Inside Macintosh: QuickTime Components /

Chapter 8 - Video Digitizer Components / Video Digitizer Components Reference

Video Digitizer Component Functions / Controlling Compressed Source Devices

VDCompressOneFrameAsync

The VDCompressOneFrameAsync function instructs the video digitizer to digitize and compress a single frame of image data. Because the component performs this action asynchronously, the application is free to do other things while the digitizer works on the image.

pascal VideoDigitizerError VDCompressOneFrameAsync 
                           (VideoDigitizerComponent ci);

ci

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

DESCRIPTION

An application can determine when the digitizer is done with the frame by calling the VDCompressDone function, which is discussed next.

Unlike the VDGrabOneFrameAsync function (discussed on page 8-56), the video digitizer handles all details of managing data buffers.

RESULT CODES

noErr	0	No error
digiUnimpErr	-2201	Function not supported

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