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2006-10-16
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106 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:FAST attack compressor with prog-dependent release
slider1:0<-60,0,0.1>Threshold (dB)
slider2:1<0,3,1{4,8,12,20,All}>Ratio
slider3:0<-20,20,0.1>Gain
slider4:20<20,2000,10>Attack time (usec.)
slider5:250<20,1000,1>Release time (msec.)
slider6:100<0,100,0.1>Mix%
@init
log2db = 8.6858896380650365530225783783321; // 20 / ln(10)
db2log = 0.11512925464970228420089957273422; // ln(10) / 20
dcoffset = 0.0000000000000000000000001;
attime=0.010;
reltime=0.100;
ratio=0;
cratio=0;
rundb=0;
overdb=0;
ratatcoef = exp(-1/(0.00001 * srate));
ratrelcoef = exp(-1/(0.5 * srate));
atcoef=exp(-1/(attime * srate));
relcoef=exp(-1/(reltime * srate));
mix=1;
@slider
thresh = slider1;
threshv = exp(thresh * db2log);
ratio = (slider2==0 ? 4 : (slider2==1 ? 8 : (slider2 == 2 ? 12 : (slider2 == 3 ? 20 : 20 ))));
slider2 == 4 ? (allin=1; cratio=20;) : (allin=0; cratio = ratio;);
cthresh = (softknee ? (thresh -3) : thresh);
cthreshv = exp(cthresh * db2log);
makeup = slider3;
makeupv = exp((makeup+autogain) * db2log);
attime = slider4 / 1000000;
reltime = slider5 / 1000;
atcoef=exp(-1/(attime * srate));
relcoef=exp(-1/(reltime * srate));
mix=slider6/100;
@sample
ospl0 = spl0;
ospl1 = spl1;
aspl0 = abs(spl0);
aspl1 = abs(spl1);
maxspl = max(aspl0, aspl1);
maxspl = maxspl * maxspl;
runave = maxspl + rmscoef * (runave - maxspl);
det = sqrt(max(0,runave));
overdb = 2.08136898 * log(det/cthreshv) * log2db;
overdb = max(0,overdb);
overdb - rundb > 5 ? (averatio = 4;);
overdb > rundb ? (
rundb = overdb + atcoef * (rundb - overdb);
runratio = averatio + ratatcoef * (runratio - averatio);
) : (
rundb = overdb + relcoef * (rundb - overdb);
runratio = averatio + ratrelcoef * (runratio - averatio);
);
overdb = rundb;
averatio = runratio;
allin ? (
cratio = 12 + averatio;
) : (
cratio = ratio;
);
gr = -overdb * (cratio-1)/cratio;
grv = exp(gr * db2log);
runmax = maxover + relcoef * (runmax - maxover); // highest peak for setting att/rel decays in reltime
maxover = runmax;
spl0 *= grv * makeupv * mix;
spl1 *= grv * makeupv * mix;
spl0 += ospl0 * (1-mix);
spl1 += ospl1 * (1-mix);