public enum StateChange {
NULL_TO_READY,
READY_TO_PAUSED,
PAUSED_TO_PLAYING,
PLAYING_TO_PAUSED,
PAUSED_TO_READY,
READY_TO_NULL,
}
NULL_TO_READY,
READY_TO_PAUSED,
PAUSED_TO_PLAYING,
PLAYING_TO_PAUSED,
PAUSED_TO_READY,
READY_TO_NULL,
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