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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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SStillwell
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fairlychildish
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2007-12-03
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141 lines
// Copyright 2006, Thomas Scott Stillwell
// All rights reserved.
//
//Redistribution and use in source and binary forms, with or without modification, are permitted
//provided that the following conditions are met:
//
//Redistributions of source code must retain the above copyright notice, this list of conditions
//and the following disclaimer.
//
//Redistributions in binary form must reproduce the above copyright notice, this list of conditions
//and the following disclaimer in the documentation and/or other materials provided with the distribution.
//
//The name of Thomas Scott Stillwell may not be used to endorse or
//promote products derived from this software without specific prior written permission.
//
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
//IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
//FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
//BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
//(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
//PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
//STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
//THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
desc:compressor/limiter, similar to F670
slider1:0<-60,0,0.1>Threshold (dB)
slider2:70<0.1,100,0.1>Bias
slider3:0<-30,30,0.1>Makeup gain
slider4:0<0,1,1{Left/Right,Lat/Vert}>AGC
slider5:1<1,6,1>Time Constant
slider6:100<1,10000,1>Level detector RMS window
slider7:1<1,50,0.1>Current comp. ratio
slider8:0<-90,0,0.1>Gain reduction
@init
log2db = 8.6858896380650365530225783783321; // 20 / ln(10)
db2log = 0.11512925464970228420089957273422; // ln(10) / 20
i=0;
attime=0.0002; //200us
reltime=0.300; //300ms
rmstime=0.000050; //50us
maxover=0;
ratio=0;
cratio=0;
rundb=0;
overdb=0;
maxover=0;
atcoef=exp(-1/(attime * srate));
relcoef=exp(-1/(reltime * srate));
rmscoef=exp(-1/(rmstime * srate));
leftright = 0;
latvert = 1;
@slider
thresh = slider1;
threshv = exp(thresh * db2log);
ratio = 20;
bias = 80 * slider2 / 100;
cthresh = thresh - bias;
cthreshv = exp(cthresh * db2log);
makeup = slider3;
makeupv = exp(makeup * db2log);
agc = slider4;
timeconstant = slider5;
timeconstant == 1 ? (
attime = 0.0002;
reltime = 0.300;
);
timeconstant == 2 ? (
attime = 0.0002;
reltime = 0.800;
);
timeconstant == 3 ? (
attime = 0.0004;
reltime = 2.000;
);
timeconstant == 4 ? (
attime = 0.0008;
reltime = 5.000;
);
timeconstant == 5 ? (
attime = 0.0002;
reltime = 10.000;
);
timeconstant == 6 ? (
attime = 0.0004;
reltime = 25.000;
);
atcoef = exp(-1 / (attime * srate));
relcoef = exp(-1 / (reltime * srate));
rmstime = slider6 / 1000000;
rmscoef=exp(-1/(rmstime * srate));
@sample
agc == leftright ? (
aspl0 = abs(spl0);
aspl1 = abs(spl1);
) : (
aspl0 = abs(spl0+spl1)/2;
aspl1 = abs(spl0-spl1)/2;
);
maxspl = max(aspl0, aspl1);
maxspl = maxspl * maxspl;
runave = maxspl + rmscoef * (runave - maxspl);
det = sqrt(max(0,runave));
overdb = 2.08136898 * log(det/threshv) * log2db;
overdb = max(0,overdb);
overdb > rundb ? (
rundb = overdb + atcoef * (rundb - overdb);
) : (
rundb = overdb + relcoef * (rundb - overdb);
);
overdb = max(rundb,0);
bias == 0 ? (
cratio = ratio;
) : (
cratio = 1 + (ratio-1) * sqrt((overdb + dcoffset) / (bias + dcoffset));
);
slider7 = cratio;
gr = -overdb * (cratio-1)/cratio;
slider8 = -gr;
grv = exp(gr * db2log);
agc == leftright ? (
spl0 *= grv * makeupv;
spl1 *= grv * makeupv;
) : (
sav0 = (spl0 + spl1) * grv;
sav1 = (spl0 - spl1) * grv;
spl0 = makeupv * (sav0 + sav1) * 0.5;
spl1 = makeupv * (sav0 - sav1) * 0.5;
);