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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 http://www.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 last mod: $Id: mdct.h 16227 2009-07-08 06:58:46Z xiphmont $
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15
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16 ********************************************************************/
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17
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18 #ifndef _OGG_mdct_H_
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19 #define _OGG_mdct_H_
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20
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21 #include "vorbis/codec.h"
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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
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27 /*#define MDCT_INTEGERIZED <- be warned there could be some hurt left here*/
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28 #ifdef MDCT_INTEGERIZED
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29
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30 #define DATA_TYPE int
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31 #define REG_TYPE register int
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32 #define TRIGBITS 14
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33 #define cPI3_8 6270
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34 #define cPI2_8 11585
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35 #define cPI1_8 15137
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36
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37 #define FLOAT_CONV(x) ((int)((x)*(1<<TRIGBITS)+.5))
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38 #define MULT_NORM(x) ((x)>>TRIGBITS)
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39 #define HALVE(x) ((x)>>1)
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40
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41 #else
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42
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43 #define DATA_TYPE float
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44 #define REG_TYPE float
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45 #define cPI3_8 .38268343236508977175F
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46 #define cPI2_8 .70710678118654752441F
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47 #define cPI1_8 .92387953251128675613F
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48
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49 #define FLOAT_CONV(x) (x)
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50 #define MULT_NORM(x) (x)
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51 #define HALVE(x) ((x)*.5f)
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52
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53 #endif
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54
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55
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56 typedef struct {
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57 int n;
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58 int log2n;
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59
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60 DATA_TYPE *trig;
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61 int *bitrev;
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62
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63 DATA_TYPE scale;
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64 } mdct_lookup;
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65
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66 extern void mdct_init(mdct_lookup *lookup,int n);
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67 extern void mdct_clear(mdct_lookup *l);
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68 extern void mdct_forward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);
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69 extern void mdct_backward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);
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70
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71 #endif
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