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libavutil/mathematics.h

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00001 /*
00002  * copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #ifndef AVUTIL_MATHEMATICS_H
00022 #define AVUTIL_MATHEMATICS_H
00023 
00024 #include <stdint.h>
00025 #include <math.h>
00026 #include "attributes.h"
00027 #include "rational.h"
00028 
00029 #ifndef M_E
00030 #define M_E            2.7182818284590452354   /* e */
00031 #endif
00032 #ifndef M_LN2
00033 #define M_LN2          0.69314718055994530942  /* log_e 2 */
00034 #endif
00035 #ifndef M_LN10
00036 #define M_LN10         2.30258509299404568402  /* log_e 10 */
00037 #endif
00038 #ifndef M_LOG2_10
00039 #define M_LOG2_10      3.32192809488736234787  /* log_2 10 */
00040 #endif
00041 #ifndef M_PI
00042 #define M_PI           3.14159265358979323846  /* pi */
00043 #endif
00044 #ifndef M_SQRT1_2
00045 #define M_SQRT1_2      0.70710678118654752440  /* 1/sqrt(2) */
00046 #endif
00047 #ifndef M_SQRT2
00048 #define M_SQRT2        1.41421356237309504880  /* sqrt(2) */
00049 #endif
00050 #ifndef NAN
00051 #define NAN            (0.0/0.0)
00052 #endif
00053 #ifndef INFINITY
00054 #define INFINITY       (1.0/0.0)
00055 #endif
00056 
00057 enum AVRounding {
00058     AV_ROUND_ZERO     = 0, 
00059     AV_ROUND_INF      = 1, 
00060     AV_ROUND_DOWN     = 2, 
00061     AV_ROUND_UP       = 3, 
00062     AV_ROUND_NEAR_INF = 5, 
00063 };
00064 
00070 int64_t av_const av_gcd(int64_t a, int64_t b);
00071 
00076 int64_t av_rescale(int64_t a, int64_t b, int64_t c) av_const;
00077 
00082 int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_const;
00083 
00087 int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const;
00088 
00095 int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b);
00096 
00097 
00098 #endif /* AVUTIL_MATHEMATICS_H */

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