[rygel] media-export: Work around a problem in playbin2

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 6366b58decb2d81dc4def25e7a22813882e86428
Author: Jens Georg <mail jensge org>
Date:   Thu May 6 23:39:21 2010 +0200

    media-export: Work around a problem in playbin2
    
    Sometimes playbin2 fails to extract the duration right after the state
    change.

 .../rygel-media-export-metadata-extractor.vala     |   25 +++++++++++++++++++-
 1 files changed, 24 insertions(+), 1 deletions(-)
---
diff --git a/src/plugins/media-export/rygel-media-export-metadata-extractor.vala b/src/plugins/media-export/rygel-media-export-metadata-extractor.vala
index d8f50d5..13b7512 100644
--- a/src/plugins/media-export/rygel-media-export-metadata-extractor.vala
+++ b/src/plugins/media-export/rygel-media-export-metadata-extractor.vala
@@ -96,7 +96,11 @@ public class Rygel.MediaExportMetadataExtractor: GLib.Object {
         var bus = this.playbin.get_bus ();
         bus.add_signal_watch ();
         bus.message["tag"] += this.tag_cb;
-        bus.message["state-changed"] += this.state_changed_cb;
+        if (factory.get_element_type ().name () == "GstPlayBin2") {
+            bus.message["element"] += this.element_message_cb;
+        } else {
+            bus.message["state-changed"] += this.state_changed_cb;
+        }
         bus.message["error"] += this.error_cb;
     }
 
@@ -194,6 +198,25 @@ public class Rygel.MediaExportMetadataExtractor: GLib.Object {
                                             TagMergeMode.REPLACE);
     }
 
+    private void element_message_cb (Bus     bus,
+                                     Message message) {
+        if (message.src != this.playbin) {
+            return;
+        }
+
+        if (message.structure.get_name () == "playbin2-stream-changed") {
+            this.extract_duration ();
+            this.extract_stream_info ();
+
+            /* No hopes of getting any tags after this point */
+            this.extraction_done (this.file_queue.peek_head (), tag_list);
+            this.playbin.set_state (State.NULL);
+            this.tag_list = new Gst.TagList ();
+            this.file_queue.pop_head ();
+            this.extract_next ();
+        }
+    }
+
     /* Callback for state-change in playbin */
     private void state_changed_cb (Gst.Bus     bus,
                                    Gst.Message message) {