trunk/src/eg_vca.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003 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 __EG_VCA_H__
#define __EG_VCA_H__

#include <math.h>

#include "global.h"
#include "gig.h"
#include "rtelmemorypool.h"
#include "modulationsystem.h"

#define EG_ENVELOPE_LIMIT       0.001
#define EG_MIN_RELEASE_TIME     0.005

/**
 * VCA Envelope Generator
 *
 * This EG controls volume attenuation.
 */
class EG_VCA {
    public:
        enum stage_t {
            stage_attack,
            stage_attack_hold,
            stage_decay1,
            stage_decay2,
            stage_sustain,
            stage_release,
            stage_end
        };

        EG_VCA();
        void Process(uint Samples, RTEList<ModulationSystem::Event>* pEvents, ModulationSystem::Event* pTriggerEvent, double SamplePos, double CurrentPitch);
        void Trigger(uint PreAttack, double AttackTime, bool HoldAttack, long LoopStart, double Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, double ReleaseTime, uint Delay);
        inline EG_VCA::stage_t GetStage() { return Stage; }
    protected:
        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.

        inline long Min(long A, long B) {
            return (A > B) ? B : A;
        }
};

#endif // __EG_VCA_H__
1	schoenebeck	30	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5			* Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck *
6			* *
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 __EG_VCA_H__
24			#define __EG_VCA_H__
25
26			#include <math.h>
27
28			#include "global.h"
29	schoenebeck	33	#include "gig.h"
30			#include "rtelmemorypool.h"
31	schoenebeck	30	#include "modulationsystem.h"
32
33			#define EG_ENVELOPE_LIMIT 0.001
34			#define EG_MIN_RELEASE_TIME 0.005
35
36			/**
37			* VCA Envelope Generator
38			*
39			* This EG controls volume attenuation.
40			*/
41			class EG_VCA {
42			public:
43			enum stage_t {
44			stage_attack,
45	schoenebeck	33	stage_attack_hold,
46			stage_decay1,
47			stage_decay2,
48	schoenebeck	30	stage_sustain,
49			stage_release,
50			stage_end
51			};
52
53			EG_VCA();
54	schoenebeck	33	void Process(uint Samples, RTEList<ModulationSystem::Event>* pEvents, ModulationSystem::Event* pTriggerEvent, double SamplePos, double CurrentPitch);
55			void Trigger(uint PreAttack, double AttackTime, bool HoldAttack, long LoopStart, double Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, double ReleaseTime, uint Delay);
56			inline EG_VCA::stage_t GetStage() { return Stage; }
57	schoenebeck	30	protected:
58	schoenebeck	33	uint TriggerDelay; ///< number of sample points triggering should be delayed
59	schoenebeck	30	float Level;
60			stage_t Stage;
61			float AttackCoeff;
62			long AttackStepsLeft; ///< number of sample points til end of attack stage
63	schoenebeck	33	bool HoldAttack;
64			long LoopStart;
65			float Decay1Coeff;
66			long Decay1StepsLeft; ///< number of sample points in Decay1 stage
67			float Decay2Coeff;
68			bool InfiniteSustain;
69			float SustainLevel;
70	schoenebeck	30	float ReleaseCoeff;
71			long ReleaseStepsLeft; ///< number of sample points til end of release stage
72	schoenebeck	33	bool ReleasePostponed; ///< If a "release" event occured in the previous audio fragment, but wasn't processed yet.
73	schoenebeck	30
74			inline long Min(long A, long B) {
75			return (A > B) ? B : A;
76			}
77			};
78
79			#endif // __EG_VCA_H__