/media/libtremor/lib/mdct.h

http://github.com/zpao/v8monkey · C Header · 52 lines · 18 code · 18 blank · 16 comment · 0 complexity · d2e73b4e720d4eba72d498d1620f37a4 MD5 · raw file

  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. function: modified discrete cosine transform prototypes
  14. ********************************************************************/
  15. #ifndef _OGG_mdct_H_
  16. #define _OGG_mdct_H_
  17. #include "ivorbiscodec.h"
  18. #include "misc.h"
  19. #define DATA_TYPE ogg_int32_t
  20. #define REG_TYPE register ogg_int32_t
  21. #ifdef _LOW_ACCURACY_
  22. #define cPI3_8 (0x0062)
  23. #define cPI2_8 (0x00b5)
  24. #define cPI1_8 (0x00ed)
  25. #else
  26. #define cPI3_8 (0x30fbc54d)
  27. #define cPI2_8 (0x5a82799a)
  28. #define cPI1_8 (0x7641af3d)
  29. #endif
  30. extern void mdct_forward(int n, DATA_TYPE *in, DATA_TYPE *out);
  31. extern void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out);
  32. #endif