?? sbc_math.h
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/* * * 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); }
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