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/*
ZynAddSubFX - a software synthesizer
Distorsion.C - Distorsion effect
Copyright (C) 2002-2005 Nasca Octavian Paul
Author: Nasca Octavian Paul
This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License
as published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License (version 2) for more details.
You should have received a copy of the GNU General Public License (version 2)
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "Distorsion.h"
/*
* Waveshape (this is called by OscilGen::waveshape and Distorsion::process)
*/
void waveshapesmps(int n,REALTYPE *smps,unsigned char type,unsigned char drive){
int i;
REALTYPE ws=drive/127.0;
REALTYPE tmpv;
switch(type){
case 1: ws=pow(10,ws*ws*3.0)-1.0+0.001;//Arctangent
for (i=0;i<n;i++)
smps[i]=atan(smps[i]*ws)/atan(ws);
break;
case 2: ws=ws*ws*32.0+0.0001;//Asymmetric
if (ws<1.0) tmpv=sin(ws)+0.1;
else tmpv=1.1;
for (i=0;i<n;i++) {
smps[i]=sin(smps[i]*(0.1+ws-ws*smps[i]))/tmpv;
};
break;
case 3: ws=ws*ws*ws*20.0+0.0001;//Pow
for (i=0;i<n;i++) {
smps[i]*=ws;
if (fabs(smps[i])<1.0) {
smps[i]=(smps[i]-pow(smps[i],3.0))*3.0;
if (ws<1.0) smps[i]/=ws;
} else smps[i]=0.0;
};
break;
case 4: ws=ws*ws*ws*32.0+0.0001;//Sine
if (ws<1.57) tmpv=sin(ws);
else tmpv=1.0;
for (i=0;i<n;i++) smps[i]=sin(smps[i]*ws)/tmpv;
break;
case 5: ws=ws*ws+0.000001;//Quantisize
for (i=0;i<n;i++)
smps[i]=floor(smps[i]/ws+0.5)*ws;
break;
case 6: ws=ws*ws*ws*32+0.0001;//Zigzag
if (ws<1.0) tmpv=sin(ws);
else tmpv=1.0;
for (i=0;i<n;i++)
smps[i]=asin(sin(smps[i]*ws))/tmpv;
break;
case 7: ws=pow(2.0,-ws*ws*8.0); //Limiter
for (i=0;i<n;i++) {
REALTYPE tmp=smps[i];
if (fabs(tmp)>ws) {
if (tmp>=0.0) smps[i]=1.0;
else smps[i]=-1.0;
} else smps[i]/=ws;
};
break;
case 8: ws=pow(2.0,-ws*ws*8.0); //Upper Limiter
for (i=0;i<n;i++) {
REALTYPE tmp=smps[i];
if (tmp>ws) smps[i]=ws;
smps[i]*=2.0;
};
break;
case 9: ws=pow(2.0,-ws*ws*8.0); //Lower Limiter
for (i=0;i<n;i++) {
REALTYPE tmp=smps[i];
if (tmp<-ws) smps[i]=-ws;
smps[i]*=2.0;
};
break;
case 10:ws=(pow(2.0,ws*6.0)-1.0)/pow(2.0,6.0); //Inverse Limiter
for (i=0;i<n;i++) {
REALTYPE tmp=smps[i];
if (fabs(tmp)>ws) {
if (tmp>=0.0) smps[i]=tmp-ws;
else smps[i]=tmp+ws;
} else smps[i]=0;
};
break;
case 11:ws=pow(5,ws*ws*1.0)-1.0;//Clip
for (i=0;i<n;i++)
smps[i]=smps[i]*(ws+0.5)*0.9999-floor(0.5+smps[i]*(ws+0.5)*0.9999);
break;
case 12:ws=ws*ws*ws*30+0.001;//Asym2
if (ws<0.3) tmpv=ws;
else tmpv=1.0;
for (i=0;i<n;i++) {
REALTYPE tmp=smps[i]*ws;
if ((tmp>-2.0) && (tmp<1.0)) smps[i]=tmp*(1.0-tmp)*(tmp+2.0)/tmpv;
