From cc2160de5cc05dc3aa77f3a34358e66f6193c8c9 Mon Sep 17 00:00:00 2001 From: Michał Cichoń Date: Tue, 26 Jun 2012 20:35:30 +0200 Subject: Add support for AAC. --- faad2/src/libfaad/fixed.h | 287 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 287 insertions(+) create mode 100644 faad2/src/libfaad/fixed.h (limited to 'faad2/src/libfaad/fixed.h') diff --git a/faad2/src/libfaad/fixed.h b/faad2/src/libfaad/fixed.h new file mode 100644 index 0000000..3a599ee --- /dev/null +++ b/faad2/src/libfaad/fixed.h @@ -0,0 +1,287 @@ +/* +** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding +** Copyright (C) 2003-2005 M. Bakker, Nero 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. +** +** The "appropriate copyright message" mentioned in section 2c of the GPLv2 +** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com" +** +** Commercial non-GPL licensing of this software is possible. +** For more info contact Nero AG through Mpeg4AAClicense@nero.com. +** +** $Id: fixed.h,v 1.32 2007/11/01 12:33:30 menno Exp $ +**/ + +#ifndef __FIXED_H__ +#define __FIXED_H__ + +#ifdef __cplusplus +extern "C" { +#endif + +#if defined(_WIN32_WCE) && defined(_ARM_) +#include +#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) ? ((real_t)((A)*(REAL_PRECISION)+0.5)) : ((real_t)((A)*(REAL_PRECISION)-0.5))) +#define COEF_CONST(A) (((A) >= 0) ? ((real_t)((A)*(COEF_PRECISION)+0.5)) : ((real_t)((A)*(COEF_PRECISION)-0.5))) +#define FRAC_CONST(A) (((A) == 1.00) ? ((real_t)FRAC_MAX) : (((A) >= 0) ? ((real_t)((A)*(FRAC_PRECISION)+0.5)) : ((real_t)((A)*(FRAC_PRECISION)-0.5)))) +//#define FRAC_CONST(A) (((A) >= 0) ? ((real_t)((A)*(FRAC_PRECISION)+0.5)) : ((real_t)((A)*(FRAC_PRECISION)-0.5))) + +#define Q2_BITS 22 +#define Q2_PRECISION (1 << Q2_BITS) +#define Q2_CONST(A) (((A) >= 0) ? ((real_t)((A)*(Q2_PRECISION)+0.5)) : ((real_t)((A)*(Q2_PRECISION)-0.5))) + +#if defined(_WIN32) && !defined(_WIN32_WCE) + +/* multiply with real shift */ +static INLINE real_t MUL_R(real_t A, real_t B) +{ + _asm { + mov eax,A + imul B + shrd eax,edx,REAL_BITS + } +} + +/* multiply with coef shift */ +static INLINE real_t MUL_C(real_t A, real_t B) +{ + _asm { + mov eax,A + imul B + shrd eax,edx,COEF_BITS + } +} + +static INLINE real_t MUL_Q2(real_t A, real_t B) +{ + _asm { + mov eax,A + imul B + shrd eax,edx,Q2_BITS + } +} + +static INLINE real_t MUL_SHIFT6(real_t A, real_t B) +{ + _asm { + mov eax,A + imul B + shrd eax,edx,6 + } +} + +static INLINE real_t MUL_SHIFT23(real_t A, real_t B) +{ + _asm { + mov eax,A + imul B + shrd eax,edx,23 + } +} + +#if 1 +static INLINE real_t _MulHigh(real_t A, real_t B) +{ + _asm { + mov eax,A + imul B + mov eax,edx + } +} + +/* multiply with fractional shift */ +static INLINE real_t MUL_F(real_t A, real_t B) +{ + return _MulHigh(A,B) << (FRAC_SIZE-FRAC_BITS); +} + +/* Complex multiplication */ +static INLINE void ComplexMult(real_t *y1, real_t *y2, + real_t x1, real_t x2, real_t c1, real_t c2) +{ + *y1 = (_MulHigh(x1, c1) + _MulHigh(x2, c2))<<(FRAC_SIZE-FRAC_BITS); + *y2 = (_MulHigh(x2, c1) - _MulHigh(x1, c2))<<(FRAC_SIZE-FRAC_BITS); +} +#else +static INLINE real_t MUL_F(real_t A, real_t B) +{ + _asm { + mov eax,A + imul B + shrd eax,edx,FRAC_BITS + } +} + +/* Complex multiplication */ +static INLINE void ComplexMult(real_t *y1, real_t *y2, + real_t x1, real_t