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 "rtelmemorypool.h" |
30 |
#include "modulationsystem.h" |
31 |
|
32 |
#define EG_ENVELOPE_LIMIT 0.001 |
33 |
#define EG_MIN_RELEASE_TIME 0.005 |
34 |
|
35 |
//FIXME: class should be renamed to 'EG_ADSR' or something, as it's not only a VCA EG anymore; we do that when we restructure the source tree |
36 |
|
37 |
/** |
38 |
* ADSR Envelope Generator |
39 |
* |
40 |
* Envelope Generator with stage 'Attack', 'Attack_Hold', 'Decay_1', |
41 |
* 'Decay_2', 'Sustain' and 'Release' for modulating arbitrary synthesis |
42 |
* parameters. |
43 |
*/ |
44 |
class EG_VCA { |
45 |
public: |
46 |
enum stage_t { |
47 |
stage_attack, |
48 |
stage_attack_hold, |
49 |
stage_decay1, |
50 |
stage_decay2, |
51 |
stage_sustain, |
52 |
stage_release, |
53 |
stage_end |
54 |
}; |
55 |
|
56 |
EG_VCA(ModulationSystem::destination_t ModulationDestination); |
57 |
void Process(uint Samples, RTEList<ModulationSystem::Event>* pEvents, ModulationSystem::Event* pTriggerEvent, double SamplePos, double CurrentPitch); |
58 |
void Trigger(uint PreAttack, double AttackTime, bool HoldAttack, long LoopStart, double Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, double ReleaseTime, uint Delay); |
59 |
inline EG_VCA::stage_t GetStage() { return Stage; } |
60 |
protected: |
61 |
ModulationSystem::destination_t ModulationDestination; |
62 |
uint TriggerDelay; ///< number of sample points triggering should be delayed |
63 |
float Level; |
64 |
stage_t Stage; |
65 |
float AttackCoeff; |
66 |
long AttackStepsLeft; ///< number of sample points til end of attack stage |
67 |
bool HoldAttack; |
68 |
long LoopStart; |
69 |
float Decay1Coeff; |
70 |
long Decay1StepsLeft; ///< number of sample points in Decay1 stage |
71 |
float Decay2Coeff; |
72 |
bool InfiniteSustain; |
73 |
float SustainLevel; |
74 |
float ReleaseCoeff; |
75 |
long ReleaseStepsLeft; ///< number of sample points til end of release stage |
76 |
bool ReleasePostponed; ///< If a "release" event occured in the previous audio fragment, but wasn't processed yet. |
77 |
|
78 |
inline long Min(long A, long B) { |
79 |
return (A > B) ? B : A; |
80 |
} |
81 |
}; |
82 |
|
83 |
#endif // __EG_VCA_H__ |