CLAM-Development  1.4.0
SpectralReverse.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 "SpectralReverse.hxx"
23 #include "ProcessingFactory.hxx"
24 
25 namespace CLAM
26 {
27 
28 namespace Hidden
29 {
30  static const char * metadata[] = {
31  "key", "SpectralReverse",
32  // "category", "Spectral Transformations",
33  // "description", "SpectralReverse",
34  0
35  };
36  static FactoryRegistrator<ProcessingFactory, SpectralReverse> reg = metadata;
37 }
38 
39 bool SpectralReverse::Do(const Spectrum& in, Spectrum& out)
40 {
41  if (!mConfig.GetPreserveOuts())
42  {
43  out = in; //TODO big cludge for streaming
44  }
45  DataArray& inPhase = in.GetPhaseBuffer();
46  DataArray& inMag = in.GetMagBuffer();
47 
48  int spectrumSize = in.GetSize();
49 
50  TData spectralResolution = spectrumSize/in.GetSpectralRange();
51 
52  int mirrorPoint = Round(mAmount.GetLastValue()* spectralResolution);
53 
54  mMag.Resize(spectrumSize);
55  mMag.SetSize(spectrumSize);
56  mPhase.Resize(spectrumSize);
57  mPhase.SetSize(spectrumSize);
58  int i;
59  for(i = 0; i<mirrorPoint; i++)
60  {
61  mMag[i] = inMag[mirrorPoint-i];
62  mPhase[i] = inPhase[mirrorPoint-i];
63  }
64  for(i = mirrorPoint; i<spectrumSize; i++)
65  {
66  mMag[i] = inMag[spectrumSize-i+mirrorPoint];
67  mPhase[i] = inPhase[spectrumSize-i+mirrorPoint];
68  }
69  out.SetMagBuffer(mMag);
70  out.SetPhaseBuffer(mPhase);
71  return true;
72 }
73 
74 
75 }
76