1 // Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 #include <e32std.h>

    17 #include "mmfSwCodecUtility.h"

    18 

    19 

    20 

    21 /******************************************************************

    22  * CMMFSwCodecUtility

    23  ******************************************************************/

    24 CMMFSwCodecUtility::CMMFSwCodecUtility()

    25 	{

    26 	}

    27 

    28 

    29 CMMFSwCodecUtility::~CMMFSwCodecUtility()

    30 	{

    31 	}

    32 

    33 CMMFSwCodecUtility* CMMFSwCodecUtility::NewL()

    34 	{

    35 	CMMFSwCodecUtility* self = new(ELeave) CMMFSwCodecUtility();

    36 	CleanupStack::PushL(self);

    37 	self->ConstructL();

    38 	CleanupStack::Pop();

    39 	return self;

    40 	}

    41 

    42 void CMMFSwCodecUtility::ConstructL()

    43 	{

    44 	}

    45 

    46 void CMMFSwCodecUtility::ConfigAudioRamper(TInt64 aRampTime, TInt aSampleRate, TInt aChannels)

    47 	{

    48 	iRampSamples = I64LOW(((TInt64(aSampleRate) * aRampTime) /1000000 )); // Add this

    49 	iRampSamplesLeft = iRampSamples;

    50 	iChannels = aChannels;

    51 	iRampIncr = 0;

    52 	iSkip = ETrue;	                       

    53 	}

    54 

    55 TBool CMMFSwCodecUtility::RampAudio(CMMFDataBuffer* aBuffer)

    56 	{

    57 	TInt i=0;

    58 	TInt length = aBuffer->Data().Length()>>1;

    59 	TInt16* sample = REINTERPRET_CAST(TInt16*,&aBuffer->Data()[0]);

    60 	TInt64 theResult(0);

    61 	while ((i < length) && (iRampIncr < iRampSamples))

    62 		{

    63 		theResult = sample[i];

    64 		theResult *= iRampIncr;

    65 		theResult /= iRampSamples;

    66 		sample[i] = STATIC_CAST(TInt16, I64LOW(theResult) );

    67           

    68 		if ((iChannels == 1) || (!iSkip))

    69 			{

    70 			iRampIncr++;

    71 			}

    72 		iSkip = !iSkip;

    73 		i++;

    74 		}

    75 

    76 	if (iRampIncr < iRampSamples)

    77 		return ETrue;

    78 	else

    79 		return EFalse;

    80 

    81 	}

    82