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audio: SN76496 fixes

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This commit is contained in:
kub 2020-04-24 19:05:27 +02:00
parent fe43bdc334
commit 70aecd15b0
5 changed files with 43 additions and 10 deletions
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8
pico/sound/sn76496.c
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@ -173,9 +173,12 @@ void SN76496Update(short *buffer, int length, int stereo)
/* If we exit the loop in the middle, Output[i] has to be inverted */
/* and vol[i] incremented only if the exit status of the square */
/* wave is 1. */
left = 0;
while (R->Count[i] <= 0)
{
R->Count[i] += R->Period[i];
if (R->Count[i] + R->Period[i]*4 < R->Period[i])
left+= 4, R->Count[i] += R->Period[i]*4;
else left++, R->Count[i] += R->Period[i];
if (R->Count[i] > 0)
{
R->Output[i] ^= 1;
@ -186,6 +189,9 @@ void SN76496Update(short *buffer, int length, int stereo)
vol[i] += R->Period[i];
}
if (R->Output[i]) vol[i] -= R->Count[i];
/* Cut of anything above the sample freqency. It will only create */
/* aliasing and hearable distortions anyway. */
if (left > 1) vol[i] = STEP/2;
}
left = STEP;