[Bug 769248] New: plugins: Update buffer pool size with new va allocator's image

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=769248

            Bug ID: 769248
           Summary: plugins: Update buffer pool size with new va
                    allocator's image
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zzoon at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

During test, I found something wrong.

In some media, there happens video size update in
allocator_configure_image_info.
And the updated size is used when allocating gst memory.

But bufferpool's each buffer size is already set by caps/query info.
This leads to dismatch between bufferpool's set size and real allocated buffer
size.

In this case, it causes every buffer is freed during release in bufferpool,
which should be reused. This would affect performance.

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