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PC World 2008 February
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reaper
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reaper2028-install.exe
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Effects
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Pitch
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superpitch
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Text File
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2007-12-03
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3KB
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129 lines
desc: super pitch shifter
slider1:0<-100,100,1>pitch adjust (cents)
slider2:0<-12,12,1>pitch adjust (semitones)
slider3:0<-12,12,1>pitch adjust (octaves)
slider4:50<0,200,1>window size (ms)
slider5:20<0.05,50,0.5>overlap size (ms)
slider6:0<-120,6,1>wet mix (dB)
slider7:-120<-120,6,1>dry mix (dB)
slider8:1<0,1,1{NO,YES}>filter
@init
bufsize = srate|0;
xfade=100;
bufloc0 = 10000;
bufloc1 = bufloc0+bufsize+1000;
buffer0 = bufloc0;
buffer1 = bufloc1;
bufdiff=bufloc1-bufloc0;
pitch=1.0;
denorm=10^-20;
@slider
filter=slider8>0.5;
bsnew=(min(slider4,1000)*0.001*srate)|0;
bsnew!=bufsize ?
(
bufsize = bsnew;
v0=buffer0+bufsize*0.5;
v0 > bufloc0 + bufsize? v0-=bufsize;
);
xfade=(slider5*0.001*srate)|0;
xfade>bsnew*0.5 ? xfade=bsnew*0.5;
npitch=2^((slider2+slider1*0.01)/12+slider3);
pitch!=npitch ? (
pitch=npitch;
lppos=pitch > 1.0 ? 1.0/pitch : pitch;
lppos< (.1/srate) ? lppos=.1/srate;
r=1.0;
c = 1.0 / tan($pi * lppos * 0.5);
a1 = 1.0 / ( 1.0 + r * c + c * c);
a2 = 2*a1;
a3 = a1;
b1 = 2.0 * ( 1.0 - c*c) * a1;
b2 = ( 1.0 - r * c + c * c) * a1;
h01=h02=h03=h04=0;
h11=h12=h13=h14=0;
);
drymix = 2 ^ (slider7/6);
wetmix = 2 ^ (slider6/6);
@sample
iv0=0|(v0); frac0=v0-iv0;
iv02 = iv0 >= (bufloc0+bufsize-1) ? iv0-bufsize+1 : iv0+1;
ren0=(iv0[0]*(1-frac0)+iv02[0]*frac0);
ren1=(iv0[bufdiff]*(1-frac0)+iv02[bufdiff]*frac0);
vr=pitch;
vr >= 1.0 ?
(
tv=v0;
tv>buffer0?tv-=bufsize;
(tv >= buffer0-xfade && tv < buffer0) ? (
// xfade
frac=(buffer0-tv)/xfade;
tmp=v0+xfade;
tmp>=bufloc0+bufsize?tmp-=bufsize;
tmp2=tmp>=bufloc0+bufsize-1?bufloc0:tmp+1;
ren0 = ren0*frac + (1-frac)*( tmp[0]*(1-frac0)+tmp2[0]*frac0 );
ren1 = ren1*frac + (1-frac)*( tmp[bufdiff]*(1-frac0)+tmp2[bufdiff]*frac0 );
tv+vr > buffer0+1 ? v0+=xfade;
);
) : ( // read pointer moving slower than write pointer
tv=v0;
tv<buffer0?tv+=bufsize;
(tv >= buffer0 && tv < buffer0+xfade) ? (
// xfade
frac=(tv-buffer0)/xfade;
tmp=v0+xfade;
tmp>=bufloc0+bufsize?tmp-=bufsize;
tmp2=tmp>=bufloc0+bufsize-1?bufloc0:tmp+1;
ren0 = ren0*frac + (1-frac)*( tmp[0]*(1-frac0)+tmp2[0]*frac0 );
ren1 = ren1*frac + (1-frac)*( tmp[bufdiff]*(1-frac0)+tmp2[bufdiff]*frac0 );
tv+vr < buffer0+1 ? v0+=xfade;
);
);
((v0+=vr) >= (bufloc0+bufsize)) ? v0 -= bufsize;
os0=spl0; os1=spl1;
filter && pitch>1.0?
(
t0=spl0; t1=spl1;
spl0=a1*spl0 + a2*h01 + a3*h02 - b1*h03 - b2*h04 + denorm;
spl1=a1*spl1 + a2*h11 + a3*h12 - b1*h13 - b2*h14 + denorm;
h02=h01; h01=t0;
h12=h11; h11=t1;
h04=h03; h03=spl0;
h14=h13; h13=spl1;
);
buffer0[0] = spl0; // write after reading it to avoid clicks
buffer0[bufdiff] = spl1;
spl0 = ren0 * wetmix;
spl1 = ren1 * wetmix;
filter && pitch<1.0?
(
t0=spl0; t1=spl1;
spl0=a1*spl0 + a2*h01 + a3*h02 - b1*h03 - b2*h04 + denorm;
spl1=a1*spl1 + a2*h11 + a3*h12 - b1*h13 - b2*h14 + denorm;
h02=h01; h01=t0;
h12=h11; h11=t1;
h04=h03; h03=spl0;
h14=h13; h13=spl1;
);
spl0+=os0*drymix;
spl1+=os1*drymix;
((buffer0+=1) >= (bufloc0 + bufsize)) ? buffer0 -= bufsize;