/*+
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* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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* This component and the accompanying materials are made available+
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* under the terms of "Eclipse Public License v1.0"+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Nokia Corporation - initial contribution.+
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*+
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* Contributors:+
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*+
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* Description:  Header file for EAacPlusUtil.cpp+
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*+
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*/+
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+
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+
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#ifndef 	EAACPLUSUTIL_H+
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#define 	EAACPLUSUTIL_H+
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+
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// INCLUDES+
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#include <e32base.h>+
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+
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// CLASS DECLARATION+
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class EAacpAudioFrameInfo;+
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+
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/**+
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*  This class implements utility functions to extract AAC frame+
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*  information.+
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*+
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*  @lib MmfEAacPlusUtil.lib+
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*  @since 3.2+
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*/+
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class CEAacPlusUtil : public CBase+
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	{+
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	public:+
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        // CONSTANTS+
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        enum TEAacPlusFormatType+
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	        {+
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		    EAacPlusFormatRaw=0,+
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		    EAacPlusFormatAdif=1,+
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		    EAacPlusFormatAdts=2+
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        	};+
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        /**+
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        *  EAAC+ frame info struct.+
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        *+
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        *  @lib MmfEAacPlusUtil.lib+
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        *  @since 3.2+
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        */+
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        class TEAacPlusFrameInfo+
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            {+
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        public:+
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	        TInt    	iOutFrameSize;			// Size of PCM Samples generated by decoder+
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            TInt    	iNoOfSamples;			// Number of PCM Samples generated by decoder per frame+
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            TInt    	iSamplingFrequency;		// Sampling freq of AAC Code decoder+
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            TInt		iNoOfChannels;			// No of output channel 1=Mono; 2=Stereo+
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        	TInt		iObjectType;			// MPEG Audio Object Type 2=AAC-LC; 4=AAC-LTP+
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        	TInt		iOutSamplingFrequency;  // Sampling Frequence for the output samples+
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        	TInt		iDownSampledMode;    	// 0=Normal Mode; 1=Down Sampled mode+
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        	TInt		iSbr;	                // 0=SBR not present; 1=SBR present+
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        	TInt		iPs;	                // 0=PS not present; 1=PS present+
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            };+
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+
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        class TEAacPlusFrameLenConfig+
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            {+
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        public:+
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			TEAacPlusFormatType iFormatType;	// Container type.+
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            TInt    	iSamplingFrequency;		// Sampling freq of AAC core decoder+
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        	TInt		iObjectType;			// MPEG Audio Object Type 2=AAC-LC; 4=AAC-LTP+
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            };+
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+
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+
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    public:  // Constructors and destructor+
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+
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        /**+
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        * Two-phased constructor.+
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        */+
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        IMPORT_C static CEAacPlusUtil* NewL();+
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+
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        /**+
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        * Destructor.+
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        */+
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        IMPORT_C virtual ~CEAacPlusUtil();+
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+
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    public: // New functions+
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+
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		/**+
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        * Used to get the format type.+
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        * @since 3.2+
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        * @param	aBuf                 buffer of AAC data from start of aac content+
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        * @param	aBufLen              length of aBuf+
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        * @param	TEAacPlusFormatType  returned format type 0=raw; 1=ADIF; 2=ADTS+
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        * @return   status+
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        */+
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        IMPORT_C TInt GetAacFormatType(const TUint8* aBuf, TInt aBufLen, TEAacPlusFormatType& aFormatType);+
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+
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		/**+
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        * Used to get the audio format information for ADIF and ADTS content.+
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        * Data should be provided beginning with start of aac content including header.+
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        * Enough data should follow the header to determine SBR and PS if needed.+
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        * Can be used with mpeg data where aHdrBuf will contain the AudioSpecificConfig. Implicit SBR and PS+
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        * will not be determined.+
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        * @since 3.2+
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        * @param	aHdrBuf buffer with AAC data beginning at start of aac content including ADIF or ADTS header+
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        * @param	aHdrLen length of aHdrBuf; header length is returned in this parameter+
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        * @param	aFrameInfo returns the format information+
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        * @return	status+
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        */+
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		IMPORT_C TInt GetAacFrameInfo (const TUint8* aHdrBuf, TInt& aHdrLen, TEAacPlusFrameInfo& aFrameInfo);+
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		+
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		/**+
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        * Used to get the audio format information for mpeg aac.+
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        * aHdrBuf will contain the AudioSpecificConfig. aDataBuf will contain data at beginning of raw audio frames.+
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        * Implicit SBR and PS can be determined.+
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        * @since 3.2+
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        * @param	aHdrBuf buffer with AudioSpecificConfig data.+
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        * @param	aHdrLen length of aHdrBuf+
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        * @param	aFrameInfo returns the format information+
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        * @param	aDataBuf buffer with raw audio frames+
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        * @param	aDataBufLen length of aDataBuf+
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        * @return	status+
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        */+
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		IMPORT_C TInt GetAacFrameInfo (const TUint8* aHdrBuf, TInt& aHdrLen, TEAacPlusFrameInfo& aFrameInfo,+
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									TUint8* aDataBuf, TInt aDataBufLen);+
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									+
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		/**+
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        * Used to get the size in bytes of the frame found at the start of aBuf.+
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        * @since 3.2+
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        * @param	aBuf buffer with AAC data frame+
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        * @param	aBufLen length of aBuf+
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        * @param	aFrameLen returns the frame size in bytes+
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        * @return   status+
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        */+
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		IMPORT_C TInt GetAacFrameLength(const TUint8* aBuf, TInt aBufLen, TInt& aFrameLen);+
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+
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		/**+
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        * Used to configure the utility with information needed to enable the apis.+
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        * This api can be used if GetAacFrameInfo is not used to initialize the utility.+
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        * @since 3.2+
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        * @param	aFormatType format type+
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        * @param	aSamplingFrequency sampling frequency+
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        * @return   status+
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        */+
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		IMPORT_C TInt Config(TEAacPlusFrameLenConfig& aFrameLenConfig);+
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+
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    private:+
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+
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        /**+
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        * C++ default constructor.+
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        */+
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        CEAacPlusUtil();+
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+
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        /**+
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        * By default Symbian 2nd phase constructor is private.+
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        */+
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        void ConstructL();+
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+
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 	private:	// Data+
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		TEAacPlusFormatType iFormat;+
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		EAacpAudioFrameInfo* iGetFrameLenParam;+
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		TBool iInitialized;+
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	};+
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+
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#endif      // EAACPLUSUTIL_H+
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+
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// End of File+
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