Re: [Workshop-2011] Media summit/KS-2012 proposals

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2012/9/6 Hans Verkuil <hverkuil@xxxxxxxxx>:
> On Thu 6 September 2012 12:29:17 Jun Nie wrote:
>> 2012/9/6 Hans Verkuil <hverkuil@xxxxxxxxx>:
>> > On Thu September 6 2012 06:09:44 Jun Nie wrote:
>> >> 2012/9/5 Hans Verkuil <hverkuil@xxxxxxxxx>:
>> >> > On Wed 5 September 2012 10:04:41 Jun Nie wrote:
>> >> >> Is there any summary for this summit or presentation material? I am
>> >> >> looking forward for some idea on CEC. It is really complex in
>> >> >> functionality.
>> >> >> Maybe other guys is expecting simiar fruite from summit too.
>> >> >
>> >> > Yes, there will be a summit report. It's not quite finished yet, I think.
>> >> >
>> >> > With respect to CEC we had some useful discussions. It will have to be a
>> >> > new class of device (/dev/cecX), so the userspace API will be separate from
>> >> > drm or v4l.
>> >> >
>> >> > And the kernel will have to take care of the core CEC protocol w.r.t. control
>> >> > and discovery due to the HDMI 1.4a requirements.
>> >> >
>> >> > I plan on starting work on this within 1-2 weeks.
>> >> >
>> >> > My CEC presentation can be found here:
>> >> >
>> >> > http://hverkuil.home.xs4all.nl/presentations/v4l2-workshop-cec.odp
>> >> >
>> >> > Regards,
>> >> >
>> >> >         Hans
>> >>
>> >> Thanks for quick response! It's good to know that CEC is independent
>> >> with DRM/V4L for my HDMI implementation is FB/lcd-device based. CEC is
>> >> also deserved to have independent management in both hardware signal
>> >> and functionality. Someone also expressed similar thoughts before.
>> >> Will remote control protocal parsing are done in userspace reference
>> >> library? Or not decided yet?
>> >
>> > Are you referring to the remote control pass-through functionality?
>> > I don't know yet whether that will go through a userspace library or
>> > through the RC kernel subsystem, or possibly both.
>
>> I mean all the feature that can involved in handhold remote control,
>> one touch play, standby, on screen display, etc, such as
>> play/pause/poweroff. I want to mention all non CDC features that can
>> be implemented in user space. They are hard to be covered by any
>> sub-system and user space library is more proper. Just like your
>> metaphor, kitchen sink for CEC. I like your words.
>
> Yes, that will all be userspace.
>
> My plan is to have the CEC adapter driver handle the core CEC protocol,
> allow other drivers to intercept messages that are relevant for them and
> send messages themselves, and anything that remains will be available to
> userspace for which a new library will be created.
>
> Now, don't ask me about any of the details, since I don't have them yet :-)
> My plan is to start working on this next week or the week after.
>
> Are you willing to test early versions of this work? Can you test HDMI 1.4a
> features as well? Testing this might well be one of the harder things to do.
>
I am willing to test or contribute to the library. But my hardware
does not include HEAC. So my test scope limites to the features that
can be implemented in user space.

> Regards,
>
>         Hans
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