sl@0: // Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #include "MmfBtAudioCodec.h"
sl@0: #include <mmfpaniccodes.h>
sl@0: #include "MmfBtImaAdpcmToPcm16HwDevice.h"
sl@0: #include "../../MmfBtFileDependencyUtil.h"
sl@0: 
sl@0: /**
sl@0: *
sl@0: * NewL
sl@0: *
sl@0: */
sl@0: CMMFImaAdpcmToPcm16CodecHwDevice* CMMFImaAdpcmToPcm16CodecHwDevice::NewL()
sl@0: 	{
sl@0: 	CMMFImaAdpcmToPcm16CodecHwDevice* self=new(ELeave)CMMFImaAdpcmToPcm16CodecHwDevice();
sl@0: 	CleanupStack::PushL(self);
sl@0: 	self->ConstructL();
sl@0: 	CleanupStack::Pop(self);
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: *
sl@0: * ConstructL
sl@0: *
sl@0: */
sl@0: void CMMFImaAdpcmToPcm16CodecHwDevice::ConstructL()
sl@0: 	{
sl@0: 	iCodec = new (ELeave) CMMFImaAdpcmToPcm16Codec();
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: *
sl@0: * ~CMMFMulawPcm16HwDevice
sl@0: *
sl@0: */
sl@0: CMMFImaAdpcmToPcm16CodecHwDevice::~CMMFImaAdpcmToPcm16CodecHwDevice()
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: *
sl@0: * Codec
sl@0: *
sl@0: */
sl@0: CMMFSwCodec &CMMFImaAdpcmToPcm16CodecHwDevice::Codec()
sl@0: 	{
sl@0: 	return *iCodec;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: @see CMMFSwCodecWrapper::Start
sl@0: 
sl@0: this function sets SampleRate and Channels for CMMFImaAdpcmToPcm16Codec
sl@0: */
sl@0: TInt CMMFImaAdpcmToPcm16CodecHwDevice::Start(TDeviceFunc aFuncCmd, TDeviceFlow aFlowCmd)
sl@0: 	{
sl@0: 	TInt err = CMMFSwCodecWrapper::Start(aFuncCmd, aFlowCmd);
sl@0: 	if (err != 0)
sl@0: 		return err;
sl@0: 	return ((CMMFImaAdpcmToPcm16Codec*)iCodec)->Configure(iChannels, iSampleRate);
sl@0: 	}
sl@0: 
sl@0: CMMFImaAdpcmToPcm16Codec::CMMFImaAdpcmToPcm16Codec()
sl@0: 	{
sl@0: 	iChannels = 1;
sl@0: 	iSampleRate = 0;
sl@0: 	iBlockAlign = KImaAdpcmBlockAlign;
sl@0: 	iSamplesPerBlock = KImaAdpcmSamplesPerBlock;
sl@0: 	}
sl@0: /**
sl@0: *
sl@0: * ProcessL
sl@0: * @param aSrc
sl@0: * @param aDst
sl@0: * @pre position of buffer aSrc is 0
sl@0: * @pre position of buffer aDst is 0
sl@0: * @pre sufficient bytes in output to consume input
sl@0: * @return TCodecProcessResult
sl@0: * This function converts IMA ADPCM samples to PCM samples.
sl@0: *
sl@0: */
sl@0: CMMFSwCodec::TCodecProcessResult CMMFImaAdpcmToPcm16Codec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)
sl@0: 	{
sl@0: 	CMMFSwCodec::TCodecProcessResult result;
sl@0: 	result.iCodecProcessStatus = 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;
sl@0: 	
sl@0: 	//convert from generic CMMFBuffer to CMMFDataBuffer
sl@0: 	const CMMFDataBuffer* src = STATIC_CAST(const CMMFDataBuffer*, &aSrc);
sl@0: 	CMMFDataBuffer* dst = STATIC_CAST(CMMFDataBuffer*, &aDst);
sl@0: 	
sl@0: 	if( !CheckPreconditions( src, dst ) )
sl@0: 		{
sl@0: 		//[ precondition(s) violation ]
sl@0: 		User::Leave(KErrArgument);
sl@0: 		}
sl@0: 	
sl@0: 	//calculate how much source is required to fill the destination buffer
sl@0: 	TUint blocksRemaining = src->Data().Length() / iBlockAlign;
sl@0: 	
sl@0: 	//we need to cast away CONST even on the source, as the TClass needs a TUint8*
sl@0: 	TUint8* pSrc = CONST_CAST(TUint8*,src->Data().Ptr());
sl@0: 	TUint8* pDst = CONST_CAST(TUint8*,dst->Data().Ptr());
sl@0: 	
sl@0: 	//[ [process full blocks ]
sl@0: 	TUint dstBytesAdded = 0;
sl@0: 	for( TUint count = 0; count < blocksRemaining; count++ )
sl@0: 		{
sl@0: 		iImaAdpcmTo16Pcm.Convert(pSrc, pDst, iSamplesPerBlock);
sl@0: 		pSrc += iBlockAlign;
sl@0: 		pDst += (iSamplesPerBlock * sizeof(TInt16));
sl@0: 		dstBytesAdded += (iSamplesPerBlock * sizeof(TInt16));	
sl@0: 		}
sl@0: 	
sl@0: 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;	
sl@0: 	result.iSrcBytesProcessed = blocksRemaining * iBlockAlign;
