How to find the fundamental frequency of a guitar string sound?

Question

I want to build a guitar tuner app for Iphone. My goal is to find the fundamental frequency of sound generated by a guitar string. I have used bits of code from aurioTouch s

Answer 1

Use libaubio (link) and be happy . It was one the biggest time lose for me to try to implement a fundemental frequency estimator. If you want to do it yourself I advise you follow to YINFFT method (link)