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 "MmfBtPcm16ToPcmU16BEHwDevice.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 CMMFPcm16ToPcmU16BEHwDevice* CMMFPcm16ToPcmU16BEHwDevice::NewL()

    28 	{

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

    30 	CleanupStack::PushL(self);

    31 	self->ConstructL();

    32 	CleanupStack::Pop(self);

    33 	return self;

    34 	}

    35 

    36 /**

    37 *

    38 * ~CMMFPcm16ToPcmU16BEHwDevice

    39 */

    40 CMMFPcm16ToPcmU16BEHwDevice::~CMMFPcm16ToPcmU16BEHwDevice()

    41 	{

    42 	}

    43 

    44 /**

    45 *

    46 * ConstructL

    47 *

    48 */

    49 void CMMFPcm16ToPcmU16BEHwDevice::ConstructL()

    50 	{

    51 	iCodec = new (ELeave) CMMFPcm16ToPcmU16BECodec();

    52 	}

    53 

    54 /**

    55 *

    56 * Codec

    57 * @return 'CMMFSwCodec&'

    58 */

    59 CMMFSwCodec& CMMFPcm16ToPcmU16BEHwDevice::Codec()

    60 	{

    61 	return *iCodec;

    62 	}

    63 

    64 /**

    65 *

    66 * ProcessL

    67 * @param aSrc 

    68 * @param aDst

    69 * @pre position of buffer aSrc is 0

    70 * @pre position of buffer aDst is 0

    71 * @pre sufficient bytes in output to consume input

    72 * @return 'CMMFSwCodec::TCodecProcessResult'

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

    74 */

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

    76 	{

    77 	TCodecProcessResult result;

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

    79 	

    80 	//convert from generic CMMFBuffer to CMMFDataBuffer

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

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

    83 	

    84 	//[ Check preconsitions ]

    85 	if( !CheckPreconditions( src, dst ))

    86 		{

    87 		//[ precondition violation ]

    88 		User::Leave( KErrArgument );

    89 		}

    90 	

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

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

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

    94     

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

    96 	

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

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

    99 	

   100 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

   101 	result.iSrcBytesProcessed  = srcUse;

   102 	result.iDstBytesAdded      = srcUse;

   103 	

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

   105 	

   106 	//[ Check post conditions ]

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

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

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

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

   111 	

   112 	return result;

   113 	}

   114 

   115 /**

   116 *

   117 * Preconditions

   118 * This methos tests the preconditions of the ProcessL method

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

   120 *

   121 **/

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

   123 	{

   124      TBool result = EFalse;

   125 	 

   126 	 if(! aSrcBuffer )

   127 		 {

   128 		 return result;

   129 		 }

   130 	 

   131 	 if( ! aDestBuffer )

   132 		 {

   133 		 return result;

   134 		 }

   135 	 

   136 	 // Check position of src and dest are 0

   137 	 if( aSrcBuffer->Position() )

   138 		 {

   139 		 return result;

   140 		 }

   141 	 

   142 	 // Check position of src and dest are 0

   143 	 if( aDestBuffer->Position() )

   144 		 {

   145 		 return result;

   146 		 }

   147 	 

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

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

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

   151 		 {

   152 		 return result;

   153 		 }

   154 	 

   155 	 result = ETrue;  // preconditions have been satisfied

   156 	 

   157 	 return result;

   158 	}

   159