Gst.Message.new_state_changed

function new_state_changed(src:Gst.Object, oldstate:Gst.State, newstate:Gst.State, pending:Gst.State):Gst.Message {
    // Gjs wrapper for gst_message_new_state_changed()
}

Create a state change message. This message is posted whenever an element changed its state.

src: the object originating the message
oldstate: the previous state
newstate: the new (current) state
pending: the pending (target) state
Returns: the new state change message. MT safe.