os/mm/devsound/sounddevbt/src/Plugin/HwDevice/Audio/MmfBtPcm16ToPcmU16BEHwDevice.cpp
1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/mm/devsound/sounddevbt/src/Plugin/HwDevice/Audio/MmfBtPcm16ToPcmU16BEHwDevice.cpp Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,159 @@
1.4 +// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
1.5 +// All rights reserved.
1.6 +// This component and the accompanying materials are made available
1.7 +// under the terms of "Eclipse Public License v1.0"
1.8 +// which accompanies this distribution, and is available
1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
1.10 +//
1.11 +// Initial Contributors:
1.12 +// Nokia Corporation - initial contribution.
1.13 +//
1.14 +// Contributors:
1.15 +//
1.16 +// Description:
1.17 +//
1.18 +
1.19 +#include "MmfBtPcm16ToPcmU16BEHwDevice.h"
1.20 +#include "../../MmfBtFileDependencyUtil.h"
1.21 +
1.22 +/**
1.23 + *
1.24 + * Returns the created hw device for passing audio through audio.
1.25 + * for the wins implementation this would always be pcm16 although
1.26 + * this is effectively a null hw device that will pass any datatype through
1.27 + * @return "CMMFPcm16ToPcmU16BEHwDevice"
1.28 + *
1.29 + */
1.30 +CMMFPcm16ToPcmU16BEHwDevice* CMMFPcm16ToPcmU16BEHwDevice::NewL()
1.31 + {
1.32 + CMMFPcm16ToPcmU16BEHwDevice* self = new (ELeave) CMMFPcm16ToPcmU16BEHwDevice();
1.33 + CleanupStack::PushL(self);
1.34 + self->ConstructL();
1.35 + CleanupStack::Pop(self);
1.36 + return self;
1.37 + }
1.38 +
1.39 +/**
1.40 +*
1.41 +* ~CMMFPcm16ToPcmU16BEHwDevice
1.42 +*/
1.43 +CMMFPcm16ToPcmU16BEHwDevice::~CMMFPcm16ToPcmU16BEHwDevice()
1.44 + {
1.45 + }
1.46 +
1.47 +/**
1.48 +*
1.49 +* ConstructL
1.50 +*
1.51 +*/
1.52 +void CMMFPcm16ToPcmU16BEHwDevice::ConstructL()
1.53 + {
1.54 + iCodec = new (ELeave) CMMFPcm16ToPcmU16BECodec();
1.55 + }
1.56 +
1.57 +/**
1.58 +*
1.59 +* Codec
1.60 +* @return 'CMMFSwCodec&'
1.61 +*/
1.62 +CMMFSwCodec& CMMFPcm16ToPcmU16BEHwDevice::Codec()
1.63 + {
1.64 + return *iCodec;
1.65 + }
1.66 +
1.67 +/**
1.68 +*
1.69 +* ProcessL
1.70 +* @param aSrc
1.71 +* @param aDst
1.72 +* @pre position of buffer aSrc is 0
1.73 +* @pre position of buffer aDst is 0
1.74 +* @pre sufficient bytes in output to consume input
1.75 +* @return 'CMMFSwCodec::TCodecProcessResult'
1.76 +* this codec has a does not expand or shrink destination data
1.77 +*/
1.78 +CMMFSwCodec::TCodecProcessResult CMMFPcm16ToPcmU16BECodec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)
1.79 + {
1.80 + TCodecProcessResult result;
1.81 + result.iCodecProcessStatus = result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;
1.82 +
1.83 + //convert from generic CMMFBuffer to CMMFDataBuffer
1.84 + const CMMFDataBuffer* src = STATIC_CAST(const CMMFDataBuffer*, &aSrc);
1.85 + CMMFDataBuffer* dst = STATIC_CAST(CMMFDataBuffer*, &aDst);
1.86 +
1.87 + //[ Check preconsitions ]
1.88 + if( !CheckPreconditions( src, dst ))
1.89 + {
1.90 + //[ precondition violation ]
1.91 + User::Leave( KErrArgument );
1.92 + }
1.93 +
1.94 + //we need to cast away CONST even on the source, as the TClass needs a TUint8*
1.95 + TUint8* pSrc = CONST_CAST(TUint8*,src->Data().Ptr());
1.96 + TUint8* pDst = CONST_CAST(TUint8*,dst->Data().Ptr());
1.97 +
1.98 + TInt srcUse = src->Data().Length();
1.99 +
1.100 + TInt noSamples = srcUse/2; // for pcm16 TInt16
1.101 + iAudioPcm16ToPcmU16Be.Convert(pSrc, pDst, noSamples );
1.102 +
1.103 + result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;
1.104 + result.iSrcBytesProcessed = srcUse;
1.105 + result.iDstBytesAdded = srcUse;
1.106 +
1.107 + dst->Data().SetLength(srcUse);
1.108 +
1.109 + //[ Check post conditions ]
1.110 + __ASSERT_DEBUG( (src->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
1.111 + __ASSERT_DEBUG( (dst->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
1.112 + __ASSERT_DEBUG( src->Data().Length() == dst->Data().Length(), TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
1.113 + __ASSERT_DEBUG( dst->Data().Length() % 2 == 0, TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); // pcm output
1.114 +
1.115 + return result;
1.116 + }
1.117 +
1.118 +/**
1.119 +*
1.120 +* Preconditions
1.121 +* This methos tests the preconditions of the ProcessL method
1.122 +* @return TBool ETrue for sucess and EFalse for failure of the preconditions
1.123 +*
1.124 +**/
1.125 +TBool CMMFPcm16ToPcmU16BECodec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )
1.126 + {
1.127 + TBool result = EFalse;
1.128 +
1.129 + if(! aSrcBuffer )
1.130 + {
1.131 + return result;
1.132 + }
1.133 +
1.134 + if( ! aDestBuffer )
1.135 + {
1.136 + return result;
1.137 + }
1.138 +
1.139 + // Check position of src and dest are 0
1.140 + if( aSrcBuffer->Position() )
1.141 + {
1.142 + return result;
1.143 + }
1.144 +
1.145 + // Check position of src and dest are 0
1.146 + if( aDestBuffer->Position() )
1.147 + {
1.148 + return result;
1.149 + }
1.150 +
1.151 + // check there are sufficient bytes in the output to consume the input
1.152 + if( ( aSrcBuffer->Data().Length() > aDestBuffer->Data().MaxLength() ) ||
1.153 + ( aSrcBuffer->Data().Length() % 2 != 0 ) ) // must have pcm16 samples on input
1.154 + {
1.155 + return result;
1.156 + }
1.157 +
1.158 + result = ETrue; // preconditions have been satisfied
1.159 +
1.160 + return result;
1.161 + }
1.162 +