I want to be able to do audio sample rate conversions; therefore, I came across this library on the internet. Does anyone know how to use this and give an example? I'm currently reading through the comments in the header file, but I just don't seem understand or comprehend what I'm reading.

https://github.com/marton78/pffft

PS: There does not seem to be a category for audio programming on gamedev; closest match is math.