VIDEO_STREAM_INIT_PARMS

typedef struct {
DWORD dwMicroSecPerFrame;
DWORD dwCallback;
DWORD dwCallbackInst;
DWORD dwFlags;
DWORD hVideo;
} VIDEO_STREAM_INIT_PARMS;

The VIDEO_STREAM_INIT_PARMS structure contains information needed to initialize a video capture stream. User-mode video-capture drivers receive this structure along with a DVM_STREAM_INIT message. The structure is defined in msviddrv.h.

Members

dwMicroSecPerFrame

Contains the client-specified capture frequency, in microseconds. Represents how often the driver should capture a frame.

dwCallback

Contains either the address of a callback function, a window handle, or NULL, based on flags set in the dwFlags member.

dwCallbackInst

Contains client-specified instance data passed to the callback function, if CALLBACK_FUNCTION is set in dwFlags.

dwFlags

Contains flags. Can contain one (or none) of the following flags.

Flag	Definition
CALLBACK_WINDOW	Indicates dwCallback contains a window handle.
CALLBACK_FUNCTION	Indicates dwCallback contains a callback function address.

hVideo

Contains a handle to a video channel.

Comments

The dwCallback, dwCallbackInst, and dwFlags members contain information needed by the driver to deliver callback messages. For more information, see Notifying Clients from Video Capture Drivers.