video: add generic video(4) capture frameworkAdd a new video(4) framework that provides /dev/videoN, buffermanagement, mmap lifetime, and V4L2 ioctl dispatch for video capturedrivers. Hardware dr
video: add generic video(4) capture frameworkAdd a new video(4) framework that provides /dev/videoN, buffermanagement, mmap lifetime, and V4L2 ioctl dispatch for video capturedrivers. Hardware drivers implement struct video_hw_ops callbacksand use video_buf_acquire/write/done to deliver frames.Reviewed by: adrianDifferential Revision: https://reviews.freebsd.org/D58367
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