[gstreamer-bugs] [Bug 588744] New: [check] Stream consistency checker utility

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gstreamer (core) | Ver: git
           Summary: [check] Stream consistency checker utility
           Product: GStreamer
           Version: git
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: bilboed at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


Many elements don't have any checks (whether internally or in the unit tests)
to make sure that the outgoing data flow is consistant.

* No in-band data (buffers or events) are sent before NEWSEGMENT
* NEWSEGMENT is sent out after a FLUSH_START/FLUSH_STOP tuple
* Only *ONE* FLUSH_STOP follows a FLUSH_START
* No in-band data (buffers or events) are sent after EOS
* No in-band data (buffers or events) are sent between FLUSH_START and
FLUSH_STOP
* ... maybe some more

For this I've created a StreamConsistency helper utility for libgstcheck which
can be used in various unit tests. This has already helped detect a few bugs in
some elements.

Doing this is very important for dynamic pipelines (in general and GNonLin ones
in particular) where a certain data flow consistency is expected.


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