Don't report EINTR from select as an error, retry select instead
[libav.git] / libavformat / rtpproto.c
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1/*
2 * RTP network protocol
406792e7 3 * Copyright (c) 2002 Fabrice Bellard
3b50d2ad 4 *
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
3b50d2ad 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
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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
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
3b50d2ad 20 */
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21
22/**
bad5537e 23 * @file libavformat/rtpproto.c
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24 * RTP protocol
25 */
26
245976da 27#include "libavutil/avstring.h"
3b50d2ad 28#include "avformat.h"
1e6365b3 29#include "rtpdec.h"
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30
31#include <unistd.h>
51885599 32#include <stdarg.h>
e4a9e3cc 33#include "internal.h"
42572ef5 34#include "network.h"
93115b82 35#include "os_support.h"
3b50d2ad 36#include <fcntl.h>
b250f9c6 37#if HAVE_SYS_SELECT_H
0e55ba72 38#include <sys/select.h>
7139bfa8 39#endif
611b17d7 40#include <sys/time.h>
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41
42#define RTP_TX_BUF_SIZE (64 * 1024)
43#define RTP_RX_BUF_SIZE (128 * 1024)
44
45typedef struct RTPContext {
46 URLContext *rtp_hd, *rtcp_hd;
47 int rtp_fd, rtcp_fd;
48} RTPContext;
49
50/**
51 * If no filename is given to av_open_input_file because you want to
52 * get the local port first, then you must call this function to set
53 * the remote server address.
54 *
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55 * @param s1 media file context
56 * @param uri of the remote server
57 * @return zero if no error.
58 */
b4999290 59
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60int rtp_set_remote_url(URLContext *h, const char *uri)
61{
62 RTPContext *s = h->priv_data;
63 char hostname[256];
64 int port;
51885599 65
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66 char buf[1024];
67 char path[1024];
115329f1 68
c5c6e67c 69 ff_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
f984dcf6 70 path, sizeof(path), uri);
3b50d2ad 71
57b5555c 72 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
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73 udp_set_remote_url(s->rtp_hd, buf);
74
57b5555c 75 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port + 1, "%s", path);
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76 udp_set_remote_url(s->rtcp_hd, buf);
77 return 0;
78}
79
80
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81/**
82 * add option to url of the form:
83 * "http://host:port/path?option1=val1&option2=val2...
84 */
85
5c91a675 86static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
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87{
88 char buf1[1024];
89 va_list ap;
90
91 va_start(ap, fmt);
92 if (strchr(buf, '?'))
f7d78f36 93 av_strlcat(buf, "&", buf_size);
51885599 94 else
f7d78f36 95 av_strlcat(buf, "?", buf_size);
51885599 96 vsnprintf(buf1, sizeof(buf1), fmt, ap);
f7d78f36 97 av_strlcat(buf, buf1, buf_size);
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98 va_end(ap);
99}
100
5c91a675 101static void build_udp_url(char *buf, int buf_size,
bb270c08 102 const char *hostname, int port,
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103 int local_port, int ttl,
104 int max_packet_size)
51885599 105{
57b5555c 106 ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
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107 if (local_port >= 0)
108 url_add_option(buf, buf_size, "localport=%d", local_port);
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109 if (ttl >= 0)
110 url_add_option(buf, buf_size, "ttl=%d", ttl);
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111 if (max_packet_size >=0)
112 url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size);
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113}
114
b4999290 115/**
51885599 116 * url syntax: rtp://host:port[?option=val...]
35b74c3d 117 * option: 'ttl=n' : set the ttl value (for multicast only)
51885599 118 * 'localport=n' : set the local port to n
fc9b22dd 119 * 'pkt_size=n' : set max packet size
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120 *
121 */
b4999290 122
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123static int rtp_open(URLContext *h, const char *uri, int flags)
124{
125 RTPContext *s;
fc9b22dd 126 int port, is_output, ttl, local_port, max_packet_size;
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127 char hostname[256];
128 char buf[1024];
129 char path[1024];
51885599 130 const char *p;
115329f1 131
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132 is_output = (flags & URL_WRONLY);
133
134 s = av_mallocz(sizeof(RTPContext));
135 if (!s)
8fa36ae0 136 return AVERROR(ENOMEM);
3b50d2ad 137 h->priv_data = s;
115329f1 138
c5c6e67c 139 ff_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
f984dcf6 140 path, sizeof(path), uri);
51885599 141 /* extract parameters */
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142 ttl = -1;
143 local_port = -1;
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144 max_packet_size = -1;
145
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146 p = strchr(uri, '?');
147 if (p) {
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148 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
149 ttl = strtol(buf, NULL, 10);
150 }
151 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
152 local_port = strtol(buf, NULL, 10);
153 }
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154 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
155 max_packet_size = strtol(buf, NULL, 10);
156 }
51885599 157 }
3b50d2ad 158
51885599 159 build_udp_url(buf, sizeof(buf),
fc9b22dd 160 hostname, port, local_port, ttl, max_packet_size);
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161 if (url_open(&s->rtp_hd, buf, flags) < 0)
162 goto fail;
163 local_port = udp_get_local_port(s->rtp_hd);
