User`s guide

4 Defining Your Adaptor Class
4-10
Because the ID is not exposed to users, you can specify any convenient value. For
example, if the device's SDK uses numerical identifiers to indicate a video source, use
these values for your source IDs.
For example, this code specifies a video source.
sourceContainer->addAdaptorSource("MyDeviceSource",1)
You can use IVideoSourceInfo member functions to perform many tasks, such as
determining the currently selected source. For more information about this class, see the
Image Acquisition Toolbox Adaptor Kit API Reference documentation.