CLAM-Development  1.4.0
CircularPeaksToPCP.hxx
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1 /*
2  * Copyright (c) 2001-2006 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 #ifndef CircularPeaksToPCP_hxx
23 #define CircularPeaksToPCP_hxx
24 #include <list>
25 #include <vector>
26 #include <cmath>
27 
28 namespace Simac
29 {
30 
40 {
41 public:
42  typedef std::vector<std::pair<double, double> > PeakList;
43  typedef std::vector<double> PCP;
44 private:
45  PCP _output;
46  bool _windowingActivated;
47  static const unsigned nSemitones=12;
48 public:
50  {
51  _output.resize(nSemitones);
52  _windowingActivated=false;
53  }
55  {
56  }
58  {
59  _windowingActivated=true;
60  }
61  static double windowedValue(double position, double value)
62  {
63  return value* (0.54 - 0.46*std::cos(2*M_PI*(position+.5)));
64  }
65  void doIt(const PeakList & peaks)
66  {
67  for (unsigned i=0; i<nSemitones; i++)
68  _output[i]=0;
69  const unsigned nPeaks=peaks.size();
70  for (unsigned i=0; i<nPeaks; i++)
71  {
72  int quantizedSemitone = int(peaks[i].first + .5);
73  unsigned semitone = (quantizedSemitone+nSemitones)%nSemitones;
74  if (_windowingActivated)
75  _output[semitone] += windowedValue(peaks[i].first,peaks[i].second);
76  else
77  _output[semitone] += peaks[i].second;
78  }
79  }
80 
81  const PCP & output() const
82  {
83  return _output;
84  }
85 };
86 
87 } // namespace Simac
88 
89 #endif// CircularPeaksToPCP_hxx
90