[Bug 790752] msdk: supports bufferpool

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790752

--- Comment #97 from Hyunjun Ko <zzoon at igalia.com> ---
(In reply to sreerenj from comment #94)
> Review of attachment 368120 [details] [review]:
> 
> Would it be better to use videomemory always(default)?
> According to msdk spec,system-mem is only preferred if software decoder is
> in use.

Um.. I was thinking so but copying from vaDeriveImage to other user space is
sometimes very slow.

For example, in this pipeline msdkh264dec ! videoconvert ! xvimagesink,
if the decoder use video memory, playing is very slow probably on skylake.

I already sent this thing with some links to be referenced.

How about doing that (video memory by default in decoder) after we finish the
task for handling dmabuf?

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