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	/***************************************************************************
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	#include "gig.h"
30	#include "rtelmemorypool.h"
31	#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	stage_attack_hold,
46	stage_decay1,
47	stage_decay2,
48	stage_sustain,
49	stage_release,
50	stage_end
51	};
52
53	EG_VCA();
54	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	protected:
58	uint TriggerDelay; ///< number of sample points triggering should be delayed
59	float Level;
60	stage_t Stage;
61	float AttackCoeff;
62	long AttackStepsLeft; ///< number of sample points til end of attack stage
63	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	float ReleaseCoeff;
71	long ReleaseStepsLeft; ///< number of sample points til end of release stage
72	bool ReleasePostponed; ///< If a "release" event occured in the previous audio fragment, but wasn't processed yet.
73
74	inline long Min(long A, long B) {
75	return (A > B) ? B : A;
76	}
77	};
78
79	#endif // __EG_VCA_H__