Get a message from the bus, waiting up to the specified timeout.
If @timeout is 0, this function behaves like gst_bus_pop(). If @timeout is
#GST_CLOCK_TIME_NONE, this function will block forever until a message was
posted on the bus.
the #GstMessage that is on the
bus after the specified timeout or %NULL if the bus is empty
after the timeout expired. The message is taken from the bus
and needs to be unreffed with gst_message_unref() after usage.
Get a message from the bus, waiting up to the specified timeout.
If @timeout is 0, this function behaves like gst_bus_pop(). If @timeout is #GST_CLOCK_TIME_NONE, this function will block forever until a message was posted on the bus.