replace the uses of old string functions that Reimar missed
[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 #include "avstring.h"
23
24 #include <unistd.h>
25 #include <stdarg.h>
26 #include "network.h"
27 #include <fcntl.h>
28
29 #define RTP_TX_BUF_SIZE (64 * 1024)
30 #define RTP_RX_BUF_SIZE (128 * 1024)
31
32 typedef struct RTPContext {
33 URLContext *rtp_hd, *rtcp_hd;
34 int rtp_fd, rtcp_fd;
35 } RTPContext;
36
37 /**
38 * If no filename is given to av_open_input_file because you want to
39 * get the local port first, then you must call this function to set
40 * the remote server address.
41 *
42 * @param s1 media file context
43 * @param uri of the remote server
44 * @return zero if no error.
45 */
46 int rtp_set_remote_url(URLContext *h, const char *uri)
47 {
48 RTPContext *s = h->priv_data;
49 char hostname[256];
50 int port;
51
52 char buf[1024];
53 char path[1024];
54
55 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
56 path, sizeof(path), uri);
57
58 snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port, path);
59 udp_set_remote_url(s->rtp_hd, buf);
60
61 snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port + 1, path);
62 udp_set_remote_url(s->rtcp_hd, buf);
63 return 0;
64 }
65
66
67 /* add option to url of the form:
68 "http://host:port/path?option1=val1&option2=val2... */
69 static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
70 {
71 char buf1[1024];
72 va_list ap;
73
74 va_start(ap, fmt);
75 if (strchr(buf, '?'))
76 av_strlcat(buf, "&", buf_size);
77 else
78 av_strlcat(buf, "?", buf_size);
79 vsnprintf(buf1, sizeof(buf1), fmt, ap);
80 av_strlcat(buf, buf1, buf_size);
81 va_end(ap);
82 }
83
84 static void build_udp_url(char *buf, int buf_size,
85 const char *hostname, int port,
86 int local_port, int multicast, int ttl)
87 {
88 snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
89 if (local_port >= 0)
90 url_add_option(buf, buf_size, "localport=%d", local_port);
91 if (multicast)
92 url_add_option(buf, buf_size, "multicast=1");
93 if (ttl >= 0)
94 url_add_option(buf, buf_size, "ttl=%d", ttl);
95 }
96
97 /*
98 * url syntax: rtp://host:port[?option=val...]
99 * option: 'multicast=1' : enable multicast
100 * 'ttl=n' : set the ttl value (for multicast only)
101 * 'localport=n' : set the local port to n
102 *
103 */
104 static int rtp_open(URLContext *h, const char *uri, int flags)
105 {
106 RTPContext *s;
107 int port, is_output, is_multicast, ttl, local_port;
108 char hostname[256];
109 char buf[1024];
110 char path[1024];
111 const char *p;
112
113 is_output = (flags & URL_WRONLY);
114
115 s = av_mallocz(sizeof(RTPContext));
116 if (!s)
117 return AVERROR(ENOMEM);
118 h->priv_data = s;
119
120 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
121 path, sizeof(path), uri);
122 /* extract parameters */
123 is_multicast = 0;
124 ttl = -1;
125 local_port = -1;
126 p = strchr(uri, '?');
127 if (p) {
128 is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
129 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
130 ttl = strtol(buf, NULL, 10);
131 }
132 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
133 local_port = strtol(buf, NULL, 10);
134 }
135 }
136
137 build_udp_url(buf, sizeof(buf),
138 hostname, port, local_port, is_multicast, ttl);
139 if (url_open(&s->rtp_hd, buf, flags) < 0)
140 goto fail;
141 local_port = udp_get_local_port(s->rtp_hd);
142 /* XXX: need to open another connection if the port is not even */
143
144 /* well, should suppress localport in path */
145
146 build_udp_url(buf, sizeof(buf),
