This message informs the mixer device that the application wishes to read or write buffers directly and sets up the device in the correct mode (for example, PCM, MPEG audio or MIDI).

ulParam1 (ULONG)

This parameter can contain any of the following flags:

MCI_NOTIFY

A notification message is posted to the window specified in the hwndCallback field of the data structure identified by pParam2 when the action indicated by this message is completed.
MCI_WAIT
Control is not returned until the action indicated by this message is completed.
MCI_MIXSETUP_INIT
Initializes the mixer for the correct mode according to the value specified in the ulFormatMode field of MCI_MIXSETUP_PARMS.
MCI_MIXSETUP_DEINIT
Deinitializes the mixer.
MCI_MIXSETUP_QUERYMODE
Queries a device to see if a specific mode is supported.

pParam2 (PMCI_MIXSETUP_PARMS)

A pointer to the MCI_MIXSETUP_PARMS data structure.

rc (ULONG)

Return codes indicating success or type of failure:

MCIERR_SUCCESS

Command completed successfully.
MCIERR_INVALID_DEVICE_ID
Invalid device ID given.
MCIERR_MISSING_PARAMETER
Required parameter is missing.
MCIERR_INVALID_MODE
Device mode invalid for this command.
MCIERR_INVALID_DEVICE_TYPE
Mixer does not support the requested device type.
MCIERR_INVALID_FLAG
Invalid flag specified for this command.

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