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os/mm/devsound/sounddevbt/src/Plugin/HwDevice/Audio/MmfBtMuLawToPcm16HwDevice.cpp
author sl
Tue, 10 Jun 2014 14:32:02 +0200
changeset 1 260cb5ec6c19
permissions -rw-r--r--
Update contrib. 
     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 "MmfBtAudioCodec.h"

    17 #include <mmfpaniccodes.h>

    18 #include "MmfBtMuLawToPcm16HwDevice.h"

    19 #include "../../MmfBtFileDependencyUtil.h"

    20 

    21 /**

    22 *

    23 * NewL

    24 *

    25 */

    26 CMMFMulawToPcm16CodecHwDevice* CMMFMulawToPcm16CodecHwDevice::NewL()

    27 	{

    28 	CMMFMulawToPcm16CodecHwDevice* self=new(ELeave) CMMFMulawToPcm16CodecHwDevice();

    29 	CleanupStack::PushL(self);

    30 	self->ConstructL();

    31 	CleanupStack::Pop(self);

    32 	return self;

    33 	}

    34 

    35 /**

    36 *

    37 * ~CMMFMulawPcm16HwDevice

    38 *

    39 */

    40 CMMFMulawToPcm16CodecHwDevice::~CMMFMulawToPcm16CodecHwDevice()

    41 	{

    42 	}

    43 

    44 /**

    45 *

    46 * ConstructL

    47 *

    48 */

    49 void CMMFMulawToPcm16CodecHwDevice::ConstructL()

    50 	{

    51 	iCodec = new (ELeave) CMMFMulawToPcm16Codec();

    52 	}

    53 

    54 /**

    55 *

    56 * Codec

    57 *

    58 */

    59 CMMFSwCodec &CMMFMulawToPcm16CodecHwDevice::Codec()

    60 	{

    61 	return *iCodec;

    62 	}

    63 

    64 /**

    65 *

    66 * ProcessL

    67 * @param aSrc

    68 * @param aDst

    69 * @return TCodecProcessResult

    70 *

    71 */

    72 CMMFSwCodec::TCodecProcessResult CMMFMulawToPcm16Codec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

    73 	{

    74 	CMMFSwCodec::TCodecProcessResult result;

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

    76 	

    77 	//convert from generic CMMFBuffer to CMMFDataBuffer

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

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

    80 	

    81 	//[check preconditions hold ]

    82 	if( !CheckPreconditions( src, dst ))

    83 		{

    84 		//[ precondition violation ]

    85 		User::Leave( KErrArgument );

    86 		}

    87 	

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

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

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

    91 	TInt noSamples = src->Data().Length();

    92 	

    93 	iMulawTo16Pcm.Convert(pSrc, pDst, noSamples );

    94 	

    95 	TUint dstBytesAdded = noSamples*sizeof(TInt16);

    96 	

    97 	result.iCodecProcessStatus  = TCodecProcessResult::EProcessComplete;

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

    99 	result.iDstBytesAdded       = dstBytesAdded;

   100 	

   101 	dst->Data().SetLength( dstBytesAdded );

   102 	

   103 	//[ check post conditions ]

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

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

   106 	__ASSERT_DEBUG( src->Data().Length() == dst->Data().Length()/2, TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); // 2 here signifies sizeof TInt16

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

   108 	

   109 	return result;

   110 	}

   111 

   112 /**

   113 *

   114 * Preconditions

   115 * This methos tests the preconditions of the ProcessL method

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

   117 *

   118 **/

   119 TBool CMMFMulawToPcm16Codec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )

   120 	{

   121 	TBool result = EFalse;

   122 	

   123 	if(! aSrcBuffer )

   124 		{

   125 		return result;

   126 		}

   127 	

   128 	if( ! aDestBuffer )

   129 		{

   130 		return result;

   131 		}

   132 	

   133 	// Check position of src and dest are 0

   134 	if( aSrcBuffer->Position() )

   135 		{

   136 		return result;

   137 		}

   138 	

   139 	// Check position of src and dest are 0

   140 	if( aDestBuffer->Position() )

   141 		{

   142 		return result;

   143 		}

   144 	

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

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

   147 		{

   148 		return result;

   149 		}

   150 	

   151 	result = ETrue;  // preconditions have been satisfied

   152 	

   153 	return result;

   154 	}
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