C++ MidiMessage::p0方法代码示例

void processNote(MidiMessage& message) {
   int velocity = message.p2();
   int key = message.p1();
   int channel = message.p0() & 0x0f;
   int state = 1;
   int duration = 0;
   if (((message.p0() & 0xf0) == 0x80) || velocity == 0) {
      state = 0;
   }

   if (key == A0) {
      cout << "A0 Triggered" << endl;
      for (int i=0; i<decaystates.getSize(); i++) {
         decaystates[i] *= -1.0;
      }
      return;
   }

   if (state == 1) {
      notestates[key] = message.time;
      onvels[key] = velocity;
   } else {
      if (notestates[key] == 0) {
         // do nothing
      } else {
         duration = message.time - notestates[key];
         if (decaystates[key] == 0.0) {
            createDecay(channel, key, duration, onvels[key]);
         }
      }
      notestates[key] = 0;
   }
}

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 sendData(MidiMessage& m, MidiOutPort& output,
              MidiInput& input) {
    int count = m.getParameterCount();
    if (count >= 0 && count <= 2) {
        if (count >= 0) output.rawsend(m.p0());
        if (count >= 1) output.rawsend(m.p0(), m.p1());
        if (count >= 2) output.rawsend(m.p0(), m.p1(), m.p2());
    }
}

int main(void) {
   MidiInput midiin;
   MidiOutput midiout;
   midiout.setPort(0);
   midiout.open();
   midiin.setPort(0);
   midiin.open();

   MidiMessage message;
   int sysexloc;
   unsigned char *sysexdata = NULL;
   int sysexsize = 0;
   int i;
   int running = 1;
   cout << "sysexio -- display and echo SYSEX messages from MIDI input" << endl;
   cout << "Press Middle C to quit." << endl;
   while (running) {
      if (midiin.getCount() > 0) {
         message = midiin.extract();
         if (message.p0() == 0xf0) {
            sysexloc = message.p1();
            sysexdata = midiin.getSysex(sysexloc);
            sysexsize = midiin.getSysexSize(sysexloc);

            // print out the sysex data to the screen:
            for (i=0; i<sysexsize; i++) {
               cout << hex << (int)sysexdata[i] << " ";
               if ((i + 1) % 30 == 0) {
                  cout << endl;
               }
            }
            cout << endl;

            // Now echo the messages to MIDI output (as a demo
            // for how to send Sysex outputs)
            midiout.rawsend(sysexdata, sysexsize);

            // As a courtesy, mark the midiin sysex buffer free
            // but this is not necessay (it will be erased when
            // more space is needed for storing a sysex.
            midiin.clearSysex(sysexloc);
            
         } else if ((message.p0() & 0xf0) == 0x90) {
            // Exit the program when a middle C note is pressed.
            if (message.p1() == 60 && message.p2() > 0) {
               running = 0;
            }
         }
      }
   }

   return 0;
}

void sillyKeyboard(int key, int chan /* = 0 */) {
   static int octave = 4;
   static int newkey = 0;
   static Voice voice;
   static MidiMessage message;

   // check to see if adjusting the octave:
   if (isdigit(key)) {
      octave = key - '0';
      return;
   }

   switch (key) {
      case 'z':  newkey = 12 * octave + 0;   break;   // C
      case 's':  newkey = 12 * octave + 1;   break;   // C#
      case 'x':  newkey = 12 * octave + 2;   break;   // D
      case 'd':  newkey = 12 * octave + 3;   break;   // D#
      case 'c':  newkey = 12 * octave + 4;   break;   // E
      case 'v':  newkey = 12 * octave + 5;   break;   // F
      case 'g':  newkey = 12 * octave + 6;   break;   // F#
      case 'b':  newkey = 12 * octave + 7;   break;   // G
      case 'h':  newkey = 12 * octave + 8;   break;   // G#
      case 'n':  newkey = 12 * octave + 9;   break;   // A
      case 'j':  newkey = 12 * octave + 10;  break;   // A#
      case 'm':  newkey = 12 * octave + 11;  break;   // B
      case ',':  newkey = 12 * octave + 12;  break;   // C
      case 'l':  newkey = 12 * octave + 12;  break;   // C#
      case '.':  newkey = 12 * octave + 12;  break;   // D
      case '\'': newkey = 12 * octave + 12;  break;   // D#
      case '/':  newkey = 12 * octave + 12;  break;   // E
      default: return;         // don't do anything if not a key
   }

   newkey = limit(newkey, 0, 127);

