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livetrax/libs/qm-dsp/dsp/keydetection/GetKeyMode.cpp
Paul Davis 3deba1921b add queen mary DSP library
git-svn-id: svn://localhost/ardour2/branches/3.0@9029 d708f5d6-7413-0410-9779-e7cbd77b26cf
2011-03-02 12:37:39 +00:00

319 lines
9.1 KiB
C++

/* -*- 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);
}