1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/*
*
* Bluetooth low-complexity, subband codec (SBC) library
*
* Copyright (C) 2004-2006 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); }
|
