[Bug 764673] blacklist unsupported backend drivers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764673

Víctor Manuel Jáquez Leal <vjaquez at igalia.com> changed:

           What    |Removed                     |Added
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 Attachment #326499|0                           |1
        is obsolete|                            |

--- Comment #13 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 326502
  --> https://bugzilla.gnome.org/attachment.cgi?id=326502&action=edit
vaapidecode: search driver in whitelist

If the backend driver vendor string is not in a white-list, and the
environment variable GST_VAAPI_ALL_DRIVERS is not set either, the decoder will
change it state from NULL to READY, hence the auto-plug mechanism will look
for another decoder.

This patch assumes the GstContext has already being shared along the pipeline
and the element has a valid GstVaapiDisplay instance.

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