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/*
ZynAddSubFX - a software synthesizer
Envelope.C - Envelope implementation
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 "Envelope.h"
Envelope::Envelope(EnvelopeParams *envpars,REALTYPE basefreq){
int i;
envpoints=envpars->Penvpoints;
if (envpoints>MAX_ENVELOPE_POINTS) envpoints=MAX_ENVELOPE_POINTS;
envsustain=(envpars->Penvsustain==0)?-1:envpars->Penvsustain;
forcedrelase=envpars->Pforcedrelease;
envstretch=pow(440.0/basefreq,envpars->Penvstretch/64.0);
linearenvelope=envpars->Plinearenvelope;
if (envpars->Pfreemode==0) envpars->converttofree();
REALTYPE bufferdt=SOUND_BUFFER_SIZE/(REALTYPE)SAMPLE_RATE;
int mode=envpars->Envmode;
//for amplitude envelopes
if ((mode==1)&&(linearenvelope==0)) mode=2;//change to log envelope
if ((mode==2)&&(linearenvelope!=0)) mode=1;//change to linear
for (i=0;i<MAX_ENVELOPE_POINTS;i++) {
REALTYPE tmp=envpars->getdt(i)/1000.0*envstretch;
if (tmp>bufferdt) envdt[i]=bufferdt/tmp;
else envdt[i]=2.0;//any value larger than 1
switch (mode){
case 2:envval[i]=(1.0-envpars->Penvval[i]/127.0)*MIN_ENVELOPE_DB;
break;
case 3:envval[i]=(pow(2,6.0*fabs(envpars->Penvval[i]-64.0)/64.0)-1.0)*100.0;
if (envpars->Penvval[i]<64) envval[i]=-envval[i];
break;
case 4:envval[i]=(envpars->Penvval[i]-64.0)/64.0*6.0;//6 octaves (filtru)
break;
case 5:envval[i]=(envpars->Penvval[i]-64.0)/64.0*10;
break;
default:envval[i]=envpars->Penvval[i]/127.0;
};
};
envdt[0]=1.0;
currentpoint=1;//the envelope starts from 1
keyreleased=0;
t=0.0;
envfinish=0;
inct=envdt[1];
envoutval=0.0;
};
Envelope::~Envelope(){
};
/*
* Relase the key (note envelope)
*/
void Envelope::relasekey(){
if (keyreleased==1) return;
keyreleased=1;
if (forcedrelase!=0) t=0.0;
};
/*
* Envelope Output
*/
REALTYPE Envelope::envout(){
REALTYPE out;
if (envfinish!=0) {//if the envelope is finished
envoutval=envval[envpoints-1];
return(envoutval);
};
if ((currentpoint==envsustain+1)&&(keyreleased==0)) {//if it is sustaining now
envoutval=envval[envsustain];
return(envoutval);
};
if ((keyreleased!=0) && (forcedrelase!=0)){//do the forced release
int tmp=(envsustain<0) ? (envpoints-1):(envsustain+1);//if there is no sustain point, use the last point for release
if (envdt[tmp]<0.00000001) out=envval[tmp];
else out=envoutval+(envval[tmp]-envoutval)*t;
t+=envdt[tmp]*envstretch;
if (t>=1.0) {
currentpoint=envsustain+2;
forcedrelase=0;
t=0.0;
inct=envdt[currentpoint];
if ((currentpoint>=envpoints)||(envsustain<0)) envfinish=1;
};
return(out);
};
if (inct>=1.0) out=envval[currentpoint];
else out=envval[currentpoint-1]+(envval[currentpoint]-envval[currentpoint-1])*t;
t+=inct;
if (t>=1.0){
if (currentpoint>=envpoints-1) envfinish=1;
else currentpoint++;
t=0.0;
inct=envdt[currentpoint];
};
envoutval=out;
return (out);
};
/*
* Envelope Output (dB)
*/
REALTYPE Envelope::envout_dB(){
REALTYPE out;
if (linearenvelope!=0) return (envout());
if ((currentpoint==1)&&((keyreleased==0)||(forcedrelase==0))) {//first point is always lineary interpolated
REALTYPE v1=dB2rap(envval[0]);
REALTYPE v2=dB2rap(envval[1]);
out=v1+(v2-v1)*t;
t+=inct;
if (t>=1.0) {
t=0.0;
inct=envdt[2];
currentpoint++;
out=v2;
};
if (out>0.001) envoutval=rap2dB(out);
else envoutval=-40.0;
} else out=dB2rap(envout());
return(out);
};
int Envelope::finished(){
return(envfinish);
};
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