Re: [hatari-devel] Cracks in the sound (YM+DMA)

[David Savinkoff <dsavnkff@xxxxxxxxx>]

Hi Nicolas,

This patch has sound clipping for LMC1992 saturation distortion
(same code as before for expedience, change it to your liking).
See hunk at line 642 (dmaSnd.c).

This patch also fixes the sound overflow when DMA samples and
YM2149 are summed on the STe.
See all other hunks.

The sound overflow fix incurs no performance penalty because
the YM2149 volume table is scaled by 1/2 in sound.c for the
STe; and the LMC1992 gain is doubled in dmaSnd.c to compensate
afterwards. DMA sound samples are scaled and summed
with 1/2 attenuated YM2149 to avoid overflow. DC filtering
removes the large dc offset before the gain is scaled up by 2.

David

Attachment: Sound.crack.patch
Description: Binary data