| /* |
| * |
| * 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); } |