Chris@1: /********************************************************************
Chris@1:  *                                                                  *
Chris@1:  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
Chris@1:  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
Chris@1:  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
Chris@1:  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
Chris@1:  *                                                                  *
Chris@1:  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *
Chris@1:  * by the Xiph.Org Foundation http://www.xiph.org/                  *
Chris@1:  *                                                                  *
Chris@1:  ********************************************************************
Chris@1: 
Chris@1:  function: modified discrete cosine transform prototypes
Chris@1:  last mod: $Id: mdct.h 16227 2009-07-08 06:58:46Z xiphmont $
Chris@1: 
Chris@1:  ********************************************************************/
Chris@1: 
Chris@1: #ifndef _OGG_mdct_H_
Chris@1: #define _OGG_mdct_H_
Chris@1: 
Chris@1: #include "vorbis/codec.h"
Chris@1: 
Chris@1: 
Chris@1: 
Chris@1: 
Chris@1: 
Chris@1: /*#define MDCT_INTEGERIZED  <- be warned there could be some hurt left here*/
Chris@1: #ifdef MDCT_INTEGERIZED
Chris@1: 
Chris@1: #define DATA_TYPE int
Chris@1: #define REG_TYPE  register int
Chris@1: #define TRIGBITS 14
Chris@1: #define cPI3_8 6270
Chris@1: #define cPI2_8 11585
Chris@1: #define cPI1_8 15137
Chris@1: 
Chris@1: #define FLOAT_CONV(x) ((int)((x)*(1<<TRIGBITS)+.5))
Chris@1: #define MULT_NORM(x) ((x)>>TRIGBITS)
Chris@1: #define HALVE(x) ((x)>>1)
Chris@1: 
Chris@1: #else
Chris@1: 
Chris@1: #define DATA_TYPE float
Chris@1: #define REG_TYPE  float
Chris@1: #define cPI3_8 .38268343236508977175F
Chris@1: #define cPI2_8 .70710678118654752441F
Chris@1: #define cPI1_8 .92387953251128675613F
Chris@1: 
Chris@1: #define FLOAT_CONV(x) (x)
Chris@1: #define MULT_NORM(x) (x)
Chris@1: #define HALVE(x) ((x)*.5f)
Chris@1: 
Chris@1: #endif
Chris@1: 
Chris@1: 
Chris@1: typedef struct {
Chris@1:   int n;
Chris@1:   int log2n;
Chris@1: 
Chris@1:   DATA_TYPE *trig;
Chris@1:   int       *bitrev;
Chris@1: 
Chris@1:   DATA_TYPE scale;
Chris@1: } mdct_lookup;
Chris@1: 
Chris@1: extern void mdct_init(mdct_lookup *lookup,int n);
Chris@1: extern void mdct_clear(mdct_lookup *l);
Chris@1: extern void mdct_forward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);
Chris@1: extern void mdct_backward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);
Chris@1: 
Chris@1: #endif