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mdct.h (2027B)
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1 /********************************************************************
2 * *
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
7 * *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
9 * by the XIPHOPHORUS Company http://www.xiph.org/ *
10 * *
11 ********************************************************************
12
13 function: modified discrete cosine transform prototypes
14 last mod: $Id: mdct.h 1919 2005-07-24 14:18:04Z baford $
15
16 ********************************************************************/
17
18 #ifndef _OGG_mdct_H_
19 #define _OGG_mdct_H_
20
21 #include "vorbis/codec.h"
22
23
24
25
26
27 /*#define MDCT_INTEGERIZED <- be warned there could be some hurt left here*/
28 #ifdef MDCT_INTEGERIZED
29
30 #define DATA_TYPE int
31 #define REG_TYPE register int
32 #define TRIGBITS 14
33 #define cPI3_8 6270
34 #define cPI2_8 11585
35 #define cPI1_8 15137
36
37 #define FLOAT_CONV(x) ((int)((x)*(1<<TRIGBITS)+.5))
38 #define MULT_NORM(x) ((x)>>TRIGBITS)
39 #define HALVE(x) ((x)>>1)
40
41 #else
42
43 #define DATA_TYPE float
44 #define REG_TYPE float
45 #define cPI3_8 .38268343236508977175F
46 #define cPI2_8 .70710678118654752441F
47 #define cPI1_8 .92387953251128675613F
48
49 #define FLOAT_CONV(x) (x)
50 #define MULT_NORM(x) (x)
51 #define HALVE(x) ((x)*.5f)
52
53 #endif
54
55
56 typedef struct {
57 int n;
58 int log2n;
59
60 DATA_TYPE *trig;
61 int *bitrev;
62
63 DATA_TYPE scale;
64 } mdct_lookup;
65
66 extern void mdct_init(mdct_lookup *lookup,int n);
67 extern void mdct_clear(mdct_lookup *l);
68 extern void mdct_forward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);
69 extern void mdct_backward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);
70
71 #endif
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