repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * arbitrary precision integers | |
| 3 | * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at> | |
| 4 | * | |
| 5 | * This file is part of FFmpeg. | |
| 6 | * | |
| 7 | * FFmpeg is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU Lesser General Public | |
| 9 | * License as published by the Free Software Foundation; either | |
| 10 | * version 2.1 of the License, or (at your option) any later version. | |
| 11 | * | |
| 12 | * FFmpeg is distributed in the hope that it will be useful, | |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 | * Lesser General Public License for more details. | |
| 16 | * | |
| 17 | * You should have received a copy of the GNU Lesser General Public | |
| 18 | * License along with FFmpeg; if not, write to the Free Software | |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 20 | */ | |
| 21 | ||
| 22 | /** | |
| 23 | * @file | |
| 24 | * arbitrary precision integers | |
| 25 | * @author Michael Niedermayer <michaelni@gmx.at> | |
| 26 | */ | |
| 27 | ||
| 28 | #ifndef AVUTIL_INTEGER_H | |
| 29 | #define AVUTIL_INTEGER_H | |
| 30 | ||
| 31 | #include <stdint.h> | |
| 32 | #include "common.h" | |
| 33 | ||
| 34 | #define AV_INTEGER_SIZE 8 | |
| 35 | ||
| 36 | typedef struct AVInteger{ | |
| 37 | uint16_t v[AV_INTEGER_SIZE]; | |
| 38 | } AVInteger; | |
| 39 | ||
| 40 | AVInteger av_add_i(AVInteger a, AVInteger b) av_const; | |
| 41 | AVInteger av_sub_i(AVInteger a, AVInteger b) av_const; | |
| 42 | ||
| 43 | /** | |
| 44 | * Return the rounded-down value of the base 2 logarithm of the given | |
| 45 | * AVInteger. This is simply the index of the most significant bit | |
| 46 | * which is 1, or 0 if all bits are 0. | |
| 47 | */ | |
| 48 | int av_log2_i(AVInteger a) av_const; | |
| 49 | AVInteger av_mul_i(AVInteger a, AVInteger b) av_const; | |
| 50 | ||
| 51 | /** | |
| 52 | * Return 0 if a==b, 1 if a>b and -1 if a<b. | |
| 53 | */ | |
| 54 | int av_cmp_i(AVInteger a, AVInteger b) av_const; | |
| 55 | ||
| 56 | /** | |
| 57 | * bitwise shift | |
| 58 | * @param s the number of bits by which the value should be shifted right, | |
| 59 | may be negative for shifting left | |
| 60 | */ | |
| 61 | AVInteger av_shr_i(AVInteger a, int s) av_const; | |
| 62 | ||
| 63 | /** | |
| 64 | * Return a % b. | |
| 65 | * @param quot a/b will be stored here. | |
| 66 | */ | |
| 67 | AVInteger av_mod_i(AVInteger *quot, AVInteger a, AVInteger b); | |
| 68 | ||
| 69 | /** | |
| 70 | * Return a/b. | |
| 71 | */ | |
| 72 | AVInteger av_div_i(AVInteger a, AVInteger b) av_const; | |
| 73 | ||
| 74 | /** | |
| 75 | * Convert the given int64_t to an AVInteger. | |
| 76 | */ | |
| 77 | AVInteger av_int2i(int64_t a) av_const; | |
| 78 | ||
| 79 | /** | |
| 80 | * Convert the given AVInteger to an int64_t. | |
| 81 | * If the AVInteger is too large to fit into an int64_t, | |
| 82 | * then only the least significant 64 bits will be used. | |
| 83 | */ | |
| 84 | int64_t av_i2int(AVInteger a) av_const; | |
| 85 | ||
| 86 | #endif /* AVUTIL_INTEGER_H */ |