Index: gst/playback/Makefile.am
===================================================================
RCS file: /cvs/gstreamer/gst-plugins-base/gst/playback/Makefile.am,v
retrieving revision 1.10
diff -u -p -r1.10 Makefile.am
--- gst/playback/Makefile.am	18 Oct 2005 17:13:56 -0000	1.10
+++ gst/playback/Makefile.am	3 Nov 2006 16:24:10 -0000
@@ -7,7 +7,7 @@ built_headers = gstplay-marshal.h
 
 plugindir = $(libdir)/gstreamer-@GST_MAJORMINOR@
 
-plugin_LTLIBRARIES = libgstplaybin.la libgstdecodebin.la
+plugin_LTLIBRARIES = libgstplaybin.la libgstdecodebin.la libgstdecodebin2.la
 
 libgstplaybin_la_SOURCES = \
 	gstplaybin.c \
@@ -26,6 +26,12 @@ libgstdecodebin_la_CFLAGS = $(GST_CFLAGS
 libgstdecodebin_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 libgstdecodebin_la_LIBADD = $(GST_LIBS)
 
+libgstdecodebin2_la_SOURCES = gstdecodebin2.c
+nodist_libgstdecodebin2_la_SOURCES = $(built_sources)
+libgstdecodebin2_la_CFLAGS = $(GST_CFLAGS)
+libgstdecodebin2_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+libgstdecodebin2_la_LIBADD = $(GST_LIBS)
+
 noinst_HEADERS = \
 	gstplaybasebin.h \
 	gststreaminfo.h \
Index: gst/playback/gstdecodebin2.c
===================================================================
RCS file: gst/playback/gstdecodebin2.c
diff -N gst/playback/gstdecodebin2.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ gst/playback/gstdecodebin2.c	3 Nov 2006 16:24:11 -0000
@@ -0,0 +1,1643 @@
+/* GStreamer
+ * Copyright (C) <2006> Edward Hervey <edward@fluendo.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <string.h>
+#include <gst/gst.h>
+
+#include "gstplay-marshal.h"
+
+/* generic templates */
+static GstStaticPadTemplate decoder_bin_sink_template =
+GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS_ANY);
+
+static GstStaticPadTemplate decoder_bin_src_template =
+GST_STATIC_PAD_TEMPLATE ("src%d",
+    GST_PAD_SRC,
+    GST_PAD_SOMETIMES,
+    GST_STATIC_CAPS_ANY);
+
+GST_DEBUG_CATEGORY_STATIC (gst_decode_bin_debug);
+#define GST_CAT_DEFAULT gst_decode_bin_debug
+
+typedef struct _GstDecodeGroup GstDecodeGroup;
+typedef struct _GstDecodePad GstDecodePad;
+typedef struct _GstDecodeBin GstDecodeBin;
+typedef struct _GstDecodeBinClass GstDecodeBinClass;
+
+#define GST_TYPE_DECODE_BIN             (gst_decode_bin_get_type())
+#define GST_DECODE_BIN(obj)             (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DECODE_BIN,GstDecodeBin))
+#define GST_DECODE_BIN_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_DECODE_BIN,GstDecodeBinClass))
+#define GST_IS_DECODE_BIN(obj)          (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DECODE_BIN))
+#define GST_IS_DECODE_BIN_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DECODE_BIN))
+
+struct _GstDecodeBin
+{
+  GstBin bin;                   /* we extend GstBin */
+
+  GstElement *typefind;         /* this holds the typefind object */
+  GstElement *fakesink;  
+
+  GMutex *lock;			/* Protects activegroup and groups */
+  GstDecodeGroup *activegroup;	/* group currently active */
+  GList *groups;		/* List of non-active GstDecodeGroups, sorted in
+				 * order of creation. */
+  gint nbpads;			/* unique identifier for source pads */
+
+  GList *factories;             /* factories we can use for selecting elements */
+};
+
+struct _GstDecodeBinClass
+{
+  GstBinClass parent_class;
+
+  /* signal we fire when a new pad has been decoded into raw audio/video */
+  void (*new_decoded_pad) (GstElement * element, GstPad * pad, gboolean last);
+  /* signal we fire when a pad has been removed */
+  void (*removed_decoded_pad) (GstElement * element, GstPad * pad);
+  /* signal fired when we found a pad that we cannot decode */
+  void (*unknown_type) (GstElement * element, GstPad * pad, GstCaps * caps);
+  /* signal fired to know if we continue trying to decode the given caps */
+  gboolean (*autoplug_continue) (GstElement * element, GstCaps * caps);
+  /* signal fired to reorder the proposed list of factories */
+  gboolean (*autoplug_sort) (GstElement * element, GstCaps * caps, GList **list);
+};
+
+/* signals */
+enum
+{
+  SIGNAL_NEW_DECODED_PAD,
+  SIGNAL_REMOVED_DECODED_PAD,
+  SIGNAL_UNKNOWN_TYPE,
+  SIGNAL_AUTOPLUG_CONTINUE,
+  SIGNAL_AUTOPLUG_SORT,
+  LAST_SIGNAL
+};
+
+static GstBinClass *parent_class;
+static guint gst_decode_bin_signals[LAST_SIGNAL] = { 0 };
+
+static const GstElementDetails gst_decode_bin_details =
+GST_ELEMENT_DETAILS ("Decoder Bin",
+    "Generic/Bin/Decoder",
+    "Autoplug and decode to raw media",
+    "Edward Hervey <edward@fluendo.com>");
+
+
+static void add_fakesink (GstDecodeBin * decode_bin);
+static void remove_fakesink (GstDecodeBin * decode_bin);
+
+static void type_found (GstElement * typefind, guint probability,
+			GstCaps * caps, GstDecodeBin * decode_bin);
+
+static gboolean gst_decode_bin_autoplug_continue (GstElement * element, GstCaps * caps);
+static gboolean gst_decode_bin_autoplug_sort (GstElement * element, GstCaps * caps,
+					      GList ** list);
+static GstPad *find_sink_pad (GstElement * element);
+static GstStateChangeReturn gst_decode_bin_change_state (GstElement * element,
+    GstStateChange transition);
+
+#define DECODE_BIN_LOCK(dbin) G_STMT_START {				\
+    GST_LOG_OBJECT (dbin,						\
+		    "locking from thread %p",				\
+		    g_thread_self ());					\
+    g_mutex_lock (dbin->lock);						\
+    GST_LOG_OBJECT (dbin,						\
+		    "locked from thread %p",				\
+		    g_thread_self ());					\
+} G_STMT_END
+
+#define DECODE_BIN_UNLOCK(dbin) G_STMT_START {				\
+    GST_LOG_OBJECT (dbin,						\
+		    "unlocking from thread %p",				\
+		    g_thread_self ());					\
+    g_mutex_unlock (dbin->lock);					\
+} G_STMT_END
+
+/* GstDecodeGroup
+ *
+ * Streams belonging to the same group/chain of a media file
+ *
+ */
+
+struct _GstDecodeGroup
+{
+  GstDecodeBin * dbin;
+  GMutex *lock;
+  GstElement * multiqueue;
+  gboolean exposed;		/* TRUE if this group is exposed */
+  gboolean drained;		/* TRUE if EOS went throug all endpads */
+  gboolean blocked;		/* TRUE if all endpads are blocked */
+  gboolean complete;		/* TRUE if we are not expecting anymore streams 
+				 * on this group */
+  GList * endpads;		/* List of GstDecodePad of source pads to be exposed */
+  GList * ghosts;		/* List of GstGhostPad for the endpads */
+};
+
+#define GROUP_MUTEX_LOCK(group) G_STMT_START {				\
+    GST_LOG_OBJECT (group->dbin,					\
+		    "locking group %p from thread %p",			\
+		    group, g_thread_self ());				\
