/* * FAAC - Freeware Advanced Audio Coder * $Id: fft.h,v 1.6 2005/02/02 07:50:35 sur Exp $ * Copyright (C) 2002 Krzysztof Nikiel * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details.  * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA * */ #ifndef _FFT_H_#define _FFT_H_ typedef float fftfloat; #if defined DRM && !defined DRM_1024 #define MAX_FFT 10 typedef struct{    /*      cfg[Max FFT][FFT and inverse FFT] */    void*   cfg[MAX_FFT][2];} FFT_Tables; #else  /* use own FFT */ typedef struct{    fftfloat **costbl;    fftfloat **negsintbl;    unsigned short **reordertbl;} FFT_Tables; #endif /* defined DRM && !defined DRM_1024 */ void fft_initialize		( FFT_Tables *fft_tables );void fft_terminate	( FFT_Tables *fft_tables ); void rfft			( FFT_Tables *fft_tables, double *x, int logm );void fft			( FFT_Tables *fft_tables, double *xr, double *xi, int logm );void ffti			( FFT_Tables *fft_tables, double *xr, double *xi, int logm ); #endif