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 "mmfpcmU16TopcmS16HwDevice.h"

    17 

    18 /**

    19  *

    20  *	Returns the created hw device for passing audio through audio.

    21  *  for the wins implementation this would always be pcm16 although

    22  *  this is effectively a null hw device that will pass any datatype through

    23  *	@return	"CMMFPcm16ToPcmU16BEHwDevice"

    24  *

    25  */

    26 CMMFPcmU16ToPcm16HwDevice* CMMFPcmU16ToPcm16HwDevice::NewL()

    27 	{

    28     CMMFPcmU16ToPcm16HwDevice* self = new (ELeave) CMMFPcmU16ToPcm16HwDevice();

    29 	CleanupStack::PushL(self);

    30 	self->ConstructL();

    31 	CleanupStack::Pop(self);

    32 	return self;

    33 	}

    34 

    35 /**

    36 *

    37 * ~CMMFPcmU16ToPcm16HwDevice

    38 *

    39 */

    40 CMMFPcmU16ToPcm16HwDevice::~CMMFPcmU16ToPcm16HwDevice()

    41 	{

    42 	}

    43 

    44 /**

    45 *

    46 * Codec

    47 * @return 'CMMFSwCodec&'

    48 *

    49 */

    50 CMMFSwCodec& CMMFPcmU16ToPcm16HwDevice::Codec()

    51 	{

    52 	return *iCodec;

    53 	}

    54 

    55 /**

    56 *

    57 * ConstructL

    58 * 

    59 */

    60 void CMMFPcmU16ToPcm16HwDevice::ConstructL()

    61 	{

    62 	iCodec = new (ELeave) CMMFPcmU16ToPcm16Codec();

    63 	}

    64 

    65 /**

    66 *

    67 * ProcessL

    68 * @param aSrc

    69 * @param aDst

    70 * @return CMMFSwCodec::TCodecProcessResult

    71 * this codec has a does not expand or shrink destination data

    72 */

    73 CMMFSwCodec::TCodecProcessResult CMMFPcmU16ToPcm16Codec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

    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*, &aSrc);

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

    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/2;

    95 	iAudioU16ToS16Pcm.Convert(pSrc, pDst, noSamples);

    96 	

    97 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

    98 	result.iSrcBytesProcessed  = srcUse;

    99 	result.iDstBytesAdded      = srcUse;

   100 	dst->Data().SetLength(srcUse);

   101 	

   102 	//[ post conditions

   103     // srcbytes/2 == destbytes added

   104 	// pos src == 0

   105 	// pos dest == 0

   106 	// src data length is even

   107 	// dst data length is even ie pcm16 samples ]

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

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

   110 	__ASSERT_DEBUG( src->Data().Length() == dst->Data().Length(), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));

   111 	__ASSERT_DEBUG( dst->Data().Length() % 2 == 0, TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));

   112 	__ASSERT_DEBUG( src->Data().Length() % 2 == 0, TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));

   113 	

   114 	return result;

   115 	}

   116 

   117 /**

   118 *

   119 * Preconditions

   120 * This methos tests the preconditions of the ProcessL method

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

   122 *

   123 **/

   124 TBool CMMFPcmU16ToPcm16Codec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )

   125 	{

   126 	TBool result = EFalse;

   127 	

   128 	if(! aSrcBuffer )

   129 		{

   130 		return result;

   131 		}

   132 	

   133 	if( ! aDestBuffer )

   134 		{

   135 		return result;

   136 		}

   137 	

   138 	// Check position of src and dest are 0

   139 	if( aSrcBuffer->Position() )

   140 		{

   141 		return result;

   142 		}

   143 	

   144 	// Check position of src and dest are 0

   145 	if( aDestBuffer->Position() )

   146 		{

   147 		return result;

   148 		}

   149 	

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

   151 	if( ( aSrcBuffer->Data().Length() > aDestBuffer->Data().MaxLength() ) ||

   152 		( aSrcBuffer->Data().Length() % 2 != 0 ) ) // must have pcm16 samples on input

   153 		{

   154 		return result;

   155 		}

   156 	

   157 	result = ETrue;  // preconditions have been satisfied

   158 	

   159 	return result;

   160 	}