libs/qm-dsp/dsp/chromagram/ConstantQ.h

   1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
   2
   3 /*
   4     QM DSP Library
   5
   6     Centre for Digital Music, Queen Mary, University of London.
   7     This file 2005-2006 Christian Landone.
   8
   9     This program is free software; you can redistribute it and/or
  10     modify it under the terms of the GNU General Public License as
  11     published by the Free Software Foundation; either version 2 of the
  12     License, or (at your option) any later version.  See the file
  13     COPYING included with this distribution for more information.
  14 */
  15
  16 #ifndef CONSTANTQ_H
  17 #define CONSTANTQ_H
  18
  19 #include <vector>
  20 #include "maths/MathAliases.h"
  21 #include "maths/MathUtilities.h"
  22
  23 struct CQConfig{
  24     unsigned int FS;   // samplerate
  25     double min;        // minimum frequency
  26     double max;        // maximum frequency
  27     unsigned int BPO;  // bins per octave
  28     double CQThresh;   // threshold
  29 };
  30
  31 class ConstantQ {
  32
  33 //public functions incl. sparsekernel so can keep out of loop in main
  34 public:
  35     void process( const double* FFTRe, const double* FFTIm,
  36                   double* CQRe, double* CQIm );
  37
  38     ConstantQ( CQConfig Config );
  39     ~ConstantQ();
  40
  41     double* process( const double* FFTData );
  42
  43     void sparsekernel();
  44
  45     double hamming(int len, int n) {
  46         double out = 0.54 - 0.46*cos(2*PI*n/len);
  47         return(out);
  48     }
  49
  50     int getnumwin() { return m_numWin;}
  51     double getQ() { return m_dQ;}
  52     int getK() {return m_uK ;}
  53     int getfftlength() { return m_FFTLength;}
  54     int gethop() { return m_hop;}
  55
  56 private:
  57     void initialise( CQConfig Config );
  58     void deInitialise();
  59
  60     double* m_CQdata;
  61     unsigned int m_FS;
  62     double m_FMin;
  63     double m_FMax;
  64     double m_dQ;
  65     double m_CQThresh;
  66     unsigned int m_numWin;
  67     unsigned int m_hop;
  68     unsigned int m_BPO;
  69     unsigned int m_FFTLength;
  70     unsigned int m_uK;
  71
  72     struct SparseKernel {
  73         std::vector<unsigned> is;
  74         std::vector<unsigned> js;
  75         std::vector<double> imag;
  76         std::vector<double> real;
  77     };
  78
  79     SparseKernel *m_sparseKernel;
  80 };
  81
  82
  83 #endif//CONSTANTQ_H
  84