JZZ.js

(function(global, factory) {
  if (typeof exports === 'object' && typeof module !== 'undefined') {
    module.exports = factory();
  }
  else if (typeof define === 'function' && define.amd) {
    define('JZZ', [], factory);
  }
  else {
    if (!global) global = window;
    if (global.JZZ && global.JZZ.MIDI) return;
    global.JZZ = factory();
  }
})(this, function() {

  var _scope = typeof window === 'undefined' ? global : window;
  var _version = '1.1.6';
  var i, j, k, m, n;

  var _time = Date.now || function () { return new Date().getTime(); };
  var _startTime = _time();
  var _now = typeof performance != 'undefined' && performance.now ?
    function() { return performance.now(); } : function() { return _time() - _startTime; };
  var _schedule = function(f) {
    setTimeout(f, 0);
  };

  // _R: common root for all async objects
  function _R() {
    this._orig = this;
    this._ready = false;
    this._queue = [];
    this._log = [];
  }
  _R.prototype._exec = function() {
    while (this._ready && this._queue.length) {
      var x = this._queue.shift();
      x[0].apply(this, x[1]);
    }
  };
  _R.prototype._push = function(func, arg) { this._queue.push([func, arg]); _R.prototype._exec.apply(this); };
  _R.prototype._slip = function(func, arg) { this._queue.unshift([func, arg]); };
  _R.prototype._pause = function() { this._ready = false; };
  _R.prototype._resume = function() { this._ready = true; _R.prototype._exec.apply(this); };
  _R.prototype._break = function(err) { this._orig._bad = true; this._orig._log.push(err || 'Unknown JZZ error'); };
  _R.prototype._repair = function() { this._orig._bad = false; };
  _R.prototype._crash = function(err) { this._break(err); this._resume(); };
  _R.prototype._err = function() { return this._log[this._log.length - 1]; };
  _R.prototype.log = function() { return _clone(this._log); };
  _R.prototype._image = function() {
    var F = function() {}; F.prototype = this._orig;
    var ret = new F();
    ret._ready = false;
    ret._queue = [];
    return ret;
  };
  _R.prototype._thenable = function() {
    var self = this;
    var F = function() {}; F.prototype = self;
    var ret = new F();
    ret.then = function(good, bad) { self._push(_then, [good, bad]); return this; };      
    return ret;
  };
  function _then(good, bad) {
    if (this._bad) {
      if (bad instanceof Function) bad.apply(this, [new Error(this._err())]);
    }
    else {
      if (good instanceof Function) good.apply(this, [this]);
    }
  }
  function _wait(obj, delay) {
    if (this._bad) obj._crash(this._err());
    else setTimeout(function() { obj._resume(); }, delay);
  }
  _R.prototype.wait = function(delay) {
    if (!delay) return this;
    var ret = this._image();
    this._push(_wait, [ret, delay]);
    return ret._thenable();
  };
  function _kick(obj) { if (this._bad) obj._break(this._err()); obj._resume(); }
  function _rechain(self, obj, name) {
    self[name] = function() {
      var arg = arguments;
      var ret = obj._image();
      this._push(_kick, [ret]);
      return ret[name].apply(ret, arg);
    };
  }
  function _and(q) {
    if (!this._bad) {
      if (q instanceof Function) q.apply(this); else console.log(q);
    }
  }
  _R.prototype.and = function(func) { this._push(_and, [func]); return this._thenable(); };
  function _or(q) {
    if (this._bad) {
      if (q instanceof Function) q.apply(this); else console.log(q);
    }
  }
  _R.prototype.or = function(func) { this._push(_or, [func]); return this._thenable(); };

  _R.prototype._info = {};
  _R.prototype.info = function() {
    var info = _clone(this._orig._info);
    if (typeof info.engine == 'undefined') info.engine = 'none';
    if (typeof info.sysex == 'undefined') info.sysex = true;
    return info;
  };
  _R.prototype.name = function() { return this.info().name; };

  function _close(obj) {
    if (this._bad) obj._crash(this._err());
    else {
      this._break('Closed');
      obj._resume();
    }
  }
  _R.prototype.close = function() {
    var ret = new _R();
    if (this._close) this._push(this._close, []);
    this._push(_close, [ret]);
    return ret._thenable();
  };

  function _tryAny(arr) {
    if (!arr.length) {
      this._break();
      return;
    }
    var func = arr.shift();
    if (arr.length) {
      var self = this;
      this._slip(_or, [ function() { _tryAny.apply(self, [arr]); } ]);
    }
    try {
      this._repair();
      func.apply(this);
    }
    catch (err) {
      this._break(err.toString());
    }
  }

  function _push(arr, obj) {
    for (var i = 0; i < arr.length; i++) if (arr[i] === obj) return;
    arr.push(obj);
  }
  function _pop(arr, obj) {
    for (var i = 0; i < arr.length; i++) if (arr[i] === obj) {
      arr.splice(i, 1);
      return;
    }
  }

  // _J: JZZ object
  function _J() {
    _R.apply(this);
  }
  _J.prototype = new _R();

  function _clone(obj, key, val) {
    if (typeof key == 'undefined') return _clone(obj, [], []);
    if (obj instanceof Object) {
      for (var i = 0; i < key.length; i++) if (key[i] === obj) return val[i];
      var ret;
      if (obj instanceof Array) ret = []; else ret = {};
      key.push(obj); val.push(ret);
      for(var k in obj) if (obj.hasOwnProperty(k)) ret[k] = _clone(obj[k], key, val);
      return ret;
    }
    return obj;
  }
  _J.prototype._info = { name: 'JZZ.js', ver: _version, version: _version, inputs: [], outputs: [] };

  var _outs = [];
  var _ins = [];
  var _outsW = [];
  var _insW = [];

  function _postRefresh() {
    _jzz._info.engine = _engine._type;
    _jzz._info.version = _engine._version;
    _jzz._info.sysex = _engine._sysex;
    _jzz._info.inputs = [];
    _jzz._info.outputs = [];
    _outs = [];
    _ins = [];
    _engine._allOuts = {};
    _engine._allIns = {};
    var i, x;
    for (i = 0; i < _engine._outs.length; i++) {
      x = _engine._outs[i];
      x.engine = _engine;
      _engine._allOuts[x.name] = x;
      _jzz._info.outputs.push({
        id: x.name,
        name: x.name,
        manufacturer: x.manufacturer,
        version: x.version,
        engine: _engine._type
      });
      _outs.push(x);
    }
    for (i = 0; i < _virtual._outs.length; i++) {
      x = _virtual._outs[i];
      _jzz._info.outputs.push({
        id: x.name,
        name: x.name,
        manufacturer: x.manufacturer,
        version: x.version,
        engine: x.type
      });
      _outs.push(x);
    }
    for (i = 0; i < _engine._ins.length; i++) {
      x = _engine._ins[i];
      x.engine = _engine;
      _engine._allIns[x.name] = x;
      _jzz._info.inputs.push({
        id: x.name,
        name: x.name,
        manufacturer: x.manufacturer,
        version: x.version,
        engine: _engine._type
      });
      _ins.push(x);
    }
    for (i = 0; i < _virtual._ins.length; i++) {
      x = _virtual._ins[i];
      _jzz._info.inputs.push({
        id: x.name,
        name: x.name,
        manufacturer: x.manufacturer,
        version: x.version,
        engine: x.type
      });
      _ins.push(x);
    }
    if (_jzz._watcher && _jzz._watcher._handles.length) {
      var diff = _diff(_insW, _outsW, _jzz._info.inputs, _jzz._info.outputs);
       if (diff) {
        for (j = 0; j < diff.inputs.removed.length; j++) {
          x = _engine._inMap[diff.inputs.removed[j].name];
          if (x) x._closeAll();
        }
        for (j = 0; j < diff.outputs.removed.length; j++) {
          x = _engine._outMap[diff.outputs.removed[j].name];
          if (x) x._closeAll();
        }
        _fireW(diff);
      }
    }
    _insW = _jzz._info.inputs;
    _outsW = _jzz._info.outputs;
  }
  function _refresh() {
    if (!this._bad) _engine._refresh(this);
  }
  _J.prototype.refresh = function() {
    this._push(_refresh, []);
    return this._thenable();
  };

  function _filterList(q, arr) {
    var i, n;
    if (q instanceof Function) q = q(arr);
    if (!(q instanceof Array)) q = [q];
    var before = [];
    var after = [];
    var etc = arr.slice();
    var a = before;
    for (i = 0; i < q.length; i++) {
      if (typeof q[i] == 'undefined') a = after;
      else if (q[i] instanceof RegExp) for (n = 0; n < etc.length; n++) {
        if (q[i].test(etc[n].name)) {
          a.push(etc[n]);
          etc.splice(n, 1);
          n--;
        }
      }
      else {
        for (n = 0; n < etc.length; n++) if (q[i] + '' === n + '' || q[i] === etc[n].name || (q[i] instanceof Object && q[i].name === etc[n].name)) {
          a.push(etc[n]);
          etc.splice(n, 1);
          n--;
        }
      }
    }
    return a == before ? before : before.concat(etc).concat(after);
  }

  function _notFound(port, q) {
    var msg;
    if (q instanceof RegExp) msg = 'Port matching ' + q + ' not found';
    else if (q instanceof Object || typeof q == 'undefined') msg = 'Port not found';
    else msg = 'Port "' + q + '" not found';
    port._crash(msg);
  }
  function _openMidiOut(port, arg) {
    if (this._bad) port._crash(this._err());
    else {
      var arr = _filterList(arg, _outs);
      if (!arr.length) { _notFound(port, arg); return; }
      var pack = function(x) { return function() { x.engine._openOut(this, x.name); }; };
      for (var i = 0; i < arr.length; i++) arr[i] = pack(arr[i]);
      port._slip(_tryAny, [arr]);
      port._resume();
    }
  }
  _J.prototype.openMidiOut = function(arg) {
    var port = new _M();
    this._push(_refresh, []);
    this._push(_openMidiOut, [port, arg]);
    return port._thenable();
  };
  _J.prototype._openMidiOutNR = function(arg) {
    var port = new _M();
    this._push(_openMidiOut, [port, arg]);
    return port._thenable();
  };

  function _openMidiIn(port, arg) {
    if (this._bad) port._crash(this._err());
    else {
      var arr = _filterList(arg, _ins);
      if (!arr.length) { _notFound(port, arg); return; }
      var pack = function(x) { return function() { x.engine._openIn(this, x.name); }; };
      for (var i = 0; i < arr.length; i++) arr[i] = pack(arr[i]);
      port._slip(_tryAny, [arr]);
      port._resume();
    }
  }
  _J.prototype.openMidiIn = function(arg) {
    var port = new _M();
    this._push(_refresh, []);
    this._push(_openMidiIn, [port, arg]);
    return port._thenable();
  };
  _J.prototype._openMidiInNR = function(arg) {
    var port = new _M();
    this._push(_openMidiIn, [port, arg]);
    return port._thenable();
  };

  function _onChange(watcher, arg) {
    if (this._bad) watcher._crash();
    else {
      watcher._slip(_connectW, [arg]);
      watcher._resume();
    }
  }
  _J.prototype.onChange = function(arg) {
    if (!this._orig._watcher) this._orig._watcher = new _W();
    var watcher = this._orig._watcher._image();
    this._push(_onChange, [watcher, arg]);
    return watcher._thenable();
  };

  _J.prototype._close = function() {
    _engine._close();
  };

