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Diffstat (limited to 'attic/muse_qt4_evolution/synti/zynaddsubfx/Synth/Envelope.C')
| -rw-r--r-- | attic/muse_qt4_evolution/synti/zynaddsubfx/Synth/Envelope.C | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/attic/muse_qt4_evolution/synti/zynaddsubfx/Synth/Envelope.C b/attic/muse_qt4_evolution/synti/zynaddsubfx/Synth/Envelope.C new file mode 100644 index 00000000..a0194022 --- /dev/null +++ b/attic/muse_qt4_evolution/synti/zynaddsubfx/Synth/Envelope.C @@ -0,0 +1,165 @@ +/* + 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); +}; + |