[Bug 730863] qtvideosink: add i.MX6 zero-copy rendering implementation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=730863

Thomas McGuire <thomas.mcguire at kdab.com> changed:

           What    |Removed                     |Added
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                 CC|                            |thomas.mcguire at kdab.com

--- Comment #5 from Thomas McGuire <thomas.mcguire at kdab.com> ---
Created attachment 341939
  --> https://bugzilla.gnome.org/attachment.cgi?id=341939&action=edit
i.MX6 zero-copy rendering patch without memory leak

The patch from comment 1 can trigger a in-Kernel memory leak with certain
Kernel/GPU driver combinations such as Kernel 4.1.15-1.1.0 with GPU driver
5.0.11.p8.3.
The memory leak is about 1k per frame, and can be seen by a growing
"SUnreclaim" in /proc/meminfo and a growing "kmalloc-1024" in slabtop.

Passing the correct physical address to glTexDirectVIVMap() fixes the problem.
This is also how it is done in eglvivsink from gstreamer-imx.

I've attached a new patch against version 1.2.0 of qt-gstreamer that includes
the fix for this.

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