QuickTime 4 Reference

Creating an Input Map

The input map is another QTAtomContainer that you attach to the effects track. It describes the sources used in the effect and gives a name to each source. This name is used to refer to the source in the effect description.

An input map works in concert with track reference atoms in the source tracks. A track reference atom of type kTrackModifierReference is added to each source track, which causes that source track's output to be redirected to the effects track. An input map is added to the effects track to identify the source tracks and give a name to each source, such as 'srcA' and 'srcB' . The effect can then refer to the sources by name, specifying that 'srcB' should slide in over 'srcA' , for example.

Structure of an Input Map

Building Input Maps