[Bug 796681] v4l2videodec: do not call streamon while pool is flushing

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796681

--- Comment #2 from Michael Tretter <m.tretter at pengutronix.de> ---
Created attachment 372854
  --> https://bugzilla.gnome.org/attachment.cgi?id=372854&action=edit
trickmode-key-units.scenario

Use the attached trickmode-key-units.scenario with the following pipeline. The
used video does not matter.

gst-validate-1.0 --set-scenario trickmode-key-units filesrc
location=<some_h264_encoded_video> ! parsebin ! v4l2h264dec ! fakesink

Decoding will sometimes, but not always, fail with the following error message.

gstv4l2bufferpool.c:1032:gst_v4l2_buffer_pool_poll:<v4l2h264dec0> error: poll
error 1: Broken pipe (32)

The poll fails, because capture is streaming, but its buffer list is empty,
because the v4l2videodec did not resurrect the buffers. The patch fixes the
buffer resurrection in v4l2videodec.

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