[FFmpeg-devel] select interface for multicast messages

[Tudor SUCIU]

some relevant code from vlc src/network/udp.c :

#ifdef WIN32
#   define if_nametoindex( str ) atoi( str )
#else
#   include <unistd.h>
#   ifdef HAVE_NET_IF_H
#       include <net/if.h>
#   endif
#endif

#if defined (WIN32) && !defined (MCAST_JOIN_SOURCE_GROUP)
#  warning Your C headers are out-of-date. Please update.

#ifdef MCAST_JOIN_SOURCE_GROUP
...
setsockopt (fd, level,
                    src ? MCAST_JOIN_SOURCE_GROUP : MCAST_JOIN_GROUP,
#endif


If I understand well the code, under windows it does not work
completely, the setsockopt ( MCAST_JOIN_GROUP) works with a recent
compiler, but the string --miface=br0.2222 for example does not pass
the  if_nametoindex function. Maybe if the number of the interface is
used --miface=5 it works. I have access to multicast udp only from
linux machines, I cannot immediately help with windows debugging. We
may try to setup a windows machine if it is indispensable for the
inclusion of the patch.


On Tue, Jan 3, 2012 at 4:37 AM, Michael Niedermayer <michaelni at gmx.at> wrote:
On Tue, Jan 3, 2012 at 4:37 AM, Michael Niedermayer <michaelni at gmx.at> wrote:
> On Mon, Jan 02, 2012 at 03:51:08PM +0100, Tudor SUCIU wrote:
>> By duplicate I meant the functionality, not the code. All the patch is
>> just a big function call in order to MCAST_JOIN_GROUP so I don't think
>> there is any copyright to be discussed.
>>
>> I don't know the implications of +#include <net/if.h> for windows
>> builds. Maybe it needs to be put in network.h, I need an input from
>> the list for this point.
>
> how does vlc handle it ?
> does it include that header unconditionally ?
>
> [...]
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
> Why not whip the teacher when the pupil misbehaves? -- Diogenes of Sinope
>
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