// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

#include "tonedatapath.h"

CToneDataPath* CToneDataPath::NewL()

	{

	CToneDataPath* self = new(ELeave) CToneDataPath;

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop();

	return self;

	}

void CToneDataPath::ConstructL()

	{

	iAudioPlayer = new (ELeave) CToneDataPathPlayer(*this,CActive::EPriorityUserInput);

	iSoundDeviceErrorReceiver = new (ELeave) CToneSoundDevPlayErrorReceiver(*this, CActive::EPriorityUserInput);

	}

CToneDataPath::~CToneDataPath()

	{

	delete iAudioPlayer;

	delete iSoundDeviceErrorReceiver;

	iSoundDevice.Close();

	if (iCodec)

		{

		delete iSourceBuffer;

		if (!iCodec->IsNullCodec()) 

			{

			delete iSoundDeviceBuffer;

			}

		}

#ifdef __USE_MMF_TRANSFERBUFFERS__

	delete iTransferWindow;

	if(iTransferBuffer)

		{

		iTransferBuffer->Close();

		delete iTransferBuffer;

		}

#endif

#ifdef __USE_MMF_PTRBUFFERS__

	delete iPtrBufferMemoryBlock;

#endif

	}

TInt CToneDataPath::SetObserver(MMMFHwDeviceObserver& aObserver)

	{

	TInt error;

	if (iHwDeviceObserver)

		{

		error =  KErrAlreadyExists;

		}

	else

		{

		iHwDeviceObserver = &aObserver;

		error  = KErrNone;

		}

	return error;

	}

TInt CToneDataPath::AddCodec(CToneCodec& aCodec)

	{

	if (iCodec)

		{

		return KErrNotSupported; //doesn't support multiple codecs

		}

	TInt err = KErrNone;

	iCodec = &aCodec;

	// Allocate data buffer

	iSourceBufferSize = iCodec->SourceBufferSize();

	iSoundDevBufferSize = iCodec->SinkBufferSize();

	if ((!iSourceBufferSize)||(!iSoundDevBufferSize))

		{

		err = KErrArgument; //codec plugin has not specified buffer size

		}

	if (err == KErrNone)

		{

#ifdef __USE_MMF_TRANSFERBUFFERS__

		TRAP(err,iSourceBuffer = CreateTransferBufferL(iSourceBufferSize, static_cast<CMMFTransferBuffer*>(iSourceBuffer)));

#endif

#ifdef __USE_MMF_PTRBUFFERS__

		TRAP(err,iSourceBuffer = CreatePtrBufferL(iSourceBufferSize));

#else

		TRAP(err,iSourceBuffer = CMMFDataBuffer::NewL(iSourceBufferSize));

#endif

		}

	if (err == KErrNone)

		{

		if (iCodec->IsNullCodec())

			{//use source buffer for sound device buffer	

			iSoundDeviceBuffer = NULL;

			}

		else

			{//codec needs separate source and sound device buffers

			TRAP(err,iSoundDeviceBuffer = CMMFDataBuffer::NewL(iSoundDevBufferSize));

			}

		}

	return err;

	}

TInt CToneDataPath::Start()

	{

	TInt startError = KErrNone;

	if (!iCodec) 

		{//check that a codec has been added

		startError = KErrNotReady;

		}

	if ((!iSoundDevice.Handle())&&(!startError))

    	{//check that the sound drivers can be opened

   		startError = iSoundDevice.Open();

		}

	if (iState == EPaused)

		{//we are paused so need to resume play

		if (!startError)

			{

#ifdef _SCW_DEBUG

			RDebug::Print(_L("CToneDataPath::Start-Resume"));

#endif

			iAudioPlayer->ResumePlaying();

			iState = EPlaying;

			}

		}

	else if (!startError)

		{

#ifdef _SCW_DEBUG

		RDebug::Print(_L("CToneDataPath::Start-Normal"));

