reading a capture from v4l1

[Jeffrey Dever]

I'm perplexed as to how to read captures from the video device. I can do quite a bit to control my webcam (probe, set window ...) but there seems to be several modes of reading captures. I'm just trying to do a simple capture, so I don't want to use mmap at this point as I want to keep it as simple as possible.

I expect to use VIDIOCCAPTURE. I can see that we call this ioctl to start capturing, but don't see how to read the data. Do we start capturing, do a read() and then stop capturing? What is the sequence of steps?







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