kmssink on two spearate display

[Nicolas Dufresne]

Le mer. 4 avr. 2018 20:41, Matteo Valdina <matteo.valdina at gmail.com> a
écrit :

> Hi,
> I'm trying to drive two separate display with kmssink (intel driver).
>
> I created two separate pipelines:
>  pipeline 1 v4l2src device=/dev/video0 ! kmssink conncetor-id=63
>  pipeline 1 v4l2src device=/dev/video0 ! kmssink conncetor-id=58
>
> My problem is that the second pipeline encounter and error on accessing
> DRM resources.
> So, I implemented a simple test application that runs the two pipelines
> inside a single process.
> Only the first pipeline works, the second encounters these error:
>
> 0:00:00.124567628  6195 0x7f31400028a0 ERROR                kmssink
> gstkmssink.c:498:configure_mode_setting:<kmssink1> Failed to set mode:
> Permission denied
> 0:00:00.124603970  6195 0x7f31400028a0 WARN                 kmssink
> gstkmssink.c:1058:gst_kms_sink_set_caps:<kmssink1> error: failed to
> configure video mode
>
> I'm using GStreamer 1.14 and it using an i915.
>
> Can kmssink work concurrently run on two different display but the same
> video card?
>

No, this would require the same FD being shared among kmssink, which is not
implemented (or a cookie?). Obviously you could sudo it, but overall,
kmssink need to be ported to atomic APIs to work smoothly.


> Best
> Matteo
>
>
>
>
> --
> “There are two ways of constructing a software design: One way is to make
> it so simple that there are obviously no deficiencies, and the other way is
> to make it so complicated that there are no obvious deficiencies. The first
> method is far more difficult.”
> - Tony Hoare
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