[Bug 742922] Reverse playback problem on vaapidecode

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=742922

--- Comment #29 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 328420
  --> https://bugzilla.gnome.org/attachment.cgi?id=328420&action=edit
vaapidecoder_h264: make sure to confirm if decoder is initialized when starting
to decode a frame

See commit message.

In details, during reverse playback, upstream sends bunch of buffers.
base decoder get all those buffers and keep until discont buffer reaches.

eg. | 1 2 3 4 5 6 7 8 9(discont) |
      K       K       

In this case, base decoder parse all these buffers, starts to decode 1 2 3 4
and push decoded buffers to downstream. And then trys to continue to decode 5 6
7 8 9,
At the moment, crash happens.
Because base decoder calls flush method, which does full-reset in vaapi
decoder.

This patch looks workaround, but I want to share this problem.

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