Re: Crap: Really no programmatically filter control in DirectShow??

From: Geraint Davies (geraintd_at_gdcl.co.uk)
Date: 01/28/05 

Date: Fri, 28 Jan 2005 11:42:55 +0000

On Fri, 28 Jan 2005 11:19:52 +0100, Robin wrote:

>
> So I can only control these filters, where .h header files exist from the
> developers
> (like in a SDK), where you can get all the custom interfaces?

However much better COM is than what went before, it definitely has its
limitations, and this lack of a real discovery mechanism is one of them.

DirectShow does ensure that the property page talks to the filter via a COM
interface, but if that is not documented, there is not much you can do. For
third-party filters, you can only ask the developers -- but I think most of
these filter developers would be happy to provide you with the
documentation.

The idea of a generalised property interface is something that has been
wanting for a long time, but somehow has never made it into the release.

G

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