•Media is any form of data that
changes meaningfully with respect to time.
•Time class- represents a time instant
•Duration interface is implemented
by classes that can compute and advertise the duration of the media they handle.
•For example Players and Processors
extend Duration interface.
•Interface TimeBase - uncontrolled source of clock ticks
•Interface Clock - controlled source of clock ticks
•Clock can be stopped, restarted,
rate can be adjusted.
•Analogy: crystal oscillator Vs
digital clock.