code.delx.au - pulseaudio/blob - src/modules/bluetooth/sbc_math.h

   1 /*
   2  *
   3  *  Bluetooth low-complexity, subband codec (SBC) library
   4  *
   5  *  Copyright (C) 2004-2008  Marcel Holtmann <marcel@holtmann.org>
   6  *  Copyright (C) 2004-2005  Henryk Ploetz <henryk@ploetzli.ch>
   7  *  Copyright (C) 2005-2008  Brad Midgley <bmidgley@xmission.com>
   8  *
   9  *
  10  *  This library is free software; you can redistribute it and/or
  11  *  modify it under the terms of the GNU Lesser General Public
  12  *  License as published by the Free Software Foundation; either
  13  *  version 2.1 of the License, or (at your option) any later version.
  14  *
  15  *  This library is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  Lesser General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU Lesser General Public
  21  *  License along with this library; if not, write to the Free Software
  22  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  23  *
  24  */
  25
  26 #define fabs(x) ((x) < 0 ? -(x) : (x))
  27 /* C does not provide an explicit arithmetic shift right but this will
  28    always be correct and every compiler *should* generate optimal code */
  29 #define ASR(val, bits) ((-2 >> 1 == -1) ? \
  30                  ((int32_t)(val)) >> (bits) : ((int32_t) (val)) / (1 << (bits)))
  31
  32 #define SCALE_PROTO4_TBL        15
  33 #define SCALE_ANA4_TBL          17
  34 #define SCALE_PROTO8_TBL        16
  35 #define SCALE_ANA8_TBL          17
  36 #define SCALE_SPROTO4_TBL       12
  37 #define SCALE_SPROTO8_TBL       14
  38 #define SCALE_NPROTO4_TBL       11
  39 #define SCALE_NPROTO8_TBL       11
  40 #define SCALE4_STAGE1_BITS      15
  41 #define SCALE4_STAGE2_BITS      16
  42 #define SCALE4_STAGED1_BITS     15
  43 #define SCALE4_STAGED2_BITS     16
  44 #define SCALE8_STAGE1_BITS      15
  45 #define SCALE8_STAGE2_BITS      15
  46 #define SCALE8_STAGED1_BITS     15
  47 #define SCALE8_STAGED2_BITS     16
  48
  49 typedef int32_t sbc_fixed_t;
  50
  51 #define SCALE4_STAGE1(src)  ASR(src, SCALE4_STAGE1_BITS)
  52 #define SCALE4_STAGE2(src)  ASR(src, SCALE4_STAGE2_BITS)
  53 #define SCALE4_STAGED1(src) ASR(src, SCALE4_STAGED1_BITS)
  54 #define SCALE4_STAGED2(src) ASR(src, SCALE4_STAGED2_BITS)
  55 #define SCALE8_STAGE1(src)  ASR(src, SCALE8_STAGE1_BITS)
  56 #define SCALE8_STAGE2(src)  ASR(src, SCALE8_STAGE2_BITS)
  57 #define SCALE8_STAGED1(src) ASR(src, SCALE8_STAGED1_BITS)
  58 #define SCALE8_STAGED2(src) ASR(src, SCALE8_STAGED2_BITS)
  59
  60 #define SBC_FIXED_0(val) { val = 0; }
  61 #define MUL(a, b)        ((a) * (b))
  62 #ifdef __arm__
  63 #define MULA(a, b, res) ({                              \
  64                 int tmp = res;                  \
  65                 __asm__(                                \
  66                         "mla %0, %2, %3, %0"            \
  67                         : "=&r" (tmp)                   \
  68                         : "0" (tmp), "r" (a), "r" (b)); \
  69                 tmp; })
  70 #else
  71 #define MULA(a, b, res)  ((a) * (b) + (res))
  72 #endif