how to make qbuf

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Hi.

I'm making V4l2 device driver for mplayer.
But
It's too difficult to understand V4l2 driver internal structure.

I can't understand how to use VIDIOC_QBUF, VIDIOC_DQBUF ioctl and 'struct
videobuf_queue'

Why does v4l2 driver need to use 'videobuf_queue'?

Please. tell me v4l2 driver internal operation.

Thanks.
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