interlace: Writing field-order into the src caps

Writing top-field-first vs bottom-field-first into the src caps

https://bugzilla.gnome.org/show_bug.cgi?id=775409

diff --git a/gst/interlace/gstinterlace.c b/gst/interlace/gstinterlace.c
index 88e68c0..bf140b5 100644 (file)
--- a/gst/interlace/gstinterlace.c
+++ b/gst/interlace/gstinterlace.c
@@ -408,6 +408,11 @@ gst_interlace_setcaps (GstInterlace * interlace, GstCaps * caps)
     interlace->passthrough = FALSE;
     gst_caps_set_simple (othercaps, "framerate", GST_TYPE_FRACTION,
         interlace->src_fps_n, interlace->src_fps_d, NULL);
+    if (interlace->pattern <= GST_INTERLACE_PATTERN_2_2) {
+      gst_caps_set_simple (othercaps, "field-order", G_TYPE_STRING,
+          interlace->top_field_first ? "top-field-first" : "bottom-field-first",
+          NULL);
+    }
   }
 
   ret = gst_pad_set_caps (interlace->srcpad, othercaps);