Audio Spectrum FFT (C++/SFML)

Yo ! Back from a long trip in the US, I’ve coded my own implementation of the Short Time Fast Fourier Transform algorithm with C and SFML. It allows to extract the frequency information from the music, which is very useful for analysis, music visualization, filters and much more. Here, I’ve tried to come up with the best looking spectrum viewer I could achieve with simple functions. It’s crazy how you can track every single instrument in every song ! Source code and .exe :