[Bug 740557] videotestsrc: add ball motion based on system clock

[GStreamer (bugzilla.gnome.org)]

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

--- Comment #21 from carl at personnelware.com 2014-12-01 04:50:38 UTC ---
I am not sure where to get running-time from. 

I took a look at the timeovelay and saw 
gst_time_overlay_get_text (GstBaseTextOverlay * overlay,  GstBuffer *
video_frame)

GstClockTime time = GST_BUFFER_TIMESTAMP (video_frame);

I am guessing video_frame is gst_video_test_src_ball (GstVideoTestSrc * v,
GstVideoFrame * frame)

I tried to use frame, but that didn't seem to work:

      time = GST_BUFFER_TIMESTAMP (frame);
      if (GST_CLOCK_TIME_IS_VALID (time)) {
        secs = (guint) ((time / GST_SECOND) % 60); 
        msecs = (guint) ((time % GST_SECOND) / (1000 * 1000));
      } else {
        GST_DEBUG ("buffer without valid timestamp");
        secs = 0; 
        msecs = 0; 
      }    
      rad = 2 * G_PI * msecs;

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