/* * *  Bluetooth low-complexity, subband codec (SBC) library * *  Copyright (C) 2004-2007  Marcel Holtmann <marcel@holtmann.org> *  Copyright (C) 2004-2005  Henryk Ploetz <henryk@ploetzli.ch> *  Copyright (C) 2005-2006  Brad Midgley <bmidgley@xmission.com> * * *  This library is free software; you can redistribute it and/or *  modify it under the terms of the GNU Lesser General Public *  License as published by the Free Software Foundation; either *  version 2.1 of the License, or (at your option) any later version. * *  This library 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 *  Lesser General Public License for more details. * *  You should have received a copy of the GNU Lesser General Public *  License along with this library; if not, write to the Free Software *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA * */#define fabs(x) ((x) < 0 ? -(x) : (x))/* C does not provide an explicit arithmetic shift right but this will   always be correct and every compiler *should* generate optimal code */#define ASR(val, bits) ((-2 >> 1 == -1) ? \		 ((int32_t)(val)) >> (bits) : ((int32_t) (val)) / (1 << (bits)))#define ASR_64(val, bits) ((-2 >> 1 == -1) ? \		 ((long long)(val)) >> (bits) : ((long long) (val)) / (1 << (bits)))#define SCALE_PROTO4_TBL	15#define SCALE_ANA4_TBL		16#define SCALE_PROTO8_TBL	15#define SCALE_ANA8_TBL		16#define SCALE_SPROTO4_TBL	16#define SCALE_SPROTO8_TBL	16#define SCALE_NPROTO4_TBL	10#define SCALE_NPROTO8_TBL	12#define SCALE_SAMPLES		14#define SCALE4_STAGE1_BITS	10 #define SCALE4_STAGE2_BITS	21 #define SCALE4_STAGED1_BITS	18#define SCALE4_STAGED2_BITS	23#define SCALE8_STAGE1_BITS	8#define SCALE8_STAGE2_BITS	24 #define SCALE8_STAGED1_BITS	18#define SCALE8_STAGED2_BITS	23 typedef int32_t sbc_fixed_t;typedef long long sbc_extended_t;#define SCALE4_STAGE1(src)  ASR_64(src, SCALE4_STAGE1_BITS)#define SCALE4_STAGE2(src)  ASR_64(src, SCALE4_STAGE2_BITS)#define SCALE4_STAGED1(src) ASR_64(src, SCALE4_STAGED1_BITS)#define SCALE4_STAGED2(src) ASR_64(src, SCALE4_STAGED2_BITS)#define SCALE8_STAGE1(src)  ASR_64(src, SCALE8_STAGE1_BITS)#define SCALE8_STAGE2(src)  ASR_64(src, SCALE8_STAGE2_BITS)#define SCALE8_STAGED1(src) ASR_64(src, SCALE8_STAGED1_BITS)#define SCALE8_STAGED2(src) ASR_64(src, SCALE8_STAGED2_BITS)#define SBC_FIXED_0(val) { val = 0; }#define ADD(dst, src)    { dst += src; }#define SUB(dst, src)    { dst -= src; }#define MUL(dst, a, b)   { dst = (sbc_fixed_t) a * b; }#define MULA(dst, a, b)  { dst += (sbc_extended_t) a * b; }#define DIV2(dst, src)   { dst = ASR(src, 1); }