sl@0: // Copyright (c) 2006-2009 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 <e32debug.h>
sl@0: 
sl@0: #include "mdfplayerengine.h"
sl@0: 
sl@0: #if defined (SYMBIAN_MDFPLAYERENGINE_DEBUG)
sl@0: #define DEBUG_PRINT RDebug::Print
sl@0: #else
sl@0: #define DEBUG_PRINT
sl@0: #endif // defined(SYMBIAN_MDFPLAYERENGINE_DEBUG)
sl@0: 
sl@0: const TInt KOneSecond = 1000000;
sl@0: 
sl@0: /* 
sl@0:  Constructs a new instance of CMdfVideoPlayerEngine.
sl@0:  @return    "CMdfVideoPlayerEngine*"
sl@0:             A pointer to the newly constructed CMdfVideoPlayerEngine
sl@0:  */
sl@0: CMdfVideoPlayerEngine* CMdfVideoPlayerEngine::NewL(MMdfVideoPlayerHwDeviceObserver& aDeviceObserver)
sl@0: 	{
sl@0: 	CMdfVideoPlayerEngine* self = new (ELeave) CMdfVideoPlayerEngine(aDeviceObserver);
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:  Constructs and initialises a new instance of CMdfVideoPlayerEngine.
sl@0:  
sl@0:  @param     "MMdfVideoPlayerHwDeviceObserver& aDeviceObserver"
sl@0:             A reference to the HwDevice on which it will operate
sl@0:  */
sl@0: CMdfVideoPlayerEngine::CMdfVideoPlayerEngine(MMdfVideoPlayerHwDeviceObserver& aDeviceObserver)
sl@0: 	: iDeviceObserver(aDeviceObserver)
sl@0: 	{	
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void CMdfVideoPlayerEngine::ConstructL()
sl@0: 	{
sl@0: 	iTimer = CPeriodic::NewL(EPriorityHigh);		
sl@0: 	}
sl@0: 
sl@0: /** 
sl@0:  Default destructor
sl@0:  */
sl@0: CMdfVideoPlayerEngine::~CMdfVideoPlayerEngine()
sl@0: 	{
sl@0: 	// stop if we need to
sl@0: 	Stop();
sl@0: 	}
sl@0: 
sl@0: /** 
sl@0:  Starts the player engine.
sl@0:  
sl@0:  @param     "TUint aFrameRate"
sl@0:             The actual frame rate for display, or KUnsynchronized
sl@0:  @leave		May leave with KErrNotReady if the frame rate is not initialized.            
sl@0:  */
sl@0: void CMdfVideoPlayerEngine::StartL(TUint aFrameRate)
sl@0: 	{
sl@0: 	if(aFrameRate == 0) 
sl@0: 		{
sl@0: 		User::Leave(KErrNotReady);
sl@0: 		}
sl@0: 	
sl@0: 	iFrameRate = aFrameRate;
sl@0: 	
sl@0: 	// get current tick count, save this
sl@0: 	iStartTime = iDeviceObserver.Time();
sl@0: 	iFrameCount = 0;
sl@0: 	
sl@0: 	DEBUG_PRINT(_L("+++ PlayerEngine: Starting"));
sl@0:     iTimer->Cancel();
sl@0:     iTimer->Start(KMaxFrameRate, KMaxFrameRate, TCallBack(DisplayFrame, this));
sl@0: 	}
sl@0:       
sl@0: /** 
sl@0:  Stops the player engine.
sl@0:  */
sl@0: void CMdfVideoPlayerEngine::Stop()
sl@0: 	{
sl@0: 	if(iTimer) 
sl@0: 		{
sl@0: 		DEBUG_PRINT(_L("+++ PlayerEngine: Stopping"));
sl@0: 	    iTimer->Cancel();
sl@0: 	    delete iTimer;
sl@0: 	    iTimer = NULL;
sl@0: 		}
sl@0: 	}
sl@0: 	
sl@0: /**
sl@0:  Returns the frame rate.
sl@0:  
sl@0:  @return The frame rate.
sl@0: */	
sl@0: TInt CMdfVideoPlayerEngine::FrameRate()
sl@0: 	{
sl@0: 	return iFrameRate;
sl@0: 	}
sl@0: 	
sl@0: /**
sl@0:  Returns the frame count.
sl@0:  
sl@0:  @return The frame count.
sl@0: */	
sl@0: TInt CMdfVideoPlayerEngine::FrameCount()
sl@0: 	{
sl@0: 	return iFrameCount;
sl@0: 	}
sl@0: 
sl@0: /** 
sl@0:  Static callback method for the CPeriodic timer
sl@0:  */
sl@0: TInt CMdfVideoPlayerEngine::DisplayFrame(TAny* aObject)
sl@0: 	{
sl@0:     // cast, and call non-static function
sl@0:     (reinterpret_cast<CMdfVideoPlayerEngine*>(aObject))->DoDisplayFrame();
sl@0:     return KErrNone;
sl@0: 	}
sl@0: 
sl@0: /** 
sl@0:  Processes one frame if available.
sl@0:  */
sl@0: void CMdfVideoPlayerEngine::DoDisplayFrame()
sl@0: 	{
sl@0: 	if(iDeviceObserver.FrameAvailable()) 
sl@0: 		{
sl@0: 		// if we're playing unsynchronized, then return the frame
sl@0: 		// regardless of time
sl@0: 		if(iFrameRate == KUnsynchronized) 
sl@0: 			{
sl@0: 			iFrameCount++;	
sl@0: 			DEBUG_PRINT(_L("+++ PlayerEngine: Sending frame buffer to DevVideo"));
sl@0: 			iDeviceObserver.DisplayFrame();
sl@0: 			}
sl@0: 		else 
sl@0: 			{
sl@0: 			TUint curPlayTime = iDeviceObserver.Time();
sl@0: 		
sl@0: 			// if we've missed a tick, then discard the frame.
sl@0: 			// (unless it's the first frame; always display this)
sl@0: 			if(iFrameCount) 
sl@0: 				{
sl@0: 				TUint nextNextFrameTime = iStartTime + ((iFrameCount + 1) * (KOneSecond / iFrameRate));
sl@0: 				if(nextNextFrameTime <= curPlayTime) 
sl@0: 					{
sl@0: 					iFrameCount++;	
sl@0: 					DEBUG_PRINT(_L("+++ PlayerEngine: Discarding frame buffer"));
sl@0: 					iDeviceObserver.DiscardFrame();
sl@0: 					return;
sl@0: 					}
sl@0: 				}
sl@0: 			// else if we're past the expected display time
sl@0: 			// then display the frame.
sl@0: 			TUint nextFrameTime = iStartTime + (iFrameCount * (KOneSecond / iFrameRate));
sl@0: 			if(!iFrameCount || nextFrameTime <= curPlayTime) 
sl@0: 				{
sl@0: 				iFrameCount++;	
sl@0: 				DEBUG_PRINT(_L("+++ PlayerEngine: Sending frame buffer to DevVideo"));
sl@0: 				iDeviceObserver.DisplayFrame();
sl@0: 				}
sl@0: 			}
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: // end