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/*************************************************************************** |
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* * |
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* LinuxSampler - modular, streaming capable sampler * |
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* * |
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* Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the Free Software * |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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#ifndef __EG_VCA_H__ |
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#define __EG_VCA_H__ |
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#include <math.h> |
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#include "global.h" |
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#include "rtelmemorypool.h" |
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#include "modulationsystem.h" |
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#define EG_ENVELOPE_LIMIT 0.001 |
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#define EG_MIN_RELEASE_TIME 0.005 |
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//FIXME: class should be renamed to 'EG_ADSR' or something, as it's not only a VCA EG anymore; we do that when we restructure the source tree |
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/** |
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* ADSR Envelope Generator |
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* |
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* Envelope Generator with stage 'Attack', 'Attack_Hold', 'Decay_1', |
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* 'Decay_2', 'Sustain' and 'Release' for modulating arbitrary synthesis |
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* parameters. |
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*/ |
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class EG_VCA { |
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public: |
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enum stage_t { |
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stage_attack, |
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stage_attack_hold, |
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stage_decay1, |
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stage_decay2, |
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stage_sustain, |
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stage_release, |
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stage_end |
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}; |
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EG_VCA(ModulationSystem::destination_t ModulationDestination); |
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void Process(uint Samples, RTEList<ModulationSystem::Event>* pEvents, ModulationSystem::Event* pTriggerEvent, double SamplePos, double CurrentPitch); |
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void Trigger(uint PreAttack, double AttackTime, bool HoldAttack, long LoopStart, double Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, double ReleaseTime, uint Delay); |
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inline EG_VCA::stage_t GetStage() { return Stage; } |
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protected: |
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ModulationSystem::destination_t ModulationDestination; |
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uint TriggerDelay; ///< number of sample points triggering should be delayed |
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float Level; |
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stage_t Stage; |
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float AttackCoeff; |
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long AttackStepsLeft; ///< number of sample points til end of attack stage |
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bool HoldAttack; |
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long LoopStart; |
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float Decay1Coeff; |
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long Decay1StepsLeft; ///< number of sample points in Decay1 stage |
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float Decay2Coeff; |
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bool InfiniteSustain; |
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float SustainLevel; |
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float ReleaseCoeff; |
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long ReleaseStepsLeft; ///< number of sample points til end of release stage |
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bool ReleasePostponed; ///< If a "release" event occured in the previous audio fragment, but wasn't processed yet. |
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inline long Min(long A, long B) { |
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return (A > B) ? B : A; |
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} |
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}; |
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#endif // __EG_VCA_H__ |