147 hostname, port + 1, local_port + 1, is_multicast, ttl);
148 if (url_open(&s->rtcp_hd, buf, flags) < 0)
149 goto fail;
150
151 /* just to ease handle access. XXX: need to suppress direct handle
152 access */
153 s->rtp_fd = udp_get_file_handle(s->rtp_hd);
154 s->rtcp_fd = udp_get_file_handle(s->rtcp_hd);
155
156 h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
157 h->is_streamed = 1;
158 return 0;
159
160 fail:
161 if (s->rtp_hd)
162 url_close(s->rtp_hd);
163 if (s->rtcp_hd)
164 url_close(s->rtcp_hd);
165 av_free(s);
166 return AVERROR_IO;
167 }
168
169 static int rtp_read(URLContext *h, uint8_t *buf, int size)
170 {
171 RTPContext *s = h->priv_data;
172 struct sockaddr_in from;
173 socklen_t from_len;
174 int len, fd_max, n;
175 fd_set rfds;
176 #if 0
177 for(;;) {
178 from_len = sizeof(from);
179 len = recvfrom (s->rtp_fd, buf, size, 0,
180 (struct sockaddr *)&from, &from_len);
181 if (len < 0) {
182 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
183 ff_neterrno() == FF_NETERROR(EINTR))
184 continue;
185 return AVERROR_IO;
186 }
187 break;
188 }
189 #else
190 for(;;) {
191 /* build fdset to listen to RTP and RTCP packets */
192 FD_ZERO(&rfds);
193 fd_max = s->rtp_fd;
194 FD_SET(s->rtp_fd, &rfds);
195 if (s->rtcp_fd > fd_max)
196 fd_max = s->rtcp_fd;
197 FD_SET(s->rtcp_fd, &rfds);
198 n = select(fd_max + 1, &rfds, NULL, NULL, NULL);
199 if (n > 0) {
200 /* first try RTCP */
201 if (FD_ISSET(s->rtcp_fd, &rfds)) {
202 from_len = sizeof(from);
203 len = recvfrom (s->rtcp_fd, buf, size, 0,
204 (struct sockaddr *)&from, &from_len);
205 if (len < 0) {
206 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
207 ff_neterrno() == FF_NETERROR(EINTR))
208 continue;
209 return AVERROR_IO;
210 }
211 break;
212 }
213 /* then RTP */
214 if (FD_ISSET(s->rtp_fd, &rfds)) {
215 from_len = sizeof(from);
216 len = recvfrom (s->rtp_fd, buf, size, 0,
217 (struct sockaddr *)&from, &from_len);
218 if (len < 0) {
219 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
220 ff_neterrno() == FF_NETERROR(EINTR))
221 continue;
222 return AVERROR_IO;
223 }
224 break;
225 }
226 }
227 }
228 #endif
229 return len;
230 }
231
232 static int rtp_write(URLContext *h, uint8_t *buf, int size)
233 {
234 RTPContext *s = h->priv_data;
235 int ret;
236 URLContext *hd;
237
238 if (buf[1] >= 200 && buf[1] <= 204) {
239 /* RTCP payload type */
240 hd = s->rtcp_hd;
241 } else {
242 /* RTP payload type */
243 hd = s->rtp_hd;
244 }
245
246 ret = url_write(hd, buf, size);
247 #if 0
248 {
249 struct timespec ts;
250 ts.tv_sec = 0;
251 ts.tv_nsec = 10 * 1000000;
252 nanosleep(&ts, NULL);
253 }
254 #endif
255 return ret;
256 }
257
258 static int rtp_close(URLContext *h)
259 {
260 RTPContext *s = h->priv_data;
261
262 url_close(s->rtp_hd);
263 url_close(s->rtcp_hd);
264 av_free(s);
265 return 0;
266 }
267
268 /**
269 * Return the local port used by the RTP connection
270 * @param s1 media file context
271 * @return the local port number
272 */
273 int rtp_get_local_port(URLContext *h)
274 {
275 RTPContext *s = h->priv_data;
276 return udp_get_local_port(s->rtp_hd);
277 }
278
279 /**
280 * Return the rtp and rtcp file handles for select() usage to wait for several RTP
281 * streams at the same time.
282 * @param h media file context
283 */
284 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
285 {
286 RTPContext *s = h->priv_data;
287
288 *prtp_fd = s->rtp_fd;
289 *prtcp_fd = s->rtcp_fd;
290 }
291
292 URLProtocol rtp_protocol = {
293 "rtp",
294 rtp_open,
295 rtp_read,
296 rtp_write,
297 NULL, /* seek */
298 rtp_close,
299 };