CLAM-Development  1.4.0
RandomPhase.cxx
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
3  * UNIVERSITAT POMPEU FABRA
4  *
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  *
20  */
21 
22 #include "RandomPhase.hxx"
23 #include "ProcessingFactory.hxx"
24 
25 namespace CLAM
26 {
27 namespace Hidden
28 {
29  static const char * metadata[] = {
30  "key", "RandomPhase",
31  // "category", "Spectral Transformations",
32  // "description", "RandomPhase",
33  0
34  };
35  static FactoryRegistrator<ProcessingFactory, RandomPhase> reg = metadata;
36 }
37 
38 
39 bool RandomPhase::Do(const Spectrum& in, Spectrum& out)
40 {
41  srand(time(0));
42 
43  out = in;
44 
45  float amount = mAmount.GetLastValue() * 0.01;
46  float invAmount = 1. - amount;
47  DataArray& oPhase = out.GetPhaseBuffer();
48 
49  int spectrumSize = in.GetSize();
50 
51  int k = TWO_PI / RAND_MAX;
52  for(int i = 0; i<spectrumSize; i++)
53  {
54  oPhase[i] = oPhase[i]*invAmount + rand()* k * amount;
55  }
56  return true;
57 }
58 
59 
60 
61 }
62