319 lines
9.1 KiB
C++
319 lines
9.1 KiB
C++
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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// GetKeyMode.cpp: implementation of the CGetKeyMode class.
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//
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//////////////////////////////////////////////////////////////////////
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#include "GetKeyMode.h"
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#include "maths/MathUtilities.h"
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#include "base/Pitch.h"
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#include <iostream>
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#include <cstring>
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#include <cstdlib>
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// Chords profile
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static double MajProfile[36] =
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{ 0.0384, 0.0629, 0.0258, 0.0121, 0.0146, 0.0106, 0.0364, 0.0610, 0.0267,
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0.0126, 0.0121, 0.0086, 0.0364, 0.0623, 0.0279, 0.0275, 0.0414, 0.0186,
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0.0173, 0.0248, 0.0145, 0.0364, 0.0631, 0.0262, 0.0129, 0.0150, 0.0098,
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0.0312, 0.0521, 0.0235, 0.0129, 0.0142, 0.0095, 0.0289, 0.0478, 0.0239};
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static double MinProfile[36] =
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{ 0.0375, 0.0682, 0.0299, 0.0119, 0.0138, 0.0093, 0.0296, 0.0543, 0.0257,
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0.0292, 0.0519, 0.0246, 0.0159, 0.0234, 0.0135, 0.0291, 0.0544, 0.0248,
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0.0137, 0.0176, 0.0104, 0.0352, 0.0670, 0.0302, 0.0222, 0.0349, 0.0164,
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0.0174, 0.0297, 0.0166, 0.0222, 0.0401, 0.0202, 0.0175, 0.0270, 0.0146};
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//
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//////////////////////////////////////////////////////////////////////
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// Construction/Destruction
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//////////////////////////////////////////////////////////////////////
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GetKeyMode::GetKeyMode( int sampleRate, float tuningFrequency,
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double hpcpAverage, double medianAverage ) :
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m_hpcpAverage( hpcpAverage ),
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m_medianAverage( medianAverage ),
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m_ChrPointer(0),
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m_DecimatedBuffer(0),
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m_ChromaBuffer(0),
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m_MeanHPCP(0),
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m_MajCorr(0),
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m_MinCorr(0),
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m_Keys(0),
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m_MedianFilterBuffer(0),
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m_SortedBuffer(0),
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m_keyStrengths(0)
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{
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m_DecimationFactor = 8;
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// Chromagram configuration parameters
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m_ChromaConfig.normalise = MathUtilities::NormaliseUnitMax;
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m_ChromaConfig.FS = lrint(sampleRate/(double)m_DecimationFactor);
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if (m_ChromaConfig.FS < 1) m_ChromaConfig.FS = 1;
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// Set C (= MIDI #12) as our base :
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// This implies that key = 1 => Cmaj, key = 12 => Bmaj, key = 13 => Cmin, etc.
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m_ChromaConfig.min = Pitch::getFrequencyForPitch
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(48, 0, tuningFrequency);
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m_ChromaConfig.max = Pitch::getFrequencyForPitch
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(96, 0, tuningFrequency);
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m_ChromaConfig.BPO = 36;
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m_ChromaConfig.CQThresh = 0.0054;
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// Chromagram inst.
