[Bug 733827] v4l2videodec: Add pixel format negotiation support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=733827

Philipp Zabel <p.zabel at pengutronix.de> changed:

           What    |Removed                     |Added
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 Attachment #300587|needs-work                  |none
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 Attachment #300587|0                           |1
        is obsolete|                            |

--- Comment #18 from Philipp Zabel <p.zabel at pengutronix.de> ---
Created attachment 310501
  --> https://bugzilla.gnome.org/attachment.cgi?id=310501&action=edit
v4l2: videodec: choose format from caps

Now this creates a single structure caps from the info returned by
acquire_format, removes the format field from it, uses that as a filter to
probe_caps and queries peer caps with the result as a filter.
If the returned caps is empty, a negotiation failure is reported, otherwise a
SET_FMT is tried and if that succeeds, the original GstVideoInfo is replaced
from the negotioated caps.

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