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 49 50 51 52 53