Inside Macintosh: QuickTime Components /

Chapter 8 - Video Digitizer Components / Video Digitizer Components Reference

Video Digitizer Component Functions / Utility Functions

VDGetFieldPreference

The VDGetFieldPreference function allows applications to determine which field is being used in cases where the image is vertically scaled to half its original size.

pascal VideoDigitizerError VDGetFieldPreference
                                    (VideoDigitizerComponent ci,
                                     short *fieldFlag);

ci

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

fieldFlag

Points to a field that is to receive a value indicating which field is being used. Valid values are

vdUseAnyField

Digitizer component decides which field to use

vdUseOddField

Digitizer component uses odd field

vdUseEvenField

Digitizer component uses even field

DESCRIPTION

Video digitizer components can use either the odd-line field or the even-line field.
All video digitizer components must support this function.

RESULT CODES

noErr	0	No error
qtParamErr	-2202	Invalid parameter value

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