avfilter/vf_scale: store the offset in a local variable before adding it

[ffmpeg] / libavutil / eval.h

diff --git a/libavutil/eval.h b/libavutil/eval.h
index dacd22b96e66cec8818f1b2f5c806df166eb9d86..068c62cdab03ce5dfece0418d89a18c2b93fb10c 100644 (file)
--- a/libavutil/eval.h
+++ b/libavutil/eval.h
@@ -86,6 +86,30 @@ int av_expr_parse(AVExpr **expr, const char *s,
  */
 double av_expr_eval(AVExpr *e, const double *const_values, void *opaque);
 
+/**
+ * Track the presence of variables and their number of occurrences in a parsed expression
+ *
+ * @param counter a zero-initialized array where the count of each variable will be stored
+ * @param size size of array
+ * @return 0 on success, a negative value indicates that no expression or array was passed
+ * or size was zero
+ */
+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().
  */