[Bug 793271] v4l2object: Check for all allocators and pools in query

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793271

Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> changed:

           What    |Removed                     |Added
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 Attachment #368132|none                        |needs-work
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--- Comment #7 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Review of attachment 368132:
 --> (https://bugzilla.gnome.org/review?bug=793271&attachment=368132)

The main problem with this patch is that it's not backward compatible. We have
kmssink that export a pool the produce DMABuf, without modifying kmssink, the
following pipeline will not work any-more:

  v4l2src io-mode=dmabuf-import ! kmssink

This is because the code will no longer consider any pool that does not have
the new option.

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