[Bug 704760] opencv: disparity-map calculation element

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704760
  GStreamer | gst-plugins-bad | 1.x

--- Comment #8 from Sebastian Dröge (slomo) <slomo at circular-chaos.org> 2013-07-30 08:57:08 UTC ---
(In reply to comment #6)

> BUT: Still don't see the caps negotiation clearly :(
>  I tried forcing the caps on both src and the other sink when there is a
> sink_event, but then the negotiation doesn't work out. Help! :'(

What you would do is something like the following:

sink_query(CAPS):
 - If !gst_pad_has_current_caps(srcpad):
     return gst_pad_get_template_caps(pad);
 - else:
     return gst_pad_get_current_caps(srcpad);

sink_event(CAPS):
  - if !gst_pad_has_current_caps(srcpad):
      gst_pad_set_caps(srcpad, caps);
  - else if !gst_caps_is_equal(gst_pad_get_current_caps(srcpad), caps):
      fail();
  - else:
      succeed();

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