engines/sfz/EGADSR.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2010 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., 51 Franklin St, Fifth Floor, Boston,                *
 *   MA  02110-1301  USA                                                   *
 ***************************************************************************/

#ifndef LS_SFZ_EGADSR_H
#define LS_SFZ_EGADSR_H

#include "../common/EG.h"

namespace LinuxSampler { namespace sfz {

/**
 * ADSR Envelope Generator
 *
 * SFZ v1 envelope generator with 'Attack', 'Hold', 'Decay', 'Sustain'
 * and 'Release' stages for modulating arbitrary synthesis parameters.
 */
class EGADSR : public ::LinuxSampler::EG {
    public:

        /**
         * Will be called by the voice when the key / voice was triggered.
         *
         * @param PreAttack       - Preattack value for the envelope
         *                          (0 - 1000 permille)
         * @param AttackTime      - Attack time for the envelope
         * @param HoldTime        - Hold time for the envelope
         * @param DecayTime       - Decay1 time of the sample amplitude EG
         * @param SustainLevel    - Sustain level of the sample amplitude EG
         *                          (0 - 1000 permille)
         * @param ReleaseTIme     - Release time for the envelope
         * @param SampleRate      - sample rate of used audio output driver
         */
        void trigger(uint PreAttack, float AttackTime, float HoldTime, float DecayTime, uint SustainLevel, float ReleaseTime, uint SampleRate); //FIXME: we should better use 'float' for SampleRate

        /**
         * Should be called to inform the EG about an external event and
         * also whenever an envelope stage is completed. This will handle
         * the envelope's transition to the respective next stage.
         *
         * @param Event        - what happened
         * @param SampleRate   - sample rate of used audio output driver
         */
        void update(event_t Event, uint SampleRate);

    private:

        enum stage_t {
            stage_attack,
            stage_attack_hold,
            stage_decay,
            stage_sustain,
            stage_release,
            stage_fadeout,
            stage_end
        };

        stage_t   Stage;
        int       HoldSteps;
        float     DecayTime;
        float     SustainLevel;
        float     ReleaseSlope;

        void enterAttackStage(const uint PreAttack, const float AttackTime, const uint SampleRate);
        void enterAttackHoldStage();
        void enterDecayStage(const uint SampleRate);
        void enterSustainStage();
        void enterReleaseStage();
};

}} // namespace LinuxSampler::sfz

#endif // LS_SFZ_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 - 2010 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., 51 Franklin St, Fifth Floor, Boston, *
21	* MA 02110-1301 USA *
22	***************************************************************************/
23
24	#ifndef LS_SFZ_EGADSR_H
25	#define LS_SFZ_EGADSR_H
26
27	#include "../common/EG.h"
28
29	namespace LinuxSampler { namespace sfz {
30
31	/**
32	* ADSR Envelope Generator
33	*
34	* SFZ v1 envelope generator with 'Attack', 'Hold', 'Decay', 'Sustain'
35	* and 'Release' stages for modulating arbitrary synthesis parameters.
36	*/
37	class EGADSR : public ::LinuxSampler::EG {
38	public:
39
40	/**
41	* Will be called by the voice when the key / voice was triggered.
42	*
43	* @param PreAttack - Preattack value for the envelope
44	* (0 - 1000 permille)
45	* @param AttackTime - Attack time for the envelope
46	* @param HoldTime - Hold time for the envelope
47	* @param DecayTime - Decay1 time of the sample amplitude EG
48	* @param SustainLevel - Sustain level of the sample amplitude EG
49	* (0 - 1000 permille)
50	* @param ReleaseTIme - Release time for the envelope
51	* @param SampleRate - sample rate of used audio output driver
52	*/
53	void trigger(uint PreAttack, float AttackTime, float HoldTime, float DecayTime, uint SustainLevel, float ReleaseTime, uint SampleRate); //FIXME: we should better use 'float' for SampleRate
54
55	/**
56	* Should be called to inform the EG about an external event and
57	* also whenever an envelope stage is completed. This will handle
58	* the envelope's transition to the respective next stage.
59	*
60	* @param Event - what happened
61	* @param SampleRate - sample rate of used audio output driver
62	*/
63	void update(event_t Event, uint SampleRate);
64
65	private:
66
67	enum stage_t {
68	stage_attack,
69	stage_attack_hold,
70	stage_decay,
71	stage_sustain,
72	stage_release,
73	stage_fadeout,
74	stage_end
75	};
76
77	stage_t Stage;
78	int HoldSteps;
79	float DecayTime;
80	float SustainLevel;
81	float ReleaseSlope;
82
83	void enterAttackStage(const uint PreAttack, const float AttackTime, const uint SampleRate);
84	void enterAttackHoldStage();
85	void enterDecayStage(const uint SampleRate);
86	void enterSustainStage();
87	void enterReleaseStage();
88	};
89
90	}} // namespace LinuxSampler::sfz
91
92	#endif // LS_SFZ_EGADSR_H