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 "mmfpcm16topcmU16BEHwDevice.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 CMMFPcm16ToPcmU16BEHwDevice* CMMFPcm16ToPcmU16BEHwDevice::NewL()

    27 	{

    28     CMMFPcm16ToPcmU16BEHwDevice* self = new (ELeave) CMMFPcm16ToPcmU16BEHwDevice();

    29 	CleanupStack::PushL(self);

    30 	self->ConstructL();

    31 	CleanupStack::Pop(self);

    32 	return self;

    33 	}

    34 

    35 /**

    36 *

    37 * ~CMMFPcm16ToPcmU16BEHwDevice

    38 */

    39 CMMFPcm16ToPcmU16BEHwDevice::~CMMFPcm16ToPcmU16BEHwDevice()

    40 	{

    41 	}

    42 

    43 /**

    44 *

    45 * ConstructL

    46 *

    47 */

    48 void CMMFPcm16ToPcmU16BEHwDevice::ConstructL()

    49 	{

    50 	iCodec = new (ELeave) CMMFPcm16ToPcmU16BECodec();

    51 	}

    52 

    53 /**

    54 *

    55 * Codec

    56 * @return 'CMMFSwCodec&'

    57 */

    58 CMMFSwCodec& CMMFPcm16ToPcmU16BEHwDevice::Codec()

    59 	{

    60 	return *iCodec;

    61 	}

    62 

    63 /**

    64 *

    65 * ProcessL

    66 * @param aSrc 

    67 * @param aDst

    68 * @pre position of buffer aSrc is 0

    69 * @pre position of buffer aDst is 0

    70 * @pre sufficient bytes in output to consume input

    71 * @return 'CMMFSwCodec::TCodecProcessResult'

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

    73 */

    74 CMMFSwCodec::TCodecProcessResult CMMFPcm16ToPcmU16BECodec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

    75 	{

    76 	TCodecProcessResult result;

    77 	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 preconsitions ]

    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 	

    96 	TInt noSamples = srcUse/2; // for pcm16 TInt16

    97 	iAudioPcm16ToPcmU16Be.Convert(pSrc, pDst, noSamples );

    98 	

    99 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

   100 	result.iSrcBytesProcessed  = srcUse;

   101 	result.iDstBytesAdded      = srcUse;

   102 	

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

   104 	

   105 	//[ Check post conditions ]

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

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

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

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

   110 	

   111 	return result;

   112 	}

   113 

   114 /**

   115 *

   116 * Preconditions

   117 * This methos tests the preconditions of the ProcessL method

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

   119 *

   120 **/

   121 TBool CMMFPcm16ToPcmU16BECodec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )

   122 	{

   123      TBool result = EFalse;

   124 	 

   125 	 if(! aSrcBuffer )

   126 		 {

   127 		 return result;

   128 		 }

   129 	 

   130 	 if( ! aDestBuffer )

   131 		 {

   132 		 return result;

   133 		 }

   134 	 

   135 	 // Check position of src and dest are 0

   136 	 if( aSrcBuffer->Position() )

   137 		 {

   138 		 return result;

   139 		 }

   140 	 

   141 	 // Check position of src and dest are 0

   142 	 if( aDestBuffer->Position() )

   143 		 {

   144 		 return result;

   145 		 }

   146 	 

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

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

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

   150 		 {

   151 		 return result;

   152 		 }

   153 	 

   154 	 result = ETrue;  // preconditions have been satisfied

   155 	 

   156 	 return result;

   157 	}

   158