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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) 2005-2008 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_extended_t) (a) * (b); }
#define DIV2(dst, src) { dst = ASR(src, 1); }
#ifdef __arm__
#define MULA(res, a, b) __asm__( \
"smlal %Q0, %R0, %2, %3" \
: "=&r" (res) \
: "0" (res), "r" (a), "r" (b));
#else
#define MULA(dst, a, b) { dst += (sbc_extended_t) (a) * (b); }
#endif
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