1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/mm/devsound/sounddevbt/src/Plugin/HwDevice/Audio/MmfBtPcmS16ToPcmU16Codec.cpp Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,163 @@
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 "MmfBtPcmS16ToPcmU16Codec.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 +CMMFPcm16ToPcmU16HwDevice* CMMFPcm16ToPcmU16HwDevice::NewL()
1.31 + {
1.32 + CMMFPcm16ToPcmU16HwDevice* self = new (ELeave) CMMFPcm16ToPcmU16HwDevice();
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 +* ~CMMFPcm16ToPcmU16HwDevice
1.42 +*
1.43 +*/
1.44 +CMMFPcm16ToPcmU16HwDevice::~CMMFPcm16ToPcmU16HwDevice()
1.45 + {
1.46 + }
1.47 +
1.48 +/**
1.49 +*
1.50 +* ConstructL
1.51 +*
1.52 +*/
1.53 +void CMMFPcm16ToPcmU16HwDevice::ConstructL()
1.54 + {
1.55 + iCodec = new (ELeave) CMMFPcm16ToPcmU16CodecCodec();
1.56 + }
1.57 +
1.58 +/**
1.59 +*
1.60 +* Codec
1.61 +* @return 'CMMFSwCodec&'
1.62 +*
1.63 +*/
1.64 +CMMFSwCodec& CMMFPcm16ToPcmU16HwDevice::Codec()
1.65 + {
1.66 + return *iCodec;
1.67 + }
1.68 +
1.69 +/**
1.70 +*
1.71 +* ProcessL
1.72 +* @param aSrc
1.73 +* @param aDst
1.74 +* @return 'CMMFSwCodec::TCodecProcessResult'
1.75 +* this codec has a does not expand or shrink destination data
1.76 +*/
1.77 +CMMFSwCodec::TCodecProcessResult CMMFPcm16ToPcmU16CodecCodec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)
1.78 + {
1.79 + TCodecProcessResult result;
1.80 + result.iCodecProcessStatus = result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;
1.81 +
1.82 + //convert from generic CMMFBuffer to CMMFDataBuffer
1.83 + const CMMFDataBuffer* src = STATIC_CAST(const CMMFDataBuffer*, &aSrc);
1.84 + CMMFDataBuffer* dst = STATIC_CAST(CMMFDataBuffer*, &aDst);
1.85 +
1.86 + //[Check Preconditions]
1.87 + if( !CheckPreconditions( src, dst ))
1.88 + {
1.89 + //[ precondition violation ]
1.90 + User::Leave( KErrArgument );
1.91 + }
1.92 +
1.93 + //we need to cast away CONST even on the source, as the TClass needs a TUint8*
1.94 + TUint8* pSrc = CONST_CAST(TUint8*,src->Data().Ptr());
1.95 + TUint8* pDst = CONST_CAST(TUint8*,dst->Data().Ptr());
1.96 +
1.97 + TInt srcUse = src->Data().Length();
1.98 +
1.99 + TInt noSamples = srcUse/2;
1.100 + iAudioPcm16ToPcmU16.Convert(pSrc, pDst, noSamples);
1.101 +
1.102 + result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;
1.103 + result.iSrcBytesProcessed = srcUse;
1.104 + result.iDstBytesAdded = srcUse;
1.105 +
1.106 + dst->Data().SetLength(srcUse);
1.107 +
1.108 + //[ post conditions
1.109 + // srcbytes/2 == destbytes added
1.110 + // pos src == 0
1.111 + // pos dest == 0
1.112 + // src data length is even
1.113 + // dst data length is even ie pcm16 samples ]
1.114 + __ASSERT_DEBUG( (src->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
1.115 + __ASSERT_DEBUG( (dst->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
1.116 + __ASSERT_DEBUG( src->Data().Length() == dst->Data().Length(), TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
1.117 + __ASSERT_DEBUG( dst->Data().Length() % 2 == 0, TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
1.118 + __ASSERT_DEBUG( src->Data().Length() % 2 == 0, TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
1.119 +
1.120 + return result;
1.121 + }
1.122 +
1.123 +/**
1.124 +*
1.125 +* Preconditions
1.126 +* This methos tests the preconditions of the ProcessL method
1.127 +* @return TBool ETrue for sucess and EFalse for failure of the preconditions
1.128 +*
1.129 +**/
1.130 +TBool CMMFPcm16ToPcmU16CodecCodec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )
1.131 + {
1.132 + TBool result = EFalse;
1.133 +
1.134 + if(! aSrcBuffer )
1.135 + {
1.136 + return result;
1.137 + }
1.138 +
1.139 + if( ! aDestBuffer )
1.140 + {
1.141 + return result;
1.142 + }
1.143 +
1.144 + // Check position of src and dest are 0
1.145 + if( aSrcBuffer->Position() )
1.146 + {
1.147 + return result;
1.148 + }
1.149 +
1.150 + // Check position of src and dest are 0
1.151 + if( aDestBuffer->Position() )
1.152 + {
1.153 + return result;
1.154 + }
1.155 +
1.156 + // check there are sufficient bytes in the output to consume the input
1.157 + if( ( aSrcBuffer->Data().Length() > aDestBuffer->Data().MaxLength() ) ||
1.158 + ( aSrcBuffer->Data().Length() % 2 != 0 ) ) // must have pcm16 samples on input
1.159 + {
1.160 + return result;
1.161 + }
1.162 +
1.163 + result = ETrue; // preconditions have been satisfied
1.164 +
1.165 + return result;
1.166 + }