mirror of
https://git.kernel.org/pub/scm/bluetooth/bluez.git
synced 2024-12-06 02:24:25 +08:00
ad868bd413
I also tagged the sbc project with "copied-to-bluez-utils" at the same time. We will do sbc work under bluez and sync it with the old sbc project if necessary.
70 lines
2.7 KiB
C
70 lines
2.7 KiB
C
/*
|
|
*
|
|
* 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); }
|