[audio-libsamplerate.git] / libsamplerate / tests / snr_bw_test.c

/*
** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
** All rights reserved.
**
** This code is released under 2-clause BSD license. Please see the
** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
*/

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <time.h>

#if (HAVE_FFTW3)

#include <fftw3.h>

#include <samplerate.h>

#include "util.h"

#define	BUFFER_LEN		50000
#define	MAX_FREQS		4
#define	MAX_RATIOS		6
#define	MAX_SPEC_LEN	(1<<15)

#ifndef	M_PI
#define	M_PI			3.14159265358979323846264338
#endif

enum
{	BOOLEAN_FALSE	= 0,
	BOOLEAN_TRUE	= 1
} ;

typedef struct
{	int		freq_count ;
	double	freqs [MAX_FREQS] ;

	double	src_ratio ;
	int		pass_band_peaks ;

	double	snr ;
	double	peak_value ;
} SINGLE_TEST ;

typedef struct
{	int			converter ;
	int			tests ;
	int			do_bandwidth_test ;
	SINGLE_TEST	test_data [10] ;
} CONVERTER_TEST ;

static double snr_test (SINGLE_TEST *snr_test_data, int number, int converter, int verbose) ;
static double find_peak (float *output, int output_len) ;
static double bandwidth_test (int converter, int verbose) ;

int
main (int argc, char *argv [])
{	CONVERTER_TEST snr_test_data [] =
	{
		{	SRC_ZERO_ORDER_HOLD,
			8,
			BOOLEAN_FALSE,
			{	{	1,	{ 0.01111111111 },		3.0,		1,	 28.0,	1.0 },
				{	1,	{ 0.01111111111 },		0.6,		1,	 36.0,	1.0 },
				{	1,	{ 0.01111111111 },		0.3,		1,	 36.0,	1.0 },
				{	1,	{ 0.01111111111 },		1.0,		1,	150.0,	1.0 },
				{	1,	{ 0.01111111111 },		1.001,		1,	 38.0,	1.0 },
				{	2,	{ 0.011111, 0.324 },	1.9999,		2,	 14.0,	1.0 },
				{	2,	{ 0.012345, 0.457 },	0.456789,	1,	 12.0,	1.0 },
				{	1,	{ 0.3511111111 },		1.33,		1,	 10.0,	1.0 }
				}
			},

		{	SRC_LINEAR,
			8,
			BOOLEAN_FALSE,
			{	{	1,	{ 0.01111111111 },		3.0,		1,	 73.0,	1.0 },
				{	1,	{ 0.01111111111 },		0.6,		1,	 73.0,	1.0 },
				{	1,	{ 0.01111111111 },		0.3,		1,	 73.0,	1.0 },
				{	1,	{ 0.01111111111 },		1.0,		1,	150.0,	1.0 },
				{	1,	{ 0.01111111111 },		1.001,		1,	 77.0,	1.0 },
				{	2,	{ 0.011111, 0.324 },	1.9999,		2,	 15.0,	0.94 },
				{	2,	{ 0.012345, 0.457 },	0.456789,	1,	 25.0,	0.96 },
				{	1,	{ 0.3511111111 },		1.33,		1,	 22.0,	0.99 }
				}
			},

		{	SRC_SINC_FASTEST,
			9,
			BOOLEAN_TRUE,
			{	{	1,	{ 0.01111111111 },		3.0,		1,	100.0,	1.0 },
				{	1,	{ 0.01111111111 },		0.6,		1,	 99.0,	1.0 },
				{	1,	{ 0.01111111111 },		0.3,		1,	100.0,	1.0 },
				{	1,	{ 0.01111111111 },		1.0,		1,	150.0,	1.0 },
				{	1,	{ 0.01111111111 },		1.001,		1,	100.0,	1.0 },
				{	2,	{ 0.011111, 0.324 },	1.9999,		2,	 97.0,	1.0 },
				{	2,	{ 0.012345, 0.457 },	0.456789,	1,	100.0,	0.5 },
				{	2,	{ 0.011111, 0.45 },		0.6,		1,	 97.0,	0.5 },
				{	1,	{ 0.3511111111 },		1.33,		1,	 97.0,	1.0 }
				}
			},

