media: rockchip-vpu: I should place the huffman table at kernel or userspace ?
randy.li at rock-chips.com
Mon Sep 26 20:43:35 PDT 2016
I have just done a JPEG HW encoder for the RK3288. I have been told
that I can't use the standard way to generate huffman table, the VPU
supports only 10 levels with a different huffman table.
If I send the huffman table through the v4l2 extra control, the
memory copy is requested, although the data is not very large(2 x 64
bytes) but still a overhead. The other way is to place them in the
kernel driver, and just define the quality every time it encode a
picture. But storing in kernel would make the driver a little bigger(2 x
11 x 64 bytes) and beyond the FIFO job.
So where Should I place the huffman table?
The third produce department
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