Statistics
| Branch: | Revision:

ffmpeg / libavformat / rtpproto.c @ 1ae7518d

History | View | Annotate | Download (7.97 KB)

1 3b50d2ad Fabrice Bellard
/*
2
 * RTP network protocol
3
 * Copyright (c) 2002 Fabrice Bellard.
4
 *
5 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8 3b50d2ad Fabrice Bellard
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
11 3b50d2ad Fabrice Bellard
 *
12 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
13 3b50d2ad Fabrice Bellard
 * 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 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
19 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 3b50d2ad Fabrice Bellard
 */
21
#include "avformat.h"
22
23
#include <unistd.h>
24 51885599 Fabrice Bellard
#include <stdarg.h>
25 3b50d2ad Fabrice Bellard
#include <sys/types.h>
26 b8a78f41 Michael Niedermayer
#include <sys/socket.h>
27 3b50d2ad Fabrice Bellard
#include <netinet/in.h>
28 e9d511dc François Revol
#include <arpa/inet.h>
29 3b50d2ad Fabrice Bellard
#include <netdb.h>
30
#include <fcntl.h>
31
32
#define RTP_TX_BUF_SIZE  (64 * 1024)
33
#define RTP_RX_BUF_SIZE  (128 * 1024)
34
35
typedef struct RTPContext {
36
    URLContext *rtp_hd, *rtcp_hd;
37
    int rtp_fd, rtcp_fd;
38
} RTPContext;
39
40
/**
41
 * If no filename is given to av_open_input_file because you want to
42
 * get the local port first, then you must call this function to set
43
 * the remote server address.
44
 *
45
 * @param s1 media file context
46
 * @param uri of the remote server
47
 * @return zero if no error.
48
 */
49
int rtp_set_remote_url(URLContext *h, const char *uri)
50
{
51
    RTPContext *s = h->priv_data;
52
    char hostname[256];
53
    int port;
54 51885599 Fabrice Bellard
55 3b50d2ad Fabrice Bellard
    char buf[1024];
56
    char path[1024];
57 115329f1 Diego Biurrun
58
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
59 3b50d2ad Fabrice Bellard
              path, sizeof(path), uri);
60
61
    snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port, path);
62
    udp_set_remote_url(s->rtp_hd, buf);
63
64
    snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port + 1, path);
65
    udp_set_remote_url(s->rtcp_hd, buf);
66
    return 0;
67
}
68
69
70 51885599 Fabrice Bellard
/* add option to url of the form:
71
   "http://host:port/path?option1=val1&option2=val2... */
72 5c91a675 Zdenek Kabelac
static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
73 51885599 Fabrice Bellard
{
74
    char buf1[1024];
75
    va_list ap;
76
77
    va_start(ap, fmt);
78
    if (strchr(buf, '?'))
79
        pstrcat(buf, buf_size, "&");
80
    else
81
        pstrcat(buf, buf_size, "?");
82
    vsnprintf(buf1, sizeof(buf1), fmt, ap);
83
    pstrcat(buf, buf_size, buf1);
84
    va_end(ap);
85
}
86
87 5c91a675 Zdenek Kabelac
static void build_udp_url(char *buf, int buf_size,
88 bb270c08 Diego Biurrun
                          const char *hostname, int port,
89
                          int local_port, int multicast, int ttl)
90 51885599 Fabrice Bellard
{
91
    snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
92
    if (local_port >= 0)
93
        url_add_option(buf, buf_size, "localport=%d", local_port);
94
    if (multicast)
95
        url_add_option(buf, buf_size, "multicast=1", multicast);
96
    if (ttl >= 0)
97
        url_add_option(buf, buf_size, "ttl=%d", ttl);
98
}
99
100
/*
101
 * url syntax: rtp://host:port[?option=val...]
102 115329f1 Diego Biurrun
 * option: 'multicast=1' : enable multicast
103 51885599 Fabrice Bellard
 *         'ttl=n'       : set the ttl value (for multicast only)
104
 *         'localport=n' : set the local port to n
105
 *
106
 */
107 3b50d2ad Fabrice Bellard
static int rtp_open(URLContext *h, const char *uri, int flags)
108
{
109
    RTPContext *s;
110 51885599 Fabrice Bellard
    int port, is_output, is_multicast, ttl, local_port;
111 3b50d2ad Fabrice Bellard
    char hostname[256];
112
    char buf[1024];
113
    char path[1024];
114 51885599 Fabrice Bellard
    const char *p;
115 115329f1 Diego Biurrun
116 3b50d2ad Fabrice Bellard
    is_output = (flags & URL_WRONLY);
117
118
    s = av_mallocz(sizeof(RTPContext));
119
    if (!s)
120
        return -ENOMEM;
121
    h->priv_data = s;
122 115329f1 Diego Biurrun
123
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
124 3b50d2ad Fabrice Bellard
              path, sizeof(path), uri);
125 51885599 Fabrice Bellard
    /* extract parameters */
126
    is_multicast = 0;
127
    ttl = -1;
128