+    g_mutex_lock (group->lock);						\
+    GST_LOG_OBJECT (group->dbin,					\
+		    "locked group %p from thread %p",			\
+		    group, g_thread_self ());				\
+} G_STMT_END
+
+#define GROUP_MUTEX_UNLOCK(group) G_STMT_START {                        \
+    GST_LOG_OBJECT (group->dbin,					\
+		    "unlocking group %p from thread %p",		\
+		    group, g_thread_self ());				\
+    g_mutex_unlock (group->lock);					\
+} G_STMT_END
+
+
+static GstDecodeGroup * gst_decode_group_new (GstDecodeBin * decode_bin);
+static GstPad * gst_decode_group_control_demuxer_pad (GstDecodeGroup * group, GstPad * pad);
+static gboolean gst_decode_group_control_source_pad (GstDecodeGroup * group, GstPad * pad);
+static gboolean gst_decode_group_expose (GstDecodeGroup * group);
+static void gst_decode_group_check_if_blocked (GstDecodeGroup * group);
+static void gst_decode_group_set_complete (GstDecodeGroup * group);
+static void gst_decode_group_hide (GstDecodeGroup * group);
+static void gst_decode_group_free (GstDecodeGroup * group);
+
+/* GstDecodePad
+ *
+ * GstPad private used for source pads of groups
+ */
+
+struct _GstDecodePad
+{
+  GstPad * pad;
+  GstDecodeGroup * group;
+  gboolean blocked;
+  gboolean drained;
+};
+
+static GstDecodePad * gst_decode_pad_new (GstDecodeGroup * group, GstPad * pad, gboolean block);
+static void source_pad_blocked_cb (GstPad * pad, gboolean blocked, GstDecodePad * dpad);
+
+/********************************
+ * Standard GObject boilerplate *
+ ********************************/
+
+static void gst_decode_bin_class_init (GstDecodeBinClass * klass);
+static void gst_decode_bin_init (GstDecodeBin * decode_bin);
+static void gst_decode_bin_dispose (GObject * object);
+static void gst_decode_bin_finalize (GObject * object);
+
+static GType
+gst_decode_bin_get_type (void)
+{
+  static GType gst_decode_bin_type = 0;
+
+  if (!gst_decode_bin_type) {
+    static const GTypeInfo gst_decode_bin_info = {
+      sizeof (GstDecodeBinClass),
+      NULL,
+      NULL,
+      (GClassInitFunc) gst_decode_bin_class_init,
+      NULL,
+      NULL,
+      sizeof (GstDecodeBin),
+      0,
+      (GInstanceInitFunc) gst_decode_bin_init,
+      NULL
+    };
+
+    gst_decode_bin_type =
+        g_type_register_static (GST_TYPE_BIN, "GstDecodeBin2",
+        &gst_decode_bin_info, 0);
+  }
+
+  return gst_decode_bin_type;
+}
+
+static gboolean
+_gst_boolean_accumulator (GSignalInvocationHint * ihint,
+    GValue * return_accu, const GValue * handler_return, gpointer dummy)
+{
+  gboolean myboolean;
+
+  myboolean = g_value_get_boolean (handler_return);
+  if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
+    g_value_set_boolean (return_accu, myboolean);
+
+  /* stop emission if FALSE */
+  return myboolean;
+}
+
+static void
+gst_decode_bin_class_init (GstDecodeBinClass * klass)
+{
+  GObjectClass * gobject_klass;
+  GstElementClass *gstelement_klass;
+  GstBinClass *gstbin_klass;
+
+  gobject_klass = (GObjectClass *) klass;
+  gstelement_klass = (GstElementClass *) klass;
+  gstbin_klass = (GstBinClass *) klass;
+
+  parent_class = g_type_class_peek_parent (klass);
+
+  gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD] =
+      g_signal_new ("new-decoded-pad", G_TYPE_FROM_CLASS (klass),
+      G_SIGNAL_RUN_LAST,
+      G_STRUCT_OFFSET (GstDecodeBinClass, new_decoded_pad), NULL, NULL,
+      gst_play_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 2, GST_TYPE_PAD,
+      G_TYPE_BOOLEAN);
+  gst_decode_bin_signals[SIGNAL_REMOVED_DECODED_PAD] =
+      g_signal_new ("removed-decoded-pad", G_TYPE_FROM_CLASS (klass),
+      G_SIGNAL_RUN_LAST,
+      G_STRUCT_OFFSET (GstDecodeBinClass, removed_decoded_pad), NULL, NULL,
+      gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
+  gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE] =
+      g_signal_new ("unknown-type", G_TYPE_FROM_CLASS (klass),
+      G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, unknown_type),
+      NULL, NULL, gst_marshal_VOID__OBJECT_OBJECT, G_TYPE_NONE, 2,
+      GST_TYPE_PAD, GST_TYPE_CAPS);
+  gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE] =
+    g_signal_new ("autoplug-continue", G_TYPE_FROM_CLASS (klass),
+		  G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_continue),
+		  _gst_boolean_accumulator, NULL, gst_play_marshal_BOOLEAN__OBJECT, G_TYPE_BOOLEAN, 1,
+		  GST_TYPE_CAPS);
+  gst_decode_bin_signals[SIGNAL_AUTOPLUG_SORT] =
+    g_signal_new ("autoplug-sort", G_TYPE_FROM_CLASS (klass),
+		  G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_sort),
+		  _gst_boolean_accumulator, NULL, gst_play_marshal_BOOLEAN__OBJECT_POINTER, G_TYPE_BOOLEAN, 2,
+		  GST_TYPE_CAPS, G_TYPE_POINTER);
+  
+  gobject_klass->dispose = GST_DEBUG_FUNCPTR (gst_decode_bin_dispose);
+  gobject_klass->finalize = GST_DEBUG_FUNCPTR (gst_decode_bin_finalize);
+
+  klass->autoplug_continue = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_continue);
+  klass->autoplug_sort = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_sort);
+
+  gst_element_class_add_pad_template (gstelement_klass,
+      gst_static_pad_template_get (&decoder_bin_sink_template));
+  gst_element_class_add_pad_template (gstelement_klass,
+      gst_static_pad_template_get (&decoder_bin_src_template));
+
+  gst_element_class_set_details (gstelement_klass, &gst_decode_bin_details);
+
+  gstelement_klass->change_state = GST_DEBUG_FUNCPTR (gst_decode_bin_change_state);
+}
+
+/* the filter function for selecting the elements we can use in
+ * autoplugging */
+static gboolean
+gst_decode_bin_factory_filter (GstPluginFeature * feature,
+    GstDecodeBin * decode_bin)
+{
+  guint rank;
+  const gchar *klass;
+
+  /* we only care about element factories */
+  if (!GST_IS_ELEMENT_FACTORY (feature))
+    return FALSE;
+
+  klass = gst_element_factory_get_klass (GST_ELEMENT_FACTORY (feature));
+  /* only demuxers, decoders and parsers can play */
+  if (strstr (klass, "Demux") == NULL &&
+      strstr (klass, "Decoder") == NULL && strstr (klass, "Parse") == NULL) {
+    return FALSE;
+  }
+
+  /* only select elements with autoplugging rank */
+  rank = gst_plugin_feature_get_rank (feature);
+  if (rank < GST_RANK_MARGINAL)
+    return FALSE;
+
+  return TRUE;
+}
+
+/* function used to sort element features */
+static gint
+compare_ranks (GstPluginFeature * f1, GstPluginFeature * f2)
+{
+  gint diff;
+  const gchar *rname1, *rname2;
+
+  diff = gst_plugin_feature_get_rank (f2) - gst_plugin_feature_get_rank (f1);
