dbf-halloween2015

annotate libs/vorbis/mdct.h @ 2:5ae5fd3626fa

macosx port works
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 01 Nov 2015 00:51:36 +0200
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nuclear@1 1 /********************************************************************
nuclear@1 2 * *
nuclear@1 3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
nuclear@1 4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
nuclear@1 5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
nuclear@1 6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
nuclear@1 7 * *
nuclear@1 8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
nuclear@1 9 * by the Xiph.Org Foundation http://www.xiph.org/ *
nuclear@1 10 * *
nuclear@1 11 ********************************************************************
nuclear@1 12
nuclear@1 13 function: modified discrete cosine transform prototypes
nuclear@1 14 last mod: $Id: mdct.h 16227 2009-07-08 06:58:46Z xiphmont $
nuclear@1 15
nuclear@1 16 ********************************************************************/
nuclear@1 17
nuclear@1 18 #ifndef _OGG_mdct_H_
nuclear@1 19 #define _OGG_mdct_H_
nuclear@1 20
nuclear@1 21 #include "vorbis/codec.h"
nuclear@1 22
nuclear@1 23
nuclear@1 24
nuclear@1 25
nuclear@1 26
nuclear@1 27 /*#define MDCT_INTEGERIZED <- be warned there could be some hurt left here*/
nuclear@1 28 #ifdef MDCT_INTEGERIZED
nuclear@1 29
nuclear@1 30 #define DATA_TYPE int
nuclear@1 31 #define REG_TYPE register int
nuclear@1 32 #define TRIGBITS 14
nuclear@1 33 #define cPI3_8 6270
nuclear@1 34 #define cPI2_8 11585
nuclear@1 35 #define cPI1_8 15137
nuclear@1 36
nuclear@1 37 #define FLOAT_CONV(x) ((int)((x)*(1<<TRIGBITS)+.5))
nuclear@1 38 #define MULT_NORM(x) ((x)>>TRIGBITS)
nuclear@1 39 #define HALVE(x) ((x)>>1)
nuclear@1 40
nuclear@1 41 #else
nuclear@1 42
nuclear@1 43 #define DATA_TYPE float
nuclear@1 44 #define REG_TYPE float
nuclear@1 45 #define cPI3_8 .38268343236508977175F
nuclear@1 46 #define cPI2_8 .70710678118654752441F
nuclear@1 47 #define cPI1_8 .92387953251128675613F
nuclear@1 48
nuclear@1 49 #define FLOAT_CONV(x) (x)
nuclear@1 50 #define MULT_NORM(x) (x)
nuclear@1 51 #define HALVE(x) ((x)*.5f)
nuclear@1 52
nuclear@1 53 #endif
nuclear@1 54
nuclear@1 55
nuclear@1 56 typedef struct {
nuclear@1 57 int n;
nuclear@1 58 int log2n;
nuclear@1 59
nuclear@1 60 DATA_TYPE *trig;
nuclear@1 61 int *bitrev;
nuclear@1 62
nuclear@1 63 DATA_TYPE scale;
nuclear@1 64 } mdct_lookup;
nuclear@1 65
nuclear@1 66 extern void mdct_init(mdct_lookup *lookup,int n);
nuclear@1 67 extern void mdct_clear(mdct_lookup *l);
nuclear@1 68 extern void mdct_forward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);
nuclear@1 69 extern void mdct_backward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);
nuclear@1 70
nuclear@1 71 #endif