CLAM-Development  1.4.0
Peakalizer.cxx
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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 "Peakalizer.hxx"
23 #include "ProcessingFactory.hxx"
24 
25 namespace CLAM
26 {
27 
28 namespace Hidden
29 {
30  static const char * metadata[] = {
31  "key", "Peakalizer",
32  "category", "Spectral Transformations",
33  "description", "Peakalizer",
34  0
35  };
36  static FactoryRegistrator<ProcessingFactory, Peakalizer> reg = metadata;
37 }
38 
39 bool Peakalizer::Do(const Spectrum& in, Spectrum& out)
40 {
41  if (!mConfig.GetPreserveOuts())
42  {
43  out = in; //TODO big cludge for streaming
44  }
45  DataArray& inMag = in.GetMagBuffer();
46  DataArray& outMag = out.GetMagBuffer();
47 
48  int spectrumSize = in.GetSize();
49  mMag.Resize(spectrumSize);
50  mMag.SetSize(spectrumSize);
51 
52  //control is supposed to be in dB's
53  TData threshold = log2lin(mThresholdCtl.GetLastValue());
54 
55  TData spectralResolution = spectrumSize/in.GetSpectralRange();
56  int bandwidth = Round(mBandWidthCtl.GetLastValue()* spectralResolution*0.5);
57 
58  int i,n;
59  //first we set everything to 0 (it could be done more efficiently)
60  for(i = 0; i<spectrumSize; i++)
61  {
62  mMag[i] = 0.;
63  }
64  for(i = 0; i<spectrumSize; i++)
65  {
66  if(inMag[i] > threshold)
67  {
68  for(n = i-bandwidth; n < i+bandwidth; n++)
69  {
70  mMag[n] = inMag[n];
71  }
72  }
73  }
74  out.SetMagBuffer(mMag);
75  return true;
76 }
77 
78 
79 
80 }
81