bin: Only post EOS messages after reaching the PLAYING state

Fixes bug #647756.

gst/gstbin.c

@@ -202,6 +202,8 @@ struct _GstBinPrivate
   GstIndex *index;
   /* forward messages from our children */
   gboolean message_forward;
+
+  gboolean posted_eos;
 };
 
 typedef struct
@@ -226,6 +228,7 @@ static void bin_handle_async_done (GstBin * bin, GstStateChangeReturn ret,
     gboolean flag_pending);
 static void bin_handle_async_start (GstBin * bin, gboolean new_base_time);
 static void bin_push_state_continue (BinContinueData * data);
+static void bin_do_eos (GstBin * bin);
 
 static gboolean gst_bin_add_func (GstBin * bin, GstElement * element);
 static gboolean gst_bin_remove_func (GstBin * bin, GstElement * element);
@@ -950,10 +953,10 @@ bin_remove_messages (GstBin * bin, GstObject * src, GstMessageType types)
  *
  * call with bin LOCK */
 static gboolean
-is_eos (GstBin * bin)
+is_eos (GstBin * bin, guint32 * seqnum)
 {
   gboolean result;
-  GList *walk;
+  GList *walk, *msgs;
 
   result = TRUE;
   for (walk = bin->children; walk; walk = g_list_next (walk)) {
@@ -962,8 +965,10 @@ is_eos (GstBin * bin)
     element = GST_ELEMENT_CAST (walk->data);
     if (bin_element_is_sink (element, bin) == 0) {
       /* check if element posted EOS */
-      if (find_message (bin, GST_OBJECT_CAST (element), GST_MESSAGE_EOS)) {
+      if ((msgs =
+              find_message (bin, GST_OBJECT_CAST (element), GST_MESSAGE_EOS))) {
         GST_DEBUG ("sink '%s' posted EOS", GST_ELEMENT_NAME (element));
+        *seqnum = gst_message_get_seqnum (GST_MESSAGE_CAST (msgs->data));
       } else {
         GST_DEBUG ("sink '%s' did not post EOS yet",
             GST_ELEMENT_NAME (element));
@@ -2392,6 +2397,7 @@ gst_bin_change_state_func (GstElement * element, GstStateChange transition)
       GST_OBJECT_LOCK (bin);
       GST_DEBUG_OBJECT (element, "clearing EOS elements");
       bin_remove_messages (bin, NULL, GST_MESSAGE_EOS);
+      bin->priv->posted_eos = FALSE;
       GST_OBJECT_UNLOCK (bin);
       if (current == GST_STATE_READY)
         if (!(gst_bin_src_pads_activate (bin, TRUE)))
@@ -2586,6 +2592,8 @@ state_end:
       gst_element_state_get_name (GST_STATE (element)),
       gst_element_state_change_return_get_name (ret));
 
+  bin_do_eos (bin);
+
   return ret;
 
   /* ERRORS */
@@ -2699,6 +2707,9 @@ gst_bin_continue_func (BinContinueData * data)
 
   GST_STATE_UNLOCK (bin);
   GST_DEBUG_OBJECT (bin, "state continue done");
+
+  bin_do_eos (bin);
+
   gst_object_unref (bin);
   g_slice_free (BinContinueData, data);
   return;
@@ -2933,6 +2944,9 @@ bin_handle_async_done (GstBin * bin, GstStateChangeReturn ret,
     gst_element_post_message (GST_ELEMENT_CAST (bin), amessage);
   }
 
+  if (!cont)
+    bin_do_eos (bin);
+
   GST_OBJECT_LOCK (bin);
   if (cont) {
     /* toplevel, start continue state */
@@ -2965,6 +2979,33 @@ nothing_pending:
   }
 }
 
+static void
+bin_do_eos (GstBin * bin)
+{
+  guint32 seqnum = 0;
+  gboolean eos;
+
+  GST_OBJECT_LOCK (bin);
+  /* If all sinks are EOS, we're in PLAYING and no state change is pending
+   * we forward the EOS message to the parent bin or application
+   */
+  eos = GST_STATE (bin) == GST_STATE_PLAYING
+      && GST_STATE_PENDING (bin) == GST_STATE_VOID_PENDING
+      && is_eos (bin, &seqnum);
+  GST_OBJECT_UNLOCK (bin);
+
+  if (eos
+      && g_atomic_int_compare_and_exchange (&bin->priv->posted_eos, FALSE,
+          TRUE)) {
+    GstMessage *tmessage;
+    tmessage = gst_message_new_eos (GST_OBJECT_CAST (bin));
+    gst_message_set_seqnum (tmessage, seqnum);
+    GST_DEBUG_OBJECT (bin,
+        "all sinks posted EOS, posting seqnum #%" G_GUINT32_FORMAT, seqnum);
+    gst_element_post_message (GST_ELEMENT_CAST (bin), tmessage);
+  }
+}
+
 /* must be called with the object lock. This function releases the lock to post
  * the message. */
 static void
@@ -3073,28 +3114,15 @@ gst_bin_handle_message_func (GstBin * bin, GstMessage * message)
     }
     case GST_MESSAGE_EOS:
     {
-      gboolean eos;
 
       /* collect all eos messages from the children */
       GST_OBJECT_LOCK (bin);
       bin_do_message_forward (bin, message);
       /* ref message for future use  */
-      gst_message_ref (message);
       bin_replace_message (bin, message, GST_MESSAGE_EOS);
-      eos = is_eos (bin);
       GST_OBJECT_UNLOCK (bin);
 
-      /* if we are completely EOS, we forward an EOS message */
+      bin_do_eos (bin);
-      if (eos) {
-        seqnum = gst_message_get_seqnum (message);
-        tmessage = gst_message_new_eos (GST_OBJECT_CAST (bin));
-        gst_message_set_seqnum (tmessage, seqnum);
-
-        GST_DEBUG_OBJECT (bin,
-            "all sinks posted EOS, posting seqnum #%" G_GUINT32_FORMAT, seqnum);
-        gst_element_post_message (GST_ELEMENT_CAST (bin), tmessage);
-      }
-      gst_message_unref (message);
       break;
     }
     case GST_MESSAGE_STATE_DIRTY: