[Bug 788006] New: audiobasesink: Fix clock skew adjustments

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788006

            Bug ID: 788006
           Summary: audiobasesink: Fix clock skew adjustments
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gstblub at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 360208
  --> https://bugzilla.gnome.org/attachment.cgi?id=360208&action=edit
audiobasesink: Fix clock skew corrections

The external time should be moved only as much as needed
to get back to the ideal center point, so that the clock
is still allowed to drift both directions after the correction.
This fixes excessive back and forth corrections due to the
assumption of a linear drift.

This also allowed me to reduce the clock skew tolerance dramatically without
introducing more corrections.

Bug #722259 may be to some extent also be caused by this bug.  The enhancement
bug #769804 still makes sense in combination with this fix.

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