Inside Macintosh: QuickTime Components /

Chapter 5 - Sequence Grabber Components / Sequence Grabber Components Reference

Sequence Grabber Component Functions

Configuring Sequence Grabber Components

Sequence grabber components provide a number of functions that allow you to establish the environment for grabbing or previewing digitized data. Before you can start a record or a preview operation, you must initialize the sequence grabber component, establish the channels that will be used, define the display environment for the operation, and determine the optimum screen position for the sequence grabber. In addition, if you are performing a record operation, you must define a destination movie file. This section describes the sequence grabber component functions that allow you to perform these tasks.

You can use the SGInitialize function to initialize a sequence grabber component. Before you can call this function, you must establish a connection to the sequence grabber by calling the Component Manager's OpenDefaultComponent or OpenComponent function.

The SGNewChannel function allows you to create channels for the sequence grabber for an operation. You can use the SGNewChannelFromComponent function to create a new channel using a specified channel component. Use the SGDisposeChannel function to dispose of those channels that you are no longer using.

You can use the SGGetIndChannel function to retrieve information about the channels that are currently in use by the sequence grabber.

You can use the SGSetGWorld and SGGetGWorld functions to establish the display environment for the sequence grabber. These functions affect only those channels that work with data that has visual information.

The SGSetDataOutput and SGGetDataOutput functions allow you to identify the movie file that is currently assigned to the sequence grabber. You only use these functions when you are performing a record operation.

The SGSetDataProc function allows you to assign a data function to a channel. The sequence grabber calls your data function whenever it writes movie data to the
output file.

The SGGetAlignmentProc function allows you to determine a sequence grabber's optimum screen position to ensure the best performance and appearance.

---

Subtopics

SGInitialize

SGSetDataOutput

SGGetDataOutput

SGSetGWorld

SGGetGWorld

SGNewChannel

SGNewChannelFromComponent

SGGetIndChannel

SGDisposeChannel

SGSetDataProc

SGGetAlignmentProc

Main | Top of Section | What's New | Apple Computer, Inc. | Find It | Feedback | Help