Diffstat (limited to 'core/multimedia/opieplayer/libmad/fixed.c') (more/less context) (show whitespace changes)
-rw-r--r-- | core/multimedia/opieplayer/libmad/fixed.c | 46 |
1 files changed, 45 insertions, 1 deletions
diff --git a/core/multimedia/opieplayer/libmad/fixed.c b/core/multimedia/opieplayer/libmad/fixed.c index af1e87e..e71418a 100644 --- a/core/multimedia/opieplayer/libmad/fixed.c +++ b/core/multimedia/opieplayer/libmad/fixed.c | |||
@@ -1,15 +1,15 @@ | |||
1 | /* | 1 | /* |
2 | * libmad - MPEG audio decoder library | 2 | * libmad - MPEG audio decoder library |
3 | * Copyright (C) 2000-2001 Robert Leslie | 3 | * Copyright (C) 2000-2004 Underbit Technologies, Inc. |
4 | * | 4 | * |
5 | * This program is free software; you can redistribute it and/or modify | 5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by | 6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or | 7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. | 8 | * (at your option) any later version. |
9 | * | 9 | * |
10 | * This program is distributed in the hope that it will be useful, | 10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. | 13 | * GNU General Public License for more details. |
14 | * | 14 | * |
15 | * You should have received a copy of the GNU General Public License | 15 | * You should have received a copy of the GNU General Public License |
@@ -26,12 +26,56 @@ | |||
26 | # include "libmad_global.h" | 26 | # include "libmad_global.h" |
27 | 27 | ||
28 | # include "fixed.h" | 28 | # include "fixed.h" |
29 | 29 | ||
30 | /* | 30 | /* |
31 | * NAME:fixed->abs() | 31 | * NAME:fixed->abs() |
32 | * DESCRIPTION:return absolute value of a fixed-point number | 32 | * DESCRIPTION:return absolute value of a fixed-point number |
33 | */ | 33 | */ |
34 | mad_fixed_t mad_f_abs(mad_fixed_t x) | 34 | mad_fixed_t mad_f_abs(mad_fixed_t x) |
35 | { | 35 | { |
36 | return x < 0 ? -x : x; | 36 | return x < 0 ? -x : x; |
37 | } | 37 | } |
38 | |||
39 | /* | ||
40 | * NAME:fixed->div() | ||
41 | * DESCRIPTION:perform division using fixed-point math | ||
42 | */ | ||
43 | mad_fixed_t mad_f_div(mad_fixed_t x, mad_fixed_t y) | ||
44 | { | ||
45 | mad_fixed_t q, r; | ||
46 | unsigned int bits; | ||
47 | |||
48 | q = mad_f_abs(x / y); | ||
49 | |||
50 | if (x < 0) { | ||
51 | x = -x; | ||
52 | y = -y; | ||
53 | } | ||
54 | |||
55 | r = x % y; | ||
56 | |||
57 | if (y < 0) { | ||
58 | x = -x; | ||
59 | y = -y; | ||
60 | } | ||
61 | |||
62 | if (q > mad_f_intpart(MAD_F_MAX) && | ||
63 | !(q == -mad_f_intpart(MAD_F_MIN) && r == 0 && (x < 0) != (y < 0))) | ||
64 | return 0; | ||
65 | |||
66 | for (bits = MAD_F_FRACBITS; bits && r; --bits) { | ||
67 | q <<= 1, r <<= 1; | ||
68 | if (r >= y) | ||
69 | r -= y, ++q; | ||
70 | } | ||
71 | |||
72 | /* round */ | ||
73 | if (2 * r >= y) | ||
74 | ++q; | ||
75 | |||
76 | /* fix sign */ | ||
77 | if ((x < 0) != (y < 0)) | ||
78 | q = -q; | ||
79 | |||
80 | return q << bits; | ||
81 | } | ||