misc/libtremor/mdct.h
changeset 5170 f7e49eff3708
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5169:e353ca78d28b 5170:f7e49eff3708
       
     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
       
    41 
       
    42 
       
    43 
       
    44 
       
    45 
       
    46 
       
    47 
       
    48 
       
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    52