The toolbox defines a video source as one or more hardware inputs that are treated as a single entity. For example, an image acquisition device might support an RGB source that is made up of three physical connections. The toolbox would treat the three connections as a single video source. Read the documentation that came with your device to determine the video sources it supports.
When a user creates a video input object, the toolbox engine
automatically creates a video source object for each source supported
by an adaptor. The
Source property of the video
input object lists the available video sources. The video source object
that is used to acquire data is called the currently selected video
source. By default, the toolbox engine uses the first video source
you define as the selected source, but users can switch the selected
source by setting the value of the video input object's
must define all the properties and sources of video data you want
to make available to users. This section only covers defining video
sources, which means determining the text labels used to identify
the available video sources. For information about making device properties
available to users, see Defining Device-Specific Properties.
Note Every adaptor must specify at least one video source; otherwise, you cannot create a video input object if a video source has not been specified.
You use the
addAdaptorSource() member function
IVideoSourceInfo object that the toolbox
engine passes to your adaptor's
to define a video source. You specify the following two arguments:
Name you want to assign to the source
ID you want to assign to the source
The name is visible to users. Choose a name that clearly identifies
the source. If the device vendor assigns names to the sources, you
can use the same names. For example, Matrox some devices identify
video sources by the labels
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.
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.