3 * Bluetooth low-complexity, subband codec (SBC) library
5 * Copyright (C) 2008-2010 Nokia Corporation
6 * Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
7 * Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch>
8 * Copyright (C) 2005-2008 Brad Midgley <bmidgley@xmission.com>
11 * This library is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this library; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
27 #define fabs(x) ((x) < 0 ? -(x) : (x))
28 /* C does not provide an explicit arithmetic shift right but this will
29 always be correct and every compiler *should* generate optimal code */
30 #define ASR(val, bits) ((-2 >> 1 == -1) ? \
31 ((int32_t)(val)) >> (bits) : ((int32_t) (val)) / (1 << (bits)))
33 #define SCALE_SPROTO4_TBL 12
34 #define SCALE_SPROTO8_TBL 14
35 #define SCALE_NPROTO4_TBL 11
36 #define SCALE_NPROTO8_TBL 11
37 #define SCALE4_STAGED1_BITS 15
38 #define SCALE4_STAGED2_BITS 16
39 #define SCALE8_STAGED1_BITS 15
40 #define SCALE8_STAGED2_BITS 16
42 typedef int32_t sbc_fixed_t;
44 #define SCALE4_STAGED1(src) ASR(src, SCALE4_STAGED1_BITS)
45 #define SCALE4_STAGED2(src) ASR(src, SCALE4_STAGED2_BITS)
46 #define SCALE8_STAGED1(src) ASR(src, SCALE8_STAGED1_BITS)
47 #define SCALE8_STAGED2(src) ASR(src, SCALE8_STAGED2_BITS)
49 #define SBC_FIXED_0(val) { val = 0; }
50 #define MUL(a, b) ((a) * (b))
51 #if defined(__arm__) && (!defined(__thumb__) || defined(__thumb2__))
52 #define MULA(a, b, res) ({ \
55 "mla %0, %2, %3, %0" \
57 : "0" (tmp), "r" (a), "r" (b)); \
60 #define MULA(a, b, res) ((a) * (b) + (res))