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 //

    15 

    16 #include "MMFAudioCodec.h"

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

    18 #include "MmfALawToPcm16HwDevice.h"

    19 

    20 

    21 /**

    22 *

    23 * NewL

    24 *

    25 */

    26 CMMFAlawToPcm16CodecHwDevice* CMMFAlawToPcm16CodecHwDevice::NewL()

    27 	{

    28 	CMMFAlawToPcm16CodecHwDevice* self=new(ELeave) CMMFAlawToPcm16CodecHwDevice();

    29 	CleanupStack::PushL(self);

    30 	self->ConstructL();

    31 	CleanupStack::Pop(self);

    32 	return self;

    33 	}

    34 

    35 /**

    36 *

    37 * ~CMMFAlawPcm16HwDevice

    38 *

    39 */

    40 CMMFAlawToPcm16CodecHwDevice::~CMMFAlawToPcm16CodecHwDevice()

    41 	{

    42 	}

    43 

    44 /**

    45 *

    46 * ConstructL

    47 *

    48 */

    49 void CMMFAlawToPcm16CodecHwDevice::ConstructL()

    50 	{

    51 	iCodec = new (ELeave) CMMFAlawToPcm16Codec();

    52 	}

    53 

    54 /**

    55 *

    56 * Codec

    57 *

    58 */

    59 CMMFSwCodec &CMMFAlawToPcm16CodecHwDevice::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 TCodecProcessResult

    73 *

    74 */

    75 CMMFSwCodec::TCodecProcessResult CMMFAlawToPcm16Codec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

    76 	{

    77 	CMMFSwCodec::TCodecProcessResult result;

    78 	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 	if( !CheckPreconditions( src, dst ))

    85 		{

    86 		//[ precondition violation ]

    87 		User::Leave( KErrArgument );

    88 		}

    89 		

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

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

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

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

    94 	iAlawTo16Pcm.Convert(pSrc, pDst, noSamples );

    95 	

    96 	TUint dstBytesAdded = noSamples*sizeof(TInt16);

    97 	

    98 	result.iCodecProcessStatus  = TCodecProcessResult::EProcessComplete;	

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

   100 	result.iDstBytesAdded       = dstBytesAdded;

   101 	

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

   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()/2, TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); // 2 here signifies sizeof TInt16

   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 CMMFAlawToPcm16Codec::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 		 {

   149 		 return result;

   150 		 }

   151 

   152 	 result = ETrue;  // preconditions have been satisfied

   153 

   154 	 return result;

   155 	}