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
23typedef struct {
24  int n;
25  float *trigcache;
26  int *splitcache;
27} drft_lookup;
28
29extern void drft_forward(drft_lookup *l,float *data);
30extern void drft_backward(drft_lookup *l,float *data);
31extern void drft_init(drft_lookup *l,int n);
32extern void drft_clear(drft_lookup *l);
33
34#endif
35