+
+ /**
+ * Sets the number of extra hardware frames which the filter will
+ * allocate on its output links for use in following filters or by
+ * the caller.
+ *
+ * Some hardware filters require all frames that they will use for
+ * output to be defined in advance before filtering starts. For such
+ * filters, any hardware frame pools used for output must therefore be
+ * of fixed size. The extra frames set here are on top of any number
+ * that the filter needs internally in order to operate normally.
+ *
+ * This field must be set before the graph containing this filter is
+ * configured.
+ */
+ int extra_hw_frames;