		{	SRC_SINC_MEDIUM_QUALITY,
			9,
			BOOLEAN_TRUE,
			{	{	1,	{ 0.01111111111 },		3.0,		1,	145.0,	1.0 },
				{	1,	{ 0.01111111111 },		0.6,		1,	132.0,	1.0 },
				{	1,	{ 0.01111111111 },		0.3,		1,	138.0,	1.0 },
				{	1,	{ 0.01111111111 },		1.0,		1,	157.0,	1.0 },
				{	1,	{ 0.01111111111 },		1.001,		1,	148.0,	1.0 },
				{	2,	{ 0.011111, 0.324 },	1.9999,		2,	127.0,	1.0 },
				{	2,	{ 0.012345, 0.457 },	0.456789,	1,	123.0,	0.5 },
				{	2,	{ 0.011111, 0.45 },		0.6,		1,	126.0,	0.5 },
				{	1,	{ 0.43111111111 },		1.33,		1,	121.0,	1.0 }
				}
			},

		{	SRC_SINC_BEST_QUALITY,
			9,
			BOOLEAN_TRUE,
			{	{	1,	{ 0.01111111111 },		3.0,		1,	147.0,	1.0 },
				{	1,	{ 0.01111111111 },		0.6,		1,	147.0,	1.0 },
				{	1,	{ 0.01111111111 },		0.3,		1,	148.0,	1.0 },
				{	1,	{ 0.01111111111 },		1.0,		1,	155.0,	1.0 },
				{	1,	{ 0.01111111111 },		1.001,		1,	148.0,	1.0 },
				{	2,	{ 0.011111, 0.324 },	1.9999,		2,	146.0,	1.0 },
				{	2,	{ 0.012345, 0.457 },	0.456789,	1,	147.0,	0.5 },
				{	2,	{ 0.011111, 0.45 },		0.6,		1,	144.0,	0.5 },
				{	1,	{ 0.43111111111 },		1.33,		1,	145.0,	1.0 }
				}
			},
		} ; /* snr_test_data */

	double	best_snr, snr, freq3dB ;
	int 	j, k, converter, verbose = 0 ;

	if (argc == 2 && strcmp (argv [1], "--verbose") == 0)
		verbose = 1 ;

	puts ("") ;

	for (j = 0 ; j < ARRAY_LEN (snr_test_data) ; j++)
	{	best_snr = 5000.0 ;

		converter = snr_test_data [j].converter ;

		printf ("    Converter %d : %s\n", converter, src_get_name (converter)) ;
		printf ("    %s\n", src_get_description (converter)) ;

		for (k = 0 ; k < snr_test_data [j].tests ; k++)
		{	snr = snr_test (&(snr_test_data [j].test_data [k]), k, converter, verbose) ;
			if (best_snr > snr)
				best_snr = snr ;
			} ;

		printf ("    Worst case Signal-to-Noise Ratio : %.2f dB.\n", best_snr) ;

		if (snr_test_data [j].do_bandwidth_test == BOOLEAN_FALSE)
		{	puts ("    Bandwith test not performed on this converter.\n") ;
			continue ;
			}

		freq3dB = bandwidth_test (converter, verbose) ;

		printf ("    Measured -3dB rolloff point      : %5.2f %%.\n\n", freq3dB) ;
		} ;

	fftw_cleanup () ;

	return 0 ;
} /* main */

/*==============================================================================
*/

static double
snr_test (SINGLE_TEST *test_data, int number, int converter, int verbose)
{	static float data [BUFFER_LEN + 1] ;
	static float output [MAX_SPEC_LEN] ;

	SRC_STATE	*src_state ;
	SRC_DATA	src_data ;

	double		output_peak, snr ;
	int 		k, output_len, input_len, error ;

	if (verbose != 0)
	{	printf ("\tSignal-to-Noise Ratio Test %d.\n"
				"\t=====================================\n", number) ;
		printf ("\tFrequencies : [ ") ;
		for (k = 0 ; k < test_data->freq_count ; k++)
			printf ("%6.4f ", test_data->freqs [k]) ;

		printf ("]\n\tSRC Ratio   : %8.4f\n", test_data->src_ratio) ;
		}
	else
	{	printf ("\tSignal-to-Noise Ratio Test %d : ", number) ;
		fflush (stdout) ;
		} ;

