[Bug 785237] omxvideodec: Fix segment seek

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785237

--- Comment #1 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 356127
  --> https://bugzilla.gnome.org/attachment.cgi?id=356127&action=edit
omxvideodec: Fix segment seek

On segment seek, unlike EOS, we drain, but we cannot expect a flush
later to reset the decoder state. As a side effect, the decoder would
remain in EOS state and ignore any new incoming buffers.

To fix this, we call _flush() inside the _drain() function, and
_finish() becomes what _drain() was before. This way, for _finish() (the
    eos case) we only drain, for _drain() triggered by segment seek or new
caps, we also reset the decoder state so it's ready to accept buffers.

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