1 /********************************************************************
2  *                                                                  *
3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
7  *                                                                  *
8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
10  *                                                                  *
11  ********************************************************************
12 
13  function: fft transform
14  last mod: $Id: smallft.h 13293 2007-07-24 00:09:47Z xiphmont $
15 
16  ********************************************************************/
17 
18 #ifndef _V_SMFT_H_
19 #define _V_SMFT_H_
20 
21 #include "vorbis/codec.h"
22 
23 typedef struct {
24   int n;
25   float *trigcache;
26   int *splitcache;
27 } drft_lookup;
28 
29 extern void drft_forward(drft_lookup *l,float *data);
30 extern void drft_backward(drft_lookup *l,float *data);
31 extern void drft_init(drft_lookup *l,int n);
32 extern void drft_clear(drft_lookup *l);
33 
34 #endif
35