	/* Set up the output array. */
	if (test_data->src_ratio >= 1.0)
	{	output_len = MAX_SPEC_LEN ;
		input_len = (int) ceil (MAX_SPEC_LEN / test_data->src_ratio) ;
		if (input_len > BUFFER_LEN)
			input_len = BUFFER_LEN ;
		}
	else
	{	input_len = BUFFER_LEN ;
		output_len = (int) ceil (BUFFER_LEN * test_data->src_ratio) ;
		output_len &= ((~0u) << 4) ;
		if (output_len > MAX_SPEC_LEN)
			output_len = MAX_SPEC_LEN ;
		input_len = (int) ceil (output_len / test_data->src_ratio) ;
		} ;

	memset (output, 0, sizeof (output)) ;

	/* Generate input data array. */
	gen_windowed_sines (test_data->freq_count, test_data->freqs, 1.0, data, input_len) ;

	/* Perform sample rate conversion. */
	if ((src_state = src_new (converter, 1, &error)) == NULL)
	{	printf ("\n\nLine %d : src_new() failed : %s.\n\n", __LINE__, src_strerror (error)) ;
		exit (1) ;
		} ;

	src_data.end_of_input = 1 ; /* Only one buffer worth of input. */

	src_data.data_in = data ;
	src_data.input_frames = input_len ;

	src_data.src_ratio = test_data->src_ratio ;

	src_data.data_out = output ;
	src_data.output_frames = output_len ;

	if ((error = src_process (src_state, &src_data)))
	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
		exit (1) ;
		} ;

	src_state = src_delete (src_state) ;

	if (verbose != 0)
		printf ("\tOutput Len  :   %ld\n", src_data.output_frames_gen) ;

	if (abs (src_data.output_frames_gen - output_len) > 4)
	{	printf ("\n\nLine %d : output data length should be %d.\n\n", __LINE__, output_len) ;
		exit (1) ;
		} ;

	/* Check output peak. */
	output_peak = find_peak (output, src_data.output_frames_gen) ;

	if (verbose != 0)
		printf ("\tOutput Peak :   %6.4f\n", output_peak) ;

	if (fabs (output_peak - test_data->peak_value) > 0.01)
	{	printf ("\n\nLine %d : output peak (%6.4f) should be %6.4f\n\n", __LINE__, output_peak, test_data->peak_value) ;
		save_oct_float ("snr_test.dat", data, BUFFER_LEN, output, output_len) ;
		exit (1) ;
		} ;

	/* Calculate signal-to-noise ratio. */
	snr = calculate_snr (output, src_data.output_frames_gen, test_data->pass_band_peaks) ;

	if (snr < 0.0)
	{	/* An error occurred. */
		save_oct_float ("snr_test.dat", data, BUFFER_LEN, output, src_data.output_frames_gen) ;
		exit (1) ;
		} ;

	if (verbose != 0)
		printf ("\tSNR Ratio   :   %.2f dB\n", snr) ;

	if (snr < test_data->snr)
	{	printf ("\n\nLine %d : SNR (%5.2f) should be > %6.2f dB\n\n", __LINE__, snr, test_data->snr) ;
		exit (1) ;
		} ;

	if (verbose != 0)
		puts ("\t-------------------------------------\n\tPass\n") ;
	else
		puts ("Pass") ;

	return snr ;
} /* snr_test */

static double
find_peak (float *data, int len)
{	double 	peak = 0.0 ;
	int		k = 0 ;

	for (k = 0 ; k < len ; k++)
		if (fabs (data [k]) > peak)
			peak = fabs (data [k]) ;

	return peak ;
} /* find_peak */


static double
find_attenuation (double freq, int converter, int verbose)
{	static float input	[BUFFER_LEN] ;
	static float output [2 * BUFFER_LEN] ;

	SRC_DATA	src_data ;
	double 		output_peak ;
	int			error ;

	gen_windowed_sines (1, &freq, 1.0, input, BUFFER_LEN) ;

	src_data.end_of_input = 1 ; /* Only one buffer worth of input. */

	src_data.data_in = input ;
	src_data.input_frames = BUFFER_LEN ;

	src_data.src_ratio = 1.999 ;

	src_data.data_out = output ;
	src_data.output_frames = ARRAY_LEN (output) ;

	if ((error = src_simple (&src_data, converter, 1)))
	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
		exit (1) ;
		} ;

	output_peak = find_peak (output, ARRAY_LEN (output)) ;

	if (verbose)
		printf ("\tFreq : %6f   InPeak : %6f    OutPeak : %6f   Atten : %6.2f dB\n",
				freq, 1.0, output_peak, 20.0 * log10 (1.0 / output_peak)) ;

