151 lines
3.7 KiB
C++
Executable File
151 lines
3.7 KiB
C++
Executable File
/*
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==============================================================================
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This file is part of Obxd synthesizer.
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Copyright © 2013-2014 Filatov Vadim
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Contact author via email :
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justdat_@_e1.ru
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This file may be licensed under the terms of of the
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GNU General Public License Version 2 (the ``GPL'').
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Software distributed under the License is distributed
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on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
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express or implied. See the GPL for the specific language
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governing rights and limitations.
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You should have received a copy of the GPL along with this
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program. If not, go to http://www.gnu.org/licenses/gpl.html
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or write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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==============================================================================
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*/
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#pragma once
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#include "ObxdVoice.h"
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class AdsrEnvelope
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{
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private:
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float Value;
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float attack, decay, sustain, release;
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float ua,ud,us,ur;
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float coef;
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int state;//1 - attack 2- decay 3 - sustain 4 - release 5-silence
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float SampleRate;
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float uf;
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public:
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AdsrEnvelope()
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{
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uf = 1;
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Value = 0.0;
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attack=decay=sustain=release=0.0001;
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ua=ud=us=ur=0.0001;
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coef = 0;
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state = 5;
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SampleRate = 44000;
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}
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void ResetEnvelopeState()
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{
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Value = 0.0;
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state = 5;
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}
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void setSampleRate(float sr)
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{
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SampleRate = sr;
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}
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void setUniqueDeriviance(float der)
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{
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uf = der;
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setAttack(ua);
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setDecay(ud);
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setSustain(us);
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setRelease(ur);
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}
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void setAttack(float atk)
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{
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ua = atk;
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attack = atk*uf;
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if(state == 1)
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coef = (float)((log(0.001) - log(1.3)) / (SampleRate * (atk) / 1000));
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}
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void setDecay(float dec)
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{
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ud = dec;
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decay = dec*uf;
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if(state == 2)
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coef = (float)((log(jmin(sustain + 0.0001,0.99)) - log(1.0)) / (SampleRate * (dec) / 1000));
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}
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void setSustain(float sust)
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{
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us = sust;
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sustain = sust;
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if(state == 2)
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coef = (float)((log(jmin(sustain + 0.0001,0.99)) - log(1.0)) / (SampleRate * (decay) / 1000));
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}
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void setRelease(float rel)
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{
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ur = rel;
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release = rel*uf;
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if(state == 4)
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coef = (float)((log(0.00001) - log(Value + 0.0001)) / (SampleRate * (rel) / 1000));
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}
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void triggerAttack()
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{
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state = 1;
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//Value = Value +0.00001f;
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coef = (float)((log(0.001) - log(1.3)) / (SampleRate * (attack)/1000 ));
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}
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void triggerRelease()
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{
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if(state!=4)
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coef = (float)((log(0.00001) - log(Value+0.0001)) / (SampleRate * (release) / 1000));
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state = 4;
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}
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inline bool isActive()
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{
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return state!=5;
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}
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inline float processSample()
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{
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switch (state)
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{
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case 1:
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if (Value - 1 > -0.1)
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{
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Value = jmin(Value, 0.99f);
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state = 2;
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coef = (float)((log(jmin(sustain + 0.0001, 0.99)) - log(1.0)) / (SampleRate * (decay) / 1000));
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goto dec;
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}
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else
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{
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Value = Value - (1-Value)*(coef);
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}
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break;
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case 2:
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dec:
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if (Value - sustain < 10e-6)
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{
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state = 3;
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}
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else
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{
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Value =Value + Value * coef;
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}
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break;
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case 3: Value = jmin(sustain, 0.9f);
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break;
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case 4:
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if (Value > 20e-6)
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Value = Value + Value * coef + dc;
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else state = 5;
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break;
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case 5:
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Value = 0.0f;
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break;
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}
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return Value;
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}
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};
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