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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 "Filter.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
Filter::Filter( FilterConfig Config )
{
m_ord = 0;
m_outBuffer = NULL;
m_inBuffer = NULL;
initialise( Config );
}
Filter::~Filter()
{
deInitialise();
}
void Filter::initialise( FilterConfig Config )
{
m_ord = Config.ord;
m_ACoeffs = Config.ACoeffs;
m_BCoeffs = Config.BCoeffs;
m_inBuffer = new double[ m_ord + 1 ];
m_outBuffer = new double[ m_ord + 1 ];
reset();
}
void Filter::deInitialise()
{
delete[] m_inBuffer;
delete[] m_outBuffer;
}
void Filter::reset()
{
for( unsigned int i = 0; i < m_ord+1; i++ ){ m_inBuffer[ i ] = 0.0; }
for(unsigned int i = 0; i < m_ord+1; i++ ){ m_outBuffer[ i ] = 0.0; }
}
void Filter::process( double *src, double *dst, unsigned int length )
{
unsigned int SP,i,j;
double xin,xout;
for (SP=0;SP<length;SP++)
{
xin=src[SP];
/* move buffer */
for ( i = 0; i < m_ord; i++) {m_inBuffer[ m_ord - i ]=m_inBuffer[ m_ord - i - 1 ];}
m_inBuffer[0]=xin;
xout=0.0;
for (j=0;j< m_ord + 1; j++)
xout = xout + m_BCoeffs[ j ] * m_inBuffer[ j ];
for (j = 0; j < m_ord; j++)
xout= xout - m_ACoeffs[ j + 1 ] * m_outBuffer[ j ];
dst[ SP ] = xout;
for ( i = 0; i < m_ord - 1; i++ ) { m_outBuffer[ m_ord - i - 1 ] = m_outBuffer[ m_ord - i - 2 ];}
m_outBuffer[0]=xout;
} /* end of SP loop */
}
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