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46 lines
1.5 KiB
46 lines
1.5 KiB
/******************************************************************** |
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* * |
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* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * |
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * |
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * |
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * |
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* * |
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* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 * |
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* by the XIPHOPHORUS Company http://www.xiph.org/ * |
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* * |
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******************************************************************** |
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function: fft transform |
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last mod: $Id: smallft.h,v 1.3 2003/09/16 18:35:45 jm Exp $ |
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********************************************************************/ |
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/** |
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@file smallft.h |
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@brief Discrete Rotational Fourier Transform (DRFT) |
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*/ |
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#ifndef _V_SMFT_H_ |
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#define _V_SMFT_H_ |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/** Discrete Rotational Fourier Transform lookup */ |
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struct drft_lookup{ |
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int n; |
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float *trigcache; |
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int *splitcache; |
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}; |
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extern void spx_drft_forward(struct drft_lookup *l,float *data); |
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extern void spx_drft_backward(struct drft_lookup *l,float *data); |
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extern void spx_drft_init(struct drft_lookup *l,int n); |
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extern void spx_drft_clear(struct drft_lookup *l); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif
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