/*** 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/libsndfile/libsamplerate/blob/master/COPYING*/ #include <stdio.h>#include <stdlib.h>#include <math.h> #include <samplerate.h> #include "util.h" #define	SHORT_BUFFER_LEN	2048#define	LONG_BUFFER_LEN		((1 << 16) - 20) static void simple_test (int converter) ;static void stream_test (int converter, double ratio) ;static void init_term_test (int converter, double ratio) ; static int	next_block_length (int reset) ; intmain (void){	static double src_ratios [] =	{	0.999900, 1.000100, 0.789012, 1.200000, 0.333333, 3.100000,		0.125000, 8.000000, 0.099900, 9.990000, 0.100000, 10.00000	} ; 	int k ; 	puts ("\n    Zero Order Hold interpolator:") ; 	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)		init_term_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;	puts ("") ;	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)		stream_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;  	puts ("\n    Linear interpolator:") ;	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)		init_term_test (SRC_LINEAR, src_ratios [k]) ;	puts ("") ;	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)		stream_test (SRC_LINEAR, src_ratios [k]) ;  	puts ("\n    Sinc interpolator:") ;	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)		init_term_test (SRC_SINC_FASTEST, src_ratios [k]) ;	puts ("") ;	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)		stream_test (SRC_SINC_FASTEST, src_ratios [k]) ; 	puts ("") ; 	simple_test (SRC_SINC_FASTEST) ; 	return 0 ;} /* main */ static voidsimple_test (int converter){	// MSVC doesn't support variable-length arrays	#define ilen 199030	#define olen 1000	int error ; 	{		float in [ilen] ;		float out [olen] ;		double ratio = (1.0 * olen) / ilen ;		SRC_DATA src_data =		{	in, out,			ilen, olen,			0, 0, 0,			ratio		} ; 		error = src_simple (&src_data, converter, 1) ;		if (error)		{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;			exit (1) ;			} ;	} ;     return ;} /* simple_test */ static voidinit_term_test (int converter, double src_ratio){	static float input [SHORT_BUFFER_LEN], output [SHORT_BUFFER_LEN] ; 	SRC_DATA	src_data ; 	int k, input_len, output_len, error, terminate ; 	printf ("\tinit_term_test   (SRC ratio = %7.4f) .......... ", src_ratio) ;	fflush (stdout) ; 	/* Calculate maximun input and output lengths. */	if (src_ratio >= 1.0)	{	output_len = SHORT_BUFFER_LEN ;		input_len = (int) floor (SHORT_BUFFER_LEN / src_ratio) ;		}	else	{	input_len = SHORT_BUFFER_LEN ;		output_len = (int) floor (SHORT_BUFFER_LEN * src_ratio) ;		} ; 	/* Reduce input_len by 10 so output is longer than necessary. */	input_len -= 10 ; 	for (k = 0 ; k < ARRAY_LEN (input) ; k++)		input [k] = 1.0 ; 	if (output_len > SHORT_BUFFER_LEN)	{	printf ("\n\nLine %d : output_len > SHORT_BUFFER_LEN\n\n", __LINE__) ;		exit (1) ;		} ; 	src_data.data_in = input ;	src_data.input_frames = input_len ; 	src_data.src_ratio = src_ratio ; 	src_data.data_out = output ;	src_data.output_frames = SHORT_BUFFER_LEN ; 	if ((error = src_simple (&src_data, converter, 1)))	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;		exit (1) ;		} ; 	terminate = (int) ceil ((src_ratio >= 1.0) ? 1 : 1.0 / src_ratio) ; 	if (fabs (src_ratio * input_len - src_data.output_frames_gen) > terminate)	{	printf ("\n\nLine %d : Bad output frame count.\n\n", __LINE__) ;		printf ("\tterminate             : %d\n", terminate) ;		printf ("\tsrc_ratio             : %.4f\n", src_ratio) ;		printf ("\tinput_len             : %d\n"				"\tinput_len * src_ratio : %f\n", input_len, input_len * src_ratio) ;		printf ("\toutput_frames_gen     : %ld\n\n", src_data.output_frames_gen) ;		exit (1) ;		} ; 	if (labs (src_data.input_frames_used - input_len) > 1)	{	printf ("\n\nLine %d : input_frames_used should be %d, is %ld.\n\n",					 __LINE__, input_len, src_data.input_frames_used) ;		printf ("\tsrc_ratio  : %.4f\n", src_ratio) ;		printf ("\tinput_len  : %d\n\tinput_used : %ld\n\n", input_len, src_data.input_frames_used) ;		exit (1) ;		} ; 	if (fabs (output [0]) < 0.1)	{	printf ("\n\nLine %d : First output sample is bad.