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Fix Pcm8 conversions #2
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Rationale:
8-bit PCM is unsigned with a midpoint value 128 (0x80), per 3-24 of http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/Docs/riffmci.pdf
How to reproduce:
Compare playback of any 8-bit PCM stream between "Internal Audio Renderer" and e.g. "Default DirectSound device", treating unsigned as signed introduces severe distortion.