/******************************************************************** *                                                                  * * 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 1994-2002             * * by the XIPHOPHORUS Company http://www.xiph.org/                  * *                                                                  * ******************************************************************** function: modified discrete cosine transform prototypes last mod: $Id: mdct.h 7187 2004-07-20 07:24:27Z 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<<TRIGBITS)+.5))#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)#endiftypedef 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