Symaptic: os/mm/devsound/sounddevbt/src/Plugin/HwDevice/Audio/MmfBtPcmS16ToPcmU16Codec.cpp@260cb5ec6c19

     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 //

    16 #include "MmfBtPcmS16ToPcmU16Codec.h"

    17 #include "../../MmfBtFileDependencyUtil.h"

    19 /**

    20  *

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

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

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

    24  *	@return	"CMMFPcm16ToPcmU16BEHwDevice"

    25  *

    26  */

    27 CMMFPcm16ToPcmU16HwDevice* CMMFPcm16ToPcmU16HwDevice::NewL()

    28 	{

    29     CMMFPcm16ToPcmU16HwDevice* self = new (ELeave) CMMFPcm16ToPcmU16HwDevice();

    30 	CleanupStack::PushL(self);

    31 	self->ConstructL();

    32 	CleanupStack::Pop(self);

    33 	return self;

    34 	}

    36 /**

    37 *

    38 * ~CMMFPcm16ToPcmU16HwDevice

    39 *

    40 */

    41 CMMFPcm16ToPcmU16HwDevice::~CMMFPcm16ToPcmU16HwDevice()

    42 	{

    43 	}

    45 /**

    46 *

    47 * ConstructL

    48 *

    49 */

    50 void CMMFPcm16ToPcmU16HwDevice::ConstructL()

    51 	{

    52 	iCodec = new (ELeave) CMMFPcm16ToPcmU16CodecCodec();

    53 	}

    55 /**

    56 *

    57 * Codec

    58 * @return 'CMMFSwCodec&'

    59 *

    60 */

    61 CMMFSwCodec& CMMFPcm16ToPcmU16HwDevice::Codec()

    62 	{

    63 	return *iCodec;

    64 	}

    66 /**

    67 *

    68 * ProcessL

    69 * @param aSrc

    70 * @param aDst

    71 * @return 'CMMFSwCodec::TCodecProcessResult'

    72 * this codec has a does not expand or shrink destination data

    73 */

    74 CMMFSwCodec::TCodecProcessResult CMMFPcm16ToPcmU16CodecCodec::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 srcUse = src->Data().Length();

    96 	TInt noSamples = srcUse/2;

    97 	iAudioPcm16ToPcmU16.Convert(pSrc, pDst, noSamples);

    99 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

   100 	result.iSrcBytesProcessed  = srcUse;

   101 	result.iDstBytesAdded      = srcUse;

   103 	dst->Data().SetLength(srcUse);

   105 	//[ post conditions

   106     // srcbytes/2 == destbytes added

   107 	// pos src == 0

   108 	// pos dest == 0

   109 	// src data length is even

   110 	// dst data length is even ie pcm16 samples ]

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

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

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

   114 	__ASSERT_DEBUG( dst->Data().Length() % 2 == 0, TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));

   115 	__ASSERT_DEBUG( src->Data().Length() % 2 == 0, TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));

   117 	return result;

   118 	}

   120 /**

   121 *

   122 * Preconditions

   123 * This methos tests the preconditions of the ProcessL method

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

   125 *

   126 **/

   127 TBool CMMFPcm16ToPcmU16CodecCodec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )

   128 	{

   129 	TBool result = EFalse;

   131 	if(! aSrcBuffer )

   132 		{

   133 		return result;

   134 		}

   136 	if( ! aDestBuffer )

   137 		{

   138 		return result;

   139 		}

   141 	// Check position of src and dest are 0

   142 	if( aSrcBuffer->Position() )

   143 		{

   144 		return result;

   145 		}

   147 	// Check position of src and dest are 0

   148 	if( aDestBuffer->Position() )

   149 		{

   150 		return result;

   151 		}

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

   154 	if( ( aSrcBuffer->Data().Length() > aDestBuffer->Data().MaxLength() ) ||

   155 		( aSrcBuffer->Data().Length() % 2 != 0 ) ) // must have pcm16 samples on input

   156 		{

   157 		return result;

   158 		}

   160 	result = ETrue;  // preconditions have been satisfied

   162 	return result;

   163 	}

author	sl
	Tue, 10 Jun 2014 14:32:02 +0200
changeset 1	260cb5ec6c19
permissions	-rw-r--r--