PLAYL_EVCB Field - ulSubType

ulSubType (ULONG)

Identifies the event subtype. This field is used to further subdivide an event type. Following is a list of system-defined implicit events:

EVENT_PLAYLISTCUEPOINT

Playlist cuepoint event. This event is reported by the target stream handler when the memory stream handler is the source for a stream instance. The memory stream handler passes the cuepoint information attached to a stream buffer when calling the Sync/Stream Manager. The Sync/Stream Manager passes the cuepoint information to the target stream handler attached to the same buffer.
EVENT_PLAYLISTMESSAGE
Playlist message event. This event is reported by the memory stream handler when a playlist MESSAGE_OPERATION instruction is interpreted by the memory stream handler.

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