/*

* Copyright (c) 2006 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:  The functions in this module implements the specific behavior

*                for the advanced audio converter class for configuration of

*				 hardware accelerated codec.

*

*/

// INCLUDE FILES

#include "MP3AudioPlayControllerDecoder.h"

#include "DebugMacros.h"

#include <Mmfcodec.h>

const TUint KRawMp3MaxFrameSize  = 1441;

const TUint KSizeOfInBuffer   = 2*KRawMp3MaxFrameSize;

const TInt 	KRawMp3FrameHeaderSize = 5;

class TAudioFrameInfo

    {

	public:

		TInt iMode;            // encoding mode

		TInt iBitRate;         // bitrate (bit/s)

		TInt iSamplingRate;    // sampling frequency (Hz)

		TInt iChannels;        // number of channels

		TInt iFrameSize;       // encoded size (bytes)

		TInt iFrameSamples;    // samples per frame

		TInt iSamplingRateOut; // sampling frequency after conversion (Hz)

		TInt iChannelsOut;     // number of audio channels after conversion (1 or 2)

		TInt iFrameSamplesOut; // decoded size after conversion (samples per frame)

		TInt iPadding;         // padding flag (TRUE or FALSE, TRUE if p slot exists)

		TInt iId;              // id of algorithm (1 MPEG-1, 0 MPEG-2)

    };

// Bit rates in bits/sec supported by MPEG2, MPEG1 and MPEG2.5 respectively

const TInt16 cBitRateTable[3][16] =

	{

		{-1,8,16,24,32,40,48,56,64,80,96,112,128,144,160,0},

		{-1,32,40,48,56,64,80,96,112,128,160,192,224,256,320,0},

		{-1,8,16,24,32,40,48,56,64,80,96,112,128,144,160,0},

	};

// Sampling frequencies supported by MPEG2, MPEG1 and MPEG2.5 respectively

const TUint16 cSamplingFrequencyTable[3][4] =

	{

		{22050,24000,16000,0},

		{44100,48000,32000,0},

		{11025,12000,8000,0},

	};

// ============================ MEMBER FUNCTIONS ===============================

// -----------------------------------------------------------------------------

// C++ default constructor can NOT contain any code, that

// might leave.

// -----------------------------------------------------------------------------

//

CMP3AudioPlayControllerDecoder::CMP3AudioPlayControllerDecoder()

    :   CAdvancedAudioDecoder(CActive::EPriorityStandard)

    {

    DP0(_L("CMP3AudioPlayControllerDecoder::CMP3AudioPlayControllerDecoder - Hardware Accelerated"));

    iMaxFrameSize = KRawMp3MaxFrameSize;

   	iSizeOfInBuffer = KSizeOfInBuffer;

    }

// -----------------------------------------------------------------------------

// CMP3AudioPlayControllerDecoder::ConstructL

// Symbian 2nd phase constructor can leave.

// -----------------------------------------------------------------------------

//

void CMP3AudioPlayControllerDecoder::ConstructL()

    {

    DP1(_L("CMP3AudioPlayControllerDecoder::ConstructL"), this);

    iFrameTable = CFrameTable::NewL();

	RenderEnable();

	UnMarkPlayEnd();

	Enable();

    CActiveScheduler::Add(this);

    }

// -----------------------------------------------------------------------------

// C++ default constructor can NOT contain any code, that

// might leave.

// -----------------------------------------------------------------------------

//

CMP3AudioPlayControllerDecoder* CMP3AudioPlayControllerDecoder::NewL()

    {

    DP0(_L("CMP3AudioPlayControllerDecoder::NewL"));

    CMP3AudioPlayControllerDecoder* self = new(ELeave) CMP3AudioPlayControllerDecoder();

    CleanupStack::PushL(self);

    self->ConstructL();

    CleanupStack::Pop(self);

    return self;

    }

// Destructor

CMP3AudioPlayControllerDecoder::~CMP3AudioPlayControllerDecoder()

