diff -r 000000000000 -r bde4ae8d615e os/mm/devsound/a3facf/inc/maudiocodec.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/os/mm/devsound/a3facf/inc/maudiocodec.h	Fri Jun 15 03:10:57 2012 +0200
@@ -0,0 +1,126 @@
+/*
+* Copyright (c) 2006-2009 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:
+*
+*/
+
+
+
+
+/**
+ @file
+ @publishedPartner
+ @released
+*/
+
+#ifndef MAUDIOCODEC_H
+#define MAUDIOCODEC_H
+
+#include <a3f/a3fbase.h>
+#include <a3f/maudioprocessingunit.h>
+#include <a3f/maudiocodecobserver.h>
+
+
+/**
+ * A generic abstract interface for codecs.
+ *
+ * The client must add a codec to a stream for operation.
+ * The codec can only be added to a stream when the codec is in uninitialized state.
+ * The codec can only be removed from a stream when the codec is in uninitialized or dead states.
+ */
+class MAudioCodec
+	{
+	public:
+	
+	/**
+	 * Sets the codec format.
+	 *
+	 * For encoders this sets the output format.
+	 * For decoders this configures the input format.
+	 * Format must be set before the codec can transfer to initialized state.
+	 *
+	 * @param aFormat codec format.
+	 * @return An error code. KErrNone on success, otherwise one of the system wide error codes.
+	 */
+	virtual TInt SetFormat(TUid aFormat)=0;
+
+	/**
+	* Sets the sample rate in samples/sec.
+	*
+	* sets the sample rate of the encoded data,
+	* and says nothing about the sample rate used on the output device
+	* or whether re-sampling is required that is up to the adaptation.
+	* the result of the operation is returned by MAudioCodecObserver::SampleRateSet().
+	*
+	* @param aSampleRate sample rate to be used, in samples/sec.
+	* @return An error code. KErrNone on success, otherwise one of the system wide error codes.
+	*/
+	virtual TInt SetSampleRate(TInt aSampleRate)=0;
+
+	/**
+	* Sets the mode, e.g. mono/stereo. 
+	* The result of the operation is returned by MAudioCodecObserver::ModeSet().
+	*
+	* @param aMode uid stating the mode.
+	* @return An error code. KErrNone on success, otherwise one of the system wide error codes.
+	*/
+	virtual TInt SetMode(TUid aMode)=0;
+
+	/**
+	* This returns a list of supported sample rates. The list need just include those of the standard list 
+	* that are supported. Includes rates supported by sample rate conversion. 
+	* GetSupportedSampleRatesComplete() callback shows result.
+	* TODO Need to document that the implementation is responsible for calling Reset() on aSupportedRates.
+	*
+	* @param aSupportedRates array that is populated with the supported rates list.
+	* @return An error code. KErrNone on success, otherwise one of the system wide error codes.
+	*/
+	virtual TInt GetSupportedSamplesRates(RArray<TInt>& aSupportedRates)=0;
+
+	/**
+	* This returns a list of supported sample modes. The list corresponds to the current configuration 
+	* and support may include the use of mono/stereo conversion etc. 
+	* GetSupportedModesComplete() callback shows result.
+	* TODO Need to document that the implementation is responsible for calling Reset() on aSupportedModes.
+	*
+	* @param aSupportedModes array that is populated with the supported modes list.
+	* @return An error code. KErrNone on success, otherwise one of the system wide error codes.
+	*/
+	virtual TInt GetSupportedModes(RArray<TUid>& aSupportedModes)=0;
+
+	/**
+	* Registers an audio codec observer.
+	*
+	* Note that this function is meant for clients of the Audio codec. 
+	* The client should unregister using UnregisterAudioCodecObserver() when applicable
+	*
+	* @param aObserver reference to the observer to register.
+	* @return an error code. KErrNone if successful.
+	*				KErrAlreadyExists if the client is already registered.
+	*				KErrOutOfMemory in case of memory exhaustion.
+	*/
+	virtual TInt RegisterAudioCodecObserver(MAudioCodecObserver& aObserver)=0;
+
+	/**
+	* Unregisters an audio codec observer.
+	*
+	* @param aObserver reference to the observer to unregister.
+	* @return an error code.  KErrNone if successful.
+	* 						KErrNotFound if the client has not been registered as observer.
+	*/
+	virtual void UnregisterAudioCodecObserver(MAudioCodecObserver& aObserver)=0;
+
+	};
+
+#endif // MAUDIOCODEC_H