QuickTime 4 Reference

Ending Video Output

Listing 6 shows how your video output component can stop video output. The implementation of this function is similar to the implementation of QTVideoOutputEnd , but here the default implementation must be called after the hardware has been released.

Listing 6 Ending video output



 
pascal ComponentResult MyQTVideoOutputEnd (Globals storage)

{

    ComponentResult err;



    // check that Begin has been called

    if (storage->ownHardware == false) {

        err = paramErr;

        goto bail;

    }



    // release the hardware



    // call default implementation

    QTVideoOutputEnd (storage->baseVideoOutput);



    // remember that we no longer own the hardware

    store->ownHardware = false;



bail:

    return err;

}

In the implementation of QTVideoOutputEnd , your component should also display a default image on the video output device to indicate that the device is no longer in use by other software.