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1
/*
2
 * UDP prototype streaming system
3
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
4
 *
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 * 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
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
11
 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21
#include "avformat.h"
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#include <unistd.h>
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#include "network.h"
24
#include "os_support.h"
25

    
26
#ifndef IPV6_ADD_MEMBERSHIP
27
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
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#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
29
#endif
30

    
31
typedef struct {
32
    int udp_fd;
33
    int ttl;
34
    int is_multicast;
35
    int local_port;
36
    int reuse_socket;
37
#ifndef CONFIG_IPV6
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    struct sockaddr_in dest_addr;
39
#else
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    struct sockaddr_storage dest_addr;
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#endif
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    size_t dest_addr_len;
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} UDPContext;
44

    
45
#define UDP_TX_BUF_SIZE 32768
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#define UDP_MAX_PKT_SIZE 65536
47

    
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static int udp_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
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#ifdef IP_MULTICAST_TTL
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    if (addr->sa_family == AF_INET) {
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        if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
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            return -1;
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        }
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    }
56
#endif
57
#ifdef CONFIG_IPV6
58
    if (addr->sa_family == AF_INET6) {
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        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
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            return -1;
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        }
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    }
64
#endif
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    return 0;
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}
67

    
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static int udp_join_multicast_group(int sockfd, struct sockaddr *addr) {
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#ifdef IP_ADD_MEMBERSHIP
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    if (addr->sa_family == AF_INET) {
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        struct ip_mreq mreq;
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        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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        mreq.imr_interface.s_addr= INADDR_ANY;
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        if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
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            return -1;
78
        }
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    }
80
#endif
81
#ifdef CONFIG_IPV6
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    if (addr->sa_family == AF_INET6) {
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        struct ipv6_mreq mreq6;
84

    
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        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
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        mreq6.ipv6mr_interface= 0;
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        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
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            return -1;
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        }
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    }
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#endif
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    return 0;
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}
95

    
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static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr) {
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#ifdef IP_DROP_MEMBERSHIP
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    if (addr->sa_family == AF_INET) {
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        struct ip_mreq mreq;
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        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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        mreq.imr_interface.s_addr= INADDR_ANY;
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        if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
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            return -1;
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        }
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    }
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#endif
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#ifdef CONFIG_IPV6
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    if (addr->sa_family == AF_INET6) {
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        struct ipv6_mreq mreq6;
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        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
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        mreq6.ipv6mr_interface= 0;
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        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
117
            return -1;
118
        }
119
    }
120
#endif
121
    return 0;
122
}
123

    
124
#ifdef CONFIG_IPV6
125
static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
126
    struct addrinfo hints, *res = 0;
127
    int error;
128
    char sport[16];
129
    const char *node = 0, *service = "0";
130

    
131
    if (port > 0) {
132
        snprintf(sport, sizeof(sport), "%d", port);
133
        service = sport;
134
    }
135
    if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
136
        node = hostname;
137
    }
138
    memset(&hints, 0, sizeof(hints));
139
    hints.ai_socktype = type;
140
    hints.ai_family   = family;
141
    hints.ai_flags = flags;
142
    if ((error = getaddrinfo(node, service, &hints, &res))) {
143
        av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
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    }
145

    
146
    return res;
147
}
148

    
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static int udp_set_url(struct sockaddr_storage *addr, const char *hostname, int port) {
150
    struct addrinfo *res0;
151
    int addr_len;
152

    
153
    res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
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    if (res0 == 0) return AVERROR(EIO);
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    memcpy(addr, res0->ai_addr, res0->ai_addrlen);
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    addr_len = res0->ai_addrlen;
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    freeaddrinfo(res0);
158

    
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    return addr_len;
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}
161

    
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static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, int *addr_len)
163
{
164
    int udp_fd = -1;
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    struct addrinfo *res0 = NULL, *res = NULL;
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    int family = AF_UNSPEC;
167

    
168
    if (((struct sockaddr *) &s->dest_addr)->sa_family)
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        family = ((struct sockaddr *) &s->dest_addr)->sa_family;
170
    res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
171
    if (res0 == 0)
172
        goto fail;
173
    for (res = res0; res; res=res->ai_next) {
174
        udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
175
        if (udp_fd > 0) break;
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        av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
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    }
178

