[Bug 740003] New: pad: fail drop queries

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740003
  GStreamer | gstreamer (core) | git

           Summary: pad: fail drop queries
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vincent.penquerch at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=290501)
 View: https://bugzilla.gnome.org/attachment.cgi?id=290501
 Review: https://bugzilla.gnome.org/review?bug=740003&attachment=290501

drop failed queries

Previously, dropping a query from a pad probe would deem the
query succeeded, and the caller might then assume the query's
results are valid, and thus dereference an invalid object
such as a GstCaps.

We now assume dropped queries did not succeed. Dropped events
and buffers are still deemed a success.

This patch might break expectations from some client code (ie, failure causing
something upstream to stop the pipeline) ?

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