[Bug 776927] gl: gldownload: convert GstGLMemory to GstDmaBuf

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776927

Matt Fischer <mattfischer84 at gmail.com> changed:

           What    |Removed                     |Added
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 Attachment #352676|needs-work                  |none
             status|                            |
 Attachment #352676|0                           |1
        is obsolete|                            |

--- Comment #52 from Matt Fischer <mattfischer84 at gmail.com> ---
Created attachment 354656
  --> https://bugzilla.gnome.org/attachment.cgi?id=354656&action=edit
Patch to add dmabuf export to gldownload

Doh, sorry about the 64-bit thing.  Here's a version that should fix it.  I
made local duplicates of the fd and the stride as well just for consistency.

I've also changed the offset logic to what I think you meant in your previous
comment.  Can you confirm that it's right, though?  I can't seem to find a good
test case because everything is always just 0 in my tests, but let me know if I
misunderstood you and I'll get it fixed.

Does this address everything?  I didn't quite follow some of your comments
above, so I'm not sure if there was anything else you wanted me to correct.

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