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add queen mary DSP library

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git-svn-id: svn://localhost/ardour2/branches/3.0@9029 d708f5d6-7413-0410-9779-e7cbd77b26cf
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Paul Davis 2011-03-02 12:37:39 +00:00
parent fa41cfef58
commit 3deba1921b
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libs/qm-dsp/dsp/signalconditioning/DFProcess.cpp Normal file
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/* -*- 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 2005-2006 Christian Landone.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#include "DFProcess.h"
#include "maths/MathUtilities.h"
#include <cstring>
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
DFProcess::DFProcess( DFProcConfig Config )
{
filtSrc = NULL;
filtDst = NULL;
m_filtScratchIn = NULL;
m_filtScratchOut = NULL;
m_FFOrd = 0;
initialise( Config );
}
DFProcess::~DFProcess()
{
deInitialise();
}
void DFProcess::initialise( DFProcConfig Config )
{
m_length = Config.length;
m_winPre = Config.winPre;
m_winPost = Config.winPost;
m_alphaNormParam = Config.AlphaNormParam;
m_isMedianPositive = Config.isMedianPositive;
filtSrc = new double[ m_length ];
filtDst = new double[ m_length ];
//Low Pass Smoothing Filter Config
m_FilterConfigParams.ord = Config.LPOrd;
m_FilterConfigParams.ACoeffs = Config.LPACoeffs;
m_FilterConfigParams.BCoeffs = Config.LPBCoeffs;
m_FiltFilt = new FiltFilt( m_FilterConfigParams );
}
void DFProcess::deInitialise()
{
delete [] filtSrc;
delete [] filtDst;
delete [] m_filtScratchIn;
delete [] m_filtScratchOut;
delete m_FiltFilt;
}
void DFProcess::process(double *src, double* dst)
{
if (m_length == 0) return;
removeDCNormalize( src, filtSrc );
m_FiltFilt->process( filtSrc, filtDst, m_length );
medianFilter( filtDst, dst );
}
void DFProcess::medianFilter(double *src, double *dst)
{
int i,k,j,l;
int index = 0;
double val = 0;
double* y = new double[ m_winPost + m_winPre + 1];
memset( y, 0, sizeof( double ) * ( m_winPost + m_winPre + 1) );
double* scratch = new double[ m_length ];
for( i = 0; i < m_winPre; i++)
{
if (index >= m_length) break;
k = i + m_winPost + 1;
for( j = 0; j < k; j++)
{
y[ j ] = src[ j ];
}
scratch[ index ] = MathUtilities::median( y, k );
index++;
}
for( i = 0; i + m_winPost + m_winPre < m_length; i ++)
{
if (index >= m_length) break;
l = 0;
for( j = i; j < ( i + m_winPost + m_winPre + 1); j++)
{
y[ l ] = src[ j ];
l++;
}
scratch[ index++ ] = MathUtilities::median( y, (m_winPost + m_winPre + 1 ));
}
for( i = std::max( m_length - m_winPost, 1); i < m_length; i++)
{
if (index >= m_length) break;
k = std::max( i - m_winPre, 1);
l = 0;
for( j = k; j < m_length; j++)
{
y[ l ] = src[ j ];
l++;
}
scratch[ index++ ] = MathUtilities::median( y, l);
}
for( i = 0; i < m_length; i++ )
{
val = src[ i ] - scratch[ i ];// - 0.033;
if( m_isMedianPositive )
{
if( val > 0 )
{
dst[ i ] = val;
}
else
{
dst[ i ] = 0;
}
}
else
{
dst[ i ] = val;
}
}
delete [] y;
delete [] scratch;
}
void DFProcess::removeDCNormalize( double *src, double*dst )
{
double DFmax = 0;
double DFMin = 0;
double DFAlphaNorm = 0;
MathUtilities::getFrameMinMax( src, m_length, &DFMin, &DFmax );
MathUtilities::getAlphaNorm( src, m_length, m_alphaNormParam, &DFAlphaNorm );
for( unsigned int i = 0; i< m_length; i++)
{
dst[ i ] = ( src[ i ] - DFMin ) / DFAlphaNorm;
}
}