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C140: comment

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tildearrow 2023-08-12 04:12:22 -05:00
parent 6d1df99254
commit 1e580d6936
1 changed files with 7 additions and 1 deletions
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8
src/engine/platform/c140.cpp
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@ -441,9 +441,15 @@ void DivPlatformC140::renderSamples(int sysID) {
logW("out of C140 memory for sample %d!",i); logW("out of C140 memory for sample %d!",i);
break; break;
} }
// why is C140 not G.711-compliant? this weird bit mangling had me puzzled for 3 hours...
if (memPos+length>=(getSampleMemCapacity())) { if (memPos+length>=(getSampleMemCapacity())) {
if (s->depth==DIV_SAMPLE_DEPTH_MULAW) { if (s->depth==DIV_SAMPLE_DEPTH_MULAW) {
for (unsigned int i=0; i<(getSampleMemCapacity())-memPos; i++) {
unsigned char x=s->dataMuLaw[i]^0xff;
if (x&0x80) x^=15;
unsigned char c140Mu=(x&0x80)|((x&15)<<3)|((x&0x70)>>4);
sampleMem[i+(memPos/sizeof(short))]=((c140Mu)<<8);
}
} else { } else {
memcpy(sampleMem+(memPos/sizeof(short)),s->data16,(getSampleMemCapacity())-memPos); memcpy(sampleMem+(memPos/sizeof(short)),s->data16,(getSampleMemCapacity())-memPos);
} }