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m_Chroma = new Chromagram( m_ChromaConfig );
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// Get calculated parameters from chroma object
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m_ChromaFrameSize = m_Chroma->getFrameSize();
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// override hopsize for this application
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m_ChromaHopSize = m_ChromaFrameSize;
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m_BPO = m_ChromaConfig.BPO;
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// std::cerr << "chroma frame size = " << m_ChromaFrameSize << ", decimation factor = " << m_DecimationFactor << " therefore block size = " << getBlockSize() << std::endl;
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// Chromagram average and estimated key median filter lengths
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m_ChromaBuffersize = (int)ceil( m_hpcpAverage * m_ChromaConfig.FS/m_ChromaFrameSize );
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m_MedianWinsize = (int)ceil( m_medianAverage * m_ChromaConfig.FS/m_ChromaFrameSize );
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// Reset counters
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m_bufferindex = 0;
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m_ChromaBufferFilling = 0;
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m_MedianBufferFilling = 0;
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// Spawn objectc/arrays
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m_DecimatedBuffer = new double[m_ChromaFrameSize];
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m_ChromaBuffer = new double[m_BPO * m_ChromaBuffersize];
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memset( m_ChromaBuffer, 0, sizeof(double) * m_BPO * m_ChromaBuffersize);
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m_MeanHPCP = new double[m_BPO];
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m_MajCorr = new double[m_BPO];
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m_MinCorr = new double[m_BPO];
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m_Keys = new double[2*m_BPO];
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m_MedianFilterBuffer = new int[ m_MedianWinsize ];
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memset( m_MedianFilterBuffer, 0, sizeof(int)*m_MedianWinsize);
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m_SortedBuffer = new int[ m_MedianWinsize ];
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memset( m_SortedBuffer, 0, sizeof(int)*m_MedianWinsize);
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m_Decimator = new Decimator
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( m_ChromaFrameSize*m_DecimationFactor, m_DecimationFactor );
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m_keyStrengths = new double[24];
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}
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GetKeyMode::~GetKeyMode()
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{
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delete m_Chroma;
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delete m_Decimator;
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delete [] m_DecimatedBuffer;
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delete [] m_ChromaBuffer;
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delete [] m_MeanHPCP;
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delete [] m_MajCorr;
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delete [] m_MinCorr;
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delete [] m_Keys;
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delete [] m_MedianFilterBuffer;
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delete [] m_SortedBuffer;
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delete[] m_keyStrengths;
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}
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double GetKeyMode::krumCorr(double *pData1, double *pData2, unsigned int length)
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{
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double retVal= 0.0;
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double num = 0;
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double den = 0;
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double mX = MathUtilities::mean( pData1, length );
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double mY = MathUtilities::mean( pData2, length );
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double sum1 = 0;
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double sum2 = 0;
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for( unsigned int i = 0; i <length; i++ )
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{
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num += ( pData1[i] - mX ) * ( pData2[i] - mY );
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sum1 += ( (pData1[i]-mX) * (pData1[i]-mX) );
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sum2 += ( (pData2[i]-mY) * (pData2[i]-mY) );
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}
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den = sqrt(sum1 * sum2);
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if( den>0 )
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retVal = num/den;
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else
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retVal = 0;
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return retVal;
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}
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int GetKeyMode::process(double *PCMData)
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{
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int key;
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unsigned int j,k;
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//////////////////////////////////////////////
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m_Decimator->process( PCMData, m_DecimatedBuffer);
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m_ChrPointer = m_Chroma->process( m_DecimatedBuffer );
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// Move bins such that the centre of the base note is in the
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// middle of its three bins :
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// Added 21.11.07 by Chris Sutton based on debugging with Katy
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// Noland + comparison with Matlab equivalent.
