cannam@86: /********************************************************************
cannam@86:  *                                                                  *
cannam@86:  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
cannam@86:  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
cannam@86:  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
cannam@86:  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
cannam@86:  *                                                                  *
cannam@86:  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
cannam@86:  * by the Xiph.Org Foundation http://www.xiph.org/                  *
cannam@86:  *                                                                  *
cannam@86:  ********************************************************************
cannam@86: 
cannam@86:  function: fft transform
cannam@86:  last mod: $Id: smallft.h 13293 2007-07-24 00:09:47Z xiphmont $
cannam@86: 
cannam@86:  ********************************************************************/
cannam@86: 
cannam@86: #ifndef _V_SMFT_H_
cannam@86: #define _V_SMFT_H_
cannam@86: 
cannam@86: #include "vorbis/codec.h"
cannam@86: 
cannam@86: typedef struct {
cannam@86:   int n;
cannam@86:   float *trigcache;
cannam@86:   int *splitcache;
cannam@86: } drft_lookup;
cannam@86: 
cannam@86: extern void drft_forward(drft_lookup *l,float *data);
cannam@86: extern void drft_backward(drft_lookup *l,float *data);
cannam@86: extern void drft_init(drft_lookup *l,int n);
cannam@86: extern void drft_clear(drft_lookup *l);
cannam@86: 
cannam@86: #endif