www.pudn.com > iMagic_2006_0428_v098r23.rar > fixed.h

/* 
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding 
** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com 
**   
** This program is free software; you can redistribute it and/or modify 
** it under the terms of the GNU General Public License as published by 
** the Free Software Foundation; either version 2 of the License, or 
** (at your option) any later version. 
**  
** This program is distributed in the hope that it will be useful, 
** but WITHOUT ANY WARRANTY; without even the implied warranty of 
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
** GNU General Public License for more details. 
**  
** You should have received a copy of the GNU General Public License 
** along with this program; if not, write to the Free Software  
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
** 
** Any non-GPL usage of this software or parts of this software is strictly 
** forbidden. 
** 
** Commercial non-GPL licensing of this software is possible. 
** For more info contact Ahead Software through Mpeg4AAClicense@nero.com. 
** 
** $Id: fixed.h,v 1.18 2004/01/28 19:17:25 menno Exp $ 
**/ 
 
#ifndef __FIXED_H__ 
#define __FIXED_H__ 
 
#ifdef __cplusplus 
extern "C" { 
#endif 
 
 
#define COEF_BITS 28 
#define COEF_PRECISION (1 << COEF_BITS) 
#define REAL_BITS 14 // MAXIMUM OF 14 FOR FIXED POINT SBR 
#define REAL_PRECISION (1 << REAL_BITS) 
 
/* FRAC is the fractional only part of the fixed point number [0.0..1.0) */ 
#define FRAC_SIZE 32 /* frac is a 32 bit integer */ 
#define FRAC_BITS 31 
#define FRAC_PRECISION ((uint32_t)(1 << FRAC_BITS)) 
#define FRAC_MAX 0x7FFFFFFF 
 
typedef int32_t real_t; 
 
#define REAL_CONST(A) (((A) >= 0) ? ((int32_t)((A)*(REAL_PRECISION)+0.5)) : ((int32_t)((A)*(REAL_PRECISION)-0.5))) 
 
 
static INLINE int32_t MUL_FX2(int32_t A, int32_t B) 
{ 
   int64_t  S; 
   int32_t BX; 
 
   BX = B << 16;  
   S = ((int64_t)A*(int64_t)BX) >> 32;  //get hi register 
   S = S+S; 
   return (int32_t)S; 
 
} 
 
 
static INLINE int32_t MUL_FND2(int32_t A, int32_t B) 
{ 
   int64_t  S; 
   int32_t BX; 
 
   BX = B << 16;  
   S = ((int64_t)A*(int64_t)BX) >> 32;  //get hi register 
   return (int32_t)S; 
} 
 
 
static INLINE int32_t MLA_FX2(int32_t A, int32_t B, int32_t C) 
{ 
   int64_t  S; 
   int32_t BX; 
   A = A+A; 
   BX = B << 16;  
   S = ((int64_t)A*(int64_t)BX) >> 32;  //get hi register 
   S = S+C; 
   return (int32_t)S; 
 
} 
 
 
static INLINE int32_t MUL_DND2(int32_t A, int32_t B) 
{ 
 
   int64_t  S; 
   int32_t BX; 
   A = A+A; 
   BX = B <<16;  
   S = ((int64_t)A*(int64_t)BX) >> 32;  //get hi register 
   return (int32_t)S; 
 
} 
 
 
static INLINE int32_t MAD_FX_MUL2(int32_t A, int32_t B) 
{ 
   int64_t  S; 
   int32_t BX; 
 
   BX = B << 16;  
   S = ((int64_t)A*(int64_t)BX) >> 32;  //get hi register 
   S = S+S; 
   return (int32_t)S; 
} 
 
 
 
 
 
 
 
#ifdef __cplusplus 
} 
#endif 
#endif