[Bug 740557] New: Feature: video_test_src_ball motion based on system clock

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740557
  GStreamer | gst-plugins-base | git

           Summary: Feature: video_test_src_ball  motion based on system
                    clock
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: carl at personnelware.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


video_test_src_ball moves around in a flowy pattern that is nice to look at. 
(personally I don't want to get rid of that, see below.)

in a nutshell:

gettimeofday (&tv, NULL);
rad = 1 * G_PI * tv.tv_usec/1000000 ;
x = w/2 + sin(rad) * (radius);

The ball revolves around the center of the frame, one revolution per second, or
1/2 a revolution then jumps back to the start as the second increases.

Adding clock seconds:
clockoverlay time-format="%S" font-desc="Sans 240"

makes a very nice way of testing sync that I need for a gstreamer app I am
working on.

I stepped on the original ball behaviour code because much of the function was
unchanged and I didn't want to  cut/paste big hunks of code, nor get tangled up
in how to abstract out the common code into it's own function.   I would like
some guidance on how to address this, both what direction to go (ignore
previous behaviour, copy the common code, put the common code in a function
(where does that go?)  add a parameter that defines what ball behaviour to
use...)   or if someone else wants to just do it, that would be fine with me.

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