[FFmpeg-devel] [PATCH] UDP IGMPv3 source specific multicast and source blocking

[Martin Storsjö]

Hi,

On Mon, 13 Sep 2010, Stephen D'Angelo wrote:

> Attached is a patch to add support for IGMPv3 source specific multicast
> and multicast source blocking.
> 
> It currently uses a URL format of:
> 
> udp://232.0.0.1:1234?include=1&sources=192.168.0.1,192.168.0.2,192.168.0
> .3
> 
> Where "include" specifies whether we allow (1) or block (0) the
> comma-separated list of IP addresses.  I'm completely open to formatting
> this in some other way.
> 
> Also, I am currently storing an array of 32 char * within the UDPContext
> for the list of sources.  Does FFMPEG have any utility functions for
> dynamically creating lists?  Though some z/OS documentation provided by
> IBM
> (http://publib.boulder.ibm.com/infocenter/zos/v1r10/topic/com.ibm.zos.r1
> 0.hala001/f1a1d47031.htm#wq94) states that the maximum number of sources
> is 20 for UDP sockets anyway, so maybe an array of 20 will do.
> 
> I have only tested this in Linux.

I'm forwarding this to Luca A, who's currently offline and not subscribed 
but will be back next week - I hope he has better knowledge on the UDP 
multicast stuff than I have.

// Martin