interlace: fix negotiation if filter caps are passed to query_caps

Make videotestsrc ! interlace ! $anything work again. Problem
was that upstream filter caps were passed which contained
interlace-mode=progressive, which doesn't intersect too well
with interlace's source pad template caps, leading to
not-negotiated errors.

1 files changed, 18 insertions, 4 deletions

diff --git a/gst/interlace/gstinterlace.c b/gst/interlace/gstinterlace.c
index 8917f6f10..c503abf15 100644
--- a/gst/interlace/gstinterlace.c
+++ b/gst/interlace/gstinterlace.c
@@ -501,14 +501,25 @@ gst_interlace_getcaps (GstPad * pad, GstInterlace * interlace, GstCaps * filter)
   GstPad *otherpad;
   GstCaps *othercaps, *tcaps;
   GstCaps *icaps;
+  GstCaps *clean_filter = NULL;
   const char *mode;
+  guint i;
 
   otherpad =
       (pad == interlace->srcpad) ? interlace->sinkpad : interlace->srcpad;
 
-  tcaps = gst_pad_get_pad_template_caps (otherpad);
-  othercaps = gst_pad_peer_query_caps (otherpad, filter);
+  if (filter != NULL) {
+    clean_filter = gst_caps_copy (filter);
+    for (i = 0; i < gst_caps_get_size (clean_filter); ++i) {
+      GstStructure *s;
+
+      s = gst_caps_get_structure (clean_filter, i);
+      gst_structure_remove_field (s, "interlace-mode");
+    }
+  }
 
+  tcaps = gst_pad_get_pad_template_caps (otherpad);
+  othercaps = gst_pad_peer_query_caps (otherpad, clean_filter);
   if (othercaps) {
     icaps = gst_caps_intersect (othercaps, tcaps);
     gst_caps_unref (othercaps);
@@ -516,8 +527,8 @@ gst_interlace_getcaps (GstPad * pad, GstInterlace * interlace, GstCaps * filter)
     icaps = tcaps;
   }
 
-  if (filter) {
-    othercaps = gst_caps_intersect (icaps, filter);
+  if (clean_filter) {
+    othercaps = gst_caps_intersect (icaps, clean_filter);
     gst_caps_unref (icaps);
     icaps = othercaps;
   }
@@ -533,6 +544,9 @@ gst_interlace_getcaps (GstPad * pad, GstInterlace * interlace, GstCaps * filter)
 
   gst_caps_unref (tcaps);
 
+  if (clean_filter)
+    gst_caps_unref (clean_filter);
+
   return icaps;
 }