/[svn]/linuxsampler/trunk/src/eg_d.h
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Annotation of /linuxsampler/trunk/src/eg_d.h

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Revision 40 - (hide annotations) (download) (as text)
Tue Mar 30 13:14:58 2004 UTC (20 years ago) by schoenebeck
File MIME type: text/x-c++hdr
File size: 2736 byte(s)
* added Envelope Generator 2 and 3 (filter cutoff EG and pitch EG) for
  accurate .gig playback
* fixed accuracy of pitch calculation
* changed filter cutoff range to 100Hz..10kHz with exponential curve, this
  value range can also be adjusted on compile time by setting
  FILTER_CUTOFF_MIN and FILTER_CUTOFF_MAX in src/voice.h to desired
  frequencies
* src/lfo.h: lfo is now generalized to a C++ template, which will be useful
  especially when we implement further engines

1 schoenebeck 40 /***************************************************************************
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_D_H__
24     #define __EG_D_H__
25    
26     #include "global.h"
27     #include "modulationsystem.h"
28    
29     /**
30     * Decay Envelope Generator
31     *
32     * Simple Envelope Generator with only one stage: 'Decay'. We currently use
33     * this specific EG only for pitch and thus it's not generalized yet, means
34     * the initial envelope level (given by 'Depth') will raise / drop in
35     * 'DecayTime' seconds to a level of exactly 1.0. If the initial level
36     * ('Depth') is already 1.0, nothing happens. Beside that, the EG just
37     * multiplies it's levels to the synthesis parameter sequence.
38     */
39     class EG_D {
40     public:
41     EG_D(ModulationSystem::destination_t ModulationDestination);
42     void Process(uint Samples);
43     void Trigger(float Depth, double DecayTime, uint Delay);
44     protected:
45     ModulationSystem::destination_t ModulationDestination;
46     uint TriggerDelay; ///< number of sample points triggering should be delayed
47     float Level;
48     float DecayCoeff;
49     long DecayStepsLeft;
50    
51     inline long Min(long A, long B) {
52     return (A > B) ? B : A;
53     }
54     };
55    
56     #endif // __EG_D_H__

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