diff options
Diffstat (limited to 'libs/qm-dsp/dsp/keydetection/GetKeyMode.cpp')
| -rw-r--r-- | libs/qm-dsp/dsp/keydetection/GetKeyMode.cpp | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/libs/qm-dsp/dsp/keydetection/GetKeyMode.cpp b/libs/qm-dsp/dsp/keydetection/GetKeyMode.cpp new file mode 100644 index 0000000000..7939d2c31a --- /dev/null +++ b/libs/qm-dsp/dsp/keydetection/GetKeyMode.cpp @@ -0,0 +1,318 @@ +/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+// GetKeyMode.cpp: implementation of the CGetKeyMode class.
+//
+//////////////////////////////////////////////////////////////////////
+
+#include "GetKeyMode.h"
+#include "maths/MathUtilities.h"
+#include "base/Pitch.h"
+
+#include <iostream>
+
+#include <cstring>
+#include <cstdlib>
+
+// Chords profile
+static double MajProfile[36] =
+{ 0.0384, 0.0629, 0.0258, 0.0121, 0.0146, 0.0106, 0.0364, 0.0610, 0.0267,
+ 0.0126, 0.0121, 0.0086, 0.0364, 0.0623, 0.0279, 0.0275, 0.0414, 0.0186,
+ 0.0173, 0.0248, 0.0145, 0.0364, 0.0631, 0.0262, 0.0129, 0.0150, 0.0098,
+ 0.0312, 0.0521, 0.0235, 0.0129, 0.0142, 0.0095, 0.0289, 0.0478, 0.0239};
+
+static double MinProfile[36] =
+{ 0.0375, 0.0682, 0.0299, 0.0119, 0.0138, 0.0093, 0.0296, 0.0543, 0.0257,
+ 0.0292, 0.0519, 0.0246, 0.0159, 0.0234, 0.0135, 0.0291, 0.0544, 0.0248,
+ 0.0137, 0.0176, 0.0104, 0.0352, 0.0670, 0.0302, 0.0222, 0.0349, 0.0164,
+ 0.0174, 0.0297, 0.0166, 0.0222, 0.0401, 0.0202, 0.0175, 0.0270, 0.0146};
+//
+
+
+//////////////////////////////////////////////////////////////////////
+// Construction/Destruction
+//////////////////////////////////////////////////////////////////////
+
+GetKeyMode::GetKeyMode( int sampleRate, float tuningFrequency,
+ double hpcpAverage, double medianAverage ) :
+ m_hpcpAverage( hpcpAverage ),
+ m_medianAverage( medianAverage ),
+ m_ChrPointer(0),
+ m_DecimatedBuffer(0),
+ m_ChromaBuffer(0),
+ m_MeanHPCP(0),
+ m_MajCorr(0),
+ m_MinCorr(0),
+ m_Keys(0),
+ m_MedianFilterBuffer(0),
+ m_SortedBuffer(0),
+ m_keyStrengths(0)
+{
+ m_DecimationFactor = 8;
+
+ // Chromagram configuration parameters
+ m_ChromaConfig.normalise = MathUtilities::NormaliseUnitMax;
+ m_ChromaConfig.FS = lrint(sampleRate/(double)m_DecimationFactor);
+ if (m_ChromaConfig.FS < 1) m_ChromaConfig.FS = 1;
+
+ // Set C (= MIDI #12) as our base :
+ // This implies that key = 1 => Cmaj, key = 12 => Bmaj, key = 13 => Cmin, etc.
+ m_ChromaConfig.min = Pitch::getFrequencyForPitch
+ (48, 0, tuningFrequency);
+ m_ChromaConfig.max = Pitch::getFrequencyForPitch
+ (96, 0, tuningFrequency);
+
+ m_ChromaConfig.BPO = 36;
+ m_ChromaConfig.CQThresh = 0.0054;
+
+ // Chromagram inst.
