examples/SFExamples/Quick_Recipes_on_Symbian_OS_Multimedia_Example_Code/MidiPlaying/src/MidiPlayer.cpp

// 
// Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
// All rights reserved.
// This component and the accompanying materials are made available
// under the terms of the License "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 FILES
#include <eikenv.h>
#include "MidiPlayer.h"

// CONSTANTS
const TInt KVolumeDenominator = 2;

// METHODS DEFINITION

CMidiPlayer::CMidiPlayer()
        {
        }

CMidiPlayer::~CMidiPlayer()
        {
        delete iMidiUtility;
        }

CMidiPlayer* CMidiPlayer::NewLC()
        {
        CMidiPlayer* self = new (ELeave) CMidiPlayer();
        CleanupStack::PushL(self);
        self->ConstructL();
        return self;
        }

CMidiPlayer* CMidiPlayer::NewL()
        {
        CMidiPlayer* self = CMidiPlayer::NewLC();
        CleanupStack::Pop(self);
        return self;
        }

void CMidiPlayer::ConstructL()
        {
        iMidiUtility = CMidiClientUtility::NewL(*this);
        }

void CMidiPlayer::Play(const TDesC& aFileName)
        {
        iMidiUtility->Close();
        iMidiUtility->OpenFile(aFileName);
        }

void CMidiPlayer::Stop()
        {
        iMidiUtility->Stop(TTimeIntervalMicroSeconds(0));
        iMidiUtility->Close();
        }

void CMidiPlayer::MmcuoStateChanged(TMidiState aOldState, TMidiState aNewState,
                        const TTimeIntervalMicroSeconds& /*aTime*/, TInt aError)
        {
        if (KErrNone == aError)
                {               
            if (EMidiStateOpenDisengaged == aNewState)
                        {
                        // Set the volume to half of the maximum volume.
                        TRAP_IGNORE(iMidiUtility->SetVolumeL(
                                        iMidiUtility->MaxVolumeL() / KVolumeDenominator));
                        
                        // Play the MIDI file.
                        iMidiUtility->Play();
                        }
                }
        else
                {
                DisplayErrorMessage(aError);
                }
        }

void CMidiPlayer::MmcuoTempoChanged(TInt /*aMicroBeatsPerMinute*/)
        {
        }

void CMidiPlayer::MmcuoVolumeChanged(TInt /*aChannel*/,
                TReal32 /*aVolumeInDecibels*/)
        {
        }

void CMidiPlayer::MmcuoMuteChanged(TInt /*aChannel*/, TBool /*aMuted*/)
        {
        }

void CMidiPlayer::MmcuoSyncUpdate(const TTimeIntervalMicroSeconds& /*aMicroSeconds*/,
                        TInt64 /*aMicroBeats*/)
        {
        }

void CMidiPlayer::MmcuoMetaDataEntryFound(const TInt /*aMetaDataEntryId*/,
                        const TTimeIntervalMicroSeconds& /*aPosition*/)
        {
        }

void CMidiPlayer::MmcuoMipMessageReceived(
                const RArray<TMipMessageEntry>& /*aMessage*/)
        {
        }

void CMidiPlayer::MmcuoPolyphonyChanged(TInt /*aNewPolyphony*/)
        {
        }

void CMidiPlayer::MmcuoInstrumentChanged(TInt /*aChannel*/, TInt /*aBankId*/,
                        TInt /*aInstrumentId*/)
        {
        }

void CMidiPlayer::DisplayErrorMessage(TInt aError)
        {
        const TInt KMaxBuffer = 15;
        _LIT(KErrorMessage, "Error: %d");
        TBuf<KMaxBuffer> buffer;
        buffer.AppendFormat(KErrorMessage, aError);
        TRAP_IGNORE(CEikonEnv::Static()->InfoWinL(KNullDesC, buffer));
        }

// End of File

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