[Bug 735404] New: Feature Submission: Added XSync support to xvimagesink

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=735404
  GStreamer | gst-plugins-base | git

           Summary: Feature Submission: Added XSync support to xvimagesink
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: swestrup at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=284445)
 View: https://bugzilla.gnome.org/attachment.cgi?id=284445
 Review: https://bugzilla.gnome.org/review?bug=735404&attachment=284445

Patch to implement xsync support in xvimagesink

There is an X Server extension called XSync which allows for synchronizing X
operations against an external clock. Under Linux the default 'SERVERTIME'
clock is a monotonic clock shared by all servers on a linux box, allowing for
synchronization between independent X Servers running on a single machine.

To make use of this feature, I've added 'xsync' and 'xsync-clock' properties to
xvimagesink. If xsync is true, then whenever xvimagesink would normally
synchronize frames, it will attempt to do so using the XSync clock named in
'xsync-clock'

I've added this features in order to help support videowall software that needs
multiple X Servers to show frames at the same moment.

This is my first attempt at modifying the internals of a complex sink like
xvimagesink, and I may have made some mistakes, but the code currently appears
to operate as expected.

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