signal callback delegate or function to connect
bool callback(gst.query.Query query, gstapp.app_sink.AppSink appSink)
query the allocation query (optional)
appSink the instance the signal is connected to (optional)
Returns
Yes.After to execute callback after default handler, No.After to execute before (default)
Signal ID
Connect to ProposeAllocation signal.
Signal that a new propose_allocation query is available.
This signal is emitted from the streaming thread and only when the "emit-signals" property is true.