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authorMohamed Tarek <mt@rockbox.org>2010-04-29 15:14:43 +0000
committerMohamed Tarek <mt@rockbox.org>2010-04-29 15:14:43 +0000
commit67f7ecf731d14f732db9d685aefd011f770d21a3 (patch)
tree680e77d8aeb617a9bec23629f20a35839e737f8c /apps/codecs/libwmapro/libavutil/mathematics.h
parentc740af20e70ddc863c3a71f3b25e51b2a20b6795 (diff)
downloadrockbox-67f7ecf731d14f732db9d685aefd011f770d21a3.tar.gz
rockbox-67f7ecf731d14f732db9d685aefd011f770d21a3.zip
Revert r25739 which added libwmapro to apps/codecs, in preparation to commit the unmodified ffmpeg files first, for the sake of a consistent/complete svn history.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25758 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/codecs/libwmapro/libavutil/mathematics.h')
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diff --git a/apps/codecs/libwmapro/libavutil/mathematics.h b/apps/codecs/libwmapro/libavutil/mathematics.h
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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 "attributes.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_LOG2_10
39#define M_LOG2_10 3.32192809488736234787 /* log_2 10 */
40#endif
41#ifndef M_PI
42#define M_PI 3.14159265358979323846 /* pi */
43#endif
44#ifndef M_SQRT1_2
45#define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */
46#endif
47#ifndef M_SQRT2
48#define M_SQRT2 1.41421356237309504880 /* sqrt(2) */
49#endif
50#ifndef NAN
51#define NAN (0.0/0.0)
52#endif
53#ifndef INFINITY
54#define INFINITY (1.0/0.0)
55#endif
56
57enum AVRounding {
58 AV_ROUND_ZERO = 0, ///< Round toward zero.
59 AV_ROUND_INF = 1, ///< Round away from zero.
60 AV_ROUND_DOWN = 2, ///< Round toward -infinity.
61 AV_ROUND_UP = 3, ///< Round toward +infinity.
62 AV_ROUND_NEAR_INF = 5, ///< Round to nearest and halfway cases away from zero.
63};
64
65/**
66 * Returns the greatest common divisor of a and b.
67 * If both a and b are 0 or either or both are <0 then behavior is
68 * undefined.
69 */
70int64_t av_const av_gcd(int64_t a, int64_t b);
71
72/**
73 * Rescales a 64-bit integer with rounding to nearest.
74 * A simple a*b/c isn't possible as it can overflow.
75 */
76int64_t av_rescale(int64_t a, int64_t b, int64_t c) av_const;
77
78/**
79 * Rescales a 64-bit integer with specified rounding.
80 * A simple a*b/c isn't possible as it can overflow.
81 */
82int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_const;
83
84/**
85 * Rescales a 64-bit integer by 2 rational numbers.
86 */
87//int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const;
88
89/**
90 * Compares 2 timestamps each in its own timebases.
91 * The result of the function is undefined if one of the timestamps
92 * is outside the int64_t range when represented in the others timebase.
93 * @return -1 if ts_a is before ts_b, 1 if ts_a is after ts_b or 0 if they represent the same position
94 */
95//int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b);
96
97
98#endif /* AVUTIL_MATHEMATICS_H */