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ffmpeg / libavformat / udp.c @ 03c09e43

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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,
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 * 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
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#endif
30

    
31
typedef struct {
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    int udp_fd;
33
    int ttl;
34
    int is_multicast;
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    int local_port;
36
    int reuse_socket;
37
#ifndef CONFIG_IPV6
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    struct sockaddr_in dest_addr;
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#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
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    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;
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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_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];
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    const char *node = 0, *service = "0";
130

    
131
    if (port > 0) {
132
        snprintf(sport, sizeof(sport), "%d", port);
133
        service = sport;
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    }
135
    if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
136
        node = hostname;
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    }
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    memset(&hints, 0, sizeof(hints));
139
    hints.ai_socktype = type;
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    hints.ai_family   = family;
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    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)
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        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)
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        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);
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    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[sizeof(int)*3+1];
200

    
201
    if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0,  sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
202
        av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
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        return -1;
204
    }
205

    
206
    return strtol(sbuf, NULL, 10);
207
}
208

    
209
#else
210

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

    
219
    return sizeof(struct sockaddr_in);
220
}
221

    
222
static int udp_socket_create(UDPContext *s, struct sockaddr_in *addr, int *addr_len)
223
{
224
    int fd;
225

    
226
    fd = socket(AF_INET, SOCK_DGRAM, 0);
227
    if (fd < 0)
228
        return -1;
229

    
230
    addr->sin_family = AF_INET;
231
    addr->sin_addr.s_addr = htonl (INADDR_ANY);
232
    addr->sin_port = htons(s->local_port);
233
    *addr_len = sizeof(struct sockaddr_in);
234

    
235
    return fd;
236
}
237

    
238
static int udp_port(struct sockaddr_in *addr, int len)
239
{
240
    return ntohs(addr->sin_port);
241
}
242
#endif /* CONFIG_IPV6 */
243

    
244

    
245
/**
246
 * If no filename is given to av_open_input_file because you want to
247
 * get the local port first, then you must call this function to set
248
 * the remote server address.
249
 *
250
 * url syntax: udp://host:port[?option=val...]
251
 * option: 'multicast=1' : enable multicast
252
 *         'ttl=n'       : set the ttl value (for multicast only)
253
 *         'localport=n' : set the local port
254
 *         'pkt_size=n'  : set max packet size
255
 *         'reuse=1'     : enable reusing the socket
256
 *
257
 * @param s1 media file context
258
 * @param uri of the remote server
259
 * @return zero if no error.
260
 */
261
int udp_set_remote_url(URLContext *h, const char *uri)
262
{
263
    UDPContext *s = h->priv_data;
264
    char hostname[256];
265
    int port;
266

    
267
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
268

    
269
    /* set the destination address */
270
    s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
271
    if (s->dest_addr_len < 0) {
272
        return AVERROR(EIO);
273
    }
274

    
275
    return 0;
276
}
277

    
278
/**
279
 * Return the local port used by the UDP connexion
280
 * @param s1 media file context
281
 * @return the local port number
282
 */
283
int udp_get_local_port(URLContext *h)
284
{
285
    UDPContext *s = h->priv_data;
286
    return s->local_port;
287
}
288

    
289
/**
290
 * Return the udp file handle for select() usage to wait for several RTP
291
 * streams at the same time.
292
 * @param h media file context
293
 */
294
int udp_get_file_handle(URLContext *h)
295
{
296
    UDPContext *s = h->priv_data;
297
    return s->udp_fd;
298
}
299

    
300
/* put it in UDP context */
301
/* return non zero if error */
302
static int udp_open(URLContext *h, const char *uri, int flags)
303
{
304
    char hostname[1024];
305
    int port, udp_fd = -1, tmp;
306
    UDPContext *s = NULL;
307
    int is_output;
308
    const char *p;
309
    char buf[256];
310
#ifndef CONFIG_IPV6
311
    struct sockaddr_in my_addr;
312
#else
313
    struct sockaddr_storage my_addr;
314
#endif
315
    int len;
316

    
317
    h->is_streamed = 1;
318
    h->max_packet_size = 1472;
319

    
320
    is_output = (flags & URL_WRONLY);
321

    
322
    s = av_mallocz(sizeof(UDPContext));
323
    if (!s)
324
        return AVERROR(ENOMEM);
325

