Text Channel Components

Text channel components are a new type of sequence grabber channel component, added as part of QuickTime 2.5. A text channel component captures text for use in QuickTime movies, and is controlled by a sequence grabber component. Applications programmers will normally interact with the higher-level sequence grabber component, and do not need to read this chapter.

Text channel components make use of text digitizer components, which digitze text from particular sources, such as the closed-caption text from a video input. Text channel components abstract this level of detail, allowing the sequence grabber component to work with a stream of text, without regard to its source.

You should read this chapter if you are developing a text channel component, a text digitizer, or a sequence grabber component.

For related information, see the chapters "Sequence Grabber Components," "Sequence Grabber Channel Components," and "Sequence Grabber Panel Components."

About the Text Channel Component

QuickTime 4 Reference introduces the text channel component and text digitizer concepts. This section also lists the sequence grabber channel functions that are supported by text channel components. Not all channel functions are supported.

Text Channel Component Functions

QuickTime 4 Reference defines the channel component functions that are unique to text channel components. These functions allow captured text to be formatted prior to being previewed or added to a movie.