c_gst_collect_pads_set_event_function

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GstCollectPads* pads, GstCollectPadsEventFunction func, void* userData) c_gst_collect_pads_set_event_function;

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