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 "MMFpcmU8ToPcm16HwDevice.h"

    17 

    18 /**

    19  *

    20  *	Returns the created hw device for unsigned pcm8 to signed pcm16 audio.

    21  *

    22  *	@return	"CMMFPcmU8ToPcm16HwDevice"

    23  *

    24  */

    25 CMMFPcmU8ToPcm16HwDevice* CMMFPcmU8ToPcm16HwDevice::NewL()

    26 	{

    27     CMMFPcmU8ToPcm16HwDevice* self = new (ELeave) CMMFPcmU8ToPcm16HwDevice();

    28 	CleanupStack::PushL(self);

    29 	self->ConstructL();

    30 	CleanupStack::Pop(self);

    31 	return self;

    32 	}

    33 

    34 /**

    35  *

    36  *	Second phase constructor.

    37  *

    38  */

    39 void CMMFPcmU8ToPcm16HwDevice::ConstructL()

    40 	{

    41     iCodec = new (ELeave) CMMFPcmU8ToPcm16Codec();

    42 	}

    43 

    44 /**

    45 *

    46 * ~CMMFPcmU8ToPcm16HwDevice

    47 *

    48 */

    49 CMMFPcmU8ToPcm16HwDevice::~CMMFPcmU8ToPcm16HwDevice()

    50 	{

    51 	//The codec is deleted in the base class CMMFSwCodecWrapper

    52 	}

    53 

    54 /**

    55 *

    56 * Codec

    57 * @return 'CMMFSwCodec&'

    58 *

    59 */

    60 CMMFSwCodec& CMMFPcmU8ToPcm16HwDevice::Codec()

    61 	{

    62 	return *iCodec;

    63 	}

    64 

    65 /**

    66 *

    67 * ProcessL

    68 * @param aSource

    69 * @param aDst 

    70 * @return 'CMMFSwCodec::TCodecProcessResult'

    71 *

    72 */

    73 CMMFSwCodec::TCodecProcessResult CMMFPcmU8ToPcm16Codec::ProcessL(const CMMFBuffer& aSource, CMMFBuffer& aDest)

    74 	{

    75 	TCodecProcessResult result;

    76 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

    77 	

    78 	//convert from generic CMMFBuffer to CMMFDataBuffer

    79 	const CMMFDataBuffer* src = STATIC_CAST(const CMMFDataBuffer*, &aSource);

    80 	CMMFDataBuffer* dst = STATIC_CAST(CMMFDataBuffer*, &aDest);

    81 	

    82 	//[ check preconditions ]

    83 	if( !CheckPreconditions( src, dst ))

    84 		{

    85 		//[ precondition violation ]

    86 		User::Leave( KErrArgument );

    87 		}

    88 	

    89 	//we need to cast away CONST even on the source, as the TClass needs a TUint8*

    90 	TUint8* pSrc = CONST_CAST(TUint8*,src->Data().Ptr());

    91 	TUint8* pDst = CONST_CAST(TUint8*,dst->Data().Ptr());

    92 	

    93 	TInt srcUse = src->Data().Length();

    94 	TInt noSamples = srcUse;

    95 	iAudioU8ToS16Pcm.Convert(pSrc, pDst, noSamples );

    96 	

    97 	TInt dstBytesAdded = srcUse * 2;

    98 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

    99 	result.iSrcBytesProcessed  = srcUse;

   100 	result.iDstBytesAdded      = dstBytesAdded;

   101 	

   102 	dst->Data().SetLength(dstBytesAdded);

   103 	

   104 	//[ check post conditions ]

   105 	__ASSERT_DEBUG( (src->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));

   106 	__ASSERT_DEBUG( (dst->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));

   107 	__ASSERT_DEBUG( src->Data().Length() == dst->Data().Length()/2, TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); // 2 here signifies sizeof TInt16

   108 	__ASSERT_DEBUG( dst->Data().Length() % 2 == 0, TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); // pcm output

   109 	

   110 	return result;

   111 	}

   112 

   113 /**

   114 *

   115 * Preconditions

   116 * This methos tests the preconditions of the ProcessL method

   117 * @return TBool ETrue for sucess and EFalse for failure of the preconditions

   118 *

   119 **/

   120 TBool CMMFPcmU8ToPcm16Codec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )

   121 	{

   122 	TBool result = EFalse;

   123 	

   124 	if(! aSrcBuffer )

   125 		{

   126 		return result;

   127 		}

   128 	

   129 	if( ! aDestBuffer )

   130 		{

   131 		return result;

   132 		}

   133 	

   134 	// Check position of src and dest are 0

   135 	if( aSrcBuffer->Position() )

   136 		{

   137 		return result;

   138 		}

   139 	

   140 	// Check position of src and dest are 0

   141 	if( aDestBuffer->Position() )

   142 		{

   143 		return result;

   144 		}

   145 	

   146 	// check there are sufficient bytes in the output to consume the input

   147 	if( aSrcBuffer->Data().Length() * 2 > aDestBuffer->Data().MaxLength() )

   148 		{

   149 		return result;

   150 		}

   151 	

   152 	result = ETrue;  // preconditions have been satisfied

   153 	

   154 	return result;

   155 	}