## MMPM/2 Device Driver Reference

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### VCAI_QUERYVIDEOSIGNAL (68h) - Query Video Input Connector's Signal

Category:
VIDEO_IOCTL_CAT (140)
Function:
VCAI_QUERYVIDEOSIGNAL (68h)
Description:
Query Video Input Connector's Signal

Select an item:

    Description
    Parameter Packet Format
    Data Packet Format
    Returns

This IOCtl is used to determine if the current video input connector has a valid video signal present. For example, this IOCtl could be used to help automatically detect which video input has a camera attached and turned on or whether or not the tuner is tuned to a valid channel.