C++ MidiTrack::events方法代码示例

bool MidiFile::writeTrack(const MidiTrack &t)
      {
      write("MTrk", 4);
      qint64 lenpos = fp->pos();
      writeLong(0);                 // dummy len

      status   = -1;
      int tick = 0;
      for (auto i : t.events()) {
            int ntick = i.first;
            putvl(ntick - tick);    // write tick delta
            //
            // if track channel != -1, then use this
            //    channel for all events in this track
            //
            if (t.outChannel() != -1)
                  writeEvent(i.second);
            tick = ntick;
            }

      //---------------------------------------------------
      //    write "End Of Track" Meta
      //    write Track Len
      //

      putvl(1);
      put(0xff);        // Meta
      put(0x2f);        // EOT
      putvl(0);         // len 0
      qint64 endpos = fp->pos();
      fp->seek(lenpos);
      writeLong(endpos-lenpos-4);   // tracklen
      fp->seek(endpos);
      return false;
      }

std::multimap<ReducedFraction, std::string>
extractLyricsFromTrack(const MidiTrack &lyricsTrack, int division)
      {
      std::multimap<ReducedFraction, std::string> lyrics;

      for (const auto &i: lyricsTrack.events()) {
            const auto& e = i.second;
            if (isLyricEvent(e)) {
                  const uchar* data = (uchar*)e.edata();
                  std::string text = MidiCharset::fromUchar(data);
                  if (isLyricText(text)) {
                        const auto tick = toMuseScoreTicks(i.first, division);
                                    // no charset handling here
                        lyrics.insert({tick, text});
                        }
                  }
            }
      return lyrics;
      }

bool isLyricsTrack(const MidiTrack &lyricsTrack)
      {
      bool lyricsFlag = false;

      for (const auto &i: lyricsTrack.events()) {
            const auto& e = i.second;
            if (isLyricEvent(e)) {
                  const uchar* data = (uchar*)e.edata();
                              // no charset handling here
                  std::string text = MidiCharset::fromUchar(data);
                  if (isLyricText(text)) {
                        if (!lyricsFlag)
                              lyricsFlag = true;
                        }
                  }
            else if (e.type() == ME_NOTE)
                  return false;
            }

      return lyricsFlag;
      }

int main(int argc, char* argv[])
      {
      int c;
      while ((c = getopt(argc, argv, "vdD:r")) != EOF) {
            switch (c) {
                  case 'v':
                        printVersion();
                        return 0;
                  case 'd':
                        debugMode = true;
                        break;
                  default:
                        usage();
                        return -1;
                  }
            }
      QIODevice* in = 0;
      QIODevice* out = 0;

      switch (argc - optind) {
            case 2:
                  out = new QFile(argv[1 + optind]);
                  if (!out->open(QIODevice::WriteOnly)) {
                        printf("cannot open output file <%s>: %s\n", argv[optind+1], strerror(errno));
                        return -3;
                        }
            case 1:
                  in = new QFile(argv[optind]);
                  if (!in->open(QIODevice::ReadOnly)) {
                        printf("cannot open input file <%s>: %s\n", argv[optind], strerror(errno));
                        return -4;
                        }
                  break;
            case 0:
                  break;
            default:
                  usage();
                  return -2;
                  break;
            }
      if (in == 0) {
            in = new QFile;
            ((QFile*)in)->open(stdin, QIODevice::ReadOnly);
            }
      if (out == 0) {
            out = new QFile;
            ((QFile*)out)->open(stdout, QIODevice::WriteOnly);
            }

      MidiFile mf;
      mf.setFormat(1);

      XmlReader e(in);
      while (e.readNextStartElement()) {
            const QStringRef& tag(e.name());
            if (tag == "SMF") {
                  while (e.readNextStartElement()) {
                        const QStringRef& tag(e.name());
                        if (tag == "Track") {
                              MidiTrack* track = new MidiTrack(&mf);
                              while (e.readNextStartElement()) {
                                    const QStringRef& tag(e.name());
                                    if (tag == "NoteOff") {
                                          MidiEventType t = MidiEventType::NOTEOFF;
                                          int tick        = e.intAttribute("tick");
                                          uchar c         = e.intAttribute("c");
                                          uchar a         = e.intAttribute("a", 0, 16);
                                          uchar b         = e.intAttribute("b", 0, 16);
                                          track->events().insert(std::pair<int,MidiEvent>(tick, MidiEvent(t, c, a, b)));
                                          e.skipCurrentElement();
                                          }
                                    else if (tag == "NoteOn") {
                                          MidiEventType t = MidiEventType::NOTEON;
                                          int tick        = e.intAttribute("tick");
                                          uchar c         = e.intAttribute("c");
                                          uchar a         = e.intAttribute("a", 0, 16);
                                          uchar b         = e.intAttribute("b", 0, 16);
                                          track->events().insert(std::pair<int,MidiEvent>(tick, MidiEvent(t, c, a, b)));
                                          e.skipCurrentElement();
                                          }
                                    else if (tag == "Ctrl") {
                                          MidiEventType t = MidiEventType::CONTROLLER;
                                          int tick        = e.intAttribute("tick");
                                          uchar c         = e.intAttribute("c");
                                          uchar a         = e.intAttribute("a", 0, 16);
                                          uchar b         = e.intAttribute("b", 0, 16);
                                          track->events().insert(std::pair<int,MidiEvent>(tick, MidiEvent(t, c, a, b)));
                                          e.skipCurrentElement();
                                          }
                                    else if (tag == "Program") {
                                          MidiEventType t = MidiEventType::PROGRAM;
                                          int tick        = e.intAttribute("tick");
                                          uchar c         = e.intAttribute("c");
                                          uchar a         = e.intAttribute("a", 0, 16);
                                          track->events().insert(std::pair<int,MidiEvent>(tick, MidiEvent(t, c, a, 0)));
                                          e.skipCurrentElement();
                                          }
                                    else if (tag == "Event") {
                                          uchar t         = e.intAttribute("t");
                                          int tick        = e.intAttribute("tick");
//.........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
    //
    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:
        for (int port = 0; port < kMaxMidiPorts; ++port)
        {
            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 && ev.port() == port)
                        break;
                }
                if (i == el->end())
                    continue;
                MidiTrack* track = new MidiTrack();
                if ((*t)->isDrumTrack)
                {
                    track->setType(Track::DRUM);
                }

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

                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);
                // Don't do loops.
                buildMidiEventList(mel, el, track, division, first, false);
//.........这里部分代码省略.........