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path: root/core/multimedia/opieplayer/libmad/fixed.c
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-rw-r--r--core/multimedia/opieplayer/libmad/fixed.c46
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
@@ -1,6 +1,6 @@
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
@@ -35,3 +35,47 @@ 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 */
43mad_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}