MediaReadyState
An enumeration of media ready states.
CurrentData = 2
Data for immediate playback is available, but not enough
to advance.
EnoughData = 4
All conditions are met and playback should immediately
execute.
FutureData = 3
Enough data for the current and further positions are
available.
Metadata = 1
Enough information obtained such that the duration of the
resource is available.
Nothing = 0
No information is available.