else smps[i]=0.0;
};
break;
case 13:ws=ws*ws*ws*32.0+0.0001;//Pow2
if (ws<1.0) tmpv=ws*(1+ws)/2.0;
else tmpv=1.0;
for (i=0;i<n;i++) {
REALTYPE tmp=smps[i]*ws;
if ((tmp>-1.0)&&(tmp<1.618034)) smps[i]=tmp*(1.0-tmp)/tmpv;
else if (tmp>0.0) smps[i]=-1.0;
else smps[i]=-2.0;
};
break;
case 14:ws=pow(ws,5.0)*80.0+0.0001;//sigmoid
if (ws>10.0) tmpv=0.5;
else tmpv=0.5-1.0/(exp(ws)+1.0);
for (i=0;i<n;i++) {
REALTYPE tmp=smps[i]*ws;
if (tmp<-10.0) tmp=-10.0;
else if (tmp>10.0) tmp=10.0;
tmp=0.5-1.0/(exp(tmp)+1.0);
smps[i]=tmp/tmpv;
};
break;
//update to Distorsion::changepar (Ptype max) if there is added more waveshapings functions
};
};
Distorsion::Distorsion(int insertion_,REALTYPE *efxoutl_,REALTYPE *efxoutr_){
efxoutl=efxoutl_;
efxoutr=efxoutr_;
lpfl=new AnalogFilter(2,22000,1,0);
lpfr=new AnalogFilter(2,22000,1,0);
hpfl=new AnalogFilter(3,20,1,0);
hpfr=new AnalogFilter(3,20,1,0);
filterpars=NULL;
insertion=insertion_;
//default values
Ppreset=0;
Pvolume=50;
Plrcross=40;
Pdrive=90;
Plevel=64;
Ptype=0;
Pnegate=0;
Plpf=127;
Phpf=0;
Pstereo=0;
Pprefiltering=0;
setpreset(Ppreset);
cleanup();
};
Distorsion::~Distorsion(){
delete (lpfl);
delete (lpfr);
delete (hpfl);
delete (hpfr);
};
/*
* Cleanup the effect
*/
void Distorsion::cleanup(){
lpfl->cleanup();
hpfl->cleanup();
lpfr->cleanup();
hpfr->cleanup();
};
/*
* Apply the filters
*/
void Distorsion::applyfilters(REALTYPE *efxoutl,REALTYPE *efxoutr){
lpfl->filterout(efxoutl);
hpfl->filterout(efxoutl);
if (Pstereo!=0){//stereo
lpfr->filterout(efxoutr);
hpfr->filterout(efxoutr);
};
};
/*
* Effect output
*/
void Distorsion::out(REALTYPE *smpsl,REALTYPE *smpsr){
int i;
REALTYPE l,r,lout,rout;
REALTYPE inputvol=pow(5.0,(Pdrive-32.0)/127.0);
if (Pnegate!=0) inputvol*=-1.0;
if (Pstereo!=0){//Stereo
for (i=0;i<SOUND_BUFFER_SIZE;i++){
efxoutl[i]=smpsl[i]*inputvol*panning;
efxoutr[i]=smpsr[i]*inputvol*(1.0-panning);
};
} else {
for (i=0;i<SOUND_BUFFER_SIZE;i++){
efxoutl[i]=( smpsl[i]*panning + smpsr[i]*(1.0-panning) ) * inputvol;
};
};
if (Pprefiltering!=0) applyfilters(efxoutl,efxoutr);
//no optimised, yet (no look table)
waveshapesmps(SOUND_BUFFER_SIZE,efxoutl,Ptype+1,Pdrive);
if (Pstereo!=0) waveshapesmps(SOUND_BUFFER_SIZE,efxoutr,Ptype+1,Pdrive);
if (Pprefiltering==0) applyfilters(efxoutl,efxoutr);
if (Pstereo==0) for (i=0;i<SOUND_BUFFER_SIZE;i++) efxoutr[i]=efxoutl[i];
REALTYPE level=dB2rap(60.0*Plevel/127.0-40.0);
for (i=0;i<SOUND_BUFFER_SIZE;i++){
lout=efxoutl[i];
rout=efxoutr[i];
l=lout*(1.0-lrcross)+rout*lrcross;
r=rout*(1.0-lrcross)+lout*lrcross;
lout=l;rout=r;
efxoutl[i]=lout*2.0*level;
