mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-25 16:52:31 +00:00
better UDP support - added preliminary multicast support (untested)
Originally committed as revision 793 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
parent
85fb7b3490
commit
2d225591e9
271
libav/udp.c
271
libav/udp.c
@ -1,6 +1,6 @@
|
||||
/*
|
||||
* UDP prototype streaming system
|
||||
* Copyright (c) 2000 Fabrice Bellard.
|
||||
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
|
||||
*
|
||||
* This library is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU Lesser General Public
|
||||
@ -25,118 +25,233 @@
|
||||
#include <netdb.h>
|
||||
|
||||
typedef struct {
|
||||
int udp_socket;
|
||||
int max_payload_size; /* in bytes */
|
||||
int udp_fd;
|
||||
int ttl;
|
||||
int is_multicast;
|
||||
int local_port;
|
||||
struct ip_mreq mreq;
|
||||
struct sockaddr_in dest_addr;
|
||||
} UDPContext;
|
||||
|
||||
#define UDP_TX_BUF_SIZE 32768
|
||||
|
||||
/* put it in UDP context */
|
||||
static struct sockaddr_in dest_addr;
|
||||
/**
|
||||
* If no filename is given to av_open_input_file because you want to
|
||||
* get the local port first, then you must call this function to set
|
||||
* the remote server address.
|
||||
*
|
||||
* url syntax: udp://host:port[?option=val...]
|
||||
* option: 'multicast=1' : enable multicast
|
||||
* 'ttl=n' : set the ttl value (for multicast only)
|
||||
* 'localport=n' : set the local port
|
||||
*
|
||||
* @param s1 media file context
|
||||
* @param uri of the remote server
|
||||
* @return zero if no error.
|
||||
*/
|
||||
int udp_set_remote_url(URLContext *h, const char *uri)
|
||||
{
|
||||
UDPContext *s = h->priv_data;
|
||||
char hostname[256];
|
||||
int port;
|
||||
|
||||
url_split(NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
|
||||
|
||||
/* set the destination address */
|
||||
if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
|
||||
return -EIO;
|
||||
s->dest_addr.sin_family = AF_INET;
|
||||
s->dest_addr.sin_port = htons(port);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Return the local port used by the UDP connexion
|
||||
* @param s1 media file context
|
||||
* @return the local port number
|
||||
*/
|
||||
int udp_get_local_port(URLContext *h)
|
||||
{
|
||||
UDPContext *s = h->priv_data;
|
||||
return s->local_port;
|
||||
}
|
||||
|
||||
/**
|
||||
* Return the udp file handle for select() usage to wait for several RTP
|
||||
* streams at the same time.
|
||||
* @param h media file context
|
||||
*/
|
||||
int udp_get_file_handle(URLContext *h)
|
||||
{
|
||||
UDPContext *s = h->priv_data;
|
||||
return s->udp_fd;
|
||||
}
|
||||
|
||||
/* put it in UDP context */
|
||||
/* 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;
|
||||
struct sockaddr_in my_addr, my_addr1;
|
||||
char hostname[1024];
|
||||
int port, udp_socket, tmp;
|
||||
struct hostent *hp;
|
||||
UDPContext *s;
|
||||
int port, udp_fd = -1, tmp;
|
||||
UDPContext *s = NULL;
|
||||
int is_output, len;
|
||||
const char *p;
|
||||
char buf[256];
|
||||
|
||||
h->is_streamed = 1;
|
||||
|
||||
if (!(flags & URL_WRONLY))
|
||||
return -EIO;
|
||||
is_output = (flags & URL_WRONLY);
|
||||
|
||||
/* 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;
|
||||
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);
|
||||
|
||||
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;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
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)
|
||||
close(udp_fd);
|
||||
av_free(s);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
int udp_close(URLContext *h)
|
||||
static int udp_read(URLContext *h, UINT8 *buf, int size)
|
||||
{
|
||||
UDPContext *s = h->priv_data;
|
||||
close(s->udp_socket);
|
||||
return 0;
|
||||
struct sockaddr_in from;
|
||||
int from_len, len;
|
||||
|
||||
for(;;) {
|
||||
from_len = sizeof(from);
|
||||
len = recvfrom (s->udp_fd, buf, size, 0,
|
||||
(struct sockaddr *)&from, &from_len);
|
||||
if (len < 0) {
|
||||
if (errno != EAGAIN && errno != EINTR)
|
||||
return -EIO;
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
return len;
|
||||
}
|
||||
|
||||
int udp_write(URLContext *h, UINT8 *buf, int size)
|
||||
static int udp_write(URLContext *h, UINT8 *buf, int size)
|
||||
{
|
||||
UDPContext *s = h->priv_data;
|
||||
int ret, len, size1;
|
||||
int ret;
|
||||
|
||||
/* 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;
|
||||
for(;;) {
|
||||
ret = sendto (s->udp_fd, buf, size, 0,
|
||||
(struct sockaddr *) &s->dest_addr,
|
||||
sizeof (s->dest_addr));
|
||||
if (ret < 0) {
|
||||
if (errno != EINTR && errno != EAGAIN)
|
||||
return -EIO;
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
return size1 - size;
|
||||
return size;
|
||||
}
|
||||
|
||||
static int udp_close(URLContext *h)
|
||||
{
|
||||
UDPContext *s = h->priv_data;
|
||||
|
||||
if (s->is_multicast && !(h->flags & URL_WRONLY)) {
|
||||
if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
|
||||
&s->mreq, sizeof(s->mreq)) < 0) {
|
||||
perror("IP_DROP_MEMBERSHIP");
|
||||
}
|
||||
}
|
||||
close(s->udp_fd);
|
||||
av_free(s);
|
||||
return 0;
|
||||
}
|
||||
|
||||
URLProtocol udp_protocol = {
|
||||
"udp",
|
||||
udp_open,
|
||||
NULL, /* read */
|
||||
udp_read,
|
||||
udp_write,
|
||||
NULL, /* seek */
|
||||
udp_close,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user