| 1 | /********************************************************************
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| 2 | * *
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| 3 | * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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| 4 | * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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| 5 | * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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| 6 | * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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| 7 | * *
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| 8 | * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
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| 9 | * by the Xiph.Org Foundation https://xiph.org/ *
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| 10 | * *
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| 11 | ********************************************************************
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| 12 |
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| 13 | function: modified discrete cosine transform prototypes
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| 14 |
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| 15 | ********************************************************************/
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| 16 |
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| 17 | #ifndef _OGG_mdct_H_
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| 18 | #define _OGG_mdct_H_
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| 19 |
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| 20 | #include "vorbis/codec.h"
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| 21 |
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| 22 |
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| 23 |
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| 24 |
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| 25 |
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| 26 | /*#define MDCT_INTEGERIZED <- be warned there could be some hurt left here*/
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| 27 | #ifdef MDCT_INTEGERIZED
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| 28 |
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| 29 | #define DATA_TYPE int
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| 30 | #define REG_TYPE register int
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| 31 | #define TRIGBITS 14
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| 32 | #define cPI3_8 6270
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| 33 | #define cPI2_8 11585
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| 34 | #define cPI1_8 15137
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| 35 |
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| 36 | #define FLOAT_CONV(x) ((int)((x)*(1<<TRIGBITS)+.5))
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| 37 | #define MULT_NORM(x) ((x)>>TRIGBITS)
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| 38 | #define HALVE(x) ((x)>>1)
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| 39 |
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| 40 | #else
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| 41 |
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| 42 | #define DATA_TYPE float
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| 43 | #define REG_TYPE float
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| 44 | #define cPI3_8 .38268343236508977175F
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| 45 | #define cPI2_8 .70710678118654752441F
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| 46 | #define cPI1_8 .92387953251128675613F
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| 47 |
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| 48 | #define FLOAT_CONV(x) (x)
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| 49 | #define MULT_NORM(x) (x)
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| 50 | #define HALVE(x) ((x)*.5f)
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| 51 |
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| 52 | #endif
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| 53 |
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| 54 |
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| 55 | typedef struct {
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| 56 | int n;
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| 57 | int log2n;
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| 58 |
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| 59 | DATA_TYPE *trig;
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| 60 | int *bitrev;
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| 61 |
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| 62 | DATA_TYPE scale;
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| 63 | } mdct_lookup;
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| 64 |
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| 65 | extern void mdct_init(mdct_lookup *lookup,int n);
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| 66 | extern void mdct_clear(mdct_lookup *l);
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| 67 | extern void mdct_forward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);
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| 68 | extern void mdct_backward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);
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| 69 |
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| 70 | #endif
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