[rygel] core: be more robust while scanning metadata

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 1b26e5c642e946236207bf0784bf496c7d193e25
Author: Jens Georg <mail jensge org>
Date:   Wed Sep 23 15:35:43 2009 +0200

    core: be more robust while scanning metadata
    
     - Add a timeout to check for stuck/aborted scannings
     - Don't reuse playbin, this seems to be problematic

 src/rygel/rygel-metadata-extractor.vala |   69 ++++++++++++++++++++++---------
 1 files changed, 49 insertions(+), 20 deletions(-)
---
diff --git a/src/rygel/rygel-metadata-extractor.vala b/src/rygel/rygel-metadata-extractor.vala
index 4f71816..84414d7 100644
--- a/src/rygel/rygel-metadata-extractor.vala
+++ b/src/rygel/rygel-metadata-extractor.vala
@@ -64,7 +64,8 @@ public class Rygel.MetadataExtractor: GLib.Object {
     private TagList tag_list;
 
     private GLib.Queue<File> file_queue;
-    private Gst.Element[] fakesinks;
+
+    private uint timeout_id;
 
     private static void register_custom_tag (string tag, Type type) {
         Gst.tag_register (tag,
@@ -75,34 +76,40 @@ public class Rygel.MetadataExtractor: GLib.Object {
                           Gst.tag_merge_use_first);
     }
 
-    public MetadataExtractor () {
-        this.register_custom_tag (TAG_RYGEL_SIZE, typeof (int64));
-        this.register_custom_tag (TAG_RYGEL_DURATION, typeof (int64));
-        this.register_custom_tag (TAG_RYGEL_MIME, typeof (string));
-        this.register_custom_tag (TAG_RYGEL_CHANNELS, typeof (int));
-        this.register_custom_tag (TAG_RYGEL_RATE, typeof (int));
-        this.register_custom_tag (TAG_RYGEL_WIDTH, typeof (int));
-        this.register_custom_tag (TAG_RYGEL_HEIGHT, typeof (int));
-        this.register_custom_tag (TAG_RYGEL_DEPTH, typeof (int));
-        this.register_custom_tag (TAG_RYGEL_MTIME, typeof (uint64));
-
+    private void renew_playbin () {
         // setup fake sinks
         this.playbin = ElementFactory.make ("playbin2", null);
         if (this.playbin == null) {
             this.playbin = ElementFactory.make ("playbin", null);
         }
 
-        this.fakesinks = new Gst.Element[2];
-        this.fakesinks[0] = ElementFactory.make ("fakesink", null);
-        this.fakesinks[1] = ElementFactory.make ("fakesink", null);
-        this.playbin.video_sink = this.fakesinks[0];
-        this.playbin.audio_sink = this.fakesinks[1];
+        // increase reference count of sinks to workaround
+        // bug #596078
+        var sink = ElementFactory.make ("fakesink", null);
+        sink.ref ();
+        this.playbin.video_sink = sink;
+
+        sink = ElementFactory.make ("fakesink", null);
+        sink.ref ();
+        this.playbin.audio_sink = sink;
 
         var bus = this.playbin.get_bus ();
         bus.add_signal_watch ();
         bus.message["tag"] += this.tag_cb;
         bus.message["state-changed"] += this.state_changed_cb;
         bus.message["error"] += this.error_cb;
+    }
+
+    public MetadataExtractor () {
+        this.register_custom_tag (TAG_RYGEL_SIZE, typeof (int64));
+        this.register_custom_tag (TAG_RYGEL_DURATION, typeof (int64));
+        this.register_custom_tag (TAG_RYGEL_MIME, typeof (string));
+        this.register_custom_tag (TAG_RYGEL_CHANNELS, typeof (int));
+        this.register_custom_tag (TAG_RYGEL_RATE, typeof (int));
+        this.register_custom_tag (TAG_RYGEL_WIDTH, typeof (int));
+        this.register_custom_tag (TAG_RYGEL_HEIGHT, typeof (int));
+        this.register_custom_tag (TAG_RYGEL_DEPTH, typeof (int));
+        this.register_custom_tag (TAG_RYGEL_MTIME, typeof (uint64));
 
         this.file_queue = new GLib.Queue<File> ();
         this.tag_list = new Gst.TagList ();
@@ -116,12 +123,34 @@ public class Rygel.MetadataExtractor: GLib.Object {
         }
     }
 
+    private bool on_harvesting_timeout () {
+        warning ("Metadata extractor timed out on %s, restarting",
+               this.file_queue.peek_head ().get_uri ());
+        this.playbin.set_state (State.NULL);
+
+        this.error (file_queue.peek_head (),
+                    new IOChannelError.FAILED ("Pipeline stuck while reading file info"));
+        this.file_queue.pop_head ();
+        extract_next ();
+        return false;
+    }
+
     private void extract_next () {
+        if (this.timeout_id != 0)
+            Source.remove (this.timeout_id);
+
         if (this.file_queue.get_length () > 0) {
             try {
                 var item = this.file_queue.peek_head ();
-                this.extract_mime_and_size ();
+                debug ("Scheduling file %s for metadata extraction",
+                       item.get_uri ());
+               this.extract_mime_and_size ();
+                renew_playbin ();
                 this.playbin.uri = item.get_uri ();
+                this.timeout_id = Timeout.add_seconds_full (
+                                                         Priority.DEFAULT,
+                                                         5,
+                                                         on_harvesting_timeout);
                 this.playbin.set_state (State.PAUSED);
             } catch (Error error) {
                 // on error just move to the next uri in queue
@@ -241,9 +270,9 @@ public class Rygel.MetadataExtractor: GLib.Object {
     }
 
     private void extract_stream_info () {
-        extract_av_info (this.fakesinks[0].get_pad ("sink"),
+        extract_av_info (this.playbin.video_sink.get_pad ("sink"),
                 StreamType.VIDEO);
-        extract_av_info (this.fakesinks[1].get_pad ("sink"),
+        extract_av_info (this.playbin.audio_sink.get_pad ("sink"),
                 StreamType.AUDIO);
     }