    
179
    if (udp_fd < 0)
180
        goto fail;
181

    
182
    memcpy(addr, res->ai_addr, res->ai_addrlen);
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    *addr_len = res->ai_addrlen;
184

    
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    freeaddrinfo(res0);
186

    
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    return udp_fd;
188

    
189
 fail:
190
    if (udp_fd >= 0)
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        closesocket(udp_fd);
192
    if(res0)
193
        freeaddrinfo(res0);
194
    return -1;
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}
196

    
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static int udp_port(struct sockaddr_storage *addr, int addr_len)
198
{
199
    char sbuf[NI_MAXSERV];
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    char hbuf[NI_MAXHOST];
201

    
202
    if (getnameinfo((struct sockaddr *)addr, addr_len, hbuf, sizeof(hbuf),  sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
203
        av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
204
        return -1;
205
    }
206

    
207
    return strtol(sbuf, NULL, 10);
208
}
209

    
210
#else
211

    
212
static int udp_set_url(struct sockaddr_in *addr, const char *hostname, int port)
213
{
214
    /* set the destination address */
215
    if (resolve_host(&addr->sin_addr, hostname) < 0)
216
        return AVERROR(EIO);
217
    addr->sin_family = AF_INET;
218
    addr->sin_port = htons(port);
219

    
220
    return sizeof(struct sockaddr_in);
221
}
222

    
223
static int udp_socket_create(UDPContext *s, struct sockaddr_in *addr, int *addr_len)
224
{
225
    int fd;
226

    
227
    fd = socket(AF_INET, SOCK_DGRAM, 0);
228
    if (fd < 0)
229
        return -1;
230

    
231
    addr->sin_family = AF_INET;
232
    addr->sin_addr.s_addr = htonl (INADDR_ANY);
233
    addr->sin_port = htons(s->local_port);
234
    *addr_len = sizeof(struct sockaddr_in);
235

    
236
    return fd;
237
}
238

    
239
static int udp_port(struct sockaddr_in *addr, int len)
240
{
241
    return ntohs(addr->sin_port);
242
}
243
#endif /* CONFIG_IPV6 */
244

    
245

    
246
/**
247
 * If no filename is given to av_open_input_file because you want to
248
 * get the local port first, then you must call this function to set
249
 * the remote server address.
250
 *
251
 * url syntax: udp://host:port[?option=val...]
252
 * option: 'multicast=1' : enable multicast
253
 *         'ttl=n'       : set the ttl value (for multicast only)
254
 *         'localport=n' : set the local port
255
 *         'pkt_size=n'  : set max packet size
256
 *         'reuse=1'     : enable reusing the socket
257
 *
258
 * @param s1 media file context
259
 * @param uri of the remote server
260
 * @return zero if no error.
261
 */
262
int udp_set_remote_url(URLContext *h, const char *uri)
263
{
264
    UDPContext *s = h->priv_data;
265
    char hostname[256];
266
    int port;
267

    
268
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
269

    
270
    /* set the destination address */
271
    s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
272
    if (s->dest_addr_len < 0) {
273
        return AVERROR(EIO);
274
    }
275

    
276
    return 0;
277
}
278

    
279
/**
280
 * Return the local port used by the UDP connexion
281
 * @param s1 media file context
282
 * @return the local port number
283
 */
284
int udp_get_local_port(URLContext *h)
285
{
286
    UDPContext *s = h->priv_data;
287
    return s->local_port;
288
}
289

    
290
/**
291
 * Return the udp file handle for select() usage to wait for several RTP
292
 * streams at the same time.
293
 * @param h media file context
294
 */
295
int udp_get_file_handle(URLContext *h)
296
{
297
    UDPContext *s = h->priv_data;
298
    return s->udp_fd;
299
}
300

    
301
/* put it in UDP context */
302
/* return non zero if error */
303
static int udp_open(URLContext *h, const char *uri, int flags)
304
{
305
    char hostname[1024];
306
    int port, udp_fd = -1, tmp;
307
    UDPContext *s = NULL;
308
    int is_output;
309
    const char *p;
310
    char buf[256];
311
#ifndef CONFIG_IPV6
312
    struct sockaddr_in my_addr;
313
#else
314
    struct sockaddr_storage my_addr;
315
#endif
316
    int len;
317