+  if (diff != 0)
+    return diff;
+
+  rname1 = gst_plugin_feature_get_name (f1);
+  rname2 = gst_plugin_feature_get_name (f2);
+
+  diff = strcmp (rname2, rname1);
+
+  return diff;
+}
+
+static void
+print_feature (GstPluginFeature * feature)
+{
+  const gchar *rname;
+
+  rname = gst_plugin_feature_get_name (feature);
+
+  GST_DEBUG ("%s", rname);
+}
+
+static void
+gst_decode_bin_init (GstDecodeBin * decode_bin)
+{
+  GList *factories;
+
+  /* first filter out the interesting element factories */
+  factories = gst_default_registry_feature_filter (
+      (GstPluginFeatureFilter) gst_decode_bin_factory_filter,
+      FALSE, decode_bin);
+
+  /* sort them according to their ranks */
+  decode_bin->factories = g_list_sort (factories, (GCompareFunc) compare_ranks);
+  /* do some debugging */
+  g_list_foreach (decode_bin->factories, (GFunc) print_feature, NULL);
+
+
+  /* we create the typefind element only once */
+  decode_bin->typefind = gst_element_factory_make ("typefind", "typefind");
+  if (!decode_bin->typefind) {
+    g_warning ("can't find typefind element, decodebin will not work");
+  } else {
+    GstPad *pad;
+    GstPad *gpad;
+
+    /* add the typefind element */
+    if (!gst_bin_add (GST_BIN (decode_bin), decode_bin->typefind)) {
+      g_warning ("Could not add typefind element, decodebin will not work");
+      gst_object_unref (decode_bin->typefind);
+      decode_bin->typefind = NULL;
+    }
+
+    /* get the sinkpad */
+    pad = gst_element_get_pad (decode_bin->typefind, "sink");
+
+    /* ghost the sink pad to ourself */
+    gpad = gst_ghost_pad_new ("sink", pad);
+    gst_pad_set_active (gpad, TRUE);
+    gst_element_add_pad (GST_ELEMENT (decode_bin), gpad);
+
+    gst_object_unref (pad);
+
+    /* connect a signal to find out when the typefind element found
+     * a type */
+    g_signal_connect (G_OBJECT (decode_bin->typefind), "have_type",
+        G_CALLBACK (type_found), decode_bin);
+  }
+
+  decode_bin->lock = g_mutex_new ();
+  decode_bin->activegroup = NULL;
+  decode_bin->groups = NULL;
+
+  add_fakesink (decode_bin);
+
+  /* FILLME */
+}
+
+static void
+gst_decode_bin_dispose (GObject * object)
+{
+  GstDecodeBin *decode_bin;
+
+  decode_bin = GST_DECODE_BIN (object);
+
+  if (decode_bin->factories)
+    gst_plugin_feature_list_free (decode_bin->factories);
+  decode_bin->factories = NULL;
+
+  /* FILLME */
+  remove_fakesink(decode_bin);
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gst_decode_bin_finalize (GObject * object)
+{
+
+  /* FILLME */
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+/*****
+ * Default autoplug signal handlers
+ *****/
+
+static gboolean
+gst_decode_bin_autoplug_continue (GstElement * element, GstCaps * caps)
+{
+  return TRUE;
+}
+
+static gboolean
+gst_decode_bin_autoplug_sort (GstElement * element, GstCaps * caps,
+			      GList ** list)
+{
+  return TRUE;
+}
+
+
+
+/********
+ * Discovery methods
+ *****/
+
+static gboolean are_raw_caps (GstDecodeBin * dbin, GstCaps * caps);
+static gboolean is_demuxer_element (GstElement * srcelement);
+static GList* find_compatibles (GstDecodeBin * decode_bin, const GstCaps * caps);
+
+static gboolean connect_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad, 
+			     GList * factories, GstDecodeGroup * group);
+static gboolean connect_element (GstDecodeBin * dbin, GstElement * element,
+				 GstDecodeGroup * group);
+static void expose_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad,
+			GstDecodeGroup * group);
+
+static void pad_added_group_cb (GstElement * element, GstPad * pad,
+			  GstDecodeGroup * group);
+static void pad_removed_group_cb (GstElement * element, GstPad * pad,
+			    GstDecodeGroup * group);
+static void no_more_pads_group_cb (GstElement * element, GstDecodeGroup * group);
+static void pad_added_cb (GstElement * element, GstPad * pad,
+			  GstDecodeBin * dbin);
+static void pad_removed_cb (GstElement * element, GstPad * pad,
+			    GstDecodeBin * dbin);
+static void no_more_pads_cb (GstElement * element, GstDecodeBin * dbin);
+
+static GstDecodeGroup * get_current_group (GstDecodeBin * dbin);
+
+static void
+analyze_new_pad (GstDecodeBin * dbin, GstElement *src, GstPad * pad, GstCaps * caps,
+		 GstDecodeGroup * group)
+{
+  gboolean apcontinue = TRUE;
+  GList * factories = NULL;
+  gboolean apsort = TRUE;
+  
+  GST_DEBUG_OBJECT (dbin, "Pad %s:%s caps:%"GST_PTR_FORMAT,
+		    GST_DEBUG_PAD_NAME (pad), caps);
+
+  if ((caps == NULL) || gst_caps_is_empty (caps))
+    goto unknown_type;
+
+  if (gst_caps_is_any (caps))
+    goto any_caps;
+
+  /* 1. Emit 'autoplug-continue' */
+  g_signal_emit (G_OBJECT (dbin),
+		 gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE],
+		 0, caps, &apcontinue);
+  
+  /* 1.a if autoplug-continue is FALSE or caps is a raw format, goto pad_is_final */
+  if ((!apcontinue) || are_raw_caps(dbin, caps))
+    goto expose_pad;
+  
+  /* 1.b else if there's no compatible factory or 'autoplug-sort' returned FALSE, goto pad_not_used */
+  if ((factories = find_compatibles (dbin, caps))) {
+    /* emit autoplug-sort */
+    g_signal_emit (G_OBJECT (dbin),
+		   gst_decode_bin_signals[SIGNAL_AUTOPLUG_SORT],
+		   0, caps, &factories, &apsort);
+    if (!apsort) {
+      g_list_free (factories);
+      /* User doesn't want that pad */
+      goto pad_not_wanted;
+    }
+  } else {
+    /* no compatible factories */
+    goto unknown_type;
+  }
+  
+  /* 1.c else goto pad_is_valid */
+  GST_LOG_OBJECT (pad, "Let's continue discovery on this pad");
+
+  connect_pad (dbin, src, pad, factories, group);
+  g_list_free (factories);
+
+  return;
+
+ expose_pad:
+  {
+    GST_LOG_OBJECT (dbin, "Pad is final. autoplug-continue:%d",
+		    apcontinue);
+    expose_pad (dbin, src, pad, group);
+    return;
+  }
+
+ pad_not_wanted:
+  {
+    GST_LOG_OBJECT (pad, "User doesn't want this pad, stopping discovery");
+    return;
+  }
+
+ unknown_type:
+  {
+    GST_LOG_OBJECT (pad, "Unknown type, firing signal");
+    g_signal_emit (G_OBJECT (dbin),
+		   gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE],
+		   0, pad, caps);
+    return;
+  }
+
+ any_caps:
+  {
+    GST_WARNING_OBJECT (pad, "pad has ANY caps, not able to autoplug to anything");
+    /* FIXME : connect to caps notification */
+    return;
+  }
+}
+
+
+/** connect_pad:
+ *
+ * Try to connect the given pad to an element created from one of the factories,
+ * and recursively.
