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avfilter/internal: Mark ff_filter_get_nb_threads() as av_pure 

It does not modify anything; it only returns a value, so it fulfills
the requirements for av_pure.
The deeper rationale behind this change is that this function is called
quite often inside arguments to FFMIN which may lead to two calls to it;
declaring this function as av_pure allows the compiler to optimize the
second call away.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-06-13 01:57:27 +02:00
parent f9136d6026
commit b76f9bcfd0
1 changed files with 1 additions and 1 deletions
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libavfilter/internal.h
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@ -363,7 +363,7 @@ static inline int ff_norm_qscale(int qscale, int type)
* Get number of threads for current filter instance.
* This number is always same or less than graph->nb_threads.
*/
int ff_filter_get_nb_threads(AVFilterContext *ctx);
int ff_filter_get_nb_threads(AVFilterContext *ctx) av_pure;
/**
* Generic processing of user supplied commands that are set