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avutil/rational: Document what is to be expected from av_d2q() of doubles representing rational numbers

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2024-01-31 02:37:57 +01:00
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libavutil/rational.h
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@ -168,6 +168,10 @@ static av_always_inline AVRational av_inv_q(AVRational q)
* In case of infinity, the returned value is expressed as `{1, 0}` or * In case of infinity, the returned value is expressed as `{1, 0}` or
* `{-1, 0}` depending on the sign. * `{-1, 0}` depending on the sign.
* *
* In general rational numbers with |num| <= 1<<26 && |den| <= 1<<26
* can be recovered exactly from their double representation.
* (no exceptions were found within 1B random ones)
*
* @param d `double` to convert * @param d `double` to convert
* @param max Maximum allowed numerator and denominator * @param max Maximum allowed numerator and denominator
* @return `d` in AVRational form * @return `d` in AVRational form