QuickTime 3 Reference
To use the services of the base image decompressor, your image decompressor component must support functions that the base image decompressor calls when necessary. The following sections explain when the base image decompressor calls these functions and how your image decompressor component must respond. These sections also list standard image decompressor calls that your image decompressor must handle itself rather than delegate.
The base image decompressor and image decompressor components are managed by the Component Manager. See the "Component Manager" chapter in Inside Macintosh: More Macintosh Toolbox for more information about the Component Manager and how to use components.