GtkObject
  GtkWidget
    GtkRange
    GtkContainer
  GstObject
    GstElement
      GstBin
        GstPipeline
        GstThread
      GstFilter
        GstTee
        GstIdentity
      GstSink
        GstFakeSink
        GstAudioSink
        GstFdSink
      GstSrc
        GstFakeSrc
        GstDiskSrc
        GstAsyncDiskSrc
        GstHttpSrc
        GstFdSrc
        GstAudioSrc
        GstSineSrc
      GstConnection
        GstQueue
    GstPad