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udp: Allow specifying the connect option in udp_set_remote_url, too

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If the remote address is updated later with this function, the caller
shouldn't set the connect option until in this call.

Originally committed as revision 26245 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Martin Storsjö 2011-01-06 15:16:50 +00:00
parent babd19ce2e
commit 21a569f302
2 changed files with 21 additions and 1 deletions
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4
doc/protocols.texi
View File

@ -415,9 +415,13 @@ set the time to live value (for multicast only)
@item connect=@var{1|0}
Initialize the UDP socket with @code{connect()}. In this case, the
destination address can't be changed with udp_set_remote_url later.
If the destination address isn't known at the start, this option can
be specified in udp_set_remote_url, too.
This allows finding out the source address for the packets with getsockname,
and makes writes return with AVERROR(ECONNREFUSED) if "destination
unreachable" is received.
For receiving, this gives the benefit of only receiving packets from
the specified peer address/port.
@end table
Some usage examples of the udp protocol with @file{ffmpeg} follow.

18
libavformat/udp.c
View File

@ -245,8 +245,9 @@ static int udp_port(struct sockaddr_storage *addr, int addr_len)
int udp_set_remote_url(URLContext *h, const char *uri)
{
UDPContext *s = h->priv_data;
char hostname[256];
char hostname[256], buf[10];
int port;
const char *p;
av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
@ -256,6 +257,21 @@ int udp_set_remote_url(URLContext *h, const char *uri)
return AVERROR(EIO);
}
s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
p = strchr(uri, '?');
if (p) {
if (find_info_tag(buf, sizeof(buf), "connect", p)) {
int was_connected = s->is_connected;
s->is_connected = strtol(buf, NULL, 10);
if (s->is_connected && !was_connected) {
if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
s->dest_addr_len)) {
s->is_connected = 0;
av_log(NULL, AV_LOG_ERROR, "connect: %s\n", strerror(errno));
return AVERROR(EIO);
}
}
}
}
return 0;
}