avisubtitle: set caps on srcpad to fix issue with discoverer

Set caps from the start so discoverer doesn't blow up on
seeing no negotiated caps between elements on preroll,
which might happen if no subtitle buffers have been
pushed yet at the time. See file from bug #603308.

diff --git a/gst/avi/gstavisubtitle.c b/gst/avi/gstavisubtitle.c
index 38771c3..10c4faf 100644 (file)
--- a/gst/avi/gstavisubtitle.c
+++ b/gst/avi/gstavisubtitle.c
@@ -333,12 +333,20 @@ gst_avi_subtitle_class_init (GstAviSubtitleClass * klass)
 static void
 gst_avi_subtitle_init (GstAviSubtitle * self, GstAviSubtitleClass * klass)
 {
+  GstCaps *caps;
+
   self->src = gst_pad_new_from_static_template (&src_template, "src");
   gst_element_add_pad (GST_ELEMENT (self), self->src);
 
   self->sink = gst_pad_new_from_static_template (&sink_template, "sink");
   gst_pad_set_chain_function (self->sink,
       GST_DEBUG_FUNCPTR (gst_avi_subtitle_chain));
+
+  caps = gst_static_pad_template_get_caps (&src_template);
+  gst_pad_set_caps (self->src, caps);
+  gst_caps_unref (caps);
+
+  gst_pad_use_fixed_caps (self->src);
   gst_element_add_pad (GST_ELEMENT (self), self->sink);
 
   self->subfile = NULL;