QuickTime 4 Reference

Selecting a Video Output Component

Listing 1 shows how to assemble a list of available video output components using the FindNextComponent function. This list can then be presented to the user.

The base video output component is a special component that provides services to other video output components. It is never connected to a display, and it has a component flag, kQTVideoOutputDontDisplayToUser , that indicates that it should not be included in a list of available video output components. The sample code shows how to check for this flag.

Listing 1 Displaying available video output components



 
ComponentDescription cd;

Component c = 0;



cd.componentType = QTVideoOutputComponentType;

cd.componentSubType = 0;

cd.componentManufacturer = 0;

cd.componentFlags = 0;

cd.componentFlagsMask = kQTVideoOutputDontDisplayToUser;



while (c = FindNextComponent (c, &cd)) {

    Handle nameHandle = NewHandle (0);



    GetComponentInfo (c, &cd, nameHandle, nil, nil);



    // add name to list



    DisposeHandle (nameHandle);

}