Is accessing the USB Video Class Extension Units supported in Metro Style App?

Question

Hi,

Is accessing USB Video Class Extension Units of a camera device allowed for a Metro style app? If yes, how to go about it.

Current desktop way of accessing it is through the DirectShow capture filter(through IBaseFilter interface) which is no longer supported in Metro style app as Media Foundation is being used instead.

Answer 1

Lim Kok Ann,

I am looking into this for you.

Best Wishes - Eric

Answer 2

Hi Eric,

Any update?

Regards,

Kok ann

Answer 3

Lim Kok Ann,

We have released a new sample that may be helpful:

http://code.msdn.microsoft.com/windowsapps/Metro-style-device-app-for-4f39b7bf

http://code.msdn.microsoft.com/windowshardware/Driver-MFT-Sample-34ecfecb

Best Wishes - Eric

Answer 4

Lim Kok Ann,

We have released a new sample that may be helpful:

http://code.msdn.microsoft.com/windowsapps/Metro-style-device-app-for-4f39b7bf

http://code.msdn.microsoft.com/windowshardware/Driver-MFT-Sample-34ecfecb

Best Wishes - Eric

Hi Eric,

Thanks for the update.

The above samples didn't mention anything about the accessing of USB Video Class Extension Units of a camera device. Current desktop way is using the IKsControl interface queried from the DirectShow video capturing filter. So, I would like to know whether it's possible to get this interface from a Metro style device app. If not possible then is it possible to get it from Driver MFT(alias MFT0) instead.

Regards,

Kok Ann

Answer 5

Kok Ann,

Accessing the USB Video Class Extension Units is not supported in a Metro style app.  IKsControlInterface is not available to Metro style apps.  Therefore it is not allowed to circumvent this requirement by using the MFT0.

Best Wishes - Eric