  // _M: MIDI-In/Out object
  function _M() {
    _R.apply(this);
    this._handles = [];
    this._outs = [];
  }
  _M.prototype = new _R();
  _M.prototype._filter = function(msg) {
    if (this._orig._mpe) {
      var out;
      var outs = 0;
      if (this._handles && this._handles.length) {
        outs = this._handles.length;
        out = this._handles[0];
      }
      if (this._outs && this._outs.length) {
        outs = this._outs.length;
        out = this._outs[0];
      }
      if (outs == 1 && !out._mpe) {
        msg = this._orig._mpe.filter(msg);
      }
    }
    return msg;
  };
  _M.prototype._receive = function(msg) { this._emit(this._filter(msg)); };
  function _receive(msg) { if (!this._bad) this._receive(msg); }
  _M.prototype.send = function() {
    this._push(_receive, [MIDI.apply(null, arguments)]);
    return this._thenable();
  };
  _M.prototype.note = function(c, n, v, t) {
    this.noteOn(c, n, v);
    if (t > 0) this.wait(t).noteOff(c, n);
    return this._thenable();
  };
  _M.prototype._emit = function(msg) {
    var i;
    for (i = 0; i < this._handles.length; i++) this._handles[i].apply(this, [MIDI(msg)._stamp(this)]);
    for (i = 0; i < this._outs.length; i++) {
      var m = MIDI(msg);
      if (!m._stamped(this._outs[i])) this._outs[i].send(m._stamp(this));
    }
  };
  function _emit(msg) { this._emit(msg); }
  _M.prototype.emit = function(msg) {
    this._push(_emit, [msg]);
    return this._thenable();
  };
  function _connect(arg) {
    if (arg instanceof Function) _push(this._orig._handles, arg);
    else _push(this._orig._outs, arg);
  }
  function _disconnect(arg) {
    if (typeof arg == 'undefined') {
      this._orig._handles = [];
      this._orig._outs = [];
    }
    else if (arg instanceof Function) _pop(this._orig._handles, arg);
    else _pop(this._orig._outs, arg);
  }
  _M.prototype.connect = function(arg) {
    this._push(_connect, [arg]);
    return this._thenable();
  };
  _M.prototype.disconnect = function(arg) {
    this._push(_disconnect, [arg]);
    return this._thenable();
  };
  _M.prototype.connected = function() {
    return this._orig._handles.length + this._orig._outs.length;
  };
  _M.prototype.ch = function(n) {
    if (typeof n == 'undefined') return this;
    _validateChannel(n);
    var chan = new _C(this, n);
    this._push(_kick, [chan]);
    return chan._thenable();
  };
  function _mpe(m, n) {
    if (!this._orig._mpe) this._orig._mpe = new MPE();
    this._orig._mpe.setup(m, n);
  }
  _M.prototype.mpe = function(m, n) {
    if (typeof m == 'undefined' && typeof n == 'undefined') return this;
    MPE.validate(m, n);
    var chan = n ? new _E(this, m, n) : new _C(this, m);
    this._push(_mpe, [m, n]);
    this._push(_kick, [chan]);
    return chan._thenable();
  };
  function _validateChannel(c) {
    if (c != parseInt(c) || c < 0 || c > 15)
      throw RangeError('Bad channel value (must not be less than 0 or more than 15): ' + c);
  }

  // _C: MIDI Channel object
  function _C(port, chan) {
    _M.apply(this);
    this._port = port._orig;
    this._chan = chan;
    _rechain(this, this._port, 'ch');
    _rechain(this, this._port, 'mpe');
    _rechain(this, this._port, 'connect');
    _rechain(this, this._port, 'disconnect');
    _rechain(this, this._port, 'close');
  }
  _C.prototype = new _M();
  _C.prototype.channel = function() { return this._chan; };
  _C.prototype._receive = function(msg) { this._port._receive(msg); };
  _C.prototype.note = function(n, v, t) {
    this.noteOn(n, v);
    if (t) this.wait(t).noteOff(n);
    return this._thenable();
  };

  // _E: MPE Channel object
  function _E(port, m, n) {
    _M.apply(this);
    this._port = port._orig;
    this._master = m;
    this._band = n;
    _rechain(this, this._port, 'ch');
    _rechain(this, this._port, 'mpe');
    _rechain(this, this._port, 'connect');
    _rechain(this, this._port, 'disconnect');
    _rechain(this, this._port, 'close');
  }
  _E.prototype = new _M();
  _E.prototype.channel = function() { return this._master; };
  _E.prototype._receive = function(msg) { this._port._receive(msg); };
  _E.prototype.note = function(n, v, t) {
    this.noteOn(n, v);
    if (t) this.wait(t).noteOff(n);
    return this._thenable();
  };

  // _W: Watcher object ~ MIDIAccess.onstatechange
  function _W() {
    _R.apply(this);
    this._handles = [];
    _rechain(this, _jzz, 'refresh');
    _rechain(this, _jzz, 'openMidiOut');
    _rechain(this, _jzz, 'openMidiIn');
    _rechain(this, _jzz, 'onChange');
    _rechain(this, _jzz, 'close');
  }
  _W.prototype = new _R();
  function _connectW(arg) {
    if (arg instanceof Function) {
      if (!this._orig._handles.length) _engine._watch();
      _push(this._orig._handles, arg);
    }
  }
  function _disconnectW(arg) {
    if (typeof arg == 'undefined') this._orig._handles = [];
    else _pop(this._orig._handles, arg);
    if (!this._orig._handles.length) _engine._unwatch();
  }
  _W.prototype.connect = function(arg) {
    this._push(_connectW, [arg]);
    return this._thenable();
  };
  _W.prototype.disconnect = function(arg) {
    this._push(_disconnectW, [arg]);
    return this._thenable();
  };
  function _changed(x0, y0, x1, y1) {
    var i;
    if (x0.length != x1.length || y0.length != y1.length) return true;
    for (i = 0; i < x0.length; i++) if (x0[i].name != x1[i].name) return true;
    for (i = 0; i < y0.length; i++) if (y0[i].name != y1[i].name) return true;
    return false;
  }
  function _diff(x0, y0, x1, y1) {
    if (!_changed(x0, y0, x1, y1)) return;
    var ax = []; // added
    var ay = [];
    var rx = []; // removed
    var ry = [];
    var i;
    var h = {};
    for (i = 0; i < x0.length; i++) h[x0[i].name] = true;
    for (i = 0; i < x1.length; i++) if (!h[x1[i].name]) ax.push(x1[i]);
    h = {};
    for (i = 0; i < x1.length; i++) h[x1[i].name] = true;
    for (i = 0; i < x0.length; i++) if (!h[x0[i].name]) rx.push(x0[i]);
    h = {};
    for (i = 0; i < y0.length; i++) h[y0[i].name] = true;
    for (i = 0; i < y1.length; i++) if (!h[y1[i].name]) ay.push(y1[i]);
    h = {};
    for (i = 0; i < y1.length; i++) h[y1[i].name] = true;
    for (i = 0; i < y0.length; i++) if (!h[y0[i].name]) ry.push(y0[i]);
    return { inputs: { added: ax, removed: rx }, outputs: { added: ay, removed: ry } };
  }
  function _fireW(arg) {
    for (i = 0; i < _jzz._watcher._handles.length; i++) _jzz._watcher._handles[i].apply(_jzz, [arg]);
  }

  var _jzz;
  var _engine = { _outs: [], _ins: [] };
  var _virtual = { _outs: [], _ins: [] };

  // Node.js
  function _tryNODE() {
    if (typeof module != 'undefined' && module.exports) {
      _initNode(require('jazz-midi'));
      return;
    }
    this._break();
  }
  // Jazz-Plugin
  function _tryJazzPlugin() {
    var div = document.createElement('div');
    div.style.visibility = 'hidden';
    document.body.appendChild(div);
    var obj = document.createElement('object');
    obj.style.visibility = 'hidden';
    obj.style.width = '0px'; obj.style.height = '0px';
    obj.classid = 'CLSID:1ACE1618-1C7D-4561-AEE1-34842AA85E90';
    obj.type = 'audio/x-jazz';
    document.body.appendChild(obj);
    if (obj.isJazz) {
      _initJazzPlugin(obj);
      return;
    }
    this._break();
  }

  // Web MIDI API
  var _navigator;
  var _requestMIDIAccess;
  if (typeof navigator !== 'undefined' && navigator.requestMIDIAccess) {
    _navigator = navigator;
    _requestMIDIAccess = navigator.requestMIDIAccess;
    try {
      if (_requestMIDIAccess.toString().indexOf('JZZ(') != -1) _requestMIDIAccess = undefined;
    }
    catch (err) {}
  }
  function _tryWebMIDI() {
    if (_requestMIDIAccess) {
      var self = this;
      var onGood = function(midi) {
        _initWebMIDI(midi);
        self._resume();
      };
      var onBad = function(msg) {
        self._crash(msg);
      };
      var opt = {};
      _requestMIDIAccess.call(_navigator, opt).then(onGood, onBad);
      this._pause();
      return;
    }
    this._break();
  }
  function _tryWebMIDIsysex() {
    if (_requestMIDIAccess) {
      var self = this;
      var onGood = function(midi) {
        _initWebMIDI(midi, true);
        self._resume();
      };
      var onBad = function(msg) {
        self._crash(msg);
      };
      var opt = {sysex:true};
      _requestMIDIAccess.call(_navigator, opt).then(onGood, onBad);
      this._pause();
      return;
    }
    this._break();
  }
  // Web-extension
  function _tryCRX() {
    var self = this;
    var inst;
    var msg;
    function eventHandle() {
      inst = true;
      if (!msg) msg = document.getElementById('jazz-midi-msg');
      if (!msg) return;
      var a = [];
      try { a = JSON.parse(msg.innerText); } catch (err) {}
      msg.innerText = '';
      document.removeEventListener('jazz-midi-msg', eventHandle);
      if (a[0] === 'version') {
        _initCRX(msg, a[2]);
        self._resume();
      }
      else {
        self._crash();
      }
    }
    this._pause();
    document.addEventListener('jazz-midi-msg', eventHandle);
    try { document.dispatchEvent(new Event('jazz-midi')); } catch (err) {}
    _schedule(function() { if (!inst) self._crash(); });
  }

  function _zeroBreak() {
    this._pause();
    var self = this;
    _schedule(function() { self._crash(); });
  }

  function _filterEngines(opt) {
    var ret = [];
    var arr = _filterEngineNames(opt);
    for (var i = 0; i < arr.length; i++) {
      if (arr[i] == 'webmidi') {
        if (opt && opt.sysex === true) ret.push(_tryWebMIDIsysex);
        if (!opt || opt.sysex !== true || opt.degrade === true) ret.push(_tryWebMIDI);
      }
      else if (arr[i] == 'node') { ret.push(_tryNODE); ret.push(_zeroBreak); }
      else if (arr[i] == 'extension') ret.push(_tryCRX);
      else if (arr[i] == 'plugin') ret.push(_tryJazzPlugin);
    }
    ret.push(_initNONE);
    return ret;
  }

  function _filterEngineNames(opt) {
    var web = ['node', 'extension', 'plugin', 'webmidi'];
    if (!opt || !opt.engine) return web;
    var arr = opt.engine instanceof Array ? opt.engine : [opt.engine];
    var dup = {};
    var none;
    var etc;
    var head = [];
    var tail = [];
    var i;
    for (i = 0; i < arr.length; i++) {
      var name = arr[i].toString().toLowerCase();
      if (dup[name]) continue;
      dup[name] = true;
      if (name === 'none') none = true;
      if (name === 'etc' || typeof name == 'undefined') etc = true;
      if (etc) tail.push(name); else head.push(name);
      _pop(web, name);
    }
    if (etc || head.length || tail.length) none = false;
    return none ? [] : head.concat(etc ? web : tail);
  }

  function _initJZZ(opt) {
    _initAudioContext();
    _jzz = new _J();
    _jzz._options = opt;
    _jzz._push(_tryAny, [_filterEngines(opt)]);
    _jzz.refresh();
    _jzz._resume();
  }

