--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mmmw_plat/telephony_multimedia_service_api/inc/tmsstreamobsrvr.h	Tue Feb 02 01:08:46 2010 +0200
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+ * All rights reserved.
+ * This component and the accompanying materials are made available
+ * under the terms of "Eclipse Public License v1.0"
+ * which accompanies this distribution, and is available
+ * at the URL "http://www.eclipse.org/legal/epl-v10.html".
+ *
+ * Initial Contributors:
+ * Nokia Corporation - initial contribution.
+ *
+ * Contributors:
+ *
+ * Description: Telephony Multimedia Service
+ *
+ */
+
+#ifndef TMS_STREAM_OBSRVR_H
+#define TMS_STREAM_OBSRVR_H
+
+// Include files
+#include <tms.h>
+
+namespace TMS {
+
+// Forward declarations
+class TMSStream;
+
+/**
+ * TMSStreamObserver class
+ *
+ * This class provides callback mechanism for TMSStream listeners.
+ *
+ * Client class that is interested in observing stream notifications has to
+ * inherit from TMSStreamObserver class and register itself with the TMSStream.
+ * Functions declared in this class are called when events occur in TMSStream.
+ *
+ * The client must not do any blocking, or perform any CPU-intensive operations
+ * in the callback methods. It is recommended that the client saves event data,
+ * returns from this function immediately, and if necessary, responds to
+ * the event in asynchronous way.
+ *
+ * Usage:
+ * <code>
+ * // Register as an observer to the uplink stream
+ * iUplinkStream->AddObserver(*this, NULL);
+ * ...
+ * // Unregister (optional)
+ * iUplinkStream->RemoveObserver(*this);
+ * ...
+ * </code>
+ *
+ * @lib tmsapi.lib
+ *
+ */
+class TMSStreamObserver
+    {
+public:
+    /**
+     * Signal stream event.
+     *
+     * This function is called when a stream event occurs.
+     *      (1) TMS_EVENT_TYPE_STATE_CHANGED.
+     *
+     *
+     * @param  stream
+     *      Pointer to the object that is being signaled.
+     *
+     * @param  event
+     *      Event descriptor.
+     *
+     */
+    virtual void TMSStreamEvent(TMSStream* stream, TMSSignalEvent event) = 0;
+    };
+
+} //namespace TMS
+
+#endif // TMS_STREAM_OBSRVR_H
+
+// End of file