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Diffstat (limited to 'attic/muse_qt4_evolution/synti/zynaddsubfx/Synth/LFO.C')
| -rw-r--r-- | attic/muse_qt4_evolution/synti/zynaddsubfx/Synth/LFO.C | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/attic/muse_qt4_evolution/synti/zynaddsubfx/Synth/LFO.C b/attic/muse_qt4_evolution/synti/zynaddsubfx/Synth/LFO.C deleted file mode 100644 index 4ae548c1..00000000 --- a/attic/muse_qt4_evolution/synti/zynaddsubfx/Synth/LFO.C +++ /dev/null @@ -1,145 +0,0 @@ -/* - ZynAddSubFX - a software synthesizer - - LFO.C - LFO 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 <stdlib.h> -#include <stdio.h> -#include <math.h> - -#include "LFO.h" - - -LFO::LFO(LFOParams *lfopars,REALTYPE basefreq){ - if (lfopars->Pstretch==0) lfopars->Pstretch=1; - REALTYPE lfostretch=pow(basefreq/440.0,(lfopars->Pstretch-64.0)/63.0);//max 2x/octave - - REALTYPE lfofreq=(pow(2,lfopars->Pfreq*10.0)-1.0)/12.0*lfostretch; - incx=fabs(lfofreq)*(REALTYPE)SOUND_BUFFER_SIZE/(REALTYPE)SAMPLE_RATE; - - if (lfopars->Pcontinous==0){ - if (lfopars->Pstartphase==0) x=RND; - else x=fmod((lfopars->Pstartphase-64.0)/127.0+1.0,1.0); - } else { - REALTYPE tmp=fmod(lfopars->time*incx,1.0); - x=fmod((lfopars->Pstartphase-64.0)/127.0+1.0+tmp,1.0); - }; - - //Limit the Frequency(or else...) - if (incx>0.49999999) incx=0.499999999; - - - lfornd=lfopars->Prandomness/127.0; - if (lfornd<0.0) lfornd=0.0; else if (lfornd>1.0) lfornd=1.0; - -// lfofreqrnd=pow(lfopars->Pfreqrand/127.0,2.0)*2.0*4.0; - lfofreqrnd=pow(lfopars->Pfreqrand/127.0,2.0)*4.0; - - switch (lfopars->fel){ - case 1:lfointensity=lfopars->Pintensity/127.0;break; - case 2:lfointensity=lfopars->Pintensity/127.0*4.0;break;//in octave - default:lfointensity=pow(2,lfopars->Pintensity/127.0*11.0)-1.0;//in centi - x-=0.25;//chance the starting phase - break; - }; - - amp1=(1-lfornd)+lfornd*RND; - amp2=(1-lfornd)+lfornd*RND; - lfotype=lfopars->PLFOtype; - lfodelay=lfopars->Pdelay/127.0*4.0;//0..4 sec - incrnd=nextincrnd=1.0; - freqrndenabled=(lfopars->Pfreqrand!=0); - computenextincrnd(); - computenextincrnd();//twice because I want incrnd & nextincrnd to be random -}; - -LFO::~LFO(){ -}; - -/* - * LFO out - */ -REALTYPE LFO::lfoout(){ - REALTYPE out; - switch (lfotype){ - case 1: //LFO_TRIANGLE - if ((x>=0.0)&&(x<0.25)) out=4.0*x; - else if ((x>0.25)&&(x<0.75)) out=2-4*x; - else out=4.0*x-4.0; - break; - case 2: //LFO_SQUARE - if (x<0.5) out=-1; - else out=1; - break; - case 3: //LFO_RAMPUP - out=(x-0.5)*2.0; - break; - case 4: //LFO_RAMPDOWN - out=(0.5-x)*2.0; - break; - case 5: //LFO_EXP_DOWN 1 - out=pow(0.05,x)*2.0-1.0; - break; - case 6: //LFO_EXP_DOWN 2 - out=pow(0.001,x)*2.0-1.0; - break; - default:out=cos(x*2.0*PI);//LFO_SINE - }; - - - if ((lfotype==0)||(lfotype==1)) out*=lfointensity*(amp1+x*(amp2-amp1)); - else out*=lfointensity*amp2; - if (lfodelay<0.00001) { - if (freqrndenabled==0) x+=incx; - else { - float tmp=(incrnd*(1.0-x)+nextincrnd*x); - if (tmp>1.0) tmp=1.0; - else if (tmp<0.0) tmp=0.0; - x+=incx*tmp; - }; - if (x>=1) { - x=fmod(x,1.0); - amp1=amp2; - amp2=(1-lfornd)+lfornd*RND; - - computenextincrnd(); - }; - } else lfodelay-=(REALTYPE)SOUND_BUFFER_SIZE/(REALTYPE)SAMPLE_RATE; - return(out); -}; - -/* - * LFO out (for amplitude) - */ -REALTYPE LFO::amplfoout(){ - REALTYPE out; - out=1.0-lfointensity+lfoout(); - if (out<-1.0) out=-1.0; - else if (out>1.0) out=1.0; - return(out); -}; - - -void LFO::computenextincrnd(){ - if (freqrndenabled==0) return; - incrnd=nextincrnd; - nextincrnd=pow(0.5,lfofreqrnd)+RND*(pow(2.0,lfofreqrnd)-1.0); -}; - |