Update from the introwerks Rutt Etra Emulator for Processing. Now you can use it with your PC camera or external cameras. Also, you can send video via Spout. It's also sound reactive.
For using the sketch with a DSLR or another external camera, you can use SparkoCam as a virtual camera.
Pierre Puentes, aka DRLZTN, 2016
(Currently working on a MaxMSP patch to connect other audio inputs to processing via OSC)