    local_port = -1;
129
    p = strchr(uri, '?');
130
    if (p) {
131
        is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
132
        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
133
            ttl = strtol(buf, NULL, 10);
134
        }
135
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
136
            local_port = strtol(buf, NULL, 10);
137
        }
138
    }
139 3b50d2ad Fabrice Bellard
140 51885599 Fabrice Bellard
    build_udp_url(buf, sizeof(buf),
141
                  hostname, port, local_port, is_multicast, ttl);
142 3b50d2ad Fabrice Bellard
    if (url_open(&s->rtp_hd, buf, flags) < 0)
143
        goto fail;
144
    local_port = udp_get_local_port(s->rtp_hd);
145
    /* XXX: need to open another connexion if the port is not even */
146
147
    /* well, should suppress localport in path */
148 115329f1 Diego Biurrun
149 51885599 Fabrice Bellard
    build_udp_url(buf, sizeof(buf),
150
                  hostname, port + 1, local_port + 1, is_multicast, ttl);
151 3b50d2ad Fabrice Bellard
    if (url_open(&s->rtcp_hd, buf, flags) < 0)
152
        goto fail;
153 115329f1 Diego Biurrun
154 3b50d2ad Fabrice Bellard
    /* just to ease handle access. XXX: need to suppress direct handle
155
       access */
156
    s->rtp_fd = udp_get_file_handle(s->rtp_hd);
157
    s->rtcp_fd = udp_get_file_handle(s->rtcp_hd);
158
159 115329f1 Diego Biurrun
    h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
160 3b50d2ad Fabrice Bellard
    h->is_streamed = 1;
161
    return 0;
162
163
 fail:
164
    if (s->rtp_hd)
165
        url_close(s->rtp_hd);
166
    if (s->rtcp_hd)
167
        url_close(s->rtcp_hd);
168
    av_free(s);
169 0bd586c5 Mike Melanson
    return AVERROR_IO;
170 3b50d2ad Fabrice Bellard
}
171
172 0c1a9eda Zdenek Kabelac
static int rtp_read(URLContext *h, uint8_t *buf, int size)
173 3b50d2ad Fabrice Bellard
{
174
    RTPContext *s = h->priv_data;
175
    struct sockaddr_in from;
176 191e8ca7 Måns Rullgård
    socklen_t from_len;
177
    int len, fd_max, n;
178 3b50d2ad Fabrice Bellard
    fd_set rfds;
179
#if 0
180
    for(;;) {
181
        from_len = sizeof(from);
182
        len = recvfrom (s->rtp_fd, buf, size, 0,
183
                        (struct sockaddr *)&from, &from_len);
184
        if (len < 0) {
185
            if (errno == EAGAIN || errno == EINTR)
186
                continue;
187 0bd586c5 Mike Melanson
            return AVERROR_IO;
188 3b50d2ad Fabrice Bellard
        }
189
        break;
190
    }
191
#else
192
    for(;;) {
193
        /* build fdset to listen to RTP and RTCP packets */
194
        FD_ZERO(&rfds);
195
        fd_max = s->rtp_fd;
196
        FD_SET(s->rtp_fd, &rfds);
197
        if (s->rtcp_fd > fd_max)
198
            fd_max = s->rtcp_fd;
199
        FD_SET(s->rtcp_fd, &rfds);
200
        n = select(fd_max + 1, &rfds, NULL, NULL, NULL);
201
        if (n > 0) {
202
            /* first try RTCP */
203
            if (FD_ISSET(s->rtcp_fd, &rfds)) {
204
                from_len = sizeof(from);
205
                len = recvfrom (s->rtcp_fd, buf, size, 0,
206
                                (struct sockaddr *)&from, &from_len);
207
                if (len < 0) {
208
                    if (errno == EAGAIN || errno == EINTR)
209
                        continue;
210 0bd586c5 Mike Melanson
                    return AVERROR_IO;
211 3b50d2ad Fabrice Bellard
                }
212
                break;
213
            }
214
            /* then RTP */
215
            if (FD_ISSET(s->rtp_fd, &rfds)) {
216
                from_len = sizeof(from);
217
                len = recvfrom (s->rtp_fd, buf, size, 0,
218
                                (struct sockaddr *)&from, &from_len);
219
                if (len < 0) {
220
                    if (errno == EAGAIN || errno == EINTR)
221
                        continue;
222 0bd586c5 Mike Melanson
                    return AVERROR_IO;
223 3b50d2ad Fabrice Bellard
                }
224
                break;
225
            }
226
        }
227
    }
228
#endif
229
    return len;
230
}
231
232 0c1a9eda Zdenek Kabelac
static int rtp_write(URLContext *h, uint8_t *buf, int size)
233 3b50d2ad Fabrice Bellard
{
234
    RTPContext *s = h->priv_data;
235 51885599 Fabrice Bellard
    int ret;
236 3b50d2ad Fabrice Bellard
    URLContext *hd;
237 115329f1 Diego Biurrun
238 3b50d2ad Fabrice Bellard
    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 connexion
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
};