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avutil/eval: Add av_expr_count_func() similar to av_expr_count_vars()

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2019-12-06 17:18:16 +01:00
parent 26f040bcb4
commit 45259a0ee4
4 changed files with 38 additions and 9 deletions
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14
libavutil/eval.h
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@@ -96,6 +96,20 @@ double av_expr_eval(AVExpr *e, const double *const_values, void *opaque);
*/
int av_expr_count_vars(AVExpr *e, unsigned *counter, int size);
/**
* Track the presence of user provided functions and their number of occurrences
* in a parsed expression.
*
* @param counter a zero-initialized array where the count of each function will be stored
* if you passed 5 functions with 2 arguments to av_expr_parse()
* then for arg=2 this will use upto 5 entries.
* @param size size of array
* @param arg number of arguments the counted functions have
* @return 0 on success, a negative value indicates that no expression or array was passed
* or size was zero
*/
int av_expr_count_func(AVExpr *e, unsigned *counter, int size, int arg);
/**
* Free a parsed expression previously created with av_expr_parse().
*/