libs/Music/CumulativeDiffAlgo.h

   1 // Copyright 2004 "Gilles Degottex"
   2
   3 // This file is part of "Music"
   4
   5 // "Music" is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU Lesser General Public License as published by
   7 // the Free Software Foundation; either version 2.1 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // "Music" is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13 // GNU Lesser General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU Lesser General Public License
  16 // along with this program; if not, write to the Free Software
  17 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18
  19
  20 #ifndef _CumulativeDiffAlgo_h_
  21 #define _CumulativeDiffAlgo_h_
  22
  23 #include <vector>
  24 #include <deque>
  25 #include <complex>
  26 using namespace std;
  27 #include "Algorithm.h"
  28 #include "CumulativeDiff.h"
  29
  30 namespace Music
  31 {
  32         //! Compute period with a "classical" auto-correlation algorithm
  33         class CumulativeDiffAlgo : public Algorithm
  34         {
  35           protected:
  36                 double m_noise_threshold;
  37
  38                 size_t m_min_length;
  39                 size_t m_max_length;
  40
  41                 size_t m_wave_length;
  42
  43                 void init();
  44                 virtual void AFreqChanged()                                                     {init();}
  45                 virtual void samplingRateChanged()                                      {init();}
  46                 virtual void semitoneBoundsChanged()                            {init();}
  47
  48           public:
  49                 CumulativeDiffAlgo(double noise_treshold);
  50
  51                 virtual int getSampleAlgoLatency() const                {return 2*m_max_length;}
  52
  53                 double getNoiseThreshold() const                                {return m_noise_threshold;}
  54                 void setNoiseThreshold(double noise_threshold)  {m_noise_threshold=noise_threshold;}
  55                 void setMinMaxLength(size_t min_length, size_t max_length)
  56                                                                                 {m_min_length=min_length; m_max_length=max_length;}
  57
  58                 void apply(const deque<double>& buff);
  59
  60                 virtual bool hasNoteRecognized() const                  {return m_wave_length>0;}
  61                 virtual double getFondamentalWaveLength() const {return m_wave_length;}
  62
  63                 virtual ~CumulativeDiffAlgo(){}
  64         };
  65 }
  66
  67 #endif