In my previous post I just mentioned how we can use ARToolkit in conjunction with a 3D rendering engine. The camera connection was made by the ARToolkit via DSVL (DirectShow Video Library) . As I promised, through this post, I’ll expose how we can configure DSVL with its supported parameters.
DSVL is a wrapper for DirectShow which in turn is a part of DirectX. We all know that DirectX is the prominent media framework used in windows platforms. Other than DirectShow, Direct3D and DirectSound also come under the brotherhood of DirectX. So what is the specialty of DirectShow? In computers data can be generated in many places, such as file system, network, TV cards or video cameras etc. And data which is produced at each of these locations take many formats. Therefore front-end applications have to explicitly communicate with these underlying data sources and deal with its formats. Obviously this would be pretty cumbersome and overwhelmingly incompatible with different hardware devices. This is where DirectShow comes in to handy. It synchronizes and unifies all the communication flow between our application and the underlying hardware. In particular DirectShow talks directly with the camera drivers, capture card drivers etc… and provide feedback for the user application. This is the simplest way we can understand it, but for more details go here http://msdn.microsoft.com/en-us/library/windows/desktop/dd375454(v=vs.85).aspx .