C++ MidiMessage::is_note_on方法代码示例

void mainloopalgorithms(void) { 
   if (synth.getNoteCount() > 0) {
      message = synth.extractNote();
      oldnote = checkForSquelch(message, memory, mintime, maxtime, t_time);
      if (!oldnote || sstate == 0) {
         cout << "New note from performer: " << message << endl;
         if (message.is_note_on()) {
            message.p1() += 7;
            outvel = message.p2() + veladd;
            if (outvel > 127) { outvel = 127; }
            synth.send(message.p0(), message.p1(), outvel);
            message.time = t_time;
            message.p2() = outvel;
            memory.insert(message);
         } else if (message.is_note_off()) {
            message.p1() += 7;
            synth.send(message.p0(), message.p1(), message.p2());
            message.time = t_time;
            memory.insert(message);
         }
      } else {
         cout << "Feedback note from piano: " << message << endl;
      }
   }

}

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

   while (synth.getNoteCount() > 0) {
      message = synth.extractNote();
      if (message.is_note_on() && message.p1() == A0) {
         direction = -direction;
         cout << "Direction = " << direction << endl;
      } else if (message.is_note_on() && message.p1() == C7) {
         // add one to the length of the tumble sequence
         length = limit(length+1, 2, 200);
         cout << "Sequence length = " << length << endl;
      } else if (message.is_note_on() && message.p1() == 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 processNote(MidiMessage 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.is_note_on()) {
      attacktimes.insert(message.time);

      // 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.p1() - notes[0];
         temparam.current = message.p1();
         temparam.pos     = 1;
         temparam.max     = seqLength;
         temparam.active  = 1;
         
         startAlgorithm(temparam);
         goto resettrigger;
      } else {
         // add the note info to the algorithm pile
         note = message.p1();
         notes.append(note);
         vel = message.p2();
         velocities.append(vel);
         attacktimes[message.p1()] = message.time;
      }
   } else if (message.is_note_off()) {
      if (notes.getSize() > 0) {
         if (notes[notes.getSize()-1] == message.p1()) {
         deltatime = message.time - ontimes[message.p1()];
         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.is_note_on()) {
      note = message.p1();
      notes.append(note);
      ontimes[message.p1()] = message.time;
//.........这里部分代码省略.........