/media/libtremor/lib/mdct.h

 1/********************************************************************
 2 *                                                                  *
 3 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
 4 *                                                                  *
 5 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
 6 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
 7 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
 8 *                                                                  *
 9 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
10 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
11 *                                                                  *
12 ********************************************************************
13
14 function: modified discrete cosine transform prototypes
15
16 ********************************************************************/
17
18#ifndef _OGG_mdct_H_
19#define _OGG_mdct_H_
20
21#include "ivorbiscodec.h"
22#include "misc.h"
23
24#define DATA_TYPE ogg_int32_t
25#define REG_TYPE  register ogg_int32_t
26
27#ifdef _LOW_ACCURACY_
28#define cPI3_8 (0x0062)
29#define cPI2_8 (0x00b5)
30#define cPI1_8 (0x00ed)
31#else
32#define cPI3_8 (0x30fbc54d)
33#define cPI2_8 (0x5a82799a)
34#define cPI1_8 (0x7641af3d)
35#endif
36
37extern void mdct_forward(int n, DATA_TYPE *in, DATA_TYPE *out);
38extern void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out);
39
40#endif
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