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+/*
+** 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 <cmnintrin.h>
+#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