SampleToWav

Converts sampled audio data inside ROM files to a WAV file

This is a small program which allows you to convert data stored in binary files (initially targetting ROM images for Sega 8-bit home video game systems) into minimally-adjusted WAV representations of the same data.

This covers three aspects:

Data extraction

Currently supported formats are:

• 4-bit SN76489 volume control data (stored in big-endian or little-endian order)
• 8-bit unsigned PCM data
• 1-bit PDM data (stored in big-endian or little-endian order)

Data conversion to linear PCM

Current adjustments are:

• Convert SN76489 volume control values (attenuation at 2dB per step) to linear PCM
• Pass-through (treat source data as linear PCM)
• 8-bit data truncation to SN76489 volume control values (to match operation of some sample players)

Output conversion to WAV

Output formats are:

• 8-bit unsigned
• 16-bit signed
• 32-bit float

The sampling rate is entirely under the control of the user, subject to the WAV format's limitation of integer Hz values.