Inside Macintosh: QuickTime Components /

Chapter 8 - Video Digitizer Components / Video Digitizer Components Reference

Video Digitizer Component Functions / Controlling Analog Video

VDGetWhiteLevelValue

The VDGetWhiteLevelValue function returns the current white level value. White level values range from 0 to 65,535, where 0 represents the minimum white value
and 65,535 represents the maximum white value.

pascal VideoDigitizerError VDGetWhiteLevelValue
                            (VideoDigitizerComponent ci,
                               unsigned short *whiteLevel);

ci

Specifies the video digitizer component for the request. Applications obtain this reference from the Component Manager's OpenComponent function.

whiteLevel

Contains a pointer to an integer that is to receive the current white level value. The video digitizer component places the white level value into the field referred to by this parameter.

RESULT CODES

noErr	0	No error
digiUnimpErr	-2201	Function not supported

SEE ALSO

Your application can set the white level value by calling the VDSetWhiteLevelValue function (described in the previous section). Your application can obtain the recommended white level value by calling the VDGetVideoDefaults function (described on page 8-66).

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