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 "mmfpcmS16topcmU16Codec.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 CMMFPcm16ToPcmU16HwDevice* CMMFPcm16ToPcmU16HwDevice::NewL()

    27 	{

    28     CMMFPcm16ToPcmU16HwDevice* self = new (ELeave) CMMFPcm16ToPcmU16HwDevice();

    29 	CleanupStack::PushL(self);

    30 	self->ConstructL();

    31 	CleanupStack::Pop(self);

    32 	return self;

    33 	}

    34 

    35 /**

    36 *

    37 * ~CMMFPcm16ToPcmU16HwDevice

    38 *

    39 */

    40 CMMFPcm16ToPcmU16HwDevice::~CMMFPcm16ToPcmU16HwDevice()

    41 	{

    42 	}

    43 

    44 /**

    45 *

    46 * ConstructL

    47 *

    48 */

    49 void CMMFPcm16ToPcmU16HwDevice::ConstructL()

    50 	{

    51 	iCodec = new (ELeave) CMMFPcm16ToPcmU16CodecCodec();

    52 	}

    53 

    54 /**

    55 *

    56 * Codec

    57 * @return 'CMMFSwCodec&'

    58 *

    59 */

    60 CMMFSwCodec& CMMFPcm16ToPcmU16HwDevice::Codec()

    61 	{

    62 	return *iCodec;

    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 CMMFPcm16ToPcmU16CodecCodec::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 	

    95 	TInt noSamples = srcUse/2;

    96 	iAudioPcm16ToPcmU16.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 CMMFPcm16ToPcmU16CodecCodec::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 	}