/********************************************************************

 *                                                                  *

 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *

 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *

 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *

 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *

 *                                                                  *

 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *

 * by the Xiph.Org Foundation http://www.xiph.org/                  *

 *                                                                  *

 ********************************************************************

 function: modified discrete cosine transform prototypes

 last mod: $Id: mdct.h 16227 2009-07-08 06:58:46Z xiphmont $

 ********************************************************************/

#ifndef _OGG_mdct_H_

#define _OGG_mdct_H_

#include "vorbis/codec.h"

/*#define MDCT_INTEGERIZED  <- be warned there could be some hurt left here*/

#ifdef MDCT_INTEGERIZED

#define DATA_TYPE int

#define REG_TYPE  register int

#define TRIGBITS 14

#define cPI3_8 6270

#define cPI2_8 11585

#define cPI1_8 15137

#define FLOAT_CONV(x) ((int)((x)*(1<

#define MULT_NORM(x) ((x)>>TRIGBITS)

#define HALVE(x) ((x)>>1)

#else

#define DATA_TYPE float

#define REG_TYPE  float

#define cPI3_8 .38268343236508977175F

#define cPI2_8 .70710678118654752441F

#define cPI1_8 .92387953251128675613F

#define FLOAT_CONV(x) (x)

#define MULT_NORM(x) (x)

#define HALVE(x) ((x)*.5f)

#endif

typedef struct {

  int n;

  int log2n;

  DATA_TYPE *trig;

  int       *bitrev;

  DATA_TYPE scale;

} mdct_lookup;

extern void mdct_init(mdct_lookup *lookup,int n);

extern void mdct_clear(mdct_lookup *l);

extern void mdct_forward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);

extern void mdct_backward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);

#endif