[Bug 752962] v4l2videodec: Add resolution change support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752962

kevin <kevinbing.song at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #308432|needs-work                  |none
             status|                            |
 Attachment #308432|0                           |1
        is obsolete|                            |

--- Comment #19 from kevin <kevinbing.song at gmail.com> ---
Created attachment 309390
  --> https://bugzilla.gnome.org/attachment.cgi?id=309390&action=edit
Draft patch. Only for explain the mothod.

Attached patch for explain the implement method.

Add one poll in v4l2object to dequeue event. every v4l2 buffer pool still need
one poll to dequeue buffer.
Disable dequeue event if can't subscribe event.

Is this implementation reasonable?

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