mirror of https://github.com/mpv-player/mpv
146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
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** Copyright (C) 2003 M. Bakker, Ahead Software AG, http://www.nero.com
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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**
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** Any non-GPL usage of this software or parts of this software is strictly
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** forbidden.
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**
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** Commercial non-GPL licensing of this software is possible.
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** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
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**
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** $Id: fixed.h,v 1.1 2003/08/30 22:30:21 arpi Exp $
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**/
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#ifndef __FIXED_H__
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#define __FIXED_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define COEF_BITS 28
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#define COEF_PRECISION (1 << COEF_BITS)
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#define REAL_BITS 14 // MAXIMUM OF 14 FOR FIXED POINT SBR
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#define REAL_PRECISION (1 << REAL_BITS)
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typedef int32_t real_t;
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#define REAL_CONST(A) ((real_t)((A)*(REAL_PRECISION)))
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#define COEF_CONST(A) ((real_t)((A)*(COEF_PRECISION)))
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#if defined(_WIN32) && !defined(_WIN32_WCE)
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/* multiply real with real */
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static INLINE MUL(real_t A, real_t B)
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{
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_asm {
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mov eax,A
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imul B
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#if 0
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shrd eax,edx,REAL_BITS
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#else
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shr eax,REAL_BITS
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shl edx,(32-REAL_BITS)
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or eax,edx
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#endif
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}
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}
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/* multiply coef with coef */
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static INLINE MUL_C_C(real_t A, real_t B)
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{
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_asm {
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mov eax,A
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imul B
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#if 0
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shrd eax,edx,COEF_BITS
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#else
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shr eax,COEF_BITS
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shl edx,(32-COEF_BITS)
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or eax,edx
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#endif
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}
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}
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/* multiply real with coef */
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static INLINE MUL_R_C(real_t A, real_t B)
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{
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_asm {
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mov eax,A
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imul B
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#if 0
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shrd eax,edx,COEF_BITS
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#else
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shr eax,COEF_BITS
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shl edx,(32-COEF_BITS)
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or eax,edx
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#endif
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}
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}
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#elif defined(__GNUC__) && defined (__arm__)
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/* taken from MAD */
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#define arm_mul(x, y, SCALEBITS) \
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({ uint32_t __hi; \
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uint32_t __lo; \
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uint32_t __result; \
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asm ("smull %0, %1, %3, %4\n\t" \
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"movs %0, %0, lsr %5\n\t" \
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"adc %2, %0, %1, lsl %6" \
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: "=&r" (__lo), "=&r" (__hi), "=r" (__result) \
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: "%r" (x), "r" (y), \
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"M" (SCALEBITS), "M" (32 - (SCALEBITS)) \
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: "cc"); \
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__result; \
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})
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static INLINE real_t MUL(real_t A, real_t B)
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{
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return arm_mul( A, B, REAL_BITS);
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}
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static INLINE real_t MUL_C_C(real_t A, real_t B)
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{
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return arm_mul( A, B, COEF_BITS);
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}
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static INLINE real_t MUL_R_C(real_t A, real_t B)
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{
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return arm_mul( A, B, COEF_BITS);
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}
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#else
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/* multiply real with real */
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#define MUL(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (REAL_BITS-1))) >> REAL_BITS)
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/* multiply coef with coef */
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#define MUL_C_C(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (COEF_BITS-1))) >> COEF_BITS)
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/* multiply real with coef */
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#define MUL_R_C(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (COEF_BITS-1))) >> COEF_BITS)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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