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149 lines
3.6 KiB
C
149 lines
3.6 KiB
C
/*
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* UDP prototype streaming system
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* Copyright (c) 2000 Gerard Lantau.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include "avformat.h"
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typedef struct {
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int udp_socket;
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int max_payload_size; /* in bytes */
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} UDPContext;
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#define UDP_TX_BUF_SIZE 32768
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/* put it in UDP context */
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static struct sockaddr_in dest_addr;
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/* return non zero if error */
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static int udp_open(URLContext *h, const char *uri, int flags)
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{
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int local_port = 0;
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struct sockaddr_in my_addr;
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const char *p, *q;
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char hostname[1024];
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int port, udp_socket, tmp;
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struct hostent *hp;
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UDPContext *s;
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h->is_streamed = 1;
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if (!(flags & URL_WRONLY))
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return -EIO;
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/* fill the dest addr */
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p = uri;
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if (!strstart(p, "udp:", &p))
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return -1;
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q = strchr(p, ':');
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if (!q)
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return -1;
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memcpy(hostname, p, q - p);
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hostname[q - p] = '\0';
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port = strtol(q+1, NULL, 10);
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if (port <= 0)
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return -1;
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dest_addr.sin_family = AF_INET;
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dest_addr.sin_port = htons(port);
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if ((inet_aton(hostname, &dest_addr.sin_addr)) == 0) {
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hp = gethostbyname(hostname);
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if (!hp)
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return -1;
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memcpy ((char *) &dest_addr.sin_addr, hp->h_addr, hp->h_length);
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}
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udp_socket = socket(PF_INET, SOCK_DGRAM, 0);
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if (udp_socket < 0)
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return -1;
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my_addr.sin_family = AF_INET;
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my_addr.sin_port = htons(local_port);
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my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
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/* the bind is needed to give a port to the socket now */
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if (bind(udp_socket,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
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goto fail;
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/* limit the tx buf size to limit latency */
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tmp = UDP_TX_BUF_SIZE;
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if (setsockopt(udp_socket, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
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perror("setsockopt sndbuf");
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goto fail;
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}
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s = malloc(sizeof(UDPContext));
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if (!s)
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return -ENOMEM;
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h->priv_data = s;
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s->udp_socket = udp_socket;
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h->packet_size = 1500;
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return 0;
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fail:
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return -EIO;
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}
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int udp_close(URLContext *h)
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{
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UDPContext *s = h->priv_data;
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close(s->udp_socket);
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return 0;
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}
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int udp_write(URLContext *h, UINT8 *buf, int size)
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{
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UDPContext *s = h->priv_data;
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int ret, len, size1;
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/* primitive way to avoid big packets */
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size1 = size;
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while (size > 0) {
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len = size;
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if (len > h->packet_size)
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len = h->packet_size;
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ret = sendto (s->udp_socket, buf, len, 0,
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(struct sockaddr *) &dest_addr,
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sizeof (dest_addr));
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if (ret < 0)
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perror("sendto");
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buf += len;
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size -= len;
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}
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return size1 - size;
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}
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URLProtocol udp_protocol = {
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"udp",
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udp_open,
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NULL, /* read */
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udp_write,
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NULL, /* seek */
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udp_close,
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};
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