63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
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/* -*- 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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#ifndef DECIMATOR_H
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#define DECIMATOR_H
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class Decimator
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{
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public:
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void process( const double* src, double* dst );
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void process( const float* src, float* dst );
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/**
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* Construct a Decimator to operate on input blocks of length
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* inLength, with decimation factor decFactor. inLength should be
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* a multiple of decFactor. Output blocks will be of length
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* inLength / decFactor.
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*
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* decFactor must be a power of two. The highest supported factor
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* is obtained through getHighestSupportedFactor(); for higher
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* factors, you will need to chain more than one decimator.
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*/
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Decimator( unsigned int inLength, unsigned int decFactor );
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virtual ~Decimator();
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int getFactor() const { return m_decFactor; }
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static int getHighestSupportedFactor() { return 8; }
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private:
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void resetFilter();
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void deInitialise();
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void initialise( unsigned int inLength, unsigned int decFactor );
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void doAntiAlias( const double* src, double* dst, unsigned int length );
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void doAntiAlias( const float* src, double* dst, unsigned int length );
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unsigned int m_inputLength;
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unsigned int m_outputLength;
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unsigned int m_decFactor;
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double Input;
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double Output ;
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double o1,o2,o3,o4,o5,o6,o7;
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double a[ 9 ];
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double b[ 9 ];
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double* decBuffer;
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};
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#endif //
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