On 14/06/12 05:17, Scott Jiang wrote:
I would expect that the combination of v4l2_mbus_framefmt + v4l2_dv_timings
gives you the information you need.
I can solve this problem in HD, but how about SD? Add a fake
dv_timings ops in SD decoder driver?
No, you add g/s_std instead. SD timings are set through that API. It is not so
much that you give explicit timings, but that you give the SD standard. And from
that you can derive the timings (i.e., one for 60 Hz formats, and one for 50 Hz
formats).
Yes, it's a solution for decoder. I can convert one by one. But how
about sensors?They can output VGA, QVGA or any manual resolution.
My question is why we can't add these blanking details in
v4l2_mbus_framefmt? This structure is used to describe frame format on
media bus. And I believe blanking data also transfer on this bus. I
know most hardwares don't care about blanking areas, but some hardware
such as PPI does. PPI can capture ancillary data both in herizontal
and vertical interval. Even it works in active video only mode, it
expects to get total timing info.
Since I don't know what you are trying to do, it is hard for me to give
a good answer.
So first I'd like to know if this is related to the adv7842 chip? I think
you are talking about how this is done in general, and not specifically in
relationship to the adv7842. At least, I can't see how/why you would
hook up a sensor to the adv7842.
Sensor configuration is a separate topic, and something I am not an
expert on. People like Sakari Ailus and Laurent Pinchart know much
more about that than I do.
I know that there is some support for blanking through low-level image source
controls:
http://hverkuil.home.xs4all.nl/spec/media.html#image-source-controls
This is experimental and if this is insufficient for your requirements than
I suggest posting a message where you explain what you need, CC-ing the people
I mentioned,
Most of these APIs are quite new and by marking them as experimental we can
make changes later if it turns out it is not good enough.
Regards,
Hans
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