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Diffstat (limited to 'src/modules/bluetooth/sbc_math.h')
| -rw-r--r-- | src/modules/bluetooth/sbc_math.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/modules/bluetooth/sbc_math.h b/src/modules/bluetooth/sbc_math.h new file mode 100644 index 00000000..b3d87a62 --- /dev/null +++ b/src/modules/bluetooth/sbc_math.h @@ -0,0 +1,72 @@ +/* + * + * Bluetooth low-complexity, subband codec (SBC) library + * + * Copyright (C) 2004-2008 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_PROTO4_TBL 15 +#define SCALE_ANA4_TBL 17 +#define SCALE_PROTO8_TBL 16 +#define SCALE_ANA8_TBL 17 +#define SCALE_SPROTO4_TBL 12 +#define SCALE_SPROTO8_TBL 14 +#define SCALE_NPROTO4_TBL 11 +#define SCALE_NPROTO8_TBL 11 +#define SCALE4_STAGE1_BITS 15 +#define SCALE4_STAGE2_BITS 16 +#define SCALE4_STAGED1_BITS 15 +#define SCALE4_STAGED2_BITS 16 +#define SCALE8_STAGE1_BITS 15 +#define SCALE8_STAGE2_BITS 15 +#define SCALE8_STAGED1_BITS 15 +#define SCALE8_STAGED2_BITS 16 + +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 MUL(a, b) ((a) * (b)) +#ifdef __arm__ +#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 |