/*** 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 <stdlib.h>#include <stdio.h>#include <math.h> #include <samplerate.h> #include "util.h" #define	BUFFER_LEN		(1<<15) #define BLOCK_LEN		100 static void stream_test (int converter, double ratio) ; intmain (void){	static double src_ratios [] =	{	0.3, 0.9, 1.1, 3.0	} ; 	int k ; 	puts ("\n    Zero Order Hold interpolator:") ;	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++)		stream_test (SRC_LINEAR, src_ratios [k]) ; 	puts ("\n    Sinc interpolator:") ;	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)		stream_test (SRC_SINC_FASTEST, src_ratios [k]) ; 	puts ("") ; 	return 0 ;} /* main */ static voidstream_test (int converter, double src_ratio){	static float input [BUFFER_LEN], output [BUFFER_LEN] ; 	SRC_STATE	*src_state ;	SRC_DATA	src_data ; 	int input_len, output_len, current_in, current_out ;	int error, terminate ; 	printf ("\tstreaming_test   (SRC ratio = %6.4f) ........... ", src_ratio) ;	fflush (stdout) ; 	/* Calculate maximun input and output lengths. */	if (src_ratio >= 1.0)	{	output_len = BUFFER_LEN ;		input_len = (int) floor (BUFFER_LEN / src_ratio) ;		}	else	{	input_len = BUFFER_LEN ;		output_len = (int) floor (BUFFER_LEN * src_ratio) ;		} ; 	/* Reduce input_len by 10 so output is longer than necessary. */	input_len -= 10 ; 	if (output_len > BUFFER_LEN)	{	printf ("\n\nLine %d : output_len > 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.input_frames = BLOCK_LEN ; 	src_data.src_ratio = src_ratio ; 	src_data.data_out = output ;	src_data.output_frames = BLOCK_LEN ; 	while (1)	{	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", src_data.output_frames) ; 			exit (1) ;			} ; 		if (src_data.end_of_input && src_data.output_frames_gen == 0)			break ; 		current_in	+= src_data.input_frames_used ;		current_out += src_data.output_frames_gen ; 		src_data.data_in	+= src_data.input_frames_used ;		src_data.data_out	+= src_data.output_frames_gen ; 		src_data.input_frames	= MIN (BLOCK_LEN, input_len - current_in) ;		src_data.output_frames	= MIN (BLOCK_LEN, output_len - current_out) ; 		src_data.end_of_input = (current_in >= input_len) ? 1 : 0 ;		} ; 	src_state = src_delete (src_state) ; 	terminate = (int) ceil ((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio) ; 	if (fabs (current_out - src_ratio * input_len) > 2 * terminate)	{	printf ("\n\nLine %d : bad output data length %d should be %d.\n", __LINE__,					current_out, (int) floor (src_ratio * input_len)) ;		printf ("\tsrc_ratio  : %.4f\n", src_ratio) ;		printf ("\tinput_len  : %d\n\toutput_len : %d\n\n", input_len, output_len) ;		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 */