• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /*
2  *
3  *  Bluetooth low-complexity, subband codec (SBC) library
4  *
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>
9  *
10  *
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.
15  *
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.
20  *
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
24  *
25  */
26 
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)))
32 
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
41 
42 typedef int32_t sbc_fixed_t;
43 
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)
48 
49 #define SBC_FIXED_0(val) { val = 0; }
50 #define MUL(a, b)        ((a) * (b))
51 #ifdef __arm__
52 #define MULA(a, b, res) ({				\
53 		int tmp = res;			\
54 		__asm__(				\
55 			"mla %0, %2, %3, %0"		\
56 			: "=&r" (tmp)			\
57 			: "0" (tmp), "r" (a), "r" (b));	\
58 		tmp; })
59 #else
60 #define MULA(a, b, res)  ((a) * (b) + (res))
61 #endif
62