On 26 Jan 2001, Gerd Knorr wrote:
> (VIDIOC_S_FMT). Then ask the driver using REQBUFS for buffers,
> indicating whenever you want to use your own userspace memory buffers
> or mmap() the memory from the driver. For the second case you'll
> have to mmap() the buffers here. The you can queue the number of
> buffers VIDIOC_QBUF which you aquired using REQBUFS, start capture
> with VIDIOC_STREAMON, get/requeue buffers using VIDIOC_DQBUF/VIDIOC_QBUF
> until you are done, and finally call VIDIOC_STREAMOFF and REQBUFS(0).
> munmap() the driver memory if needed.
For a bt848, when are the risc program(s) generated? When REQBUFS is called,
or when VIDIOC_QBUF is called?
> Packed pixel formats can use the v4l2_pix_format.bytesperline to
> specify any padding they want. Planar formats can't have padding
> (any objections on this? If so: why? I can't think of any useful
> application for this...).
What if you want to overlay the video into a larger image, except you're
using planar mode? What about clipping?
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