/*** Copyright (c) 2003-2016, 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/libsndfile/libsamplerate/blob/master/COPYING*/ #include <stdio.h>#include <stdlib.h>#include <string.h>#include <math.h> #include <samplerate.h> #include "util.h" #define	BUFFER_LEN		10000#define CB_READ_LEN		256 static void callback_test (int converter, double ratio) ;static void end_of_stream_test (int converter) ; intmain (void){	static double src_ratios [] =	{	1.0, 0.099, 0.1, 0.33333333, 0.789, 1.0001, 1.9, 3.1, 9.9	} ; 	int k ; 	puts ("") ; 	puts ("    Zero Order Hold interpolator :") ;	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)		callback_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ; 	puts ("    Linear interpolator :") ;	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)		callback_test (SRC_LINEAR, src_ratios [k]) ; 	puts ("    Sinc interpolator :") ;	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)		callback_test (SRC_SINC_FASTEST, src_ratios [k]) ; 	puts ("") ; 	puts ("    End of stream test :") ;	end_of_stream_test (SRC_ZERO_ORDER_HOLD) ;	end_of_stream_test (SRC_LINEAR) ;	end_of_stream_test (SRC_SINC_FASTEST) ; 	puts ("") ;	return 0 ;} /* main */ /*=====================================================================================*/ typedef struct{	int channels ;	long count, total ;	int end_of_data ;	float data [BUFFER_LEN] ;} TEST_CB_DATA ; static longtest_callback_func (void *cb_data, float **data){	TEST_CB_DATA *pcb_data ; 	long frames ; 	if ((pcb_data = cb_data) == NULL)		return 0 ; 	if (data == NULL)		return 0 ; 	if (pcb_data->total - pcb_data->count > CB_READ_LEN)		frames = CB_READ_LEN / pcb_data->channels ;	else		frames = (pcb_data->total - pcb_data->count) / pcb_data->channels ; 	*data = pcb_data->data + pcb_data->count ;	pcb_data->count += frames ; 	return frames ;} /* test_callback_func */  static voidcallback_test (int converter, double src_ratio){	static TEST_CB_DATA test_callback_data ;	static float output [BUFFER_LEN] ; 	SRC_STATE	*src_state ; 	long	read_count, read_total ;	int 	error ; 	printf ("\tcallback_test    (SRC ratio = %6.4f) ........... ", src_ratio) ;	fflush (stdout) ; 	test_callback_data.channels = 2 ;	test_callback_data.count = 0 ;	test_callback_data.end_of_data = 0 ;	test_callback_data.total = ARRAY_LEN (test_callback_data.data) ; 	if ((src_state = src_callback_new (test_callback_func, converter, test_callback_data.channels, &error, &test_callback_data)) == NULL)	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;		exit (1) ;		} ; 	read_total = 0 ;	do	{	/* We will be throwing away output data, so just grab as much as possible. */		read_count = ARRAY_LEN (output) / test_callback_data.channels ;		read_count = src_callback_read (src_state, src_ratio, read_count, output) ;		read_total += read_count ;		}	while (read_count > 0) ; 	if ((error = src_error (src_state)) != 0)	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;		exit (1) ;		} ; 	src_state = src_delete (src_state) ; 	if (fabs (read_total / src_ratio - ARRAY_LEN (test_callback_data.data)) > 2.0)	{	printf ("\n\nLine %d : input / output length mismatch.\n\n", __LINE__) ;		printf ("    input len  : %d\n", ARRAY_LEN (test_callback_data.data)) ;		printf ("    output len : %ld (should be %g +/- 2)\n\n", read_total,					floor (0.5 + src_ratio * ARRAY_LEN (test_callback_data.data))) ;		exit (1) ;		} ; 	puts ("ok") ; 	return ;} /* callback_test */ /*=====================================================================================*/ static longeos_callback_func (void *cb_data, float **data){	TEST_CB_DATA *pcb_data ;	long frames ; 	if (data == NULL)		return 0 ; 	if ((pcb_data = cb_data) == NULL)		return 0 ; 	/*	**	Return immediately if there is no more data.	**	In this case, the output pointer 'data' will not be set and	**	valgrind should not warn about it.	*/	if (pcb_data->end_of_data)		return 0 ; 	if (pcb_data->total - pcb_data->count > CB_READ_LEN)		frames = CB_READ_LEN / pcb_data->channels ;	else		frames = (pcb_data->total - pcb_data->count) / pcb_data->channels ; 	*data = pcb_data->data + pcb_data->count ;	pcb_data->count += frames ; 	/*	**	Set end_of_data so that the next call to the callback function will	**	return zero ocunt without setting the 'data' pointer.	*/	if (pcb_data->total < 2 * pcb_data->count)		pcb_data->end_of_data = 1 ; 	return frames ;} /* eos_callback_data */  static voidend_of_stream_test (int converter){	static TEST_CB_DATA test_callback_data ;	static float output [BUFFER_LEN] ; 	SRC_STATE	*src_state ; 	double	src_ratio = 0.3 ;	long	read_count, read_total ;	int 	error ; 	printf ("\t%-30s        ........... ", src_get_name (converter)) ;	fflush (stdout) ; 	test_callback_data.channels = 2 ;	test_callback_data.count = 0 ;	test_callback_data.end_of_data = 0 ;	test_callback_data.total = ARRAY_LEN (test_callback_data.data) ; 	if ((src_state = src_callback_new (eos_callback_func, converter, test_callback_data.channels, &error, &test_callback_data)) == NULL)	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;		exit (1) ;		} ; 	read_total = 0 ;	do	{	/* We will be throwing away output data, so just grab as much as possible. */		read_count = ARRAY_LEN (output) / test_callback_data.channels ;		read_count = src_callback_read (src_state, src_ratio, read_count, output) ;		read_total += read_count ;		}	while (read_count > 0) ; 	if ((error = src_error (src_state)) != 0)	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;		exit (1) ;		} ; 	src_state = src_delete (src_state) ; 	if (test_callback_data.end_of_data == 0)	{	printf ("\n\nLine %d : test_callback_data.end_of_data should not be 0."				" This is a bug in the test.\n\n", __LINE__) ;		exit (1) ;		} ; 	puts ("ok") ;	return ;} /* end_of_stream_test */