integer.h
资源名称:X264CODEC.rar [点击查看]
上传用户:lctgjx
上传日期:2022-06-04
资源大小:8887k
文件大小:2k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*
- * arbitrary precision integers
- * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- /**
- * @file integer.h
- * arbitrary precision integers
- * @author Michael Niedermayer <michaelni@gmx.at>
- */
- #ifndef FFMPEG_INTEGER_H
- #define FFMPEG_INTEGER_H
- #include "common.h"
- #define AV_INTEGER_SIZE 8
- typedef struct AVInteger{
- uint16_t v[AV_INTEGER_SIZE];
- } AVInteger;
- AVInteger av_add_i(AVInteger a, AVInteger b) av_const;
- AVInteger av_sub_i(AVInteger a, AVInteger b) av_const;
- /**
- * returns the rounded down value of the logarithm of base 2 of the given AVInteger.
- * this is simply the index of the most significant bit which is 1. Or 0 of all bits are 0
- */
- int av_log2_i(AVInteger a) av_const;
- AVInteger av_mul_i(AVInteger a, AVInteger b) av_const;
- /**
- * returns 0 if a==b, 1 if a>b and -1 if a<b.
- */
- int av_cmp_i(AVInteger a, AVInteger b) av_const;
- /**
- * bitwise shift.
- * @param s the number of bits by which the value should be shifted right, may be negative for shifting left
- */
- AVInteger av_shr_i(AVInteger a, int s) av_const;
- /**
- * returns a % b.
- * @param quot a/b will be stored here
- */
- AVInteger av_mod_i(AVInteger *quot, AVInteger a, AVInteger b);
- /**
- * returns a/b.
- */
- AVInteger av_div_i(AVInteger a, AVInteger b) av_const;
- /**
- * converts the given int64_t to an AVInteger.
- */
- AVInteger av_int2i(int64_t a) av_const;
- /**
- * converts the given AVInteger to an int64_t.
- * if the AVInteger is too large to fit into an int64_t,
- * then only the least significant 64bit will be used
- */
- int64_t av_i2int(AVInteger a) av_const;
- #endif /* FFMPEG_INTEGER_H */