Available on js
@:value(cast "alternate")@:enum@:implinlineread onlyALTERNATE:PlaybackDirection = "alternate"
@:value(cast "alternate-reverse")@:enum@:implinlineread onlyALTERNATE_REVERSE:PlaybackDirection = "alternate-reverse"
@:value(cast "normal")@:enum@:implinlineread onlyNORMAL:PlaybackDirection = "normal"
@:value(cast "reverse")@:enum@:implinlineread onlyREVERSE:PlaybackDirection = "reverse"