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os/mm/devsound/sounddevbt/src/Plugin/HwDevice/Audio/MmfBtPcm16SwapEndianHwDevice.cpp
author sl@SLION-WIN7.fritz.box
Fri, 15 Jun 2012 03:10:57 +0200
changeset 0 bde4ae8d615e
permissions -rw-r--r--
First public contribution. 
     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 // MmfBtMulawToPcm16HwDevice.cpp

    15 // 

    16 //

    17 

    18 #include "MmfBtAudioCodec.h"

    19 #include <mmfpaniccodes.h>

    20 #include "MmfBtPcm16SwapEndianHwDevice.h"

    21 #include "../../MmfBtFileDependencyUtil.h"

    22 

    23 /**

    24 *

    25 * NewL

    26 * @return 'CMMFPcm16SwapEndianHwDevice*'

    27 *

    28 */

    29 CMMFPcm16SwapEndianHwDevice* CMMFPcm16SwapEndianHwDevice::NewL()

    30 	{

    31 	CMMFPcm16SwapEndianHwDevice* self=new(ELeave) CMMFPcm16SwapEndianHwDevice();

    32 	CleanupStack::PushL(self);

    33 	self->ConstructL();

    34 	CleanupStack::Pop(self);

    35 	return self;

    36 	}

    37 

    38 /**

    39 *

    40 * ~CMMFPcm16SwapEndianHwDevice

    41 */

    42 CMMFPcm16SwapEndianHwDevice::~CMMFPcm16SwapEndianHwDevice()

    43 	{

    44 	}

    45 

    46 /**

    47 *

    48 * ConstructL

    49 *

    50 */

    51 void CMMFPcm16SwapEndianHwDevice::ConstructL()

    52 	{

    53 	iCodec = new (ELeave)CMMFPcm16SwapEndianCodec();

    54 	}

    55 

    56 /**

    57 *

    58 * Codec

    59 *

    60 */

    61 CMMFSwCodec &CMMFPcm16SwapEndianHwDevice::Codec()

    62 	{

    63 	return *iCodec;

    64 	}

    65 

    66 /**

    67 *

    68 * ProcessL

    69 * @param aSrc

    70 * @param aDst

    71 * @return 'CMMFSwCodec::TCodecProcessResult'

    72 *

    73 */

    74 CMMFSwCodec::TCodecProcessResult CMMFPcm16SwapEndianCodec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

    75 	{

    76 	CMMFSwCodec::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 the preconditions ]

    84 	if( !CheckPreconditions( src, dst ))

    85 		{

    86 		//[ precondition violation ]

    87 		User::Leave( KErrArgument );

    88 		}

    89 	

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

    91 	

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

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

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

    95 	

    96 	TInt noSamples = srcUse / 2; 	//divide by TWO as 2 bytes are equal to 1 sample

    97 	iPcm16EndianSwap.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 CMMFPcm16SwapEndianCodec::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 ))

   150 		{

   151 		return result;

   152 		}

   153 	

   154 	result = ETrue;  // preconditions have been satisfied

   155 	

   156 	return result;

   157 	}
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