videoparsers: Fix GstBaseParse::get_sink_caps() implementations

They should take the filter caps into account and always return
the template caps appended to the actual caps. Otherwise the
parsers stop to accept unparsed streams where upstream does not
know about width, height, etc.

Fixes bug #677401.

1 files changed, 11 insertions, 8 deletions

diff --git a/gst/videoparsers/gstmpeg4videoparse.c b/gst/videoparsers/gstmpeg4videoparse.c
index 9b7344f06..29caec7f5 100644
--- a/gst/videoparsers/gstmpeg4videoparse.c
+++ b/gst/videoparsers/gstmpeg4videoparse.c
@@ -767,10 +767,12 @@ gst_mpeg4vparse_set_caps (GstBaseParse * parse, GstCaps * caps)
 static GstCaps *
 gst_mpeg4vparse_get_caps (GstBaseParse * parse, GstCaps * filter)
 {
-  GstCaps *peercaps;
+  GstCaps *peercaps, *templ;
   GstCaps *res;
 
+  templ = gst_pad_get_pad_template_caps (GST_BASE_PARSE_SINK_PAD (parse));
   peercaps = gst_pad_get_allowed_caps (GST_BASE_PARSE_SRC_PAD (parse));
+
   if (peercaps) {
     guint i, n;
 
@@ -783,15 +785,16 @@ gst_mpeg4vparse_get_caps (GstBaseParse * parse, GstCaps * filter)
       gst_structure_remove_field (s, "parsed");
     }
 
-    res =
-        gst_caps_intersect_full (peercaps,
-        gst_pad_get_pad_template_caps (GST_BASE_PARSE_SRC_PAD (parse)),
-        GST_CAPS_INTERSECT_FIRST);
+    res = gst_caps_intersect_full (peercaps, templ, GST_CAPS_INTERSECT_FIRST);
     gst_caps_unref (peercaps);
+
+    /* Append the template caps because we still want to accept
+     * caps without any fields in the case upstream does not
+     * know anything.
+     */
+    gst_caps_append (res, templ);
   } else {
-    res =
-        gst_caps_copy (gst_pad_get_pad_template_caps (GST_BASE_PARSE_SINK_PAD
-            (parse)));
+    res = templ;
   }
 
   if (filter) {