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 

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    52