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

[Jun Nie <niej0001@gmail.com>]

2012/9/6 Hans Verkuil <hverkuil@xs4all.nl>:
> On Thu September 6 2012 06:09:44 Jun Nie wrote:
>> 2012/9/5 Hans Verkuil <hverkuil@xs4all.nl>:
>> > 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.
>
> Most of the other non-system messages will go to a userspace library.
Does routing/address is included in system message here?
>
> But I haven't started coding yet, so it is very early days :-)
>
> The main thing is that at least I now have a high-level design that
> I can start to work with.
>
> Regards,
>
>         Hans