   // put note-off message in synth's input buffer:
   message.time = t_time;
   message.p0() = 0x90 | voice.getChan();
   message.p1() = voice.getKey();
   message.p2() = 0;
   synth.insert(message);

   // turn off the last note:
   voice.off();

   // set parameters for next note-on:
   voice.setChan(chan & 0x0f);      // limit channel to range from 0 to 15
   voice.setVel(rand() % 127 +1);   // random attack in range from 1 to 127
   voice.setKey(newkey);            // use the newly selected key number

   // play the MIDI note:
   voice.play();

   // insert the played note into synth's input MIDI buffer:
   message.command() = 0x90 | voice.getChan();
   message.p1() = voice.getKey();
   message.p2() = voice.getVel();
   synth.insert(message);

}

void processMidiCommand(MidiMessage& message) {
   if (message.p0() != 0x90 || message.p2() == 0) {
      return;
   }

   switch (message.p1()) {
      case 60:                     // Middle C = beat
         keyboardchar(' ');
         break;
      case 61:                     // C# = amplitude control
         {
         double amp = performance.getAmp();
         amp = amp * message.p2() / 64;
         if (amp < 0) {
            amp = 0;
         } else if (amp > 127) {
            amp = 127;
         }
         performance.setAmp((int)amp);
         }
         break;
      case 71:                      // B  = 1 beat tempo follow
         keyboardchar('1');
         break;
      case 72:                      // C  = 2 beat tempo follow
         keyboardchar('2');
         break;
      case 73:                      // C# = 3 beat tempo follow
         keyboardchar('3');
         break;
      case 74:                      // D  = 4 beat tempo follow
         keyboardchar('4');
         break;
      case 79:                      // G  = constant tempo follow
         keyboardchar('9');
         break;
      case 80:                      // G# = automatic
         keyboardchar('0');
         break;
      case 62:                      // amplitude decrease
         keyboardchar('[');
         break;
      case 63:                      // amplitude increase
         keyboardchar(']');
         break;
      case 64:                      // tempo decrease
         keyboardchar('-');
         break;
      case 65:                      // tempo increase
         keyboardchar('=');
         break;
   }

}

void mainloopalgorithms(void) { 
   eventBuffer.checkPoll();        // see if any notes to play

   while (synth.getNoteCount() > 0) {
      message = synth.extractNote();
      if (message.p2() != 0) {
         lastnotes.insert(message.p1());
         lasttimes.insert(message.time);
         distancee = lastnotes[0] - lastnotes[1];
         duration = lasttimes[0] - lasttimes[1];
         channel = 0x0f & message.p0();
         if (distancee != 0) {
            playgliss(message.p1(), message.p2(), channel,  duration, distancee);
         }
      }
   }
}

void processKeyboard(void) {
   MidiMessage message;
   int key;
   int vel;
   int command;
   
   while (synth.getNoteCount() > 0) {
      message = synth.extractNote();
      command = message.p0();
      key = message.p1();
      vel = message.p2();
 
      if (vel == 0 || (command & 0xf0 == 0x80)) {
         // note-off command section
         long duration = t_time - performerNotes[key];
         durations.insert(duration);
         durtimes.insert(t_time);

         performerNotes[key] = 0;
         performerPC[key%12]--;
         if (performerPC[key%12] < 0) {
            performerPC[key%12] = 0;
         }
      
      } else {   // note-on command
         performerNotes[key] = t_time;
         performerPC[key%12]++;
         performerPCHistory[key%12]++;
         keys.insert(key);
         keytimes.insert(t_time);
         volumes.insert(vel);
         voltimes.insert(t_time);

      } // end of the note-on command section

   }  // end of the while loop for processing notes from the performer

   // update the time that the performer last play a note on/off:
   lastPerformerTime = t_time;

   updatePerformRegions();
   updateDuration();
   updateVolume();
}

int checkForSquelch(MidiMessage& message, CircularBuffer<MidiMessage>& memory, 
      int mintime, int maxtime, int curtime) {
   int i;
   if (memory.getSize() == 0) {
      return 0;
   }

   for (i=0; i<memory.getSize(); i++) {
      if ((curtime - (int)memory[i].time) < mintime) {
         continue;
      }
      if ((curtime - (int)memory[i].time) > maxtime) {
         break;
      }
      if ((memory[i].p0() == message.p0()) && (memory[i].p1() == message.p1())) {
         return 1;
      }
   }

   return 0;
}

void initialization(void) { 
   batonTimer.setPeriod(50);           // time to get new state of baton
   offTimer.setPeriod(200);            // time to check buffer for forgetting
   controlDisplayTimer.setPeriod(200); // time to check buffer for forgetting

