| /* |
| * |
| * Bluetooth low-complexity, subband codec (SBC) library |
| * |
| * Copyright (C) 2008-2010 Nokia Corporation |
| * Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org> |
| * Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch> |
| * Copyright (C) 2005-2008 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 SCALE_SPROTO4_TBL 12 |
| #define SCALE_SPROTO8_TBL 14 |
| #define SCALE_NPROTO4_TBL 11 |
| #define SCALE_NPROTO8_TBL 11 |
| #define SCALE4_STAGED1_BITS 15 |
| #define SCALE4_STAGED2_BITS 16 |
| #define SCALE8_STAGED1_BITS 15 |
| #define SCALE8_STAGED2_BITS 16 |
| |
| typedef int32_t sbc_fixed_t; |
| |
| #define SCALE4_STAGED1(src) ASR(src, SCALE4_STAGED1_BITS) |
| #define SCALE4_STAGED2(src) ASR(src, SCALE4_STAGED2_BITS) |
| #define SCALE8_STAGED1(src) ASR(src, SCALE8_STAGED1_BITS) |
| #define SCALE8_STAGED2(src) ASR(src, SCALE8_STAGED2_BITS) |
| |
| #define SBC_FIXED_0(val) { val = 0; } |
| #define MUL(a, b) ((a) * (b)) |
| #if defined(__arm__) && (!defined(__thumb__) || defined(__thumb2__)) |
| #define MULA(a, b, res) ({ \ |
| int tmp = res; \ |
| __asm__( \ |
| "mla %0, %2, %3, %0" \ |
| : "=&r" (tmp) \ |
| : "0" (tmp), "r" (a), "r" (b)); \ |
| tmp; }) |
| #else |
| #define MULA(a, b, res) ((a) * (b) + (res)) |
| #endif |