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diff --git a/interpretor/lib/src/libsndfile-1.0.25/tests/dft_cmp.c b/interpretor/lib/src/libsndfile-1.0.25/tests/dft_cmp.c
deleted file mode 100644
index c902769..0000000
--- a/interpretor/lib/src/libsndfile-1.0.25/tests/dft_cmp.c
+++ /dev/null
@@ -1,149 +0,0 @@
-/*
-** 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 */