[Bug 764316] vaapidecode: simplify downstream negotiation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764316

--- Comment #20 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to sreerenj from comment #19)
> Okay, let me try to give one example where your patch is going to fail ;)
> 
> surface_resolution: 640x480
> crop_rectangle: 320x240
> 
> everything is working fine...
> now in the middle there is a surface resolution change:
> 
> new_surface_resolution: 1280x720
> new_crop_rectangle: 320x240
> 
> here the crop_values are the same, but actual surface dimension get changed.
> As per what i can see from the patch, the code will not try negotiate the
> pool in gstvaapidecode even though it get negotiated inside libgstvaapi.

Nice catch!

I will rework the patch :)

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