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