+ m_Chroma = new Chromagram( m_ChromaConfig );
+
+ // Get calculated parameters from chroma object
+ m_ChromaFrameSize = m_Chroma->getFrameSize();
+ // override hopsize for this application
+ m_ChromaHopSize = m_ChromaFrameSize;
+ m_BPO = m_ChromaConfig.BPO;
+
+// std::cerr << "chroma frame size = " << m_ChromaFrameSize << ", decimation factor = " << m_DecimationFactor << " therefore block size = " << getBlockSize() << std::endl;
+
+ // Chromagram average and estimated key median filter lengths
+ m_ChromaBuffersize = (int)ceil( m_hpcpAverage * m_ChromaConfig.FS/m_ChromaFrameSize );
+ m_MedianWinsize = (int)ceil( m_medianAverage * m_ChromaConfig.FS/m_ChromaFrameSize );
+
+ // Reset counters
+ m_bufferindex = 0;
+ m_ChromaBufferFilling = 0;
+ m_MedianBufferFilling = 0;
+
+ // Spawn objectc/arrays
+ m_DecimatedBuffer = new double[m_ChromaFrameSize];
+
+ m_ChromaBuffer = new double[m_BPO * m_ChromaBuffersize];
+ memset( m_ChromaBuffer, 0, sizeof(double) * m_BPO * m_ChromaBuffersize);
+
+ m_MeanHPCP = new double[m_BPO];
+
+ m_MajCorr = new double[m_BPO];
+ m_MinCorr = new double[m_BPO];
+ m_Keys = new double[2*m_BPO];
+
+ m_MedianFilterBuffer = new int[ m_MedianWinsize ];
+ memset( m_MedianFilterBuffer, 0, sizeof(int)*m_MedianWinsize);
+
+ m_SortedBuffer = new int[ m_MedianWinsize ];
+ memset( m_SortedBuffer, 0, sizeof(int)*m_MedianWinsize);
+
+ m_Decimator = new Decimator
+ ( m_ChromaFrameSize*m_DecimationFactor, m_DecimationFactor );
+
+ m_keyStrengths = new double[24];
+}
+
+GetKeyMode::~GetKeyMode()
+{
+
+ delete m_Chroma;
+ delete m_Decimator;
+
+ delete [] m_DecimatedBuffer;
+ delete [] m_ChromaBuffer;
+ delete [] m_MeanHPCP;
+ delete [] m_MajCorr;
+ delete [] m_MinCorr;
+ delete [] m_Keys;
+ delete [] m_MedianFilterBuffer;
+ delete [] m_SortedBuffer;
+
+ delete[] m_keyStrengths;
+}
+
+double GetKeyMode::krumCorr(double *pData1, double *pData2, unsigned int length)
+{
+ double retVal= 0.0;
+
+ double num = 0;
+ double den = 0;
+ double mX = MathUtilities::mean( pData1, length );
+ double mY = MathUtilities::mean( pData2, length );
+
+ double sum1 = 0;
+ double sum2 = 0;
+
+ for( unsigned int i = 0; i <length; i++ )
+ {
+ num += ( pData1[i] - mX ) * ( pData2[i] - mY );
+
+ sum1 += ( (pData1[i]-mX) * (pData1[i]-mX) );
+ sum2 += ( (pData2[i]-mY) * (pData2[i]-mY) );
+ }
+
+ den = sqrt(sum1 * sum2);
+
+ if( den>0 )
+ retVal = num/den;
+ else
+ retVal = 0;
+
+
+ return retVal;
+}
+
+int GetKeyMode::process(double *PCMData)
+{
+ int key;
+
+ unsigned int j,k;
+
+ //////////////////////////////////////////////
+ m_Decimator->process( PCMData, m_DecimatedBuffer);
+
+ m_ChrPointer = m_Chroma->process( m_DecimatedBuffer );
+
+
+ // Move bins such that the centre of the base note is in the
+ // middle of its three bins :
+ // Added 21.11.07 by Chris Sutton based on debugging with Katy
+ // Noland + comparison with Matlab equivalent.
