1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
6 Centre for Digital Music, Queen Mary, University of London.
7 This file 2005-2006 Christian Landone.
9 This program is free software; you can redistribute it and/or
10 modify it under the terms of the GNU General Public License as
11 published by the Free Software Foundation; either version 2 of the
12 License, or (at your option) any later version. See the file
13 COPYING included with this distribution for more information.
16 #ifndef MATHUTILITIES_H
17 #define MATHUTILITIES_H
26 static double round( double x );
28 static void getFrameMinMax( const double* data, unsigned int len, double* min, double* max );
30 static double mean( const double* src, unsigned int len );
31 static double mean( const std::vector<double> &data,
32 unsigned int start, unsigned int count );
33 static double sum( const double* src, unsigned int len );
34 static double median( const double* src, unsigned int len );
36 static double princarg( double ang );
37 static double mod( double x, double y);
39 static void getAlphaNorm(const double *data, unsigned int len, unsigned int alpha, double* ANorm);
40 static double getAlphaNorm(const std::vector <double> &data, unsigned int alpha );
42 static void circShift( double* data, int length, int shift);
44 static int getMax( double* data, unsigned int length, double* max = 0 );
45 static int getMax( const std::vector<double> &data, double* max = 0 );
46 static int compareInt(const void * a, const void * b);
54 static void normalise(double *data, int length,
55 NormaliseType n = NormaliseUnitMax);
57 static void normalise(std::vector<double> &data,
58 NormaliseType n = NormaliseUnitMax);
60 // moving mean threshholding:
61 static void adaptiveThreshold(std::vector<double> &data);
63 static bool isPowerOfTwo(int x);
64 static int nextPowerOfTwo(int x); // e.g. 1300 -> 2048, 2048 -> 2048
65 static int previousPowerOfTwo(int x); // e.g. 1300 -> 1024, 2048 -> 2048
66 static int nearestPowerOfTwo(int x); // e.g. 1300 -> 1024, 1700 -> 2048