C++ Speech Recognition

Hi, I am looking to implement a speech recognition engine on a mobile/embedded device. You can use any speech engine you feel comfortable with. I looked into pocketSphinx, julius, and isip but couldn't understand how to implement them. if you know of a better, acurate engine please let me know of it with it's cost. It must follow the constraints below: - Must be in C++ - Must be cross platform - Must take in an audio file or stream and do processing - Must be lightweight on processing This is an area i know very little about. Any one who can help me understand the software process of speech recognition will be considered more favorably.