	return 20.0 * log10 (1.0 / output_peak) ;
} /* find_attenuation */

static double
bandwidth_test (int converter, int verbose)
{	double	f1, f2, a1, a2 ;
	double	freq, atten ;

	f1 = 0.35 ;
	a1 = find_attenuation (f1, converter, verbose) ;

	f2 = 0.495 ;
	a2 = find_attenuation (f2, converter, verbose) ;

	if (a1 > 3.0 || a2 < 3.0)
	{	printf ("\n\nLine %d : cannot bracket 3dB point.\n\n", __LINE__) ;
		exit (1) ;
		} ;

	while (a2 - a1 > 1.0)
	{	freq = f1 + 0.5 * (f2 - f1) ;
		atten = find_attenuation (freq, converter, verbose) ;

		if (atten < 3.0)
		{	f1 = freq ;
			a1 = atten ;
			}
		else
		{	f2 = freq ;
			a2 = atten ;
			} ;
		} ;

	freq = f1 + (3.0 - a1) * (f2 - f1) / (a2 - a1) ;

	return 200.0 * freq ;
} /* bandwidth_test */

#else /* (HAVE_FFTW3) == 0 */

/* Alternative main function when librfftw is not available. */

int
main (void)
{	puts ("\n"
		"****************************************************************\n"
		" This test cannot be run without FFTW (http://www.fftw.org/).\n"
		" Both the real and the complex versions of the library are\n"
		" required.") ;
	puts ("****************************************************************\n") ;

