C++ TrackList::empty方法代码示例

void Song::processNextBuffer()
{
	// if not playing, nothing to do
	if( m_playing == false )
	{
		return;
	}

	TrackList trackList;
	int tcoNum = -1; // track content object number

	// determine the list of tracks to play and the track content object
	// (TCO) number
	switch( m_playMode )
	{
		case Mode_PlaySong:
			trackList = tracks();
			// at song-start we have to reset the LFOs
			if( m_playPos[Mode_PlaySong] == 0 )
			{
				EnvelopeAndLfoParameters::instances()->reset();
			}
			break;

		case Mode_PlayBB:
			if( Engine::getBBTrackContainer()->numOfBBs() > 0 )
			{
				tcoNum = Engine::getBBTrackContainer()->
								currentBB();
				trackList.push_back( BBTrack::findBBTrack(
								tcoNum ) );
			}
			break;

		case Mode_PlayPattern:
			if( m_patternToPlay != NULL )
			{
				tcoNum = m_patternToPlay->getTrack()->
						getTCONum( m_patternToPlay );
				trackList.push_back(
						m_patternToPlay->getTrack() );
			}
			break;

		default:
			return;

	}

	// if we have no tracks to play, nothing to do
	if( trackList.empty() == true )
	{
		return;
	}

	// check for looping-mode and act if necessary
	TimeLineWidget * tl = m_playPos[m_playMode].m_timeLine;
	bool checkLoop =
		tl != NULL && m_exporting == false && tl->loopPointsEnabled();

	if( checkLoop )
	{
		// if looping-mode is enabled and we are outside of the looping
		// range, go to the beginning of the range
		if( m_playPos[m_playMode] < tl->loopBegin() ||
					m_playPos[m_playMode] >= tl->loopEnd() )
		{
			setToTime(tl->loopBegin());
			m_playPos[m_playMode].setTicks(
						tl->loopBegin().getTicks() );
			emit updateSampleTracks();
		}
	}

	f_cnt_t framesPlayed = 0;
	const float framesPerTick = Engine::framesPerTick();

	while( framesPlayed < Engine::mixer()->framesPerPeriod() )
	{
		m_vstSyncController.update();

		float currentFrame = m_playPos[m_playMode].currentFrame();
		// did we play a tick?
		if( currentFrame >= framesPerTick )
		{
			int ticks = m_playPos[m_playMode].getTicks() +
				( int )( currentFrame / framesPerTick );

			m_vstSyncController.setAbsolutePosition( ticks );

			// did we play a whole tact?
			if( ticks >= MidiTime::ticksPerTact() )
			{
				// per default we just continue playing even if
				// there's no more stuff to play
				// (song-play-mode)
				int maxTact = m_playPos[m_playMode].getTact()
									+ 2;

				// then decide whether to go over to next tact
//.........这里部分代码省略.........

bool LOS::importMidi(const QString name, bool merge)/*{{{*/
{
    bool popenFlag;
    FILE* fp = fileOpen(this, name, QString(".mid"), "r", popenFlag);
    if (fp == 0)
        return true;
    MidiFile mf(fp);
    bool rv = mf.read();
    popenFlag ? pclose(fp) : fclose(fp);
    if (rv)
    {
        QString s(tr("reading midifile\n  "));
        s += name;
        s += tr("\nfailed: ");
        s += mf.error();
        QMessageBox::critical(this, QString("LOS"), s);
        return rv;
    }
    //
    //  evaluate song Type (GM, XG, GS, unknown)
    //
    MType t = song->midiType();
    if (!merge)
    {
        t = mf.mtype();
        song->setMType(t);
    }
    MidiInstrument* instr = 0;
    for (iMidiInstrument i = midiInstruments.begin(); i != midiInstruments.end(); ++i)
    {
        MidiInstrument* mi = *i;
        if ((mi->iname() == "GM" && ((t == MT_UNKNOWN) || (t == MIDI_TYPE_GM)))
                || ((mi->iname() == "GS") && (t == MT_GS))
                || ((mi->iname() == "XG") && (t == MT_XG)))
        {
            instr = mi;
            break;
        }
    }
    if (instr == 0)
    {
        // the standard instrument files (GM, GS, XG) must be present
        printf("no instrument, type %d\n", t);
        return true;
        //abort();
    }

    MidiFileTrackList* etl = mf.trackList();
    int division = mf.division();

