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prevent clipping in ADPCM samples

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tildearrow 2021-12-27 15:22:57 -05:00
parent f32c2fa06b
commit 11478fbdfe
2 changed files with 7 additions and 1 deletions
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6
src/engine/engine.cpp
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@ -1367,6 +1367,8 @@ void DivEngine::renderSamples() {
step=adSteps[index];
short sample=(j<s->rendLength)?((s->depth==16)?(s->rendData[j]>>4):(s->rendData[j]<<4)):0;
if (sample>0x7d0) sample=0x7d0;
if (sample<-0x7d0) sample=-0x7d0;
diff=sample-predsample;
if (diff>=0) {
encoded=0;
@ -1389,6 +1391,9 @@ void DivEngine::renderSamples() {
if (diff>=tempstep) encoded|=1;
acc+=jediTable[decstep+encoded];
if (acc>0x7ff || acc<-0x800) {
logW("clipping! %d\n",acc);
}
acc&=0xfff;
if (acc&0x800) acc|=~0xfff;
decstep+=adStepSeek[encoded&7]*16;
@ -1552,6 +1557,7 @@ void DivEngine::reset() {
extValuePresent=0;
speed1=song.speed1;
speed2=song.speed2;
globalPitch=0;
dispatch->reset();
}

2
src/engine/engine.h
View file

@ -80,7 +80,7 @@ class DivEngine {
bool extValuePresent;
bool repeatPattern;
int ticks, cycles, curRow, curOrder, remainingLoops, nextSpeed, clockDrift;
int changeOrd, changePos, totalTicks, totalCmds, lastCmds, cmdsPerSecond;
int changeOrd, changePos, totalTicks, totalCmds, lastCmds, cmdsPerSecond, globalPitch;
unsigned char extValue;
unsigned char speed1, speed2;
DivStatusView view;