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.

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