[Bug 790752] msdk: supports bufferpool

[GStreamer (GNOME Bugzilla)]

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

--- Comment #117 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 368295
  --> https://bugzilla.gnome.org/attachment.cgi?id=368295&action=edit
msdkdec: use bufferpool

1\ In decide_allocation, it makes its own msdk bufferpool.
  - If downstream supports video meta, it just replace it with the msdk
bufferpool.
  - If not, it uses the msdk bufferpool as a side pool, which will be decoded
into.
    and will copy it to downstream's bufferpool.

2\ Decide if using video memory or system memory.
  - This is not completed in this patch.
  - It might be decided in update_src_caps.
  - But tested for both system memory and video memory cases.

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