	return 0 ;
} /* main */

#endif
Commit	Line	Data
8529da43 MG	1	/*
	2	** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
	3	** All rights reserved.
	4	**
	5	** This code is released under 2-clause BSD license. Please see the
	6	** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
	7	*/
	8
	9	#include "config.h"
	10
	11	#include <stdio.h>
	12	#include <stdlib.h>
	13	#include <string.h>
	14	#include <math.h>
	15	#include <time.h>
	16
	17	#if (HAVE_FFTW3)
	18
	19	#include <fftw3.h>
	20
	21	#include <samplerate.h>
	22
	23	#include "util.h"
	24
	25	#define BUFFER_LEN 50000
	26	#define MAX_FREQS 4
	27	#define MAX_RATIOS 6
	28	#define MAX_SPEC_LEN (1<<15)
	29
	30	#ifndef M_PI
	31	#define M_PI 3.14159265358979323846264338
	32	#endif
	33
	34	enum
	35	{ BOOLEAN_FALSE = 0,
	36	BOOLEAN_TRUE = 1
	37	} ;
	38
	39	typedef struct
	40	{ int freq_count ;
	41	double freqs [MAX_FREQS] ;
	42
	43	double src_ratio ;
	44	int pass_band_peaks ;
	45
	46	double snr ;
	47	double peak_value ;
	48	} SINGLE_TEST ;
	49
	50	typedef struct
	51	{ int converter ;
	52	int tests ;
	53	int do_bandwidth_test ;
	54	SINGLE_TEST test_data [10] ;
	55	} CONVERTER_TEST ;
	56
	57	static double snr_test (SINGLE_TEST *snr_test_data, int number, int converter, int verbose) ;
	58	static double find_peak (float *output, int output_len) ;
	59	static double bandwidth_test (int converter, int verbose) ;
	60
	61	int
	62	main (int argc, char *argv [])
	63	{ CONVERTER_TEST snr_test_data [] =
	64	{
65	{ SRC_ZERO_ORDER_HOLD,
66	8,
67	BOOLEAN_FALSE,
68	{ { 1, { 0.01111111111 }, 3.0, 1, 28.0, 1.0 },
69	{ 1, { 0.01111111111 }, 0.6, 1, 36.0, 1.0 },
70	{ 1, { 0.01111111111 }, 0.3, 1, 36.0, 1.0 },
71	{ 1, { 0.01111111111 }, 1.0, 1, 150.0, 1.0 },
72	{ 1, { 0.01111111111 }, 1.001, 1, 38.0, 1.0 },
73	{ 2, { 0.011111, 0.324 }, 1.9999, 2, 14.0, 1.0 },
74	{ 2, { 0.012345, 0.457 }, 0.456789, 1, 12.0, 1.0 },
75	{ 1, { 0.3511111111 }, 1.33, 1, 10.0, 1.0 }
76	}
77	},
78
79	{ SRC_LINEAR,
80	8,
81	BOOLEAN_FALSE,
82	{ { 1, { 0.01111111111 }, 3.0, 1, 73.0, 1.0 },
83	{ 1, { 0.01111111111 }, 0.6, 1, 73.0, 1.0 },
84	{ 1, { 0.01111111111 }, 0.3, 1, 73.0, 1.0 },
85	{ 1, { 0.01111111111 }, 1.0, 1, 150.0, 1.0 },
86	{ 1, { 0.01111111111 }, 1.001, 1, 77.0, 1.0 },
87	{ 2, { 0.011111, 0.324 }, 1.9999, 2, 15.0, 0.94 },
88	{ 2, { 0.012345, 0.457 }, 0.456789, 1, 25.0, 0.96 },
89	{ 1, { 0.3511111111 }, 1.33, 1, 22.0, 0.99 }
90	}
91	},
92
93	{ SRC_SINC_FASTEST,
94	9,
95	BOOLEAN_TRUE,
96	{ { 1, { 0.01111111111 }, 3.0, 1, 100.0, 1.0 },
97	{ 1, { 0.01111111111 }, 0.6, 1, 99.0, 1.0 },
98	{ 1, { 0.01111111111 }, 0.3, 1, 100.0, 1.0 },
99	{ 1, { 0.01111111111 }, 1.0, 1, 150.0, 1.0 },
100	{ 1, { 0.01111111111 }, 1.001, 1, 100.0, 1.0 },
101	{ 2, { 0.011111, 0.324 }, 1.9999, 2, 97.0, 1.0 },
102	{ 2, { 0.012345, 0.457 }, 0.456789, 1, 100.0, 0.5 },
103	{ 2, { 0.011111, 0.45 }, 0.6, 1, 97.0, 0.5 },
104	{ 1, { 0.3511111111 }, 1.33, 1, 97.0, 1.0 }
105	}
106	},
107
108	{ SRC_SINC_MEDIUM_QUALITY,
109	9,
110	BOOLEAN_TRUE,
111	{ { 1, { 0.01111111111 }, 3.0, 1, 145.0, 1.0 },
112	{ 1, { 0.01111111111 }, 0.6, 1, 132.0, 1.0 },
113	{ 1, { 0.01111111111 }, 0.3, 1, 138.0, 1.0 },
114	{ 1, { 0.01111111111 }, 1.0, 1, 157.0, 1.0 },
115	{ 1, { 0.01111111111 }, 1.001, 1, 148.0, 1.0 },
116	{ 2, { 0.011111, 0.324 }, 1.9999, 2, 127.0, 1.0 },
117	{ 2, { 0.012345, 0.457 }, 0.456789, 1, 123.0, 0.5 },
118	{ 2, { 0.011111, 0.45 }, 0.6, 1, 126.0, 0.5 },
119	{ 1, { 0.43111111111 }, 1.33, 1, 121.0, 1.0 }
120	}
121	},
122
123	{ SRC_SINC_BEST_QUALITY,
124	9,
125	BOOLEAN_TRUE,
126	{ { 1, { 0.01111111111 }, 3.0, 1, 147.0, 1.0 },
127	{ 1, { 0.01111111111 }, 0.6, 1, 147.0, 1.0 },
128	{ 1, { 0.01111111111 }, 0.3, 1, 148.0, 1.0 },
129	{ 1, { 0.01111111111 }, 1.0, 1, 155.0, 1.0 },
130	{ 1, { 0.01111111111 }, 1.001, 1, 148.0, 1.0 },
