gst/decodebin2: Ensure we get fixed caps for topology message

There are some corner cases (like with dvdemux amongst others) where
the caps won't be negotiated, but the pad has fixed caps.

diff --git a/gst/playback/gstdecodebin2.c b/gst/playback/gstdecodebin2.c
index b8ca93f..59e6910 100644 (file)
--- a/gst/playback/gstdecodebin2.c
+++ b/gst/playback/gstdecodebin2.c
@@ -2551,6 +2551,15 @@ gst_decode_chain_get_topology (GstDecodeChain * chain)
 
   /* Caps that resulted in this chain */
   caps = gst_pad_get_negotiated_caps (chain->pad);
+  if (!caps) {
+    caps = gst_pad_get_caps (chain->pad);
+    if (G_UNLIKELY (!gst_caps_is_fixed (caps))) {
+      GST_ERROR_OBJECT (chain->pad,
+          "Couldn't get fixed caps, got %" GST_PTR_FORMAT, caps);
+      gst_caps_unref (caps);
+      caps = NULL;
+    }
+  }
   gst_structure_set (u, "caps", GST_TYPE_CAPS, caps, NULL);
   gst_caps_unref (caps);