nlecomposition: De-duplicate seek events based on their sequence number

If there are e.g. multiple video sinks, we would get the same seek event
multiple times. But we only want to handle it once.

https://bugzilla.gnome.org/show_bug.cgi?id=774149

diff --git a/plugins/nle/nlecomposition.c b/plugins/nle/nlecomposition.c
index 4ee83e6..b817876 100644 (file)
--- a/plugins/nle/nlecomposition.c
+++ b/plugins/nle/nlecomposition.c
@@ -784,7 +784,7 @@ _free_action (gpointer udata, Action * action)
 }
 
 static void
-_add_action (NleComposition * comp, GCallback func,
+_add_action_locked (NleComposition * comp, GCallback func,
     gpointer data, gint priority)
 {
   Action *action;
@@ -798,7 +798,6 @@ _add_action (NleComposition * comp, GCallback func,
   action->priority = priority;
   g_closure_set_marshal ((GClosure *) action, g_cclosure_marshal_VOID__VOID);
 
-  ACTIONS_LOCK (comp);
   GST_INFO_OBJECT (comp, "Adding Action for function: %p:%s",
       action, GST_DEBUG_FUNCPTR_NAME (func));
 
@@ -811,23 +810,61 @@ _add_action (NleComposition * comp, GCallback func,
       g_list_length (priv->actions));
 
   SIGNAL_NEW_ACTION (comp);
+}
+
+static void
+_add_action (NleComposition * comp, GCallback func,
+    gpointer data, gint priority)
+{
+  ACTIONS_LOCK (comp);
+  _add_action_locked (comp, func, data, priority);
   ACTIONS_UNLOCK (comp);
 }
 
 static void
 _add_seek_action (NleComposition * comp, GstEvent * event)
 {
-  SeekData *seekd = g_slice_new0 (SeekData);
+  SeekData *seekd;
+  GList *tmp;
+  guint32 seqnum = gst_event_get_seqnum (event);
+
+  ACTIONS_LOCK (comp);
+  /* Check if this is our current seqnum */
+  if (seqnum == comp->priv->next_eos_seqnum) {
+    GST_DEBUG_OBJECT (comp, "Not adding Action, same seqnum as previous seek");
+    ACTIONS_UNLOCK (comp);
+    return;
+  }
+
+  /* Check if this seqnum is already queued up but not handled yet */
+  for (tmp = comp->priv->actions; tmp != NULL; tmp = tmp->next) {
+    Action *act = tmp->data;
+
+    if (ACTION_CALLBACK (act) == G_CALLBACK (_seek_pipeline_func)) {
+      SeekData *tmp_data = ((GClosure *) act)->data;
+
+      if (gst_event_get_seqnum (tmp_data->event) == seqnum) {
+        GST_DEBUG_OBJECT (comp,
+            "Not adding Action, same seqnum as previous seek");
+        ACTIONS_UNLOCK (comp);
+        return;
+      }
+    }
+  }
+
 
   GST_DEBUG_OBJECT (comp, "Adding Action");
 
+  seekd = g_slice_new0 (SeekData);
   seekd->comp = comp;
   seekd->event = event;
 
   comp->priv->next_eos_seqnum = 0;
   comp->priv->real_eos_seqnum = 0;
-  _add_action (comp, G_CALLBACK (_seek_pipeline_func), seekd,
+  _add_action_locked (comp, G_CALLBACK (_seek_pipeline_func), seekd,
       G_PRIORITY_DEFAULT);
+
+  ACTIONS_UNLOCK (comp);
 }
 
 static void
@@ -1531,7 +1568,7 @@ static gboolean
 seek_handling (NleComposition * comp, gint32 seqnum,
     NleUpdateStackReason update_stack_reason)
 {
-  GST_DEBUG_OBJECT (comp, "Seek hanlding update pipeline reason: %s",
+  GST_DEBUG_OBJECT (comp, "Seek handling update pipeline reason: %s",
       UPDATE_PIPELINE_REASONS[update_stack_reason]);
 
   if (have_to_update_pipeline (comp, update_stack_reason)) {