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avutil/mathematics: add av_add_stable()

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-01-03 17:30:50 +01:00
parent de5b6c736b
commit b317f9459f
4 changed files with 32 additions and 1 deletions
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14
libavutil/mathematics.c
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@ -174,3 +174,17 @@ simple_round:
return av_rescale_q(this, fs_tb, out_tb);
}
int64_t av_add_stable(AVRational ts_tb, int64_t ts, AVRational inc_tb, int64_t inc)
{
AVRational step = av_mul_q(inc_tb, (AVRational) {inc, 1});
if (av_cmp_q(step, ts_tb) < 0) {
//increase step is too small for even 1 step to be representable
return ts;
} else {
int64_t old = av_rescale_q(ts, ts_tb, step);
int64_t old_ts = av_rescale_q(old, step, ts_tb);
return av_rescale_q(old + 1, step, ts_tb) + (ts - old_ts);
}
}