/* ** 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. ** **/ #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 FIX_CONST(A,PRECISION) (((A) >= 0) ? ((real_t)((A)*(PRECISION)+0.5)) : ((real_t)((A)*(PRECISION)-0.5))) #define REAL_CONST(A) FIX_CONST((A),(REAL_PRECISION)) #define COEF_CONST(A) FIX_CONST((A),(COEF_PRECISION)) #define FRAC_CONST(A) (((A) == 1.00) ? ((real_t)FRAC_MAX) : FIX_CONST((A),(FRAC_PRECISION))) //#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) FIX_CONST((A),(Q2_PRECISION)) #if defined(CPU_COLDFIRE) static INLINE real_t MUL_F(real_t A, real_t B) { asm volatile ( "mac.l %[A], %[B], %%acc0\n\t" "movclr.l %%acc0, %[A]" : [A] "+&r" (A) : [B] "r" (B) ); return A; } static INLINE real_t MUL_C(real_t A, real_t B) { asm volatile ( "mac.l %[A], %[B], %%acc0\n\t" "movclr.l %%acc0, %[A]\n\t" : [A] "+&d" (A) : [B] "r" (B) ); return A << 3; } /* MUL_R needs too many shifts for us to just operate on the top 32 bits the emac unit gives as usual, so we do a full 64 bit mul here. */ static INLINE real_t MUL_R(real_t x, real_t y) { real_t t1, t2; asm volatile ( "mac.l %[x],%[y],%%acc0\n" /* multiply */ "mulu.l %[y],%[x] \n" /* get lower half, avoid emac stall */ "movclr.l %%acc0,%[t1] \n" /* get higher half */ "moveq.l #17,%[t2] \n" "asl.l %[t2],%[t1] \n" /* hi <<= 17, plus one free */ "moveq.l #14,%[t2] \n" "lsr.l %[t2],%[x] \n" /* (unsigned)lo >>= 14 */ "or.l %[x],%[t1] \n" /* combine result */ : /* outputs */ [t1]"=&d"(t1), [t2]"=&d"(t2), [x] "+d" (x) : /* inputs */ [y] "d" (y) ); return t1; } static INLINE void ComplexMult(real_t *y1, real_t *y2, real_t x1, real_t x2, real_t c1, real_t c2) { asm volatile( "mac.l %[x1], %[c1], %%acc0\n\t" "mac.l %[x2], %[c2], %%acc0\n\t" "mac.l %[x2], %[c1], %%acc1\n\t" "msac.l %[x1], %[c2], %%acc1\n\t" "movclr.l %%acc0, %[x1]\n\t" "move.l %[x1], (%[y1])\n\t" "movclr.l %%acc1, %[x1]\n\t" "move.l %[x1], (%[y2])" : [x1] "+&r" (x1) : [x2] "r" (x2), [y1] "a" (y1), [y2] "a" (y2), [c1] "r" (c1), [c2] "r" (c2) : "memory" ); } /* the following see little or no use, so just ignore them for now */ #define MUL_Q2(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (Q2_BITS-1))) >> Q2_BITS) #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 _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 #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 #define MUL_Q2(A,B) (real_t)(((int64_t)(A)*(int64_t)(B)+(1 << (Q2_BITS-1))) >> Q2_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); } #endif #ifdef __cplusplus } #endif #endif