Re: Detecting Available Resolutions Part Deux

From: Iain (idownsXXXX_at_dircon.co.uk)
Date: 03/16/04 

Date: Tue, 16 Mar 2004 14:51:07 -0000

There are 2 ways of getting this information.

With older drivers - Video For Windows - you have the choice of the dialog
or nothing.

with newer drivers WDM compliant there is (usually? always?) an interface
IAMStreamConfig defined which lets you enumerate formats..

The way I tackled the VFW mess is simply to prepare a list of formats that
the device MIGHT support and attempt to set them.

If this succeeded I ticked the format and could use it in a selection list.

Iain
"Jon Evans" <anonymous@discussions.microsoft.com> wrote in message
news:BFA26C28-345D-46B2-8C66-BA1EB0F9162D@microsoft.com...
> I have a capture device that if you bring up the properties of its pin you
get a dialog with 16 different resolutions available.
>
> Programatically I can get the capture device's capabilities, but according
to them there are only 3 resolutions.
>
> I know I've posted a similar question recently, so am I now correct in
assuming that it is IMPOSSIBLE programatically build your own list of such
resolutions ?
>
> Maybe I'm tackling this the wrong way. Is it possible to save the entire
config of a capture device and then force it to use that config next time
your app starts e.g. a service engineer initially configures the system,
goes away and from then on every time the app starts (after a power cut for
example) the app will use the engineers settings ? Or should I be using
something other than DirectShow for industrial applications ?
>
> TTFN,
> Jon

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