From c967174c17039aa6ff6f03729852c5dc5a99a262 Mon Sep 17 00:00:00 2001
From: Andy Wingo <wingo@pobox.com>
Date: Sat, 14 May 2005 15:54:49 +0000
Subject: [PATCH] gst/gstbin.c (gst_bin_change_state): Fix state changes if a
 bin has no sinks.

Original commit message from CVS:
2005-05-14  Andy Wingo  <wingo@pobox.com>

* gst/gstbin.c (gst_bin_change_state): Fix state changes if a bin
has no sinks.
---
 ChangeLog                     | 5 +++++
 docs/gst/tmpl/gstelement.sgml | 1 +
 gst/gstbin.c                  | 8 ++++++++
 3 files changed, 14 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index bd0ac3df8e..f54a6fb2c2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2005-05-14  Andy Wingo  <wingo@pobox.com>
+
+	* gst/gstbin.c (gst_bin_change_state): Fix state changes if a bin
+	has no sinks.
+
 2005-05-13  Andy Wingo  <wingo@pobox.com>
 
 	* gst/gstutils.c (gst_element_link_pads): Instead of calling
diff --git a/docs/gst/tmpl/gstelement.sgml b/docs/gst/tmpl/gstelement.sgml
index 59986574a0..9f058d3b26 100644
--- a/docs/gst/tmpl/gstelement.sgml
+++ b/docs/gst/tmpl/gstelement.sgml
@@ -229,6 +229,7 @@ This enum defines the standard flags that an element may have.
 @GST_ELEMENT_SCHEDULER_PRIVATE1: 
 @GST_ELEMENT_SCHEDULER_PRIVATE2: 
 @GST_ELEMENT_LOCKED_STATE: 
+@GST_ELEMENT_IS_SINK: 
 @GST_ELEMENT_FLAG_LAST: 
 
 <!-- ##### MACRO GST_ELEMENT_NAME ##### -->
diff --git a/gst/gstbin.c b/gst/gstbin.c
index 090b994bef..46d0a55821 100644
--- a/gst/gstbin.c
+++ b/gst/gstbin.c
@@ -899,6 +899,14 @@ restart:
   }
   GST_UNLOCK (bin);
 
+  /* can be the case for a bin like ( identity ) */
+  if (g_queue_is_empty (elem_queue) && !g_queue_is_empty (temp)) {
+    GQueue *q = elem_queue;
+
+    elem_queue = temp;
+    temp = q;
+  }
+
   /* second step, change state of elements in the queue */
   while (!g_queue_is_empty (elem_queue)) {
     GstElement *qelement;