Analyze “whistle” sound for pitch/note

Question

I am trying to build a system that will be able to process a record of someone whistling and output notes.

Can anyone recommend an open-source platform which I can use

Answer 1

in addition to the other great options:

• csound pitch detection: http://www.csounds.com/manual/html/pvspitch.html
• fmod: http://www.fmod.org/ (has a free version)
• aubio: http://aubio.org/doc/pitchdetection_8h.html