efxoutr[i]=rout*2.0*level;
};
};
/*
* Parameter control
*/
void Distorsion::setvolume(unsigned char Pvolume){
this->Pvolume=Pvolume;
if (insertion==0) {
outvolume=pow(0.01,(1.0-Pvolume/127.0))*4.0;
volume=1.0;
} else {
volume=outvolume=Pvolume/127.0;
};
if (Pvolume==0) cleanup();
};
void Distorsion::setpanning(unsigned char Ppanning){
this->Ppanning=Ppanning;
panning=(Ppanning+0.5)/127.0;
};
void Distorsion::setlrcross(unsigned char Plrcross){
this->Plrcross=Plrcross;
lrcross=Plrcross/127.0*1.0;
};
void Distorsion::setlpf(unsigned char Plpf){
this->Plpf=Plpf;
REALTYPE fr=exp(pow(Plpf/127.0,0.5)*log(25000.0))+40;
lpfl->setfreq(fr);
lpfr->setfreq(fr);
};
void Distorsion::sethpf(unsigned char Phpf){
this->Phpf=Phpf;
REALTYPE fr=exp(pow(Phpf/127.0,0.5)*log(25000.0))+20.0;
hpfl->setfreq(fr);
hpfr->setfreq(fr);
};
void Distorsion::setpreset(unsigned char npreset){
const int PRESET_SIZE=11;
const int NUM_PRESETS=6;
unsigned char presets[NUM_PRESETS][PRESET_SIZE]={
//Overdrive 1
{127,64,35,56,70,0,0,96,0,0,0},
//Overdrive 2
{127,64,35,29,75,1,0,127,0,0,0},
//A. Exciter 1
{64,64,35,75,80,5,0,127,105,1,0},
//A. Exciter 2
{64,64,35,85,62,1,0,127,118,1,0},
//Guitar Amp
{127,64,35,63,75,2,0,55,0,0,0},
//Quantisize
{127,64,35,88,75,4,0,127,0,1,0}};
if (npreset>=NUM_PRESETS) npreset=NUM_PRESETS-1;
for (int n=0;n<PRESET_SIZE;n++) changepar(n,presets[npreset][n]);
if (insertion==0) changepar(0,(int) (presets[npreset][0]/1.5));//lower the volume if this is system effect
Ppreset=npreset;
cleanup();
};
void Distorsion::changepar(int npar,unsigned char value){
switch (npar){
case 0: setvolume(value);
break;
case 1: setpanning(value);
break;
case 2: setlrcross(value);
break;
case 3: Pdrive=value;
break;
case 4: Plevel=value;
break;
case 5: if (value>13) value=13;//this must be increased if more distorsion types are added
Ptype=value;
break;
case 6: if (value>1) value=1;
Pnegate=value;
break;
case 7: setlpf(value);
break;
case 8: sethpf(value);
break;
case 9: if (value>1) value=1;
Pstereo=value;
break;
case 10:Pprefiltering=value;
break;
};
};
unsigned char Distorsion::getpar(int npar){
switch (npar){
case 0: return(Pvolume);
break;
case 1: return(Ppanning);
break;
case 2: return(Plrcross);
break;
case 3: return(Pdrive);
break;
case 4: return(Plevel);
break;
case 5: return(Ptype);
break;
case 6: return(Pnegate);
break;
case 7: return(Plpf);
break;
case 8: return(Phpf);
break;
case 9: return(Pstereo);
break;
case 10:return(Pprefiltering);
break;
};
return(0);//in case of bogus parameter number
};
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