+ *
+ * Returns TRUE if an element was properly created and linked
+ */
+
+static gboolean
+connect_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad, 
+	     GList * factories, GstDecodeGroup * group)
+{
+  gboolean res = FALSE;
+  GList * tmp;
+
+  g_return_val_if_fail (factories != NULL, FALSE);
+  GST_DEBUG_OBJECT (dbin, "pad %s:%s , group:%p",
+		    GST_DEBUG_PAD_NAME (pad), group);
+
+  /* 1. is element demuxer or parser */
+  if (is_demuxer_element (src)) {
+    GstPad *mqpad;
+    GST_LOG_OBJECT (src, "is a demuxer, connecting the pad through multiqueue");
+
+    if (!group)
+      if (!(group = get_current_group (dbin))) {
+	group = gst_decode_group_new (dbin);
+	DECODE_BIN_LOCK (dbin);
+	dbin->groups = g_list_append(dbin->groups, group);
+	DECODE_BIN_UNLOCK (dbin);
+      }
+
+    if (!(mqpad = gst_decode_group_control_demuxer_pad (group, pad)))
+      goto beach;
+    pad = mqpad;
+  }
+
+  /* 2. Try to create an element and link to it */
+  for (tmp = factories; tmp; tmp = g_list_next (tmp)) {
+    GstElementFactory * factory = (GstElementFactory*) tmp->data;
+    GstElement * element;
+    GstPad * sinkpad;
+
+    /* 2.1. Try to create an element */
+    if ((element = gst_element_factory_create (factory, NULL)) == NULL) {
+      GST_WARNING_OBJECT (dbin, "Could not create an element from %s",
+			  gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
+      continue;
+    }
+
+    /* 2.3. Find its sink pad */
+    if (!(sinkpad = find_sink_pad (element))) {
+      GST_WARNING_OBJECT (dbin, "Element %s doesn't have a sink pad",
+			 GST_ELEMENT_NAME (element));
+      gst_object_unref (element);
+      continue;
+    }
+
+    /* 2.4 add it ... */
+    if (!(gst_bin_add (GST_BIN (dbin), element))) {
+      GST_WARNING_OBJECT (dbin, "Couldn't add %s to the bin",
+			  GST_ELEMENT_NAME (element));
+      gst_object_unref (sinkpad);
+      gst_object_unref (element);
+      continue;
+    }
+
+    /* ... activate it ... */
+    if ((gst_element_set_state (element, GST_STATE_READY)) == GST_STATE_CHANGE_FAILURE) {
+      GST_WARNING_OBJECT (dbin, "Couldn't set %s to READY",
+			  GST_ELEMENT_NAME (element));
+      gst_object_unref (sinkpad);
+      gst_bin_remove (GST_BIN (dbin), element);
+      continue;
+    }
+    
+    /* 2.5 ...and try to link */
+    if ((gst_pad_link (pad, sinkpad)) != GST_PAD_LINK_OK) {
+      GST_WARNING_OBJECT (dbin, "Link failed on pad %s:%s",
+			  GST_DEBUG_PAD_NAME (sinkpad));
+      gst_element_set_state (element, GST_STATE_NULL);
+      gst_object_unref (sinkpad);
+      gst_bin_remove (GST_BIN (dbin), element);
+      continue;
+    }
+
+    GST_LOG_OBJECT (dbin, "linked on pad %s:%s",
+		    GST_DEBUG_PAD_NAME (pad));
+
+    /* link this element further */
+    connect_element (dbin, element, group);
+
+    /* Bring the element to the state of the parent */
+    if ((gst_element_set_state (element, GST_STATE_PAUSED)) == GST_STATE_CHANGE_FAILURE) {
+      GST_WARNING_OBJECT (dbin, "Couldn't set %s to PAUSED",
+			  GST_ELEMENT_NAME (element));
+      gst_element_set_state (element, GST_STATE_NULL);
+      gst_object_unref (sinkpad);
+      gst_bin_remove (GST_BIN (dbin), element);
+      continue;
+    }
+
+    res = TRUE;
+    break;
+  }
+
+ beach:
+  return res;
+}
+
+static gboolean
+connect_element (GstDecodeBin *dbin, GstElement * element, GstDecodeGroup * group)
+{
+  GList * pads;
+  gboolean res = TRUE;
+  gboolean dynamic = FALSE;
+  GList * to_connect = NULL;
+
+  GST_DEBUG_OBJECT (dbin, "Attempting to connect element %s [group:%p] further",
+		    GST_ELEMENT_NAME (element), group);
+
+  /* 1. Loop over pad templates, grabbing existing pads along the way */
+  for (pads = GST_ELEMENT_GET_CLASS (element)->padtemplates; pads;
+      pads = g_list_next (pads)) {
+    GstPadTemplate *templ = GST_PAD_TEMPLATE (pads->data);
+    const gchar *templ_name;
+
+    /* we are only interested in source pads */
+    if (GST_PAD_TEMPLATE_DIRECTION (templ) != GST_PAD_SRC)
+      continue;
+
+    templ_name = GST_PAD_TEMPLATE_NAME_TEMPLATE (templ);
+    GST_DEBUG_OBJECT (dbin, "got a source pad template %s", templ_name);
+
+    /* figure out what kind of pad this is */
+    switch (GST_PAD_TEMPLATE_PRESENCE (templ)) {
+      case GST_PAD_ALWAYS:
+      {
+        /* get the pad that we need to autoplug */
+        GstPad *pad = gst_element_get_pad (element, templ_name);
+
+        if (pad) {
+          GST_DEBUG_OBJECT (dbin, "got the pad for always template %s",
+              templ_name);
+          /* here is the pad, we need to autoplug it */
+          to_connect = g_list_prepend (to_connect, pad);
+        } else {
+          /* strange, pad is marked as always but it's not
+           * there. Fix the element */
+          GST_WARNING_OBJECT (dbin,
+              "could not get the pad for always template %s", templ_name);
+        }
+        break;
+      }
+      case GST_PAD_SOMETIMES:
+      {
+        /* try to get the pad to see if it is already created or
+         * not */
+        GstPad *pad = gst_element_get_pad (element, templ_name);
+
+        if (pad) {
+          GST_DEBUG_OBJECT (dbin, "got the pad for sometimes template %s",
+              templ_name);
+          /* the pad is created, we need to autoplug it */
+          to_connect = g_list_prepend (to_connect, pad);
+        } else {
+          GST_DEBUG_OBJECT (dbin,
+              "did not get the sometimes pad of template %s", templ_name);
+          /* we have an element that will create dynamic pads */
+          dynamic = TRUE;
+        }
+        break;
+      }
+      case GST_PAD_REQUEST:
+        /* ignore request pads */
+        GST_DEBUG_OBJECT (dbin, "ignoring request padtemplate %s",
+            templ_name);
+        break;
+    }
+  }
+
+  /* 2. if there are more potential pads, connect to relevent signals */
+  if (dynamic) {
+    if (group) {
+      g_signal_connect (G_OBJECT (element), "pad-added",
+			G_CALLBACK (pad_added_group_cb), group);
+      g_signal_connect (G_OBJECT (element), "pad-removed",
+			G_CALLBACK (pad_removed_group_cb), group);
+      g_signal_connect (G_OBJECT (element), "no-more-pads",
+			G_CALLBACK (no_more_pads_group_cb), group);
+    } else {
+      /* This is a non-grouped element, the handlers are different */
+      g_signal_connect (G_OBJECT (element), "pad-added",
+			G_CALLBACK (pad_added_cb), dbin);
+      g_signal_connect (G_OBJECT (element), "pad-removed",
+			G_CALLBACK (pad_removed_cb), dbin);
+      g_signal_connect (G_OBJECT (element), "no-more-pads",
+			G_CALLBACK (no_more_pads_cb), dbin);
+    }
+  }
+
+  /* 3. for every available pad, connect it */
+  for (pads = to_connect; pads; pads = g_list_next (pads)) {
+    GstPad * pad = GST_PAD_CAST (pads->data);
+    GstCaps * caps;
+    
+    caps = gst_pad_get_caps (pad);
+    analyze_new_pad (dbin, element, pad, caps, group);
+    if (caps)
+      gst_caps_unref (caps);
+    
+    gst_object_unref (pad);
+  }
+  g_list_free (to_connect);
+  
+  return res;
+}
+
+/* expose_pad:
+ *
+ * Expose the given pad on the group as a decoded pad.