  function _initNONE() {
    _engine._type = 'none';
    _engine._version = _version;
    _engine._sysex = true;
    _engine._outs = [];
    _engine._ins = [];
    _engine._refresh = function() { _postRefresh(); };
    _engine._watch = function() {};
    _engine._unwatch = function() {};
    _engine._close = function() {};
  }
  // common initialization for Jazz-Plugin and jazz-midi
  function _initEngineJP() {
    _engine._inArr = [];
    _engine._outArr = [];
    _engine._inMap = {};
    _engine._outMap = {};
    _engine._outsW = [];
    _engine._insW = [];
    _engine._version = _engine._main.version;
    _engine._sysex = true;
    var watcher;
    function _closeAll() {
      for (var i = 0; i < this.clients.length; i++) this._close(this.clients[i]);
    }
    _engine._refresh = function() {
      _engine._outs = [];
      _engine._ins = [];
      var i, x;
      for (i = 0; (x = _engine._main.MidiOutInfo(i)).length; i++) {
        _engine._outs.push({ type: _engine._type, name: x[0], manufacturer: x[1], version: x[2] });
      }
      for (i = 0; (x = _engine._main.MidiInInfo(i)).length; i++) {
        _engine._ins.push({ type: _engine._type, name: x[0], manufacturer: x[1], version: x[2] });
      }
      _postRefresh();
    };
    _engine._openOut = function(port, name) {
      var impl = _engine._outMap[name];
      if (!impl) {
        if (_engine._pool.length <= _engine._outArr.length) _engine._pool.push(_engine._newPlugin());
        impl = {
          name: name,
          clients: [],
          info: {
            name: name,
            manufacturer: _engine._allOuts[name].manufacturer,
            version: _engine._allOuts[name].version,
            type: 'MIDI-out',
            sysex: _engine._sysex,
            engine: _engine._type
          },
          _close: function(port) { _engine._closeOut(port); },
          _closeAll: _closeAll,
          _receive: function(a) { if (a.length) this.plugin.MidiOutRaw(a.slice()); }
        };
        var plugin = _engine._pool[_engine._outArr.length];
        impl.plugin = plugin;
        _engine._outArr.push(impl);
        _engine._outMap[name] = impl;
      }
      if (!impl.open) {
        var s = impl.plugin.MidiOutOpen(name);
        if (s !== name) {
          if (s) impl.plugin.MidiOutClose();
          port._break(); return;
        }
        impl.open = true;
      }
      port._orig._impl = impl;
      _push(impl.clients, port._orig);
      port._info = impl.info;
      port._receive = function(arg) { impl._receive(arg); };
      port._close = function() { impl._close(this); };
    };
    _engine._openIn = function(port, name) {
      var impl = _engine._inMap[name];
      if (!impl) {
        if (_engine._pool.length <= _engine._inArr.length) _engine._pool.push(_engine._newPlugin());
        impl = {
          name: name,
          clients: [],
          info: {
            name: name,
            manufacturer: _engine._allIns[name].manufacturer,
            version: _engine._allIns[name].version,
            type: 'MIDI-in',
            sysex: _engine._sysex,
            engine: _engine._type
          },
          _close: function(port) { _engine._closeIn(port); },
          _closeAll: _closeAll,
          handle: function(t, a) {
            for (var i = 0; i < this.clients.length; i++) {
              var msg = MIDI(a);
              this.clients[i]._emit(msg);
            }
          }
        };
        var makeHandle = function(x) { return function(t, a) { x.handle(t, a); }; };
        impl.onmidi = makeHandle(impl);
        var plugin = _engine._pool[_engine._inArr.length];
        impl.plugin = plugin;
        _engine._inArr.push(impl);
        _engine._inMap[name] = impl;
      }
      if (!impl.open) {
        var s = impl.plugin.MidiInOpen(name, impl.onmidi);
        if (s !== name) {
          if (s) impl.plugin.MidiInClose();
          port._break(); return;
        }
        impl.open = true;
      }
      port._orig._impl = impl;
      _push(impl.clients, port._orig);
      port._info = impl.info;
      port._close = function() { impl._close(this); };
    };
    _engine._closeOut = function(port) {
      var impl = port._impl;
      _pop(impl.clients, port._orig);
      if (!impl.clients.length && impl.open) {
        impl.open = false;
        impl.plugin.MidiOutClose();
      }
    };
    _engine._closeIn = function(port) {
      var impl = port._impl;
      _pop(impl.clients, port._orig);
      if (!impl.clients.length && impl.open) {
        impl.open = false;
        impl.plugin.MidiInClose();
      }
    };
    _engine._close = function() {
      for (var i = 0; i < _engine._inArr.length; i++) if (_engine._inArr[i].open) _engine._inArr[i].plugin.MidiInClose();
      _engine._unwatch();
    };
    _engine._watch = function() {
      if (!watcher) watcher = setInterval(function() { _engine._refresh(); }, 250);
    };
    _engine._unwatch = function() {
      if (watcher) clearInterval(watcher);
      watcher = undefined;
    };
  }

  function _initNode(obj) {
    _engine._type = 'node';
    _engine._main = obj;
    _engine._pool = [];
    _engine._newPlugin = function() { return new obj.MIDI(); };
    _initEngineJP();
  }
  function _initJazzPlugin(obj) {
    _engine._type = 'plugin';
    _engine._main = obj;
    _engine._pool = [obj];
    _engine._newPlugin = function() {
      var plg = document.createElement('object');
      plg.style.visibility = 'hidden';
      plg.style.width = '0px'; obj.style.height = '0px';
      plg.classid = 'CLSID:1ACE1618-1C7D-4561-AEE1-34842AA85E90';
      plg.type = 'audio/x-jazz';
      document.body.appendChild(plg);
      return plg.isJazz ? plg : undefined;
    };
    _initEngineJP();
  }
  function _initWebMIDI(access, sysex) {
    _engine._type = 'webmidi';
    _engine._version = 43;
    _engine._sysex = !!sysex;
    _engine._access = access;
    _engine._inMap = {};
    _engine._outMap = {};
    _engine._outsW = [];
    _engine._insW = [];
    var watcher;
    function _closeAll() {
      for (var i = 0; i < this.clients.length; i++) this._close(this.clients[i]);
    }
    _engine._refresh = function() {
      _engine._outs = [];
      _engine._ins = [];
      _engine._access.outputs.forEach(function(port) {
        _engine._outs.push({type: _engine._type, name: port.name, manufacturer: port.manufacturer, version: port.version});
      });
      _engine._access.inputs.forEach(function(port) {
        _engine._ins.push({type: _engine._type, name: port.name, manufacturer: port.manufacturer, version: port.version});
      });
      _postRefresh();
    };
    _engine._openOut = function(port, name) {
      var impl = _engine._outMap[name];
      if (!impl) {
        impl = {
          name: name,
          clients: [],
          info: {
            name: name,
            manufacturer: _engine._allOuts[name].manufacturer,
            version: _engine._allOuts[name].version,
            type: 'MIDI-out',
            sysex: _engine._sysex,
            engine: _engine._type
          },
          _close: function(port) { _engine._closeOut(port); },
          _closeAll: _closeAll,
          _receive: function(a) { if (impl.dev && a.length) this.dev.send(a.slice()); }
        };
      }
      var found;
      _engine._access.outputs.forEach(function(dev) {
        if (dev.name === name) found = dev;
      });
      if (found) {
        impl.dev = found;
        _engine._outMap[name] = impl;
        port._orig._impl = impl;
        _push(impl.clients, port._orig);
        port._info = impl.info;
        port._receive = function(arg) { impl._receive(arg); };
        port._close = function() { impl._close(this); };
        if (impl.dev.open) {
          port._pause();
          impl.dev.open().then(function() {
            port._resume();
          }, function() {
            port._crash();
          });
        }
      }
      else port._break();
    };
    _engine._openIn = function(port, name) {
      var impl = _engine._inMap[name];
      if (!impl) {
        impl = {
          name: name,
          clients: [],
          info: {
            name: name,
            manufacturer: _engine._allIns[name].manufacturer,
            version: _engine._allIns[name].version,
            type: 'MIDI-in',
            sysex: _engine._sysex,
            engine: _engine._type
          },
          _close: function(port) { _engine._closeIn(port); },
          _closeAll: _closeAll,
          handle: function(evt) {
            for (var i = 0; i < this.clients.length; i++) {
              var msg = MIDI([].slice.call(evt.data));
              this.clients[i]._emit(msg);
            }
          }
        };
      }
      var found;
      _engine._access.inputs.forEach(function(dev) {
        if (dev.name === name) found = dev;
      });
      if (found) {
        impl.dev = found;
        var makeHandle = function(x) { return function(evt) { x.handle(evt); }; };
        impl.dev.onmidimessage = makeHandle(impl);
        _engine._inMap[name] = impl;
        port._orig._impl = impl;
        _push(impl.clients, port._orig);
        port._info = impl.info;
        port._close = function() { impl._close(this); };
        if (impl.dev.open) {
          port._pause();
          impl.dev.open().then(function() {
            port._resume();
          }, function() {
            port._crash();
          });
        }
      }
      else port._break();
    };
    _engine._closeOut = function(port) {
      var impl = port._impl;
      _pop(impl.clients, port._orig);
      if (!impl.clients.length) {
        if (impl.dev && impl.dev.close) impl.dev.close();
        impl.dev = undefined;
      }
    };
    _engine._closeIn = function(port) {
      var impl = port._impl;
      _pop(impl.clients, port._orig);
      if (!impl.clients.length) {
        if (impl.dev) {
          impl.dev.onmidimessage = null;
          if (impl.dev.close) impl.dev.close();
        }
        impl.dev = undefined;
      }
    };
    _engine._close = function() {
      _engine._unwatch();
    };
    _engine._watch = function() {
      _engine._access.onstatechange = function() {
        watcher = true;
        _schedule(function() {
          if (watcher) {
            _engine._refresh();
            watcher = false;
          }
        });
      };
    };
    _engine._unwatch = function() {
      _engine._access.onstatechange = undefined;
    };
  }
  function _initCRX(msg, ver) {
    _engine._type = 'extension';
    _engine._version = ver;
    _engine._sysex = true;
    _engine._pool = [];
    _engine._outs = [];
    _engine._ins = [];
    _engine._inArr = [];
    _engine._outArr = [];
    _engine._inMap = {};
    _engine._outMap = {};
    _engine._outsW = [];
    _engine._insW = [];
    _engine.refreshClients = [];
    _engine._msg = msg;
    _engine._newPlugin = function() {
      var plugin = { id: _engine._pool.length };
      _engine._pool.push(plugin);
      if (!plugin.id) plugin.ready = true;
      else document.dispatchEvent(new CustomEvent('jazz-midi', { detail: ['new'] }));
    };
    _engine._newPlugin();
    _engine._refresh = function(client) {
      _engine.refreshClients.push(client);
      client._pause();
      _schedule(function() {
        document.dispatchEvent(new CustomEvent('jazz-midi', { detail: ['refresh'] }));
      });
    };
    function _closeAll() {
      for (var i = 0; i < this.clients.length; i++) this._close(this.clients[i]);
    }
    _engine._openOut = function(port, name) {
      var impl = _engine._outMap[name];
      if (!impl) {
        if (_engine._pool.length <= _engine._outArr.length) _engine._newPlugin();
        var plugin = _engine._pool[_engine._outArr.length];
        impl = {
          name: name,
          clients: [],
          info: {
            name: name,
            manufacturer: _engine._allOuts[name].manufacturer,
            version: _engine._allOuts[name].version,
            type: 'MIDI-out',
            sysex: _engine._sysex,
            engine: _engine._type
          },
          _start: function() { document.dispatchEvent(new CustomEvent('jazz-midi', { detail: ['openout', plugin.id, name] })); },
          _close: function(port) { _engine._closeOut(port); },
          _closeAll: _closeAll,
          _receive: function(a) { if (a.length) { var v = a.slice(); v.splice(0, 0, 'play', plugin.id); document.dispatchEvent(new CustomEvent('jazz-midi', {detail: v})); } }
        };
        impl.plugin = plugin;
        plugin.output = impl;
        _engine._outArr.push(impl);
        _engine._outMap[name] = impl;
      }
      port._orig._impl = impl;
      _push(impl.clients, port._orig);
      port._info = impl.info;
      port._receive = function(arg) { impl._receive(arg); };
      port._close = function() { impl._close(this); };
      if (!impl.open) {
        port._pause();
        if (impl.plugin.ready) impl._start();
      }
    };
    _engine._openIn = function(port, name) {
      var impl = _engine._inMap[name];
      if (!impl) {
        if (_engine._pool.length <= _engine._inArr.length) _engine._newPlugin();
        var plugin = _engine._pool[_engine._inArr.length];
        impl = {
          name: name,
          clients: [],
          info: {
            name: name,
            manufacturer: _engine._allIns[name].manufacturer,
            version: _engine._allIns[name].version,
            type: 'MIDI-in',
            sysex: _engine._sysex,
            engine: _engine._type
          },
          _start: function() { document.dispatchEvent(new CustomEvent('jazz-midi', { detail: ['openin', plugin.id, name] })); },
          _close: function(port) { _engine._closeIn(port); },
          _closeAll: _closeAll
        };
        impl.plugin = plugin;
        plugin.input = impl;
        _engine._inArr.push(impl);
        _engine._inMap[name] = impl;
      }
      port._orig._impl = impl;
      _push(impl.clients, port._orig);
      port._info = impl.info;
      port._close = function() { impl._close(this); };
      if (!impl.open) {
        port._pause();
        if (impl.plugin.ready) impl._start();
      }
    };
    _engine._closeOut = function(port) {
      var impl = port._impl;
      _pop(impl.clients, port._orig);
      if (!impl.clients.length && impl.open) {
        impl.open = false;
        document.dispatchEvent(new CustomEvent('jazz-midi', { detail: ['closeout', impl.plugin.id] }));
      }
    };
    _engine._closeIn = function(port) {
      var impl = port._impl;
      _pop(impl.clients, port._orig);
      if (!impl.clients.length && impl.open) {
        impl.open = false;
        document.dispatchEvent(new CustomEvent('jazz-midi', { detail: ['closein', impl.plugin.id] }));
      }
    };
    _engine._close = function() {
      _engine._unwatch();
    };
    var watcher;
    _engine._watch = function() {
      _engine._insW = _engine._ins;
      _engine._outsW = _engine._outs;
      watcher = setInterval(function() {
        document.dispatchEvent(new CustomEvent('jazz-midi', {detail:['refresh']}));
      }, 250);
    };
    _engine._unwatch = function() {
      clearInterval(watcher);
      watcher = undefined;
    };
    document.addEventListener('jazz-midi-msg', function() {
      var v = _engine._msg.innerText.split('\n');
      var impl, i, j;
      _engine._msg.innerText = '';
      for (i = 0; i < v.length; i++) {
        var a = [];
        try { a = JSON.parse(v[i]); } catch (err) {}
        if (!a.length) continue;
        if (a[0] === 'refresh') {
          if (a[1].ins) {
            for (j = 0; j < a[1].ins.length; j++) a[1].ins[j].type = _engine._type;
            _engine._ins = a[1].ins;
          }
          if (a[1].outs) {
            for (j = 0; j < a[1].outs.length; j++) a[1].outs[j].type = _engine._type;
            _engine._outs = a[1].outs;
          }
          _postRefresh();
          for (j = 0; j < _engine.refreshClients.length; j++) _engine.refreshClients[j]._resume();
          _engine.refreshClients = [];
        }
        else if (a[0] === 'version') {
          var plugin = _engine._pool[a[1]];
          if (plugin) {
            plugin.ready = true;
            if (plugin.input) plugin.input._start();
            if (plugin.output) plugin.output._start();
          }
        }
        else if (a[0] === 'openout') {
          impl = _engine._pool[a[1]].output;
          if (impl) {
            if (a[2] == impl.name) {
              impl.open = true;
              if (impl.clients) for (j = 0; j < impl.clients.length; j++) impl.clients[j]._resume();
            }
            else if (impl.clients) for (j = 0; j < impl.clients.length; j++) impl.clients[j]._crash();
          }
        }
        else if (a[0] === 'openin') {
          impl = _engine._pool[a[1]].input;
          if (impl) {
            if (a[2] == impl.name) {
              impl.open = true;
              if (impl.clients) for (j = 0; j < impl.clients.length; j++) impl.clients[j]._resume();
            }
            else if (impl.clients) for (j = 0; j < impl.clients.length; j++) impl.clients[j]._crash();
          }
        }
        else if (a[0] === 'midi') {
          impl = _engine._pool[a[1]].input;
          if (impl && impl.clients) {
            for (j = 0; j < impl.clients.length; j++) {
              var msg = MIDI(a.slice(3));
              impl.clients[j]._emit(msg);
            }
          }
        }
      }
    });
  }

