Re: [PATCH 01/24] v4l: Add metadata buffer type and format

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Hi Hans,

On Fri, 24 Jun 2016, Hans Verkuil wrote:

> On 06/24/2016 05:57 PM, Hans Verkuil wrote:
> > On 06/20/2016 09:10 PM, Laurent Pinchart wrote:
> >> The metadata buffer type is used to transfer metadata between userspace
> >> and kernelspace through a V4L2 buffers queue. It comes with a new
> >> metadata capture capability and format description.
> >>
> >> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> > 
> > I am willing to Ack this, provided Sakari and Guennadi Ack this as well. They know
> > more about metadata handling in various types of hardware than I do, so I feel
> > their Acks are important here.
> 
> Actually, I would like to see more about how applications can associate frames with
> metadata (if such a correspondence exists).

I think Laurent mentioned this in one of his patches, that the sequence 
number should be used to establish a correspondence, and this is also what 
my UVC patch does.

Thanks
Guennadi

> There was an irc discussion about that here:
> 
> https://linuxtv.org/irc/irclogger_log/v4l?date=2016-06-24,Fri
> 
> Guennadi's uvc patches may be useful as a testbed for figuring this out.
> 
> Regards,
> 
> 	Hans
> 



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