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 https://xiph.org/ *
10 * *
11 ********************************************************************
12
13 function: fft transform
14
15 ********************************************************************/
16
17#ifndef _V_SMFT_H_
18#define _V_SMFT_H_
19
20#include "vorbis/codec.h"
21
22typedef struct {
23 int n;
24 float *trigcache;
25 int *splitcache;
26} drft_lookup;
27
28extern void drft_forward(drft_lookup *l,float *data);
29extern void drft_backward(drft_lookup *l,float *data);
30extern void drft_init(drft_lookup *l,int n);
31extern void drft_clear(drft_lookup *l);
32
33#endif
34