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utils: avoid dividing by zero when multiplying y/z by 0/x

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The gcd of 0/x is 0, and this is then used as a denominator.
This commit is contained in:
Vincent Penquerc'h 2014-04-09 16:40:27 +01:00
parent 414f21d160
commit 3004cc5f45
1 changed files with 7 additions and 0 deletions
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7
gst/gstutils.c
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@ -3422,6 +3422,13 @@ gst_util_fraction_multiply (gint a_n, gint a_d, gint b_n, gint b_d,
g_return_val_if_fail (a_d != 0, FALSE);
g_return_val_if_fail (b_d != 0, FALSE);
/* early out if either is 0, as its gcd would be 0 */
if (a_n == 0 || b_n == 0) {
*res_n = 0;
*res_d = 1;
return TRUE;
}
gcd = gst_util_greatest_common_divisor (a_n, a_d);
a_n /= gcd;
a_d /= gcd;