MercurialSymaptic / file revision
summary | shortlog | changelog | graph | tags | bookmarks | branches | files | changeset | file | latest | revisions | annotate | diff | raw | help
os/mm/devsound/sounddevbt/src/Plugin/HwDevice/Audio/MmfBtPcm16ToPcmU8HwDevice.cpp
author sl
Tue, 10 Jun 2014 14:32:02 +0200
changeset 1 260cb5ec6c19
permissions -rw-r--r--
Update contrib. 
     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 // MmfPcm16ToPcmU8HwDevice.cpp

    15 // 

    16 //

    17 

    18 #include "MmfBtPcm16ToPcmU8HwDevice.h"

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

    20 

    21 /**

    22  *

    23  *	Returns the created hw device for signed pcm16 to unsigned pcm8 audio.

    24  *

    25  *	@return	"CMMFPcm16ToPcmU8HwDevice"

    26  *

    27  */

    28 CMMFPcm16ToPcmU8HwDevice* CMMFPcm16ToPcmU8HwDevice::NewL()

    29 	{

    30     CMMFPcm16ToPcmU8HwDevice* self = new (ELeave) CMMFPcm16ToPcmU8HwDevice();

    31 	CleanupStack::PushL(self);

    32 	self->ConstructL();

    33 	CleanupStack::Pop(self);

    34 	return self;

    35 	}

    36 

    37 /**

    38  *

    39  *	Second phase constructor.

    40  *

    41  */

    42 void CMMFPcm16ToPcmU8HwDevice::ConstructL()

    43 	{

    44     iCodec = new (ELeave) CMMFPcm16ToPcmU8Codec();

    45 	}

    46 

    47 /**

    48 *

    49 * ~CMMFPcm16ToPcmU8HwDevice

    50 */

    51 CMMFPcm16ToPcmU8HwDevice::~CMMFPcm16ToPcmU8HwDevice()

    52 	{

    53 	//The codec is deleted in the base class CMMFSwCodecWrapper

    54 	}

    55 

    56 /**

    57 *

    58 * Codec

    59 * @return 'CMMFSwCodec&'

    60 *

    61 */

    62 CMMFSwCodec& CMMFPcm16ToPcmU8HwDevice::Codec()

    63 	{

    64 	return *iCodec;

    65 	}

    66 

    67 /**

    68 *

    69 * ProcessL

    70 * @param aSrc 

    71 * @param aDst

    72 * @return 'CMMFSwCodec::TCodecProcessResult'

    73 *

    74 */

    75 CMMFSwCodec::TCodecProcessResult CMMFPcm16ToPcmU8Codec::ProcessL(const CMMFBuffer& aSource, CMMFBuffer& aDest)

    76 	{

    77 	TCodecProcessResult result;

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

    79 	

    80 	//convert from generic CMMFBuffer to CMMFDataBuffer

    81 	const CMMFDataBuffer* src = STATIC_CAST(const CMMFDataBuffer*, &aSource);

    82 	CMMFDataBuffer* dst = STATIC_CAST(CMMFDataBuffer*, &aDest);

    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     

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

    95 	

    96 	TInt noSamples = srcUse /2;

    97 	iAudioS16ToU8Pcm.Convert(pSrc, pDst, noSamples );

    98 	

    99 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

   100 	result.iSrcBytesProcessed  = srcUse;

   101 	result.iDstBytesAdded      = srcUse / 2;

   102 	

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

   104 	

   105 	//[ post conditions

   106     // srcbytes/2 == destbytes added

   107 	// pos src == 0

   108 	// pos dest == 0 ]

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

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

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

   112 	

   113 	return result;

   114 	}

   115 

   116 /**

   117 *

   118 * Preconditions

   119 * This methos tests the preconditions of the ProcessL method

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

   121 *

   122 **/

   123 TBool CMMFPcm16ToPcmU8Codec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )

   124 	{

   125 	TBool result = EFalse;

   126 	

   127 	if(! aSrcBuffer )

   128 		{

   129 		return result;

   130 		}

   131 	

   132 	if( ! aDestBuffer )

   133 		{

   134 		return result;

   135 		}

   136 	

   137 	// Check position of src and dest are 0

   138 	if( aSrcBuffer->Position() )

   139 		{

   140 		return result;

   141 		}

   142 	

   143 	// Check position of src and dest are 0

   144 	if( aDestBuffer->Position() )

   145 		{

   146 		return result;

   147 		}

   148 	

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

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

   151 		{

   152 		return result;

   153 		}

   154 	

   155 	result = ETrue;  // preconditions have been satisfied

   156 	

   157 	return result;

   158 	}
Symaptic