    //
    // create MidiTrack and copy events to ->events()
    //    - combine note on/off events
    //    - calculate tick value for internal resolution
    //
    int mPort = getFreeMidiPort();
    for (iMidiFileTrack t = etl->begin(); t != etl->end(); ++t)
    {
        MPEventList* el = &((*t)->events);
        if (el->empty())
            continue;
        //
        // if we split the track, SYSEX and META events go into
        // the first target track

        bool first = true;
        // somewhat silly and slooow:
        QList<QPair<int, int> > eventChannelList;
        if(mPort >= 0 && mPort < kMaxMidiPorts)
        {
            for (int channel = 0; channel < kMaxMidiChannels; ++channel)
            {
                //
                // check if there are any events for port/channel in track:
                //
                iMPEvent i;
                for (i = el->begin(); i != el->end(); ++i)
                {
                    MidiPlayEvent ev = *i;
                    if (ev.type() != ME_SYSEX && ev.type() != ME_META && ev.channel() == channel)
                        break;
                }
                if (i == el->end())
                    continue;
                MidiTrack* track = new MidiTrack();
                track->setDefaultName();
                track->setMasterFlag(true);

                track->setOutChannel(channel);
                track->setOutPort(mPort);

                MidiPort* mport = &midiPorts[track->outPort()];
                // this overwrites any instrument set for this port:
                mport->setInstrument(instr);

                EventList* mel = track->events();
                buildMidiEventList(mel, el, track, division, first, false, false);

                first = false;

//.........这里部分代码省略.........

bool LOS::importMidi(const QString name, bool merge)/*{{{*/
{
    bool popenFlag;
    FILE* fp = fileOpen(this, name, QString(".mid"), "r", popenFlag);
    if (fp == 0)
        return true;
    MidiFile mf(fp);
    bool rv = mf.read();
    popenFlag ? pclose(fp) : fclose(fp);
    if (rv)
    {
        QString s(tr("reading midifile\n  "));
        s += name;
        s += tr("\nfailed: ");
        s += mf.error();
        QMessageBox::critical(this, QString("LOS"), s);
        return rv;
    }
    //
    //  evaluate song Type (GM, XG, GS, unknown)
    //
    MType t = song->mtype();
    if (!merge)
    {
        t = mf.mtype();
        song->setMType(t);
    }
    MidiInstrument* instr = 0;
    for (iMidiInstrument i = midiInstruments.begin(); i != midiInstruments.end(); ++i)
    {
        MidiInstrument* mi = *i;
        if ((mi->iname() == "GM" && ((t == MT_UNKNOWN) || (t == MT_GM)))
                || ((mi->iname() == "GS") && (t == MT_GS))
                || ((mi->iname() == "XG") && (t == MT_XG)))
        {
            instr = mi;
            break;
        }
    }
    if (instr == 0)
    {
        // the standard instrument files (GM, GS, XG) must be present
        printf("no instrument, type %d\n", t);
        return true;
        //abort();
    }

    MidiFileTrackList* etl = mf.trackList();
    int division = mf.division();

    //
    // create MidiTrack and copy events to ->events()
    //    - combine note on/off events
    //    - calculate tick value for internal resolution
    //
    int mPort = getFreeMidiPort();
    for (iMidiFileTrack t = etl->begin(); t != etl->end(); ++t)
    {
        MPEventList* el = &((*t)->events);
        if (el->empty())
            continue;
        //
        // if we split the track, SYSEX and META events go into
        // the first target track

        bool first = true;
        QList<QPair<int, int> > portChannelList;
        iMPEvent i;
        for(i = el->begin(); i != el->end(); i++)
        {
            if (i->type() != ME_SYSEX && i->type() != ME_META)
            {
                int chan = i->channel();
                int port = i->port();
                if(portChannelList.isEmpty() || !portChannelList.contains(qMakePair(chan, port)))
                {
                    portChannelList.append(qMakePair(chan, port));

                    MidiTrack* track = new MidiTrack();
                    track->setDefaultName();
                    track->setMasterFlag(true);

                    if(config.partColorNames[lastTrackPartColorIndex].contains("menu:", Qt::CaseSensitive))
                        lastTrackPartColorIndex ++;

                    track->setDefaultPartColor(lastTrackPartColorIndex);
                    lastTrackPartColorIndex ++;

                    if(lastTrackPartColorIndex == NUM_PARTCOLORS)
                        lastTrackPartColorIndex = 1;

                    //Set track channel so buildMidiEventList can match the event to a channel
                    track->setOutChannel(chan);
                    track->setOutPort(mPort);

                    MidiPort* mport = &midiPorts[track->outPort()];
                    // this overwrites any instrument set for this port:
                    mport->setInstrument(instr);

                    EventList* mel = track->events();
//.........这里部分代码省略.........