Just for your learning (which I don't think you will try), I am refering to an assembly code for RC-5 remote control decode algorithm.

RC-5 Remote Control Decode Algorithm

Let's see if you can understand it and adapt for your applications.

BTW: M. Karas has already told you the right direction. You must have followed his advice. If you don't understand what the state machines are, then sit back, relax and spend few days reading a good text book on digital logic.