1 // Copyright 2014 Olivier Gillet.
2 //
3 // Author: Olivier Gillet (ol.gillet@gmail.com)
4 //
5 // Permission is hereby granted, free of charge, to any person obtaining a copy
6 // of this software and associated documentation files (the "Software"), to deal
7 // in the Software without restriction, including without limitation the rights
8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 // copies of the Software, and to permit persons to whom the Software is
10 // furnished to do so, subject to the following conditions:
11 //
12 // The above copyright notice and this permission notice shall be included in
13 // all copies or substantial portions of the Software.
14 //
15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21 // THE SOFTWARE.
22 //
23 // See http://creativecommons.org/licenses/MIT/ for more information.
24 //
25 // -----------------------------------------------------------------------------
26 //
27 // Granular diffuser.
28 
29 #ifndef ELEMENTS_DSP_FX_DIFFUSER_H_
30 #define ELEMENTS_DSP_FX_DIFFUSER_H_
31 
32 #include "stmlib/stmlib.h"
33 
34 #include "elements/dsp/fx/fx_engine.h"
35 
36 namespace elements {
37 
38 class Diffuser {
39  public:
Diffuser()40   Diffuser() { }
~Diffuser()41   ~Diffuser() { }
42 
Init(float * buffer)43   void Init(float* buffer) {
44     engine_.Init(buffer);
45   }
46 
Process(float * in_out,size_t size)47   void Process(float* in_out, size_t size) {
48     typedef E::Reserve<126,
49       E::Reserve<180,
50       E::Reserve<269,
51       E::Reserve<444> > > > Memory;
52     E::DelayLine<Memory, 0> ap1;
53     E::DelayLine<Memory, 1> ap2;
54     E::DelayLine<Memory, 2> ap3;
55     E::DelayLine<Memory, 3> ap4;
56     E::Context c;
57     const float kap = 0.625f;
58     while (size--) {
59       engine_.Start(&c);
60       c.Read(*in_out);
61       c.Read(ap1 TAIL, kap);
62       c.WriteAllPass(ap1, -kap);
63       c.Read(ap2 TAIL, kap);
64       c.WriteAllPass(ap2, -kap);
65       c.Read(ap3 TAIL, kap);
66       c.WriteAllPass(ap3, -kap);
67       c.Read(ap4 TAIL, kap);
68       c.WriteAllPass(ap4, -kap);
69       c.Write(*in_out, 0.0f);
70       ++in_out;
71     }
72   }
73 
74  private:
75   typedef FxEngine<1024, FORMAT_32_BIT> E;
76   E engine_;
77 
78   DISALLOW_COPY_AND_ASSIGN(Diffuser);
79 };
80 
81 }  // namespace elements
82 
83 #endif  // ELEMENTS_DSP_FX_DIFFUSER_H_
84