Surface Context
A MultiCam integer parameter called SurfaceContext is available. This parameter is not written or read by the MultiCam driver. It is included for user's convenience.
Typically, the user assigns to this parameter an indexing information of its own. This assignment occurs after the surface instantiation and before the acquisition process.
After acquisition of a frame or a page, the SignalInfo member of the signal information structure directly designates the surface that experienced the acquisition. It is just a matter of getting the corresponding SurfaceContext parameter to get back the indexing information previously provided.
This greatly eases any surface filling sequence control the user may need to implement.