  var JZZ = function(opt) {
    if (!_jzz) _initJZZ(opt);
    return _jzz._thenable();
  };
  JZZ.JZZ = JZZ;
  JZZ.version = _version;
  JZZ.info = function() { return _J.prototype.info(); };
  JZZ.Widget = function(arg) {
    var obj = new _M();
    if (arg instanceof Object) for (var k in arg) if (arg.hasOwnProperty(k)) obj[k] = arg[k];
    obj._resume();
    return obj;
  };
  _J.prototype.Widget = JZZ.Widget;
  JZZ.addMidiIn = function(name, widget) {
    var info = _clone(widget._info || {});
    info.name = name;
    info.type = info.type || 'javascript';
    info.manufacturer = info.manufacturer || 'virtual';
    info.version = info.version || '0.0';
    var engine = {
      _info: function() { return info; },
      _openIn: function(port) {
        port._pause();
        port._info = _clone(info);
        port._close = function() { widget.disconnect(port); };
        widget.connect(port);
        port._resume();
      }
    };
    return JZZ.lib.registerMidiIn(name, engine);
  };
  JZZ.addMidiOut = function(name, widget) {
    var info = _clone(widget._info || {});
    info.name = name;
    info.type = info.type || 'javascript';
    info.manufacturer = info.manufacturer || 'virtual';
    info.version = info.version || '0.0';
    var engine = {
      _info: function() { return info; },
      _openOut: function(port) {
        port._pause();
        port._info = _clone(info);
        port._close = function() { port.disconnect(); };
        _connect.apply(port, [widget]);
        port._resume();
      }
    };
    return JZZ.lib.registerMidiOut(name, engine);
  };

  // JZZ.SMPTE

  function SMPTE() {
    var self = this instanceof SMPTE ? this : self = new SMPTE();
    SMPTE.prototype.reset.apply(self, arguments);
    return self;
  }
  SMPTE.prototype.reset = function(arg) {
    if (arg instanceof SMPTE) {
      this.setType(arg.getType());
      this.setHour(arg.getHour());
      this.setMinute(arg.getMinute());
      this.setSecond(arg.getSecond());
      this.setFrame(arg.getFrame());
      this.setQuarter(arg.getQuarter());
      return this;
    }
    var arr = arg instanceof Array ? arg : arguments;
    this.setType(arr[0]);
    this.setHour(arr[1]);
    this.setMinute(arr[2]);
    this.setSecond(arr[3]);
    this.setFrame(arr[4]);
    this.setQuarter(arr[5]);
    return this;
  };
  function _fixDropFrame() { if (this.type == 29.97 && !this.second && this.frame < 2 && this.minute % 10) this.frame = 2; }
  SMPTE.prototype.isFullFrame = function() { return this.quarter == 0 || this.quarter == 4; };
  SMPTE.prototype.getType = function() { return this.type; };
  SMPTE.prototype.getHour = function() { return this.hour; };
  SMPTE.prototype.getMinute = function() { return this.minute; };
  SMPTE.prototype.getSecond = function() { return this.second; };
  SMPTE.prototype.getFrame = function() { return this.frame; };
  SMPTE.prototype.getQuarter = function() { return this.quarter; };
  SMPTE.prototype.setType = function(x) {
    if (typeof x == 'undefined' || x == 24) this.type = 24;
    else if (x == 25) this.type = 25;
    else if (x == 29.97) { this.type = 29.97; _fixDropFrame.apply(this); }
    else if (x == 30) this.type = 30;
    else throw RangeError('Bad SMPTE frame rate: ' + x);
    if (this.frame >= this.type) this.frame = this.type - 1; // could not be more than 29
    return this;
  };
  SMPTE.prototype.setHour = function(x) {
    if (typeof x == 'undefined') x = 0;
    if (x != parseInt(x) || x < 0 || x >= 24) throw RangeError('Bad SMPTE hours value: ' + x);
    this.hour = x;
    return this;
  };
  SMPTE.prototype.setMinute = function(x) {
    if (typeof x == 'undefined') x = 0;
    if (x != parseInt(x) || x < 0 || x >= 60) throw RangeError('Bad SMPTE minutes value: ' + x);
    this.minute = x;
    _fixDropFrame.apply(this);
    return this;
  };
  SMPTE.prototype.setSecond = function(x) {
    if (typeof x == 'undefined') x = 0;
    if (x != parseInt(x) || x < 0 || x >= 60) throw RangeError('Bad SMPTE seconds value: ' + x);
    this.second = x;
    _fixDropFrame.apply(this);
    return this;
  };
  SMPTE.prototype.setFrame = function(x) {
    if (typeof x == 'undefined') x = 0;
    if (x != parseInt(x) || x < 0 || x >= this.type) throw RangeError('Bad SMPTE frame number: ' + x);
    this.frame = x;
    _fixDropFrame.apply(this);
    return this;
  };
  SMPTE.prototype.setQuarter = function(x) {
    if (typeof x == 'undefined') x = 0;
    if (x != parseInt(x) || x < 0 || x >= 8) throw RangeError('Bad SMPTE quarter frame: ' + x);
    this.quarter = x;
    return this;
  };
  SMPTE.prototype.incrFrame = function() {
    this.frame++;
    if (this.frame >= this.type) {
      this.frame = 0;
      this.second++;
      if (this.second >= 60) {
        this.second = 0;
        this.minute++;
        if (this.minute >= 60) {
          this.minute = 0;
          this.hour = this.hour >= 23 ? 0 : this.hour + 1;
        }
      }
    }
    _fixDropFrame.apply(this);
    return this;
  };
  SMPTE.prototype.decrFrame = function() {
    if (!this.second && this.frame == 2 && this.type == 29.97 && this.minute % 10) this.frame = 0; // drop-frame
    this.frame--;
    if (this.frame < 0) {
      this.frame = this.type == 29.97 ? 29 : this.type - 1;
      this.second--;
      if (this.second < 0) {
        this.second = 59;
        this.minute--;
        if (this.minute < 0) {
          this.minute = 59;
          this.hour = this.hour ? this.hour - 1 : 23;
        }
      }
    }
    return this;
  };
  SMPTE.prototype.incrQF = function() {
    this.backwards = false;
    this.quarter = (this.quarter + 1) & 7;
    if (this.quarter == 0 || this.quarter == 4) this.incrFrame();
    return this;
  };
  SMPTE.prototype.decrQF = function() {
    this.backwards = true;
    this.quarter = (this.quarter + 7) & 7;
    if (this.quarter == 3 || this.quarter == 7) this.decrFrame();
    return this;
  };
  function _825(a) { return [[24, 25, 29.97, 30][(a[7] >> 1) & 3], ((a[7] & 1) << 4) | a[6], (a[5] << 4) | a[4], (a[3] << 4) | a[2], (a[1] << 4) | a[0]]; }
  SMPTE.prototype.read = function(m) {
    if (!(m instanceof MIDI)) m = MIDI.apply(null, arguments);
    if (m[0] == 0xf0 && m[1] == 0x7f && m[3] == 1 && m[4] == 1 && m[9] == 0xf7) {
      this.type = [24, 25, 29.97, 30][(m[5] >> 5) & 3];
      this.hour = m[5] & 31;
      this.minute = m[6];
      this.second = m[7];
      this.frame = m[8];
      this.quarter = 0;
      this._ = undefined;
      this._b = undefined;
      this._f = undefined;
      return true;
    }
    if (m[0] == 0xf1 && typeof m[1] != 'undefined') {
      var q = m[1] >> 4;
      var n = m[1] & 15;
      if (q == 0) {
        if (this._ == 7) {
          if (this._f == 7) {
            this.reset(_825(this._a));
            this.incrFrame();
          }
          this.incrFrame();
        }
      }
      else if (q == 3) {
        if (this._ == 4) {
          this.decrFrame();
        }
      }
      else if (q == 4) {
        if (this._ == 3) {
          this.incrFrame();
        }
      }
      else if (q == 7) {
        if (this._ === 0) {
          if (this._b === 0) {
            this.reset(_825(this._a));
            this.decrFrame();
          }
          this.decrFrame();
        }
      }
      if (!this._a) this._a = [];
      this._a[q] = n;
      this._f = this._f === q - 1 || q == 0 ? q : undefined;
      this._b = this._b === q + 1 || q == 7 ? q : undefined;
      this._ = q;
      this.quarter = q;
      return true;
    }
    return false;
  };
  function _mtc(t) {
    if (!t.backwards && t.quarter >= 4) t.decrFrame(); // continue encoding previous frame
    else if (t.backwards && t.quarter < 4) t.incrFrame();
    var ret;
    switch (t.quarter >> 1) {
      case 0: ret = t.frame; break;
      case 1: ret = t.second; break;
      case 2: ret = t.minute; break;
      default: ret = t.hour;
    }
    if (t.quarter & 1) ret >>= 4;
    else ret &= 15;
    if (t.quarter == 7) {
      if (t.type == 25) ret |= 2;
      else if (t.type == 29.97) ret |= 4;
      else if (t.type == 30) ret |= 6;
    }
    // restore original t
    if (!t.backwards && t.quarter >= 4) t.incrFrame();
    else if (t.backwards && t.quarter < 4) t.decrFrame();
    return ret | (t.quarter << 4);
  }
  function _hrtype(t) {
    if (t.type == 25) return t.hour | 0x20;
    if (t.type == 29.97) return t.hour | 0x40;
    if (t.type == 30) return t.hour | 0x60;
    return t.hour;
  }
  function _dec(x) { return x < 10 ? '0' + x : x; }
  function _smptetxt(x) {
    var arr = [];
    for (var i = 0; i < x.length; i++) arr[i] = _dec(x[i]);
    return arr.join(':');
  }
  SMPTE.prototype.toString = function() { return _smptetxt([this.hour, this.minute, this.second, this.frame]); };
  JZZ.SMPTE = SMPTE;

