lavfi: add a preinit callback to filters.

It is necessary for filters with child objects, to set the class and default options values.

Nicolas George committed 9 years ago

Commit f8d7b5f1 parent 19804022 files · +23 −0Browse files

Showing the changes to libavfilter/avfilter.h (1 of 2 files). Show all

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@@ -194,6 +194,21 @@ typedef struct AVFilter { · 193 unmodified lines
194	194	*****************************************************************
195	195	*/
196	196
	197	+ /**
	198	+ * Filter pre-initialization function
	199	+ *
	200	+ * This callback will be called immediately after the filter context is
	201	+ * allocated, to allow allocating and initing sub-objects.
	202	+ *
	203	+ * If this callback is not NULL, the uninit callback will be called on
	204	+ * allocation failure.
	205	+ *
	206	+ * @return 0 on success,
	207	+ * AVERROR code on failure (but the code will be
	208	+ * dropped and treated as ENOMEM by the calling code)
	209	+ */
	210	+ int (preinit)(AVFilterContext ctx);
	211	+
197	212	/**
198	213	* Filter initialization function.
199	214	*

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