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 "MmfBtPcm16ToMulawHwDevice.h"

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

    18 

    19 /**

    20 *

    21 * NewL

    22 *

    23 */

    24 CMMFPcm16ToMulawHwDevice* CMMFPcm16ToMulawHwDevice::NewL()

    25 	{

    26 	CMMFPcm16ToMulawHwDevice* self=new(ELeave) CMMFPcm16ToMulawHwDevice();

    27 	CleanupStack::PushL(self);

    28 	self->ConstructL();

    29 	CleanupStack::Pop(self);

    30 	return self;

    31 	}

    32 

    33 /**

    34 *

    35 * ~CMMFPcm16ToMulawHwDevice

    36 *

    37 */

    38 CMMFPcm16ToMulawHwDevice::~CMMFPcm16ToMulawHwDevice()

    39 	{

    40 	}

    41 

    42 /**

    43 *

    44 * ConstructL

    45 *

    46 */

    47 void CMMFPcm16ToMulawHwDevice::ConstructL()

    48 	{

    49 	iCodec = new (ELeave) CMMFPcm16ToMuLawCodec();

    50 	}

    51 

    52 /**

    53 *

    54 * Codec

    55 *

    56 */

    57 CMMFSwCodec &CMMFPcm16ToMulawHwDevice::Codec()

    58 	{

    59 	return *iCodec;

    60 	}

    61 

    62 /**

    63 *

    64 * ProcessL

    65 * @param aSrc

    66 * @param aDst

    67 * @pre position of buffer aSrc is 0

    68 * @pre position of buffer aDst is 0

    69 * @pre sufficient bytes in output to consume input

    70 * @return TCodecProcessResult

    71 *

    72 */

    73 CMMFSwCodec::TCodecProcessResult CMMFPcm16ToMuLawCodec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

    74 	{

    75 	CMMFSwCodec::TCodecProcessResult result;

    76 	result.iCodecProcessStatus = 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 	if( !CheckPreconditions( src, dst ) )

    83 		{

    84 		//[ precondition(s) violation ]

    85 		User::Leave(KErrArgument);

    86 		}

    87 	

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

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

    90 	

    91 	TUint destUse = src->Data().Length()/2;

    92 	

    93 	//compress TWO bytes (16-bit PCM word) into a to 1 byte sample

    94 	iPcm16ToMuLaw.Convert(pSrc, pDst, destUse );

    95 	

    96 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

    97 	result.iSrcBytesProcessed  = src->Data().Length();

    98 	result.iDstBytesAdded      = destUse;

    99 	

   100 	dst->Data().SetLength(result.iDstBytesAdded);

   101 	

   102 	//[ post conditions

   103     // srcbytes/2 == destbytes added

   104 	// pos src == 0

   105 	// pos dest == 0 ]

   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()/2 == dst->Data().Length(), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));

   109 	

   110 	return result;

   111 	}

   112 

   113 /**

   114 *

   115 * Preconditions

   116 * This method tests the preconditions of the ProcessL method

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

   118 *

   119 **/

   120 TBool CMMFPcm16ToMuLawCodec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )

   121 	{

   122 	TBool result = EFalse;

   123 	

   124 	if(! aSrcBuffer )

   125 		{

   126 		return result;

   127 		}

   128 	

   129 	if( ! aDestBuffer )

   130 		{

   131 		return result;

   132 		}

   133 	

   134 	// Check position of src and dest are 0

   135 	if( aSrcBuffer->Position() )

   136 		{

   137 		return result;

   138 		}

   139 	

   140 	// Check position of src and dest are 0

   141 	if( aDestBuffer->Position() )

   142 		{

   143 		return result;

   144 		}

   145 	

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

   147 	if( ( aSrcBuffer->Data().Length()/2 > aDestBuffer->Data().MaxLength()) ||

   148 		( aSrcBuffer->Data().Length() % 2 != 0 ))

   149 		{

   150 		return result;

   151 		}

   152 	

   153 	result = ETrue;  // preconditions have been satisfied

   154 	

   155 	return result;

   156 	}