cannam@126: /*
cannam@126: ** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
cannam@126: ** All rights reserved.
cannam@126: **
cannam@126: ** This code is released under 2-clause BSD license. Please see the
cannam@126: ** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
cannam@126: */
cannam@126: 
cannam@126: #include <stdio.h>
cannam@126: #include <stdlib.h>
cannam@126: #include <string.h>
cannam@126: #include <math.h>
cannam@126: 
cannam@126: #include <samplerate.h>
cannam@126: 
cannam@126: #include "util.h"
cannam@126: 
cannam@126: #define	BUFFER_LEN		2048
cannam@126: 
cannam@126: static void simple_test (int converter, double ratio) ;
cannam@126: 
cannam@126: int
cannam@126: main (void)
cannam@126: {	static double src_ratios [] =
cannam@126: 	{	1.0001, 0.099, 0.1, 0.33333333, 0.789, 1.9, 3.1, 9.9
cannam@126: 	} ;
cannam@126: 
cannam@126: 	int k ;
cannam@126: 
cannam@126: 	puts ("") ;
cannam@126: 
cannam@126: 	puts ("    Zero Order Hold interpolator :") ;
cannam@126: 	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
cannam@126: 		simple_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;
cannam@126: 
cannam@126: 	puts ("    Linear interpolator :") ;
cannam@126: 	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
cannam@126: 		simple_test (SRC_LINEAR, src_ratios [k]) ;
cannam@126: 
cannam@126: 	puts ("    Sinc interpolator :") ;
cannam@126: 	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
cannam@126: 		simple_test (SRC_SINC_FASTEST, src_ratios [k]) ;
cannam@126: 
cannam@126: 	puts ("") ;
cannam@126: 
cannam@126: 	return 0 ;
cannam@126: } /* main */
cannam@126: 
cannam@126: static void
cannam@126: simple_test (int converter, double src_ratio)
cannam@126: {	static float input [BUFFER_LEN], output [BUFFER_LEN] ;
cannam@126: 
cannam@126: 	SRC_DATA	src_data ;
cannam@126: 
cannam@126: 	int input_len, output_len, error, terminate ;
cannam@126: 
cannam@126: 	printf ("\tsimple_test      (SRC ratio = %6.4f) ........... ", src_ratio) ;
cannam@126: 	fflush (stdout) ;
cannam@126: 
cannam@126: 	/* Calculate maximun input and output lengths. */
cannam@126: 	if (src_ratio >= 1.0)
cannam@126: 	{	output_len = BUFFER_LEN ;
cannam@126: 		input_len = (int) floor (BUFFER_LEN / src_ratio) ;
cannam@126: 		}
cannam@126: 	else
cannam@126: 	{	input_len = BUFFER_LEN ;
cannam@126: 		output_len = (int) floor (BUFFER_LEN * src_ratio) ;
cannam@126: 		} ;
cannam@126: 
cannam@126: 	/* Reduce input_len by 10 so output is longer than necessary. */
cannam@126: 	input_len -= 10 ;
cannam@126: 
cannam@126: 	if (output_len > BUFFER_LEN)
cannam@126: 	{	printf ("\n\nLine %d : output_len > BUFFER_LEN\n\n", __LINE__) ;
cannam@126: 		exit (1) ;
cannam@126: 		} ;
cannam@126: 
cannam@126: 	memset (&src_data, 0, sizeof (src_data)) ;
cannam@126: 
cannam@126: 	src_data.data_in = input ;
cannam@126: 	src_data.input_frames = input_len ;
cannam@126: 
cannam@126: 	src_data.src_ratio = src_ratio ;
cannam@126: 
cannam@126: 	src_data.data_out = output ;
cannam@126: 	src_data.output_frames = BUFFER_LEN ;
cannam@126: 
cannam@126: 	if ((error = src_simple (&src_data, converter, 1)))
cannam@126: 	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
cannam@126: 		exit (1) ;
cannam@126: 		} ;
cannam@126: 
cannam@126: 	terminate = (int) ceil ((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio) ;
cannam@126: 
cannam@126: 	if (fabs (src_data.output_frames_gen - src_ratio * input_len) > 2 * terminate)
cannam@126: 	{	printf ("\n\nLine %d : bad output data length %ld should be %d.\n", __LINE__,
cannam@126: 					src_data.output_frames_gen, (int) floor (src_ratio * input_len)) ;
cannam@126: 		printf ("\tsrc_ratio  : %.4f\n", src_ratio) ;
cannam@126: 		printf ("\tinput_len  : %d\n\toutput_len : %d\n\n", input_len, output_len) ;
cannam@126: 		exit (1) ;
cannam@126: 		} ;
cannam@126: 
cannam@126: 	puts ("ok") ;
cannam@126: 
cannam@126: 	return ;
cannam@126: } /* simple_test */
cannam@126: