[Bug 785680] v4l2: Flags and Timestamp are lost when importing downstream buffer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785680

Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> changed:

           What    |Removed                     |Added
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 Attachment #356726|needs-work                  |none
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--- Comment #5 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 356727
  --> https://bugzilla.gnome.org/attachment.cgi?id=356727&action=edit
v4l2bufferpool: Copy flags and timestamp when importing

[Update] Fixed the ref-counting so the buffer is writable upon copy

Whenever we import from downstream pool (userptr or dmabuf-import), we
should copy over the flags and timestamp, otherwise downstream will not
get proper synchronization or will not be able to notice frames that has
corruption in it.

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