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/*
ZynAddSubFX - a software synthesizer
Resonance.C - Resonance
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 <stdlib.h>
#include "Resonance.h"
#include <stdio.h>
Resonance::Resonance():Presets(){
setpresettype("Presonance");
defaults();
};
Resonance::~Resonance(){
};
void Resonance::defaults(){
Penabled=0;
PmaxdB=20;
Pcenterfreq=64;//1 kHz
Poctavesfreq=64;
Pprotectthefundamental=0;
ctlcenter=1.0;
ctlbw=1.0;
for (int i=0;i<N_RES_POINTS;i++) Prespoints[i]=64;
};
/*
* Set a point of resonance function with a value
*/
void Resonance::setpoint(int n,unsigned char p){
if ((n<0)||(n>=N_RES_POINTS)) return;
Prespoints[n]=p;
};
/*
* Apply the resonance to FFT data
*/
void Resonance::applyres(int n,FFTFREQS fftdata,REALTYPE freq){
if (Penabled==0) return;//if the resonance is disabled
REALTYPE sum=0.0,
l1=log(getfreqx(0.0)*ctlcenter),
l2=log(2.0)*getoctavesfreq()*ctlbw;
for (int i=0;i<N_RES_POINTS;i++) if (sum<Prespoints[i]) sum=Prespoints[i];
if (sum<1.0) sum=1.0;
for (int i=1;i<n;i++){
REALTYPE x=(log(freq*i)-l1)/l2;//compute where the n-th hamonics fits to the graph
if (x<0.0) x=0.0;
x*=N_RES_POINTS;
REALTYPE dx=x-floor(x);x=floor(x);
int kx1=(int)x; if (kx1>=N_RES_POINTS) kx1=N_RES_POINTS-1;
int kx2=kx1+1;if (kx2>=N_RES_POINTS) kx2=N_RES_POINTS-1;
REALTYPE y=(Prespoints[kx1]*(1.0-dx)+Prespoints[kx2]*dx)/127.0-sum/127.0;
y=pow(10.0,y*PmaxdB/20.0);
if ((Pprotectthefundamental!=0)&&(i==1)) y=1.0;
fftdata.c[i]*=y;
fftdata.s[i]*=y;
};
};
/*
* Gets the response at the frequency "freq"
*/
REALTYPE Resonance::getfreqresponse(REALTYPE freq){
REALTYPE l1=log(getfreqx(0.0)*ctlcenter),
l2=log(2.0)*getoctavesfreq()*ctlbw,sum=0.0;
for (int i=0;i<N_RES_POINTS;i++) if (sum<Prespoints[i]) sum=Prespoints[i];
if (sum<1.0) sum=1.0;
REALTYPE x=(log(freq)-l1)/l2;//compute where the n-th hamonics fits to the graph
if (x<0.0) x=0.0;
x*=N_RES_POINTS;
REALTYPE dx=x-floor(x);x=floor(x);
int kx1=(int)x; if (kx1>=N_RES_POINTS) kx1=N_RES_POINTS-1;
int kx2=kx1+1;if (kx2>=N_RES_POINTS) kx2=N_RES_POINTS-1;
REALTYPE result=(Prespoints[kx1]*(1.0-dx)+Prespoints[kx2]*dx)/127.0-sum/127.0;
result=pow(10.0,result*PmaxdB/20.0);
return(result);
};
/*
* Smooth the resonance function
*/
void Resonance::smooth(){
REALTYPE old=Prespoints[0];
for (int i=0;i<N_RES_POINTS;i++){
old=old*0.4+Prespoints[i]*0.6;
Prespoints[i]=(int) old;
};
old=Prespoints[N_RES_POINTS-1];
for (int i=N_RES_POINTS-1;i>0;i--){
old=old*0.4+Prespoints[i]*0.6;
Prespoints[i]=(int) old+1;
if (Prespoints[i]>127) Prespoints[i]=127;
};
};
/*
* Randomize the resonance function
*/
void Resonance::randomize(int type){
int r=(int)(RND*127.0);
for (int i=0;i<N_RES_POINTS;i++){
Prespoints[i]=r;
if ((RND<0.1)&&(type==0)) r=(int)(RND*127.0);
if ((RND<0.3)&&(type==1)) r=(int)(RND*127.0);
if (type==2) r=(int)(RND*127.0);
};
smooth();
};
/*
* Interpolate the peaks
*/
void Resonance::interpolatepeaks(int type){
int x1=0,y1=Prespoints[0];
for (int i=1;i<N_RES_POINTS;i++){
if ((Prespoints[i]!=64)||(i+1==N_RES_POINTS)){
int y2=Prespoints[i];
for (int k=0;k<i-x1;k++){
float x=(float) k/(i-x1);
if (type==0) x=(1-cos(x*PI))*0.5;
Prespoints[x1+k]=(int)(y1*(1.0-x)+y2*x);
};
x1=i;
y1=y2;
};
};
};
/*
* Get the frequency from x, where x is [0..1]; x is the x coordinate
*/
REALTYPE Resonance::getfreqx(REALTYPE x){
if (x>1.0) x=1.0;
REALTYPE octf=pow(2.0,getoctavesfreq());
return(getcenterfreq()/sqrt(octf)*pow(octf,x));
};
/*
* Get the x coordinate from frequency (used by the UI)
*/
REALTYPE Resonance::getfreqpos(REALTYPE freq){
return((log(freq)-log(getfreqx(0.0)))/log(2.0)/getoctavesfreq());
};
/*
* Get the center frequency of the resonance graph
*/
REALTYPE Resonance::getcenterfreq(){
return(10000.0*pow(10,-(1.0-Pcenterfreq/127.0)*2.0));
};
/*
* Get the number of octave that the resonance functions applies to
*/
REALTYPE Resonance::getoctavesfreq(){
return(0.25+10.0*Poctavesfreq/127.0);
};
void Resonance::sendcontroller(MidiControllers ctl,REALTYPE par){
if (ctl==C_resonance_center) ctlcenter=par;
else ctlbw=par;
};
void Resonance::add2XML(XMLwrapper *xml){
xml->addparbool("enabled",Penabled);
if ((Penabled==0)&&(xml->minimal)) return;
xml->addpar("max_db",PmaxdB);
xml->addpar("center_freq",Pcenterfreq);
xml->addpar("octaves_freq",Poctavesfreq);
xml->addparbool("protect_fundamental_frequency",Pprotectthefundamental);
xml->addpar("resonance_points",N_RES_POINTS);
for (int i=0;i<N_RES_POINTS;i++){
xml->beginbranch("RESPOINT",i);
xml->addpar("val",Prespoints[i]);
xml->endbranch();
};
};
void Resonance::getfromXML(XMLwrapper *xml){
Penabled=xml->getparbool("enabled",Penabled);
PmaxdB=xml->getpar127("max_db",PmaxdB);
Pcenterfreq=xml->getpar127("center_freq",Pcenterfreq);
Poctavesfreq=xml->getpar127("octaves_freq",Poctavesfreq);
Pprotectthefundamental=xml->getparbool("protect_fundamental_frequency",Pprotectthefundamental);
for (int i=0;i<N_RES_POINTS;i++){
if (xml->enterbranch("RESPOINT",i)==0) continue;
Prespoints[i]=xml->getpar127("val",Prespoints[i]);
xml->exitbranch();
};
};
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