my_addr = s->dest_addr;
my_addr.sin_port = s->dest_addr.sin_port;
static int udp_open(URLContext *h, const char *uri, int flags){    struct sockaddr_in my_addr, my_addr1;    char hostname[1024];    int port, udp_fd = -1, tmp;    UDPContext *s = NULL;    int is_output, len;    const char *p;    char buf[256];    h->is_streamed = 1;    is_output = (flags & URL_WRONLY);        s = av_malloc(sizeof(UDPContext));    if (!s)        return -ENOMEM;    h->priv_data = s;    s->ttl = 16;    s->is_multicast = 0;    p = strchr(uri, '?');    if (p) {        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {            s->ttl = strtol(buf, NULL, 10);        }        if (find_info_tag(buf, sizeof(buf), "localport", p)) {            s->local_port = strtol(buf, NULL, 10);        }    }    /* fill the dest addr */    url_split(NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);        /* XXX: fix url_split */    if (hostname[0] == '\0' || hostname[0] == '?') {        /* only accepts null hostname if input */        if (s->is_multicast || (flags & URL_WRONLY))            goto fail;    } else {        udp_set_remote_url(h, uri);    }    udp_fd = socket(PF_INET, SOCK_DGRAM, 0);    if (udp_fd < 0)        goto fail;    if (s->is_multicast && !(h->flags & URL_WRONLY)) {        /* special case: the bind must be done on the multicast address */        my_addr = s->dest_addr;    } else {        my_addr.sin_family = AF_INET;        my_addr.sin_port = htons(s->local_port);        my_addr.sin_addr.s_addr = htonl (INADDR_ANY);    }    /* the bind is needed to give a port to the socket now */    if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)         goto fail;    len = sizeof(my_addr1);    getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);    s->local_port = ntohs(my_addr1.sin_port);#ifndef CONFIG_BEOS_NETSERVER    if (s->is_multicast) {        if (h->flags & URL_WRONLY) {            /* output */            if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,                            &s->ttl, sizeof(s->ttl)) < 0) {                perror("IP_MULTICAST_TTL");                goto fail;            }        } else {            /* input */            memset(&s->mreq, 0, sizeof(s->mreq));            s->mreq.imr_multiaddr = s->dest_addr.sin_addr;            s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);            if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,                            &s->mreq, sizeof(s->mreq)) < 0) {                perror("rtp: IP_ADD_MEMBERSHIP");                goto fail;            }        }    }#endif    if (is_output) {        /* limit the tx buf size to limit latency */        tmp = UDP_TX_BUF_SIZE;        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {            perror("setsockopt sndbuf");            goto fail;        }    }    s->udp_fd = udp_fd;    h->max_packet_size = 1472; /* XXX: probe it ? */    return 0; fail:    if (udp_fd >= 0)#ifdef CONFIG_BEOS_NETSERVER        closesocket(udp_fd);#else        close(udp_fd);#endif    av_free(s);    return -EIO;}