1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/mm/devsound/devsoundrefplugin/src/plugin/audio/mmfpcmS16PcmS8HwDevice.cpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,159 @@
     1.4 +// Copyright (c) 2003-2009 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 "mmfpcmS16PcmS8HwDevice.h"
    1.20 +
    1.21 +/**
    1.22 + *
    1.23 + *	Returns the created hw device for passing audio through audio.
    1.24 + *  for the wins implementation this would always be pcm16 although
    1.25 + *  this is effectively a null hw device that will pass any datatype through
    1.26 + *	@return	"CMMFPcm16ToPcmU16BEHwDevice"
    1.27 + *
    1.28 + */
    1.29 +CMMFPcmS16ToPcmS8HwDevice* CMMFPcmS16ToPcmS8HwDevice::NewL()
    1.30 +	{
    1.31 +    CMMFPcmS16ToPcmS8HwDevice* self = new (ELeave) CMMFPcmS16ToPcmS8HwDevice();
    1.32 +	CleanupStack::PushL(self);
    1.33 +	self->ConstructL();
    1.34 +	CleanupStack::Pop(self);
    1.35 +	return self;
    1.36 +	}
    1.37 +
    1.38 +/**
    1.39 +*
    1.40 +* ~CMMFPcmS16ToPcmS8HwDevice
    1.41 +*/
    1.42 +CMMFPcmS16ToPcmS8HwDevice::~CMMFPcmS16ToPcmS8HwDevice()
    1.43 +	{
    1.44 +	}
    1.45 +
    1.46 +/**
    1.47 +*
    1.48 +* ConstructL
    1.49 +*
    1.50 +*/
    1.51 +void CMMFPcmS16ToPcmS8HwDevice::ConstructL()
    1.52 +	{
    1.53 +	iCodec = new (ELeave) CMMFPcmS16ToPcmS8Codec();
    1.54 +	}
    1.55 +
    1.56 +/**
    1.57 +*
    1.58 +* Codec
    1.59 +* @return 'CMMFSwCodec&'
    1.60 +*
    1.61 +*/
    1.62 +CMMFSwCodec& CMMFPcmS16ToPcmS8HwDevice::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 +* @param aSamples
    1.73 +*
    1.74 +*/
    1.75 +CMMFSwCodec::TCodecProcessResult CMMFPcmS16ToPcmS8Codec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)
    1.76 +	{
    1.77 +	TCodecProcessResult result;
    1.78 +	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;
    1.79 +	
    1.80 +	//convert from generic CMMFBuffer to CMMFDataBuffer
    1.81 +	const CMMFDataBuffer* src = STATIC_CAST(const CMMFDataBuffer*, &aSrc);
    1.82 +	CMMFDataBuffer* dst = STATIC_CAST(CMMFDataBuffer*, &aDst);
    1.83 +	
    1.84 +	//[Check Preconditions]
    1.85 +	if( !CheckPreconditions( src, dst ))
    1.86 +		{
    1.87 +		//[ precondition violation ]
    1.88 +		User::Leave( KErrArgument );
    1.89 +		}
    1.90 +	
    1.91 +	//we need to cast away CONST even on the source, as the TClass needs a TUint8*
    1.92 +	TUint8* pSrc = CONST_CAST(TUint8*,src->Data().Ptr());
    1.93 +	TUint8* pDst = CONST_CAST(TUint8*,dst->Data().Ptr());
    1.94 +    
    1.95 +	TInt srcUse = src->Data().Length();
    1.96 +	TInt noSamples = srcUse/2;
    1.97 +	
    1.98 +	//compress TWO bytes (16-bit PCM word) into a to 1 byte sample
    1.99 +	iAudioPcmS16ToPcmS8.Convert(pSrc, pDst, noSamples );
   1.100 +	
   1.101 +	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;
   1.102 +	result.iSrcBytesProcessed  = srcUse;
   1.103 +	result.iDstBytesAdded      = srcUse/2;
   1.104 +	
   1.105 +	dst->Data().SetLength(result.iDstBytesAdded);
   1.106 +	
   1.107 +	//[ post conditions
   1.108 +    // srcbytes/2 == destbytes added
   1.109 +	// pos src == 0
   1.110 +	// pos dest == 0 ]
   1.111 +	__ASSERT_DEBUG( (src->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
   1.112 +	__ASSERT_DEBUG( (dst->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
   1.113 +	__ASSERT_DEBUG( src->Data().Length()/2 == dst->Data().Length(), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
   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 CMMFPcmS16ToPcmS8Codec::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()/2 > 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 +