[Bug 783301] New: appsrc: Should not set caps intide GstBaseSrcClass::create

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783301

            Bug ID: 783301
           Summary: appsrc: Should not set caps intide
                    GstBaseSrcClass::create
    Classification: Platform
           Product: GStreamer
           Version: 1.8.2
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 352965
  --> https://bugzilla.gnome.org/attachment.cgi?id=352965&action=edit
Test the demonstrate the issue

Inside the virtual method ::create() the live lock is held. As pushing caps may
block on a queue, or on some downstream element doing allocation query toward a
queue, this can lead to yet another appsrc deadlock.

I'm attaching an example application to demonstrate one way to trigger a
deadlock. I do believe this could be reproduce with just one appsrc, two sinks
and a queue, but the initial bug was reported to me with a similar setup to
this test.

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