Symaptic: os/mm/devsound/sounddevbt/src/Plugin/HwDevice/Audio/MmfBtPcmS8ToPcmS16HwDevice.cpp@bde4ae8d615e

     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 //

    17 #include "MmfBtPcmS8ToPcmS16HwDevice.h"

    18 #include "../../MmfBtFileDependencyUtil.h"

    20 /**

    21  *

    22  *	Returns the created hw device for passing audio through audio.

    23  *  for the wins implementation this would always be pcm16 although

    24  *  this is effectively a null hw device that will pass any datatype through

    25  *	@return	"CMMFPcm16ToPcmU16BEHwDevice"

    26  *

    27  */

    28 CMMFPcm8ToPcm16HwDevice* CMMFPcm8ToPcm16HwDevice::NewL()

    29 	{

    30     CMMFPcm8ToPcm16HwDevice* self = new (ELeave) CMMFPcm8ToPcm16HwDevice();

    31 	CleanupStack::PushL(self);

    32 	self->ConstructL();

    33 	CleanupStack::Pop(self);

    34 	return self;

    35 	}

    37 /**

    38 *

    39 * ~CMMFPcm8ToPcm16HwDevice

    40 */

    41 CMMFPcm8ToPcm16HwDevice::~CMMFPcm8ToPcm16HwDevice()

    42 	{

    43 	}

    45 /**

    46 *

    47 * ConstructL

    48 *

    49 */

    50 void CMMFPcm8ToPcm16HwDevice::ConstructL()

    51 	{

    52 	iCodec = new (ELeave) CMMFPcm8ToPcm16Codec();

    53 	}

    55 /**

    56 *

    57 * Codec

    58 * @return 'CMMFSwCodec&'

    59 *

    60 */

    61 CMMFSwCodec& CMMFPcm8ToPcm16HwDevice::Codec()

    62 	{

    63 	return *iCodec;

    64 	}

    66 /**

    67 *

    68 * ProcessL

    69 * @param aSrc

    70 * @param aDst

    71 * @return 'CMMFSwCodec::TCodecProcessResult'

    72 * this codec expands 1 byte to 2 bytes

    73 */

    74 CMMFSwCodec::TCodecProcessResult CMMFPcm8ToPcm16Codec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

    75 	{

    76 	TCodecProcessResult result;

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

    79 	//convert from generic CMMFBuffer to CMMFDataBuffer

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

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

    83 	//[ check preconditions ]

    84 	if( !CheckPreconditions( src, dst ))

    85 		{

    86 		//[ precondition violation ]

    87 		User::Leave( KErrArgument );

    88 		}

    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());

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

    95 	iAudioPcm8ToPcm16.Convert(pSrc, pDst, noSamples );

    97 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

    99 	TInt dstBytesAdded         = noSamples *sizeof(TInt16);

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

   101 	result.iDstBytesAdded     = dstBytesAdded;

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

   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

   110 	return result;

   111 	}

   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 CMMFPcm8ToPcm16Codec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )

   121 	{

   122      TBool result = EFalse;

   124 	 if(! aSrcBuffer )

   125 		 {

   126 		 return result;

   127 		 }

   129 	 if( ! aDestBuffer )

   130 		 {

   131 		 return result;

   132 		 }

   134 	 // Check position of src and dest are 0

   135 	 if( aSrcBuffer->Position() )

   136 		 {

   137 		 return result;

   138 		 }

   140 	  // Check position of src and dest are 0

   141 	 if( aDestBuffer->Position() )

   142 		 {

   143 		 return result;

   144 		 }

   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 		 }

   152 	 result = ETrue;  // preconditions have been satisfied

   154 	 return result;

   155 	}

author	sl@SLION-WIN7.fritz.box
	Fri, 15 Jun 2012 03:10:57 +0200
changeset 0	bde4ae8d615e
permissions	-rw-r--r--