Video Digitizer Component Functions

This section describes the functions that are provided by video digitizer components. These functions are described from the perspective of an application that uses video digitizer components. If you are developing a video digitizer component, your digitizer component must behave as described here.

This section has been divided into the following topics:

"Getting Information About Video Digitizer Components" describes the functions that allow applications to obtain information about the capabilities of video digitizer components.
"Setting Source Characteristics" discusses the video digitizer functions that allow applications to establish the source video environment.
"Selecting an Input Source" describes how applications select the input video source.
"Setting Video Destinations" describes the functions that allow applications to establish the destination display environment.
"Controlling Compressed Source Devices" describes the functions that allow applications to work with devices that return compressed image data.
"Controlling Digitization" describes functions that allow applications to start and stop digitization.
"Controlling Color" discusses the functions that allow applications to control color mapping in the video digitizer component.
"Controlling Analog Video" describes several functions that allow applications to control the characteristics of the input analog video signal.
"Selectively Displaying Video" discusses functions that allow applications to work with the key colors that are used to control video display.
"Clipping" discusses functions that allow applications to control the clipping region used by video digitizer components.
"Utility Functions" describes a few utility functions that are supported by video digitizer components.

If you are developing an application that uses video digitizer components, you should read the sections that are appropriate to your application. If you are developing a video digitizer component, you should read all the sections.

These functions specify the video digitizer components for their requests with a reference obtained from the Component Manager's OpenComponent function. See the chapter "Component Manager" in Inside Macintosh: More Macintosh Toolbox for details.