131	{ 2, { 0.011111, 0.324 }, 1.9999, 2, 146.0, 1.0 },
132	{ 2, { 0.012345, 0.457 }, 0.456789, 1, 147.0, 0.5 },
133	{ 2, { 0.011111, 0.45 }, 0.6, 1, 144.0, 0.5 },
134	{ 1, { 0.43111111111 }, 1.33, 1, 145.0, 1.0 }
135	}
136	},
137	} ; /* snr_test_data */
138
139	double best_snr, snr, freq3dB ;
140	int j, k, converter, verbose = 0 ;
141
142	if (argc == 2 && strcmp (argv [1], "--verbose") == 0)
143	verbose = 1 ;
144
145	puts ("") ;
146
147	for (j = 0 ; j < ARRAY_LEN (snr_test_data) ; j++)
148	{ best_snr = 5000.0 ;
149
150	converter = snr_test_data [j].converter ;
151
152	printf (" Converter %d : %s\n", converter, src_get_name (converter)) ;
153	printf (" %s\n", src_get_description (converter)) ;
154
155	for (k = 0 ; k < snr_test_data [j].tests ; k++)
156	{ snr = snr_test (&(snr_test_data [j].test_data [k]), k, converter, verbose) ;
157	if (best_snr > snr)
158	best_snr = snr ;
159	} ;
160
161	printf (" Worst case Signal-to-Noise Ratio : %.2f dB.\n", best_snr) ;
162
163	if (snr_test_data [j].do_bandwidth_test == BOOLEAN_FALSE)
164	{ puts (" Bandwith test not performed on this converter.\n") ;
165	continue ;
166	}
167
168	freq3dB = bandwidth_test (converter, verbose) ;
169
170	printf (" Measured -3dB rolloff point : %5.2f %%.\n\n", freq3dB) ;
171	} ;
172
173	fftw_cleanup () ;
174
175	return 0 ;
176	} /* main */
177
178	/*==============================================================================
179	*/
180
181	static double
182	snr_test (SINGLE_TEST *test_data, int number, int converter, int verbose)
183	{ static float data [BUFFER_LEN + 1] ;
184	static float output [MAX_SPEC_LEN] ;
185
186	SRC_STATE *src_state ;
187	SRC_DATA src_data ;
188
189	double output_peak, snr ;
190	int k, output_len, input_len, error ;
191
192	if (verbose != 0)
193	{ printf ("\tSignal-to-Noise Ratio Test %d.\n"
194	"\t=====================================\n", number) ;
195	printf ("\tFrequencies : [ ") ;
196	for (k = 0 ; k < test_data->freq_count ; k++)
197	printf ("%6.4f ", test_data->freqs [k]) ;
198
199	printf ("]\n\tSRC Ratio : %8.4f\n", test_data->src_ratio) ;
200	}
201	else
202	{ printf ("\tSignal-to-Noise Ratio Test %d : ", number) ;
203	fflush (stdout) ;
204	} ;
205
206	/* Set up the output array. */
207	if (test_data->src_ratio >= 1.0)
208	{ output_len = MAX_SPEC_LEN ;
209	input_len = (int) ceil (MAX_SPEC_LEN / test_data->src_ratio) ;
210	if (input_len > BUFFER_LEN)
211	input_len = BUFFER_LEN ;
212	}
213	else
214	{ input_len = BUFFER_LEN ;
215	output_len = (int) ceil (BUFFER_LEN * test_data->src_ratio) ;
216	output_len &= ((~0u) << 4) ;
217	if (output_len > MAX_SPEC_LEN)
218	output_len = MAX_SPEC_LEN ;
219	input_len = (int) ceil (output_len / test_data->src_ratio) ;
220	} ;
221
222	memset (output, 0, sizeof (output)) ;
223
224	/* Generate input data array. */
225	gen_windowed_sines (test_data->freq_count, test_data->freqs, 1.0, data, input_len) ;
226
227	/* Perform sample rate conversion. */
228	if ((src_state = src_new (converter, 1, &error)) == NULL)
229	{ printf ("\n\nLine %d : src_new() failed : %s.\n\n", __LINE__, src_strerror (error)) ;
230	exit (1) ;
231	} ;
232
233	src_data.end_of_input = 1 ; /* Only one buffer worth of input. */
234
235	src_data.data_in = data ;
236	src_data.input_frames = input_len ;
237
238	src_data.src_ratio = test_data->src_ratio ;
239
240	src_data.data_out = output ;
241	src_data.output_frames = output_len ;
242
243	if ((error = src_process (src_state, &src_data)))
244	{ printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
245	exit (1) ;
246	} ;
247
248	src_state = src_delete (src_state) ;
249
250	if (verbose != 0)
251	printf ("\tOutput Len : %ld\n", src_data.output_frames_gen) ;
252
253	if (abs (src_data.output_frames_gen - output_len) > 4)
254	{ printf ("\n\nLine %d : output data length should be %d.\n\n", __LINE__, output_len) ;
