// 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