GF_Err gf_filter_act_as_sink(GF_Filter *filter)
{
	if (!filter) return GF_BAD_PARAM;
	filter->act_as_sink = GF_TRUE;
	return GF_OK;
}
GF_Err gf_filter_act_as_sink(GF_Filter *filter)
{
	if (!filter) return GF_BAD_PARAM;
	filter->act_as_sink = GF_TRUE;
	return GF_OK;
}