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

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Revision 40 - (show annotations) (download) (as text)
Tue Mar 30 13:14:58 2004 UTC (16 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 /***************************************************************************
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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