  // JZZ.MIDI

  function MIDI(arg) {
    var self = this instanceof MIDI ? this : self = new MIDI();
    var i;
    if (arg instanceof MIDI) {
      self._from = arg._from.slice();
      for (i in arg) if (arg.hasOwnProperty(i) && i != '_from') self[i] = arg[i];
      return self;
    }
    else self._from = [];
    if (typeof arg == 'undefined') return self;
    var arr = arg instanceof Array ? arg : arguments;
    for (i = 0; i < arr.length; i++) {
      n = arr[i];
      if (i == 1) {
        if (self[0] >= 0x80 && self[0] <= 0xAF) n = MIDI.noteValue(n);
        if (self[0] >= 0xC0 && self[0] <= 0xCF) n = MIDI.programValue(n);
      }
      if (n != parseInt(n) || n < 0 || n > 255) _throw(arr[i]);
      self.push(n);
    }
    return self;
  }
  MIDI.prototype = [];
  MIDI.prototype.constructor = MIDI;
  var _noteNum = {};
  MIDI.noteValue = function(x) { return typeof x == 'undefined' ? undefined : _noteNum[x.toString().toLowerCase()]; };
  MIDI.programValue = function(x) { return x; };
  MIDI.freq = function(n, a) {
    if (typeof a == 'undefined') a = 440.0;
    return (a * Math.pow(2, (_7b(MIDI.noteValue(n), n) - 69.0) / 12.0));
  };
  MIDI.to14b = function(x) { return x <= 0 ? 0 : x >= 1 ? 0x3fff : Math.floor(x * 0x4000); };

  var _noteMap = { c:0, d:2, e:4, f:5, g:7, a:9, b:11, h:11 };
  for (k in _noteMap) {
    if (!_noteMap.hasOwnProperty(k)) continue;
    for (n = 0; n < 12; n++) {
      m = _noteMap[k] + n * 12;
      if (m > 127) break;
      _noteNum[k+n] = m;
      if (m > 0) { _noteNum[k + 'b' + n] = m - 1; _noteNum[k + 'bb' + n] = m - 2; }
      if (m < 127) { _noteNum[k + '#' + n] = m + 1; _noteNum[k + '##' + n] = m + 2; }
    }
  }
  for (n = 0; n < 128; n++) _noteNum[n] = n;
  function _throw(x) { throw RangeError('Bad MIDI value: ' + x); }
  function _ch(c) { _validateChannel(c); return parseInt(c); }
  function _7b(n, m) { if (n != parseInt(n) || n < 0 || n > 0x7f) _throw(typeof m == 'undefined' ? n : m); return parseInt(n); }
  function _8b(n, m) { if (n != parseInt(n) || n < 0 || n > 0xff) _throw(typeof m == 'undefined' ? n : m); return parseInt(n); }
  function _lsb(n) { if (n != parseInt(n) || n < 0 || n > 0x3fff) _throw(n); return parseInt(n) & 0x7f; }
  function _msb(n) { if (n != parseInt(n) || n < 0 || n > 0x3fff) _throw(n); return parseInt(n) >> 7; }
  function _8bs(s) { s = '' + s; for (var i = 0; i < s.length; i++) if (s.charCodeAt(i) > 255) _throw(s[i]); return s; }
  var _helperCH = {
    noteOff: function(c, n, v) { if (typeof v == 'undefined') v = 64; return [0x80 + _ch(c), _7b(MIDI.noteValue(n), n), _7b(v)]; },
    noteOn: function(c, n, v) { if (typeof v == 'undefined') v = 127; return [0x90 + _ch(c), _7b(MIDI.noteValue(n), n), _7b(v)]; },
    aftertouch: function(c, n, v) { return [0xA0 + _ch(c), _7b(MIDI.noteValue(n), n), _7b(v)]; },
    control: function(c, n, v) { return [0xB0 + _ch(c), _7b(n), _7b(v)]; },
    program: function(c, n) { return [0xC0 + _ch(c), _7b(MIDI.programValue(n), n)]; },
    pressure: function(c, n) { return [0xD0 + _ch(c), _7b(n)]; },
    pitchBend: function(c, n, l) { return typeof l == 'undefined' ? [0xE0 + _ch(c), _lsb(n), _msb(n)] : [0xE0 + _ch(c), _7b(l), _7b(n)]; },
    pitchBendF: function(c, x) { return _helperCH.pitchBend(c, MIDI.to14b((x + 1) / 2)); },
    bankMSB: function(c, n) { return [0xB0 + _ch(c), 0x00, _7b(n)]; },
    bankLSB: function(c, n) { return [0xB0 + _ch(c), 0x20, _7b(n)]; },
    modMSB: function(c, n) { return [0xB0 + _ch(c), 0x01, _7b(n)]; },
    modLSB: function(c, n) { return [0xB0 + _ch(c), 0x21, _7b(n)]; },
    breathMSB: function(c, n) { return [0xB0 + _ch(c), 0x02, _7b(n)]; },
    breathLSB: function(c, n) { return [0xB0 + _ch(c), 0x22, _7b(n)]; },
    footMSB: function(c, n) { return [0xB0 + _ch(c), 0x04, _7b(n)]; },
    footLSB: function(c, n) { return [0xB0 + _ch(c), 0x24, _7b(n)]; },
    portamentoMSB: function(c, n) { return [0xB0 + _ch(c), 0x05, _7b(n)]; },
    portamentoLSB: function(c, n) { return [0xB0 + _ch(c), 0x25, _7b(n)]; },
    dataMSB: function(c, n) { return [0xB0 + _ch(c), 0x06, _7b(n)]; },
    dataLSB: function(c, n) { return [0xB0 + _ch(c), 0x26, _7b(n)]; },
    volumeMSB: function(c, n) { return [0xB0 + _ch(c), 0x07, _7b(n)]; },
    volumeLSB: function(c, n) { return [0xB0 + _ch(c), 0x27, _7b(n)]; },
    balanceMSB: function(c, n) { return [0xB0 + _ch(c), 0x08, _7b(n)]; },
    balanceLSB: function(c, n) { return [0xB0 + _ch(c), 0x28, _7b(n)]; },
    panMSB: function(c, n) { return [0xB0 + _ch(c), 0x0A, _7b(n)]; },
    panLSB: function(c, n) { return [0xB0 + _ch(c), 0x2A, _7b(n)]; },
    expressionMSB: function(c, n) { return [0xB0 + _ch(c), 0x0B, _7b(n)]; },
    expressionLSB: function(c, n) { return [0xB0 + _ch(c), 0x2B, _7b(n)]; },
    damper: function(c, b) { return [0xB0 + _ch(c), 0x40, b ? 127 : 0]; },
    portamento: function(c, b) { return [0xB0 + _ch(c), 0x41, b ? 127 : 0]; },
    sostenuto: function(c, b) { return [0xB0 + _ch(c), 0x42, b ? 127 : 0]; },
    soft: function(c, b) { return [0xB0 + _ch(c), 0x43, b ? 127 : 0]; },
    dataIncr: function(c) { return [0xB0 + _ch(c), 0x60, 0]; },
    dataDecr: function(c) { return [0xB0 + _ch(c), 0x61, 0]; },
    nrpnLSB: function(c, n) { return [0xB0 + _ch(c), 0x62, _7b(n)]; },
    nrpnMSB: function(c, n) { return [0xB0 + _ch(c), 0x63, _7b(n)]; },
    rpnLSB: function(c, n) { return [0xB0 + _ch(c), 0x64, _7b(n)]; },
    rpnMSB: function(c, n) { return [0xB0 + _ch(c), 0x65, _7b(n)]; },
    allSoundOff: function(c) { return [0xB0 + _ch(c), 0x78, 0]; },
    allNotesOff: function(c) { return [0xB0 + _ch(c), 0x7b, 0]; },
  };
  var _helperNC = { // no channel
    mtc: function(t) { return [0xF1, _mtc(t)]; },
    songPosition: function(n, l) { return typeof l == 'undefined' ? [0xF2, _lsb(n), _msb(n)] : [0xF2, _7b(l), _7b(n)]; },
    songSelect: function(n) { return [0xF3, _7b(n)]; },
    tune: function() { return [0xF6]; },
    clock: function() { return [0xF8]; },
    start: function() { return [0xFA]; },
    continue: function() { return [0xFB]; },
    stop: function() { return [0xFC]; },
    active: function() { return [0xFE]; },
    sxIdRequest: function() { return [0xF0, 0x7E, 0x7F, 0x06, 0x01, 0xF7]; },
    sxFullFrame: function(t) { return [0xF0, 0x7F, 0x7F, 0x01, 0x01, _hrtype(t), t.getMinute(), t.getSecond(), t.getFrame(), 0xF7]; },
    reset: function() { return [0xFF]; },
  };
  var _helperG = { // compound messages
    bank: function(c, m, l) { return typeof l == 'undefined' ?
      [_helperCH.bankMSB(c, _msb(m)), _helperCH.bankLSB(c, _lsb(m))] : [_helperCH.bankMSB(c, m), _helperCH.bankLSB(c, l)]; },
    modF: function(c, x) { return _helperG.mod(c, MIDI.to14b(x)); },
    mod: function(c, m, l) { return typeof l == 'undefined' ?
      [_helperCH.modMSB(c, _msb(m)), _helperCH.modLSB(c, _lsb(m))] : [_helperCH.modMSB(c, m), _helperCH.modLSB(c, l)]; },
    breathF: function(c, x) { return _helperG.breath(c, MIDI.to14b(x)); },
    breath: function(c, m, l) { return typeof l == 'undefined' ?
      [_helperCH.breathMSB(c, _msb(m)), _helperCH.breathLSB(c, _lsb(m))] : [_helperCH.breathMSB(c, m), _helperCH.breathLSB(c, l)]; },
    footF: function(c, x) { return _helperG.foot(c, MIDI.to14b(x)); },
    foot: function(c, m, l) { return typeof l == 'undefined' ?
      [_helperCH.footMSB(c, _msb(m)), _helperCH.footLSB(c, _lsb(m))] : [_helperCH.footMSB(c, m), _helperCH.footLSB(c, l)]; },
    portamentoTimeF: function(c, x) { return _helperG.portamentoTime(c, MIDI.to14b(x)); },
    portamentoTime: function(c, m, l) { return typeof l == 'undefined' ?
      [_helperCH.portamentoMSB(c, _msb(m)), _helperCH.portamentoLSB(c, _lsb(m))] : [_helperCH.portamentoMSB(c, m), _helperCH.portamentoLSB(c, l)]; },
    dataF: function(c, x) { return _helperG.data(c, MIDI.to14b(x)); },
    data: function(c, m, l) { return typeof l == 'undefined' ?
      [_helperCH.dataMSB(c, _msb(m)), _helperCH.dataLSB(c, _lsb(m))] : [_helperCH.dataMSB(c, m), _helperCH.dataLSB(c, l)]; },
    volumeF: function(c, x) { return _helperG.volume(c, MIDI.to14b(x)); },
    volume: function(c, m, l) { return typeof l == 'undefined' ?
      [_helperCH.volumeMSB(c, _msb(m)), _helperCH.volumeLSB(c, _lsb(m))] : [_helperCH.volumeMSB(c, m), _helperCH.volumeLSB(c, l)]; },
    balanceF: function(c, x) { return _helperG.balance(c, MIDI.to14b((x + 1) / 2)); },
    balance: function(c, m, l) { return typeof l == 'undefined' ?
      [_helperCH.balanceMSB(c, _msb(m)), _helperCH.balanceLSB(c, _lsb(m))] : [_helperCH.balanceMSB(c, m), _helperCH.balanceLSB(c, l)]; },
    panF: function(c, x) { return _helperG.pan(c, MIDI.to14b((x + 1) / 2)); },
    pan: function(c, m, l) { return typeof l == 'undefined' ?
      [_helperCH.panMSB(c, _msb(m)), _helperCH.panLSB(c, _lsb(m))] : [_helperCH.panMSB(c, m), _helperCH.panLSB(c, l)]; },
    expressionF: function(c, x) { return _helperG.expression(c, MIDI.to14b(x)); },
    expression: function(c, m, l) { return typeof l == 'undefined' ?
      [_helperCH.expressionMSB(c, _msb(m)), _helperCH.expressionLSB(c, _lsb(m))] : [_helperCH.expressionMSB(c, m), _helperCH.expressionLSB(c, l)]; },
    nrpn: function(c, m, l) { return typeof l == 'undefined' ?
      [_helperCH.nrpnMSB(c, _msb(m)), _helperCH.nrpnLSB(c, _lsb(m))] : [_helperCH.nrpnMSB(c, m), _helperCH.nrpnLSB(c, l)]; },
    rpn: function(c, m, l) { return typeof l == 'undefined' ?
      [_helperCH.rpnMSB(c, _msb(m)), _helperCH.rpnLSB(c, _lsb(m))] : [_helperCH.rpnMSB(c, m), _helperCH.rpnLSB(c, l)]; },
  };
  function _smf(ff, dd) {
    var midi = new MIDI();
    midi.ff = _8b(ff);
    midi.dd = typeof dd == 'undefined' ? '' : _8bs(dd);
    return midi;
  }
  var _helperSMF = { // Standard MIDI File events
    smf: function(arg) {
      if (arg instanceof MIDI) return new MIDI(arg);
      var arr = arg instanceof Array ? arg : arguments;
      var ff = _8b(arr[0]);
      var dd = '';
      if (arr.length == 2) dd = _2s(arr[1]);
      else if (arr.length > 2) dd = _2s(Array.prototype.slice.call(arr, 1));
      return _smf(ff, dd);
    },
    smfSeqNumber: function(dd) {
      if (dd == parseInt(dd)) {
        if (dd < 0 || dd > 0xffff) throw RangeError('Sequence number out of range: ' + dd);
        dd = String.fromCharCode(dd >> 8) + String.fromCharCode(dd & 0xff);
      }
      else {
        dd = '' + dd;
        if (dd.length == 0) dd = '\x00\x00';
        else if (dd.length == 1) dd = '\x00' + dd;
        else if (dd.length > 2) throw RangeError('Sequence number out of range: ' + _smftxt(dd));
      }
      return _smf(0, dd);
    },
    smfText: function(dd) { return _smf(1, JZZ.lib.toUTF8(dd)); },
    smfCopyright: function(dd) { return _smf(2, JZZ.lib.toUTF8(dd)); },
    smfSeqName: function(dd) { return _smf(3, JZZ.lib.toUTF8(dd)); },
    smfInstrName: function(dd) { return _smf(4, JZZ.lib.toUTF8(dd)); },
    smfLyric: function(dd) { return _smf(5, JZZ.lib.toUTF8(dd)); },
    smfMarker: function(dd) { return _smf(6, JZZ.lib.toUTF8(dd)); },
    smfCuePoint: function(dd) { return _smf(7, JZZ.lib.toUTF8(dd)); },
    smfProgName: function(dd) { return _smf(8, JZZ.lib.toUTF8(dd)); },
    smfDevName: function(dd) { return _smf(9, JZZ.lib.toUTF8(dd)); },
    smfChannelPrefix: function(dd) {
      if (dd == parseInt(dd)) {
        _validateChannel(dd);
        dd = String.fromCharCode(dd);
      }
      else {
        dd = '' + dd;
        if (dd.length == 0) dd = '\x00';
        else if (dd.length > 1 || dd.charCodeAt(0) > 15) throw RangeError('Channel number out of range: ' + _smftxt(dd));
      }
      return _smf(32, dd);
    },
    smfMidiPort: function(dd) {
      if (dd == parseInt(dd)) {
        if (dd < 0 || dd > 127) throw RangeError('Port number out of range: ' + dd);
        dd = String.fromCharCode(dd);
      }
      else {
        dd = '' + dd;
        if (dd.length == 0) dd = '\x00';
        else if (dd.length > 1 || dd.charCodeAt(0) > 127) throw RangeError('Port number out of range: ' + _smftxt(dd));
      }
      return _smf(33, dd);
    },
    smfEndOfTrack: function(dd) {
      if (_2s(dd) != '') throw RangeError('Unexpected data: ' + _smftxt(_2s(dd)));
      return _smf(47);
    },
    smfTempo: function(dd) { // microseconds per quarter note
      if (('' + dd).length == 3) return _smf(81, dd);
      if (dd == parseInt(dd) && dd > 0 && dd <= 0xffffff) {
        return _smf(81, String.fromCharCode(dd >> 16) + String.fromCharCode((dd >> 8) & 0xff) + String.fromCharCode(dd & 0xff));
      }
      throw RangeError('Out of range: ' + _smftxt(_2s(dd)));
    },
    smfBPM: function(bpm) { return _helperSMF.smfTempo(Math.round(60000000.0 / bpm)); },
    smfSMPTE: function(dd) {
      if (dd instanceof SMPTE) return _smf(84, String.fromCharCode(dd.hour) + String.fromCharCode(dd.minute) + String.fromCharCode(dd.second) + String.fromCharCode(dd.frame) + String.fromCharCode((dd.quarter % 4) * 25));
      var s = '' + dd;
      if (s.length == 5) {
        return _smf(84, dd);
      }
      var arr = dd instanceof Array ? dd : Array.prototype.slice.call(arguments);
      arr.splice(0, 0, 30);
      return _helperSMF.smfSMPTE(new SMPTE(arr));
    },
    smfTimeSignature: function(a, b, c, d) {
      var nn, dd, cc, bb;
      var m = ('' + a ).match(/^\s*(\d+)\s*\/\s*(\d+)\s*$/);
      if (m) {
        nn = parseInt(m[1]);
        dd = parseInt(m[2]);
        if (nn > 0 && nn <= 0xff && dd && !(dd & (dd - 1))) {
          cc = dd; dd = 0;
          for (cc >>= 1; cc; cc >>= 1) dd++;
          cc = b == parseInt(b) ? b : 24;
          bb = c == parseInt(c) ? c : 8;
          return _smf(88, String.fromCharCode(nn) + String.fromCharCode(dd) + String.fromCharCode(cc) + String.fromCharCode(bb));
        }
        else if (('' + a ).length == 4) return _smf(88, a);
      }
      else if (a == parseInt(a) && b == parseInt(b) && b && !(b & (b - 1))) {
        nn = a;
        dd = 0;
        cc = b;
        for (cc >>= 1; cc; cc >>= 1) dd++;
        cc = c == parseInt(c) ? c : 24;
        bb = d == parseInt(d) ? d : 8;
        return _smf(88, String.fromCharCode(nn) + String.fromCharCode(dd) + String.fromCharCode(cc) + String.fromCharCode(bb));
      }
      else if (('' + a ).length == 4) return _smf(88, a);
      throw RangeError('Wrong time signature: ' + _smftxt(_2s(a)));
    },
    smfKeySignature: function(dd) {
      dd = '' + dd;
      var m = dd.match(/^\s*([A-H][b#]?)\s*(|maj|major|dur|m|min|minor|moll)\s*$/i);
      if (m) {
        var sf = {
          CB: 0, GB: 1, DB: 2, AB: 3, EB: 4, BB: 5, F: 6, C: 7, G: 8, D: 9, A: 10,
          E:11, B: 12, H: 12, 'F#': 13, 'C#': 14, 'G#': 15, 'D#': 16, 'A#': 17
        }[m[1].toUpperCase()];
        var mi = { '': 0, MAJ: 0, MAJOR: 0, DUR: 0, M: 1, MIN: 1, MINOR: 1, MOLL: 1}[m[2].toUpperCase()];
        if (typeof sf != 'undefined' && typeof mi != 'undefined') {
          if (mi) sf -= 3;
          sf -= 7;
          if (sf >= -7 && sf < 0) dd = String.fromCharCode(256 + sf) + String.fromCharCode(mi);
          else if (sf >= 0 && sf <= 7) dd = String.fromCharCode(sf) + String.fromCharCode(mi);
        }
      }
      if (dd.length == 2 && dd.charCodeAt(1) <= 1 && (dd.charCodeAt(0) <= 7 || dd.charCodeAt(0) <= 255 && dd.charCodeAt(0) >= 249)) return _smf(89, dd);
      throw RangeError('Incorrect key signature: ' + _smftxt(dd));
    },
    smfSequencer: function(dd) { return _smf(127, _2s(dd)); }
  };

  function _copyPortHelper(M, name, func) {
    M.prototype[name] = function() { return this.send(func.apply(0, arguments)); };
  }
  function _copyPortHelperG(M, name, func) {
    M.prototype[name] = function() {
      var a = func.apply(0, arguments);
      var g = this;
      for (var i = 0; i < a.length; i++) g = g.send(a[i]);
      return g;
    };
  }
  function _copyChannelHelper(C, name, func) {
    C.prototype[name] = function() {
      return this.send(func.apply(0, [this._chan].concat(Array.prototype.slice.call(arguments))));
    };
  }
  function _copyChannelHelperG(C, name, func) {
    C.prototype[name] = function() {
      var a = func.apply(0, [this._chan].concat(Array.prototype.slice.call(arguments)));
      var g = this;
      for (var i = 0; i < a.length; i++) g = g.send(a[i]);
      return g;
    };
  }
  function _copyHelperNC(name, func) {
    MIDI[name] = function() { return new MIDI(func.apply(0, arguments)); };
  }
  function _copyHelperSMF(name, func) {
    MIDI[name] = function() { return func.apply(0, arguments); };
  }
  function _copyHelperG(name, func) {
    MIDI[name] = function() {
      var i;
      var g = [];
      var a = func.apply(0, arguments);
      for (i = 0; i < a.length; i++) g.push(new MIDI(a[i]));
      return g;
    };
  }
  function _copyHelperCH(name, func) {
    _copyHelperNC(name, func);
    _E.prototype[name] = function() {
      var chan;
      var args = Array.prototype.slice.call(arguments);
      if (args.length < func.length) args = [this._master].concat(args);
      else {
        chan = _7b(MIDI.noteValue(args[0], args[0]));
        args[0] = this._master;
      }
      var msg = func.apply(0, args);
      msg.mpe = chan;
      this.send(msg);
      return this;
    };
  }
  for (k in _helperNC) if (_helperNC.hasOwnProperty(k)) _copyHelperNC(k, _helperNC[k]);
  for (k in _helperSMF) if (_helperSMF.hasOwnProperty(k)) _copyHelperSMF(k, _helperSMF[k]);
  for (k in _helperCH) if (_helperCH.hasOwnProperty(k)) _copyHelperCH(k, _helperCH[k]);
  for (k in _helperG) if (_helperG.hasOwnProperty(k)) _copyHelperG(k, _helperG[k]);
  function _copyMidiHelpers(M, C) {
    for (k in _helperNC) if (_helperNC.hasOwnProperty(k)) _copyPortHelper(M, k, _helperNC[k]);
    for (k in _helperSMF) if (_helperSMF.hasOwnProperty(k)) _copyPortHelper(M, k, _helperSMF[k]);
    for (k in _helperCH) if (_helperCH.hasOwnProperty(k)) _copyPortHelper(M, k, _helperCH[k]);
    for (k in _helperG) if (_helperG.hasOwnProperty(k)) _copyPortHelperG(M, k, _helperG[k]);
    if (C) {
      for (k in _helperCH) if (_helperCH.hasOwnProperty(k)) _copyChannelHelper(C, k, _helperCH[k]);
      for (k in _helperG) if (_helperG.hasOwnProperty(k)) _copyChannelHelperG(C, k, _helperG[k]);
    }
  }
  _copyMidiHelpers(_M, _C);