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MathUtilities::circShift( m_ChrPointer, m_BPO, 1);
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/*
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std::cout << "raw chroma: ";
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for (int ii = 0; ii < m_BPO; ++ii) {
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if (ii % (m_BPO/12) == 0) std::cout << "\n";
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std::cout << m_ChrPointer[ii] << " ";
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}
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std::cout << std::endl;
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*/
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// populate hpcp values;
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int cbidx;
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for( j = 0; j < m_BPO; j++ )
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{
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cbidx = (m_bufferindex * m_BPO) + j;
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m_ChromaBuffer[ cbidx ] = m_ChrPointer[j];
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}
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//keep track of input buffers;
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if( m_bufferindex++ >= m_ChromaBuffersize - 1)
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m_bufferindex = 0;
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// track filling of chroma matrix
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if( m_ChromaBufferFilling++ >= m_ChromaBuffersize)
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m_ChromaBufferFilling = m_ChromaBuffersize;
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//calculate mean
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for( k = 0; k < m_BPO; k++ )
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{
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double mnVal = 0.0;
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for( j = 0; j < m_ChromaBufferFilling; j++ )
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{
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mnVal += m_ChromaBuffer[ k + (j*m_BPO) ];
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}
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m_MeanHPCP[k] = mnVal/(double)m_ChromaBufferFilling;
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}
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for( k = 0; k < m_BPO; k++ )
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{
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m_MajCorr[k] = krumCorr( m_MeanHPCP, MajProfile, m_BPO );
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m_MinCorr[k] = krumCorr( m_MeanHPCP, MinProfile, m_BPO );
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MathUtilities::circShift( MajProfile, m_BPO, 1 );
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MathUtilities::circShift( MinProfile, m_BPO, 1 );
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}
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for( k = 0; k < m_BPO; k++ )
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{
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m_Keys[k] = m_MajCorr[k];
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m_Keys[k+m_BPO] = m_MinCorr[k];
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}
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for (k = 0; k < 24; ++k) {
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m_keyStrengths[k] = 0;
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}
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for( k = 0; k < m_BPO*2; k++ )
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{
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int idx = k / (m_BPO/12);
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int rem = k % (m_BPO/12);
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if (rem == 0 || m_Keys[k] > m_keyStrengths[idx]) {
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m_keyStrengths[idx] = m_Keys[k];
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}
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// m_keyStrengths[k/(m_BPO/12)] += m_Keys[k];
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}
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/*
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std::cout << "raw keys: ";
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for (int ii = 0; ii < 2*m_BPO; ++ii) {
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if (ii % (m_BPO/12) == 0) std::cout << "\n";
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std::cout << m_Keys[ii] << " ";
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}
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std::cout << std::endl;
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std::cout << "key strengths: ";
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for (int ii = 0; ii < 24; ++ii) {
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if (ii % 6 == 0) std::cout << "\n";
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std::cout << m_keyStrengths[ii] << " ";
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}
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std::cout << std::endl;
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*/
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double dummy;
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// '1 +' because we number keys 1-24, not 0-23.
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key = 1 + (int)ceil( (double)MathUtilities::getMax( m_Keys, 2* m_BPO, &dummy )/3 );
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// std::cout << "key pre-sorting: " << key << std::endl;
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//Median filtering
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// track Median buffer initial filling
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if( m_MedianBufferFilling++ >= m_MedianWinsize)
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m_MedianBufferFilling = m_MedianWinsize;
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//shift median buffer
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for( k = 1; k < m_MedianWinsize; k++ )
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{
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m_MedianFilterBuffer[ k - 1 ] = m_MedianFilterBuffer[ k ];
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}
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//write new key value into median buffer
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m_MedianFilterBuffer[ m_MedianWinsize - 1 ] = key;
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//Copy median into sorting buffer, reversed
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unsigned int ijx = 0;
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for( k = 0; k < m_MedianWinsize; k++ )
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{
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m_SortedBuffer[k] = m_MedianFilterBuffer[m_MedianWinsize-1-ijx];
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ijx++;
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}
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qsort(m_SortedBuffer, m_MedianBufferFilling, sizeof(unsigned int),
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MathUtilities::compareInt);
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/*
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std::cout << "sorted: ";
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for (int ii = 0; ii < m_MedianBufferFilling; ++ii) {
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std::cout << m_SortedBuffer[ii] << " ";
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}
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std::cout << std::endl;
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*/
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int sortlength = m_MedianBufferFilling;
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int midpoint = (int)ceil((double)sortlength/2);
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// std::cout << "midpoint = " << midpoint << endl;
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if( midpoint <= 0 )
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midpoint = 1;
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key = m_SortedBuffer[midpoint-1];
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// std::cout << "returning key = " << key << endl;
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return key;
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}
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bool GetKeyMode::isModeMinor( int key )
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{
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return (key > 12);
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}
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