Paul Davis
3deba1921b
git-svn-id: svn://localhost/ardour2/branches/3.0@9029 d708f5d6-7413-0410-9779-e7cbd77b26cf
88 lines
2.1 KiB
C++
88 lines
2.1 KiB
C++
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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/*
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QM DSP Library
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Centre for Digital Music, Queen Mary, University of London.
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This file 2005-2006 Christian Landone.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. See the file
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COPYING included with this distribution for more information.
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*/
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#include "Filter.h"
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//////////////////////////////////////////////////////////////////////
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// Construction/Destruction
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//////////////////////////////////////////////////////////////////////
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Filter::Filter( FilterConfig Config )
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{
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m_ord = 0;
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m_outBuffer = NULL;
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m_inBuffer = NULL;
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initialise( Config );
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}
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Filter::~Filter()
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{
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deInitialise();
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}
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void Filter::initialise( FilterConfig Config )
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{
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m_ord = Config.ord;
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m_ACoeffs = Config.ACoeffs;
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m_BCoeffs = Config.BCoeffs;
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m_inBuffer = new double[ m_ord + 1 ];
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m_outBuffer = new double[ m_ord + 1 ];
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reset();
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}
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void Filter::deInitialise()
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{
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delete[] m_inBuffer;
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delete[] m_outBuffer;
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}
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void Filter::reset()
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{
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for( unsigned int i = 0; i < m_ord+1; i++ ){ m_inBuffer[ i ] = 0.0; }
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for(unsigned int i = 0; i < m_ord+1; i++ ){ m_outBuffer[ i ] = 0.0; }
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}
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void Filter::process( double *src, double *dst, unsigned int length )
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{
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unsigned int SP,i,j;
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double xin,xout;
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for (SP=0;SP<length;SP++)
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{
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xin=src[SP];
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/* move buffer */
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for ( i = 0; i < m_ord; i++) {m_inBuffer[ m_ord - i ]=m_inBuffer[ m_ord - i - 1 ];}
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m_inBuffer[0]=xin;
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xout=0.0;
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for (j=0;j< m_ord + 1; j++)
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xout = xout + m_BCoeffs[ j ] * m_inBuffer[ j ];
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for (j = 0; j < m_ord; j++)
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xout= xout - m_ACoeffs[ j + 1 ] * m_outBuffer[ j ];
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dst[ SP ] = xout;
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for ( i = 0; i < m_ord - 1; i++ ) { m_outBuffer[ m_ord - i - 1 ] = m_outBuffer[ m_ord - i - 2 ];}
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m_outBuffer[0]=xout;
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} /* end of SP loop */
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}
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