Please explain gst_bus_add_watch() method

[Shubham Shrivastava]

>>>>>>gst_bus_add_watch (bus, my_bus_callback, NULL);<<<<<<<

why we pass an argument like this-------my_bus_callback-----

in gst_bus_add_watch instead of my_bus_callback(*bus,*message,user_data)

because here my_bus_callback is of type  gboolean  (*GstBusFunc)

gboolean
(*GstBusFunc) (GstBus *bus,
               GstMessage *message,
               gpointer user_data);

So how *bus,*messsage and user_data is going

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