annotate maths/MathAliases.h @ 298:255e431ae3d4

* Key detector: when returning key strengths, use the peak value of the
  three underlying chromagram correlations (from 36-bin chromagram)
  corresponding to each key, instead of the mean.
  Rationale: This is the same method as used when returning the key value,
  and it's nice to have the same results in both returned value and plot.
  The peak performed better than the sum with a simple test set of triads,
  so it seems reasonable to change the plot to match the key output rather
  than the other way around.

* FFT: kiss_fftr returns only the non-conjugate bins, synthesise the rest
  rather than leaving them (perhaps dangerously) undefined.  Fixes an
  uninitialised data error in chromagram that could cause garbage results
  from key detector.

* Constant Q: remove precalculated values again, I reckon they're not
  proving such a good tradeoff.

/* -*- 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 copyright 2005-2006 Christian Landone.
    All rights reserved.
*/

#ifndef MATHALIASES_H
#define MATHALIASES_H

#include <cmath>
#include <complex>

using namespace std;
typedef complex<double> ComplexData;


#ifndef PI
#define PI (3.14159265358979232846)
#endif

#define TWO_PI 		(2. * PI)

#define EPS 2.2204e-016

/* aliases to math.h functions */
#define EXP				exp
#define COS				cos
#define SIN				sin
#define ABS				fabs
#define POW				powf
#define SQRT			sqrtf
#define LOG10			log10f
#define LOG				logf
#define FLOOR			floorf
#define TRUNC			truncf

/* aliases to complex.h functions */
/** sample = EXPC(complex) */
#define EXPC			cexpf
/** complex = CEXPC(complex) */
#define CEXPC			cexp
/** sample = ARGC(complex) */
#define ARGC			cargf
/** sample = ABSC(complex) norm */
#define ABSC			cabsf
/** sample = REAL(complex) */
#define REAL			crealf
/** sample = IMAG(complex) */
#define IMAG			cimagf

#endif