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SPU: Do clamping after applying SOUNDBIAS

This commit is contained in:
Nadia Holmquist Pedersen 2021-08-17 00:34:23 +02:00
parent e2f3fa0581
commit dfede93bbf
1 changed files with 10 additions and 9 deletions
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19
src/SPU.cpp
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@ -799,9 +799,18 @@ void Mix(u32 dummy)
rightoutput = ((s64)rightoutput * MasterVolume) >> 7; rightoutput = ((s64)rightoutput * MasterVolume) >> 7;
leftoutput >>= 8; leftoutput >>= 8;
rightoutput >>= 8;
// Add SOUNDBIAS value
// The value used by all commercial games is 0x200, so we subtract that so it won't offset the final sound output.
if (ApplyBias == true)
{
leftoutput += (Bias << 6) - 0x8000;
rightoutput += (Bias << 6) - 0x8000;
}
if (leftoutput < -0x8000) leftoutput = -0x8000; if (leftoutput < -0x8000) leftoutput = -0x8000;
else if (leftoutput > 0x7FFF) leftoutput = 0x7FFF; else if (leftoutput > 0x7FFF) leftoutput = 0x7FFF;
rightoutput >>= 8;
if (rightoutput < -0x8000) rightoutput = -0x8000; if (rightoutput < -0x8000) rightoutput = -0x8000;
else if (rightoutput > 0x7FFF) rightoutput = 0x7FFF; else if (rightoutput > 0x7FFF) rightoutput = 0x7FFF;
@ -812,14 +821,6 @@ void Mix(u32 dummy)
rightoutput &= 0xFFFFFFC0; rightoutput &= 0xFFFFFFC0;
} }
// Add SOUNDBIAS value
// The value used by all commercial games is 0x200, so we subtract that so it won't offset the final sound output.
if (ApplyBias == true)
{
leftoutput += (Bias << 6) - 0x8000;
rightoutput += (Bias << 6) - 0x8000;
}
// OutputBufferFrame can never get full because it's // OutputBufferFrame can never get full because it's
// transfered to OutputBuffer at the end of the frame // transfered to OutputBuffer at the end of the frame
OutputBackbuffer[OutputBackbufferWritePosition ] = leftoutput >> 1; OutputBackbuffer[OutputBackbufferWritePosition ] = leftoutput >> 1;