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av_add_stable: Add fast special case where step can be represented exactly

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-06-02 19:00:18 +02:00
parent 4956d0e5a6
commit e9add0d85b
1 changed files with 8 additions and 0 deletions
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8
libavutil/mathematics.c
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@ -188,9 +188,17 @@ simple_round:
int64_t av_add_stable(AVRational ts_tb, int64_t ts, AVRational inc_tb, int64_t inc)
{
int64_t m, d;
if (inc != 1)
inc_tb = av_mul_q(inc_tb, (AVRational) {inc, 1});
m = inc_tb.num * (int64_t)ts_tb.den;
d = inc_tb.den * (int64_t)ts_tb.num;
if (m % d == 0)
return ts + m / d;
if (av_cmp_q(inc_tb, ts_tb) < 0) {
//increase step is too small for even 1 step to be representable
return ts;