1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/**
bespoke synth, a software modular synthesizer
Copyright (C) 2021 Ryan Challinor (contact: awwbees@gmail.com)
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 3 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, see <http://www.gnu.org/licenses/>.
**/
//
// Compressor.h
// modularSynth
//
// Created by Ryan Challinor on 2/11/13.
//
//
#pragma once
#include "IAudioEffect.h"
#include "Slider.h"
#include "Checkbox.h"
#include "RollingBuffer.h"
//-------------------------------------------------------------
// DC offset (to prevent denormal)
//-------------------------------------------------------------
// USE:
// 1. init envelope state to DC_OFFSET before processing
// 2. add to input before envelope runtime function
static const double DC_OFFSET = 1.0E-25;
//-------------------------------------------------------------
// envelope detector
//-------------------------------------------------------------
class EnvelopeDetector
{
public:
EnvelopeDetector(double ms = 1.0);
virtual ~EnvelopeDetector() {}
// time constant
virtual void setTc(double ms);
virtual double getTc(void) const { return ms_; }
// runtime function
void run(double in, double& state)
{
state = in + coef_ * (state - in);
}
protected:
double ms_{ 1 }; // time constant in ms
double coef_{ 0 }; // runtime coefficient
virtual void setCoef(void); // coef calculation
}; // end SimpleComp class
//-------------------------------------------------------------
// attack/release envelope
//-------------------------------------------------------------
class AttRelEnvelope
{
public:
AttRelEnvelope(double att_ms = 10.0, double rel_ms = 100.0);
virtual ~AttRelEnvelope() {}
// attack time constant
virtual void setAttack(double ms);
virtual double getAttack(void) const { return att_.getTc(); }
// release time constant
virtual void setRelease(double ms);
virtual double getRelease(void) const { return rel_.getTc(); }
// runtime function
void run(double in, double& state)
{
/* assumes that:
* positive delta = attack
* negative delta = release
* good for linear & log values
*/
if (in > state)
att_.run(in, state); // attack
else
rel_.run(in, state); // release
}
private:
EnvelopeDetector att_;
EnvelopeDetector rel_;
}; // end AttRelEnvelope class
class Compressor : public IAudioEffect, public IFloatSliderListener
{
public:
Compressor();
static IAudioEffect* Create() { return new Compressor(); }
void CreateUIControls() override;
//IAudioEffect
void ProcessAudio(double time, ChannelBuffer* buffer) override;
void SetEnabled(bool enabled) override { mEnabled = enabled; }
std::string GetType() override { return "compressor"; }
void CheckboxUpdated(Checkbox* checkbox, double time) override;
void FloatSliderUpdated(FloatSlider* slider, float oldVal, double time) override;
bool IsEnabled() const override { return mEnabled; }
private:
//IDrawableModule
void DrawModule() override;
void GetModuleDimensions(float& width, float& height) override
{
width = mWidth;
height = mHeight;
}
float mMix{ 1 };
float mDrive{ 1 };
float mThreshold{ -24 };
float mRatio{ 4 };
float mAttack{ .1f };
float mRelease{ 100 };
float mLookahead{ 3 };
float mOutputAdjust{ 1 };
FloatSlider* mMixSlider{ nullptr };
FloatSlider* mDriveSlider{ nullptr };
FloatSlider* mThresholdSlider{ nullptr };
FloatSlider* mRatioSlider{ nullptr };
FloatSlider* mAttackSlider{ nullptr };
FloatSlider* mReleaseSlider{ nullptr };
FloatSlider* mLookaheadSlider{ nullptr };
FloatSlider* mOutputAdjustSlider{ nullptr };
double mCurrentInputDb{ 0 };
double mOutputGain{ 1 };
float mWidth{ 200 };
float mHeight{ 20 };
// runtime variables
double envdB_{ DC_OFFSET }; // over-threshold envelope (dB)
AttRelEnvelope mEnv;
RollingBuffer mDelayBuffer;
};
|
