Problem emitting a signal

[franco.amato]

Hi to all,
in my application (an audio editor) I have a callback that emit a signal when a sound stop playing so:

//! Executed when a sound finish playing
FMOD_RESULT F_CALLBACK endCallback(FMOD_CHANNEL *channel, FMOD_CHANNEL_CALLBACKTYPE type, 
								   unsigned int commanddata1, unsigned int commanddata2)
{
	(void)commanddata1; // Unused (to avoid warnings)
	(void)commanddata2; // Unused (to avoid warnings)
 
	SoundData* currentSound; 
 
	switch(type)
	{
	case FMOD_CHANNEL_CALLBACKTYPE_END:
		{
			FMOD_RESULT result;
			FMOD::Channel *currentChannel = (FMOD::Channel *)channel;
 
			void *ud = NULL;
			result = currentChannel->getUserData( &ud );			
 
			/* inform that sound stopped */
			emit AudioDevice::getInstance()->soundStopped();
			break;
		}
	default:
		break;
	}
 
	return FMOD_OK;
}

//! Executed when a sound finish playing
FMOD_RESULT F_CALLBACK endCallback(FMOD_CHANNEL *channel, FMOD_CHANNEL_CALLBACKTYPE type, 
								   unsigned int commanddata1, unsigned int commanddata2)
{
	(void)commanddata1; // Unused (to avoid warnings)
	(void)commanddata2; // Unused (to avoid warnings)

	SoundData* currentSound; 

	switch(type)
	{
	case FMOD_CHANNEL_CALLBACKTYPE_END:
		{
			FMOD_RESULT result;
			FMOD::Channel *currentChannel = (FMOD::Channel *)channel;

			void *ud = NULL;
			result = currentChannel->getUserData( &ud );			

			/* inform that sound stopped */
			emit AudioDevice::getInstance()->soundStopped();
			break;
		}
	default:
		break;
	}

	return FMOD_OK;
}

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in the application I have 2 WaveWidgets ( waveform display ) having a slot connected to the signal emitted from the callback so:

/************************************************************************/
/* Constructor                                                          */
/************************************************************************/
WaveWidget::WaveWidget( QWidget* parent /* = 0 */ )
 : QWidget( parent ),
   m_wave( 0 ),
   rb( 0 ),
   m_CurrentTimePosition( 0 )
{
	setFocusPolicy( Qt::TabFocus );
	timer = new QTimer();
 
	connect( timer,  SIGNAL( timeout() ), this, SLOT( setCurrentTimePosition() ) );
	connect( AudioDevice::getInstance(), SIGNAL( soundStopped() ), this, SLOT( stopTimer() ), Qt::QueuedConnection );
}

/************************************************************************/
/* Constructor                                                          */
/************************************************************************/
WaveWidget::WaveWidget( QWidget* parent /* = 0 */ )
 : QWidget( parent ),
   m_wave( 0 ),
   rb( 0 ),
   m_CurrentTimePosition( 0 )
{
	setFocusPolicy( Qt::TabFocus );
	timer = new QTimer();

	connect( timer,  SIGNAL( timeout() ), this, SLOT( setCurrentTimePosition() ) );
	connect( AudioDevice::getInstance(), SIGNAL( soundStopped() ), this, SLOT( stopTimer() ), Qt::QueuedConnection );
}

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The stopTimer slot of the WaveWidget reset the timeLine to position 0 so:

/************************************************************************/
/* stopTimer                                                            */  
/************************************************************************/ 
void WaveWidget::stopTimer()
{
	timer->stop();
	qDebug() << "Timer stopped";
	resetTimeline();
}

/************************************************************************/
/* stopTimer                                                            */  
/************************************************************************/ 
void WaveWidget::stopTimer()
{
	timer->stop();
	qDebug() << "Timer stopped";
	resetTimeline();
}

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and

/************************************************************************/
/* resetTimeline                                                        */  
/************************************************************************/ 
void WaveWidget::resetTimeline()
{
	int h = height();
	QRect r = QRect( 0 , 0, m_CurrentTimePosition + 1, h );
	// reset timeline
	update( r );
	// reset current value
	m_CurrentTimePosition = 0;
	// delete rubberband if one
	if( rb )
	{
		delete rb;
		rb = 0;
	}
}

/************************************************************************/
/* resetTimeline                                                        */  
/************************************************************************/ 
void WaveWidget::resetTimeline()
{
	int h = height();
	QRect r = QRect( 0 , 0, m_CurrentTimePosition + 1, h );
	// reset timeline
	update( r );
	// reset current value
	m_CurrentTimePosition = 0;
	// delete rubberband if one
	if( rb )
	{
		delete rb;
		rb = 0;
	}
}

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The problem is that when 1 of the 2 playing sounds stop playing ALL WaveWidget are informed of that and ALL reset their timeLine to 0 instead of only the right WaveWidget that efectively has its sound stopped.
How can I solve this problem?

I hope to get help.
Best Regards,
Franco

[franco.amato]

I solved it calling a method of the "userdata" object instead of emitting a signal so:

//! Executed when a sound finish playing
FMOD_RESULT F_CALLBACK endCallback(FMOD_CHANNEL *channel, FMOD_CHANNEL_CALLBACKTYPE type, 
								   unsigned int commanddata1, unsigned int commanddata2)
{
	(void)commanddata1; // Unused (to avoid warnings)
	(void)commanddata2; // Unused (to avoid warnings)
 
	WaveWidget* wave;
 
	switch(type)
	{
	case FMOD_CHANNEL_CALLBACKTYPE_END:
		{
			FMOD_RESULT result;
			FMOD::Channel *currentChannel = (FMOD::Channel *)channel;
 
			void *ud = NULL;
			result = currentChannel->getUserData( &ud ); // Here I get the userdata
 
			wave = (WaveWidget*)ud; // I cast it
			wave->stopTimer(); // Call userdata method
 
			//emit AudioDevice::getInstance()->soundStopped(); //inform that sound is stopped
			break;
		}
	default:
		break;
	}
 
	return FMOD_OK;
}

//! Executed when a sound finish playing
FMOD_RESULT F_CALLBACK endCallback(FMOD_CHANNEL *channel, FMOD_CHANNEL_CALLBACKTYPE type, 
								   unsigned int commanddata1, unsigned int commanddata2)
{
	(void)commanddata1; // Unused (to avoid warnings)
	(void)commanddata2; // Unused (to avoid warnings)

	WaveWidget* wave;

	switch(type)
	{
	case FMOD_CHANNEL_CALLBACKTYPE_END:
		{
			FMOD_RESULT result;
			FMOD::Channel *currentChannel = (FMOD::Channel *)channel;

			void *ud = NULL;
			result = currentChannel->getUserData( &ud ); // Here I get the userdata

			wave = (WaveWidget*)ud; // I cast it
			wave->stopTimer(); // Call userdata method

			//emit AudioDevice::getInstance()->soundStopped(); //inform that sound is stopped
			break;
		}
	default:
		break;
	}

	return FMOD_OK;
}

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Bye