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2006-10-16
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73 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:peak-eating limiter
slider1:0.0<-30.0,0.0,0.1>Threshold
slider2:-0.1<-20.0,0.0,0.1>Ceiling
slider3:2.0<0,6.0,0.01>Soft clip (dB)
//slider4:10<3,20,0.1>Soft clip ratio
@init
pi = 3.1415926535;
log2db = 8.6858896380650365530225783783321; // 20 / ln(10)
db2log = 0.11512925464970228420089957273422; // ln(10) / 20
dcoffset = 0.0000000000000000000000001;
@slider
thresh=exp(slider1 * db2log);
threshdb=slider1;
ceiling=exp(slider2 * db2log);
ceildb=slider2;
makeup=exp((ceildb-threshdb) * db2log);
makeupdb=ceildb-threshdb;
sc = -slider3;
scv = exp(sc * db2log);
sccomp = exp(-sc * db2log);
peakdb = ceildb+25;
peaklvl = exp(peakdb * db2log);
scratio = slider4;
scmult = abs((ceildb - sc) / (peakdb - sc));
@sample
peak=max(abs(spl0),abs(spl1));
spl0=spl0*makeup;
spl1=spl1*makeup;
sign0 = sign(spl0);
sign1 = sign(spl1);
abs0=abs(spl0);
abs1=abs(spl1);
overdb0 = 2.08136898 * log(abs0) * log2db - ceildb;
overdb1 = 2.08136898 * log(abs1) * log2db - ceildb;
abs0 > scv ? (
// spl0=sign0*(scv + (abs0-scv)/scratio)*sccomp;
spl0=sign0*(scv + exp(overdb0*scmult)*db2log);
);
abs1 > scv ? (
// spl1=sign1*(scv + (abs1-scv)/scratio)*sccomp;
spl1=sign1*(scv + exp(overdb1*scmult)*db2log);
);
spl0=min(ceiling,abs(spl0))*sign(spl0);
spl1=min(ceiling,abs(spl1))*sign(spl1);