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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
|
/* ========================================
* PurestGain - PurestGain.h
* Copyright (c) 2016 airwindows, All rights reserved
* ======================================== */
#ifndef __PurestGain_H
#include "PurestGain.h"
#endif
void PurestGain::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames)
{
float* in1 = inputs[0];
float* in2 = inputs[1];
float* out1 = outputs[0];
float* out2 = outputs[1];
double overallscale = 1.0;
overallscale /= 44100.0;
overallscale *= getSampleRate();
double inputgain = (A * 80.0)-40.0;
if (settingchase != inputgain) {
chasespeed *= 2.0;
settingchase = inputgain;
//increment the slowness for each fader movement
//continuous alteration makes it react smoother
//sudden jump to setting, not so much
}
if (chasespeed > 2500.0) chasespeed = 2500.0;
//bail out if it's too extreme
if (gainchase < -60.0) {
gainchase = pow(10.0,inputgain/20.0);
//shouldn't even be a negative number
//this is about starting at whatever's set, when
//plugin is instantiated.
//Otherwise it's the target, in dB.
}
double targetgain;
//done with top controller
double targetBgain = B;
if (gainBchase < 0.0) gainBchase = targetBgain;
//this one is not a dB value, but straight multiplication
//done with slow fade controller
double outputgain;
long double inputSampleL;
long double inputSampleR;
//A is 0-1 (you can't feed other values to VST hosts, it's always 0-1 internally)
//B is 0-1 and you need to multiply it by 100 if you want to use the 'percent'
//C is 0-1 and if you can use a 0-1 value you can use it directly
//D is 0-1 and you must set global parameters in PurestGain.SetParameter() to use it as a 'popup'
//assign values here, possibly using const values as they won't change in this context
while (--sampleFrames >= 0)
{
targetgain = pow(10.0,settingchase/20.0);
//now we have the target in our temp variable
chasespeed *= 0.9999;
chasespeed -= 0.01;
if (chasespeed < 350.0) chasespeed = 350.0;
//we have our chase speed compensated for recent fader activity
gainchase = (((gainchase*chasespeed)+targetgain)/(chasespeed+1.0));
//gainchase is chasing the target, as a simple multiply gain factor
gainBchase = (((gainBchase*4000)+targetBgain)/4001);
//gainchase is chasing the target, as a simple multiply gain factor
outputgain = gainchase * gainBchase;
//directly multiply the dB gain by the straight multiply gain
inputSampleL = *in1;
inputSampleR = *in2;
if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
static int noisesource = 0;
//this declares a variable before anything else is compiled. It won't keep assigning
//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
//but it lets me add this denormalization fix in a single place rather than updating
//it in three different locations. The variable isn't thread-safe but this is only
//a random seed and we can share it with whatever.
noisesource = noisesource % 1700021; noisesource++;
int residue = noisesource * noisesource;
residue = residue % 170003; residue *= residue;
residue = residue % 17011; residue *= residue;
residue = residue % 1709; residue *= residue;
residue = residue % 173; residue *= residue;
residue = residue % 17;
double applyresidue = residue;
applyresidue *= 0.00000001;
applyresidue *= 0.00000001;
inputSampleL = applyresidue;
}
if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
static int noisesource = 0;
noisesource = noisesource % 1700021; noisesource++;
int residue = noisesource * noisesource;
residue = residue % 170003; residue *= residue;
residue = residue % 17011; residue *= residue;
residue = residue % 1709; residue *= residue;
residue = residue % 173; residue *= residue;
residue = residue % 17;
double applyresidue = residue;
applyresidue *= 0.00000001;
applyresidue *= 0.00000001;
inputSampleR = applyresidue;
//this denormalization routine produces a white noise at -300 dB which the noise
//shaping will interact with to produce a bipolar output, but the noise is actually
//all positive. That should stop any variables from going denormal, and the routine
//only kicks in if digital black is input. As a final touch, if you save to 24-bit
//the silence will return to being digital black again.
