engines/gig/EGADSR.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   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 for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LS_GIG_EGADSR_H__
#define __LS_GIG_EGADSR_H__

#include <math.h>

#include "../../common/global.h"
#include "../../common/RTMath.h"
#include "../../common/RTELMemoryPool.h"
#include "../common/Event.h"
#include "Manipulator.h"
#include "Engine.h"

#define EG_ENVELOPE_LIMIT       0.001
#define EG_MIN_RELEASE_TIME     0.0001

namespace LinuxSampler { namespace gig {

/**
 * ADSR Envelope Generator
 *
 * Envelope Generator with stage 'Attack', 'Attack_Hold', 'Decay_1',
 * 'Decay_2', 'Sustain' and 'Release' for modulating arbitrary synthesis
 * parameters.
 */
class EGADSR {
    public:
        enum stage_t {
            stage_attack,
            stage_attack_hold,
            stage_decay1,
            stage_decay2,
            stage_sustain,
            stage_release,
            stage_fadeout,
            stage_end
        };

        EGADSR(gig::Engine* pEngine, Event::destination_t ModulationDestination);
        void Process(uint TotalSamples, RTEList<Event>* pEvents, Event* pTriggerEvent, double SamplePos, double CurrentPitch, Event* pKillEvent = NULL);
        void Trigger(uint PreAttack, double AttackTime, bool HoldAttack, long LoopStart, double Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, double ReleaseTime, uint Delay);
        inline EGADSR::stage_t GetStage() { return Stage; }
    protected:
        gig::Engine* pEngine;
        Event::destination_t ModulationDestination;
        uint    TriggerDelay;      ///< number of sample points triggering should be delayed
        float   Level;
        stage_t Stage;
        float   AttackCoeff;
        long    AttackStepsLeft;   ///< number of sample points til end of attack stage
        bool    HoldAttack;
        long    LoopStart;
        float   Decay1Coeff;
        long    Decay1StepsLeft;   ///< number of sample points in Decay1 stage
        float   Decay2Coeff;
        bool    InfiniteSustain;
        float   SustainLevel;
        float   ReleaseCoeff;
        long    ReleaseStepsLeft;  ///< number of sample points til end of release stage
        bool    ReleasePostponed;  ///< If a "release" event occured in the previous audio fragment, but wasn't processed yet.
        const static float FadeOutCoeff;
    private:
        static float CalculateFadeOutCoeff();
};

}} // namespace LinuxSampler::gig

#endif // __LS_GIG_EGADSR_H__
1	schoenebeck	53	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5	schoenebeck	56	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	schoenebeck	53	* *
7			* This program is free software; you can redistribute it and/or modify *
8			* it under the terms of the GNU General Public License as published by *
9			* the Free Software Foundation; either version 2 of the License, or *
10			* (at your option) any later version. *
11			* *
12			* This program is distributed in the hope that it will be useful, *
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15			* GNU General Public License for more details. *
16			* *
17			* You should have received a copy of the GNU General Public License *
18			* along with this program; if not, write to the Free Software *
19			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
20			* MA 02111-1307 USA *
21			***************************************************************************/
22
23			#ifndef __LS_GIG_EGADSR_H__
24			#define __LS_GIG_EGADSR_H__
25
26			#include <math.h>
27
28			#include "../../common/global.h"
29			#include "../../common/RTMath.h"
30			#include "../../common/RTELMemoryPool.h"
31			#include "../common/Event.h"
32			#include "Manipulator.h"
33			#include "Engine.h"
34
35			#define EG_ENVELOPE_LIMIT 0.001
36	schoenebeck	249	#define EG_MIN_RELEASE_TIME 0.0001
37	schoenebeck	53
38			namespace LinuxSampler { namespace gig {
39
40			/**
41			* ADSR Envelope Generator
42			*
43			* Envelope Generator with stage 'Attack', 'Attack_Hold', 'Decay_1',
44			* 'Decay_2', 'Sustain' and 'Release' for modulating arbitrary synthesis
45			* parameters.
46			*/
47			class EGADSR {
48			public:
49			enum stage_t {
50			stage_attack,
51			stage_attack_hold,
52			stage_decay1,
53			stage_decay2,
54			stage_sustain,
55			stage_release,
56	schoenebeck	252	stage_fadeout,
57	schoenebeck	53	stage_end
58			};
59
60			EGADSR(gig::Engine* pEngine, Event::destination_t ModulationDestination);
61	schoenebeck	239	void Process(uint TotalSamples, RTEList<Event>* pEvents, Event* pTriggerEvent, double SamplePos, double CurrentPitch, Event* pKillEvent = NULL);
62	schoenebeck	53	void Trigger(uint PreAttack, double AttackTime, bool HoldAttack, long LoopStart, double Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, double ReleaseTime, uint Delay);
63			inline EGADSR::stage_t GetStage() { return Stage; }
64			protected:
65			gig::Engine* pEngine;
66			Event::destination_t ModulationDestination;
67			uint TriggerDelay; ///< number of sample points triggering should be delayed
68			float Level;
69			stage_t Stage;
70			float AttackCoeff;
71			long AttackStepsLeft; ///< number of sample points til end of attack stage
72			bool HoldAttack;
73			long LoopStart;
74			float Decay1Coeff;
75			long Decay1StepsLeft; ///< number of sample points in Decay1 stage
76			float Decay2Coeff;
77			bool InfiniteSustain;
78			float SustainLevel;
79			float ReleaseCoeff;
80			long ReleaseStepsLeft; ///< number of sample points til end of release stage
81			bool ReleasePostponed; ///< If a "release" event occured in the previous audio fragment, but wasn't processed yet.
82	schoenebeck	252	const static float FadeOutCoeff;
83	schoenebeck	239	private:
84	schoenebeck	252	static float CalculateFadeOutCoeff();
85	schoenebeck	53	};
86
87			}} // namespace LinuxSampler::gig
88
89			#endif // __LS_GIG_EGADSR_H__