    
318
    h->is_streamed = 1;
319
    h->max_packet_size = 1472;
320

    
321
    is_output = (flags & URL_WRONLY);
322

    
323
    s = av_mallocz(sizeof(UDPContext));
324
    if (!s)
325
        return AVERROR(ENOMEM);
326

    
327
    h->priv_data = s;
328
    s->ttl = 16;
329
    p = strchr(uri, '?');
330
    if (p) {
331
        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
332
        s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
333
        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
334
            s->ttl = strtol(buf, NULL, 10);
335
        }
336
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
337
            s->local_port = strtol(buf, NULL, 10);
338
        }
339
        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
340
            h->max_packet_size = strtol(buf, NULL, 10);
341
        }
342
    }
343

    
344
    /* fill the dest addr */
345
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
346

    
347
    /* XXX: fix url_split */
348
    if (hostname[0] == '\0' || hostname[0] == '?') {
349
        /* only accepts null hostname if input */
350
        if (s->is_multicast || (flags & URL_WRONLY))
351
            goto fail;
352
    } else {
353
        udp_set_remote_url(h, uri);
354
    }
355

    
356
    if(!ff_network_init())
357
        return AVERROR(EIO);
358

    
359
    if (s->is_multicast && !(h->flags & URL_WRONLY))
360
        s->local_port = port;
361
    udp_fd = udp_socket_create(s, &my_addr, &len);
362
    if (udp_fd < 0)
363
        goto fail;
364

    
365
    if (s->reuse_socket)
366
        if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
367
            goto fail;
368

    
369
    /* the bind is needed to give a port to the socket now */
370
    if (bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
371
        goto fail;
372

    
373
    len = sizeof(my_addr);
374
    getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
375
    s->local_port = udp_port(&my_addr, len);
376

    
377
    if (s->is_multicast) {
378
        if (h->flags & URL_WRONLY) {
379
            /* output */
380
            if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
381
                goto fail;
382
        } else {
383
            /* input */
384
            if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
385
                goto fail;
386
        }
387
    }
388

    
389
    if (is_output) {
390
        /* limit the tx buf size to limit latency */
391
        tmp = UDP_TX_BUF_SIZE;
392
        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
393
            av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
394
            goto fail;
395
        }
396
    } else {
397
        /* set udp recv buffer size to the largest possible udp packet size to
398
         * avoid losing data on OSes that set this too low by default. */
399
        tmp = UDP_MAX_PKT_SIZE;
400
        setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
401
    }
402

    
403
    s->udp_fd = udp_fd;
404
    return 0;
405
 fail:
406
    if (udp_fd >= 0)
407
        closesocket(udp_fd);
408
    av_free(s);
409
    return AVERROR(EIO);
410
}
411

    
412
static int udp_read(URLContext *h, uint8_t *buf, int size)
413
{
414
    UDPContext *s = h->priv_data;
415
    int len;
416

    
417
    for(;;) {
418
        len = recv(s->udp_fd, buf, size, 0);
419
        if (len < 0) {
420
            if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
421
                ff_neterrno() != FF_NETERROR(EINTR))
422
                return AVERROR(EIO);
423
        } else {
424
            break;
425
        }
426
    }
427
    return len;
428
}
429

    
430
static int udp_write(URLContext *h, uint8_t *buf, int size)
431
{
432
    UDPContext *s = h->priv_data;
433
    int ret;
434

    
435
    for(;;) {
436
        ret = sendto (s->udp_fd, buf, size, 0,
437
                      (struct sockaddr *) &s->dest_addr,
438
                      s->dest_addr_len);
439
        if (ret < 0) {
440
            if (ff_neterrno() != FF_NETERROR(EINTR) &&
441
                ff_neterrno() != FF_NETERROR(EAGAIN))
442
                return AVERROR(EIO);
443
        } else {
444
            break;
445
        }
446
    }
447
    return size;
448
}
449

    
450
static int udp_close(URLContext *h)
451
{
452
    UDPContext *s = h->priv_data;
453

    
454
    if (s->is_multicast && !(h->flags & URL_WRONLY))
455
        udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
456
    closesocket(s->udp_fd);
457
    ff_network_close();
458
    av_free(s);
459
    return 0;
460
}
461

    
462
URLProtocol udp_protocol = {
463
    "udp",
464
    udp_open,
465
    udp_read,
466
    udp_write,
467
    NULL, /* seek */
468
    udp_close,
469
};