255	exit (1) ;
256	} ;
257
258	/* Check output peak. */
259	output_peak = find_peak (output, src_data.output_frames_gen) ;
260
261	if (verbose != 0)
262	printf ("\tOutput Peak : %6.4f\n", output_peak) ;
263
264	if (fabs (output_peak - test_data->peak_value) > 0.01)
265	{ printf ("\n\nLine %d : output peak (%6.4f) should be %6.4f\n\n", __LINE__, output_peak, test_data->peak_value) ;
266	save_oct_float ("snr_test.dat", data, BUFFER_LEN, output, output_len) ;
267	exit (1) ;
268	} ;
269
270	/* Calculate signal-to-noise ratio. */
271	snr = calculate_snr (output, src_data.output_frames_gen, test_data->pass_band_peaks) ;
272
273	if (snr < 0.0)
274	{ /* An error occurred. */
275	save_oct_float ("snr_test.dat", data, BUFFER_LEN, output, src_data.output_frames_gen) ;
276	exit (1) ;
277	} ;
278
279	if (verbose != 0)
280	printf ("\tSNR Ratio : %.2f dB\n", snr) ;
281
282	if (snr < test_data->snr)
283	{ printf ("\n\nLine %d : SNR (%5.2f) should be > %6.2f dB\n\n", __LINE__, snr, test_data->snr) ;
284	exit (1) ;
285	} ;
286
287	if (verbose != 0)
288	puts ("\t-------------------------------------\n\tPass\n") ;
289	else
290	puts ("Pass") ;
291
292	return snr ;
293	} /* snr_test */
294
295	static double
296	find_peak (float *data, int len)
297	{ double peak = 0.0 ;
298	int k = 0 ;
299
300	for (k = 0 ; k < len ; k++)
301	if (fabs (data [k]) > peak)
302	peak = fabs (data [k]) ;
303
304	return peak ;
305	} /* find_peak */
306
307
308	static double
309	find_attenuation (double freq, int converter, int verbose)
310	{ static float input [BUFFER_LEN] ;
311	static float output [2 * BUFFER_LEN] ;
312
313	SRC_DATA src_data ;
314	double output_peak ;
315	int error ;
316
317	gen_windowed_sines (1, &freq, 1.0, input, BUFFER_LEN) ;
318
319	src_data.end_of_input = 1 ; /* Only one buffer worth of input. */
320
321	src_data.data_in = input ;
322	src_data.input_frames = BUFFER_LEN ;
323
324	src_data.src_ratio = 1.999 ;
325
326	src_data.data_out = output ;
327	src_data.output_frames = ARRAY_LEN (output) ;
328
329	if ((error = src_simple (&src_data, converter, 1)))
330	{ printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
331	exit (1) ;
332	} ;
333
334	output_peak = find_peak (output, ARRAY_LEN (output)) ;
335
336	if (verbose)
337	printf ("\tFreq : %6f InPeak : %6f OutPeak : %6f Atten : %6.2f dB\n",
338	freq, 1.0, output_peak, 20.0 * log10 (1.0 / output_peak)) ;
339
340	return 20.0 * log10 (1.0 / output_peak) ;
341	} /* find_attenuation */
342
343	static double
344	bandwidth_test (int converter, int verbose)
345	{ double f1, f2, a1, a2 ;
346	double freq, atten ;
347
348	f1 = 0.35 ;
349	a1 = find_attenuation (f1, converter, verbose) ;
350
351	f2 = 0.495 ;
352	a2 = find_attenuation (f2, converter, verbose) ;
353
354	if (a1 > 3.0 \|\| a2 < 3.0)
355	{ printf ("\n\nLine %d : cannot bracket 3dB point.\n\n", __LINE__) ;
356	exit (1) ;
357	} ;
358
359	while (a2 - a1 > 1.0)
360	{ freq = f1 + 0.5 * (f2 - f1) ;
361	atten = find_attenuation (freq, converter, verbose) ;
362
363	if (atten < 3.0)
364	{ f1 = freq ;
365	a1 = atten ;
366	}
367	else
368	{ f2 = freq ;
369	a2 = atten ;
370	} ;
371	} ;
372
373	freq = f1 + (3.0 - a1) * (f2 - f1) / (a2 - a1) ;
374
375	return 200.0 * freq ;
376	} /* bandwidth_test */
377
378	#else /* (HAVE_FFTW3) == 0 */
379
380	/* Alternative main function when librfftw is not available. */
381
382	int
383	main (void)
384	{ puts ("\n"
385	"****************************************************************\n"
386	" This test cannot be run without FFTW (http://www.fftw.org/).\n"
387	" Both the real and the complex versions of the library are\n"
388	" required.") ;
389	puts ("****************************************************************\n") ;
390
391	return 0 ;
392	} /* main */
393
394	#endif
395