ref: 25d8da725925e03cc0a65f82645a0c47d27067c8
dir: /libfaac/fft.h/
/*
* 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