[FFmpeg-devel] select interface for multicast messages

[Tudor SUCIU]

if_nametoindex function  exists starting with vista
http://msdn.microsoft.com/en-us/library/windows/desktop/bb408409%28v=vs.85%29.aspx
GROUP_REQ structure exists starting with Win 2008 server
http://msdn.microsoft.com/en-us/library/windows/desktop/bb427440%28v=vs.85%29.aspx

Michael, you said "it must not break compilation". Does it mean that I
need to try a compile on WIN32 to see what it gives? If I consider
what msdn says, it means that it only works on Windows server 2008.

On Tue, Jan 3, 2012 at 4:03 PM, Michael Niedermayer <michaelni at gmx.at> wrote:
> On Tue, Jan 03, 2012 at 10:57:28AM +0100, Tudor SUCIU wrote:
>> 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 #  warning Your C headers are out-of-date.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.
>
> Theres no need to support windows if you dont have the ability to
> simply test it/work on it. But it must not break compilation.
>
> [...]
>
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
> It is dangerous to be right in matters on which the established authorities
> are wrong. -- Voltaire
>
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