[Bug 795235] xvimagesink fails: unexpected XShm image size

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795235

--- Comment #13 from David Woodhouse <dwmw2 at infradead.org> ---
(In reply to Nicolas Dufresne (ndufresne) from comment #10)
> Ok, I thought, hey, let's the driver choose, but I notice a Gst ends up
> reading too far. That's because the Intel driver math is wrong for odd width:
> 
> Bug is quite evident:
> https://cgit.freedesktop.org/xorg/driver/xf86-video-intel/tree/src/uxa/
> intel_video.c#n814
> "tmp = ((*w >> 1) + 3) & ~3;"

But see #n793 a few lines above:

    *w = (*w + 1) & ~1;

I'm not sure the Intel driver *is* at fault here. Are you sure you're not using
the glamor_gl version, which I already fixed (comment 7)?

Although it doesn't really matter much, except to get the blame right in your
comments. Some driver(s) get it wrong and thus we should probably work around
it by padding.

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