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| 1 /* | |
| 2 * copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at> | |
| 3 * | |
| 4 * This file is part of FFmpeg. | |
| 5 * | |
| 6 * FFmpeg is free software; you can redistribute it and/or | |
| 7 * modify it under the terms of the GNU Lesser General Public | |
| 8 * License as published by the Free Software Foundation; either | |
| 9 * version 2.1 of the License, or (at your option) any later version. | |
| 10 * | |
| 11 * FFmpeg is distributed in the hope that it will be useful, | |
| 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 * Lesser General Public License for more details. | |
| 15 * | |
| 16 * You should have received a copy of the GNU Lesser General Public | |
| 17 * License along with FFmpeg; if not, write to the Free Software | |
| 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 19 */ | |
| 20 | |
| 21 #ifndef AVUTIL_MATHEMATICS_H | |
| 22 #define AVUTIL_MATHEMATICS_H | |
| 23 | |
| 24 #include <stdint.h> | |
| 25 #include <math.h> | |
| 26 #include "common.h" | |
| 27 #include "rational.h" | |
| 28 | |
| 29 #ifndef M_E | |
| 30 #define M_E 2.7182818284590452354 /* e */ | |
| 31 #endif | |
| 32 #ifndef M_LN2 | |
| 33 #define M_LN2 0.69314718055994530942 /* log_e 2 */ | |
| 34 #endif | |
| 35 #ifndef M_LN10 | |
| 36 #define M_LN10 2.30258509299404568402 /* log_e 10 */ | |
| 37 #endif | |
| 38 #ifndef M_PI | |
| 39 #define M_PI 3.14159265358979323846 /* pi */ | |
| 40 #endif | |
| 41 #ifndef M_SQRT1_2 | |
| 42 #define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */ | |
| 43 #endif | |
| 44 | |
| 45 enum AVRounding { | |
| 46 AV_ROUND_ZERO = 0, ///< Round toward zero. | |
| 47 AV_ROUND_INF = 1, ///< Round away from zero. | |
| 48 AV_ROUND_DOWN = 2, ///< Round toward -infinity. | |
| 49 AV_ROUND_UP = 3, ///< Round toward +infinity. | |
| 50 AV_ROUND_NEAR_INF = 5, ///< Round to nearest and halfway cases away from zer
o. | |
| 51 }; | |
| 52 | |
| 53 int64_t av_const av_gcd(int64_t a, int64_t b); | |
| 54 | |
| 55 /** | |
| 56 * Rescales a 64-bit integer with rounding to nearest. | |
| 57 * A simple a*b/c isn't possible as it can overflow. | |
| 58 */ | |
| 59 int64_t av_rescale(int64_t a, int64_t b, int64_t c) av_const; | |
| 60 | |
| 61 /** | |
| 62 * Rescales a 64-bit integer with specified rounding. | |
| 63 * A simple a*b/c isn't possible as it can overflow. | |
| 64 */ | |
| 65 int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_cons
t; | |
| 66 | |
| 67 /** | |
| 68 * Rescales a 64-bit integer by 2 rational numbers. | |
| 69 */ | |
| 70 int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const; | |
| 71 | |
| 72 #endif /* AVUTIL_MATHEMATICS_H */ | |
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Chromium Code Reviews
Issue 909002:
Removed custom FFmpegLock. Removed ffmpeg headers from third_party/ffmpeg/include. (Closed)
