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/*
ZynAddSubFX - a software synthesizer
Phaser.C - Phaser 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 <math.h>
#include "Phaser.h"
#include <stdio.h>
#define PHASER_LFO_SHAPE 2
Phaser::Phaser(int insertion_,REALTYPE *efxoutl_,REALTYPE *efxoutr_){
efxoutl=efxoutl_;
efxoutr=efxoutr_;
filterpars=NULL;
oldl=NULL;
oldr=NULL;
insertion=insertion_;
Ppreset=0;
setpreset(Ppreset);
cleanup();
};
Phaser::~Phaser(){
if (oldl!=NULL) delete [] oldl;
if (oldr!=NULL) delete [] oldr;
};
/*
* Effect output
*/
void Phaser::out(REALTYPE *smpsl,REALTYPE *smpsr){
int i,j;
REALTYPE lfol,lfor,lgain,rgain,tmp;
lfo.effectlfoout(&lfol,&lfor);
lgain=lfol;
rgain=lfor;
lgain=(exp(lgain*PHASER_LFO_SHAPE)-1)/(exp(PHASER_LFO_SHAPE)-1.0);
rgain=(exp(rgain*PHASER_LFO_SHAPE)-1)/(exp(PHASER_LFO_SHAPE)-1.0);
lgain=1.0-phase*(1.0-depth)-(1.0-phase)*lgain*depth;
rgain=1.0-phase*(1.0-depth)-(1.0-phase)*rgain*depth;
if (lgain>1.0) lgain=1.0;else if (lgain<0.0) lgain=0.0;
if (rgain>1.0) rgain=1.0;else if (rgain<0.0) rgain=0.0;
for (i=0;i<SOUND_BUFFER_SIZE;i++){
REALTYPE x=(REALTYPE) i /SOUND_BUFFER_SIZE;
REALTYPE x1=1.0-x;
REALTYPE gl=lgain*x+oldlgain*x1;
REALTYPE gr=rgain*x+oldrgain*x1;
REALTYPE inl=smpsl[i]*panning+fbl;
REALTYPE inr=smpsr[i]*(1.0-panning)+fbr;
//Left channel
for (j=0;j<Pstages*2;j++){//Phasing routine
tmp=oldl[j];
oldl[j]=gl*tmp+inl;
inl=tmp-gl*oldl[j];
};
//Right channel
for (j=0;j<Pstages*2;j++){//Phasing routine
tmp=oldr[j];
oldr[j]=gr*tmp+inr;
inr=tmp-gr*oldr[j];
};
//Left/Right crossing
REALTYPE l=inl;
REALTYPE r=inr;
inl=l*(1.0-lrcross)+r*lrcross;
inr=r*(1.0-lrcross)+l*lrcross;
fbl=inl*fb;
fbr=inr*fb;
efxoutl[i]=inl;
efxoutr[i]=inr;
};
oldlgain=lgain; oldrgain=rgain;
if (Poutsub!=0)
for (i=0;i<SOUND_BUFFER_SIZE;i++){
efxoutl[i]*= -1.0;
efxoutr[i]*= -1.0;
};
};
/*
* Cleanup the effect
*/
void Phaser::cleanup(){
fbl=0.0;fbr=0.0;
oldlgain=0.0;
oldrgain=0.0;
for (int i=0;i<Pstages*2;i++) {
oldl[i]=0.0;
oldr[i]=0.0;
};
};
/*
* Parameter control
*/
void Phaser::setdepth(unsigned char Pdepth){
this->Pdepth=Pdepth;
depth=(Pdepth/127.0);
};
void Phaser::setfb(unsigned char Pfb){
this->Pfb=Pfb;
fb=(Pfb-64.0)/64.1;
};
void Phaser::setvolume(unsigned char Pvolume){
this->Pvolume=Pvolume;
outvolume=Pvolume/127.0;
if (insertion==0) volume=1.0;
else volume=outvolume;
};
void Phaser::setpanning(unsigned char Ppanning){
this->Ppanning=Ppanning;
panning=Ppanning/127.0;
};
void Phaser::setlrcross(unsigned char Plrcross){
this->Plrcross=Plrcross;
lrcross=Plrcross/127.0;
};
void Phaser::setstages(unsigned char Pstages){
if (oldl!=NULL) delete [] oldl;
if (oldr!=NULL) delete [] oldr;
if (Pstages>=MAX_PHASER_STAGES) Pstages=MAX_PHASER_STAGES-1;
this->Pstages=Pstages;
oldl=new REALTYPE[Pstages*2];
oldr=new REALTYPE[Pstages*2];
cleanup();
};
void Phaser::setphase(unsigned char Pphase){
this->Pphase=Pphase;
phase=(Pphase/127.0);
};
void Phaser::setpreset(unsigned char npreset){
const int PRESET_SIZE=12;
const int NUM_PRESETS=6;
unsigned char presets[NUM_PRESETS][PRESET_SIZE]={
//Phaser1
{64,64,36,0,0,64,110,64,1,0,0,20},
//Phaser2
{64,64,35,0,0,88,40,64,3,0,0,20},
//Phaser3
{64,64,31,0,0,66,68,107,2,0,0,20},
//Phaser4
{39,64,22,0,0,66,67,10,5,0,1,20},
//Phaser5
{64,64,20,0,1,110,67,78,10,0,0,20},
//Phaser6
{64,64,53,100,0,58,37,78,3,0,0,20}};
if (npreset>=NUM_PRESETS) npreset=NUM_PRESETS-1;
for (int n=0;n<PRESET_SIZE;n++) changepar(n,presets[npreset][n]);
Ppreset=npreset;
};
void Phaser::changepar(int npar,unsigned char value){
switch(npar){
case 0: setvolume(value);
break;
case 1: setpanning(value);
break;
case 2: lfo.Pfreq=value;
lfo.updateparams();
break;
case 3: lfo.Prandomness=value;
lfo.updateparams();
break;
case 4: lfo.PLFOtype=value;
lfo.updateparams();
break;
case 5: lfo.Pstereo=value;
lfo.updateparams();
break;
case 6: setdepth(value);
break;
case 7: setfb(value);
break;
case 8: setstages(value);
break;
case 9: setlrcross(value);
break;
case 10:if (value>1) value=1;
Poutsub=value;
break;
case 11:setphase(value);
break;
};
};
unsigned char Phaser::getpar(int npar){
switch (npar){
case 0: return(Pvolume);
break;
case 1: return(Ppanning);
break;
case 2: return(lfo.Pfreq);
break;
case 3: return(lfo.Prandomness);
break;
case 4: return(lfo.PLFOtype);
break;
case 5: return(lfo.Pstereo);
break;
case 6: return(Pdepth);
break;
case 7: return(Pfb);
break;
case 8: return(Pstages);
break;
case 9: return(Plrcross);
break;
case 10:return(Poutsub);
break;
case 11:return(Pphase);
break;
default:return (0);
};
};
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