  _E.prototype.noteOn = function(n, v) {
    var msg = MIDI.noteOn(this._master, n, v);
    msg._mpe = msg[1];
    this.send(msg);
    return this;
  };
  _E.prototype.noteOff = function(n, v) {
    var msg = MIDI.noteOff(this._master, n, v);
    msg._mpe = msg[1];
    this.send(msg);
    return this;
  };
  _E.prototype.aftertouch = function(n, v) {
    var msg = MIDI.aftertouch(this._master, n, v);
    msg._mpe = msg[1];
    this.send(msg);
    return this;
  };

  var _channelMap = { a:10, b:11, c:12, d:13, e:14, f:15, A:10, B:11, C:12, D:13, E:14, F:15 };
  for (k = 0; k < 16; k++) _channelMap[k] = k;
  MIDI.prototype.getChannel = function() {
    if (this.ff == 0x20 && this.dd.length == 1 && this.dd.charCodeAt(0) < 16) return this.dd.charCodeAt(0);
    var c = this[0];
    if (typeof c == 'undefined' || c < 0x80 || c > 0xef) return;
    return c & 15;
  };
  MIDI.prototype.setChannel = function(x) {
    x = _channelMap[x];
    if (typeof x == 'undefined') return this;
    if (this.ff == 0x20) this.dd = String.fromCharCode(x);
    else {
      var c = this[0];
      if (typeof c != 'undefined' && c >= 0x80 && c <= 0xef) this[0] = (c & 0xf0) | x;
    }
    return this;
  };
  MIDI.prototype.getNote = function() {
    var c = this[0];
    if (typeof c == 'undefined' || c < 0x80 || c > 0xaf) return;
    return this[1];
  };
  MIDI.prototype.setNote = function(x) {
    var c = this[0];
    if (typeof c == 'undefined' || c < 0x80 || c > 0xaf) return this;
    x = MIDI.noteValue(x);
    if (typeof x != 'undefined') this[1] = x;
    return this;
  };
  MIDI.prototype.getVelocity = function() {
    var c = this[0];
    if (typeof c == 'undefined' || c < 0x80 || c > 0x9f) return;
    return this[2];
  };
  MIDI.prototype.setVelocity = function(x) {
    var c = this[0];
    if (typeof c == 'undefined' || c < 0x80 || c > 0x9f) return this;
    x = parseInt(x);
    if (x >= 0 && x < 128) this[2] = x;
    return this;
  };
  MIDI.prototype.getSysExChannel = function() {
    if (this[0] == 0xf0) return this[2];
  };
  MIDI.prototype.setSysExChannel = function(x) {
    if (this[0] == 0xf0 && this.length > 2) {
      x = parseInt(x);
      if (x >= 0 && x < 128) this[2] = x;
    }
    return this;
  };
  MIDI.prototype.getData = function() {
    if (typeof this.dd != 'undefined') return this.dd.toString();
  };
  MIDI.prototype.setData = function(dd) {
    this.dd = _2s(dd);
    return this;
  };
  MIDI.prototype.getText = function() {
    if (typeof this.dd != 'undefined') return JZZ.lib.fromUTF8(this.dd);
  };
  MIDI.prototype.setText = function(dd) {
    this.dd = JZZ.lib.toUTF8(dd);
    return this;
  };
  MIDI.prototype.getTempo = function() {
    if (this.ff == 0x51 && typeof this.dd != 'undefined') {
      return this.dd.charCodeAt(0) * 65536 + this.dd.charCodeAt(1) * 256 + this.dd.charCodeAt(2);
    }
  };
  MIDI.prototype.getBPM = function() {
    var ms = this.getTempo();
    if (ms) return 60000000 / ms;
  };
  MIDI.prototype.getTimeSignature = function() {
    if (this.ff == 0x58 && typeof this.dd != 'undefined') {
       return [this.dd.charCodeAt(0), 1 << this.dd.charCodeAt(1)];
    }
  };
  MIDI.prototype.getKeySignature = function() {
    if (this.ff == 0x59 && typeof this.dd != 'undefined') {
      var sf = this.dd.charCodeAt(0);
      var mi = this.dd.charCodeAt(1);
      if (sf & 0x80) sf = sf - 0x100;
      if (sf >= -7 && sf <= 7 && mi >= 0 && mi <= 1) {
        return [sf,
          ['Cb', 'Gb', 'Db', 'Ab', 'Eb', 'Bb', 'F', 'C', 'G', 'D', 'A', 'E', 'B', 'F#', 'C#', 'G#', 'D#', 'A#'][mi ? sf + 10 : sf + 7],
          !!mi
        ];
      }
    }
  };

  MIDI.prototype.isNoteOn = function() {
    var c = this[0];
    if (typeof c == 'undefined' || c < 0x90 || c > 0x9f) return false;
    return this[2] > 0 ? true : false;
  };
  MIDI.prototype.isNoteOff = function() {
    var c = this[0];
    if (typeof c == 'undefined' || c < 0x80 || c > 0x9f) return false;
    if (c < 0x90) return true;
    return this[2] == 0 ? true : false;
  };
  MIDI.prototype.isSysEx = function() {
    return this[0] == 0xf0;
  };
  MIDI.prototype.isFullSysEx = function() {
    return this[0] == 0xf0 && this[this.length - 1] == 0xf7;
  };
  MIDI.prototype.isSMF = function() {
    return this.ff >= 0 && this.ff <= 0x7f;
  };
  MIDI.prototype.isEOT = function() {
    return this.ff == 0x2f;
  };
  MIDI.prototype.isTempo = function() {
    return this.ff == 0x51;
  };
  MIDI.prototype.isTimeSignature = function() {
    return this.ff == 0x58;
  };
  MIDI.prototype.isKeySignature = function() {
    return this.ff == 0x59;
  };

  function _s2a(x) {
    var a = [];
    for (var i = 0; i < x.length; i++) {
      a[i] = x.charCodeAt(i);
    }
    return a;
  }
  function _a2s(x) {
    var a = '';
    for (var i = 0; i < x.length; i++) {
      a += String.fromCharCode(x[i]);
    }
    return a;
  }
  function _2s(x) {
    return x instanceof Array ? _a2s(x) : typeof x == 'undefined' ? '' : '' + x;
  }
  function _s2n(x) {
    var n = 0;
    for (var i = 0; i < x.length; i++) n = (n << 8) + x.charCodeAt(i);
    return n;
  }

  function __hex(x) { return (x < 16 ? '0' : '') + x.toString(16); }
  function _hex(x) {
    var a = [];
    for (var i = 0; i < x.length; i++) {
      a[i] = __hex(x[i]);
    }
    return a.join(' ');
  }
  function _toLine(s) {
    var out = '';
    for (var i = 0; i < s.length; i++) {
      if (s[i] == '\n') out += '\\n';
      else if (s[i] == '\r') out += '\\r';
      else if (s[i] == '\t') out += '\\t';
      else if (s.charCodeAt(i) < 32) out += '\\x' + __hex(s.charCodeAt(i));
      else out += s[i];
    }
    return out;
  }
  function _smfhex(dd) {
    return dd.length ? ': ' + _hex(_s2a(dd)) : '';
  }
  function _smftxt(dd) {
    return dd.length ? ': ' + _toLine(JZZ.lib.fromUTF8(dd)) : '';
  }
  MIDI.prototype.toString = function() {
    var s;
    var ss;
    if (!this.length) {
      if (typeof this.ff != 'undefined') {
        s = 'ff' + __hex(this.ff) + ' -- ';
        if (this.ff == 0) s += 'Sequence Number: ' + _s2n(this.dd);
        else if (this.ff > 0 && this.ff < 10) s += ['', 'Text', 'Copyright', 'Sequence Name', 'Instrument Name', 'Lyric', 'Marker', 'Cue Point', 'Program Name', 'Device Name'][this.ff] + _smftxt(this.dd);
        else if (this.ff == 32) s += 'Channel Prefix' + _smfhex(this.dd);
        else if (this.ff == 33) s += 'MIDI Port' + _smfhex(this.dd);
        else if (this.ff == 47) s += 'End of Track' + _smfhex(this.dd);
        else if (this.ff == 81) {
          var bpm = Math.round(this.getBPM() * 100) / 100;
          s += 'Tempo: ' + bpm + ' bpm';
        }
        else if (this.ff == 84) s += 'SMPTE Offset: ' + _smptetxt(_s2a(this.dd));
        else if (this.ff == 88) {
          var d = 1 << this.dd.charCodeAt(1);
          s += 'Time Signature: ' + this.dd.charCodeAt(0) + '/' + d;
          s += ' ' + this.dd.charCodeAt(2) + ' ' + this.dd.charCodeAt(3);
        }
        else if (this.ff == 89) {
          s += 'Key Signature: ';
          var ks = this.getKeySignature();
          if (ks) {
            s += ks[1];
            if (ks[2]) s += ' min';
          }
          else s+= 'invalid';
        }
        else if (this.ff == 127) s += 'Sequencer Specific' + _smfhex(this.dd);
        else s += 'SMF' + _smfhex(this.dd);
        return s;
      }
      return 'empty';
    }
    s = _hex(this);
    if (this[0] < 0x80) return s;
    ss = {
      241: 'MIDI Time Code',
      242: 'Song Position',
      243: 'Song Select',
      244: 'Undefined',
      245: 'Undefined',
      246: 'Tune request',
      248: 'Timing clock',
      249: 'Undefined',
      250: 'Start',
      251: 'Continue',
      252: 'Stop',
      253: 'Undefined',
      254: 'Active Sensing',
      255: 'Reset'
    }[this[0]];
    if (ss) return s + ' -- ' + ss;
    var c = this[0] >> 4;
    ss = {8: 'Note Off', 10: 'Aftertouch', 12: 'Program Change', 13: 'Channel Aftertouch', 14: 'Pitch Wheel'}[c];
    if (ss) return s + ' -- ' + ss;
    if (c == 9) return s + ' -- ' + (this[2] ? 'Note On' : 'Note Off');
    if (c != 11) return s;
    ss = {
      0: 'Bank Select MSB',
      1: 'Modulation Wheel MSB',
      2: 'Breath Controller MSB',
      4: 'Foot Controller MSB',
      5: 'Portamento Time MSB',
      6: 'Data Entry MSB',
      7: 'Channel Volume MSB',
      8: 'Balance MSB',
      10: 'Pan MSB',
      11: 'Expression Controller MSB',
      12: 'Effect Control 1 MSB',
      13: 'Effect Control 2 MSB',
      16: 'General Purpose Controller 1 MSB',
      17: 'General Purpose Controller 2 MSB',
      18: 'General Purpose Controller 3 MSB',
      19: 'General Purpose Controller 4 MSB',
      32: 'Bank Select LSB',
      33: 'Modulation Wheel LSB',
      34: 'Breath Controller LSB',
      36: 'Foot Controller LSB',
      37: 'Portamento Time LSB',
      38: 'Data Entry LSB',
      39: 'Channel Volume LSB',
      40: 'Balance LSB',
      42: 'Pan LSB',
      43: 'Expression Controller LSB',
      44: 'Effect control 1 LSB',
      45: 'Effect control 2 LSB',
      48: 'General Purpose Controller 1 LSB',
      49: 'General Purpose Controller 2 LSB',
      50: 'General Purpose Controller 3 LSB',
      51: 'General Purpose Controller 4 LSB',
      64: 'Damper Pedal On/Off',
      65: 'Portamento On/Off',
      66: 'Sostenuto On/Off',
      67: 'Soft Pedal On/Off',
      68: 'Legato Footswitch',
      69: 'Hold 2',
      70: 'Sound Controller 1',
      71: 'Sound Controller 2',
      72: 'Sound Controller 3',
      73: 'Sound Controller 4',
      74: 'Sound Controller 5',
      75: 'Sound Controller 6',
      76: 'Sound Controller 7',
      77: 'Sound Controller 8',
      78: 'Sound Controller 9',
      79: 'Sound Controller 10',
      80: 'General Purpose Controller 5',
      81: 'General Purpose Controller 6',
      82: 'General Purpose Controller 7',
      83: 'General Purpose Controller 8',
      84: 'Portamento Control',
      88: 'High Resolution Velocity Prefix',
      91: 'Effects 1 Depth',
      92: 'Effects 2 Depth',
      93: 'Effects 3 Depth',
      94: 'Effects 4 Depth',
      95: 'Effects 5 Depth',
      96: 'Data Increment',
      97: 'Data Decrement',
      98: 'Non-Registered Parameter Number LSB',
      99: 'Non-Registered Parameter Number MSB',
      100: 'Registered Parameter Number LSB',
      101: 'Registered Parameter Number MSB',
      120: 'All Sound Off',
      121: 'Reset All Controllers',
      122: 'Local Control On/Off',
      123: 'All Notes Off',
      124: 'Omni Mode Off',
      125: 'Omni Mode On',
      126: 'Mono Mode On',
      127: 'Poly Mode On'
    }[this[1]];
    if (!ss) ss = 'Undefined';
    return s + ' -- ' + ss;
  };
  MIDI.prototype._stamp = function(obj) { this._from.push(obj._orig ? obj._orig : obj); return this; };
  MIDI.prototype._unstamp = function(obj) {
    if (typeof obj == 'undefined') this._from = [];
    else {
      if (obj._orig) obj = obj._orig;
      var i = this._from.indexOf(obj);
      if (i > -1) this._from.splice(i, 1);
    }
    return this;
  };
  MIDI.prototype._stamped = function(obj) {
    if (obj._orig) obj = obj._orig;
    for (var i = 0; i < this._from.length; i++) if (this._from[i] == obj) return true;
    return false;
  };

