engines/gig/EGADSR.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 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/Pool.h"
#include "../common/Event.h"
#include "Manipulator.h"
#include "Engine.h"

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, RTList<Event>* pEvents, RTList<Event>::Iterator itTriggerEvent, double SamplePos, double CurrentPitch, RTList<Event>::Iterator itKillEvent = RTList<Event>::Iterator());
        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	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 Christian Schoenebeck *
7	* *
8	* This program is free software; you can redistribute it and/or modify *
9	* it under the terms of the GNU General Public License as published by *
10	* the Free Software Foundation; either version 2 of the License, or *
11	* (at your option) any later version. *
12	* *
13	* This program is distributed in the hope that it will be useful, *
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16	* GNU General Public License for more details. *
17	* *
18	* You should have received a copy of the GNU General Public License *
19	* along with this program; if not, write to the Free Software *
20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21	* MA 02111-1307 USA *
22	***************************************************************************/
23
24	#ifndef __LS_GIG_EGADSR_H__
25	#define __LS_GIG_EGADSR_H__
26
27	#include <math.h>
28
29	#include "../../common/global.h"
30	#include "../../common/RTMath.h"
31	#include "../../common/Pool.h"
32	#include "../common/Event.h"
33	#include "Manipulator.h"
34	#include "Engine.h"
35
36	namespace LinuxSampler { namespace gig {
37
38	/**
39	* ADSR Envelope Generator
40	*
41	* Envelope Generator with stage 'Attack', 'Attack_Hold', 'Decay_1',
42	* 'Decay_2', 'Sustain' and 'Release' for modulating arbitrary synthesis
43	* parameters.
44	*/
45	class EGADSR {
46	public:
47	enum stage_t {
48	stage_attack,
49	stage_attack_hold,
50	stage_decay1,
51	stage_decay2,
52	stage_sustain,
53	stage_release,
54	stage_fadeout,
55	stage_end
56	};
57
58	EGADSR(gig::Engine* pEngine, Event::destination_t ModulationDestination);
59	void Process(uint TotalSamples, RTList<Event>* pEvents, RTList<Event>::Iterator itTriggerEvent, double SamplePos, double CurrentPitch, RTList<Event>::Iterator itKillEvent = RTList<Event>::Iterator());
60	void Trigger(uint PreAttack, double AttackTime, bool HoldAttack, long LoopStart, double Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, double ReleaseTime, uint Delay);
61	inline EGADSR::stage_t GetStage() { return Stage; }
62	protected:
63	gig::Engine* pEngine;
64	Event::destination_t ModulationDestination;
65	uint TriggerDelay; ///< number of sample points triggering should be delayed
66	float Level;
67	stage_t Stage;
68	float AttackCoeff;
69	long AttackStepsLeft; ///< number of sample points til end of attack stage
70	bool HoldAttack;
71	long LoopStart;
72	float Decay1Coeff;
73	long Decay1StepsLeft; ///< number of sample points in Decay1 stage
74	float Decay2Coeff;
75	bool InfiniteSustain;
76	float SustainLevel;
77	float ReleaseCoeff;
78	long ReleaseStepsLeft; ///< number of sample points til end of release stage
79	bool ReleasePostponed; ///< If a "release" event occured in the previous audio fragment, but wasn't processed yet.
80	const static float FadeOutCoeff;
81	private:
82	static float CalculateFadeOutCoeff();
83	};
84
85	}} // namespace LinuxSampler::gig
86
87	#endif // __LS_GIG_EGADSR_H__