DVM_STREAM

DVM_STREAM_INIT

See also VIDEO_STREAM_INIT_PARMS

Notifies a video capture driver to initialize a video device for streaming.

Returns DV_ERR_OK if successful or an error code otherwise.. Otherwise, it returns an error number. The following errors are defined:

DV_ERR_ALLOCATED	Indicates the specified resource is already allocated.
DV_ERR_NOMEM	Indicates the driver is unable to allocate or lock memory.

dwParam1

Address of a VIDEO_STREAM_INIT_PARMS structure.

dwParam2

Size, in bytes, of the VIDEO_STREAM_INIT_PARMS structure.

This message must precede all other streaming messages for a channel.

If a window or callback function will receive callback messages, the device driver uses the following messages to indicate the progress of video input: MM_DRVM_OPEN, MM_DRVM_CLOSE, MM_DRVM_DATA, and MM_DRVM_ERROR.

If a callback function is used, it must reside in a DLL. You do not have to use MakeProcInstance to get a procedure-instance address for the callback function.

For VIDEO_EXTERNALIN channels, DVM_STREAM_INIT triggers capturing of data to the frame buffer.

For VIDEO_EXTERNALOUT channels with overlay capabilities, DVM_STREAM_INIT enables the overlay.