the NULL state or initial state of an element.
the element is PAUSED, it is ready to accept and process data. Sink elements however only accept one buffer and then block.
the element is PLAYING, the #GstClock is running and the data is flowing.
the element is ready to go to PAUSED.
no pending state.
The possible states an element can be in. States can be changed using gst_element_set_state() and checked using gst_element_get_state().