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