1 files changed, 62 insertions, 0 deletions
diff --git a/libs/qm-dsp/dsp/rateconversion/Decimator.h b/libs/qm-dsp/dsp/rateconversion/Decimator.h
new file mode 100644
index 0000000000..081c267e20
--- /dev/null
+++ b/libs/qm-dsp/dsp/rateconversion/Decimator.h
@@ -0,0 +1,62 @@
+/* -*- 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 DECIMATOR_H
+#define DECIMATOR_H
+
+class Decimator  
+{
+public:
+    void process( const double* src, double* dst );
+    void process( const float* src, float* dst );
+
+    /**
+     * Construct a Decimator to operate on input blocks of length
+     * inLength, with decimation factor decFactor.  inLength should be
+     * a multiple of decFactor.  Output blocks will be of length
+     * inLength / decFactor.
+     *
+     * decFactor must be a power of two.  The highest supported factor
+     * is obtained through getHighestSupportedFactor(); for higher
+     * factors, you will need to chain more than one decimator.
+     */
+    Decimator( unsigned int inLength, unsigned int decFactor );
+    virtual ~Decimator();
+
+    int getFactor() const { return m_decFactor; }
+    static int getHighestSupportedFactor() { return 8; }
+
+private:
+    void resetFilter();
+    void deInitialise();
+    void initialise( unsigned int inLength, unsigned int decFactor );
+    void doAntiAlias( const double* src, double* dst, unsigned int length );
+    void doAntiAlias( const float* src, double* dst, unsigned int length );
+
+    unsigned int m_inputLength;
+    unsigned int m_outputLength;
+    unsigned int m_decFactor;
+
+    double Input;
+    double Output ;
+
+    double o1,o2,o3,o4,o5,o6,o7;
+
+    double a[ 9 ];
+    double b[ 9 ];
+	
+    double* decBuffer;
+};
+
+#endif //