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avutil/rational: increase av_d2q precision

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Fixes parsing small timebases from expressions (where the expression API
converts the result to double), like in this command line:

ffprobe -f lavfi -i testsrc=d=1,settb=1/2000000000 -show_streams -show_entries stream=time_base

Before the patch timebase was parsed as 1/1999999999.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2024-01-26 01:42:13 +01:00
parent 976cf2343d
commit 8fccd6d510
1 changed files with 1 additions and 1 deletions
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libavutil/rational.c
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@ -114,7 +114,7 @@ AVRational av_d2q(double d, int max)
return (AVRational) { d < 0 ? -1 : 1, 0 };
frexp(d, &exponent);
exponent = FFMAX(exponent-1, 0);
den = 1LL << (61 - exponent);
den = 1LL << (62 - exponent);
// (int64_t)rint() and llrint() do not work with gcc on ia64 and sparc64,
// see Ticket2713 for affected gcc/glibc versions
av_reduce(&a.num, &a.den, floor(d * den + 0.5), den, max);