\n\n", __LINE__) ;		printf ("\toutput [0] == %f\n\n", output [0]) ;		exit (1) ;		} 	puts ("ok") ; 	return ;} /* init_term_test */ static voidstream_test (int converter, double src_ratio){	static float input [LONG_BUFFER_LEN], output [LONG_BUFFER_LEN] ; 	SRC_STATE	*src_state ;	SRC_DATA	src_data ; 	int input_len, output_len, current_in, current_out ;	int k, error, terminate ; 	printf ("\tstream_test      (SRC ratio = %7.4f) .......... ", src_ratio) ;	fflush (stdout) ; /* Erik */for (k = 0 ; k < LONG_BUFFER_LEN ; k++) input [k] = k * 1.0f ; 	/* Calculate maximun input and output lengths. */	if (src_ratio >= 1.0)	{	output_len = LONG_BUFFER_LEN ;		input_len = (int) floor (LONG_BUFFER_LEN / src_ratio) ;		}	else	{	input_len = LONG_BUFFER_LEN ;		output_len = (int) floor (LONG_BUFFER_LEN * src_ratio) ;		} ; 	/* Reduce input_len by 10 so output is longer than necessary. */	input_len -= 20 ; 	if (output_len > LONG_BUFFER_LEN)	{	printf ("\n\nLine %d : output_len > LONG_BUFFER_LEN\n\n", __LINE__) ;		exit (1) ;		} ; 	current_in = current_out = 0 ; 	/* 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 = 0 ; /* Set this later. */ 	src_data.data_in = input ; 	src_data.src_ratio = src_ratio ; 	src_data.data_out = output ;	src_data.output_frames = ARRAY_LEN (output) / 10 ; 	terminate = 1 + (int) ceil ((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio) ; 	while (1)	{		src_data.input_frames = next_block_length (0) ;		src_data.input_frames = MIN (src_data.input_frames, input_len - current_in) ; 		src_data.output_frames = ARRAY_LEN (output) - current_out ;		/*-Erik MIN (src_data.output_frames, output_len - current_out) ;-*/ 		src_data.end_of_input = (current_in >= input_len) ? 1 : 0 ; 		if ((error = src_process (src_state, &src_data)))		{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;			printf ("  src_data.input_frames  : %ld\n", src_data.input_frames) ;			printf ("  src_data.output_frames : %ld\n\n", src_data.output_frames) ;			exit (1) ;			} ; 		if (src_data.end_of_input && src_data.output_frames_gen == 0)			break ; 		if (src_data.input_frames_used > src_data.input_frames)		{	printf ("\n\nLine %d : input_frames_used > input_frames\n\n", __LINE__) ;			printf ("  src_data.input_frames      : %ld\n", src_data.input_frames) ;			printf ("  src_data.input_frames_used : %ld\n", src_data.input_frames_used) ;			printf ("  src_data.output_frames     : %ld\n", src_data.output_frames) ;			printf ("  src_data.output_frames_gen : %ld\n\n", src_data.output_frames_gen) ;			exit (1) ;			} ; 		if (src_data.input_frames_used < 0)		{	printf ("\n\nLine %d : input_frames_used (%ld) < 0\n\n", __LINE__, src_data.input_frames_used) ;			exit (1) ;			} ; 		if (src_data.output_frames_gen < 0)		{	printf ("\n\nLine %d : output_frames_gen (%ld) < 0\n\n", __LINE__, src_data.output_frames_gen) ;			exit (1) ;			} ; 		current_in	+= src_data.input_frames_used ;		current_out += src_data.output_frames_gen ; 		if (current_in > input_len + terminate)		{	printf ("\n\nLine %d : current_in (%d) > input_len (%d + %d)\n\n", __LINE__, current_in, input_len, terminate) ;			exit (1) ;			} ; 		if (current_out > output_len)		{	printf ("\n\nLine %d : current_out (%d) > output_len (%d)\n\n", __LINE__, current_out, output_len) ;			exit (1) ;			} ; 		if (src_data.input_frames_used > input_len)		{	printf ("\n\nLine %d : input_frames_used (%ld) > %d\n\n", __LINE__, src_data.input_frames_used, input_len) ;			exit (1) ;			} ; 		if (src_data.output_frames_gen > output_len)		{	printf ("\n\nLine %d : output_frames_gen (%ld) > %d\n\n", __LINE__, src_data.output_frames_gen, output_len) ;			exit (1) ;			} ; 		if (src_data.data_in == NULL && src_data.output_frames_gen == 0)			break ;  		src_data.data_in	+= src_data.input_frames_used ;		src_data.data_out	+= src_data.output_frames_gen ;		} ; 	src_state = src_delete (src_state) ; 	if (fabs (current_out - src_ratio * input_len) > terminate)	{	printf ("\n\nLine %d : bad output data length %d should be %2.1f +/- %d.\n", __LINE__,					current_out, src_ratio * input_len, terminate) ;		printf ("\tsrc_ratio  : %.4f\n", src_ratio) ;		printf ("\tinput_len  : %d\n\tinput_used : %d\n", input_len, current_in) ;		printf ("\toutput_len : %d\n\toutput_gen : %d\n\n", output_len, current_out) ;		exit (1) ;		} ; 	if (current_in != input_len)	{	printf ("\n\nLine %d : unused input.\n", __LINE__) ;		printf ("\tinput_len         : %d\n", input_len) ;		printf ("\tinput_frames_used : %d\n\n", current_in) ;		exit (1) ;		} ; 	puts ("ok") ; 	return ;} /* stream_test */ static intnext_block_length (int reset){	static int block_lengths [] = /* Should be an odd length. */	{	/*-2, 500, 5, 400, 10, 300, 20, 200, 50, 100, 70 -*/		5, 400, 10, 300, 20, 200, 50, 100, 70		} ;	static int block_len_index = 0 ; 	if (reset)		block_len_index = 0 ;	else		block_len_index = (block_len_index + 1) % ARRAY_LEN (block_lengths) ; 	return block_lengths [block_len_index] ;} /* next_block_length */