blob: 6f4a5f4c607bf3a7e9d2b9923c4548d4e54860fa
| 1 | /* |
| 2 | * simple math operations |
| 3 | * Copyright (c) 2001, 2002 Fabrice Bellard |
| 4 | * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2.1 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | #ifndef AVCODEC_MATHOPS_H |
| 23 | #define AVCODEC_MATHOPS_H |
| 24 | |
| 25 | #include "common.h" |
| 26 | #include "internal.h" |
| 27 | |
| 28 | /* generic implementation */ |
| 29 | |
| 30 | #ifndef MULL |
| 31 | # define MULL(a,b,s) (((int64_t)(a) * (int64_t)(b)) >> (s)) |
| 32 | #endif |
| 33 | |
| 34 | #ifndef MULH |
| 35 | //gcc 3.4 creates an incredibly bloated mess out of this |
| 36 | //# define MULH(a,b) (((int64_t)(a) * (int64_t)(b))>>32) |
| 37 | |
| 38 | static av_always_inline int MULH(int a, int b) |
| 39 | { |
| 40 | return ((int64_t)(a) * (int64_t)(b)) >> 32; |
| 41 | } |
| 42 | #endif |
| 43 | |
| 44 | #ifndef MUL64 |
| 45 | # define MUL64(a,b) ((int64_t)(a) * (int64_t)(b)) |
| 46 | #endif |
| 47 | |
| 48 | #ifndef MAC64 |
| 49 | # define MAC64(d, a, b) ((d) += MUL64(a, b)) |
| 50 | #endif |
| 51 | |
| 52 | #ifndef MLS64 |
| 53 | # define MLS64(d, a, b) ((d) -= MUL64(a, b)) |
| 54 | #endif |
| 55 | |
| 56 | /* signed 16x16 -> 32 multiply add accumulate */ |
| 57 | #ifndef MAC16 |
| 58 | # define MAC16(rt, ra, rb) rt += (ra) * (rb) |
| 59 | #endif |
| 60 | |
| 61 | /* signed 16x16 -> 32 multiply */ |
| 62 | #ifndef MUL16 |
| 63 | # define MUL16(ra, rb) ((ra) * (rb)) |
| 64 | #endif |
| 65 | |
| 66 | #ifndef MLS16 |
| 67 | # define MLS16(rt, ra, rb) ((rt) -= (ra) * (rb)) |
| 68 | #endif |
| 69 | |
| 70 | #ifndef sign_extend |
| 71 | static inline av_const int sign_extend(int val, unsigned bits) |
| 72 | { |
| 73 | return (val << (INT_BIT - bits)) >> (INT_BIT - bits); |
| 74 | } |
| 75 | #endif |
| 76 | |
| 77 | #endif /* AVCODEC_MATHOPS_H */ |
| 78 | |
| 79 |