playeradapter.cpp

一款大砖块的游戏

// Copyright (c) 2001, Nokia Mobile Phones. All rights reserved.

#include <eikmenup.h>

#include "playeradapter.h"

// Identifying string for this audio utility
_LIT(KAudioPlayer, "Player");


CPlayerAdapter::CPlayerAdapter() : 
	iWantToPlay(EFalse),
    iState(ENotReady),
	iVolumeFraction(2)
    {
    }

//CPlayerAdapter* CPlayerAdapter::NewL(const TDesC& aFileName, CSoundAppUi& aAppUi)
CPlayerAdapter* CPlayerAdapter::NewL(const TDesC& aFileName)
    {
    CPlayerAdapter* self = NewLC(aFileName);
    CleanupStack::Pop();  // self
    return self;
    }

CPlayerAdapter* CPlayerAdapter::NewLC(const TDesC& aFileName)
    {
    CPlayerAdapter* self = new (ELeave) CPlayerAdapter();
    CleanupStack::PushL(self);
    self->ConstructL(aFileName);
    return self;
    }


void CPlayerAdapter::ConstructL(const TDesC& aFileName)
{
    // Create an audio player utility instance for playing sample data from a file
    // causes MMdaAudioPlayerCallback::MapcInitComplete to be called
    TRAPD( err, 
        iMdaAudioPlayerUtility = CMdaAudioPlayerUtility::NewFilePlayerL(aFileName, *this, EMdaPriorityMax, EMdaPriorityPreferenceNone)
        );
    if (err != KErrNone)
    {
        iMdaAudioPlayerUtility = NULL;
    }
}

CPlayerAdapter::~CPlayerAdapter()
    {
    delete iMdaAudioPlayerUtility;    
    iMdaAudioPlayerUtility = NULL;
    }


// Note that this implementation of the virtual function does not leave.
void CPlayerAdapter::PlayL()
{
	if(iState == EReadyToPlay)
	{
		iMdaAudioPlayerUtility->Play();
		iState = EPlaying;
	}
	else
	{
		iWantToPlay = ETrue;
	}
}


// Note that this implementation of the virtual function does not leave.
void CPlayerAdapter::StopL()
{
	iWantToPlay = EFalse;
	if (iState == EPlaying)
	{
		iMdaAudioPlayerUtility->Stop();
	    iState = EReadyToPlay;
	}
}


const TDesC& CPlayerAdapter::Identify()
    {
    return KAudioPlayer;
    }

void CPlayerAdapter::SetVolume(TInt aVolume)
{
	if(iState == EReadyToPlay || iState == EPlaying)
	{
		TInt maxVolume;

		/* get the maximum volume which can be played */
		if ( iMdaAudioPlayerUtility )
			maxVolume = iMdaAudioPlayerUtility->MaxVolume();
		else 
			maxVolume = 10;

		/* bound the volume */
		if(aVolume < 0) aVolume = 0;
		if(aVolume > maxVolume) aVolume = maxVolume;

		/* set the volume */
		if ( iMdaAudioPlayerUtility )
			iMdaAudioPlayerUtility->SetVolume(aVolume);
	}
}

void CPlayerAdapter::SetVolumeFraction(TInt aFraction)
{
	iVolumeFraction = aFraction;
	if((iState == EReadyToPlay || iState == EPlaying) && (aFraction > 0))
	{
		TInt maxVolume;
		/* get the maximum volume which can be played */
		if ( iMdaAudioPlayerUtility )
		  maxVolume = iMdaAudioPlayerUtility->MaxVolume();
		else 
		  maxVolume = 10;

		TInt volume = maxVolume / aFraction;

		/* set the volume */
		if ( iMdaAudioPlayerUtility )
		  iMdaAudioPlayerUtility->SetVolume(volume);

	}

}


// from MMdaAudioPlayerCallback
void CPlayerAdapter::MapcInitComplete(TInt aError, const TTimeIntervalMicroSeconds& /*aDuration*/)
{
    iState = aError ? ENotReady : EReadyToPlay;
    /* set an initial volume */
    SetVolume(iMdaAudioPlayerUtility->MaxVolume() / iVolumeFraction);
	if (iWantToPlay && iState == EReadyToPlay)
	{
		// We can't leave here.
		TRAPD(err, PlayL());
	}
}


void CPlayerAdapter::MapcPlayComplete(TInt aError)
{
	if ((aError == KErrNone) || (aError == KErrUnderflow))    // Err -10 == Buffer Underflow
		iState = EReadyToPlay;
	else
		iState = ENotReady;
}