sl@0: 	result.iDstBytesAdded = dstBytesAdded;
sl@0: 	dst->Data().SetLength(result.iDstBytesAdded);
sl@0: 	
sl@0: 	//[ check post conditions
sl@0: 	__ASSERT_DEBUG( (src->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
sl@0: 	__ASSERT_DEBUG( (dst->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
sl@0: 	TInt r1 = src->Data().Length();
sl@0: 	r1 /= iBlockAlign;
sl@0: 	TInt r2 =  dst->Data().Length();
sl@0: 	r2 /=(iSamplesPerBlock * sizeof(TInt16));
sl@0: 	__ASSERT_DEBUG(  r1== r2, TMmfAudioCodecPanicsNameSpace::Panic(TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
sl@0: 	__ASSERT_DEBUG( dst->Data().Length() % 2 == 0, TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); // pcm output
sl@0: 	
sl@0: 	return result;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: *
sl@0: * Preconditions
sl@0: * This methos tests the preconditions of the ProcessL method
sl@0: * @return TBool ETrue for sucess and EFalse for failure of the preconditions
sl@0: *
sl@0: **/
sl@0: TBool CMMFImaAdpcmToPcm16Codec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )
sl@0: 	{
sl@0: 	TBool result = EFalse;
sl@0: 	
sl@0: 	if(! aSrcBuffer )
sl@0: 		{
sl@0: 		return result;
sl@0: 		}
sl@0: 	
sl@0: 	if( ! aDestBuffer )
sl@0: 		{
sl@0: 		return result;
sl@0: 		}
sl@0: 	
sl@0: 	// Check position of src and dest are 0
sl@0: 	if( aSrcBuffer->Position() )
sl@0: 		{
sl@0: 		return result;
sl@0: 		}
sl@0: 	
sl@0: 	// Check position of src and dest are 0
sl@0: 	if( aDestBuffer->Position() )
sl@0: 		{
sl@0: 		return result;
sl@0: 		}
sl@0: 	
sl@0: 	// check there are sufficient bytes in the output to consume the input
sl@0: 	const TUint KTempBufferSize = iSamplesPerBlock * 2;
sl@0:     TInt numInputSubFrames  = aSrcBuffer->Data().Length() / iBlockAlign;
sl@0: 	TInt numOutputSubFrames = aDestBuffer->Data().MaxLength() / KTempBufferSize;
sl@0: 
sl@0: 	//[ we need modulo 1010 bytes on all src frames that are not the last
sl@0: 	// frame
sl@0: 	// For the last frame we will code only whole frames and effectively
sl@0: 	// drop any remaining samples]	
sl@0: 	TBool validInputDataLength = (aSrcBuffer->Data().Length() % iBlockAlign == 0) ;
sl@0:     
sl@0: 	if( (numInputSubFrames > numOutputSubFrames) ||  // sufficient space in the output for the input
sl@0:         (aSrcBuffer->Position() > 0 )  ||                   // position must be zero since we can eat all the data
sl@0: 		(aDestBuffer->Position() > 0 ) ||
sl@0: 		(!validInputDataLength))                         //position must be zero
sl@0: 		{
sl@0: 		return result;
sl@0: 		}
sl@0: 	
sl@0: 	result = ETrue;  // preconditions have been satisfied
sl@0: 	
sl@0: 	return result;
sl@0: 	}
sl@0: 
sl@0: TInt CMMFImaAdpcmToPcm16Codec::Configure(TUint aChannels, TUint aSampleRate)
sl@0: 	{
sl@0: 	iChannels = aChannels;
sl@0: 	iSampleRate = aSampleRate;
sl@0: 	
sl@0: 	switch (iSampleRate * iChannels)
sl@0: 		{
sl@0: 		case 8000: // fall through, same as 11025
sl@0: 		case 11025:
sl@0: 		case 16000:
sl@0: 			iBlockAlign = 256;
sl@0: 			break;
sl@0: 		case 22050:
sl@0: 			iBlockAlign = 512;
sl@0: 			break;
sl@0: 			
sl@0: 		case 44100:
sl@0: 			iBlockAlign = 1024;
sl@0: 			break;
sl@0: 			
sl@0: 		case 88200:
sl@0: 			iBlockAlign = 2048;
sl@0: 			break;
sl@0: 			
sl@0: 		default:
sl@0: 			return KErrArgument;
sl@0: 		}
sl@0: 	
sl@0: 	const TUint KImaAdpcmBitsPerSample = 4;
sl@0: 	// SamplesPerBlock = [(BlockAlign - 4 * Channels) * 8] / (BitsPerSample * Channels) + 1
sl@0: 	iSamplesPerBlock = (iBlockAlign - 4 * iChannels) * 8 / (KImaAdpcmBitsPerSample * iChannels) + 1;
sl@0: 	
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: