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 
37 extern void mdct_forward(int n, DATA_TYPE *in, DATA_TYPE *out);
38 extern void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out);
39 
40 #endif
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