How do you analyse the fundamental frequency of a PCM or WAV sample?

Question

I have a sample held in a buffer from DirectX. It's a sample of a note played and captured from an instrument. How do I analyse the frequency of the sample (like a guitar tuner does)? I believe FFTs are involved, but I have no pointers to HOWTOs.

Answer 1

What I would do is use a spectragram to show the various frequencies that make up your sample. The lowest frequency is going to be your fundamental.