1 // Copyright (c) 2005-2009 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 "MmfBtPcmU16BeToPcmS16HwDevice.h"

    17 #include "../../MmfBtFileDependencyUtil.h"

    18 

    19 /**

    20  *

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

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

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

    24  *	@return	"CMMFPcm16ToPcmU16BEHwDevice"

    25  *

    26  */

    27 CMMFPcmU16BeToPcmS16HwDevice* CMMFPcmU16BeToPcmS16HwDevice::NewL()

    28 	{

    29     CMMFPcmU16BeToPcmS16HwDevice* self = new (ELeave) CMMFPcmU16BeToPcmS16HwDevice();

    30 	CleanupStack::PushL(self);

    31 	self->ConstructL();

    32 	CleanupStack::Pop(self);

    33 	return self;

    34 	}

    35 

    36 /**

    37 *

    38 * ~CMMFPcmU16BeToPcmS16HwDevice

    39 *

    40 */

    41 CMMFPcmU16BeToPcmS16HwDevice::~CMMFPcmU16BeToPcmS16HwDevice()

    42 	{

    43 	}

    44 

    45 /**

    46 *

    47 * Codec

    48 * @return 'CMMFSwCodec&'

    49 *

    50 */

    51 CMMFSwCodec& CMMFPcmU16BeToPcmS16HwDevice::Codec()

    52 	{

    53 	return *iCodec;

    54 	}

    55 

    56 /**

    57 *

    58 * ConstructL

    59 *

    60 */

    61 void CMMFPcmU16BeToPcmS16HwDevice::ConstructL()

    62 	{

    63 	iCodec = new (ELeave) CMMFPcmU16BeToPcmS16Codec();

    64 	}

    65 

    66 /**

    67 *

    68 * ProcessL

    69 * @param aSrc

    70 * @param aDst

    71 * @return CMMFSwCodec::TCodecProcessResult

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

    73 */

    74 CMMFSwCodec::TCodecProcessResult CMMFPcmU16BeToPcmS16Codec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

    75 	{

    76 	TCodecProcessResult result;

    77 	result.iCodecProcessStatus = result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

    78 	

    79 	//convert from generic CMMFBuffer to CMMFDataBuffer

    80 	const CMMFDataBuffer* src = STATIC_CAST(const CMMFDataBuffer*, &aSrc);

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

    82 	

    83 	//[ check preconditions ]

    84 	if( !CheckPreconditions( src, dst ))

    85 		{

    86 		//[ precondition violation ]

    87 		User::Leave( KErrArgument );

    88 		}

    89 	

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

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

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

    93 	

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

    95 	TInt noSamples = srcUse/2;

    96 	iAudioPcmU16BeToPcmS16.Convert(pSrc, pDst, noSamples);

    97 	

    98 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

    99 	result.iSrcBytesProcessed = srcUse;

   100 	result.iDstBytesAdded     = srcUse;

   101 	

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

   103 	

   104 	//[ post conditions

   105     // srcbytes/2 == destbytes added

   106 	// pos src == 0

   107 	// pos dest == 0

   108 	// src data length is even

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

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

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

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

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

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

   115 	

   116 	return result;

   117 	}

   118 

   119 /**

   120 *

   121 * Preconditions

   122 * This methos tests the preconditions of the ProcessL method

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

   124 *

   125 **/

   126 TBool CMMFPcmU16BeToPcmS16Codec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )

   127 	{

   128 	TBool result = EFalse;

   129 	

   130 	if(! aSrcBuffer )

   131 		{

   132 		return result;

   133 		}

   134 	

   135 	if( ! aDestBuffer )

   136 		{

   137 		return result;

   138 		}

   139 	

   140 	// Check position of src and dest are 0

   141 	if( aSrcBuffer->Position() )

   142 		{

   143 		return result;

   144 		}

   145 	

   146 	// Check position of src and dest are 0

   147 	if( aDestBuffer->Position() )

   148 		{

   149 		return result;

   150 		}

   151 	

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

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

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

   155 		{

   156 		return result;

   157 		}

   158 	

   159 	result = ETrue;  // preconditions have been satisfied

   160 	

   161 	return result;

   162 	}