mirror of
https://github.com/cookiengineer/audacity
synced 2025-10-31 22:23:54 +01:00
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/********************************************************************
|
|
* *
|
|
* 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<<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)
|
|
|
|
#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
|