C++ MidiEvent::isNoteOn方法代码示例

void mainloopalgorithms(void) {
   eventBuffer.checkPoll();

   while (synth.getNoteCount() > 0) {
      message = synth.extractNote();
      if (message.isNoteOn() && message.getP1() == A0) {
         direction = -direction;
         cout << "Direction = " << direction << endl;
      } else if (message.isNoteOn() && message.getP1() == C7) {
         // add one to the length of the tumble sequence
         length = limit(length+1, 2, 200);
         cout << "Sequence length = " << length << endl;
      } else if (message.isNoteOn() && message.getP1() == B6) {
         // subtract one from the length of the tumble sequence
         length = limit(length-1, 2, 200);
         cout << "Sequence length = " << length << endl;
      } else {
         processNote(message, length, direction);
      }
   }
}

void MidiSession::read()
{
    while(active)
    {
        auto available = Pm_Poll(midiStream);
        
        if(available)
        {
            numEvents = Pm_Read(midiStream, events, 1);
            buffer.events.resize(numEvents);
            
            for(auto i = 0; i < numEvents; i++)
            {
                write(&events[i]);
                MidiEvent event;
                event.status = Pm_MessageStatus(events[i].message);
                event.note = Pm_MessageData1(events[i].message);
                event.velocity = Pm_MessageData2(events[i].message);
                event.timeStamp = events[i].timestamp;
                
                if(event.isNoteOff())
                {
                    event.channel = event.status - 127;
                }
                
                if(event.isNoteOn())
                    event.channel = event.status - 143;
                
                if (event.isPolyAftertouch())
                    event.channel = event.status = 159;
                
                buffer.events[i] = event;
            }
            
            for(auto& listener: listeners)
                listener->addBuffer(buffer);
        }
    }
}

void processNote(MidiEvent message, int seqLength, int direction) {
   static Array<char>         notes;
   static Array<char>         velocities;
   static Array<int>          durations;
   static Array<int>          iois;
   static Array<int>          ontimes;
   static CircularBuffer<int> attacktimes;
   static int                 init = 0;
   static TumbleParameters    temparam;
   char vel;

   if (!init) {
      attacktimes.setSize(256);
      attacktimes.reset();
      notes.setSize(0);
      velocities.setSize(0);
      durations.setSize(0);
      iois.setSize(0);
      ontimes.setSize(128);
      ontimes.zero();
      init = 1;
   }

   char note;
   int deltatime;
   int ioi0;
   int ioix;
   if (message.isNoteOn()) {
      attacktimes.insert(message.tick);

      // check to see if the ioi is in the correct range
      if (notes.getSize() == 0) {
         // no notes yet, so don't know the first ioi
      } else {
         deltatime = attacktimes[0] - attacktimes[1];
         iois.append(deltatime);
      }
      if (iois.getSize() > 1) {
         ioi0 = iois[0];
         ioix = iois[iois.getSize()-1];
         if ((ioix < ioi0 * tolerance) || (ioix > ioi0 / tolerance)) {
            goto resettrigger;
         }
      }

      // at this point the note can be added to the sequence
      if (notes.getSize() + 1 >= seqLength) {
         // time to trigger an algorithm
         if (durations.getSize() < notes.getSize()) {
            // if the last note has not yet been turned off, approximate dur.
            deltatime = iois[iois.getSize()-1];
            durations.append(deltatime);
         }

         int i;
         for (i=0; i<seqLength; i++) {
            temparam.v[i] = velocities[i];
            temparam.i[i] = iois[i];
            temparam.d[i] = durations[i];
            temparam.n[i] = notes[i] - notes[0];
         }
         temparam.n[0]    = message.getP1() - notes[0];
         temparam.current = message.getP1();
         temparam.pos     = 1;
         temparam.max     = seqLength;
         temparam.active  = 1;
         
         startAlgorithm(temparam);
         goto resettrigger;
      } else {
         // add the note info to the algorithm pile
         note = message.getP1();
         notes.append(note);
         vel = message.getP2();
         velocities.append(vel);
         attacktimes[message.getP1()] = message.tick;
      }
   } else if (message.isNoteOff()) {
      if (notes.getSize() > 0) {
         if (notes[notes.getSize()-1] == message.getP1()) {
         deltatime = message.tick - ontimes[message.getP1()];
         durations.append(deltatime);
      } else {
         cout << "A funny error ocurred" << endl;
      }
   }

   return;

resettrigger:
   attacktimes.setSize(0);
   notes.setSize(0);
   velocities.setSize(0);
   durations.setSize(0);
   iois.setSize(0);

   if (message.isNoteOn()) {
      note = message.getP1();
      notes.append(note);
      ontimes[message.getP1()] = message.tick;
//.........这里部分代码省略.........

