mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-11 09:35:22 +00:00
144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/*
|
|
* UDP prototype streaming system
|
|
* Copyright (c) 2000 Fabrice Bellard.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include "avformat.h"
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <netdb.h>
|
|
|
|
typedef struct {
|
|
int udp_socket;
|
|
int max_payload_size; /* in bytes */
|
|
} UDPContext;
|
|
|
|
#define UDP_TX_BUF_SIZE 32768
|
|
|
|
/* put it in UDP context */
|
|
static struct sockaddr_in dest_addr;
|
|
|
|
/* return non zero if error */
|
|
static int udp_open(URLContext *h, const char *uri, int flags)
|
|
{
|
|
int local_port = 0;
|
|
struct sockaddr_in my_addr;
|
|
const char *p, *q;
|
|
char hostname[1024];
|
|
int port, udp_socket, tmp;
|
|
struct hostent *hp;
|
|
UDPContext *s;
|
|
|
|
h->is_streamed = 1;
|
|
|
|
if (!(flags & URL_WRONLY))
|
|
return -EIO;
|
|
|
|
/* fill the dest addr */
|
|
p = uri;
|
|
if (!strstart(p, "udp:", &p))
|
|
return -1;
|
|
q = strchr(p, ':');
|
|
if (!q)
|
|
return -1;
|
|
memcpy(hostname, p, q - p);
|
|
hostname[q - p] = '\0';
|
|
port = strtol(q+1, NULL, 10);
|
|
if (port <= 0)
|
|
return -1;
|
|
|
|
dest_addr.sin_family = AF_INET;
|
|
dest_addr.sin_port = htons(port);
|
|
if ((inet_aton(hostname, &dest_addr.sin_addr)) == 0) {
|
|
hp = gethostbyname(hostname);
|
|
if (!hp)
|
|
return -1;
|
|
memcpy ((char *) &dest_addr.sin_addr, hp->h_addr, hp->h_length);
|
|
}
|
|
|
|
udp_socket = socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (udp_socket < 0)
|
|
return -1;
|
|
|
|
my_addr.sin_family = AF_INET;
|
|
my_addr.sin_port = htons(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_socket,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
|
|
goto fail;
|
|
|
|
/* limit the tx buf size to limit latency */
|
|
|
|
tmp = UDP_TX_BUF_SIZE;
|
|
if (setsockopt(udp_socket, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
|
|
perror("setsockopt sndbuf");
|
|
goto fail;
|
|
}
|
|
|
|
s = av_malloc(sizeof(UDPContext));
|
|
if (!s)
|
|
return -ENOMEM;
|
|
h->priv_data = s;
|
|
s->udp_socket = udp_socket;
|
|
h->packet_size = 1500;
|
|
return 0;
|
|
fail:
|
|
return -EIO;
|
|
}
|
|
|
|
int udp_close(URLContext *h)
|
|
{
|
|
UDPContext *s = h->priv_data;
|
|
close(s->udp_socket);
|
|
return 0;
|
|
}
|
|
|
|
int udp_write(URLContext *h, UINT8 *buf, int size)
|
|
{
|
|
UDPContext *s = h->priv_data;
|
|
int ret, len, size1;
|
|
|
|
/* primitive way to avoid big packets */
|
|
size1 = size;
|
|
while (size > 0) {
|
|
len = size;
|
|
if (len > h->packet_size)
|
|
len = h->packet_size;
|
|
|
|
ret = sendto (s->udp_socket, buf, len, 0,
|
|
(struct sockaddr *) &dest_addr,
|
|
sizeof (dest_addr));
|
|
if (ret < 0)
|
|
perror("sendto");
|
|
buf += len;
|
|
size -= len;
|
|
}
|
|
return size1 - size;
|
|
}
|
|
|
|
URLProtocol udp_protocol = {
|
|
"udp",
|
|
udp_open,
|
|
NULL, /* read */
|
|
udp_write,
|
|
NULL, /* seek */
|
|
udp_close,
|
|
};
|