/*

* Copyright (c) 2010 Ixonos Plc.

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the "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:

* Ixonos Plc

*

* Description:  

*

*/

#ifndef __CPROCProcDecoder_H__

#define __CPROCProcDecoder_H__

#include <e32base.h>

#include <f32file.h>

#include <MMFCodec.h>

#include "AudCommon.h"

#include "ProcConstants.h"

#include "RateConverter.h"

class CProcDecoder : public CBase

    {

public:

    /*

    * Symbian constructors

    *

    */

    static CProcDecoder* NewL();

    static CProcDecoder* NewLC();

    /*

    * Destructor

    */

    ~CProcDecoder();

    /*

    * Initialize the decoder

    *

    * @param aProperties            properties of the input clip (in compressed domain)

    * @param aTargetSamplingRate    sampling rate to decode to

    * @param aChannelMode           channel mode to decode to

    *

    * @return ETrue if successful

    *

    */

    TBool InitL(TAudFileProperties aProperties, TInt aTargetSamplingRate, TChannelMode aChannelMode);

    /*

    * Feed the encoder

    *

    * @param    aEncFrame   encoded input frame

    * @param    aDecbuffer  buffer for decoded output data

    *

    * @return   ETrue if output was generated, EFalse if more data is needed

    */

    TBool FillDecBufferL(const HBufC8* aEncFrame, HBufC8*& aDecBuffer);

protected:

    // constructL    

    void ConstructL();

    // C++ constructor

    CProcDecoder();

    // configure AAC decoder

    // configure AAC Plus decoder

    void ConfigureAACPlusDecoderL();

    // configure MP3 decoder

    void ConfigureMP3DecoderL();

    // if input buffer is too small

    void ReAllocBufferL( CMMFDataBuffer* aBuffer, TInt aNewMaxSize );

    // feed the codec

    void FeedCodecL( CMMFCodec* aCodec, CMMFDataBuffer* aSourceBuffer, CMMFDataBuffer* aDestBuffer );

    // decode

    TCodecProcessResult DecodeL( CMMFCodec* aCodec, CMMFDataBuffer* aInBuffer, CMMFDataBuffer* aOutBuffer);

    // is supported dest codec?

    TBool GetIsSupportedSourceCodec();

    // set source codec

    void SetSourceCodecL();

    // is codec available?

    TBool CheckIfCodecAvailableL(const TDesC8& aCodecFourCCString, const TUid& aCodecUId );

    // update output buffer

    TBool UpdateOutputBufferL(CMMFDataBuffer* aInBuffer);

 protected:

    // properties of the input data

    TAudFileProperties iProperties;

    // a flag to indicate if decoding can take place

    TBool iReady;

    // Input buffer for decoder.

    CMMFDataBuffer* iSourceInputBuffer;

    // Input buffer for encoder (alternative output buffer for decoder).

    CMMFDataBuffer* iDestInputBuffer;

    CMMFDataBuffer* iSampleRateChannelBuffer;

    // Codec used in decoding input audio to PCM16

    CMMFCodec* iSourceCodec;

    // Channel and sample rate converter

    CRateConverter* iRateConverter;    

    // Whether audio converter needs to do channel and/or samplerate conversion.

    TBool iDoSampleRateChannelConversion;

    // Whether decoding is required (not required if input is WAV)

    TBool iDoDecoding;

    // Samplerate to convert from.

    TInt iFromSampleRate;

    // Samplerate to convert to.

    TInt iToSampleRate;

    // Number of channels in input.

    TInt iFromChannels;

    // Number of channels in output.

    TInt iToChannels;

    // a pointer to store output buffer

    HBufC8* iDecBuffer;

    // decimation factor for decoder

    TInt iDecimFactor;

    };

#endif