tremor/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
  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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