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 (2 of 2 files). Show all

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@@ -692,6 +692,7 @@ static int default_execute(AVFilterContext ctx, avfilter_action_func func, voi · 691 unmodified lines
692	692	AVFilterContext ff_filter_alloc(const AVFilter filter, const char *inst_name)
693	693	{
694	694	AVFilterContext *ret;
	695	+ int preinited = 0;
695	696
696	697	if (!filter)
697	698	return NULL;
@@ -708,6 +709,11 @@ AVFilterContext ff_filter_alloc(const AVFilter filter, const char *inst_name) · 10 unmodified lines
708	709	if (!ret->priv)
709	710	goto err;
710	711	}
	712	+ if (filter->preinit) {
	713	+ if (filter->preinit(ret) < 0)
	714	+ goto err;
	715	+ preinited = 1;
	716	+ }
711	717
712	718	av_opt_set_defaults(ret);
713	719	if (filter->priv_class) {
@@ -745,6 +751,8 @@ AVFilterContext ff_filter_alloc(const AVFilter filter, const char *inst_name) · 31 unmodified lines
745	751	return ret;
746	752
747	753	err:
	754	+ if (preinited)
	755	+ filter->uninit(ret);
748	756	av_freep(&ret->inputs);
749	757	av_freep(&ret->input_pads);
750	758	ret->nb_inputs = 0;

@@ -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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