int main(int argc, char** argv) {
   options.setOptions(argc, argv);
   checkOptions(options);

   int status;
   MidiFile midifile;
   if (options.getArgCount()) {
      status = midifile.read(options.getArg(1));
   } else {
      status = midifile.read(cin);
   }
   if (status == 0) {
      cerr << "Error: could not read MIDI file" << endl;
      exit(1);
   }

   int tpq = midifile.getTicksPerQuarterNote();
   midifile.linkNotePairs();
   if (joinQ) {
      midifile.joinTracks();
   }
   MidiEvent* mev;
   double duration;

   if (secondsQ) {
      midifile.doTimeAnalysis();
   }

   if (secondsQ) {
      cout << "SEC\tDUR\tTRACK\tNOTE\n";
   } else if (quarterQ) {
      cout << "QTRS\tDUR\tTRACK\tNOTE\n";
   } else {
      cout << "TICKS\tDUR\tTRACK\tNOTE\n";
   }
   cout << "============================\n";

   for (int track=0; track < midifile.getTrackCount(); track++) {
      for (int i=0; i<midifile[track].size(); i++) {
         mev = &midifile[track][i];
         if (!mev->isNoteOn()) {
            continue;
         }
         if (secondsQ) {
            duration = mev->getDurationInSeconds();
         } else {
            duration = mev->getTickDuration();
         }

         if (secondsQ) {
            cout << mev->seconds << '\t';
            cout << duration << '\t';
         } else if (quarterQ) {
            cout << mev->tick/tpq << '\t';
            cout << duration/tpq << '\t';
         } else {
            cout << mev->tick << '\t';
            cout << duration << '\t';
         }
         cout << mev->track << '\t';
         cout << mev->getKeyNumber();
         cout << endl;
      }
      if (midifile.getTrackCount() > 1) {
         cout << endl;
      }
   }

   return 0;
}

void PCH_ChartManager::LoadMidiToDB(PCH_CString filePath,PCH_CString fileHash, bool update)
{
    std::ifstream in2(filePath, std::ios::in | std::ios::binary);
    MidiFile midifile(in2);
    if (!midifile.status())
    {
        printf("Error reading MIDI file %s\n",filePath);
        return;
    }

    printf("Loading midi file data...\n");
    if(update)
    {
        printf("Deleting existing data...\n");
        _db->DeleteChart(filePath);
    }

    midifile.absoluteTicks();
    midifile.linkNotePairs();

    midifile.doTimeAnalysis();

    printf("Analysis complete...\n");

    int totalTracks =midifile.size();

    MidiEvent* mev;

    int chartID = _db->AddChart(filePath, fileHash);
    int trackID = 0;
    int trackItemCount = 0;

#ifndef PCH_USE_HEAP
    PCH_ControllerEvent newEvent;
    PCH_ChartInstrument newInst;
    PCH_ChartTrackNote newNote;
    PCH_PitchBend newBend;
#endif

    for (int track=0; track < totalTracks; track++)
    {
        trackItemCount = midifile[track].size();

        if(trackItemCount == 0) continue;

        trackID = _db->AddTrack(chartID,track);
        printf("Track #%d added...\n",trackID);

        _db->BeginTransaction();

        for (int i=0; i<trackItemCount; i++)
        {
            mev = &midifile[track][i];

            if(mev->isTimbre())
            {
#ifdef PCH_USE_HEAP
                PCH_ChartInstrument* newInst = new PCH_ChartInstrument();
                newInst->Channel = mev->getChannel();
                newInst->Seconds = mev->seconds;
                newInst->InstrumentID = mev->getP1();

                _db->AddInstrument(trackID,newInst);

                delete newInst;
                newInst = NULL;
#else
                newInst.Channel = mev->getChannel();
                newInst.Seconds = mev->seconds;
                newInst.InstrumentID = mev->getP1();

                _db->AddInstrument(trackID,&newInst);
#endif
            }

            if(mev->getCommandByte() == 0xFF && mev->getP1() == 0x03)//Title
            {
                printf("Title found\n");
                unsigned char* title = &midifile[track][i][3];//CMD + p1 + p2 are omitted

                int titleSize = mev->getP2();
                if(titleSize > 0)
                {
                    char* strTitle = new char[titleSize+1];

                    memcpy(strTitle,title,titleSize);
                    strTitle[titleSize] = '\0';

                    _db->SetTrackTitle(trackID, strTitle);
                }
                printf("Title end\n");
            }

            if(mev->isNote()) //if(false)
            {
                if(mev->isNoteOn())
                {
#ifdef PCH_USE_HEAP
                    PCH_ChartTrackNote* newNote = new PCH_ChartTrackNote();
                    newNote->Seconds = mev->seconds;
//.........这里部分代码省略.........