QuickTime 4 Reference
Binding a tween entry to its receiving track

Listing 5 Binding a tween entry to its receiving track


 
QTAtomContainer inputMap = nil;



// create an atom container to hold the input map

if (QTNewAtomContainer (&inputMap) == noErr) 

{

    QTAtom inputAtom;

    OSType inputType;

    long tweenID = 1;



    // create a kTrackModifierInput atom 

    // whose ID is referenceIndex

    QTInsertChild(inputMap, kParentAtomIsContainer, 

        kTrackModifierInput, referenceIndex, 0, 0, nil,

        &inputAtom);



    // add a child atom of type kTrackModifierTypeVolume

    inputType = EndianU32_NtoB(kTrackModifierTypeVolume);

    QTInsertChild (inputMap, inputAtom, kTrackModifierType, 1, 0,

       sizeof(inputType), &inputType, nil);



    // add a child atom for the ID of the tween to 

    // modify the volume

    QTInsertChild (inputMap, inputAtom, kInputMapSubInputID, 1,

        0, sizeof(tweenID), &tweenID, nil);



    // assign the input map to the sound media

    SetMediaInputMap(GetTrackMedia(soundTrack), inputMap);



    // dispose of the input map

    QTDisposeAtomContainer(inputMap);

}