ref: 516916a8cd0ae7c8bff45d91ec720ae2484e3fae
dir: /libfaad/fixed.h/
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003 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 1.11 2003/10/09 20:04:24 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)
typedef int32_t real_t;
#define REAL_CONST(A) ((real_t)((A)*(REAL_PRECISION)))
#define COEF_CONST(A) ((real_t)((A)*(COEF_PRECISION)))
#if defined(_WIN32) && !defined(_WIN32_WCE)
/* multiply real with real */
static INLINE MUL(real_t A, real_t B)
{
_asm {
mov eax,A
imul B
#if 0
shrd eax,edx,REAL_BITS
#else
shr eax,REAL_BITS
shl edx,(32-REAL_BITS)
or eax,edx
#endif
}
}
/* multiply coef with coef */
static INLINE MUL_C_C(real_t A, real_t B)
{
_asm {
mov eax,A
imul B
#if 0
shrd eax,edx,COEF_BITS
#else
shr eax,COEF_BITS
shl edx,(32-COEF_BITS)
or eax,edx
#endif
}
}
/* multiply real with coef */
static INLINE MUL_R_C(real_t A, real_t B)
{
_asm {
mov eax,A
imul B
#if 0
shrd eax,edx,COEF_BITS
#else
shr eax,COEF_BITS
shl edx,(32-COEF_BITS)
or eax,edx
#endif
}
}
#elif 0 //defined(_WIN32_WCE) && defined(ARM)
/* multiply real with real */
static INLINE MUL(real_t A, real_t B)
{
__emit(0xe0c23190); // smull r3, r2, r0, r1
__emit(0xe1b03723); // movs r3, r3, lsr #14
__emit(0xe0a30902); // adc r0, r3, r2, lsl #18
}
/* multiply coef with coef */
static INLINE MUL_C_C(real_t A, real_t B)
{
__emit(0xe0c23190); // smull r3, r2, r0, r1
__emit(0xe1b03e23); // movs r3, r3, lsr #28
__emit(0xe0a30202); // adc r0, r3, r2, lsl #4
}
/* multiply real with coef */
static INLINE MUL_R_C(real_t A, real_t B)
{
__emit(0xe0c23190); // smull r3, r2, r0, r1
__emit(0xe1b03e23); // movs r3, r3, lsr #28
__emit(0xe0a30202); // adc r0, r3, r2, lsl #4
}
#elif defined(__GNUC__) && defined (__arm__)
/* taken from MAD */
#define arm_mul(x, y, SCALEBITS) \
({ uint32_t __hi; \
uint32_t __lo; \
uint32_t __result; \
asm ("smull %0, %1, %3, %4\n\t" \
"movs %0, %0, lsr %5\n\t" \
"adc %2, %0, %1, lsl %6" \
: "=&r" (__lo), "=&r" (__hi), "=r" (__result) \
: "%r" (x), "r" (y), \
"M" (SCALEBITS), "M" (32 - (SCALEBITS)) \
: "cc"); \
__result; \
})
static INLINE real_t MUL(real_t A, real_t B)
{
return arm_mul( A, B, REAL_BITS);
}
static INLINE real_t MUL_C_C(real_t A, real_t B)
{
return arm_mul( A, B, COEF_BITS);
}
static INLINE real_t MUL_R_C(real_t A, real_t B)
{
return arm_mul( A, B, COEF_BITS);
}
#else
/* multiply real with real */
#define MUL(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (REAL_BITS-1))) >> REAL_BITS)
/* multiply coef with coef */
#define MUL_C_C(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (COEF_BITS-1))) >> COEF_BITS)
/* multiply real with coef */
#define MUL_R_C(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (COEF_BITS-1))) >> COEF_BITS)
#endif
#ifdef __cplusplus
}
#endif
#endif