Inside Macintosh: QuickTime Components /

Chapter 8 - Video Digitizer Components / Video Digitizer Components Reference

Video Digitizer Component Functions / Controlling Compressed Source Devices

VDSetTimeBase

The VDSetTimeBase function allows an application to establish the video digitizer's time coordinate system.

pascal VideoDigitizerError VDSetTimeBase 
                                    (VideoDigitizerComponent ci, 
                                     TimeBase t);

ci

Identifies the application's connection to the video digitizer component. An application obtains this value from the Component Manager's OpenComponent function.

t

Specifies the video digitizer's new time base.

DESCRIPTION

Video digitizers return all time information in relation to the specified time base. For example, whenever a digitizer returns a compressed frame from its VDCompressDone function, it returns time information relating to the time when the frame was digitized and compressed. This time information is expressed in the time base that the application specifies with this function.

RESULT CODES

noErr	0	No error
digiUnimpErr	-2201	Function not supported