/*  ----------------------------------------------------------------	Speech Signal Processing Toolkit (SPTK): version 3.0			 SPTK Working Group		   Department of Computer Science		   Nagoya Institute of Technology				and    Interdisciplinary Graduate School of Science and Engineering		   Tokyo Institute of Technology		      Copyright (c) 1984-2000			All Rights Reserved.  Permission is hereby granted, free of charge, to use and  distribute this software and its documentation without  restriction, including without limitation the rights to use,  copy, modify, merge, publish, distribute, sublicense, and/or  sell copies of this work, and to permit persons to whom this  work is furnished to do so, subject to the following conditions:    1. The code must retain the above copyright notice, this list       of conditions and the following disclaimer.    2. Any modifications must be clearly marked as such.  NAGOYA INSTITUTE OF TECHNOLOGY, TOKYO INSITITUTE OF TECHNOLOGY,  SPTK WORKING GROUP, AND THE CONTRIBUTORS TO THIS WORK DISCLAIM  ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT  SHALL NAGOYA INSTITUTE OF TECHNOLOGY, TOKYO INSITITUTE OF  TECHNOLOGY, SPTK WORKING GROUP, NOR THE CONTRIBUTORS BE LIABLE  FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY  DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,  WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS  ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR  PERFORMANCE OF THIS SOFTWARE. ----------------------------------------------------------------*//*************************************************************************									**    Inverse FFT for Complex Sequence					**									**	usage:								**		ifft [ infile ] [ options ] > stdout			**									**	options:							**		-l l	 :  FFT size power of 2		[256]		**		-R	 :  real part					**		-I	 :  imaginary part				**	infile:								**		stdin for default					**		input is assumed to be real				**									*************************************************************************//*  Standard C Libraries  */#include <stdio.h>#include <math.h>#include <SPTK.h>#include <string.h>/*  Required Functions  */int ifft(double*, double*, int);static int	size = 256, out = ' ';/*  Command Name  */char	*cmnd;int usage(){	fprintf(stderr, "\n");	fprintf(stderr, " %s - inverse FFT for complex sequence\n", cmnd);	fprintf(stderr, "\n");	fprintf(stderr, "  usage:\n");	fprintf(stderr, "       %s [ options ] [ infile ] > stdout\n", cmnd);	fprintf(stderr, "  options:\n");	fprintf(stderr, "       -l l  : FFT size power of 2 [256]\n");	fprintf(stderr, "       -R    : real part\n");	fprintf(stderr, "       -I    : imaginary part\n");	fprintf(stderr, "       -h    : print this message\n");	fprintf(stderr, "  infile:\n");	fprintf(stderr, "       data sequence (float)       [stdin]\n");	fprintf(stderr, "  stdout:\n");	fprintf(stderr, "       IFFT sequence (float)\n");	fprintf(stderr, "\n");	exit(1);}main(argc,argv)int	argc;char	*argv[];{	FILE	*fp, *fopen();	char	*s, *infile = NULL, c;		if ((cmnd = strrchr(argv[0], '/')) == NULL)	        cmnd = argv[0];	else	        cmnd++;	while (--argc){		if(*(s = *++argv) == '-') {			c = *++s;			if( c == 'l' && *++s == '\0' ) {				s = *++argv;				--argc;			}			switch(c) {			case 'l':				size = atoi(s);				break;			case 'i':			case 'r':				c -= ('a' - 'A');			case 'I':			case 'R':				out = c;				break;			case 'h':			default:				usage();			}		}		else			infile = s;	}	if(infile) {		fp = getfp(infile, "r");		dft(fp);		fclose(fp);	}	else		dft(stdin);	exit(0);}dft(fp)FILE	*fp;{	double		*x, *y;	register int	size2;	static int	size_f;	x = dgetmem(size2 = size + size);	y = x + size;	while(!feof(fp)) {		if( freadf(x, sizeof(*x), size2, fp) != size2 )				break;					ifft(x, y, size);		if(out != 'I')			fwritef(x, sizeof(*x), size, stdout);		if(out != 'R')			fwritef(y, sizeof(*y), size, stdout);	}	return(0);}