+ MathUtilities::circShift( m_ChrPointer, m_BPO, 1);
+/*
+ std::cout << "raw chroma: ";
+ for (int ii = 0; ii < m_BPO; ++ii) {
+ if (ii % (m_BPO/12) == 0) std::cout << "\n";
+ std::cout << m_ChrPointer[ii] << " ";
+ }
+ std::cout << std::endl;
+*/
+ // populate hpcp values;
+ int cbidx;
+ for( j = 0; j < m_BPO; j++ )
+ {
+ cbidx = (m_bufferindex * m_BPO) + j;
+ m_ChromaBuffer[ cbidx ] = m_ChrPointer[j];
+ }
+
+ //keep track of input buffers;
+ if( m_bufferindex++ >= m_ChromaBuffersize - 1)
+ m_bufferindex = 0;
+
+ // track filling of chroma matrix
+ if( m_ChromaBufferFilling++ >= m_ChromaBuffersize)
+ m_ChromaBufferFilling = m_ChromaBuffersize;
+
+ //calculate mean
+ for( k = 0; k < m_BPO; k++ )
+ {
+ double mnVal = 0.0;
+ for( j = 0; j < m_ChromaBufferFilling; j++ )
+ {
+ mnVal += m_ChromaBuffer[ k + (j*m_BPO) ];
+ }
+
+ m_MeanHPCP[k] = mnVal/(double)m_ChromaBufferFilling;
+ }
+
+
+ for( k = 0; k < m_BPO; k++ )
+ {
+ m_MajCorr[k] = krumCorr( m_MeanHPCP, MajProfile, m_BPO );
+ m_MinCorr[k] = krumCorr( m_MeanHPCP, MinProfile, m_BPO );
+
+ MathUtilities::circShift( MajProfile, m_BPO, 1 );
+ MathUtilities::circShift( MinProfile, m_BPO, 1 );
+ }
+
+ for( k = 0; k < m_BPO; k++ )
+ {
+ m_Keys[k] = m_MajCorr[k];
+ m_Keys[k+m_BPO] = m_MinCorr[k];
+ }
+
+ for (k = 0; k < 24; ++k) {
+ m_keyStrengths[k] = 0;
+ }
+
+ for( k = 0; k < m_BPO*2; k++ )
+ {
+ int idx = k / (m_BPO/12);
+ int rem = k % (m_BPO/12);
+ if (rem == 0 || m_Keys[k] > m_keyStrengths[idx]) {
+ m_keyStrengths[idx] = m_Keys[k];
+ }
+
+// m_keyStrengths[k/(m_BPO/12)] += m_Keys[k];
+ }
+
+/*
+ std::cout << "raw keys: ";
+ for (int ii = 0; ii < 2*m_BPO; ++ii) {
+ if (ii % (m_BPO/12) == 0) std::cout << "\n";
+ std::cout << m_Keys[ii] << " ";
+ }
+ std::cout << std::endl;
+
+ std::cout << "key strengths: ";
+ for (int ii = 0; ii < 24; ++ii) {
+ if (ii % 6 == 0) std::cout << "\n";
+ std::cout << m_keyStrengths[ii] << " ";
+ }
+ std::cout << std::endl;
+*/
+ double dummy;
+ // '1 +' because we number keys 1-24, not 0-23.
+ key = 1 + (int)ceil( (double)MathUtilities::getMax( m_Keys, 2* m_BPO, &dummy )/3 );
+
+// std::cout << "key pre-sorting: " << key << std::endl;
+
+
+ //Median filtering
+
+ // track Median buffer initial filling
+ if( m_MedianBufferFilling++ >= m_MedianWinsize)
+ m_MedianBufferFilling = m_MedianWinsize;
+
+ //shift median buffer
+ for( k = 1; k < m_MedianWinsize; k++ )
+ {
+ m_MedianFilterBuffer[ k - 1 ] = m_MedianFilterBuffer[ k ];
+ }
+
+ //write new key value into median buffer
+ m_MedianFilterBuffer[ m_MedianWinsize - 1 ] = key;
+
+
+ //Copy median into sorting buffer, reversed
+ unsigned int ijx = 0;
+ for( k = 0; k < m_MedianWinsize; k++ )
+ {
+ m_SortedBuffer[k] = m_MedianFilterBuffer[m_MedianWinsize-1-ijx];
+ ijx++;
+ }
+
+ qsort(m_SortedBuffer, m_MedianBufferFilling, sizeof(unsigned int),
+ MathUtilities::compareInt);
+/*
+ std::cout << "sorted: ";
+ for (int ii = 0; ii < m_MedianBufferFilling; ++ii) {
+ std::cout << m_SortedBuffer[ii] << " ";
+ }
+ std::cout << std::endl;
+*/
+ int sortlength = m_MedianBufferFilling;
+ int midpoint = (int)ceil((double)sortlength/2);
+
+// std::cout << "midpoint = " << midpoint << endl;
+
+ if( midpoint <= 0 )
+ midpoint = 1;
+
+ key = m_SortedBuffer[midpoint-1];
+
+// std::cout << "returning key = " << key << endl;
+
+ return key;
+}
+
+
+bool GetKeyMode::isModeMinor( int key )
+{
+ return (key > 12);
+}
|