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