[Bug 795023] New: kmssink: add drm-fd property

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795023

            Bug ID: 795023
           Summary: kmssink: add drm-fd property
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: matteo.valdina at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 370572
  --> https://bugzilla.gnome.org/attachment.cgi?id=370572&action=edit
patch for drm-fd property

When I try to use two different pipelines (two different src, two different
kmssink, and two different displays) but one single DRM device (in my case an
i915) it fails because the device was in use by the first pipeline (single
process).

I added the ability to get/set the DRM device FD in kmssink. This solved my
scenario.

I think that passing or get the FD could be handy in other scenarios where you
want to open the device earlier or you need to do something on the DRM device.

I tested this patch on 1.14 branch and a simple application that start two
pipelines in the same process for each output display.

When the first pipeline is in the running state I get the DRM FD and set DRM FD
on the second pipeline. 

Best
Matteo Valdina

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