diff -r 000000000000 -r ff3acec5bc43 musichomescreen_multiview/mcpmusicplayer/inc/aiplayerpluginengineobserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/musichomescreen_multiview/mcpmusicplayer/inc/aiplayerpluginengineobserver.h	Thu Dec 17 08:45:05 2009 +0200
@@ -0,0 +1,104 @@
+/*
+* 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:  Music Player stautus observer
+*
+*/
+
+
+#ifndef M_AIPLAYERPLUGINENGINEOBSERVER_H
+#define M_AIPLAYERPLUGINENGINEOBSERVER_H
+
+#include <e32std.h>
+
+
+/**
+ *  Player state.
+ */
+enum TMPlayerState
+    {
+    EMPlayerStatePlaying,
+    EMPlayerStatePaused,
+    EMPlayerStateSeeking,
+    EMPlayerStateOther,
+    EMPlayerStateStarting,
+    EMPlayerStateStopped
+    };
+
+class CFbsBitmap;
+
+/**
+ *  Observer interface to be implemented by a client of AiPlayerPluginEngine.
+ *
+ *  @lib aiplayerplugin2.lib
+ *  @since S60 5.0
+ */
+class MAiPlayerPluginEngineObserver
+    {
+public:
+
+    /**
+     * Called when active player instance's state changes
+     *
+     * @since S60 5.0
+     * @param aState Active player state
+     * @see TMPlayerState
+     */
+    virtual void PlayerStateChanged( TMPlayerState aState ) = 0;
+
+    /**
+     * Called when track info changes (i.e. track changes or current track's
+     * info is updated) in the active player instance.
+     *
+     * @since S60 5.0
+     * @param aTitle Current track's title.
+     * @param aArtist Current track's artist.
+     */
+    virtual void TrackInfoChanged( const TDesC& aTitle, 
+            const TDesC& aArtist ) = 0;
+
+    /**
+     * Called each second during playback.
+     *
+     * @since S60 5.0
+     * @param aPosition Current playback position in seconds.
+     */
+    virtual void PlaybackPositionChanged( TInt aPosition ) = 0;
+
+    /**
+     * Called when album art is ready or when there is no album art.
+     *
+     * @since S60 5.0
+     * @param aBitmap the new album art.
+     */
+    virtual void AlbumArtChanged( CFbsBitmap* aBitmap ) = 0;
+    
+    /**
+     * Called When there is an ongoing operation.
+     *
+     * @since S60 5.0
+     */
+    virtual void Opening() = 0;
+    
+    /**
+     * Called when to indicate that the playlist changed and it is empty.
+     *
+     * @since S60 5.0
+     * @param aBitmap the new album art.
+     */
+    virtual void PlaylisIsEmpty() = 0;
+
+    };
+
+
+#endif // ?M_AIPLAYERPLUGINENGINEOBSERVER_H