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