	{

    DP0(_L("CMP3AudioPlayControllerDecoder::~CMP3AudioPlayControllerDecoder"));

    delete iFrameTable;

	}

TInt CMP3AudioPlayControllerDecoder::CodecConfig(RArray<TInt>& aConfigData)

	{

	TInt status = KErrNone;

	TInt sampFreq = ((RArray<TInt>&) aConfigData)[5];

	TInt samplesPerFrame = ((RArray<TInt>&) aConfigData)[8];

	iFrameTable->InitFrameTable(sampFreq, samplesPerFrame);

	return status;

	}

// -----------------------------------------------------------------------------

// CMP3AudioPlayControllerDecoder::ResetL

// Resets configuration data and configures the codec.

// -----------------------------------------------------------------------------

//

void CMP3AudioPlayControllerDecoder::ResetL()

	{

    DP0(_L ("CMP3AudioPlayControllerDecoder::Reset - Enter"));

	delete[] iOutBuffer;

   	delete[] iInBuffer;

   	iInBuffer = NULL;

   	iOutBuffer = NULL;

   	iInBufferCount = 0;

   	iOutBufferCount = 0;

   	iOutBufferPtr = NULL;

   	iOutFrameLength = KRawMp3MaxFrameSize; // since data is not decoded

   	iInBuffer = new (ELeave) TUint8[KSizeOfInBuffer];

    iOutBuffer = new (ELeave) TUint8[iOutFrameLength];

    iOutBufferPtr = iOutBuffer;

    iAccLen = 0;

    iEnabled = ETrue; 

    DP0(_L ("CMP3AudioPlayControllerDecoder::Reset - Exit"));

	}

TCodecProcessResult CMP3AudioPlayControllerDecoder::ProcessL(CMMFBuffer& aSrc, CMMFBuffer& aDst)

	{

    DP0(_L ("CMP3AudioPlayControllerDecoder::ProcessL"));

	return CAdvancedAudioDecoder::ProcessHwL(aSrc, aDst);

	}

TInt CMP3AudioPlayControllerDecoder::FrameLength(const TUint8* aBuf, TInt aBufLen, TInt& aFrameLength)

	{

	TInt stat = KErrNone;

	TAudioFrameInfo info;

	TInt len = FrameInfo(aBuf, aBufLen, info);

	if (len > 0)

		{

		aFrameLength = len;

		}

	else

		{

		stat = KErrUnknown;

		}

	return stat;

	}

// -----------------------------------------------------------------------------

// CMP3AudioPlayControllerDecoder::FrameInfo

// -----------------------------------------------------------------------------

//

TInt CMP3AudioPlayControllerDecoder::FrameInfo(

	const TUint8* aBuf,

	TInt aBufLen,

	TAudioFrameInfo& aInfo)

    {

    TInt length = 0;

    TUint temp;

    TUint lTempVal;

	if (aBufLen >= KRawMp3FrameHeaderSize)

	    {

		// Extract header fields to aInfo and check their bit syntax

		// (including the sync word!). If the syntax is not OK the length

		// is set to zero.

		temp = 0;

		temp = aBuf[0] << 24;

		temp |= (aBuf[1] << 16);

		temp |= (aBuf[2] << 8);

		temp |= aBuf[3];

		if (((temp >> 21) & 0x7FF) != 0x7FF)

			{

			return length;

			}

		lTempVal = (temp >> 19) & 0x03;

		switch (lTempVal)

			{

			case 0:

				aInfo.iId = 2;  // MPEG2.5

				aInfo.iFrameSamples = 576;

				break;

			case 1:

				return length;

			case 2:

				aInfo.iId = 0;  // MPEG 2

				aInfo.iFrameSamples = 576;

				break;

			case 3:

				aInfo.iId = 1;  // MPEG 1

				aInfo.iFrameSamples = 1152;

				break;

			}

		lTempVal = (temp >> 17) & 0x03;

		if (lTempVal != 1)

			{

			return length;