   // set the voice channels all to be 0 for the disklavier and so
   // the channels do not have to be specified when playing the note.
   for (int i=0; i<MAXVOICES; i++) {
      voice[i].setChannel(0);
   }
   computer.setChannel(0);
   computerMessage.time = t_time;
   computerMessage.p0() = 0x90;
   computerMessage.p1() = 0;
   computerMessage.p2() = 0;

   keys.setSize(1000);        // store keys for memory of previous notes
   keytimes.setSize(1000);    // note times for keys buffer
   volumes.setSize(1000);     // duration of notes being held by performer
   voltimes.setSize(1000);    // duration of notes being held by performer
   durations.setSize(1000);   // duration of notes being held by performer
   durtimes.setSize(1000);    // duration of notes being held by performer
}

void keyboardchar(int key) { 
   if (isdigit(key)) {
      int mkey = 5 * 12 + key - '0';
      int mvel = (int)(drand48() * 40 + 40);
       
      //turn off old note from computer's point of view
      computerMessage.time = t_time;
      computerMessage.p2() = 0;
      synth.insert(computerMessage);

      cout << "played note: " << mkey << " with velocity: " << mvel << endl;
      computer.play(mkey, mvel);

      computerMessage.time = t_time;
      computerMessage.p0() = 0x90;           // midi note-on command, channel 1
      computerMessage.p1() = mkey;
      computerMessage.p2() = mvel;
      synth.insert(computerMessage);
      cout << "played note: " << mkey << " with velocity: " << mvel << endl;

      return;
   }

   switch (key) {
      case ' ':           // turn output notes on/off
         activeQ = !activeQ;
         if (activeQ) {
            cout << "Program Activated" << endl;
         } else {
            cout << "Program Deactivated" << endl;
         }
         break;

      case 'c':           // toggle baton control display
         controlDisplayQ = !controlDisplayQ;
         if (controlDisplayQ == 0) {
            cout << endl;
         }
         break;
         
      case 'd':           // display baton's output notes
         displayOutput = !displayOutput;
         if (displayOutput) {
            cout << "Baton output notes display turned ON" << endl;
         } else {
            cout << "Baton output notes display turned OFF" << endl;
         }
         break;

      case 'n':           // display performerPCHistory pitches
         {
         cout << "Piano notes: ";
         for (int i=0; i<11; i++) {
            cout << performerPCHistory[i] << ", ";
         }
         cout << performerPCHistory[11] << endl;
         }
         break;

      case 'm':           // display performerPC pitches
         {
         cout << "Notes on:    ";
         for (int i=0; i<11; i++) {
            cout << performerPC[i] << ", ";
         }
         cout << performerPC[11] << endl;
         }
         break;

      case 'r':           // display the register information
         {
         cout << "Register: "
              << performerRegion[0]
              << performerRegion[1]
              << performerRegion[2]
              << endl;
         }
         break;

      case 'v':           // display the active voice count for baton
         {
         cout << endl << "Active voices = " << countActiveVoices();
         cout << ": ";
         for (int z=0; z<MAXVOICES; z++) {
            if (voiceState[z]) {
               cout << " " << (int)voice[z].getKey();
            } else {
               cout << "  0";
            }
         }
         cout << endl;
         }
         break;

      case 'z':           // forget the current piano's key history
         {
         for (int z=0; z<12; z++) { 
            performerPCHistory[z] = 0;
         }
         keys.reset();
//.........这里部分代码省略.........

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

   displayHeader(cout);
   if (fileQ) {
      displayHeader(outputfile);
   }

   KeyboardInput keyboard;     // for typing comments into output file
   char keych;                 // character from keyboard
   MidiMessage message;
   int lastTime = -1;

   midi.open();
   while (1) {
      while (midi.getCount() > 0) {
         message = midi.extract();
         if (echoQ) {
            midi.send(message);
         }

         if ((!activeSensingQ) && (message.p0() == 0xfe)) {
            // don't display incoming active-sensing messages
            continue;
         }

         // filter any specified message types
         if (suppressOffQ && ((message.p0() & 0xf0) == 0x90) &&
               (message.p2() == 0)) {      
            continue;
         } else if (filter[(message.p0() >> 4) - 8]) {
            continue;
         } else if (cfilter[message.p0() & 0x0f]) {
            continue;
         }

