47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
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/********************************************************************
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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: $Id$
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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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