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https://github.com/cookiengineer/audacity
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35 lines
1.3 KiB
C
35 lines
1.3 KiB
C
/********************************************************************
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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 1994-2007 *
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* by the Xiph.Org Foundation 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 13293 2007-07-24 00:09:47Z xiphmont $
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********************************************************************/
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#ifndef _V_SMFT_H_
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#define _V_SMFT_H_
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#include "vorbis/codec.h"
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typedef struct {
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int n;
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float *trigcache;
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int *splitcache;
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} drft_lookup;
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extern void drft_forward(drft_lookup *l,float *data);
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extern void drft_backward(drft_lookup *l,float *data);
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extern void drft_init(drft_lookup *l,int n);
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extern void drft_clear(drft_lookup *l);
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#endif
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