Inside Macintosh: QuickTime Components

Required Functions

Video digitizer components support a rich functional interface that can accommodate devices with quite varied capabilities. To relieve you from having to support irrelevant functions, Apple has made several video digitizer functions optional.

At a minimum, your video digitizer component must support the following functions:

VDGetActiveSrcRect	VDGetCurrentFlags
VDGetDigitizerInfo	VDGetDigitizerRect
VDGetFieldPreference	VDGetInput
VDGetInputFormat	VDGetMaxSrcRect
VDGetNumberOfInputs	VDGetPlayThruDestination
VDGetVBlankRect	VDGetVideoDefaults
VDGrabOneFrame	VDPreflightDestination
VDSetDigitizerRect	VDSetFieldPreference
VDSetInput	VDSetInputStandard
VDSetPlayThruDestination

All of these functions are required for all video digitizer components.

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