C++ FxMixer::prepareMasterMix方法代码示例

const surroundSampleFrame * Mixer::renderNextBuffer()
{
	m_profiler.startPeriod();

	static Song::PlayPos last_metro_pos = -1;

	Song *song = Engine::getSong();

	Song::PlayModes currentPlayMode = song->playMode();
	Song::PlayPos p = song->getPlayPos( currentPlayMode );

	bool playModeSupportsMetronome = currentPlayMode == Song::Mode_PlayPattern ||
					 currentPlayMode == Song::Mode_PlaySong ||
					 currentPlayMode == Song::Mode_PlayBB;

	if( playModeSupportsMetronome && m_metronomeActive && !song->isExporting() &&
		p != last_metro_pos )
	{
		tick_t ticksPerTact = MidiTime::ticksPerTact();
		if ( p.getTicks() % (ticksPerTact / 1 ) == 0 )
		{
			addPlayHandle( new SamplePlayHandle( "misc/metronome02.ogg" ) );
		}
		else if ( p.getTicks() % (ticksPerTact /
			song->getTimeSigModel().getNumerator() ) == 0 )
		{
			addPlayHandle( new SamplePlayHandle( "misc/metronome01.ogg" ) );
		}
		last_metro_pos = p;
	}

	lockInputFrames();

	// swap buffer
	m_inputBufferWrite = ( m_inputBufferWrite + 1 ) % 2;
	m_inputBufferRead =  ( m_inputBufferRead + 1 ) % 2;

	// clear new write buffer
	m_inputBufferFrames[ m_inputBufferWrite ] = 0;
	unlockInputFrames();

	// remove all play-handles that have to be deleted and delete
	// them if they still exist...
	// maybe this algorithm could be optimized...
	lockPlayHandleRemoval();
	ConstPlayHandleList::Iterator it_rem = m_playHandlesToRemove.begin();
	while( it_rem != m_playHandlesToRemove.end() )
	{
		PlayHandleList::Iterator it = qFind( m_playHandles.begin(), m_playHandles.end(), *it_rem );

		if( it != m_playHandles.end() )
		{
			( *it )->audioPort()->removePlayHandle( ( *it ) );
			if( ( *it )->type() == PlayHandle::TypeNotePlayHandle )
			{
				NotePlayHandleManager::release( (NotePlayHandle*) *it );
			}
			else delete *it;
			m_playHandles.erase( it );
		}

		it_rem = m_playHandlesToRemove.erase( it_rem );
	}
	unlockPlayHandleRemoval();

	// now we have to make sure no other thread does anything bad
	// while we're acting...
	lock();

	// rotate buffers
	m_writeBuffer = ( m_writeBuffer + 1 ) % m_poolDepth;
	m_readBuffer = ( m_readBuffer + 1 ) % m_poolDepth;

	m_writeBuf = m_bufferPool[m_writeBuffer];
	m_readBuf = m_bufferPool[m_readBuffer];

	// clear last audio-buffer
	clearAudioBuffer( m_writeBuf, m_framesPerPeriod );

	// prepare master mix (clear internal buffers etc.)
	FxMixer * fxMixer = Engine::fxMixer();
	fxMixer->prepareMasterMix();

	// create play-handles for new notes, samples etc.
	song->processNextBuffer();

	// add all play-handles that have to be added
	m_playHandleMutex.lock();
	m_playHandles += m_newPlayHandles;
	m_newPlayHandles.clear();
	m_playHandleMutex.unlock();

	// STAGE 1: run and render all play handles
	lockPlayHandleRemoval();
	MixerWorkerThread::fillJobQueue<PlayHandleList>( m_playHandles );
	MixerWorkerThread::startAndWaitForJobs();

	// removed all play handles which are done
	for( PlayHandleList::Iterator it = m_playHandles.begin();
						it != m_playHandles.end(); )
//.........这里部分代码省略.........

sampleFrameA * Mixer::renderNextBuffer()
{
	MicroTimer timer;
	static song::playPos last_metro_pos = -1;

	FxMixer * fxm = engine::fxMixer();

	song::playPos p = engine::getSong()->getPlayPos( song::Mode_PlayPattern );
	if( engine::getSong()->playMode() == song::Mode_PlayPattern &&
		engine::getPianoRoll()->isRecording() == true &&
		p != last_metro_pos && p.getTicks() %
					(DefaultTicksPerTact / 4 ) == 0 )
	{
		addPlayHandle( new samplePlayHandle( "misc/metronome01.ogg" ) );
		last_metro_pos = p;
	}

	lockInputFrames();
	// swap buffer
	m_inputBufferWrite = ( m_inputBufferWrite + 1 ) % 2;
	m_inputBufferRead =  ( m_inputBufferRead + 1 ) % 2;
	// clear new write buffer
	m_inputBufferFrames[ m_inputBufferWrite ] = 0;
	unlockInputFrames();


	// now we have to make sure no other thread does anything bad
	// while we're acting...
	lock();

	// remove all play-handles that have to be deleted and delete
	// them if they still exist...
	// maybe this algorithm could be optimized...
	ConstPlayHandleList::Iterator it_rem = m_playHandlesToRemove.begin();
	while( it_rem != m_playHandlesToRemove.end() )
	{
		PlayHandleList::Iterator it = qFind( m_playHandles.begin(),
						m_playHandles.end(), *it_rem );

		if( it != m_playHandles.end() )
		{
			delete *it;
			m_playHandles.erase( it );
		}

		it_rem = m_playHandlesToRemove.erase( it_rem );
	}

	// rotate buffers
	m_writeBuffer = ( m_writeBuffer + 1 ) % m_poolDepth;
	m_readBuffer = ( m_readBuffer + 1 ) % m_poolDepth;

	m_writeBuf = m_bufferPool[m_writeBuffer];
	m_readBuf = m_bufferPool[m_readBuffer];

	// clear last audio-buffer
	clearAudioBuffer( m_writeBuf, m_framesPerPeriod );

	// prepare master mix (clear internal buffers etc.)
	fxm->prepareMasterMix();

	// create play-handles for new notes, samples etc.
	engine::getSong()->processNextBuffer();


	// STAGE 1: run and render all play handles
	MixerWorkerThread::fillJobQueue<PlayHandleList>( m_playHandles );
	MixerWorkerThread::startAndWaitForJobs();

	// removed all play handles which are done
	for( PlayHandleList::Iterator it = m_playHandles.begin();
						it != m_playHandles.end(); )
	{
		if( ( *it )->affinityMatters() &&
			( *it )->affinity() != QThread::currentThread() )
		{
			++it;
			continue;
		}
		if( ( *it )->done() )
		{
			delete *it;
			it = m_playHandles.erase( it );
		}
		else
		{
			++it;
		}
	}


	// STAGE 2: process effects of all instrument- and sampletracks
	MixerWorkerThread::fillJobQueue<QVector<AudioPort *> >( m_audioPorts );
	MixerWorkerThread::startAndWaitForJobs();

	// STAGE 3: do master mix in FX mixer
	fxm->masterMix( m_writeBuf );

	unlock();

//.........这里部分代码省略.........