| /******************************************************************** |
| * * |
| * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * |
| * * |
| * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * |
| * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * |
| * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * |
| * * |
| * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 * |
| * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * |
| * * |
| ******************************************************************** |
| |
| function: modified discrete cosine transform prototypes |
| |
| ********************************************************************/ |
| |
| #ifndef _OGG_mdct_H_ |
| #define _OGG_mdct_H_ |
| |
| #include "ivorbiscodec.h" |
| #include "misc.h" |
| |
| #define DATA_TYPE ogg_int32_t |
| #define REG_TYPE register ogg_int32_t |
| |
| #ifdef _LOW_ACCURACY_ |
| #define cPI3_8 (0x0062) |
| #define cPI2_8 (0x00b5) |
| #define cPI1_8 (0x00ed) |
| #else |
| #define cPI3_8 (0x30fbc54d) |
| #define cPI2_8 (0x5a82799a) |
| #define cPI1_8 (0x7641af3d) |
| #endif |
| |
| extern void mdct_backward(int n, DATA_TYPE *in); |
| extern void mdct_shift_right(int n, DATA_TYPE *in, DATA_TYPE *right); |
| extern void mdct_unroll_lap(int n0,int n1, |
| int lW,int W, |
| DATA_TYPE *in,DATA_TYPE *right, |
| LOOKUP_T *w0,LOOKUP_T *w1, |
| ogg_int16_t *out, |
| int step, |
| int start,int end /* samples, this frame */); |
| |
| #endif |
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