[DllImport ("libgstvideo-0.10.dll") ]
static extern IntPtr gst_video_frame_rate (IntPtr pad);

public static Gst.Fraction GetFrameRate (Gst.Pad pad) {
  IntPtr raw_ret = gst_video_frame_rate (pad == null ? IntPtr.Zero : pad.Handle);
  if (raw_ret == IntPtr.Zero)
    return new Gst.Fraction ();

  Gst.GLib.Value ret = (Gst.GLib.Value) Marshal.PtrToStructure (raw_ret, typeof (Gst.GLib.Value));
  return (Gst.Fraction) ret.Val;
}

[DllImport ("libgstvideo-0.10.dll") ]
static extern uint gst_video_format_to_fourcc (int format);

public static Gst.Fourcc FormatToFourcc (Gst.Video.VideoFormat format) {
  uint raw_ret = gst_video_format_to_fourcc ( (int) format);
  uint ret = raw_ret;
  return new Gst.Fourcc (ret);
}

public static Gst.Video.VideoFormat FormatFromFourcc (Gst.Fourcc fourcc) {
  return FormatFromFourcc (fourcc.Val);
}

[DllImport ("gstreamersharpglue-0.10.dll") ]
static extern IntPtr gstsharp_gst_videoutil_get_template_caps (Gst.Video.VideoFormat fmt);

public static Gst.Caps FormatToTemplateCaps (Gst.Video.VideoFormat fmt) {
  IntPtr raw_ret = gstsharp_gst_videoutil_get_template_caps (fmt);
  if (raw_ret == IntPtr.Zero)
    return null;

  return (Gst.Caps) Gst.GLib.Opaque.GetOpaque (raw_ret, typeof (Gst.Caps), true);
}