b484ec78 164 /* XXX: need to open another connection if the port is not even */
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165
166 /* well, should suppress localport in path */
115329f1 167
51885599 168 build_udp_url(buf, sizeof(buf),
fc9b22dd 169 hostname, port + 1, local_port + 1, ttl, max_packet_size);
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170 if (url_open(&s->rtcp_hd, buf, flags) < 0)
171 goto fail;
115329f1 172
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173 /* just to ease handle access. XXX: need to suppress direct handle
174 access */
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175 s->rtp_fd = url_get_file_handle(s->rtp_hd);
176 s->rtcp_fd = url_get_file_handle(s->rtcp_hd);
3b50d2ad 177
115329f1 178 h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
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179 h->is_streamed = 1;
180 return 0;
181
182 fail:
183 if (s->rtp_hd)
184 url_close(s->rtp_hd);
185 if (s->rtcp_hd)
186 url_close(s->rtcp_hd);
187 av_free(s);
6f3e0b21 188 return AVERROR(EIO);
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189}
190
0c1a9eda 191static int rtp_read(URLContext *h, uint8_t *buf, int size)
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192{
193 RTPContext *s = h->priv_data;
194 struct sockaddr_in from;
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195 socklen_t from_len;
196 int len, fd_max, n;
3b50d2ad 197 fd_set rfds;
c2b40ac2 198 struct timeval tv;
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199#if 0
200 for(;;) {
201 from_len = sizeof(from);
202 len = recvfrom (s->rtp_fd, buf, size, 0,
203 (struct sockaddr *)&from, &from_len);
204 if (len < 0) {
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205 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
206 ff_neterrno() == FF_NETERROR(EINTR))
3b50d2ad 207 continue;
6f3e0b21 208 return AVERROR(EIO);
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209 }
210 break;
211 }
212#else
213 for(;;) {
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214 if (url_interrupt_cb())
215 return AVERROR(EINTR);
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216 /* build fdset to listen to RTP and RTCP packets */
217 FD_ZERO(&rfds);
218 fd_max = s->rtp_fd;
219 FD_SET(s->rtp_fd, &rfds);
220 if (s->rtcp_fd > fd_max)
221 fd_max = s->rtcp_fd;
222 FD_SET(s->rtcp_fd, &rfds);
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223 tv.tv_sec = 0;
224 tv.tv_usec = 100 * 1000;
225 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
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226 if (n > 0) {
227 /* first try RTCP */
228 if (FD_ISSET(s->rtcp_fd, &rfds)) {
229 from_len = sizeof(from);
230 len = recvfrom (s->rtcp_fd, buf, size, 0,
231 (struct sockaddr *)&from, &from_len);
232 if (len < 0) {
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233 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
234 ff_neterrno() == FF_NETERROR(EINTR))
3b50d2ad 235 continue;
6f3e0b21 236 return AVERROR(EIO);
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237 }
238 break;
239 }
240 /* then RTP */
241 if (FD_ISSET(s->rtp_fd, &rfds)) {
242 from_len = sizeof(from);
243 len = recvfrom (s->rtp_fd, buf, size, 0,
244 (struct sockaddr *)&from, &from_len);
245 if (len < 0) {
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246 if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
247 ff_neterrno() == FF_NETERROR(EINTR))
3b50d2ad 248 continue;
6f3e0b21 249 return AVERROR(EIO);
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250 }
251 break;
252 }
886f3f2f 253 } else if (n < 0) {
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254 if (ff_neterrno() == FF_NETERROR(EINTR))
255 continue;
886f3f2f 256 return AVERROR(EIO);
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257 }
258 }
259#endif
260 return len;
261}
262
0c1a9eda 263static int rtp_write(URLContext *h, uint8_t *buf, int size)
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264{
265 RTPContext *s = h->priv_data;
51885599 266 int ret;
3b50d2ad 267 URLContext *hd;
115329f1 268
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269 if (buf[1] >= 200 && buf[1] <= 204) {
270 /* RTCP payload type */
271 hd = s->rtcp_hd;
272 } else {
273 /* RTP payload type */
274 hd = s->rtp_hd;
275 }
276
277 ret = url_write(hd, buf, size);
278#if 0
279 {
280 struct timespec ts;
281 ts.tv_sec = 0;
282 ts.tv_nsec = 10 * 1000000;
283 nanosleep(&ts, NULL);
284 }
285#endif
286 return ret;
287}
288
289static int rtp_close(URLContext *h)
290{
291 RTPContext *s = h->priv_data;
292
293 url_close(s->rtp_hd);
294 url_close(s->rtcp_hd);
295 av_free(s);
296 return 0;
297}
298
299/**
b484ec78 300 * Return the local port used by the RTP connection
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301 * @param s1 media file context
302 * @return the local port number
303 */
b4999290 304
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305int rtp_get_local_port(URLContext *h)
306{
307 RTPContext *s = h->priv_data;
308 return udp_get_local_port(s->rtp_hd);
309}
310
f0a80394 311#if (LIBAVFORMAT_VERSION_MAJOR <= 52)
3b50d2ad 312/**
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313 * Return the rtp and rtcp file handles for select() usage to wait for
314 * several RTP streams at the same time.
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315 * @param h media file context
316 */
b4999290 317
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318void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
319{
320 RTPContext *s = h->priv_data;
321
322 *prtp_fd = s->rtp_fd;
323 *prtcp_fd = s->rtcp_fd;
324}
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325#endif
326
327static int rtp_get_file_handle(URLContext *h)
328{
329 RTPContext *s = h->priv_data;
330 return s->rtp_fd;
331}
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332
333URLProtocol rtp_protocol = {
334 "rtp",
335 rtp_open,
336 rtp_read,
337 rtp_write,
338 NULL, /* seek */
339 rtp_close,
f0a80394 340 .url_get_file_handle = rtp_get_file_handle,
3b50d2ad 341};