vrshoot
annotate libs/vorbis/mdct.h @ 0:b2f14e535253
initial commit
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 01 Feb 2014 19:58:19 +0200 |
| parents | |
| children |
| rev | line source |
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| nuclear@0 | 1 /******************************************************************** |
| nuclear@0 | 2 * * |
| nuclear@0 | 3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * |
| nuclear@0 | 4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * |
| nuclear@0 | 5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * |
| nuclear@0 | 6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * |
| nuclear@0 | 7 * * |
| nuclear@0 | 8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 * |
| nuclear@0 | 9 * by the Xiph.Org Foundation http://www.xiph.org/ * |
| nuclear@0 | 10 * * |
| nuclear@0 | 11 ******************************************************************** |
| nuclear@0 | 12 |
| nuclear@0 | 13 function: modified discrete cosine transform prototypes |
| nuclear@0 | 14 last mod: $Id: mdct.h 16227 2009-07-08 06:58:46Z xiphmont $ |
| nuclear@0 | 15 |
| nuclear@0 | 16 ********************************************************************/ |
| nuclear@0 | 17 |
| nuclear@0 | 18 #ifndef _OGG_mdct_H_ |
| nuclear@0 | 19 #define _OGG_mdct_H_ |
| nuclear@0 | 20 |
| nuclear@0 | 21 #include "vorbis/codec.h" |
| nuclear@0 | 22 |
| nuclear@0 | 23 |
| nuclear@0 | 24 |
| nuclear@0 | 25 |
| nuclear@0 | 26 |
| nuclear@0 | 27 /*#define MDCT_INTEGERIZED <- be warned there could be some hurt left here*/ |
| nuclear@0 | 28 #ifdef MDCT_INTEGERIZED |
| nuclear@0 | 29 |
| nuclear@0 | 30 #define DATA_TYPE int |
| nuclear@0 | 31 #define REG_TYPE register int |
| nuclear@0 | 32 #define TRIGBITS 14 |
| nuclear@0 | 33 #define cPI3_8 6270 |
| nuclear@0 | 34 #define cPI2_8 11585 |
| nuclear@0 | 35 #define cPI1_8 15137 |
| nuclear@0 | 36 |
| nuclear@0 | 37 #define FLOAT_CONV(x) ((int)((x)*(1<<TRIGBITS)+.5)) |
| nuclear@0 | 38 #define MULT_NORM(x) ((x)>>TRIGBITS) |
| nuclear@0 | 39 #define HALVE(x) ((x)>>1) |
| nuclear@0 | 40 |
| nuclear@0 | 41 #else |
| nuclear@0 | 42 |
| nuclear@0 | 43 #define DATA_TYPE float |
| nuclear@0 | 44 #define REG_TYPE float |
| nuclear@0 | 45 #define cPI3_8 .38268343236508977175F |
| nuclear@0 | 46 #define cPI2_8 .70710678118654752441F |
| nuclear@0 | 47 #define cPI1_8 .92387953251128675613F |
| nuclear@0 | 48 |
| nuclear@0 | 49 #define FLOAT_CONV(x) (x) |
| nuclear@0 | 50 #define MULT_NORM(x) (x) |
| nuclear@0 | 51 #define HALVE(x) ((x)*.5f) |
| nuclear@0 | 52 |
| nuclear@0 | 53 #endif |
| nuclear@0 | 54 |
| nuclear@0 | 55 |
| nuclear@0 | 56 typedef struct { |
| nuclear@0 | 57 int n; |
| nuclear@0 | 58 int log2n; |
| nuclear@0 | 59 |
| nuclear@0 | 60 DATA_TYPE *trig; |
| nuclear@0 | 61 int *bitrev; |
| nuclear@0 | 62 |
| nuclear@0 | 63 DATA_TYPE scale; |
| nuclear@0 | 64 } mdct_lookup; |
| nuclear@0 | 65 |
| nuclear@0 | 66 extern void mdct_init(mdct_lookup *lookup,int n); |
| nuclear@0 | 67 extern void mdct_clear(mdct_lookup *l); |
| nuclear@0 | 68 extern void mdct_forward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out); |
| nuclear@0 | 69 extern void mdct_backward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out); |
| nuclear@0 | 70 |
| nuclear@0 | 71 #endif |