         // adjust message time to delta time if necessary
         if (!absoluteQ) {
            if (lastTime == -1) {
               lastTime = message.time;
               message.time = 0;
            } else {
               int temp = message.time;
               message.time = message.time - lastTime;
               lastTime = temp;
            }
         }

         displayMessage(cout, message, style);
         if (fileQ) {
            displayMessage(outputfile, message, style);
         }
      }

      if (keyboardQ && keyboard.hit()) {
         keych = keyboard.getch();
         switch (keych) {
            case 27:                   // escape key 
               if (fileQ && bufferIndex != 0 && bufferIndex < MAX_KEY_BUFF) {
                  inputBuffer[bufferIndex] = '\0';
                  outputfile << inputBuffer;
               }
               keyboard.deinitialize();
               exit(0);      
               break;
            case 0x08:                 // backspace key
            case 0x7f:                 // delete key
               if (bufferIndex > 0) {
                  cout << "\b \b" << flush;
                  bufferIndex--;
               }
               break;
            case 0x0a:                 // enter key only
               #ifdef VISUAL
                  break;
               #endif
            case 13:                   // line feed
               cout << endl;
               if (bufferIndex < MAX_KEY_BUFF) {
                  inputBuffer[bufferIndex] = '\0';
                  if (fileQ) {
                     outputfile << inputBuffer << '\n';
                  }
                  examineInputForCommand(inputBuffer);
               }
               bufferIndex = 0;
               break;
            case 0x0c:                 // ^L key (redraw input)
               cout << endl;
               if (bufferIndex < MAX_KEY_BUFF) {
                  inputBuffer[bufferIndex] = '\0';
                  cout << inputBuffer << flush;
               }
               break;
            default:                   // normal key
               cout << keych << flush;
               if (bufferIndex < MAX_KEY_BUFF) {
                  inputBuffer[bufferIndex++] = keych;
               } else { 
//.........这里部分代码省略.........

void mainloopalgorithms(void) { 
   if (comparestate && notetimer.expired()) {
      if (notetimer.expired() > 2) {
         notetimer.reset();
      } else {
         notetimer.update();
      }

      notestate = !notestate;
      if (notestate == 1 || notestate == -1) {
         synth.play(0, note, 64);
         data = 0x90; sentout.insert(data);
         data = note; sentout.insert(data);
         data = 64;   sentout.insert(data);
      } else {
         synth.play(0, note, 0);
         data = 0x90; sentout.insert(data);
         data = note; sentout.insert(data);
         data = 0;    sentout.insert(data);
         note += step * direction;
         if (note > highestnote) {
            note = lowestnote;
         }
         if (note < lowestnote) {
            note = highestnote;
         }
      }
   }

   if (midiinput.getCount() > 0) {
      message = midiinput.extract();
      receivedin.insert(message.p0());
      receivedin.insert(message.p1());
      receivedin.insert(message.p2());

      // check that the messages are identical
      if (receivedin.getCount() < 3) {
         cout << "Error: not enough received data" << endl;
      } else {
         checkin[0] = receivedin.extract();
         checkin[1] = receivedin.extract();
         checkin[2] = receivedin.extract();
      }

      if (sentout.getCount() < 3) {
         cout << "Error: not enough sent data" << endl;
      } else {
         checkout[0] = sentout.extract();
         checkout[1] = sentout.extract();
         checkout[2] = sentout.extract();
      }

      if ((checkout[0] != checkin[0]) || (checkout[1] != checkin[1]) ||
          (checkout[2] != checkin[2])) {
         synth.rawsend(0xaa, 0x7f, 0x00);
         cout << "Error " 
              << "output was = (" << hex << (int)checkout[0] << ") "
              << dec << (int)checkout[1] << " "
              << dec << (int)checkout[2] << "\tbut input is = ("
              << hex << (int)checkin[0] << ") "
              << dec << (int)checkin[1] << " "
              << dec << (int)checkin[2] << " "
              << endl;

         // assume that a note message was missed.
         if (sentout.getCount() < 3) {
            cout << "Error: not enough sent data during error" << endl;
         } else {
            checkout[0] = sentout.extract();
            checkout[1] = sentout.extract();
            checkout[2] = sentout.extract();
         }

         stop();  
         cout << "Press space to restart testing, "
                 "or press 'S' to silence synth" << endl;
      }

   }
 
}