+ * If group is NULL, a GstDecodeGroup will be created and setup properly.
+ */
+static void
+expose_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad,
+	    GstDecodeGroup * group)
+{
+  GST_DEBUG_OBJECT (dbin, "pad %s:%s, group:%p",
+		    GST_DEBUG_PAD_NAME (pad), group);
+  
+  if (!group)
+    if (!(group = get_current_group (dbin))) {
+      group = gst_decode_group_new (dbin);
+      DECODE_BIN_LOCK (dbin);
+      dbin->groups = g_list_append(dbin->groups, group);
+      DECODE_BIN_UNLOCK (dbin);
+    }
+  
+  if (is_demuxer_element (src)) {
+    GstPad *mqpad;
+    GST_LOG_OBJECT (src, "is a demuxer, connecting the pad through multiqueue");
+
+    if (!(mqpad = gst_decode_group_control_demuxer_pad (group, pad)))
+      goto beach;
+    pad = mqpad;
+  }
+
+  gst_decode_group_control_source_pad (group, pad);
+
+ beach:
+  return;
+}
+
+static void type_found (GstElement * typefind, guint probability,
+    GstCaps * caps, GstDecodeBin * decode_bin)
+{
+  GstPad * pad;
+
+  GST_STATE_LOCK (decode_bin);
+
+  GST_DEBUG_OBJECT (decode_bin, "typefind found caps %" GST_PTR_FORMAT,
+		    caps);
+
+  pad = gst_element_get_pad (typefind, "src");
+  
+  analyze_new_pad (decode_bin, typefind, pad, caps, NULL);
+
+  gst_object_unref (pad);
+
+  GST_STATE_UNLOCK (decode_bin);
+  return;  
+}
+
+static void
+pad_added_group_cb (GstElement * element, GstPad * pad, GstDecodeGroup * group)
+{
+  GST_LOG_OBJECT (pad, "pad added, group:%p", group);
+
+  /* FIXME : FILLME */
+}
+
+static void
+pad_removed_group_cb (GstElement * element, GstPad * pad, GstDecodeGroup * group)
+{
+  GST_LOG_OBJECT (pad, "pad removed, group:%p", group);
+
+  /* In fact, we don't have to do anything here, the active group will be
+   * removed when the group's multiqueue is drained */
+}
+
+static void
+no_more_pads_group_cb (GstElement * element, GstDecodeGroup * group)
+{
+  GST_LOG_OBJECT (element, "no more pads, setting group %p to complete",
+		  group);
+
+  /* FIXME : FILLME */
+}
+
+static void
+pad_added_cb (GstElement * element, GstPad * pad, GstDecodeBin * dbin)
+{
+  GstCaps * caps;
+
+  GST_LOG_OBJECT (pad, "Pad added to non-grouped element");
+  
+  caps = gst_pad_get_caps (pad);
+  analyze_new_pad (dbin, element, pad, caps, NULL);
+  if (caps)
+    gst_caps_unref (caps);
+}
+
+static void
+pad_removed_cb (GstElement * element, GstPad * pad, GstDecodeBin * dbin)
+{
+  GST_LOG_OBJECT (pad, "Pad removed from non-grouped element");
+}
+
+static void
+no_more_pads_cb (GstElement * element, GstDecodeBin * dbin)
+{
+  GstDecodeGroup * group;
+
+  GST_LOG_OBJECT (element, "No more pads, setting current group to complete");
+
+  /* Find the non-complete group, there should only be one */
+  if (!(group = get_current_group(dbin)))
+    goto no_group;
+
+  gst_decode_group_set_complete (group);
+  return;
+
+ no_group:
+  {
+    GST_WARNING_OBJECT (dbin, "We couldn't find a non-completed group !!");
+    return;
+  }
+}
+
+/* this function runs through the element factories and returns a list
+ * of all elements that are able to sink the given caps 
+ */
+static GList *
+find_compatibles (GstDecodeBin * decode_bin, const GstCaps * caps)
+{
+  GList *factories;
+  GList *to_try = NULL;
+
+  /* loop over all the factories */
+  for (factories = decode_bin->factories; factories;
+      factories = g_list_next (factories)) {
+    GstElementFactory *factory = GST_ELEMENT_FACTORY (factories->data);
+    const GList *templates;
+    GList *walk;
+
+    /* get the templates from the element factory */
+    templates = gst_element_factory_get_static_pad_templates (factory);
+    for (walk = (GList *) templates; walk; walk = g_list_next (walk)) {
+      GstStaticPadTemplate *templ = walk->data;
+
+      /* we only care about the sink templates */
+      if (templ->direction == GST_PAD_SINK) {
+        GstCaps *intersect;
+        GstCaps *tmpl_caps;
+
+        /* try to intersect the caps with the caps of the template */
+        tmpl_caps = gst_static_caps_get (&templ->static_caps);
+
+        intersect = gst_caps_intersect (caps, tmpl_caps);
+        gst_caps_unref (tmpl_caps);
+
+        /* check if the intersection is empty */
+        if (!gst_caps_is_empty (intersect)) {
+          /* non empty intersection, we can use this element */
+          to_try = g_list_prepend (to_try, factory);
+          gst_caps_unref (intersect);
+          break;
+        }
+        gst_caps_unref (intersect);
+      }
+    }
+  }
+  to_try = g_list_reverse (to_try);
+
+  return to_try;
+}
+
+/* Decide whether an element is a demuxer based on the 
+ * klass and number/type of src pad templates it has */
+static gboolean
+is_demuxer_element (GstElement * srcelement)
+{
+  GstElementFactory *srcfactory;
+  GstElementClass *elemclass;
+  GList *templates, *walk;
+  const gchar *klass;
+  gint potential_src_pads = 0;
+
+  srcfactory = gst_element_get_factory (srcelement);
+  klass = gst_element_factory_get_klass (srcfactory);
