Controlling Sequence Grabber Channel Components(IM: QC)

Inside Macintosh: QuickTime Components /

Chapter 6 - Sequence Grabber Channel Components / Sequence Grabber Channel Components Reference

Controlling Sequence Grabber Channel Components
Sequence grabber channel components must provide a full set of functions that allow
the sequence grabber component to control the preview or record operation. The sequence grabber component can use these functions to start and stop the operation, to pause data collection, and to write captured data to a movie. This section describes these functions.
The sequence grabber component uses the SGStartPreview function to start a preview operation. The SGStartRecord function starts a record operation. The SGStop function stops your channel component after a preview or record operation.
The sequence grabber component grants processing time to your channel component
by calling the SGIdle function. The sequence grabber notifies you of update events by calling your SGUpdate function.
The sequence grabber pauses the current operation by calling the SGPause function.
The sequence grabber component calls your SGWriteSamples function to write captured data to a movie file after a record operation.
The sequence grabber component prepares your channel component for an upcoming preview or record operation by calling the SGPrepare function. This function also allows the sequence grabber component to verify that your component can support the parameters an application has specified. The SGRelease function releases system resources allocated during the SGPrepare function.

Subtopics

SGStartPreview

SGStartRecord

SGIdle

SGUpdate

SGStop

SGWriteSamples

SGPause

SGPrepare

SGRelease