    
326
    h->priv_data = s;
327
    s->ttl = 16;
328
    p = strchr(uri, '?');
329
    if (p) {
330
        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
331
        s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
332
        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
333
            s->ttl = strtol(buf, NULL, 10);
334
        }
335
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
336
            s->local_port = strtol(buf, NULL, 10);
337
        }
338
        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
339
            h->max_packet_size = strtol(buf, NULL, 10);
340
        }
341
    }
342

    
343
    /* fill the dest addr */
344
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
345

    
346
    /* XXX: fix url_split */
347
    if (hostname[0] == '\0' || hostname[0] == '?') {
348
        /* only accepts null hostname if input */
349
        if (s->is_multicast || (flags & URL_WRONLY))
350
            goto fail;
351
    } else {
352
        udp_set_remote_url(h, uri);
353
    }
354

    
355
    if(!ff_network_init())
356
        return AVERROR(EIO);
357

    
358
    if (s->is_multicast && !(h->flags & URL_WRONLY))
359
        s->local_port = port;
360
    udp_fd = udp_socket_create(s, &my_addr, &len);
361
    if (udp_fd < 0)
362
        goto fail;
363

    
364
    if (s->reuse_socket)
365
        if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
366
            goto fail;
367

    
368
    /* the bind is needed to give a port to the socket now */
369
    if (bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
370
        goto fail;
371

    
372
    len = sizeof(my_addr);
373
    getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
374
    s->local_port = udp_port(&my_addr, len);
375

    
376
    if (s->is_multicast) {
377
        if (h->flags & URL_WRONLY) {
378
            /* output */
379
            if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
380
                goto fail;
381
        } else {
382
            /* input */
383
            if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
384
                goto fail;
385
        }
386
    }
387

    
388
    if (is_output) {
389
        /* limit the tx buf size to limit latency */
390
        tmp = UDP_TX_BUF_SIZE;
391
        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
392
            av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
393
            goto fail;
394
        }
395
    } else {
396
        /* set udp recv buffer size to the largest possible udp packet size to
397
         * avoid losing data on OSes that set this too low by default. */
398
        tmp = UDP_MAX_PKT_SIZE;
399
        setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
400
    }
401

    
402
    s->udp_fd = udp_fd;
403
    return 0;
404
 fail:
405
    if (udp_fd >= 0)
406
        closesocket(udp_fd);
407
    av_free(s);
408
    return AVERROR(EIO);
409
}
410

    
411
static int udp_read(URLContext *h, uint8_t *buf, int size)
412
{
413
    UDPContext *s = h->priv_data;
414
    int len;
415

    
416
    for(;;) {
417
        len = recv(s->udp_fd, buf, size, 0);
418
        if (len < 0) {
419
            if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
420
                ff_neterrno() != FF_NETERROR(EINTR))
421
                return AVERROR(EIO);
422
        } else {
423
            break;
424
        }
425
    }
426
    return len;
427
}
428

    
429
static int udp_write(URLContext *h, uint8_t *buf, int size)
430
{
431
    UDPContext *s = h->priv_data;
432
    int ret;
433

    
434
    for(;;) {
435
        ret = sendto (s->udp_fd, buf, size, 0,
436
                      (struct sockaddr *) &s->dest_addr,
437
                      s->dest_addr_len);
438
        if (ret < 0) {
439
            if (ff_neterrno() != FF_NETERROR(EINTR) &&
440
                ff_neterrno() != FF_NETERROR(EAGAIN))
441
                return AVERROR(EIO);
442
        } else {
443
            break;
444
        }
445
    }
446
    return size;
447
}
448

    
449
static int udp_close(URLContext *h)
450
{
451
    UDPContext *s = h->priv_data;
452

    
453
    if (s->is_multicast && !(h->flags & URL_WRONLY))
454
        udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
455
    closesocket(s->udp_fd);
456
    ff_network_close();
457
    av_free(s);
458
    return 0;
459
}
460

    
461
URLProtocol udp_protocol = {
462
    "udp",
463
    udp_open,
464
    udp_read,
465
    udp_write,
466
    NULL, /* seek */
467
    udp_close,
468
};