x2, real_t c1, real_t c2) +{ + *y1 = MUL_F(x1, c1) + MUL_F(x2, c2); + *y2 = MUL_F(x2, c1) - MUL_F(x1, c2); +} +#endif + +#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_R(real_t A, real_t B) +{ + return arm_mul(A, B, REAL_BITS); +} + +static INLINE real_t MUL_C(real_t A, real_t B) +{ + return arm_mul(A, B, COEF_BITS); +} + +static INLINE real_t MUL_Q2(real_t A, real_t B) +{ + return arm_mul(A, B, Q2_BITS); +} + +static INLINE real_t MUL_SHIFT6(real_t A, real_t B) +{ + return arm_mul(A, B, 6); +} + +static INLINE real_t MUL_SHIFT23(real_t A, real_t B) +{ + return arm_mul(A, B, 23); +} + +static INLINE real_t _MulHigh(real_t x, real_t y) +{ + uint32_t __lo; + uint32_t __hi; + asm("smull\t%0, %1, %2, %3" + : "=&r"(__lo),"=&r"(__hi) + : "%r"(x),"r"(y) + : "cc"); + return __hi; +} + +static INLINE real_t MUL_F(real_t A, real_t B) +{ + return _MulHigh(A, B) << (FRAC_SIZE-FRAC_BITS); +} + +/* Complex multiplication */ +static INLINE void ComplexMult(real_t *y1, real_t *y2, + real_t x1, real_t x2, real_t c1, real_t c2) +{ + int32_t tmp, yt1, yt2; + asm("smull %0, %1, %4, %6\n\t" + "smlal %0, %1, %5, %7\n\t" + "rsb %3, %4, #0\n\t" + "smull %0, %2, %5, %6\n\t" + "smlal %0, %2, %3, %7" + : "=&r" (tmp), "=&r" (yt1), "=&r" (yt2), "=r" (x1) + : "3" (x1), "r" (x2), "r" (c1), "r" (c2) + : "cc" ); + *y1 = yt1 << (FRAC_SIZE-FRAC_BITS); + *y2 = yt2 << (FRAC_SIZE-FRAC_BITS); +} + +#else + + /* multiply with real shift */ + #define MUL_R(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (REAL_BITS-1))) >> REAL_BITS) + /* multiply with coef shift */ + #define MUL_C(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (COEF_BITS-1))) >> COEF_BITS) + /* multiply with fractional shift */ +#if defined(_WIN32_WCE) && defined(_ARM_) + /* eVC for PocketPC has an intrinsic function that returns only the high 32 bits of a 32x32 bit multiply */ + static INLINE real_t MUL_F(real_t A, real_t B) + { + return _MulHigh(A,B) << (32-FRAC_BITS); + } +#else +#ifdef __BFIN__ +#define _MulHigh(X,Y) ({ int __xxo; \ + asm ( \ + "a1 = %2.H * %1.L (IS,M);\n\t" \ + "a0 = %1.H * %2.H, a1+= %1.H * %2.L (IS,M);\n\t"\ + "a1 = a1 >>> 16;\n\t" \ + "%0 = (a0 += a1);\n\t" \ + : "=d" (__xxo) : "d" (X), "d" (Y) : "A0","A1"); __xxo; }) + +#define MUL_F(X,Y) ({ int __xxo; \ + asm ( \ + "a1 = %2.H * %1.L (M);\n\t" \ + "a0 = %1.H * %2.H, a1+= %1.H * %2.L (M);\n\t" \ + "a1 = a1 >>> 16;\n\t" \ + "%0 = (a0 += a1);\n\t" \ + : "=d" (__xxo) : "d" (X), "d" (Y) : "A0","A1"); __xxo; }) +#else + #define _MulHigh(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (FRAC_SIZE-1))) >> FRAC_SIZE) + #define MUL_F(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (FRAC_BITS-1))) >> FRAC_BITS) +#endif +#endif + #define MUL_Q2(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (Q2_BITS-1))) >> Q2_BITS) + #define MUL_SHIFT6(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (6-1))) >> 6) + #define MUL_SHIFT23(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (23-1))) >> 23) + +/* Complex multiplication */ +static INLINE void ComplexMult(real_t *y1, real_t *y2, + real_t x1, real_t x2, real_t c1, real_t c2) +{ + *y1 = (_MulHigh(x1, c1) + _MulHigh(x2, c2))<<(FRAC_SIZE-FRAC_BITS); + *y2 = (_MulHigh(x2, c1) - _MulHigh(x1, c2))<<(FRAC_SIZE-FRAC_BITS); +} + +#endif + + + +#ifdef __cplusplus +} +#endif +#endif -- cgit v1.2.3