/[svn]/linuxsampler/trunk/src/common/RTMath.h
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revision 829 by schoenebeck, Sat Jan 14 14:07:47 2006 UTC revision 1862 by persson, Wed Mar 11 19:03:37 2009 UTC
# Line 3  Line 3 
3   *   LinuxSampler - modular, streaming capable sampler                     *   *   LinuxSampler - modular, streaming capable sampler                     *
4   *                                                                         *   *                                                                         *
5   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
6   *   Copyright (C) 2005, 2006 Christian Schoenebeck                        *   *   Copyright (C) 2005 - 2007 Christian Schoenebeck                       *
7   *                                                                         *   *                                                                         *
8   *   This program is free software; you can redistribute it and/or modify  *   *   This program is free software; you can redistribute it and/or modify  *
9   *   it under the terms of the GNU General Public License as published by  *   *   it under the terms of the GNU General Public License as published by  *
# Line 26  Line 26 
26    
27  #include <math.h>  #include <math.h>
28  #include <stdint.h>  #include <stdint.h>
29  #include "global.h"  #include "global_private.h"
30    
31  /// Needed for calculating frequency ratio used to pitch a sample  /// Needed for calculating frequency ratio used to pitch a sample
32  #define TWELVEHUNDREDTH_ROOT_OF_TWO     1.000577789506555  #define TWELVEHUNDREDTH_ROOT_OF_TWO     1.000577789506555
# Line 76  class RTMathBase { Line 76  class RTMathBase {
76          }          }
77    
78          /**          /**
79             * Slower version of CentsToFreqRatio, for big values.
80             *
81             * @param cents - pitch value in cents (+1200 cents means +1 octave)
82             * @returns  frequency ratio (e.g. +2.0 for +1 octave)
83             */
84            static double CentsToFreqRatioUnlimited(double Cents) {
85                int octaves = int(Cents / 1200);
86                double x = CentsToFreqRatio(Cents - octaves * 1200);
87                return  octaves < 0 ? x / (1 << -octaves) : x * (1 << octaves);
88            }
89    
90            /**
91           * Inverse function to CentsToFreqRatio(). This function is a bit           * Inverse function to CentsToFreqRatio(). This function is a bit
92           * slow, so it should not be called too frequently.           * slow, so it should not be called too frequently.
93           */           */
# Line 84  class RTMathBase { Line 96  class RTMathBase {
96          }          }
97    
98      private:      private:
         static float  CentsToFreqTable[CONFIG_MAX_PITCH * 1200 * 2 + 1];  
99          static float* pCentsToFreqTable;          static float* pCentsToFreqTable;
100    
101          static float* InitCentsToFreqTable();          static float* InitCentsToFreqTable();
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