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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 */ |