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From: Fritz Koenig <frkoenig@google.com>
To: Nicolas Dufresne <nicolas@ndufresne.ca>
Cc: Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: Re: V4L2 logging for multiple streams
Date: Mon, 1 Feb 2021 10:53:00 -0800	[thread overview]
Message-ID: <CAMfZQbyipb18qLJwhSwA1QS+63BrRnkFQ6mLBPs-xQBWw3aEoQ@mail.gmail.com> (raw)
In-Reply-To: <350a927bafbc6cf3e690db6f33bebbdafeb96d6d.camel@ndufresne.ca>

On Thu, Jan 28, 2021 at 1:45 PM Nicolas Dufresne <nicolas@ndufresne.ca> wrote:
>
> Le vendredi 15 janvier 2021 à 20:33 -0800, Fritz Koenig a écrit :
> > Hi,
> >
> > I'm trying to sort some issues with regards to decoding multiple
> > streams at once.  Logging can be helpful with messages like this:
> >
> > [105188.500450] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> >
> > but when I have:
> >
> > [105188.498697] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> > [105188.498715] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> > [105188.499116] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> > [105188.500450] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> > [105188.500467] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> > [105188.500611] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> > [105188.501879] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> > [105188.502276] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> > [105188.502331] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> >
> > I can't tell which stream VIDIOC_STREAMOFF is associated with.  Is
> > there a logging option that I'm missing that would help indicate which
> > stream that ioctl is associated with.
>
> I suppose this is m2m driver ? I think it would be nice to trace some instance
> ID, otherwise indeed, if you have two stream on the same m2m device node, the
> traces get confused.
>

Yes, m2m.  Instance doesn't seem to be a concept at that level.  The
driver itself holds an idea of instances (at least on venus).  I was
able to add debugging to trace instances in vdec.c, but I don't see a
generic way to add it.

-Fritz

>
> >
> > Thanks.
> >
> > -Fritz
>
>

      reply	other threads:[~2021-02-01 18:53 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-16  4:33 V4L2 logging for multiple streams Fritz Koenig
2021-01-20 10:07 ` Kieran Bingham
2021-02-06  0:59   ` Fritz Koenig
2021-01-28 21:44 ` Nicolas Dufresne
2021-02-01 18:53   ` Fritz Koenig [this message]

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