// Copyright (c) 2006-2009 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 <e32debug.h>

#include "mdfplayerengine.h"

#if defined (SYMBIAN_MDFPLAYERENGINE_DEBUG)

#define DEBUG_PRINT RDebug::Print

#else

#define DEBUG_PRINT

#endif // defined(SYMBIAN_MDFPLAYERENGINE_DEBUG)

const TInt KOneSecond = 1000000;

/* 

 Constructs a new instance of CMdfVideoPlayerEngine.

 @return    "CMdfVideoPlayerEngine*"

            A pointer to the newly constructed CMdfVideoPlayerEngine

 */

CMdfVideoPlayerEngine* CMdfVideoPlayerEngine::NewL(MMdfVideoPlayerHwDeviceObserver& aDeviceObserver)

	{

	CMdfVideoPlayerEngine* self = new (ELeave) CMdfVideoPlayerEngine(aDeviceObserver);

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop(self);

	return self;	

	}

/** 

 Constructs and initialises a new instance of CMdfVideoPlayerEngine.

 @param     "MMdfVideoPlayerHwDeviceObserver& aDeviceObserver"

            A reference to the HwDevice on which it will operate

 */

CMdfVideoPlayerEngine::CMdfVideoPlayerEngine(MMdfVideoPlayerHwDeviceObserver& aDeviceObserver)

	: iDeviceObserver(aDeviceObserver)

	{	

	}

void CMdfVideoPlayerEngine::ConstructL()

	{

	iTimer = CPeriodic::NewL(EPriorityHigh);		

	}

/** 

 Default destructor

 */

CMdfVideoPlayerEngine::~CMdfVideoPlayerEngine()

	{

	// stop if we need to

	Stop();

	}

/** 

 Starts the player engine.

 @param     "TUint aFrameRate"

            The actual frame rate for display, or KUnsynchronized

 @leave		May leave with KErrNotReady if the frame rate is not initialized.            

 */

void CMdfVideoPlayerEngine::StartL(TUint aFrameRate)

	{

	if(aFrameRate == 0) 

		{

		User::Leave(KErrNotReady);

		}

	iFrameRate = aFrameRate;

	// get current tick count, save this

	iStartTime = iDeviceObserver.Time();

	iFrameCount = 0;

	DEBUG_PRINT(_L("+++ PlayerEngine: Starting"));

    iTimer->Cancel();

    iTimer->Start(KMaxFrameRate, KMaxFrameRate, TCallBack(DisplayFrame, this));

	}

/** 

 Stops the player engine.

 */

void CMdfVideoPlayerEngine::Stop()

	{

	if(iTimer) 

		{

		DEBUG_PRINT(_L("+++ PlayerEngine: Stopping"));

	    iTimer->Cancel();

	    delete iTimer;

	    iTimer = NULL;

		}

	}

/**

 Returns the frame rate.

 @return The frame rate.

*/	

TInt CMdfVideoPlayerEngine::FrameRate()

	{

	return iFrameRate;

	}

/**

 Returns the frame count.

 @return The frame count.

*/	

TInt CMdfVideoPlayerEngine::FrameCount()

	{

	return iFrameCount;

	}

/** 

 Static callback method for the CPeriodic timer

 */

TInt CMdfVideoPlayerEngine::DisplayFrame(TAny* aObject)

	{

    // cast, and call non-static function

    (reinterpret_cast<CMdfVideoPlayerEngine*>(aObject))->DoDisplayFrame();

    return KErrNone;

	}

/** 

 Processes one frame if available.

 */

void CMdfVideoPlayerEngine::DoDisplayFrame()

	{

	if(iDeviceObserver.FrameAvailable()) 

		{

		// if we're playing unsynchronized, then return the frame

		// regardless of time

		if(iFrameRate == KUnsynchronized) 

			{

			iFrameCount++;	

			DEBUG_PRINT(_L("+++ PlayerEngine: Sending frame buffer to DevVideo"));

			iDeviceObserver.DisplayFrame();

			}

		else 

			{

			TUint curPlayTime = iDeviceObserver.Time();

			// if we've missed a tick, then discard the frame.

			// (unless it's the first frame; always display this)

			if(iFrameCount) 

				{

				TUint nextNextFrameTime = iStartTime + ((iFrameCount + 1) * (KOneSecond / iFrameRate));

				if(nextNextFrameTime <= curPlayTime) 

					{

					iFrameCount++;	

					DEBUG_PRINT(_L("+++ PlayerEngine: Discarding frame buffer"));

					iDeviceObserver.DiscardFrame();

					return;

					}

				}

			// else if we're past the expected display time

			// then display the frame.

			TUint nextFrameTime = iStartTime + (iFrameCount * (KOneSecond / iFrameRate));

			if(!iFrameCount || nextFrameTime <= curPlayTime) 

				{

				iFrameCount++;	

				DEBUG_PRINT(_L("+++ PlayerEngine: Sending frame buffer to DevVideo"));

				iDeviceObserver.DisplayFrame();

				}

			}

		}

	}

// end