[Bug 737984] New: schrodec: optimize parse logic

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=737984
  GStreamer | gst-plugins-bad | unspecified

           Summary: schrodec: optimize parse logic
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vineeth.tm at samsung.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Header will be read each and everytime parse function will be called
which is not necessary since until we have complete data,
we need not parse the header again.

Added a patch to check if the header is already parsed or not, and based on the
same skipping the header reading.
Please review the same.

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