+
+  /* Can't be a demuxer unless it has Demux in the klass name */
+  if (!strstr (klass, "Demux"))
+    return FALSE;
+
+  /* Walk the src pad templates and count how many the element
+   * might produce */
+  elemclass = GST_ELEMENT_GET_CLASS (srcelement);
+
+  walk = templates = gst_element_class_get_pad_template_list (elemclass);
+  while (walk != NULL) {
+    GstPadTemplate *templ;
+
+    templ = (GstPadTemplate *) walk->data;
+    if (GST_PAD_TEMPLATE_DIRECTION (templ) == GST_PAD_SRC) {
+      switch (GST_PAD_TEMPLATE_PRESENCE (templ)) {
+        case GST_PAD_ALWAYS:
+        case GST_PAD_SOMETIMES:
+          if (strstr (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ), "%"))
+            potential_src_pads += 2;    /* Might make multiple pads */
+          else
+            potential_src_pads += 1;
+          break;
+        case GST_PAD_REQUEST:
+          potential_src_pads += 2;
+          break;
+      }
+    }
+    walk = g_list_next (walk);
+  }
+
+  if (potential_src_pads < 2)
+    return FALSE;
+
+  return TRUE;
+}
+
+/* Returns TRUE if the caps are raw, or if they are compatible with the caps 
+ * specified in the 'raw-caps' property */
+static gboolean
+are_raw_caps (GstDecodeBin * dbin, GstCaps * caps) 
+{
+  GstStructure * structure;
+  const gchar * mimetype;
+
+  /* FIXME, iterate over more structures? I guess it is possible that
+   * this pad has some encoded and some raw pads. This code will fail
+   * then if the first structure is not the raw type... */
+
+  structure = gst_caps_get_structure (caps, 0);
+  mimetype = gst_structure_get_name (structure);
+
+  if (g_str_has_prefix (mimetype, "video/x-raw") ||
+      g_str_has_prefix (mimetype, "audio/x-raw") ||
+      g_str_has_prefix (mimetype, "text/plain") ||
+      g_str_has_prefix (mimetype, "text/x-pango-markup"))
+    return TRUE;
+
+  /* FILLME : Should check the 'raw-caps' property */
+
+  return FALSE;
+}
+
+
+/****
+ * GstDecodeGroup functions
+ ****/
+
+static void
+multi_queue_overrun_cb (GstElement * queue, GstDecodeGroup * group)
+{
+  GST_LOG_OBJECT (group->dbin, "multiqueue is full");
+
+  /* if we haven't exposed the group, do it */
+  gst_decode_group_expose (group);
+}
+
+static void
+multi_queue_underrun_cb (GstElement * queue, GstDecodeGroup * group)
+{
+  GstDecodeBin * dbin = group->dbin;
+
+  GST_LOG_OBJECT (dbin, "multiqueue is empty for group %p", group);
+
+  /* Check if we need to activate another group */
+  DECODE_BIN_LOCK (dbin);
+  if ((group == dbin->activegroup) && dbin->groups) {
+    GST_DEBUG_OBJECT (dbin, "Switching to new group");
+    /* unexpose current active */
+    gst_decode_group_hide (group);
+    gst_decode_group_free (group);
+
+    /* expose first group of groups */
+    gst_decode_group_expose ((GstDecodeGroup*) dbin->groups->data);
+  }
+  DECODE_BIN_UNLOCK (dbin);
+}
+
+/* gst_decode_group_new
+ *
+ * Creates a new GstDecodeGroup. It is up to the caller to add it to the list
+ * of groups.
+ */
+static GstDecodeGroup *
+gst_decode_group_new (GstDecodeBin * dbin)
+{
+  GstDecodeGroup * group;
+  GstElement * mq;
+
+  GST_LOG_OBJECT (dbin, "Creating new group");
+
+  if (!(mq = gst_element_factory_make ("multiqueue", NULL))) {
+    GST_WARNING ("Couldn't create multiqueue element");
+    return NULL;
+  }
+
+  g_object_set (G_OBJECT (mq),
+		"max-size-bytes", 5 * 1024 * 1024,
+		"max-size-time", G_GINT64_CONSTANT (0),
+		"max-size-buffers", 0,
+		NULL);
+
+  group = g_new0 (GstDecodeGroup, 1);
+  group->lock = g_mutex_new ();
+  group->dbin = dbin;
+  group->multiqueue = mq;
+  group->exposed = FALSE;
+  group->drained = FALSE;
+  group->blocked = FALSE;
+  group->complete = FALSE;
+  group->endpads = NULL;
+
+  g_signal_connect (G_OBJECT (mq), "overrun",
+		    G_CALLBACK (multi_queue_overrun_cb), group);
+  g_signal_connect (G_OBJECT (mq), "underrun",
+		    G_CALLBACK (multi_queue_underrun_cb), group);
+
+  gst_bin_add (GST_BIN (dbin), group->multiqueue);
+  gst_element_set_state (group->multiqueue, GST_STATE_PAUSED);
+
+  GST_LOG_OBJECT (dbin, "Returning new group %p", group);
+
+  return group;
+}
+
+/** get_current_group:
+ *
+ * Returns the current non-completed group.
+ *
+ * Returns NULL if no groups are available, or all groups are completed.
+ */
+static GstDecodeGroup *
+get_current_group (GstDecodeBin * dbin)
+{
+  GList * tmp;
+  GstDecodeGroup * group = NULL;
+
+  DECODE_BIN_LOCK (dbin);
+  for (tmp = dbin->groups; tmp; tmp = g_list_next (tmp)) {
+    GstDecodeGroup * this = (GstDecodeGroup *) tmp->data;
+
+    if (!this->complete) {
+      group = this;
+      break;
+    }
+  }
+  DECODE_BIN_UNLOCK (dbin);
+
+  GST_LOG_OBJECT (dbin, "Returning group %p", group);
+
+  return group;
+}
+
+
+/* gst_decode_group_control_demuxer_pad
+ *
+ * Adds a new demuxer srcpad to the given group.
+ *
+ * Returns the srcpad of the multiqueue corresponding the given pad.
+ * Returns NULL if there was an error.
+ */
+static GstPad *
+gst_decode_group_control_demuxer_pad (GstDecodeGroup * group, GstPad * pad)
+{
+  GstPad * srcpad, * sinkpad;
+  gchar * nb, *sinkname, *srcname;
+
+  GST_LOG ("group:%p pad %s:%s", group, GST_DEBUG_PAD_NAME (pad));
+
+  srcpad = NULL;
+
+  if (!(sinkpad = gst_element_get_pad (group->multiqueue, "sink%d"))) {
+    GST_ERROR ("Couldn't get sinkpad from multiqueue");
+    return NULL;
+  }
+
+  if ((gst_pad_link (pad, sinkpad) != GST_PAD_LINK_OK)) {
+    GST_ERROR ("Couldn't link demuxer and multiqueue");
+    goto beach;
+  }
+  
+  sinkname = gst_pad_get_name (sinkpad);
+  nb = sinkname + 4;
+  srcname = g_strdup_printf ("src%s", nb);
+  g_free (sinkname);
+
+  GROUP_MUTEX_LOCK (group);
+
+  if (!(srcpad = gst_element_get_pad (group->multiqueue, srcname))) {
+    GST_ERROR ("Couldn't get srcpad %s from multiqueue", srcname);
+    g_free (srcname);
+    goto beach;
+  }
+  g_free (srcname);
+
+ beach:
+  GROUP_MUTEX_UNLOCK (group);
+  gst_object_unref (sinkpad);
+  return srcpad;
+}
+
+static gboolean
+gst_decode_group_control_source_pad (GstDecodeGroup * group, GstPad * pad)
+{
+  GstDecodePad * dpad;
+
+  g_return_val_if_fail (group != NULL, FALSE);
+
+  GST_LOG ("group:%p , pad %s:%s", group, GST_DEBUG_PAD_NAME (pad));
+
+  /* FIXME : check if pad is already controlled */
+  
+  GROUP_MUTEX_LOCK (group);
+
+  /* Create GstDecodePad for the pad */
+  dpad = gst_decode_pad_new (group, pad, TRUE);
+
+  group->endpads = g_list_append (group->endpads, dpad);
+
+  GROUP_MUTEX_UNLOCK (group);
+
+  return TRUE;
+}
+
+/* gst_decode_group_check_if_blocked:
+ *
+ * Call this when one of the pads blocked status has changed.
+ * If the group is complete and blocked, the group will be marked as blocked
+ * and will ghost/expose all pads on decodebin if the group is the current one.
+ */
+static void
+gst_decode_group_check_if_blocked (GstDecodeGroup * group)
+{
+  GList * tmp;
+  gboolean blocked = TRUE;
+
+  GST_LOG ("group : %p");
+
+  /* 1. don't do anything if group is not complete */
+  if (!group->complete)
+    return;
+
+  for (tmp = group->endpads; tmp; tmp = g_list_next (tmp)) {
+    GstDecodePad * dpad = (GstDecodePad *) tmp->data;
+
+    if (!dpad->blocked) {
+      blocked = FALSE;
+      break;
+    }
+  }
+
+  /* 2. Update status of group*/
+  group->blocked = blocked;
+  GST_LOG ("group is blocked:%d", blocked);
+
+  /* 3. don't do anything if not blocked completely */
+  if (!blocked)
+    return;
+
+  /* 4. if we're the current group, expose pads */
+  if (!gst_decode_group_expose (group))
+    GST_WARNING_OBJECT (group->dbin, "Couldn't expose group");
+}
+
+static void
+gst_decode_group_check_if_drained (GstDecodeGroup * group)
+{
+  GList * tmp;
+  GstDecodeBin * dbin = group->dbin;
+  gboolean drained = TRUE;
+  
+  GST_LOG ("group : %p", group);
+
+  for (tmp = group->endpads; tmp; tmp = g_list_next (tmp)) {
+    GstDecodePad * dpad = (GstDecodePad *) tmp->data;
+
+    GST_LOG ("testing dpad %p", dpad);
+
+    if (!dpad->drained) {
+      drained = FALSE;
+      break;
+    }
+  }
+
+  group->drained = drained;
+  GST_LOG ("group is drained");
+
+  if (!drained)
+    return;
+
+  DECODE_BIN_LOCK (dbin);
+  if ((group == dbin->activegroup) && dbin->groups) {
+    GST_DEBUG_OBJECT (dbin, "Switching to new group");
+    
+    gst_decode_group_hide (group);
+    gst_decode_group_free (group);
+
+    gst_decode_group_expose ((GstDecodeGroup*) dbin->groups->data);
+  }
+  DECODE_BIN_UNLOCK (dbin);
+}
+
+/* gst_decode_group_expose:
+ *
+ * Expose this group's pads.
+ *
+ * Not MT safe, please take the group lock
+ */
+
+static gboolean
+gst_decode_group_expose (GstDecodeGroup * group)
+{
+  GList * tmp;
+  GList * next = NULL;
+
+/*   DECODE_BIN_LOCK (group->dbin); */
+  if (group->dbin->activegroup) {
+    GST_DEBUG_OBJECT (group->dbin, "A group is already active and exposed");
+    DECODE_BIN_UNLOCK (group->dbin);
+    return TRUE;
+  }
+
+  if (group->dbin->activegroup == group) {
+    GST_WARNING ("Group %p is already exposed", group);
+    DECODE_BIN_UNLOCK (group->dbin);
+    return TRUE;
+  }
+
+  if (!group->dbin->groups || (group != (GstDecodeGroup*) group->dbin->groups->data)) {
+    GST_WARNING ("Group %p is not the first group to expose", group);
+    DECODE_BIN_UNLOCK (group->dbin);
+    return FALSE;
+  }
+
+  GST_LOG ("Exposing group %p", group);
+  
+  /* Expose pads */
+
+  for (tmp = group->endpads; tmp; tmp = next) {
+    GstDecodePad * dpad = (GstDecodePad *) tmp->data;
+    gchar *padname;
+    GstPad * ghost;
+    
+    next = g_list_next (tmp);
+
+    /* 1. ghost pad */
+    padname = g_strdup_printf ("src%d", group->dbin->nbpads);
+    group->dbin->nbpads++;
+
+    ghost = gst_ghost_pad_new (padname, dpad->pad);
+    gst_pad_set_active (ghost, TRUE);
+    gst_element_add_pad (GST_ELEMENT (group->dbin), ghost);
+    group->ghosts = g_list_append (group->ghosts, ghost);
+
+    g_free (padname);
+
+    /* 2. emit signal */
+    GST_DEBUG_OBJECT (group->dbin, "emitting new-decoded-pad");
+    g_signal_emit (G_OBJECT (group->dbin),
+		   gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD], 0, ghost, (next == NULL));
+    GST_DEBUG_OBJECT (group->dbin, "emitted new-decoded-pad");
+
+    /* 3. Unblock internal  pad */
+    GST_DEBUG_OBJECT (dpad->pad, "unblocking");
+    gst_pad_set_blocked_async (dpad->pad, FALSE, (GstPadBlockCallback) source_pad_blocked_cb, dpad);
+    GST_DEBUG_OBJECT (dpad->pad, "unblocked");
+
+  }
+
+  group->dbin->activegroup = group;
+
+  /* pop off the first group */
+  group->dbin->groups = g_list_delete_link (group->dbin->groups, group->dbin->groups);
+
+/*   DECODE_BIN_UNLOCK (group->dbin); */
+
+  remove_fakesink (group->dbin);
+
+  group->exposed = TRUE;
+  GST_LOG_OBJECT (group->dbin, "Group %p exposed", group);
+  return TRUE;
+}
+
+static void
+gst_decode_group_hide (GstDecodeGroup * group)
+{
+  GList * tmp;
+
+  GST_LOG ("Hiding group %p", group);
+
+  if (group != group->dbin->activegroup) {
+    GST_WARNING ("This group is not the active one, aborting");
+    return;
+  }
+
+  GROUP_MUTEX_LOCK (group);
+
+  /* Remove ghost pads */
+  for (tmp = group->ghosts; tmp; tmp = g_list_next (tmp))
+    gst_element_remove_pad (GST_ELEMENT (group->dbin), (GstPad*) tmp->data);
+  
+  g_list_free (group->ghosts);
+  group->ghosts = NULL;
+
+  group->exposed = FALSE;
+
+  GROUP_MUTEX_UNLOCK (group);
+
+  group->dbin->activegroup = NULL;
+}
+
+static void
+gst_decode_group_free (GstDecodeGroup * group)
+{
+  GList * tmp;
+
+  GST_LOG ("group %p", group);
+
+  GROUP_MUTEX_LOCK (group);
+  /* Clear all GstDecodePad */
+  for (tmp = group->endpads; tmp; tmp = g_list_next (tmp)) {
+    GstDecodePad * dpad = (GstDecodePad*) tmp->data;
+
+    g_free (dpad);
+  }
+  g_list_free (group->endpads);
+  group->endpads = NULL;
+
+  GROUP_MUTEX_UNLOCK (group);
+
+  g_free (group->lock);
+  g_free (group);
+}
+
+/* gst_decode_group_set_complete:
+ *
+ * Mark the group as complete. This means no more streams will be controlled
+ * through this group.
+ *
+ * MT safe
+ */
+static void
+gst_decode_group_set_complete (GstDecodeGroup * group)
+{
+  GST_LOG_OBJECT (group->dbin, "Setting group %p to COMPLETE",
+		  group);
+
+  GROUP_MUTEX_LOCK (group);
+  group->complete = TRUE;
+  gst_decode_group_check_if_blocked (group);
+  GROUP_MUTEX_UNLOCK (group);
+}
+
+
+
+/*************************
+ * GstDecodePad functions
+ *************************/
+
+static void
+source_pad_blocked_cb (GstPad * pad, gboolean blocked, GstDecodePad * dpad)
+{
+  GST_LOG_OBJECT (pad, "blocked:%d , dpad:%p, dpad->group:%p",
+		  blocked, dpad, dpad->group);
+
+  /* Update this GstDecodePad status */
+  dpad->blocked = blocked;
+
+  if (blocked) {
+    GROUP_MUTEX_LOCK (dpad->group);
+    gst_decode_group_check_if_blocked (dpad->group);
+    GROUP_MUTEX_UNLOCK (dpad->group);
+  }
+}
+
+static gboolean
+source_pad_event_probe (GstPad * pad, GstEvent * event, GstDecodePad * dpad)
+{
+  GST_LOG_OBJECT (pad, "%s dpad:%p", GST_EVENT_TYPE_NAME (event), dpad);
+
+  if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) {
+    /* Set our pad as drained */
+    dpad->drained = TRUE;
+
+    /* Check if all pads are drained */
+    gst_decode_group_check_if_drained (dpad->group);
+  }
+
+  return TRUE;
+}
+
+/** gst_decode_pad_new:
+ *
+ * Creates a new GstDecodePad for the given pad.
+ * If block is TRUE, Sets the pad blocking asynchronously
+ */
+
+static GstDecodePad *
+gst_decode_pad_new (GstDecodeGroup * group, GstPad * pad, gboolean block)
+{
+  GstDecodePad * dpad;
+
+  dpad = g_new0 (GstDecodePad, 1);
+  dpad->pad = pad;
+  dpad->group = group;
+  dpad->blocked = FALSE;
+  dpad->drained = TRUE;
+
+  if (block)
+    gst_pad_set_blocked_async (pad, TRUE, (GstPadBlockCallback) source_pad_blocked_cb, dpad);
+  gst_pad_add_event_probe (pad, G_CALLBACK (source_pad_event_probe), dpad);
+  return dpad;
+}
+
+
+/*****
+ * Element add/remove
+ *****/
+
+/*
+ * add_fakesink / remove_fakesink
+ *
+ * We use a sink so that the parent ::change_state returns GST_STATE_CHANGE_ASYNC
+ * when that sink is present (since it's not connected to anything it will 
+ * always return GST_STATE_CHANGE_ASYNC).
+ *
+ * But this is an ugly way of achieving this goal.
+ * Ideally, we shouldn't use a sink and just return GST_STATE_CHANGE_ASYNC in
+ * our ::change_state if we have not exposed the active group.
+ * We also need to override ::get_state to fake the asynchronous behaviour.
+ * Once the active group is exposed, we would then post a
+ * GST_MESSAGE_STATE_DIRTY and return GST_STATE_CHANGE_SUCCESS (which will call
+ * ::get_state .
+ */
+
+static void add_fakesink (GstDecodeBin * decode_bin)
+{
+  GST_DEBUG_OBJECT (decode_bin, "Adding the fakesink");
+  
+  if (decode_bin->fakesink)
+    return;
+  
+  decode_bin->fakesink = gst_element_factory_make("fakesink", "async-fakesink");
+  if (!decode_bin->fakesink)
+    goto no_fakesink;
+  
+  /* hacky, remove sink flag, we don't want our decodebin to become a sink
+   * just because we add a fakesink element to make us ASYNC */
+  GST_OBJECT_FLAG_UNSET (decode_bin->fakesink, GST_ELEMENT_IS_SINK);
+
+  if (!gst_bin_add (GST_BIN (decode_bin), decode_bin->fakesink))
+    goto could_not_add;
+
+  return;
+  
+  /* ERRORS */
+ no_fakesink:
+  {
+    g_warning ("can't find fakesink element, decodebin will not work");
+    return;
+  }
+ could_not_add:
+  {
+    g_warning ("Could not add fakesink to decodebin, decodebin will not work");
+    gst_object_unref (decode_bin->fakesink);
+    decode_bin->fakesink = NULL;
+    return;
+  }
+}
+
+static void remove_fakesink (GstDecodeBin * decode_bin)
+{
+  if (decode_bin->fakesink == NULL)
+    return;
+
+  GST_DEBUG_OBJECT (decode_bin, "Removing the fakesink");
+
+  gst_element_set_state (decode_bin->fakesink, GST_STATE_NULL);
+  gst_bin_remove (GST_BIN (decode_bin), decode_bin->fakesink);
+  decode_bin->fakesink = NULL;
+
+  gst_element_post_message (GST_ELEMENT_CAST (decode_bin),
+        gst_message_new_state_dirty (GST_OBJECT_CAST (decode_bin)));
+}
+
+/*****
+ * convenience functions
+ *****/
+
+/** find_sink_pad
+ *
+ * Returns the first sink pad of the given element, or NULL if it doesn't have
+ * any.
+ */
+
+static GstPad *
+find_sink_pad (GstElement * element)
+{
+  GstIterator *it;
+  GstPad *pad = NULL;
+  gpointer point;
+
+  it = gst_element_iterate_sink_pads (element);
+  
+  if ((gst_iterator_next (it, &point)) == GST_ITERATOR_OK)
+    pad = (GstPad *) point;
+
+  gst_iterator_free (it);
+
+  return pad;
+}
+
+static GstStateChangeReturn
+gst_decode_bin_change_state (GstElement * element, GstStateChange transition)
+{
+  GstStateChangeReturn ret;
+  GstDecodeBin * dbin = GST_DECODE_BIN (element);
+
+  switch (transition) {
+  case GST_STATE_CHANGE_READY_TO_PAUSED: {
+    add_fakesink (dbin);
+    break;
+  }
+  default:
+    break;
+  }
+
+  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+
+  /* FIXME : put some cleanup functions here */
+
+  return ret;
+}
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  GST_DEBUG_CATEGORY_INIT (gst_decode_bin_debug, "decodebin2", 0, "decoder bin");
+
+  return gst_element_register (plugin, "decodebin2", GST_RANK_NONE,
+      GST_TYPE_DECODE_BIN);
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    "decodebin2",
+    "decoder bin newer version", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME,
+    GST_PACKAGE_ORIGIN)
