dont waste your time.... There is no PS4 emulator and wont be one for at least another decade. the PS3 emulator is in its infancy stages now and basically only plays the crappiest kiddie games...
Ps3 emulator is very early stage not really worth it. Ps4 is not happening for another few years. If you want to go the legal way sony has a service that will stream ps3 games to pc for a monthly fee. Not sure if it also supports ps4