Question: Camera driver with DirectShow

Hello everybody,

I am a beginner in writting drivers. Now I am writting the camera
driver on Magneto. I have some questions, and I hope that you could
give some advices to me.

As we know, the new feature is that the camera co-work with DirectShow.
(A) If I follow the sample codes in the public directory
(\PUBLIC\COMMON\OAK\DRIVERS\CAPTURE\), the camera would work with
setting the properties correctly. In the driver, does it need I2C to
read/wrtie data when the upper layer of DirectShow called the driver?
and does it extral actions to make it work normal(i.e., preview,
capture the picture correctly)?

(B) do I have to port the filters for the camera? or just port the
camera driver with Microsoft specifications?

(C) should I develop a application to test my developed driver? or Are
there others' applications to test it?

Thanks to everybody who takes time to answer me.

GodzillaHaur