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
|
/**
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/>.
**/
//
// FFTtoAdditive.cpp
// modularSynth
//
// Created by Ryan Challinor on 4/24/13.
//
//
#include "FFTtoAdditive.h"
#include "ModularSynth.h"
#include "Profiler.h"
#include <cstring>
namespace
{
const int fftWindowSize = 1024;
const int fftFreqDomainSize = fftWindowSize / 2 + 1;
const int numPartials = fftFreqDomainSize - 1;
double sineBuffer[514] = { 0, 0.012268, 0.024536, 0.036804, 0.049042, 0.06131, 0.073547, 0.085785, 0.097992, 0.1102, 0.12241, 0.13455, 0.1467, 0.15884, 0.17093, 0.18301, 0.19507, 0.20709, 0.21909, 0.23105, 0.24295, 0.25485, 0.26669, 0.2785, 0.29025, 0.30197, 0.31366, 0.32529, 0.33685, 0.34839, 0.35986, 0.37128, 0.38266, 0.39395, 0.40521, 0.41641, 0.42752, 0.4386, 0.44958, 0.46051, 0.47137, 0.48215, 0.49286, 0.50351, 0.51407, 0.52457, 0.53497, 0.54529, 0.55554, 0.5657, 0.57578, 0.58575, 0.59567, 0.60547, 0.6152, 0.62482, 0.63437, 0.6438, 0.65314, 0.66238, 0.67151, 0.68057, 0.68951, 0.69833, 0.70706, 0.7157, 0.72421, 0.7326, 0.74091, 0.74908, 0.75717, 0.76514, 0.77298, 0.7807, 0.7883, 0.79581, 0.80316, 0.81042, 0.81754, 0.82455, 0.83142, 0.8382, 0.84482, 0.85132, 0.8577, 0.86392, 0.87006, 0.87604, 0.88187, 0.8876, 0.89319, 0.89862, 0.90396, 0.90912, 0.91415, 0.91907, 0.92383, 0.92847, 0.93295, 0.93729, 0.9415, 0.94556, 0.94949, 0.95325, 0.95691, 0.96039, 0.96375, 0.96692, 0.97, 0.9729, 0.97565, 0.97827, 0.98074, 0.98306, 0.98523, 0.98724, 0.98914, 0.99084, 0.99243, 0.99387, 0.99515, 0.99628, 0.99725, 0.99808, 0.99875, 0.99927, 0.99966, 0.99988, 0.99997, 0.99988, 0.99966, 0.99927, 0.99875, 0.99808, 0.99725, 0.99628, 0.99515, 0.99387, 0.99243, 0.99084, 0.98914, 0.98724, 0.98523, 0.98306, 0.98074, 0.97827, 0.97565, 0.9729, 0.97, 0.96692, 0.96375, 0.96039, 0.95691, 0.95325, 0.94949, 0.94556, 0.9415, 0.93729, 0.93295, 0.92847, 0.92383, 0.91907, 0.91415, 0.90912, 0.90396, 0.89862, 0.89319, 0.8876, 0.88187, 0.87604, 0.87006, 0.86392, 0.8577, 0.85132, 0.84482, 0.8382, 0.83142, 0.82455, 0.81754, 0.81042, 0.80316, 0.79581, 0.7883, 0.7807, 0.77298, 0.76514, 0.75717, 0.74908, 0.74091, 0.7326, 0.72421, 0.7157, 0.70706, 0.69833, 0.68951, 0.68057, 0.67151, 0.66238, 0.65314, 0.6438, 0.63437, 0.62482, 0.6152, 0.60547, 0.59567, 0.58575, 0.57578, 0.5657, 0.55554, 0.54529, 0.53497, 0.52457, 0.51407, 0.50351, 0.49286, 0.48215, 0.47137, 0.46051, 0.44958, 0.4386, 0.42752, 0.41641, 0.40521, 0.39395, 0.38266, 0.37128, 0.35986, 0.34839, 0.33685, 0.32529, 0.31366, 0.30197, 0.29025, 0.2785, 0.26669, 0.25485, 0.24295, 0.23105, 0.21909, 0.20709, 0.19507, 0.18301, 0.17093, 0.15884, 0.1467, 0.13455, 0.12241, 0.1102, 0.097992, 0.085785, 0.073547, 0.06131, 0.049042, 0.036804, 0.024536, 0.012268, 0, -0.012268, -0.024536, -0.036804, -0.049042, -0.06131, -0.073547, -0.085785, -0.097992, -0.1102, -0.12241, -0.13455, -0.1467, -0.15884, -0.17093, -0.18301, -0.19507, -0.20709, -0.21909, -0.23105, -0.24295, -0.25485, -0.26669, -0.2785, -0.29025, -0.30197, -0.31366, -0.32529, -0.33685, -0.34839, -0.35986, -0.37128, -0.38266, -0.39395, -0.40521, -0.41641, -0.42752, -0.4386, -0.44958, -0.46051, -0.47137, -0.48215, -0.49286, -0.50351, -0.51407, -0.52457, -0.53497, -0.54529, -0.55554, -0.5657, -0.57578, -0.58575, -0.59567, -0.60547, -0.6152, -0.62482, -0.63437, -0.6438, -0.65314, -0.66238, -0.67151, -0.68057, -0.68951, -0.69833, -0.70706, -0.7157, -0.72421, -0.7326, -0.74091, -0.74908, -0.75717, -0.76514, -0.77298, -0.7807, -0.7883, -0.79581, -0.80316, -0.81042, -0.81754, -0.82455, -0.83142, -0.8382, -0.84482, -0.85132, -0.8577, -0.86392, -0.87006, -0.87604, -0.88187, -0.8876, -0.89319, -0.89862, -0.90396, -0.90912, -0.91415, -0.91907, -0.92383, -0.92847, -0.93295, -0.93729, -0.9415, -0.94556, -0.94949, -0.95325, -0.95691, -0.96039, -0.96375, -0.96692, -0.97, -0.9729, -0.97565, -0.97827, -0.98074, -0.98306, -0.98523, -0.98724, -0.98914, -0.99084, -0.99243, -0.99387, -0.99515, -0.99628, -0.99725, -0.99808, -0.99875, -0.99927, -0.99966, -0.99988, -0.99997, -0.99988, -0.99966, -0.99927, -0.99875, -0.99808, -0.99725, -0.99628, -0.99515, -0.99387, -0.99243, -0.99084, -0.98914, -0.98724, -0.98523, -0.98306, -0.98074, -0.97827, -0.97565, -0.9729, -0.97, -0.96692, -0.96375, -0.96039, -0.95691, -0.95325, -0.94949, -0.94556, -0.9415, -0.93729, -0.93295, -0.92847, -0.92383, -0.91907, -0.91415, -0.90912, -0.90396, -0.89862, -0.89319, -0.8876, -0.88187, -0.87604, -0.87006, -0.86392, -0.8577, -0.85132, -0.84482, -0.8382, -0.83142, -0.82455, -0.81754, -0.81042, -0.80316, -0.79581, -0.7883, -0.7807, -0.77298, -0.76514, -0.75717, -0.74908, -0.74091, -0.7326, -0.72421, -0.7157, -0.70706, -0.69833, -0.68951, -0.68057, -0.67151, -0.66238, -0.65314, -0.6438, -0.63437, -0.62482, -0.6152, -0.60547, -0.59567, -0.58575, -0.57578, -0.5657, -0.55554, -0.54529, -0.53497, -0.52457, -0.51407, -0.50351, -0.49286, -0.48215, -0.47137, -0.46051, -0.44958, -0.4386, -0.42752, -0.41641, -0.40521, -0.39395, -0.38266, -0.37128, -0.35986, -0.34839, -0.33685, -0.32529, -0.31366, -0.30197, -0.29025, -0.2785, -0.26669, -0.25485, -0.24295, -0.23105, -0.21909, -0.20709, -0.19507, -0.18301, -0.17093, -0.15884, -0.1467, -0.13455, -0.12241, -0.1102, -0.097992, -0.085785, -0.073547, -0.06131, -0.049042, -0.036804, -0.024536, -0.012268, 0, 0.012268 };
}
FFTtoAdditive::FFTtoAdditive()
: IAudioProcessor(gBufferSize)
, mFFT(fftWindowSize)
, mRollingInputBuffer(fftWindowSize)
, mRollingOutputBuffer(fftWindowSize)
, mFFTData(fftWindowSize, fftFreqDomainSize)
{
// Generate a window with a single raised cosine from N/4 to 3N/4
mWindower = new float[fftWindowSize];
for (int i = 0; i < fftWindowSize; ++i)
mWindower[i] = -.5 * cos(FTWO_PI * i / fftWindowSize) + .5;
mPhaseInc = new float[numPartials];
for (int i = 0; i < numPartials; ++i)
{
float freq = i / float(fftFreqDomainSize) * (gNyquistLimit / 2);
mPhaseInc[i] = GetPhaseInc(freq);
}
for (int i = 0; i < fftFreqDomainSize; ++i)
{
mFFTData.mRealValues[i] = 0;
mFFTData.mImaginaryValues[i] = 0;
}
}
void FFTtoAdditive::CreateUIControls()
{
IDrawableModule::CreateUIControls();
mInputSlider = new FloatSlider(this, "input", 5, 29, 100, 15, &mInputPreamp, 0, 2);
mValue1Slider = new FloatSlider(this, "value 1", 5, 47, 100, 15, &mValue1, 0, 2);
mVolumeSlider = new FloatSlider(this, "volume", 5, 65, 100, 15, &mVolume, 0, 2);
mDryWetSlider = new FloatSlider(this, "dry/wet", 5, 83, 100, 15, &mDryWet, 0, 1);
mValue2Slider = new FloatSlider(this, "value 2", 5, 101, 100, 15, &mValue2, 0, 1);
mValue3Slider = new FloatSlider(this, "value 3", 5, 119, 100, 15, &mValue3, 0, 1);
mPhaseOffsetSlider = new FloatSlider(this, "phase off", 5, 137, 100, 15, &mPhaseOffset, 0, FTWO_PI);
}
FFTtoAdditive::~FFTtoAdditive()
{
delete[] mWindower;
}
void FFTtoAdditive::Process(double time)
{
PROFILER(FFTtoAdditive);
IAudioReceiver* target = GetTarget();
if (target == nullptr || !mEnabled)
return;
ComputeSliders(0);
