Created attachment 235373 [details] [review]
Memory leak fix.

static gboolean
gst_videomixer2_query_caps (GstPad * pad, GstObject * parent, GstQuery * query)
{
  GstCaps *filter, *caps;
  GstVideoMixer2 *mix = GST_VIDEO_MIXER2 (parent);
  GstStructure *s;
  gint n;

  gst_query_parse_caps (query, &filter);

  if (GST_VIDEO_INFO_FORMAT (&mix->info) != GST_VIDEO_FORMAT_UNKNOWN) {
    caps = gst_pad_get_current_caps (mix->srcpad);
  } else {
    caps = gst_pad_get_pad_template_caps (mix->srcpad);
  }

  caps = gst_caps_make_writable (caps);

  n = gst_caps_get_size (caps) - 1;
  for (; n >= 0; n--) {
    s = gst_caps_get_structure (caps, n);
    gst_structure_set (s, "width", GST_TYPE_INT_RANGE, 1, G_MAXINT,
        "height", GST_TYPE_INT_RANGE, 1, G_MAXINT, NULL);
    if (GST_VIDEO_INFO_FPS_D (&mix->info) != 0) {
      gst_structure_set (s,
          "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1, NULL);
    }
  }
  gst_query_set_caps_result (query, caps);
  return TRUE;
}