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os/mm/devsound/devsoundrefplugin/src/plugin/audio/mmfpcm16SwapEndianhwdevice.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) 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 // MmfMulawToPcm16HwDevice.cpp

    15 // 

    16 //

    17 

    18 #include "MMFAudioCodec.h"

    19 #include <mmf/common/mmfpaniccodes.h>

    20 #include "mmfpcm16SwapEndianhwdevice.h"

    21 

    22 /**

    23 *

    24 * NewL

    25 * @return 'CMMFPcm16SwapEndianHwDevice*'

    26 *

    27 */

    28 CMMFPcm16SwapEndianHwDevice* CMMFPcm16SwapEndianHwDevice::NewL()

    29 	{

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

    31 	CleanupStack::PushL(self);

    32 	self->ConstructL();

    33 	CleanupStack::Pop(self);

    34 	return self;

    35 	}

    36 

    37 /**

    38 *

    39 * ~CMMFPcm16SwapEndianHwDevice

    40 */

    41 CMMFPcm16SwapEndianHwDevice::~CMMFPcm16SwapEndianHwDevice()

    42 	{

    43 	}

    44 

    45 /**

    46 *

    47 * ConstructL

    48 *

    49 */

    50 void CMMFPcm16SwapEndianHwDevice::ConstructL()

    51 	{

    52 	iCodec = new (ELeave)CMMFPcm16SwapEndianCodec();

    53 	}

    54 

    55 /**

    56 *

    57 * Codec

    58 *

    59 */

    60 CMMFSwCodec &CMMFPcm16SwapEndianHwDevice::Codec()

    61 	{

    62 	return *iCodec;

    63 	}

    64 

    65 /**

    66 *

    67 * ProcessL

    68 * @param aSrc

    69 * @param aDst

    70 * @return 'CMMFSwCodec::TCodecProcessResult'

    71 *

    72 */

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

    74 	{

    75 	CMMFSwCodec::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 the preconditions ]

    83 	if( !CheckPreconditions( src, dst ))

    84 		{

    85 		//[ precondition violation ]

    86 		User::Leave( KErrArgument );

    87 		}

    88 	

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

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

    96 	iPcm16EndianSwap.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 	//[ check post conditions ]

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

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

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

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

   109 	

   110 	return result;

   111 	}

   112 

   113 /**

   114 *

   115 * Preconditions

   116 * This methos tests the preconditions of the ProcessL method

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

   118 *

   119 **/

   120 TBool CMMFPcm16SwapEndianCodec::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() > 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 	}
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