Shelby,
There are several programs that do this, the one I have is called DVmonitor Pro. It works very well with a Mackbook, I use it for casting, saves a boatload of time as it allows you to name clips as you shoot them and stuffs them in a hard drive. Not sure how it will work with your switcher, but it should. Another is VeeScope Live, which also can handle HDV. I have the demo, it’s pretty cool.
Have a wonderful day.