SyncBuffers();
float inputPreampSq = mInputPreamp * mInputPreamp;
float volSq = mVolume * mVolume;
int bufferSize = GetBuffer()->BufferSize();
mRollingInputBuffer.WriteChunk(GetBuffer()->GetChannel(0), bufferSize, 0);
//copy rolling input buffer into working buffer and window it
mRollingInputBuffer.ReadChunk(mFFTData.mTimeDomain, fftWindowSize, 0, 0);
Mult(mFFTData.mTimeDomain, mWindower, fftWindowSize);
Mult(mFFTData.mTimeDomain, inputPreampSq, fftWindowSize);
mFFT.Forward(mFFTData.mTimeDomain,
mFFTData.mRealValues,
mFFTData.mImaginaryValues);
for (int i = 0; i < fftFreqDomainSize; ++i)
{
float real = mFFTData.mRealValues[i];
float imag = mFFTData.mImaginaryValues[i];
//cartesian to polar
float amp = 2. * sqrtf(real * real + imag * imag);
float phase = atan2(imag, real);
mFFTData.mRealValues[i] = amp / (fftWindowSize / 2);
mFFTData.mImaginaryValues[i] = phase;
}
float* out = target->GetBuffer()->GetChannel(0);
for (int i = 0; i < bufferSize; ++i)
{
float write = 0;
for (int j = 1; j < numPartials; ++j)
{
float phase = ((mFFTData.mImaginaryValues[j + 1] + i * mPhaseInc[j]) / FTWO_PI) * 512;
float sample = SinSample(phase) * mFFTData.mRealValues[j + 1] * volSq * .4f;
write += sample;
}
GetVizBuffer()->Write(write, 0);
out[i] += write;
time += gInvSampleRateMs;
}
GetBuffer()->Reset();
}
float FFTtoAdditive::SinSample(float phase)
{
int intPhase = int(phase) % 512;
if (intPhase < 0)
intPhase += 512;
float remainder = phase - int(phase);
float retVal = ((1 - remainder) * sineBuffer[intPhase] + remainder * sineBuffer[1 + intPhase]);
return retVal;
}
void FFTtoAdditive::DrawModule()
{
if (Minimized() || IsVisible() == false)
return;
mInputSlider->Draw();
mValue1Slider->Draw();
mVolumeSlider->Draw();
mDryWetSlider->Draw();
mValue2Slider->Draw();
mValue3Slider->Draw();
mPhaseOffsetSlider->Draw();
DrawViz();
}
void FFTtoAdditive::DrawViz()
{
ofPushStyle();
int zeroHeight = 240;
for (int i = 1; i < RAZOR_HISTORY - 1; ++i)
{
float age = 1 - float(i) / RAZOR_HISTORY;
ofSetColor(0, 200 * age, 255 * age);
for (int x = 0; x < VIZ_WIDTH; ++x)
{
int intHeight = mPeakHistory[(i + mHistoryPtr) % RAZOR_HISTORY][x];
int intHeightNext = mPeakHistory[(i + mHistoryPtr + 1) % RAZOR_HISTORY][x];
if (intHeight != 0)
{
int xpos = 10 + x + i;
int ypos = zeroHeight - intHeight - i;
int xposNext = xpos;
int yposNext = ypos;
if (intHeightNext != 0)
{
xposNext = 10 + x + i + 1;
yposNext = zeroHeight - intHeightNext - i + 1;
}
if (xpos < 1020)
ofLine(xpos, ypos, xposNext, yposNext);
}
}
}
std::memset(mPeakHistory[mHistoryPtr], 0, sizeof(float) * VIZ_WIDTH);
for (int i = 1; i <= numPartials; ++i)
{
float height = mFFTData.mRealValues[i - 1];
int intHeight = int(height * 100.0f);
if (intHeight == 0)
{
if (height > 0)
intHeight = 1;
if (height < 0)
intHeight = -1;
}
if (intHeight < 0)
{
ofSetColor(255, 0, 0);
intHeight *= -1;
}
else
{
ofSetColor(255, 255, 255);
}
int x = int(ofMap(i, 4, numPartials, 0, VIZ_WIDTH, true));
ofLine(10 + x, zeroHeight, 10 + x, zeroHeight - intHeight);
mPeakHistory[mHistoryPtr][x] = intHeight;
}
mHistoryPtr = (mHistoryPtr - 1 + RAZOR_HISTORY) % RAZOR_HISTORY;
ofPopStyle();
}
void FFTtoAdditive::CheckboxUpdated(Checkbox* checkbox, double time)
{
}
void FFTtoAdditive::LoadLayout(const ofxJSONElement& moduleInfo)
{
mModuleSaveData.LoadString("target", moduleInfo);
SetUpFromSaveData();
}
void FFTtoAdditive::SetUpFromSaveData()
{
SetTarget(TheSynth->FindModule(mModuleSaveData.GetString("target")));
}
|
