[Bug 764316] vaapidecode: simplify downstream negotiation

[GStreamer (GNOME Bugzilla)]

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

--- Comment #27 from sreerenj <bsreerenj at gmail.com> ---
Review of attachment 325738:
 --> (https://bugzilla.gnome.org/review?bug=764316&attachment=325738)

::: gst/vaapi/gstvaapidecode.c
@@ +390,3 @@
+    /* allocation caps changes if cropping differs */
+    alloc_changed = output_width != surface_width
+        || output_height != surface_height;

Are you intended to keep allocation_width/allocation_height zero until there is
resolution change?

if state==NULL && output_width == surface_width && output_height ==
surface_height
  then decode->allocation_width = decode->allocation_height = 0

which is misleading...

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