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SoundUnit: change 1-bit PDM mode to 8-bit TDM

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tildearrow 2023-02-10 16:25:51 -05:00
parent 9ba9b7b4f5
commit 0165a19630
3 changed files with 15 additions and 38 deletions
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41
src/engine/platform/sound/su.cpp
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@ -258,11 +258,17 @@ void SoundUnit::NextSample(short* l, short* r) {
}
// mix
if (dsOut) {
tnsL=nsL[dsChannel]<<1;
tnsR=nsR[dsChannel]<<1;
dsChannel=(dsChannel+1)&7;
} else {
tnsL=(nsL[0]+nsL[1]+nsL[2]+nsL[3]+nsL[4]+nsL[5]+nsL[6]+nsL[7])>>2;
tnsR=(nsR[0]+nsR[1]+nsR[2]+nsR[3]+nsR[4]+nsR[5]+nsR[6]+nsR[7])>>2;
IL1=minval(32767,maxval(-32767,tnsL))>>8;
IL2=minval(32767,maxval(-32767,tnsR))>>8;
}
// write input lines to sample memory
if (ILSIZE&64) {
@ -324,36 +330,8 @@ void SoundUnit::NextSample(short* l, short* r) {
}
if (dsOut) {
tnsL=minval(32767,maxval(-32767,tnsL<<1));
tnsR=minval(32767,maxval(-32767,tnsR<<1));
short accumL=0;
short accumR=0;
for (int i=0; i<4; i++) {
if ((tnsL>>8)==0 && dsCounterL>0) dsCounterL=0;
dsCounterL+=tnsL>>8;
if (dsCounterL>=0) {
accumL+=4095;
dsCounterL-=127;
} else {
accumL+=-4095;
dsCounterL+=127;
}
if ((tnsR>>8)==0 && dsCounterR>0) dsCounterR=0;
dsCounterR+=tnsR>>8;
if (dsCounterR>=0) {
accumR+=4095;
dsCounterR-=127;
} else {
accumR+=-4095;
dsCounterR+=127;
}
}
*l=accumL;
*r=accumR;
*l=minval(32767,maxval(-32767,tnsL))&0xff00;
*r=minval(32767,maxval(-32767,tnsR))&0xff00;
} else {
*l=minval(32767,maxval(-32767,tnsL));
*r=minval(32767,maxval(-32767,tnsR));
@ -402,8 +380,7 @@ void SoundUnit::Reset() {
oldfreq[i]=0;
pcmdec[i]=0;
}
dsCounterL=0;
dsCounterR=0;
dsChannel=0;
tnsL=0;
tnsR=0;
ilBufPos=0;

2
src/engine/platform/sound/su.h
View file

@ -47,7 +47,7 @@ class SoundUnit {
unsigned short oldfreq[8];
unsigned int pcmSize;
bool dsOut;
short dsCounterL, dsCounterR;
unsigned char dsChannel;
public:
unsigned short resetfreq[8];
unsigned short voldcycles[8];

2
src/gui/sysConf.cpp
View file

@ -239,7 +239,7 @@ bool FurnaceGUI::drawSysConf(int chan, DivSystem type, DivConfig& flags, bool mo
pdm=false;
altered=true;
}
if (ImGui::RadioButton("1-bit PDM (rev C/E)",pdm==1)) {
if (ImGui::RadioButton("8-bit + TDM (rev C/E)",pdm==1)) {
pdm=true;
altered=true;
}