## MMPM/2 Device Driver Reference

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### SPCB Field - ulDataFlags

ulDataFlags (ULONG) Attributes of the data type (that is, it specifies whether data or time cue points are supported by this data type).

SPCBDATA_CUEDATA This data type can support data cue-point events.

SPCBDATA_CUETIME This data type can support time cue-point events.

SPCBDATA_NOSEEK Seeking cannot be done on this data type.

SPCBDATA_YIELDTIME This flag indicates that the ulBytesPerUnit field of the SPCB is interpreted as a millisecond yield time value. This yield takes place in between each I/O read operation. The yield time will also dynamically lower during data streaming depending on how many buffers in the stream are full. This flag is mutually exclusive with the SPCBHAND_ GENTIME flag and it can only be used with the SPCBBUF_INTERLEAVED flag. The maximum yield time is 1 second.