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https://git.kernel.org/pub/scm/bluetooth/bluez.git
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9e31e7dde6
Added SIMD-friendly C implementation of SBC analysis filter (the structure of code had to be changed a bit and constants in the tables reordered). This code can be used as a reference for developing platform specific SIMD optimizations. These functions are put into a new file 'sbc_primitives.c', which is going to contain all the basic stuff for SBC codec.
61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
/*
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*
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* Bluetooth low-complexity, subband codec (SBC) library
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*
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* Copyright (C) 2004-2009 Marcel Holtmann <marcel@holtmann.org>
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* Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch>
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* Copyright (C) 2005-2008 Brad Midgley <bmidgley@xmission.com>
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*
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#define fabs(x) ((x) < 0 ? -(x) : (x))
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/* C does not provide an explicit arithmetic shift right but this will
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always be correct and every compiler *should* generate optimal code */
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#define ASR(val, bits) ((-2 >> 1 == -1) ? \
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((int32_t)(val)) >> (bits) : ((int32_t) (val)) / (1 << (bits)))
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#define SCALE_SPROTO4_TBL 12
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#define SCALE_SPROTO8_TBL 14
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#define SCALE_NPROTO4_TBL 11
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#define SCALE_NPROTO8_TBL 11
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#define SCALE4_STAGED1_BITS 15
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#define SCALE4_STAGED2_BITS 16
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#define SCALE8_STAGED1_BITS 15
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#define SCALE8_STAGED2_BITS 16
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typedef int32_t sbc_fixed_t;
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#define SCALE4_STAGED1(src) ASR(src, SCALE4_STAGED1_BITS)
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#define SCALE4_STAGED2(src) ASR(src, SCALE4_STAGED2_BITS)
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#define SCALE8_STAGED1(src) ASR(src, SCALE8_STAGED1_BITS)
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#define SCALE8_STAGED2(src) ASR(src, SCALE8_STAGED2_BITS)
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#define SBC_FIXED_0(val) { val = 0; }
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#define MUL(a, b) ((a) * (b))
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#ifdef __arm__
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#define MULA(a, b, res) ({ \
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int tmp = res; \
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__asm__( \
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"mla %0, %2, %3, %0" \
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: "=&r" (tmp) \
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: "0" (tmp), "r" (a), "r" (b)); \
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tmp; })
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#else
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#define MULA(a, b, res) ((a) * (b) + (res))
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#endif
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