[Bug 738069] New: waylandsink: avoid render twice the same buffer

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=738069
  GStreamer | gst-plugins-bad | 1.4.3

           Summary: waylandsink: avoid render twice the same buffer
    Classification: Platform
           Product: GStreamer
           Version: 1.4.3
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: benjamin.gaignard at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=287933)
 View: https://bugzilla.gnome.org/attachment.cgi?id=287933
 Review: https://bugzilla.gnome.org/review?bug=738069&attachment=287933

waylandsink: do not render twice the same buffer

Do not try to render a buffer that is already being rendered.

This happens typically during the initial rendering stage as the first
buffer is rendered twice: first by preroll(), then by render().
This commit avoids this assertion failure:
  CRITICAL: gst_wayland_compositor_acquire_buffer: assertion
  'meta->used_by_compositor == FALSE' failed

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