1 /*
2 * mdaDetuneProcessor.cpp
3 * mda-vst3
4 *
5 * Created by Arne Scheffler on 6/14/08.
6 *
7 * mda VST Plug-ins
8 *
9 * Copyright (c) 2008 Paul Kellett
10 *
11 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
14 *
15 */
16
17 #include "mdaDetuneProcessor.h"
18 #include "mdaDetuneController.h"
19
20 #include <math.h>
21
22 namespace Steinberg {
23 namespace Vst {
24 namespace mda {
25
26 #define BUFMAX 4096
27
28 //-----------------------------------------------------------------------------
29 FUID DetuneProcessor::uid (0x4CCBED11, 0xE28346A6, 0xA91EC86C, 0x9E85EDF8);
30
31 //-----------------------------------------------------------------------------
DetuneProcessor()32 DetuneProcessor::DetuneProcessor ()
33 {
34 setControllerClass (DetuneController::uid);
35 allocParameters (4);
36 buf=win=0;
37 }
38
39 //-----------------------------------------------------------------------------
~DetuneProcessor()40 DetuneProcessor::~DetuneProcessor ()
41 {
42 }
43
44 //-----------------------------------------------------------------------------
initialize(FUnknown * context)45 tresult PLUGIN_API DetuneProcessor::initialize (FUnknown* context)
46 {
47 tresult res = BaseProcessor::initialize (context);
48 if (res == kResultTrue)
49 {
50 addAudioInput (USTRING("Stereo In"), SpeakerArr::kStereo);
51 addAudioOutput (USTRING("Stereo Out"), SpeakerArr::kStereo);
52
53 params[0] = 0.40f; //fine
54 params[1] = 0.40f; //mix
55 params[2] = 0.50f; //output
56 params[3] = 0.50f; //chunksize
57
58 buf = new float[BUFMAX];
59 win = new float[BUFMAX];
60 buflen=0;
61
62 recalculate ();
63 }
64 return res;
65 }
66
67 //-----------------------------------------------------------------------------
terminate()68 tresult PLUGIN_API DetuneProcessor::terminate ()
69 {
70 if (buf) delete [] buf;
71 if (win) delete [] win;
72 buf=win=0;
73 return BaseProcessor::terminate ();
74 }
75
76 //-----------------------------------------------------------------------------
setActive(TBool state)77 tresult PLUGIN_API DetuneProcessor::setActive (TBool state)
78 {
79 if (state)
80 {
81 memset (buf, 0, BUFMAX * sizeof (float));
82 pos0 = 0; pos1 = pos2 = 0.0f;
83 }
84 return BaseProcessor::setActive (state);
85 }
86
87 //-----------------------------------------------------------------------------
doProcessing(ProcessData & data)88 void DetuneProcessor::doProcessing (ProcessData& data)
89 {
90 int32 sampleFrames = data.numSamples;
91
92 float* in1 = data.inputs[0].channelBuffers32[0];
93 float* in2 = data.inputs[0].channelBuffers32[1];
94 float* out1 = data.outputs[0].channelBuffers32[0];
95 float* out2 = data.outputs[0].channelBuffers32[1];
96
97 float a, b, c, d;
98 float x, w=wet, y =dry, p1=pos1, p1f, d1=dpos1;
99 float p2=pos2, d2=dpos2;
100 int32 p0=pos0, p1i, p2i;
101 int32 l=buflen-1, lh=buflen>>1;
102 float lf = (float)buflen;
103
104 --in1;
105 --in2;
106 --out1;
107 --out2;
108 while (--sampleFrames >= 0) //had to disable optimization /Og in MSVC++5!
109 {
110 a = *++in1;
111 b = *++in2;
112
113 c = y * a;
114 d = y * b;
115
116 --p0 &= l;
117 *(buf + p0) = w * (a + b); //input
118
119 p1 -= d1;
120 if (p1<0.0f) p1 += lf; //output
121 p1i = (int32)p1;
122 p1f = p1 - (float)p1i;
123 a = *(buf + p1i);
124 ++p1i &= l;
125 a += p1f * (*(buf + p1i) - a); //linear interpolation
126
127 p2i = (p1i + lh) & l; //180-degree ouptut
128 b = *(buf + p2i);
129 ++p2i &= l;
130 b += p1f * (*(buf + p2i) - b); //linear interpolation
131
132 p2i = (p1i - p0) & l; //crossfade
133 x = *(win + p2i);
134 //++p2i &= l;
135 //x += p1f * (*(win + p2i) - x); //linear interpolation (doesn't do much)
136 c += b + x * (a - b);
137
138 p2 -= d2; //repeat for downwards shift - can't see a more efficient way?
139 if (p2<0.0f) p2 += lf; //output
140 p1i = (int32)p2;
141 p1f = p2 - (float)p1i;
142 a = *(buf + p1i);
143 ++p1i &= l;
144 a += p1f * (*(buf + p1i) - a); //linear interpolation
145
146 p2i = (p1i + lh) & l; //180-degree ouptut
147 b = *(buf + p2i);
148 ++p2i &= l;
149 b += p1f * (*(buf + p2i) - b); //linear interpolation
150
151 p2i = (p1i - p0) & l; //crossfade
152 x = *(win + p2i);
153 //++p2i &= l;
154 //x += p1f * (*(win + p2i) - x); //linear interpolation (doesn't do much)
155 d += b + x * (a - b);
156
157 *++out1 = c;
158 *++out2 = d;
159 }
160 pos0=p0; pos1=p1; pos2=p2;
161 }
162
163 //-----------------------------------------------------------------------------
recalculate()164 void DetuneProcessor::recalculate ()
165 {
166 int32 tmp;
167
168 semi = 3.0f * params[0] * params[0] * params[0];
169 dpos2 = (float)pow (1.0594631f, semi);
170 dpos1 = 1.0f / dpos2;
171
172 wet = (float)pow (10.0f, (float)(2.0f * params[2] - 1.0f));
173 dry = wet - wet * params[1] * params[1];
174 wet = (wet + wet - wet * params[1]) * params[1];
175
176 tmp = 1 << (8 + (int32)(4.9f * params[3]));
177
178 if (tmp!=buflen) //recalculate crossfade window
179 {
180 buflen = tmp;
181 bufres = 1000.0f * (float)buflen / getSampleRate ();
182
183 int32 i; //hanning half-overlap-and-add
184 double p=0.0, dp=6.28318530718/buflen;
185 for(i = 0;i<buflen;i++) { win[i] = (float)(0.5 - 0.5 * cos(p)); p+=dp; }
186 }
187 }
188
189 }}} // namespaces
190
191