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avformat/utils: Don't compare pointers when sorting chapters

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The chapters are independently allocated, so that comparing
the pointers is undefined behaviour. Furthermore, its result
is not platform-independent (and may not even be deterministic
on a particular platform). So compare the chapters' ids instead.
(avpriv_new_chapter() ensures that there are no duplicate ids.)

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-08-27 13:17:09 +02:00
parent 6e0823ab83
commit e04ddba64f
1 changed files with 1 additions and 1 deletions
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2
libavformat/utils.c
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@ -3160,7 +3160,7 @@ static int chapter_start_cmp(const void *p1, const void *p2)
int delta = av_compare_ts(ch1->start, ch1->time_base, ch2->start, ch2->time_base);
if (delta)
return delta;
return (ch1 > ch2) - (ch1 < ch2);
return FFDIFFSIGN(ch1->id, ch2->id);
}
static int compute_chapters_end(AVFormatContext *s)