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 "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_sustain,
            stage_release,
            stage_end
        };

        static const double Limit;

        EG_VCA();
        void ProcessFragment();
        void Trigger(uint PreAttack, double Attack, double Release);
        void Release();
        inline EG_VCA::stage_t GetStage() { return Stage; };
    protected:
        float   Level;
        bool    ReleaseSignalReceived;
        stage_t Stage;
        float   AttackCoeff;
        long    AttackStepsLeft;   ///< number of sample points til end of attack stage
        float   ReleaseCoeff;
        long    ReleaseStepsLeft;  ///< number of sample points til end of release stage

        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 "modulationsystem.h"
30
31	#define EG_ENVELOPE_LIMIT 0.001
32	#define EG_MIN_RELEASE_TIME 0.005
33
34	/**
35	* VCA Envelope Generator
36	*
37	* This EG controls volume attenuation.
38	*/
39	class EG_VCA {
40	public:
41	enum stage_t {
42	stage_attack,
43	stage_sustain,
44	stage_release,
45	stage_end
46	};
47
48	static const double Limit;
49
50	EG_VCA();
51	void ProcessFragment();
52	void Trigger(uint PreAttack, double Attack, double Release);
53	void Release();
54	inline EG_VCA::stage_t GetStage() { return Stage; };
55	protected:
56	float Level;
57	bool ReleaseSignalReceived;
58	stage_t Stage;
59	float AttackCoeff;
60	long AttackStepsLeft; ///< number of sample points til end of attack stage
61	float ReleaseCoeff;
62	long ReleaseStepsLeft; ///< number of sample points til end of release stage
63
64	inline long Min(long A, long B) {
65	return (A > B) ? B : A;
66	}
67	};
68
69	#endif // __EG_VCA_H__