C++ MidiEvent::param方法代码示例

void MidiWinMM::processOutEvent( const MidiEvent& event, const MidiTime& time, const MidiPort* port )
{
	const DWORD shortMsg = ( event.type() + event.channel() ) +
				( ( event.param( 0 ) & 0xff ) << 8 ) +
				( ( event.param( 1 ) & 0xff ) << 16 );

	QStringList outDevs;
	for( SubMap::ConstIterator it = m_outputSubs.begin(); it != m_outputSubs.end(); ++it )
	{
		for( MidiPortList::ConstIterator jt = it.value().begin(); jt != it.value().end(); ++jt )
		{
			if( *jt == port )
			{
				outDevs += it.key();
				break;
			}
		}
	}

	for( QMap<HMIDIOUT, QString>::Iterator it = m_outputDevices.begin(); it != m_outputDevices.end(); ++it )
	{
		if( outDevs.contains( *it ) )
		{
			midiOutShortMsg( it.key(), shortMsg );
		}
	}
}

MIDIPacketList MidiApple::createMidiPacketList( const MidiEvent& event )
{
	MIDIPacketList packetList;
	packetList.numPackets = 1;
	MIDIPacket* firstPacket = &packetList.packet[0];
	firstPacket->timeStamp = 0; // send immediately
	firstPacket->length = 3;
	firstPacket->data[0] = ( event.type() + event.channel() );
	firstPacket->data[1] = ( event.param( 0 ) & 0xff );
	firstPacket->data[2] = ( event.param( 1 ) & 0xff );
	return packetList;
}

void RemotePlugin::processMidiEvent( const MidiEvent & _e,
							const f_cnt_t _offset )
{
	message m( IdMidiEvent );
	m.addInt( _e.type() );
	m.addInt( _e.channel() );
	m.addInt( _e.param( 0 ) );
	m.addInt( _e.param( 1 ) );
	m.addInt( _offset );
	lock();
	sendMessage( m );
	unlock();
}

void MidiAlsaSeq::processOutEvent( const MidiEvent& event, const MidiTime& time, const MidiPort* port )
{
	// HACK!!! - need a better solution which isn't that easy since we
	// cannot store const-ptrs in our map because we need to call non-const
	// methods of MIDI-port - it's a mess...
	MidiPort* p = const_cast<MidiPort *>( port );

	snd_seq_event_t ev;
	snd_seq_ev_clear( &ev );
	snd_seq_ev_set_source( &ev, ( m_portIDs[p][1] != -1 ) ?
					m_portIDs[p][1] : m_portIDs[p][0] );
	snd_seq_ev_set_subs( &ev );
	snd_seq_ev_schedule_tick( &ev, m_queueID, 1, static_cast<int>( time ) );
	ev.queue =  m_queueID;
	switch( event.type() )
	{
		case MidiNoteOn:
			snd_seq_ev_set_noteon( &ev,
						event.channel(),
						event.key() + KeysPerOctave,
						event.velocity() );
			break;

		case MidiNoteOff:
			snd_seq_ev_set_noteoff( &ev,
						event.channel(),
						event.key() + KeysPerOctave,
						event.velocity() );
			break;

		case MidiKeyPressure:
			snd_seq_ev_set_keypress( &ev,
						event.channel(),
						event.key() + KeysPerOctave,
						event.velocity() );
			break;

		case MidiControlChange:
			snd_seq_ev_set_controller( &ev,
						event.channel(),
						event.controllerNumber(),
						event.controllerValue() );
			break;

		case MidiProgramChange:
			snd_seq_ev_set_pgmchange( &ev,
						event.channel(),
						event.program() );
			break;

		case MidiChannelPressure:
			snd_seq_ev_set_chanpress( &ev,
						event.channel(),
						event.channelPressure() );
			break;

		case MidiPitchBend:
			snd_seq_ev_set_pitchbend( &ev,
						event.channel(),
						event.param( 0 ) - 8192 );
			break;

		default:
			qWarning( "MidiAlsaSeq: unhandled output event %d\n", (int) event.type() );
			return;
	}

	m_seqMutex.lock();
	snd_seq_event_output( m_seqHandle, &ev );
	snd_seq_drain_output( m_seqHandle );
	m_seqMutex.unlock();

}