#endif

		// get sample rate and channels from RMdaDevSound

		RMdaDevSound::TCurrentSoundFormatBuf format;

		iSoundDevice.GetPlayFormat(format);

		iSampleRate = format().iRate;

		iChannels = format().iChannels;

		iNoMoreSourceData = EFalse;

		iSourceBuffer->SetLastBuffer(EFalse);

		iState = EPlaying;

		iSoundDeviceErrorReceiver->Start();

		TRAP(startError,FillSourceBufferL()); //get initial buffer of audio data

		if (startError == KErrNone)

			{

			// Start the player objects

			iAudioPlayer->Start();

			}

		else

			{//failed to start up correctly go back to stopped state

			iState = EStopped;

			iSoundDeviceErrorReceiver->Stop();

			}

   		}

	return startError;

	}

// *** Main Play Loop ***

void CToneDataPath::FillSourceBufferL()

	{//asks observer to fill the source buffer          

    // Ask immediately for data from the observer

#ifdef __CYCLE_MMF_DATABUFFERS__

	// Create a new buffer to replicate INC021405 Play-EOF-Play on HwAccelerated solution Panics

	// If the creation fails, we carry on regardless as the original buffer will not have been 

	// destroyed. Must do this as alloc fail tests will not run.

	if(iSourceBuffer)

		{

		iSourceBuffer = CycleAudioBuffer(iSourceBuffer);

		}

#endif // __CYCLE_MMF_DATABUFFERS__	

	User::LeaveIfError(iHwDeviceObserver->FillThisHwBuffer(*iSourceBuffer));

	}

void CToneDataPath::BufferFilledL(CMMFDataBuffer& aBuffer)

	{//call back from observer to indicate buffer has been filled

	if (iState == EStopped)

		{

		User::Leave(KErrNotReady);//ok if paused?

		}

	iSourceBuffer = &aBuffer;

	iSourceBuffer->SetStatus(EFull);

#ifdef _SCW_DEBUG

	RDebug::Print(_L("CToneDataPath::BufferFilledL"));

#endif

	//need to check that the buffer size is not 0 - if so assume we've reached the end of the data

	iBuffSize = iSourceBuffer->BufferSize();

	if (!iBuffSize)

		{//no buffer  - could be end of source or could be that the source has no data??

		iNoMoreSourceData = ETrue;

#ifdef _SCW_DEBUG

		RDebug::Print(_L("CToneDataPath::BufferFilledL-NoMoreSourceData"));

#endif

		}

	//even if the buffer size is 0 we still 

	//need to perform the following to get the sound device callback

	FillSoundDeviceBufferL(); //get buffer in pcm16 format for sound device	

	iAudioPlayer->PlayData(*iSoundDeviceBuffer); //play data to sound drivers

	}

void CToneDataPath::FillSoundDeviceBufferL()

	{//use CToneCodec to fill the sound device buffer

	CToneCodec::TCodecProcessResult codecProcessResult;

	if (iCodec->IsNullCodec())

		{//no codec so data can be sent direct to sink

		iSoundDeviceBuffer = iSourceBuffer;

		iSoundDeviceBuffer->SetStatus(EFull);	//sink buffer is full

		}

	else 

		{

		//pass buffer to codec for processing

		codecProcessResult = iCodec->ProcessL(*iSourceBuffer, *iSoundDeviceBuffer);

		if (iSourceBuffer->LastBuffer()) //if source is last buffer so is sound dev

			{

			iSoundDeviceBuffer->SetLastBuffer(ETrue);

			}

		if ((!iSoundDeviceBuffer->BufferSize())&&(codecProcessResult.iDstBytesAdded))

			{//the codec has added data but not set the buffer length

			iSoundDeviceBuffer->Data().SetLength(codecProcessResult.iDstBytesAdded);

			}

		//only supports EProcessComplete

		switch (codecProcessResult.iCodecProcessStatus)

			{

		case CToneCodec::TCodecProcessResult::EProcessComplete:

		//finished procesing source data - all data in sink buffer

			{

			iSoundDeviceBuffer->SetStatus(EFull);	//sink buffer is full	

			}

		break;

#ifdef SYMBIAN_VARIABLE_BITRATE_CODEC

		case CToneCodec::TCodecProcessResult::EProcessIncomplete:

		//finished procesing source data - all data in sink buffer

			{

			iSoundDeviceBuffer->SetStatus(EFull);	//sink buffer is full	

			}

		break;

#endif

		case CToneCodec::TCodecProcessResult::EDstNotFilled:

		//could be the last buffer in which case dst might not get filled

			{

			iSoundDeviceBuffer->SetStatus(EFull);	//sink buffer is full	

			}

		break;

		case CToneCodec::TCodecProcessResult::EEndOfData:

			//no more data - send what we've got to the sink

			//note we can't always rely on this  - in many cases the codec will not know when

			//it has reached the end of data.

			{

			iSoundDeviceBuffer->SetStatus(EFull);//sink buffer may not really be 'full' but its as full as it going to get

			iNoMoreSourceData = ETrue;

			//doesn't matter if sink buffer is not full

			}

		break;

		default:

			//Panic(EMMFSwCodecWrapperBadCodec); //should never get here - bad codec

			break;

			}

		}

	}

void CToneDataPath::BufferEmptiedL(const CMMFDataBuffer& aBuffer)

	{//call back from CToneDataPathPlayer when the sound device buffer has been emptied

	if (&aBuffer != iSoundDeviceBuffer) 

		{

		Panic(EToneBadBuffer);

		}

	if (!iNoMoreSourceData) 

		{

		FillSourceBufferL();

		}

	}

//*** End of Main Play Loop ***

void CToneDataPath::Stop()

	{

	iAudioPlayer->Cancel();

	iSoundDeviceErrorReceiver->Cancel();

    iSoundDevice.Close();

#ifdef __CYCLE_MMF_DATABUFFERS__

	// Create a new buffer to replicate INC021405 Play-EOF-Play on HwAccelerated solution Panics

	// If the creation fails, we carry on regardless as the original buffer will not have been 

	// destroyed. Must do this as alloc fail tests will not run.

	if(iSourceBuffer)

		{

		iSourceBuffer = CycleAudioBuffer(iSourceBuffer);

		}

#endif // __CYCLE_MMF_DATABUFFERS__	

	iState = EStopped;

	}

void CToneDataPath::Pause()

	{

	//since a pause can happen anyway in the datatransfer -need to set to a known 

	//state so that when play is resumed the behaviour is predictable

	if (iSoundDevice.Handle())

		{

		iSoundDevice.PausePlayBuffer(); //needs new LDD

		iState = EPaused;

#ifdef _SCW_DEBUG

		RDebug::Print(_L("Pause"));

#endif

		}

	else

		{//an error must have occured 

		iState = EStopped;

		}

	}

TInt CToneDataPath::EmptyBuffers()

	{

	TInt error = KErrNone;

	if (iSoundDevice.Handle() == 0)

		{

		error = KErrNotReady;		

		}

	else

		{

		iSoundDevice.FlushPlayBuffer();

		}

	return error;

	}	

RMdaDevSound& CToneDataPath::Device()

	{

	return iSoundDevice;

	}

void CToneDataPath::SoundDeviceException(TInt aError)

	{

	if(iIgnoreUnderflow)

		{

		if((aError == KErrUnderflow) && (!iNoMoreSourceData))

			{

			//ignore underflow

			return;

			}

		}

	//this sends a request to the hw device observer

	//to update the bytes played

	//it is done here so that the sound driver can be closed prior to

	//updating the policy and sending the error back

	TUid uidUpdateBytesPlayed;

	uidUpdateBytesPlayed.iUid = KToneHwDeviceObserverUpdateBytesPlayed;

	TPtrC8 dummy(0,0);

	ASSERT(iHwDeviceObserver);

	iHwDeviceObserver->MsgFromHwDevice(uidUpdateBytesPlayed,dummy);

	//this closes RMdaDevSound.

