[FFmpeg-cvslog] avutil/rational: Document what is to be expected from av_d2q() of doubles representing rational numbers
Michael Niedermayer
git at videolan.org
Sun Apr 14 20:34:15 EEST 2024
ffmpeg | branch: release/5.1 | Michael Niedermayer <michael at niedermayer.cc> | Wed Jan 31 02:37:57 2024 +0100| [311ff75a5911449577caff3f8647e4bfff251dcc] | committer: Michael Niedermayer
avutil/rational: Document what is to be expected from av_d2q() of doubles representing rational numbers
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit f465badb062c8023bc245f4878e7a6a082afc416)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=311ff75a5911449577caff3f8647e4bfff251dcc
---
libavutil/rational.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavutil/rational.h b/libavutil/rational.h
index cbb08a0baf..790f089527 100644
--- a/libavutil/rational.h
+++ b/libavutil/rational.h
@@ -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
* `{-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 max Maximum allowed numerator and denominator
* @return `d` in AVRational form
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