+++ /dev/null
-/*
-** Copyright (C) 2002-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
-**
-** 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.
-**
-** This program is distributed in the hope that it will be useful,
-** but WITHOUT ANY WARRANTY; without even the implied warranty of
-** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-** GNU General Public License for more details.
-**
-** You should have received a copy of the GNU General Public License
-** along with this program; if not, write to the Free Software
-** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-*/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-
-#include "dft_cmp.h"
-#include "utils.h"
-
-#ifndef M_PI
-#define M_PI 3.14159265358979323846264338
-#endif
-
-#define DFT_SPEC_LENGTH (DFT_DATA_LENGTH / 2)
-
-static void dft_magnitude (const double *data, double *spectrum) ;
-static double calc_max_spectral_difference (const double *spec1, const double *spec2) ;
-
-/*--------------------------------------------------------------------------------
-** Public functions.
-*/
-
-double
-dft_cmp_float (int linenum, const float *in_data, const float *test_data, int len, double target_snr, int allow_exit)
-{ static double orig [DFT_DATA_LENGTH] ;
- static double test [DFT_DATA_LENGTH] ;
- unsigned k ;
-
- if (len != DFT_DATA_LENGTH)
- { printf ("Error (line %d) : dft_cmp_float : Bad input array length.\n", linenum) ;
- return 1 ;
- } ;
-
- for (k = 0 ; k < ARRAY_LEN (orig) ; k++)
- { test [k] = test_data [k] ;
- orig [k] = in_data [k] ;
- } ;
-
- return dft_cmp_double (linenum, orig, test, len, target_snr, allow_exit) ;
-} /* dft_cmp_float */
-
-double
-dft_cmp_double (int linenum, const double *orig, const double *test, int len, double target_snr, int allow_exit)
-{ static double orig_spec [DFT_SPEC_LENGTH] ;
- static double test_spec [DFT_SPEC_LENGTH] ;
- double snr ;
-
- if (! orig || ! test)
- { printf ("Error (line %d) : dft_cmp_double : Bad input arrays.\n", linenum) ;
- return 1 ;
- } ;
-
- if (len != DFT_DATA_LENGTH)
- { printf ("Error (line %d) : dft_cmp_double : Bad input array length.\n", linenum) ;
- return 1 ;
- } ;
-
- dft_magnitude (orig, orig_spec) ;
- dft_magnitude (test, test_spec) ;
-
- snr = calc_max_spectral_difference (orig_spec, test_spec) ;
-
- if (snr > target_snr)
- { printf ("\n\nLine %d: Actual SNR (% 4.1f) > target SNR (% 4.1f).\n\n", linenum, snr, target_snr) ;
- oct_save_double (orig, test, len) ;
- if (allow_exit)
- exit (1) ;
- } ;
-
- if (snr < -500.0)
- snr = -500.0 ;
-
- return snr ;
-} /* dft_cmp_double */
-
-/*--------------------------------------------------------------------------------
-** Quick dirty calculation of magnitude spectrum for real valued data using
-** Discrete Fourier Transform. Since the data is real, the DFT is only
-** calculated for positive frequencies.
-*/
-
-static void
-dft_magnitude (const double *data, double *spectrum)
-{ static double cos_angle [DFT_DATA_LENGTH] = { 0.0 } ;
- static double sin_angle [DFT_DATA_LENGTH] ;
-
- double real_part, imag_part ;
- int k, n ;
-
- /* If sine and cosine tables haven't been initialised, do so. */
- if (cos_angle [0] == 0.0)
- for (n = 0 ; n < DFT_DATA_LENGTH ; n++)
- { cos_angle [n] = cos (2.0 * M_PI * n / DFT_DATA_LENGTH) ;
- sin_angle [n] = -1.0 * sin (2.0 * M_PI * n / DFT_DATA_LENGTH) ;
- } ;
-
- /* DFT proper. Since the data is real, only generate a half spectrum. */
- for (k = 1 ; k < DFT_SPEC_LENGTH ; k++)
- { real_part = 0.0 ;
- imag_part = 0.0 ;
-
- for (n = 0 ; n < DFT_DATA_LENGTH ; n++)
- { real_part += data [n] * cos_angle [(k * n) % DFT_DATA_LENGTH] ;
- imag_part += data [n] * sin_angle [(k * n) % DFT_DATA_LENGTH] ;
- } ;
-
- spectrum [k] = sqrt (real_part * real_part + imag_part * imag_part) ;
- } ;
-
- spectrum [k] = 0.0 ;
-
- spectrum [0] = spectrum [1] = spectrum [2] = spectrum [3] = spectrum [4] = 0.0 ;
-
- return ;
-} /* dft_magnitude */
-
-static double
-calc_max_spectral_difference (const double *orig, const double *test)
-{ double orig_max = 0.0, max_diff = 0.0 ;
- int k ;
-
- for (k = 0 ; k < DFT_SPEC_LENGTH ; k++)
- { if (orig_max < orig [k])
- orig_max = orig [k] ;
- if (max_diff < fabs (orig [k] - test [k]))
- max_diff = fabs (orig [k] - test [k]) ;
- } ;
-
- if (max_diff < 1e-25)
- return -500.0 ;
-
- return 20.0 * log10 (max_diff / orig_max) ;
-} /* calc_max_spectral_difference */
projects / Faustine.git / blobdiff