cannam@0: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
cannam@0: 
cannam@0: /*
cannam@0:     QM DSP Library
cannam@0: 
cannam@0:     Centre for Digital Music, Queen Mary, University of London.
cannam@0:     This file copyright 2005-2006 Christian Landone.
cannam@0:     All rights reserved.
cannam@0: */
cannam@0: 
cannam@0: #include <iostream>
cannam@0: #include <cmath>
cannam@0: #include "dsp/maths/MathUtilities.h"
cannam@0: #include "Chromagram.h"
cannam@0: 
cannam@0: //----------------------------------------------------------------------------
cannam@0: 
cannam@0: Chromagram::Chromagram( ChromaConfig Config ) 
cannam@0: {
cannam@0:     initialise( Config );
cannam@0: }
cannam@0: 
cannam@0: int Chromagram::initialise( ChromaConfig Config )
cannam@0: {	
cannam@0:     m_FMin = Config.min;		// min freq
cannam@0:     m_FMax = Config.max;		// max freq
cannam@0:     m_BPO  = Config.BPO;		// bins per octave
cannam@0:     isNormalised = Config.isNormalised; // true if frame normalisation is required
cannam@0: 
cannam@0:     // No. of constant Q bins
cannam@0:     m_uK = ( unsigned int ) ceil( m_BPO * log(m_FMax/m_FMin)/log(2.0));	
cannam@0: 
cannam@0:     // Create array for chroma result
cannam@0:     m_chromadata = new double[ m_BPO ];
cannam@0: 
cannam@0:     // Initialise FFT object	
cannam@0:     m_FFT = new FFT;
cannam@0: 
cannam@0:     // Create Config Structure for ConstantQ operator
cannam@0:     CQConfig ConstantQConfig;
cannam@0: 
cannam@0:     // Populate CQ config structure with parameters
cannam@0:     // inherited from the Chroma config
cannam@0:     ConstantQConfig.FS	 = Config.FS;
cannam@0:     ConstantQConfig.min = m_FMin;
cannam@0:     ConstantQConfig.max = m_FMax;
cannam@0:     ConstantQConfig.BPO = m_BPO;
cannam@0:     ConstantQConfig.CQThresh = Config.CQThresh;
cannam@0: 	
cannam@0:     // Initialise ConstantQ operator
cannam@0:     m_ConstantQ = new ConstantQ( ConstantQConfig );
cannam@0: 
cannam@0:     // Initialise working arrays
cannam@0:     m_frameSize = m_ConstantQ->getfftlength();
cannam@0:     m_hopSize = m_ConstantQ->gethop();
cannam@0: 
cannam@0:     m_FFTRe = new double[ m_frameSize ];
cannam@0:     m_FFTIm = new double[ m_frameSize ];
cannam@0:     m_CQRe  = new double[ m_uK ];
cannam@0:     m_CQIm  = new double[ m_uK ];
cannam@0: 
cannam@0:     // Generate CQ Kernel 
cannam@0:     m_ConstantQ->sparsekernel();
cannam@0:     return 1;
cannam@0: }
cannam@0: 
cannam@0: Chromagram::~Chromagram()
cannam@0: {
cannam@0:     deInitialise();
cannam@0: }
cannam@0: 
cannam@0: int Chromagram::deInitialise()
cannam@0: {
cannam@0:     delete [] m_chromadata;
cannam@0: 
cannam@0:     delete m_FFT;
cannam@0: 
cannam@0:     delete m_ConstantQ;
cannam@0: 
cannam@0:     delete [] m_FFTRe;
cannam@0:     delete [] m_FFTIm;
cannam@0:     delete [] m_CQRe;
cannam@0:     delete [] m_CQIm;
cannam@0:     return 1;
cannam@0: }
cannam@0: 
cannam@0: //----------------------------------------------------------------------------------
cannam@0: // returns the absolute value of complex number xx + i*yy
cannam@0: double Chromagram::kabs(double xx, double yy)
cannam@0: {
cannam@0:     double ab = sqrt(xx*xx + yy*yy);
cannam@0:     return(ab);
cannam@0: }
cannam@0: //-----------------------------------------------------------------------------------
cannam@0: 
cannam@0: 
cannam@0: void Chromagram::unityNormalise(double *src)
cannam@0: {
cannam@0:     double min, max;
cannam@0: 
cannam@0:     double val = 0;
cannam@0: 
cannam@0:     MathUtilities::getFrameMinMax( src, m_BPO, & min, &max );
cannam@0: 
cannam@0:     for( unsigned int i = 0; i < m_BPO; i++ )
cannam@0:     {
cannam@0: 	val = src[ i ] / max;
cannam@0: 
cannam@0: 	src[ i ] = val;
cannam@0:     }
cannam@0: }
cannam@0: 
cannam@0: 
cannam@0: double* Chromagram::process( double *data )
cannam@0: {
cannam@0:     //initialise chromadata to 0
cannam@0:     for (unsigned i=0; i<m_BPO; i++) 
cannam@0: 	m_chromadata[i]=0;
cannam@0: 
cannam@0:     double cmax = 0.0;
cannam@0:     double cval = 0;
cannam@0: 
cannam@0:     // FFT of current frame
cannam@0:     m_FFT->process( m_frameSize, 0, data, NULL, m_FFTRe, m_FFTIm ); 
cannam@0: 
cannam@0:     // Calculate ConstantQ frame
cannam@0:     m_ConstantQ->process( m_FFTRe, m_FFTIm, m_CQRe, m_CQIm );
cannam@0: 	
cannam@0:     // add each octave of cq data into Chromagram
cannam@0:     const unsigned octaves = (int)floor(double( m_uK/m_BPO))-1;
cannam@0:     for (unsigned octave=0; octave<=octaves; octave++) 
cannam@0:     {
cannam@0: 	unsigned firstBin = octave*m_BPO;
cannam@0: 	for (unsigned i=0; i<m_BPO; i++) 
cannam@0: 	{
cannam@0: 	    m_chromadata[i] += kabs( m_CQRe[ firstBin + i ], m_CQIm[ firstBin + i ]);
cannam@0: 	}
cannam@0:     }
cannam@0: 
cannam@0:     if( isNormalised )
cannam@0: 	unityNormalise( m_chromadata );
cannam@0: 
cannam@0:     return m_chromadata;
cannam@0: }
cannam@0: 
cannam@0: