gnl: Rely on the GstElement to properly handle their seqnums

Actually it is not exactly thread safe to tweak them ourself at the GNL
level.

Co-Authored by: Mathieu Duponchelle <mathieu.duponchelle@opencreed.com>

gnl/gnlcomposition.c

@@ -973,9 +973,6 @@ ghost_event_probe_handler (GstPad * ghostpad G_GNUC_UNUSED,
       event2 = gst_event_new_segment (&copy);
       GST_EVENT_SEQNUM (event2) = GST_EVENT_SEQNUM (event);
 
-      if (GNL_OBJECT (comp)->seqnum == 0)
-        GNL_OBJECT (comp)->seqnum = GST_EVENT_SEQNUM (event);
-
       GST_PAD_PROBE_INFO_DATA (info) = event2;
       gst_event_unref (event);
     }
@@ -2450,10 +2447,6 @@ static void
 _relink_new_stack (GnlComposition * comp, GNode * stack,
     GstEvent * toplevel_seek)
 {
-  GST_INFO_OBJECT (comp, "Reseting seqnum to %i",
-      gst_event_get_seqnum (toplevel_seek));
-  GNL_OBJECT (comp)->wanted_seqnum = gst_event_get_seqnum (toplevel_seek);
-
   _relink_single_node (comp, stack, toplevel_seek);
 
   gst_event_unref (toplevel_seek);

gnl/gnlghostpad.c

@@ -299,12 +299,6 @@ translate_incoming_segment (GnlObject * object, GstEvent * event)
   GST_EVENT_SEQNUM (event2) = seqnum;
   gst_event_unref (event);
 
-  if (object->seqnum) {
-    GST_INFO_OBJECT (object, "Tweaking SEGMENT seqnum from %i to %i",
-        gst_event_get_seqnum (event2), object->seqnum);
-    gst_event_set_seqnum (event2, object->seqnum);
-  }
-
   return event2;
 }
 
@@ -328,25 +322,10 @@ internalpad_event_function (GstPad * internal, GstObject * parent,
   switch (priv->dir) {
     case GST_PAD_SRC:{
       switch (GST_EVENT_TYPE (event)) {
-        case GST_EVENT_SEEK:
-          object->wanted_seqnum = gst_event_get_seqnum (event);
-          object->seqnum = 0;
-          GST_DEBUG_OBJECT (object, "Setting wanted_seqnum to %i",
-              object->wanted_seqnum);
-          break;
         case GST_EVENT_SEGMENT:
           event = translate_outgoing_segment (object, event);
-          if (object->wanted_seqnum == gst_event_get_seqnum (event)) {
-            object->seqnum = object->wanted_seqnum;
-            object->wanted_seqnum = 0;
-          }
           break;
         case GST_EVENT_EOS:
-          if (object->seqnum) {
-            GST_INFO_OBJECT (object, "Tweaking EOS seqnum from %i to %i",
-                gst_event_get_seqnum (event), object->seqnum);
-            gst_event_set_seqnum (event, object->seqnum);
-          }
           break;
         default:
           break;
@@ -516,8 +495,6 @@ ghostpad_event_function (GstPad * ghostpad, GstObject * parent,
           GstPad *target;
 
           event = gnl_object_translate_incoming_seek (object, event);
-          object->wanted_seqnum = gst_event_get_seqnum (event);
-          object->seqnum = 0;
           if (!(target = gst_ghost_pad_get_target (GST_GHOST_PAD (ghostpad)))) {
             g_assert ("Seeked a pad with not target SHOULD NOT HAPPEND");
             ret = FALSE;

gnl/gnlobject.c

@@ -98,20 +98,6 @@ static gboolean gnl_object_commit_func (GnlObject * object, gboolean recurse);
 
 static GstStateChangeReturn gnl_object_prepare (GnlObject * object);
 
-
-static gboolean
-gnl_object_send_event (GstElement * element, GstEvent * event)
-{
-  if (GST_EVENT_TYPE (event) == GST_EVENT_SEEK) {
-    GNL_OBJECT (element)->wanted_seqnum = gst_event_get_seqnum (event);
-    GST_DEBUG_OBJECT (element, "Remember seqnum! %i",
-        GNL_OBJECT (element)->wanted_seqnum);
-  }
-
-
-  return GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
-}
-
 static void
 gnl_object_class_init (GnlObjectClass * klass)
 {
@@ -131,7 +117,6 @@ gnl_object_class_init (GnlObjectClass * klass)
   gobject_class->dispose = GST_DEBUG_FUNCPTR (gnl_object_dispose);
 
   gstelement_class->change_state = GST_DEBUG_FUNCPTR (gnl_object_change_state);
-  gstelement_class->send_event = GST_DEBUG_FUNCPTR (gnl_object_send_event);
 
   gnlobject_class->prepare = GST_DEBUG_FUNCPTR (gnl_object_prepare_func);
   gnlobject_class->cleanup = GST_DEBUG_FUNCPTR (gnl_object_cleanup_func);
@@ -425,8 +410,6 @@ gnl_object_cleanup (GnlObject * object)
 
   GST_DEBUG_OBJECT (object, "cleaning-up");
 
-  object->seqnum = 0;
-  object->wanted_seqnum = 0;
   if (!(GNL_OBJECT_GET_CLASS (object)->cleanup (object)))
     ret = GST_STATE_CHANGE_FAILURE;
 
@@ -663,8 +646,6 @@ gnl_object_reset (GnlObject * object)
 {
   GST_INFO_OBJECT (object, "Resetting child timing values to default");
 
-  object->seqnum = 0;
-  object->wanted_seqnum = 0;
   object->start = 0;
   object->duration = 0;
   object->stop = 0;

gnl/gnlobject.h

@@ -126,12 +126,6 @@ struct _GnlObject
   gint64 segment_stop;
 
   gboolean in_composition;
-
-  /* the seqnum we want, will be conciderd as real one right after
-   * a new segment */
-  gint wanted_seqnum; 
-  /*  The seqnum that we are working with, 0 if not set */
-  gint seqnum;
 };
 
 struct _GnlObjectClass