf[1] <= 204) {
240 /* RTCP payload type */
241 hd = s->rtcp_hd;
242 } else {
243 /* RTP payload type */
244 hd = s->rtp_hd;
245 }
246
247 ret = url_write(hd, buf, size);
248#if 0
249 {
250 struct timespec ts;
251 ts.tv_sec = 0;
252 ts.tv_nsec = 10 * 1000000;
253 nanosleep(&ts, NULL);
254 }
255#endif
256 return ret;
257}
258
259static int rtp_close(URLContext *h)
260{
261 RTPContext *s = h->priv_data;
262
263 url_close(s->rtp_hd);
264 url_close(s->rtcp_hd);
265 av_free(s);
266 return 0;
267}
268
269/**
270 * Return the local port used by the RTP connexion
271 * @param s1 media file context
272 * @return the local port number
273 */
274int rtp_get_local_port(URLContext *h)
275{
276 RTPContext *s = h->priv_data;
277 return udp_get_local_port(s->rtp_hd);
278}
279
280/**
281 * Return the rtp and rtcp file handles for select() usage to wait for several RTP
282 * streams at the same time.
283 * @param h media file context
284 */
285void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
286{
287 RTPContext *s = h->priv_data;
288
289 *prtp_fd = s->rtp_fd;
290 *prtcp_fd = s->rtcp_fd;
291}
292
293URLProtocol rtp_protocol = {
294 "rtp",
295 rtp_open,
296 rtp_read,
297 rtp_write,
298 NULL, /* seek */
299 rtp_close,
300};