}
if (1.0 == outputgain)
{
*out1 = *in1;
*out2 = *in2;
} else {
inputSampleL *= outputgain;
inputSampleR *= outputgain;
//stereo 32 bit dither, made small and tidy.
int expon; frexpf((float)inputSampleL, &expon);
long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
frexpf((float)inputSampleR, &expon);
dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
//end 32 bit dither
*out1 = inputSampleL;
*out2 = inputSampleR;
}
*in1++;
*in2++;
*out1++;
*out2++;
}
}
void PurestGain::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames)
{
double* in1 = inputs[0];
double* in2 = inputs[1];
double* out1 = outputs[0];
double* out2 = outputs[1];
double overallscale = 1.0;
overallscale /= 44100.0;
overallscale *= getSampleRate();
double inputgain = (A * 80.0)-40.0;
if (settingchase != inputgain) {
chasespeed *= 2.0;
settingchase = inputgain;
//increment the slowness for each fader movement
//continuous alteration makes it react smoother
//sudden jump to setting, not so much
}
if (chasespeed > 2500.0) chasespeed = 2500.0;
//bail out if it's too extreme
if (gainchase < -60.0) {
gainchase = pow(10.0,inputgain/20.0);
//shouldn't even be a negative number
//this is about starting at whatever's set, when
//plugin is instantiated.
//Otherwise it's the target, in dB.
}
double targetgain;
//done with top controller
double targetBgain = B;
if (gainBchase < 0.0) gainBchase = targetBgain;
//this one is not a dB value, but straight multiplication
//done with slow fade controller
double outputgain;
long double inputSampleL;
long double inputSampleR;
while (--sampleFrames >= 0)
{
targetgain = pow(10.0,settingchase/20.0);
//now we have the target in our temp variable
chasespeed *= 0.9999;
chasespeed -= 0.01;
if (chasespeed < 350.0) chasespeed = 350.0;
//we have our chase speed compensated for recent fader activity
gainchase = (((gainchase*chasespeed)+targetgain)/(chasespeed+1.0));
//gainchase is chasing the target, as a simple multiply gain factor
gainBchase = (((gainBchase*4000)+targetBgain)/4001);
//gainchase is chasing the target, as a simple multiply gain factor
outputgain = gainchase * gainBchase;
//directly multiply the dB gain by the straight multiply gain
inputSampleL = *in1;
inputSampleR = *in2;
if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
static int noisesource = 0;
//this declares a variable before anything else is compiled. It won't keep assigning
//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
//but it lets me add this denormalization fix in a single place rather than updating
//it in three different locations. The variable isn't thread-safe but this is only
//a random seed and we can share it with whatever.
noisesource = noisesource % 1700021; noisesource++;
int residue = noisesource * noisesource;
residue = residue % 170003; residue *= residue;
residue = residue % 17011; residue *= residue;
residue = residue % 1709; residue *= residue;
residue = residue % 173; residue *= residue;
residue = residue % 17;
double applyresidue = residue;
applyresidue *= 0.00000001;
applyresidue *= 0.00000001;
inputSampleL = applyresidue;
}
if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
static int noisesource = 0;
noisesource = noisesource % 1700021; noisesource++;
int residue = noisesource * noisesource;
residue = residue % 170003; residue *= residue;
residue = residue % 17011; residue *= residue;
residue = residue % 1709; residue *= residue;
residue = residue % 173; residue *= residue;
residue = residue % 17;
double applyresidue = residue;
applyresidue *= 0.00000001;
applyresidue *= 0.00000001;
inputSampleR = applyresidue;
//this denormalization routine produces a white noise at -300 dB which the noise
//shaping will interact with to produce a bipolar output, but the noise is actually
//all positive. That should stop any variables from going denormal, and the routine
//only kicks in if digital black is input. As a final touch, if you save to 24-bit
//the silence will return to being digital black again.
}
if (1.0 == outputgain)
{
*out1 = *in1;
*out2 = *in2;
} else {
inputSampleL *= outputgain;
inputSampleR *= outputgain;
//stereo 64 bit dither, made small and tidy.
int expon; frexp((double)inputSampleL, &expon);
long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
dither /= 536870912.0; //needs this to scale to 64 bit zone
inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
frexp((double)inputSampleR, &expon);
dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
dither /= 536870912.0; //needs this to scale to 64 bit zone
inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
//end 64 bit dither
*out1 = inputSampleL;
*out2 = inputSampleR;
}
*in1++;
*in2++;
*out1++;
*out2++;
}
}
|
