/*** Copyright (c) 2005-2016, 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 "src_config.h" #include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <math.h> #if (HAVE_SNDFILE) #include <samplerate.h>#include <sndfile.h> #define ARRAY_LEN(x)	((int) (sizeof (x) / sizeof ((x) [0]))) #define DEFAULT_CONVERTER 	SRC_SINC_MEDIUM_QUALITY #define	BUFFER_LEN			1024#define	INPUT_STEP_SIZE		8 typedef struct{	sf_count_t	index ;	double		ratio ;} TIMEWARP_FACTOR ; static void usage_exit (const char *progname) ;static sf_count_t timewarp_convert (SNDFILE *infile, SNDFILE *outfile, int converter, int channels) ; intmain (int argc, char *argv []){	SNDFILE	*infile, *outfile ;	SF_INFO sfinfo ;	sf_count_t	count ; 	if (argc != 3)		usage_exit (argv [0]) ; 	putchar ('\n') ;	printf ("Input File    : %s\n", argv [argc - 2]) ;	if ((infile = sf_open (argv [argc - 2], SFM_READ, &sfinfo)) == NULL)	{	printf ("Error : Not able to open input file '%s'\n", argv [argc - 2]) ;		exit (1) ;		} ; 	if (INPUT_STEP_SIZE * sfinfo.channels > BUFFER_LEN)	{	printf ("\n\nError : INPUT_STEP_SIZE * sfinfo.channels > BUFFER_LEN\n\n") ;		exit (1) ;		} ;  	/* Delete the output file length to zero if already exists. */	remove (argv [argc - 1]) ; 	if ((outfile = sf_open (argv [argc - 1], SFM_WRITE, &sfinfo)) == NULL)	{	printf ("Error : Not able to open output file '%s'\n", argv [argc - 1]) ;		sf_close (infile) ;		exit (1) ;		} ; 	sf_command (outfile, SFC_SET_CLIPPING, NULL, SF_TRUE) ; 	printf ("Output file   : %s\n", argv [argc - 1]) ;	printf ("Converter     : %s\n", src_get_name (DEFAULT_CONVERTER)) ; 	count = timewarp_convert (infile, outfile, DEFAULT_CONVERTER, sfinfo.channels) ; 	printf ("Output Frames : %ld\n\n", (long) count) ; 	sf_close (infile) ;	sf_close (outfile) ; 	return 0 ;} /* main */ /*==============================================================================*/ static TIMEWARP_FACTOR warp [] ={	{	0		, 1.00000001 },	{	20000	, 1.01000000 },	{	20200	, 1.00000001 },	{	40000	, 1.20000000 },	{	40300	, 1.00000001 },	{	60000	, 1.10000000 },	{	60400	, 1.00000001 },	{	80000	, 1.50000000 },	{	81000	, 1.00000001 },} ; static sf_count_ttimewarp_convert (SNDFILE *infile, SNDFILE *outfile, int converter, int channels){	static float input [BUFFER_LEN] ;	static float output [BUFFER_LEN] ; 	SRC_STATE	*src_state ;	SRC_DATA	src_data ;	int			error, warp_index = 0 ;	sf_count_t	input_count = 0, output_count = 0 ; 	sf_seek (infile, 0, SEEK_SET) ;	sf_seek (outfile, 0, SEEK_SET) ; 	/* Initialize the sample rate converter. */	if ((src_state = src_new (converter, channels, &error)) == NULL)	{	printf ("\n\nError : src_new() failed : %s.\n\n", src_strerror (error)) ;		exit (1) ;		} ; 	src_data.end_of_input = 0 ; /* Set this later. */ 	/* Start with zero to force load in while loop. */	src_data.input_frames = 0 ;	src_data.data_in = input ; 	if (warp [0].index > 0)		src_data.src_ratio = 1.0 ;	else	{	src_data.src_ratio = warp [0].ratio ;		warp_index ++ ;		} ; 	src_data.data_out = output ;	src_data.output_frames = BUFFER_LEN /channels ; 	while (1)	{		if (warp_index < ARRAY_LEN (warp) - 1 && input_count >= warp [warp_index].index)		{	src_data.src_ratio = warp [warp_index].ratio ;			warp_index ++ ;			} ; 		/* If the input buffer is empty, refill it. */		if (src_data.input_frames == 0)		{	src_data.input_frames = (long) sf_readf_float (infile, input, INPUT_STEP_SIZE) ;			input_count += src_data.input_frames ;			src_data.data_in = input ; 			/* The last read will not be a full buffer, so snd_of_input. */			if (src_data.input_frames < INPUT_STEP_SIZE)				src_data.end_of_input = SF_TRUE ;			} ; 		/* Process current block. */		if ((error = src_process (src_state, &src_data)))		{	printf ("\nError : %s\n", src_strerror (error)) ;			exit (1) ;			} ; 		/* Terminate if done. */		if (src_data.end_of_input && src_data.output_frames_gen == 0)			break ; 		/* Write output. */		sf_writef_float (outfile, output, src_data.output_frames_gen) ;		output_count += src_data.output_frames_gen ; 		src_data.data_in += src_data.input_frames_used * channels ;		src_data.input_frames -= src_data.input_frames_used ;		} ; 	src_delete (src_state) ; 	return output_count ;} /* timewarp_convert */ /*------------------------------------------------------------------------------*/ static voidusage_exit (const char *progname){	const char	*cptr ; 	if ((cptr = strrchr (progname, '/')) != NULL)		progname = cptr + 1 ; 	if ((cptr = strrchr (progname, '\\')) != NULL)		progname = cptr + 1 ; 	printf ("\n"		"  A program demonstrating the time warping capabilities of libsamplerate."		"  It uses libsndfile for file I/O and Secret Rabbit Code (aka libsamplerate)"		"  for performing the warping.\n"		"  It works on any file format supported by libsndfile with any \n"		"  number of channels (limited only by host memory).\n"		"\n"		"  The warping is dependant on a table hard code into the source code.\n"		"\n"		"  libsamplerate version : %s\n"		"\n"		"  Usage : \n"		"       %s <input file> <output file>\n"		"\n", src_get_version (), progname) ; 	puts ("") ; 	exit (1) ;} /* usage_exit */ /*==============================================================================*/ #else /* (HAVE_SNFILE == 0) */ /* Alternative main function when libsndfile is not available. */ intmain (void){	puts (		"\n"		"****************************************************************\n"		"  This example program was compiled without libsndfile \n"		"  (https://github.com/libsndfile/libsndfile/).\n"		"  It is therefore completely broken and non-functional.\n"		"****************************************************************\n"		"\n"		) ; 	return 0 ;} /* main */ #endif