public double GetVolume(Gst.Audio.StreamVolumeFormat format)
        {
            double raw_ret = gst_stream_volume_get_volume(Handle, (int)format);
            double ret     = raw_ret;

            return(ret);
        }
        public static double ConvertVolume(Gst.Audio.StreamVolumeFormat from, Gst.Audio.StreamVolumeFormat to, double val)
        {
            double raw_ret = gst_stream_volume_convert_volume((int)from, (int)to, val);
            double ret     = raw_ret;

            return(ret);
        }
 public void SetVolume(Gst.Audio.StreamVolumeFormat format, double val)
 {
     gst_stream_volume_set_volume(Handle, (int)format, val);
 }