VSD_DDCMD Parameter - ulFlags

ulFlags (ULONG)

The following flags (subcommands) are defined for this command:

DDCMD_CONTROL

This subcommand of VSD_DDCMD performs a device-specific command. pRequest is a pointer to the DDCMDCONTROL structure.
DDCMD_DEREG_STREAM
This subcommand of VSD_DDCMD deregisters a stream instance with the device driver. pRequest is a pointer to DDCMDDEREGISTER structure.
DDCMD_READ
This subcommand of VSD_DDCMD is used by a stream handler to give an empty buffer to the VSD (for example, during a record operation). When the buffer has been filled, the VSD is responsible for communicating to the caller that the buffer has been filled. The VSD should pass a MSG_REPORTINT structure to the pSHDEntryPoint in DDCMDREGISTER to inform the caller.

pRequest is a pointer to DDCMDREADWRITE structure.

DDCMD_REG_STREAM
This subcommand of VSD_DDCMD registers a stream instance with the device driver. pRequest is a pointer to DDCMDREGISTER structure.
DDCMD_SETUP
This subcommand of VSD_DDCMD performs device-specific stream instance setup. pRequest is a pointer to DDCMDSETUP structure.
DDCMD_STATUS
This VSD subcommand requests streaming status from a device. Typically, it is called to request the current stream time. pRequest is a pointer to DDCMDSTATUS structure.
DDCMD_WRITE
This VSD subcommand is used by a stream handler to give a full buffer to the VSD (for example, during a playback operation). When the buffer has been consumed, the VSD is responsible for communicating to the caller that the buffer has been used. The VSD should pass a MSG_REPORTINT structure to the pSHDEntryPoint in DDCMDREGISTER to inform the caller.

pRequest is a pointer to DDCMDREADWRITE structure.

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