add queen mary DSP library

git-svn-id: svn://localhost/ardour2/branches/3.0@9029 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/qm-dsp/dsp/signalconditioning/FiltFilt.h

@@ -0,0 +1,50 @@
+/* -*- 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.
+*/
+
+#ifndef FILTFILT_H
+#define FILTFILT_H
+
+#include "Filter.h"
+
+struct FiltFiltConfig{
+    unsigned int ord;
+    double* ACoeffs;
+    double* BCoeffs;
+};
+
+class FiltFilt  
+{
+public:
+    FiltFilt( FiltFiltConfig Config );
+    virtual ~FiltFilt();
+
+    void reset();
+    void process( double* src, double* dst, unsigned int length );
+
+private:
+    void initialise( FiltFiltConfig Config );
+    void deInitialise();
+
+    unsigned int m_ord;
+
+    Filter* m_filter;
+
+    double* m_filtScratchIn;
+    double* m_filtScratchOut;
+
+    FilterConfig m_filterConfig;
+};
+
+#endif