QuickTime 4 Reference

Exporting Data from Sources Other Than Movies

A movie data export component can be written to export data from sources other than QuickTime movies. To do this, the software that exports data must implement callback functions that provide services to the movie data export component. The callback functions and other functions that support this feature are described in this section.

The export component's MovieExportFromProceduresToDataRef routine performs data exporting. When executed, that routine makes callbacks to retrieve characteristics--called properties--and media data from each data source. Characteristics for a video data source might include the width, height, and image compression settings to be used; the media data would be the image description and image data corresponding to a particular movie time. A sound data source would have sound-related characteristics and sound sample data.

An application follows these basic steps to export data:

Find an exporter for the format that implements MovieExportFromProceduresToDataRef.
Open that export component.
For each data source , call the export component's MovieExportAddDataSource to provide the property and data callbacks that the exporter should call during export.
Call MovieExportFromProceduresToDataRef to perform the export.

Exporting Data from Sources Other Than Movies

Determining What Kind of Tracks a Component Supports

Using a Movie Data Export Component to Export Audio

Using a Movie Data Export Component to Export Video