[Bug 782135] New: filesink/basesink: gst_element_query() for QUERY_URI on a filesink fails

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782135

            Bug ID: 782135
           Summary: filesink/basesink: gst_element_query() for QUERY_URI
                    on a filesink fails
    Classification: Platform
           Product: GStreamer
           Version: 1.10.0
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: brendan.shanks at teradek.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I'm trying to do a GST_QUERY_URI on a filesink using gst_element_query(), but
the query is never handled and fails. (It's actually on a bin containing a
filesink, but I don't think that matters).
GstBaseSink's default_element_query() handles the query, and defaults to doing
gst_pad_peer_query(). This sends the query upstream through the muxer, parser,
etc., but the filesink itself never gets to answer.
filesink implements GstBaseSink::query() and handles GST_QUERY_URI there, but
it looks like basesink only calls that for a pad query, not element query.

I can query the bin's sink pad instead, but gst_element_query(filesink,
GST_QUERY_URI) seems like something that should work. Is this the case?

Relevant debug lines:
GST_ELEMENT_PADS gstelement.c:1707:gst_element_query: send query on element
tdstream0
bin gstbin.c:4376:gst_bin_query:<tdstream0> Sending query 0x29c6c0 (type uri)
to sink children
GST_ELEMENT_PADS gstelement.c:1707:gst_element_query: send query on element
filesink
GST_PADS gstpad.c:4059:gst_pad_peer_query:<filesink:sink> peer query 0x29c6c0
(uri)
GST_PADS gstpad.c:3932:gst_pad_query:<muxer:src> doing query 0x29c6c0 (uri)
GST_PADS gstpad.c:3376:gst_pad_query_default:<muxer:src> forwarding 0x29c6c0
(uri) query
GST_PADS gstpad.c:2836:gst_pad_iterate_internal_links_default:<muxer:src>
Making iterator
GST_PADS gstpad.c:4059:gst_pad_peer_query:<muxer:video_0> peer query 0x29c6c0
(uri)
GST_PADS gstpad.c:3932:gst_pad_query:<parser:src> doing query 0x29c6c0 (uri)
GST_PADS gstpad.c:3376:gst_pad_query_default:<parser:src> forwarding 0x29c6c0
(uri) query
GST_PADS gstpad.c:2836:gst_pad_iterate_internal_links_default:<parser:src>
Making iterator
GST_PADS gstpad.c:4059:gst_pad_peer_query:<parser:sink> peer query 0x29c6c0
(uri)
... queries all the way to the src

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