1 /* 2 * 3 * Bluetooth low-complexity, subband codec (SBC) library 4 * 5 * Copyright (C) 2004-2009 Marcel Holtmann <marcel@holtmann.org> 6 * Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch> 7 * Copyright (C) 2005-2008 Brad Midgley <bmidgley@xmission.com> 8 * 9 * 10 * This library is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU Lesser General Public 12 * License as published by the Free Software Foundation; either 13 * version 2.1 of the License, or (at your option) any later version. 14 * 15 * This library is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with this library; if not, write to the Free Software 22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 23 * 24 */ 25 26 #define fabs(x) ((x) < 0 ? -(x) : (x)) 27 /* C does not provide an explicit arithmetic shift right but this will 28 always be correct and every compiler *should* generate optimal code */ 29 #define ASR(val, bits) ((-2 >> 1 == -1) ? \ 30 ((int32_t)(val)) >> (bits) : ((int32_t) (val)) / (1 << (bits))) 31 32 #define SCALE_SPROTO4_TBL 12 33 #define SCALE_SPROTO8_TBL 14 34 #define SCALE_NPROTO4_TBL 11 35 #define SCALE_NPROTO8_TBL 11 36 #define SCALE4_STAGED1_BITS 15 37 #define SCALE4_STAGED2_BITS 16 38 #define SCALE8_STAGED1_BITS 15 39 #define SCALE8_STAGED2_BITS 16 40 41 typedef int32_t sbc_fixed_t; 42 43 #define SCALE4_STAGED1(src) ASR(src, SCALE4_STAGED1_BITS) 44 #define SCALE4_STAGED2(src) ASR(src, SCALE4_STAGED2_BITS) 45 #define SCALE8_STAGED1(src) ASR(src, SCALE8_STAGED1_BITS) 46 #define SCALE8_STAGED2(src) ASR(src, SCALE8_STAGED2_BITS) 47 48 #define SBC_FIXED_0(val) { val = 0; } 49 #define MUL(a, b) ((a) * (b)) 50 #ifdef __arm__ 51 #define MULA(a, b, res) ({ \ 52 int tmp = res; \ 53 __asm__( \ 54 "mla %0, %2, %3, %0" \ 55 : "=&r" (tmp) \ 56 : "0" (tmp), "r" (a), "r" (b)); \ 57 tmp; }) 58 #else 59 #define MULA(a, b, res) ((a) * (b) + (res)) 60 #endif 61