			}

		lTempVal = (temp >> 12) & 0x0F;

		aInfo.iBitRate = cBitRateTable[aInfo.iId][lTempVal]*1000;

		if (aInfo.iBitRate == 0)

			{

			return length;

			}

		lTempVal = (temp >> 10) & 0x03;

		if (lTempVal == 3)

			{

			return length;

			}

		else

			{

			aInfo.iSamplingRate = cSamplingFrequencyTable[aInfo.iId][lTempVal];

			}

		aInfo.iPadding = (temp >> 9) & 0x01;

		lTempVal = (temp >> 6) & 0x03;

		aInfo.iMode = lTempVal;

		if (lTempVal == 3)

			{

			aInfo.iChannels = 1;

			}

		else

            {

            aInfo.iChannels = 2;

            }

        aInfo.iSamplingRateOut = aInfo.iSamplingRate;

        aInfo.iChannelsOut = 2; /* always set to stereo output */

        aInfo.iFrameSamplesOut = aInfo.iFrameSamples;

		if (aInfo.iBitRate == -1)

			{

			// For free mode operation

			length = KRawMp3MaxFrameSize;

			}

		if (aInfo.iSamplingRate > 0  &&  aInfo.iBitRate > 0)

			{

			length = (144*aInfo.iBitRate)/aInfo.iSamplingRate;

			if (aInfo.iId != 1)

				{

				length >>= 1; /*for MPEG2 and MPEG2.5 */

				}

			if (aInfo.iPadding)

				{

				length++;

				}

			}

		aInfo.iFrameSize = length;

//        iChannelsOut = aInfo.iChannelsOut;

    	}

    return length;

    }

// -----------------------------------------------------------------------------

// CMP3AudioPlayControllerDecoder::SeekSync

// -----------------------------------------------------------------------------

TInt CMP3AudioPlayControllerDecoder::SeekSync(TUint8* aBuf, TInt aBufLen)

    {

    const TInt KMaxFrames = 3;          // number of frames to check

    const TInt KNotFound = aBufLen;     // sync not found position

    TAudioFrameInfo frameInfo;           // frame parameters

    TInt i = 0;

    TInt syncPos = KNotFound;

    TInt maxSeek = KMaxFrames;

    const TUint8* endPtr = aBuf+aBufLen;

    // Seek a valid frame candidate byte by byte until a valid frame

    // is found or all bytes have been checked.

    while (aBuf < endPtr  &&  syncPos == KNotFound)

	    {

        TInt seekCount = 0;

        const TUint8* framePtr = aBuf;

        TInt frameBufLen = aBufLen;

        syncPos = i;

		// Check the validity of this frame candidate and the nearest next

        // frames. If they are not OK, syncPos will be set to KNotFound.

        while (framePtr < endPtr  &&  syncPos != KNotFound  && seekCount < maxSeek)

	        {

            TInt length = FrameInfo(framePtr, frameBufLen, frameInfo);

			if (length == 0)

            	{

                syncPos = KNotFound;

				}

            if ((length > 0) && (frameInfo.iBitRate < 0))

            	{

                maxSeek = 1; // free formatcase

				}

            framePtr += length;

            frameBufLen -= length;

            seekCount++;

			// consider SYNC not found if we reach end of buffer before finding 3 SYNC frames

			if ((framePtr >= endPtr) && (seekCount < maxSeek))

				{

				syncPos = KNotFound;

				aBuf += (aBufLen-1);      // force an exit from while loop

				}

        	}

        aBuf++; aBufLen--; i++;

    	}

    return syncPos;

    }

// -----------------------------------------------------------------------------

// CMP3AudioPlayControllerDecoder::IsHwAccelerated

// Always return true when no soft codec is used.

// -----------------------------------------------------------------------------

//

TBool CMP3AudioPlayControllerDecoder::IsHwAccelerated()

	{

	return ETrue;

	}

TInt CMP3AudioPlayControllerDecoder::CodecCmd(TCodecCmd /*aCmd*/)

	{

	return KErrNotSupported;

	}

// End of file