Converts WAV data to SN76489 attenuation data with a novel algorithm to minimise quantisation error
This is a clone and minor tweak to a program by blargg which he posted at SMS Power!, without permission or licence. The program takes a WAV file and applies a low-frequency offset (pretty much dynamic DC offsetting) to make the "interesting" parts of the data coincide with the more densely-populated parts of the SN76489's possible output levels. It then quantises the data to those levels, to allow generation of sample data at higher perceived quality than a simple unadjusted quantisation.