| [16] | 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 1994-2007 * |
|---|
| 9 | * by the Xiph.Org Foundation http://www.xiph.org/ * |
|---|
| 10 | * * |
|---|
| 11 | ******************************************************************** |
|---|
| 12 | |
|---|
| 13 | function: modified discrete cosine transform prototypes |
|---|
| 14 | last mod: $Id: mdct.h 13293 2007-07-24 00:09:47Z xiphmont $ |
|---|
| 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 |
|---|
| 72 | |
|---|
| 73 | |
|---|
| 74 | |
|---|
| 75 | |
|---|
| 76 | |
|---|
| 77 | |
|---|
| 78 | |
|---|
| 79 | |
|---|
| 80 | |
|---|
| 81 | |
|---|
| 82 | |
|---|
| 83 | |
|---|
