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fix 4 bit pcm

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This commit is contained in:
Eknous-P 2025-06-04 14:37:01 +04:00
parent bcf4f5f508
commit 000c85b4cb
4 changed files with 38 additions and 11 deletions
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28
src/engine/sample.cpp
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@ -633,7 +633,7 @@ bool DivSample::initInternal(DivSampleDepth d, int count) {
break;
case DIV_SAMPLE_DEPTH_4BIT:
if (data4!=NULL) delete[] data4;
length4=count;
length4=(count+1)/2;
data4=new unsigned char[length4];
memset(data4,0,length4);
break;
@ -1334,11 +1334,18 @@ void DivSample::render(unsigned int formatMask) {
}
}
break;
case DIV_SAMPLE_DEPTH_4BIT:
case DIV_SAMPLE_DEPTH_4BIT: {
unsigned short nibble=0;
for (unsigned int i=0; i<samples; i++) {
data16[i]=data4[i]<<12;
if (i&1) {
nibble=data4[i/2]&0xf;
} else {
nibble=data4[i/2]>>4;
}
data16[i]=(nibble<<12)^0x8000;
}
break;
}
default:
return;
}
@ -1542,11 +1549,16 @@ void DivSample::render(unsigned int formatMask) {
}
if (NOT_IN_FORMAT(DIV_SAMPLE_DEPTH_4BIT)) {
if (!initInternal(DIV_SAMPLE_DEPTH_4BIT,samples)) return;
for (unsigned int i=0; i<samples; i++) {
data4[i]=(data16[i]>>12)&0xf;
// if (i+1<samples) {
// data4[i/2]|=(data16[i+1]>>12);
// }
unsigned char _sample=0, sample4=0;
unsigned short* samplePtr = (unsigned short*)data16;
for (unsigned int i=0; i<samples; i+=2) {
_sample=(*samplePtr++^0x8000)>>12;
sample4=_sample<<4;
if (i+1<samples) {
_sample=(*samplePtr++^0x8000)>>12;
sample4|=_sample;
}
data4[i/2]=sample4;
}
}
}