Where do I find AudioHardware.cpp for the Nexus One?

Googling for Nexus One AudioHardware.cpp yields lots of results but none brings the actual source file as can easil开发者_C百科y found for other phones (e.g. Vogue or msm7k).

If possible, I would like to find both the stock (Google's official) version and the CyanogenMod one.

Pointers to exact locations would be very much appreciated.