## MMPM/2 Device Driver Reference

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### DDCMDREGISTER Field - ulStreamOperation

ulStreamOperation (ULONG) Specifies the stream operation (record or playback). The device driver should verify with how it has been initialized through IOCtls. The following stream operations are defined ( VSDs should verify with VSD_SET or VSD_OPEN settings):

STREAM_OPERATION_CONSUME Playback.
STREAM_OPERATION_PRODUCE Record.