Inside Macintosh: QuickTime Components /

Chapter 8 - Video Digitizer Components / Video Digitizer Components Reference

Video Digitizer Component Functions / Controlling Analog Video

VDSetWhiteLevelValue

The VDSetWhiteLevelValue function sets the 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 VDSetWhiteLevelValue
                            (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 contains the new white level value. The video digitizer component attempts to set the white level value to the value specified by this parameter. The digitizer component returns the new value, so that the application can avoid using unsupported values in future requests.

RESULT CODES

noErr	0	No error
digiUnimpErr	-2201	Function not supported
qtParamErr	-2202	Invalid parameter value

SEE ALSO

Applications can get the current white level value by calling the VDGetWhiteLevelValue function (described in the next section). Applications can obtain the recommended white level value by calling the VDGetVideoDefaults function (described on page 8-66).

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