diff options
Diffstat (limited to 'sbc/sbc_math.h')
-rw-r--r-- | sbc/sbc_math.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/sbc/sbc_math.h b/sbc/sbc_math.h new file mode 100644 index 00000000..c427bee3 --- /dev/null +++ b/sbc/sbc_math.h @@ -0,0 +1,65 @@ +/* + * + * Bluetooth low-complexity, subband codec (SBC) library + * + * Copyright (C) 2004-2007 Marcel Holtmann <marcel@holtmann.org> + * + * + * 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_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 16 +#define SCALE4_STAGE2_BITS 18 +#define SCALE4_STAGED1_BITS 15 +#define SCALE4_STAGED2_BITS 15 +#define SCALE8_STAGE1_BITS 16 +#define SCALE8_STAGE2_BITS 18 +#define SCALE8_STAGED1_BITS 15 +#define SCALE8_STAGED2_BITS 15 + +typedef int32_t sbc_fixed_t; + +#define SCALE4_STAGE1(src) ASR(src, SCALE4_STAGE1_BITS) +#define SCALE4_STAGE2(src) ASR(src, SCALE4_STAGE2_BITS) +#define SCALE4_STAGED1(src) ASR(src, SCALE4_STAGED1_BITS) +#define SCALE4_STAGED2(src) ASR(src, SCALE4_STAGED2_BITS) +#define SCALE8_STAGE1(src) ASR(src, SCALE8_STAGE1_BITS) +#define SCALE8_STAGE2(src) ASR(src, SCALE8_STAGE2_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 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_fixed_t) a * b; } +#define DIV2(dst, src) { dst = ASR(src, 1); } |