Video for Linux Two API Specification: Revision 0.24
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ioctl VIDIOC_OVERLAY

Name

VIDIOC_OVERLAY -- Start or stop video overlay

Synopsis

int ioctl(int fd, int request, const int *argp);

Arguments

fd

File descriptor returned by open().

request

VIDIOC_OVERLAY

argp

Description

This ioctl is part of the video overlay I/O method. Applications call VIDIOC_OVERLAY to start or stop the overlay. It takes a pointer to an integer which must be set to zero by the application to stop overlay, to one to start.

Drivers do not support VIDIOC_STREAMON or VIDIOC_STREAMOFF with V4L2_BUF_TYPE_VIDEO_OVERLAY.

Return Value

On success 0 is returned, on error -1 and the errno variable is set appropriately:

EINVAL

Video overlay is not supported, or the parameters have not been set up. See Section 4.2 for the necessary steps.

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ioctl VIDIOC_LOG_STATUSUpioctl VIDIOC_QBUF, VIDIOC_DQBUF