diff -r 000000000000 -r 0e761a78d257 gst_plugins_base/gst-libs/gst/audio/mixerutils.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/gst-libs/gst/audio/mixerutils.h	Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,54 @@
+/* GStreamer
+ * Copyright (C) 2005-2006 Tim-Philipp Müller <tim centricular net>
+ *
+ * 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.
+ */
+
+#ifndef __GST_AUDIO_MIXERUTILS_H__
+#define __GST_AUDIO_MIXERUTILS_H__
+
+#include <gst/gst.h>
+#include <gst/interfaces/mixer.h>
+
+G_BEGIN_DECLS
+
+/**
+ * GstAudioMixerFilterFunc:
+ * @mixer: a #GstElement implementing the #GstMixer interface
+ * @user_data: user data
+ *
+ * Function that will be called by gst_audio_default_registry_mixer_filter()
+ * so the caller can decide which mixer elements should be kept and returned.
+ * When the mixer element is passed to the callback function, it is opened
+ * and in READY state. If you decide to keep the element, you need to set it
+ * back to NULL state yourself (unless you want to keep it opened of course).
+ *
+ * Returns: TRUE if the element should be kept, FALSE otherwise.
+ */
+typedef gboolean (*GstAudioMixerFilterFunc) (GstMixer * mixer, gpointer user_data);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+
+
+GList * gst_audio_default_registry_mixer_filter (GstAudioMixerFilterFunc  filter_func,
+                                                 gboolean                 first,
+                                                 gpointer                 user_data);
+
+G_END_DECLS
+
+#endif /* __GST_AUDIO_MIXERUTILS_H__ */