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/*
ZynAddSubFX - a software synthesizer
EQ.C - EQ 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 "EQ.h"
EQ::EQ(int insertion_,REALTYPE *efxoutl_,REALTYPE *efxoutr_){
efxoutl=efxoutl_;
efxoutr=efxoutr_;
insertion=insertion_;
filterpars=NULL;
for (int i=0;i<MAX_EQ_BANDS;i++){
filter[i].Ptype=0;
filter[i].Pfreq=64;
filter[i].Pgain=64;
filter[i].Pq=64;
filter[i].Pstages=0;
filter[i].l=new AnalogFilter(6,1000.0,1.0,0);
filter[i].r=new AnalogFilter(6,1000.0,1.0,0);
};
//default values
Ppreset=0;
Pvolume=50;
setpreset(Ppreset);
cleanup();
};
EQ::~EQ(){
};
/*
* Cleanup the effect
*/
void EQ::cleanup(){
for (int i=0;i<MAX_EQ_BANDS;i++){
filter[i].l->cleanup();
filter[i].r->cleanup();
};
};
/*
* Effect output
*/
void EQ::out(REALTYPE *smpsl,REALTYPE *smpsr){
int i;
for (i=0;i<SOUND_BUFFER_SIZE;i++){
efxoutl[i]=smpsl[i]*volume;
efxoutr[i]=smpsr[i]*volume;
};
for (i=0;i<MAX_EQ_BANDS;i++){
if (filter[i].Ptype==0) continue;
filter[i].l->filterout(efxoutl);
filter[i].r->filterout(efxoutr);
};
};
/*
* Parameter control
*/
void EQ::setvolume(unsigned char Pvolume){
this->Pvolume=Pvolume;
outvolume=pow(0.005,(1.0-Pvolume/127.0))*10.0;
if (insertion==0) {
volume=1.0;
} else {
volume=outvolume;
};
};
void EQ::setpreset(unsigned char npreset){
const int PRESET_SIZE=1;
const int NUM_PRESETS=2;
unsigned char presets[NUM_PRESETS][PRESET_SIZE]={
//EQ 1
{67},
//EQ 2
{67}};
if (npreset>=NUM_PRESETS) npreset=NUM_PRESETS-1;
for (int n=0;n<PRESET_SIZE;n++) changepar(n,presets[npreset][n]);
Ppreset=npreset;
};
void EQ::changepar(int npar,unsigned char value){
switch (npar){
case 0: setvolume(value);
break;
};
if (npar<10) return;
int nb=(npar-10)/5;//number of the band (filter)
if (nb>=MAX_EQ_BANDS) return;
int bp=npar%5;//band paramenter
REALTYPE tmp;
switch(bp){
case 0: if (value>9) value=0;//has to be changed if more filters will be added
filter[nb].Ptype=value;
if (value!=0){
filter[nb].l->settype(value-1);
filter[nb].r->settype(value-1);
};
break;
case 1: filter[nb].Pfreq=value;
tmp=600.0*pow(30.0,(value-64.0)/64.0);
filter[nb].l->setfreq(tmp);
filter[nb].r->setfreq(tmp);
break;
case 2: filter[nb].Pgain=value;
tmp=30.0*(value-64.0)/64.0;
filter[nb].l->setgain(tmp);
filter[nb].r->setgain(tmp);
break;
case 3: filter[nb].Pq=value;
tmp=pow(30.0,(value-64.0)/64.0);
filter[nb].l->setq(tmp);
filter[nb].r->setq(tmp);
break;
case 4: if (value>=MAX_FILTER_STAGES) value=MAX_FILTER_STAGES-1;
filter[nb].Pstages=value;
filter[nb].l->setstages(value);
filter[nb].r->setstages(value);
break;
};
};
unsigned char EQ::getpar(int npar){
switch (npar){
case 0: return(Pvolume);
break;
};
if (npar<10) return(0);
int nb=(npar-10)/5;//number of the band (filter)
if (nb>=MAX_EQ_BANDS) return(0);
int bp=npar%5;//band paramenter
switch(bp){
case 0: return(filter[nb].Ptype);
break;
case 1: return(filter[nb].Pfreq);
break;
case 2: return(filter[nb].Pgain);
break;
case 3: return(filter[nb].Pq);
break;
case 4: return(filter[nb].Pstages);
break;
};
return(0);//in case of bogus parameter number
};
REALTYPE EQ::getfreqresponse(REALTYPE freq){
REALTYPE resp=1.0;
for (int i=0;i<MAX_EQ_BANDS;i++){
if (filter[i].Ptype==0) continue;
resp*=filter[i].l->H(freq);
};
return(rap2dB(resp*outvolume));
};
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