engines/gig/EGDecay.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 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 __LS_GIG_EGDECAY_H__
#define __LS_GIG_EGDECAY_H__

#include "../../common/global.h"

#if DEBUG_HEADERS
# warning EGDecay.h included
#endif // DEBUG_HEADERS

#include "../../common/RTMath.h"
#include "../common/Event.h"
#include "Engine.h"

namespace LinuxSampler { namespace gig {

    /**
     * Decay Envelope Generator
     *
     * Simple Envelope Generator with only one stage: 'Decay'. We currently use
     * this specific EG only for pitch and thus it's not generalized yet, means
     * the initial envelope level (given by 'Depth') will raise / drop in
     * 'DecayTime' seconds to a level of exactly 1.0. If the initial level
     * ('Depth') is already 1.0, nothing happens. Beside that, the EG just
     * multiplies it's levels to the synthesis parameter sequence.
     */
    class EGDecay {
        public:
            EGDecay(gig::Engine* pEngine, Event::destination_t ModulationDestination);
            bool Process(uint Samples);
            void Trigger(float Depth, double DecayTime, uint Delay);
        protected:
            gig::Engine* pEngine;
            Event::destination_t ModulationDestination;
            uint  TriggerDelay;    ///< number of sample points triggering should be delayed
            float Level;
            float DecayCoeff;
            long  DecayStepsLeft;
    };

}} // namespace LinuxSampler::gig

#endif // __LS_GIG_EGDECAY_H__
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 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 __LS_GIG_EGDECAY_H__
24	#define __LS_GIG_EGDECAY_H__
25
26	#include "../../common/global.h"
27
28	#if DEBUG_HEADERS
29	# warning EGDecay.h included
30	#endif // DEBUG_HEADERS
31
32	#include "../../common/RTMath.h"
33	#include "../common/Event.h"
34	#include "Engine.h"
35
36	namespace LinuxSampler { namespace gig {
37
38	/**
39	* Decay Envelope Generator
40	*
41	* Simple Envelope Generator with only one stage: 'Decay'. We currently use
42	* this specific EG only for pitch and thus it's not generalized yet, means
43	* the initial envelope level (given by 'Depth') will raise / drop in
44	* 'DecayTime' seconds to a level of exactly 1.0. If the initial level
45	* ('Depth') is already 1.0, nothing happens. Beside that, the EG just
46	* multiplies it's levels to the synthesis parameter sequence.
47	*/
48	class EGDecay {
49	public:
50	EGDecay(gig::Engine* pEngine, Event::destination_t ModulationDestination);
51	bool Process(uint Samples);
52	void Trigger(float Depth, double DecayTime, uint Delay);
53	protected:
54	gig::Engine* pEngine;
55	Event::destination_t ModulationDestination;
56	uint TriggerDelay; ///< number of sample points triggering should be delayed
57	float Level;
58	float DecayCoeff;
59	long DecayStepsLeft;
60	};
61
62	}} // namespace LinuxSampler::gig
63
64	#endif // __LS_GIG_EGDECAY_H__