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GUI: optimize chan osc 

don't process FFT if not loud enough
don't process DFT if we couldn't determine wave length
This commit is contained in:
tildearrow 2023-09-03 20:09:03 -05:00
parent 90980a3062
commit 7a78ec1b60
1 changed files with 65 additions and 76 deletions
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141
src/gui/chanOsc.cpp
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@ -469,81 +469,86 @@ void FurnaceGUI::drawChanOsc() {
// if you know how, please tell me
// initialization
double phase=0.0;
float minLevel=1.0f;
float maxLevel=-1.0f;
float dcOff=0.0f;
unsigned short needlePos=buf->needle;
bool loudEnough=false;
// first FFT
for (int j=0; j<FURNACE_FFT_SIZE; j++) {
fft->inBuf[j]=(double)buf->data[(unsigned short)(needlePos-displaySize*2+((j*displaySize*2)/(FURNACE_FFT_SIZE)))]/32768.0;
if (fft->inBuf[j]>0.001 || fft->inBuf[j]<-0.001) loudEnough=true;
fft->inBuf[j]*=0.55-0.45*cos(M_PI*(double)j/(double)(FURNACE_FFT_SIZE>>1));
}
fftw_execute(fft->plan);
// auto-correlation and second FFT
for (int j=0; j<FURNACE_FFT_SIZE; j++) {
fft->outBuf[j][0]/=FURNACE_FFT_SIZE;
fft->outBuf[j][1]/=FURNACE_FFT_SIZE;
fft->outBuf[j][0]=fft->outBuf[j][0]*fft->outBuf[j][0]+fft->outBuf[j][1]*fft->outBuf[j][1];
fft->outBuf[j][1]=0;
}
fft->outBuf[0][0]=0;
fft->outBuf[0][1]=0;
fft->outBuf[1][0]=0;
fft->outBuf[1][1]=0;
fftw_execute(fft->planI);
// only proceed if not quiet
if (loudEnough) {
fftw_execute(fft->plan);
// find size of period
double waveLen=FURNACE_FFT_SIZE-1;
double waveLenCandL=DBL_MAX;
double waveLenCandH=DBL_MIN;
int waveLenBottom=0;
// auto-correlation and second FFT
for (int j=0; j<FURNACE_FFT_SIZE; j++) {
fft->outBuf[j][0]/=FURNACE_FFT_SIZE;
fft->outBuf[j][1]/=FURNACE_FFT_SIZE;
fft->outBuf[j][0]=fft->outBuf[j][0]*fft->outBuf[j][0]+fft->outBuf[j][1]*fft->outBuf[j][1];
fft->outBuf[j][1]=0;
}
fft->outBuf[0][0]=0;
fft->outBuf[0][1]=0;
fft->outBuf[1][0]=0;
fft->outBuf[1][1]=0;
fftw_execute(fft->planI);
// find lowest point
for (int j=(FURNACE_FFT_SIZE>>1); j>2; j--) {
if (fft->corrBuf[j]<waveLenCandL) {
waveLenCandL=fft->corrBuf[j];
waveLenBottom=j;
// find size of period
double waveLen=FURNACE_FFT_SIZE-1;
double waveLenCandL=DBL_MAX;
double waveLenCandH=DBL_MIN;
int waveLenBottom=0;
// find lowest point
for (int j=(FURNACE_FFT_SIZE>>1); j>2; j--) {
if (fft->corrBuf[j]<waveLenCandL) {
waveLenCandL=fft->corrBuf[j];
waveLenBottom=j;
}
}
// find highest point
for (int j=(FURNACE_FFT_SIZE>>1); j>waveLenBottom; j--) {
if (fft->corrBuf[j]>waveLenCandH) {
waveLenCandH=fft->corrBuf[j];
waveLen=j;
}
}
// did we find the period size?
if (waveLen<(FURNACE_FFT_SIZE-32)) {
waveLen*=(double)displaySize*2.0/(double)FURNACE_FFT_SIZE;
// we got pitch
chanOscPitch[ch]=1.0-pow(waveLen/(double)(FURNACE_FFT_SIZE>>1),2.0);
// DFT of one period (x_1)
double dft[2];
dft[0]=0.0;
dft[1]=0.0;
for (int j=0; j<waveLen; j++) {
double one=((double)buf->data[(unsigned short)(needlePos-((int)waveLen)+j)&0xffff]/32768.0);
double two=(double)j*(-2.0*M_PI)/waveLen;
dft[0]+=one*cos(two);
dft[1]+=one*sin(two);
}
// calculate and lock into phase
phase=(0.5+(atan2(dft[1],dft[0])/(2.0*M_PI)));
if (chanOscWaveCorr) {
needlePos-=phase*waveLen;
needlePos-=(2*waveLen-fmod(displaySize,waveLen*2))*0.5;
}
}
}
// find highest point
for (int j=(FURNACE_FFT_SIZE>>1); j>waveLenBottom; j--) {
if (fft->corrBuf[j]>waveLenCandH) {
waveLenCandH=fft->corrBuf[j];
waveLen=j;
}
}
waveLen*=(double)displaySize*2.0/(double)FURNACE_FFT_SIZE;
// DFT of one period (x_1)
double dft[2];
dft[0]=0.0;
dft[1]=0.0;
for (int j=0; j<waveLen; j++) {
double one=((double)buf->data[(unsigned short)(needlePos-((int)waveLen)+j)&0xffff]/32768.0);
double two=(double)j*(-2.0*M_PI)/waveLen;
dft[0]+=one*cos(two);
dft[1]+=one*sin(two);
}
// calculate and lock into phase
double phase=(0.5+(atan2(dft[1],dft[0])/(2.0*M_PI)));
double maxavg=0.0;
for (unsigned short j=0; j<(FURNACE_FFT_SIZE>>1); j++) {
if (fabs(fft->corrBuf[j]>maxavg)) {
maxavg=fabs(fft->corrBuf[j]);
}
}
if (maxavg>0.0000001) maxavg=0.5/maxavg;
if (chanOscWaveCorr) {
needlePos-=phase*waveLen;
needlePos-=(2*waveLen-fmod(displaySize,waveLen*2))*0.5;
}
//chanOscPitch[ch]=(float)point/32.0f;
needlePos-=displaySize;
for (unsigned short j=0; j<precision; j++) {
@ -561,22 +566,6 @@ void FurnaceGUI::drawChanOsc() {
y*=chanOscAmplify;
waveform[j]=ImLerp(inRect.Min,inRect.Max,ImVec2(x,0.5f-y));
}
// FFT debug code!
/*if (debugFFT) {
for (unsigned short j=0; j<precision; j++) {
float x=(float)j/(float)precision;
float y=fft->corrBuf[(j*FURNACE_FFT_SIZE)/precision]*maxavg;
if (j>=precision/2) {
y=fft->inBuf[((j-(precision/2))*FURNACE_FFT_SIZE*2)/(precision)];
}
waveform[j]=ImLerp(inRect.Min,inRect.Max,ImVec2(x,0.5f-y));
}
}*/
/*String cPhase=fmt::sprintf("\n%.1f - %.2f (%.2f %.2f)",waveLen,phase,dft.imag(),dft.real());
dl->AddText(inRect.Min,0xffffffff,cPhase.c_str());*/
}
ImU32 color=ImGui::GetColorU32(chanOscColor);
if (chanOscUseGrad) {