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sdsp: Check for invalid scale in defined way.

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This commit is contained in:
BearOso 2023-04-30 15:51:14 -05:00
parent bc98b1dee1
commit cbc14ee0df
1 changed files with 4 additions and 3 deletions
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7
apu/bapu/dsp/SPC_DSP.cpp
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@ -672,9 +672,10 @@ inline void SPC_DSP::decode_brr( voice_t* v )
// Shift sample based on header
int const shift = header >> 4;
s = (s << shift) >> 1;
if ( shift >= 0xD ) // handle invalid range
s = (s >> 25) << 11; // same as: s = (s < 0 ? -0x800 : 0)
if (shift <= 12)
s = (s << shift) >> 1;
else
s &= 0x7ff;
// Apply IIR filter (8 is the most commonly used)
int const filter = header & 0x0C;