/*
* Copyright (c) 2009 Aricent and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of the License "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:
* Aricent - initial contribution.
*
* Contributors:
*
* Description:
* Plugin class for AacLC encoder. This class inherits CMMFCodec
* class and implements the pure virtual functions of CMMFCodec.
* The class also has a few private funtions.
*
*/


#ifndef ARIAACLCENCMMFCODEC_H
#define ARIAACLCENCMMFCODEC_H

#include <mmfcodec.h>

//Enum representing the output file format
enum TOutputFormat
    {
    EFormatRaw = 0,
    EFormatADIF = 1,
    EFormatADTS = 2
    };

//Class to hold encoder parameters
class TAacEncParam
    {
public:
    TUint iNumberOfChannels;
    TUint iSamplingFrequency;
    TUint iTurnOnPns;
    TUint iTurnOnTns;
    TUint iVersionInfo;
    TOutputFormat iOutputFormat;
    TUint iOutputBitRate;
    };

//Forward Declaration
class CAriAacLCEncWrapper;

//Class Declaration
class CAriAacLCEncMmfCodec:public CMMFCodec
    {
public: //constructors and destructors
	/**
	 * Two-phased constructor.
	 * @return pointer to an instance of CMMFCodec
	 */
	static CMMFCodec* NewL();

	/**> Destructor */
	~CAriAacLCEncMmfCodec();

public: // From CMMFCodec

    /**
     * From CMMFCodec
     * Sets codec configuration.
     * The configuration data is passed in as a descriptor of type TDesC8.
     * @param aConfigType
     * The UID of the configuration data.
     * @param aParam
     * Descriptor with frame info parameters in the form of RArray
     */
    virtual void ConfigureL( TUid aConfigType, const TDesC8& aParam );

    /**
    * From CMMFCodec
    * Codec reset function used to flush out status information when a
    * reposition occurs.
    * This is used if the codec requires resetting prior to use.
    */
    virtual void ResetL();

    /**
    * From CMMFCodec
    * Processes the data in the specified source buffer and writes the
    * processed data to the specified destination buffer.
    * This function is synchronous, when the function returns the data
    * has been processed. The source buffer is converted to the appropriate
    * coding type in the destination buffer. The buffers can be of any size,
    * therefore there is no guarantee that all the source buffer can be
    * processed to fill the destination buffer or that all the source buffer
    * may be processed before the destination is full. This function
    * therefore returns the number of source, and destination, bytes processed
    * along with a process result code indicating completion status.This
    * function is synchronous, when the function returns the data has been
    * processed. The source buffer is converted to the appropriate coding type
    * in the destination buffer. The buffers can be of any size, therefore
    * there is no guarantee that all the source buffer can be processed to
    * fill the destination buffer or that all the source buffer may be
    * processed before the destination is full. This function therefore
    * returns the number of source, and destination, bytes processed along
    * with a process result code indicating completion status.The aSource and
    * aSink buffers passed in are derived from CMMFBuffer. The buffer type
    * (e.g. a CMMFDataBuffer) passed in should be supported by the codec
    * otherwise this function should leave with KErrNotSupported. The
    * position of the source buffer should be checked by calling the source
    * buffer's Position() member which indicates the current source read
    * position in bytes. The codec should start processing from the current
    * source buffer read position. The position of the destination buffer
    * should be checked by calling the destination buffer's Position() method
    * which indicates the current destination write position in bytes.
    * The codec should start writing to the destination buffer at the current
    * destination buffer write position.This is a virtual function that each
    * derived class must implement.
    * @see enum TCodecProcessResult
    * @param  aSource
    *         The source buffer containing data to encode or decode.
    * @param  aDestination
    *         The destination buffer to hold the data after encoding or
    *         decoding.
    * @return The result of the processing.
    * @pre    The function ConfigureL() should have been called.
    */
    virtual TCodecProcessResult ProcessL( const CMMFBuffer& aSource,
                                                CMMFBuffer& aDestination );

private:

	/**
	 *  Default Constructor
	 */
	CAriAacLCEncMmfCodec();

	/**
	 *  Symbian 2nd phase constructor
	 */
	void ConstructL();

	/**
     * Update the result with result status, source bytes consumed
     * and destination bytes added.
     * @param   aStatus
     *          status of the result like EProcessComplete
     * @param   aSrcBytesConsumed
     *          total bytes consumed from the source buffer
     * @param   aDstBytesAdded
     *          total bytes added to the destination buffer
     * @return  result of the processing
     */
    TCodecProcessResult Result(
            TCodecProcessResult::TCodecProcessResultStatus aStatus,
            TInt aSrcBytesConsumed, TInt aDstBytesAdded );

    /**
     * Copy the bytes from internal output buffer to destination buffer
     * @param   aDst
     *          pointer to the destination buffer
     * @param   aDstBytesConsumed
     *          total bytes added to the destination buffer
     * @return  number of bytes copied to the destination buffer.
     */
    TInt CopyToDstBuffer( CMMFDataBuffer* aDst, TInt& aDstBytesConsumed );

    /**
     * Copy the bytes from the source buffer to the internal input burrer
     * @param   aSrc
     *          pointer to the source buffer
     * @param   aSrcBytesConsumed
     *          total bytes consumed from the source buffer
     * @return  number bytes copied from the source buffer
     */
    TInt CopyFromSrcBuffer(const CMMFDataBuffer* aSrc,
                        TInt& aSrcBytesConsumed );
    /**
     * Shifts the data in the input internal buffer to start position
     * @param   aFromPos
     *          position from where data has to shift
     * @param   aToPos
     *          position to where data has to shift
     */
    void ShiftData( TInt aFromPos, TInt aToPos );

private: //Data

	// Handle TO wrapper class
    CAriAacLCEncWrapper*    iCodec;

    TBool                   iConfigured;
    TBool                   iHeaderGenerated;
    TAacEncParam            iParam;
    //No of bytes of source to be provided to encoder to encode one frame
    TInt                    iSrclenToProcess;

    /**
     * Setting this flag indicates whether only one frame has to encoded at a
     * time or encode till destination buffer is full
     */
    TBool                   iFillBuffer;
    TInt                    iInternalInputBufferResidueLen;
    TInt                    iInternalOutputBufferResidueLen;
    TUint8*                 iInternalInputBuffer;
    TUint8*                 iInternalOutputBuffer;
    TInt                    iInternalOutputBufferPos;

    };

#endif /* ARIAACLCENCMMFCODEC_H */