	Stop(); 

	//inform devsound so it can update policy

	iHwDeviceObserver->Stopped(); 

	// Inform the observer of the exception condition

	// We inform the hw device observer after the policy has been

	// updated incase the observer relied on the error to assume

	// the policy has been updated

	iHwDeviceObserver->Error(aError);

	RDebug::Print(_L("CToneDataPath::iHwDeviceObserver->Error(%d)"),aError);

	}

/**

Retrieves a custom interface to the device.

The reference CToneDataPath supports three  custom interfaces,

MEmptyBuffersCustomInterface, MSetVbrFlagCustomInterface and MIgnoreUnderflowEventsCustomInterface

@param	aInterface

		Interface UID, defined with the custom interface.

		aInterface = KMmfUidEmptyBuffersCustomInterface for MEmptyBuffersCustomInterface,

					 KSetVbrFlagCustomInterfaceTypeUid for MSetVbrFlagCustomInterface

@return A pointer to the interface implementation, or NULL if the device can not

		implement the interface requested. The return value must be cast to the

		correct type by the user.

*/

TAny* CToneDataPath::CustomInterface(TUid aInterface)

	{

	TAny* ret = NULL;

	if (aInterface == KIgnoreUnderflowCustomInterfaceTypeUid)

		{

		MIgnoreUnderflowEventsCustomInterface* result = static_cast<MIgnoreUnderflowEventsCustomInterface*> (this);

		ret = static_cast<TAny*>(result);

		}

	return ret;

	}

void CToneDataPath::IgnoreUnderflowEvents()

	{

	iIgnoreUnderflow = ETrue;

	}

/************************************************************************

 *				CDataPathPlayer											*

 ************************************************************************/

CToneDataPathPlayer::CToneDataPathPlayer(CToneDataPath& aParent, TInt aPriority)

: CActive(aPriority), iParent(aParent)

	{

	CActiveScheduler::Add(this);

	}

CToneDataPathPlayer::~CToneDataPathPlayer()

	{

	Cancel();

	}

void CToneDataPathPlayer::Start()

	{

	// No implementation

	}

void CToneDataPathPlayer::ResumePlaying()

	{

	if (iParent.Device().Handle())

		{

		//should be ok to call this even if we are active

		iParent.Device().ResumePlaying(); 

		iResumePlaying = ETrue;

		}

#ifdef _SCW_DEBUG

	RDebug::Print(_L("Playing Resumed"));

#endif

	}

void CToneDataPathPlayer::PlayData(const CMMFDataBuffer& aData)

	{

	iDataFromSource = &aData;

	if (!IsActive())

		{

#ifdef _SCW_DEBUG

		RDebug::Print(_L("CToneDataPathPlayer::PlayData"));

#endif

		iParent.Device().PlayData(iStatus,(static_cast<const CMMFDataBuffer*> (iDataFromSource))->Data());

		SetActive();

		}

	}

void CToneDataPathPlayer::Stop()

	{

	if (!IsActive())

		{

		iParent.Device().FlushPlayBuffer(); // Otherwise won't be flushed

		}

	Cancel();

	iParent.SoundDeviceException(KErrCancel);

	}

void CToneDataPathPlayer::RunL()

	{

#ifdef _SCW_DEBUG

	RDebug::Print(_L("CToneDataPathPlayer::RunL error[%d]"), iStatus.Int());

#endif

	if (iStatus.Int()!=KErrNone)

		{

		iParent.SoundDeviceException(iStatus.Int());

		}

	else

		{

		iParent.BufferEmptiedL(static_cast<const CMMFDataBuffer&>(*iDataFromSource));

		iResumePlaying = EFalse;

		}

	}

TInt CToneDataPathPlayer::RunError(TInt aError)

	{

	Error(aError);

	return KErrNone;