diff dsp/onsets/PeakPicking.cpp @ 225:49844bc8a895

* Queen Mary C++ DSP library

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dsp/onsets/PeakPicking.cpp	Wed Apr 05 17:35:59 2006 +0000
@@ -0,0 +1,137 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    QM DSP Library
+
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2005-2006 Christian Landone.
+    All rights reserved.
+*/
+
+#include "PeakPicking.h"
+#include "dsp/maths/Polyfit.h"
+
+
+//////////////////////////////////////////////////////////////////////
+// Construction/Destruction
+//////////////////////////////////////////////////////////////////////
+
+PeakPicking::PeakPicking( PPickParams Config )
+{
+    m_workBuffer = NULL;
+    initialise( Config );
+}
+
+PeakPicking::~PeakPicking()
+{
+    deInitialise();
+}
+
+void PeakPicking::initialise( PPickParams Config )
+{
+    m_DFLength = Config.length ;
+    Qfilta = Config.QuadThresh.a ;
+    Qfiltb = Config.QuadThresh.b ;
+    Qfiltc = Config.QuadThresh.c ;
+	
+    m_DFProcessingParams.length = m_DFLength; 
+    m_DFProcessingParams.LPOrd = Config.LPOrd; 
+    m_DFProcessingParams.LPACoeffs = Config.LPACoeffs; 
+    m_DFProcessingParams.LPBCoeffs = Config.LPBCoeffs; 
+    m_DFProcessingParams.winPre  = Config.WinT.pre;
+    m_DFProcessingParams.winPost = Config.WinT.post; 
+    m_DFProcessingParams.AlphaNormParam = Config.alpha;
+    m_DFProcessingParams.isMedianPositive = false;
+	
+    m_DFSmoothing = new DFProcess( m_DFProcessingParams );
+
+    m_workBuffer = new double[ m_DFLength ];
+    memset( m_workBuffer, 0, sizeof(double)*m_DFLength);
+}
+
+void PeakPicking::deInitialise()
+{
+    delete [] m_workBuffer;
+    delete m_DFSmoothing;
+    m_workBuffer = NULL;
+}
+
+void PeakPicking::process( double* src, unsigned int len, vector<int> &onsets )
+{
+    vector <double> m_maxima;	
+
+    // Signal conditioning 
+    m_DFSmoothing->process( src, m_workBuffer );
+	
+    for( unsigned int u = 0; u < len; u++)
+    {
+	m_maxima.push_back( m_workBuffer[ u ] );		
+    }
+	
+    quadEval( m_maxima, onsets );
+
+    for( int b = 0; b <  m_maxima.size(); b++)
+    {
+	src[ b ] = m_maxima[ b ];
+    }
+}
+
+int PeakPicking::quadEval( vector<double> &src, vector<int> &idx )
+{
+    unsigned int maxLength;
+
+    vector <int> m_maxIndex;
+    vector <int> m_onsetPosition;
+	
+    vector <double> m_maxFit;
+    vector <double> m_poly;
+    vector <double> m_err;
+
+    double p;
+
+    m_poly.push_back(0);
+    m_poly.push_back(0);
+    m_poly.push_back(0);
+
+    for(  int t = -2; t < 3; t++)
+    {
+	m_err.push_back( (double)t );
+    }
+    for( unsigned int i = 2; i < src.size() - 2; i++)
+    {
+	if( (src[ i ] > src[ i  - 1 ]) && (src[ i ] > src[ i  + 1 ]) && (src[ i ] > 0) )
+	{
+	    m_maxIndex.push_back(  i + 1 );
+	}
+    }
+
+    maxLength = m_maxIndex.size();
+
+    double selMax = 0;
+
+    for( unsigned int j = 0; j < maxLength ; j++)
+    {
+	for(  int k = -3; k < 2; k++)
+	{
+	    selMax = src[ m_maxIndex[j] + k ] ;
+	    m_maxFit.push_back(selMax);			
+	}
+
+	p = TPolyFit::PolyFit2( m_err, m_maxFit, m_poly);
+
+	double f = m_poly[0];
+	double g = m_poly[1];
+	double h = m_poly[2];
+
+	int kk = m_poly.size();
+		
+	if( h < -Qfilta || f  >  Qfiltc)
+	{
+	    idx.push_back( m_maxIndex[j] );
+	}
+
+	m_maxFit.erase( m_maxFit.begin(), m_maxFit.end() );
+    }
+
+    return 1;
+}