cannam@0: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
cannam@0: 
cannam@0: /*
cannam@0:     QM DSP Library
cannam@0: 
cannam@0:     Centre for Digital Music, Queen Mary, University of London.
Chris@84:     This file 2005-2006 Christian Landone.
Chris@84: 
Chris@84:     This program is free software; you can redistribute it and/or
Chris@84:     modify it under the terms of the GNU General Public License as
Chris@84:     published by the Free Software Foundation; either version 2 of the
Chris@84:     License, or (at your option) any later version.  See the file
Chris@84:     COPYING included with this distribution for more information.
cannam@0: */
cannam@0: 
cannam@0: #ifndef FILTER_H
cannam@0: #define FILTER_H
cannam@0: 
cannam@0: #ifndef NULL
cannam@0: #define NULL 0
cannam@0: #endif
cannam@0: 
Chris@153: /**
Chris@153:  * Filter specification. For a filter of order ord, the ACoeffs and
Chris@153:  * BCoeffs arrays must point to ord+1 values each. ACoeffs provides
Chris@153:  * the denominator and BCoeffs the numerator coefficients of the
Chris@153:  * filter.
Chris@153:  */
cannam@0: struct FilterConfig{
cannam@0:     unsigned int ord;
cannam@0:     double* ACoeffs;
cannam@0:     double* BCoeffs;
cannam@0: };
cannam@0: 
Chris@153: /**
Chris@153:  * Digital filter specified through FilterConfig structure.
Chris@153:  */
cannam@0: class Filter  
cannam@0: {
cannam@0: public:
cannam@0:     Filter( FilterConfig Config );
cannam@0:     virtual ~Filter();
cannam@0: 
cannam@0:     void reset();
cannam@0: 
cannam@0:     void process( double *src, double *dst, unsigned int length );
cannam@0: 
cannam@0: private:
cannam@0:     void initialise( FilterConfig Config );
cannam@0:     void deInitialise();
cannam@0: 
cannam@0:     unsigned int m_ord;
cannam@0: 
cannam@0:     double* m_inBuffer;
cannam@0:     double* m_outBuffer;
cannam@0: 
cannam@0:     double* m_ACoeffs;
cannam@0:     double* m_BCoeffs;
cannam@0: };
cannam@0: 
cannam@0: #endif