MCI_STEP - Win32 Multimedia Programmer's Reference (mmedia.hlp)

MCI_STEP

The MCI_STEP command steps the player one or more frames. Digital-video, VCR, and CAV-format videodisc devices recognize this command.

MCIERROR mciSendCommand(MCIDEVICEID wDeviceID, MCI_STEP,
DWORD dwFlags, (DWORD) (LPMCI_GENERIC_PARMS) lpStep);

Parameters
wDeviceID
Device identifier of the MCI device that is to receive the command message.

dwFlags

MCI_NOTIFY, MCI_WAIT, or, for digital-video and VCR devices, MCI_TEST. For information about these flags, see The Wait, Notify, and Test Flags.

lpStep

Address of an MCI_GENERIC_PARMS structure. (Devices with extended command sets might replace this structure with a device-specific structure.)

Return Values
Returns zero if successful or an error otherwise.

Remarks
This command supports devices that return TRUE to the MCI_GETDEVCAPS_HAS_VIDEO flag of the MCI_GETDEVCAPS command.

The following additional flags are used with the digitalvideo device type:

MCI_DGV_STEP_FRAMES

The dwFrames member of the structure identified by lpStep specifies the number of frames to advance before displaying another image.

MCI_DGV_STEP_REVERSE

Steps in reverse.

For digital-video devices, the lpStep parameter points to an MCI_DGV_STEP_PARMS structure.

The following additional flags are used with the vcr device type:

MCI_VCR_STEP_FRAMES

The dwFrames member of the structure identified by lpStep specifies the number of frames to advance before displaying another image.

MCI_VCR_STEP_REVERSE

Steps in reverse.

For VCR devices, the lpStep parameter points to an MCI_VCR_STEP_PARMS structure.

The following additional flags are used with the videodisc device type:

MCI_VD_STEP_FRAMES

The dwFrames member of the structure identified by lpStep specifies the number of frames to step.

MCI_VD_STEP_REVERSE

Steps in reverse.

For videodisc devices, the lpStep parameter points to an MCI_VD_STEP_PARMS structure.

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