michael@0: /********************************************************************
michael@0:  *                                                                  *
michael@0:  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
michael@0:  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
michael@0:  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
michael@0:  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
michael@0:  *                                                                  *
michael@0:  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
michael@0:  * by the Xiph.Org Foundation http://www.xiph.org/                  *
michael@0:  *                                                                  *
michael@0:  ********************************************************************
michael@0: 
michael@0:  function: fft transform
michael@0:  last mod: $Id: smallft.h 13293 2007-07-24 00:09:47Z xiphmont $
michael@0: 
michael@0:  ********************************************************************/
michael@0: 
michael@0: #ifndef _V_SMFT_H_
michael@0: #define _V_SMFT_H_
michael@0: 
michael@0: #include "vorbis/codec.h"
michael@0: 
michael@0: typedef struct {
michael@0:   int n;
michael@0:   float *trigcache;
michael@0:   int *splitcache;
michael@0: } drft_lookup;
michael@0: 
michael@0: extern void drft_forward(drft_lookup *l,float *data);
michael@0: extern void drft_backward(drft_lookup *l,float *data);
michael@0: extern void drft_init(drft_lookup *l,int n);
michael@0: extern void drft_clear(drft_lookup *l);
michael@0: 
michael@0: #endif