  JZZ.MIDI = MIDI;

  function MPE() {
    var self = this instanceof MPE ? this : self = new MPE();
    self.reset();
    if (arguments.length) MPE.prototype.setup.apply(self, arguments);
    return self;
  }
  MPE.validate = function(arg) {
    var a = arg instanceof Array ? arg : arguments;
    if (a[0] != parseInt(a[0]) || a[0] < 0 || a[0] > 14) throw RangeError('Bad master channel value: ' + a[0]);
    if (a[1] != parseInt(a[1]) || a[1] < 0 || a[0] + a[1] > 15) throw RangeError('Bad zone size value: ' + a[1]);
  };
  MPE.prototype.reset = function() { for (var n = 0; n < 16; n++) this[n] = { band: 0, master: n }; };
  MPE.prototype.setup = function(m, n) {
    MPE.validate(m, n);
    var k;
    var last = m + n;
    if (this[m].master == m && this[m].band == n) return;
    if (!n && !this[m].band) return;
    if (this[m].band) {
      k = m + this[m].band;
      if (last < k) last = k;
    }
    else if (this[m].master == m - 1) {
      k = m - 1;
      k = k + this[k].band;
      if (last < k) last = k;
      this[m - 1] = { band: 0, master: m - 1 };
    }
    else if (this[m].master != m) {
      k = this[m].master;
      k = k + this[k].band;
      if (last < k) last = k;
      this[this[m].master].band = m - this[m].master - 1;
    }
    this[m].master = m;
    this[m].band = n;
    for (k = m + 1; k <= m + n; k++) {
      if (this[k].band && last < k + this[k].band) last = k + this[k].band;
      this[k] = { band: 0, master: m };
    }
    for (; k <= last; k++) this[k] = { band: 0, master: k };
  };
  MPE.prototype.filter = function(msg) {
    var c = msg.getChannel();
    if (!this[c] || !this[this[c].master].band) return msg;
    var m = this[c].master;
    var n = this[m].band;
    var i, j, k;
    if (typeof msg._mpe != 'undefined') {
      k = 256;
      for (i = m + 1; i <= m + n; i++) {
        if (!this[i].notes) {
          if (k > 0) { c = i; k = 0; }
        }
        else {
          if (k > this[i].notes.length) { c = i; k = this[i].notes.length; }
          for (j = 0; j < this[i].notes.length; j++) {
            if (this[i].notes[j] == msg._mpe) { c = i; k = -1; break; }
          }
        }
      }
      msg.setChannel(c);
      msg._mpe = undefined;
    }
    if (c == m) return msg; // bad mpe
    if (msg.isNoteOn()) {
      if (!this[c].notes) this[c].notes = [];
      _push(this[c].notes, msg.getNote());
    }
    else if (msg.isNoteOff()) {
      if (this[c].notes) _pop(this[c].notes, msg.getNote());
    }
    return msg;
  };
  JZZ.MPE = MPE;

  JZZ.lib = {};
  JZZ.lib.now = _now;
  JZZ.lib.schedule = _schedule;
  JZZ.lib.openMidiOut = function(name, engine) {
    var port = new _M();
    engine._openOut(port);
    port._info = engine._info(name);
    return port;
  };
  JZZ.lib.openMidiIn = function(name, engine) {
    var port = new _M();
    engine._openIn(port);
    port._info = engine._info(name);
    return port;
  };
  JZZ.lib.registerMidiOut = function(name, engine) {
    var x = engine._info(name);
    for (var i = 0; i < _virtual._outs.length; i++) if (_virtual._outs[i].name == x.name) return false;
    x.engine = engine;
    _virtual._outs.push(x);
    if (_jzz) {
      _postRefresh();
      if (_jzz._bad) { _jzz._repair(); _jzz._resume(); }
    }
    return true;
  };
  JZZ.lib.registerMidiIn = function(name, engine) {
    var x = engine._info(name);
    for (var i = 0; i < _virtual._ins.length; i++) if (_virtual._ins[i].name == x.name) return false;
    x.engine = engine;
    _virtual._ins.push(x);
    if (_jzz) {
      _postRefresh();
      if (_jzz._bad) { _jzz._repair(); _jzz._resume(); }
    }
    return true;
  };
  var _ac;
  function _initAudioContext() {
    if (!_ac && typeof window !== 'undefined') {
      var AudioContext = window.AudioContext || window.webkitAudioContext;
      if (AudioContext) {
        _ac = new AudioContext();
        if (_ac && !_ac.createGain) _ac.createGain = _ac.createGainNode;
        var _activateAudioContext = function() {
          if (_ac.state != 'running') {
            _ac.resume();
            var osc = _ac.createOscillator();
            var gain = _ac.createGain();
            try { gain.gain.value = 0; } catch (err) {}
            gain.gain.setTargetAtTime(0, _ac.currentTime, 0.01);
            osc.connect(gain);
            gain.connect(_ac.destination);
            if (!osc.start) osc.start = osc.noteOn;
            if (!osc.stop) osc.stop = osc.noteOff;
            osc.start(0.1); osc.stop(0.11);
          }
          else {
            document.removeEventListener('touchstart', _activateAudioContext);
            document.removeEventListener('touchend', _activateAudioContext);
            document.removeEventListener('mousedown', _activateAudioContext);
            document.removeEventListener('keydown', _activateAudioContext);
          }
        };
        document.addEventListener('touchstart', _activateAudioContext);
        document.addEventListener('touchend', _activateAudioContext);
        document.addEventListener('mousedown', _activateAudioContext);
        document.addEventListener('keydown', _activateAudioContext);
        _activateAudioContext();
      }
    }
  }
  JZZ.lib.copyMidiHelpers = _copyMidiHelpers;
  JZZ.lib.getAudioContext = function() { _initAudioContext(); return _ac; };
  var _b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
  JZZ.lib.fromBase64 = function(input) {
    var output = '';
    var chr1, chr2, chr3;
    var enc1, enc2, enc3, enc4;
    var i = 0;
    input = input.replace(/[^A-Za-z0-9+/=]/g, '');
    while (i < input.length) {
      enc1 = _b64.indexOf(input.charAt(i++));
      enc2 = _b64.indexOf(input.charAt(i++));
      enc3 = _b64.indexOf(input.charAt(i++));
      enc4 = _b64.indexOf(input.charAt(i++));
      chr1 = (enc1 << 2) | (enc2 >> 4);
      chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
      chr3 = ((enc3 & 3) << 6) | enc4;
      output = output + String.fromCharCode(chr1);
      if (enc3 != 64) {
        output = output + String.fromCharCode(chr2);
      }
      if (enc4 != 64) {
        output = output + String.fromCharCode(chr3);
      }
    }
    return output;
  };
  JZZ.lib.toBase64 = function(data) {
    var o1, o2, o3, h1, h2, h3, h4, bits, i = 0, ac = 0, enc = '', arr = [];
    if (!data) return data;
    do {
      o1 = data.charCodeAt(i++);
      o2 = data.charCodeAt(i++);
      o3 = data.charCodeAt(i++);
      bits = o1 << 16 | o2 << 8 | o3;
      h1 = bits >> 18 & 0x3f;
      h2 = bits >> 12 & 0x3f;
      h3 = bits >> 6 & 0x3f;
      h4 = bits & 0x3f;
      arr[ac++] = _b64.charAt(h1) + _b64.charAt(h2) + _b64.charAt(h3) + _b64.charAt(h4);
    } while(i < data.length);
    enc = arr.join('');
    var r = data.length % 3;
    return (r ? enc.slice(0, r - 3) + '==='.slice(r) : enc);
  };
  JZZ.lib.fromUTF8 = function(data) {
    data = typeof data == 'undefined' ? '' : '' + data;
    var out = '';
    var i, n, m;
    for (i = 0; i < data.length; i++) {
      n = data.charCodeAt(i);
      if (n > 0xff) return data;
      if (n < 0x80) out += data[i];
      else if ((n & 0xe0) == 0xc0) {
        n = (n & 0x1f) << 6;
        i++; if (i >= data.length) return data;
        m = data.charCodeAt(i);
        if ((m & 0xc0) != 0x80) return data;
        n += (m & 0x3f);
        out += String.fromCharCode(n);
      }
      else if ((n & 0xf0) == 0xe0) {
        n = (n & 0x0f) << 12;
        i++; if (i >= data.length) return data;
        m = data.charCodeAt(i);
        if ((m & 0xc0) != 0x80) return data;
        n += (m & 0x3f) << 6;
        i++; if (i >= data.length) return data;
        m = data.charCodeAt(i);
        if ((m & 0xc0) != 0x80) return data;
        n += (m & 0x3f);
        out += String.fromCharCode(n);
      }
      else if ((n & 0xf8) == 0xf0) {
        n = (n & 0x07) << 18;
        i++; if (i >= data.length) return data;
        m = data.charCodeAt(i);
        if ((m & 0xc0) != 0x80) return data;
        n += (m & 0x3f) << 12;
        i++; if (i >= data.length) return data;
        m = data.charCodeAt(i);
        if ((m & 0xc0) != 0x80) return data;
        n += (m & 0x3f) << 6;
        i++; if (i >= data.length) return data;
        m = data.charCodeAt(i);
        if ((m & 0xc0) != 0x80) return data;
        n += (m & 0x3f);
        if (n > 0x10ffff) return data;
        n -= 0x10000;
        out += String.fromCharCode(0xd800 + (n >> 10));
        out += String.fromCharCode(0xdc00 + (n & 0x3ff));
      }
    }
    return out;
  };
  JZZ.lib.toUTF8 = function(data) {
    data = typeof data == 'undefined' ? '' : '' + data;
    var out = '';
    var i, n;
    for (i = 0; i < data.length; i++) {
      n = data.charCodeAt(i);
      if (n < 0x80) out += data[i];
      else if (n < 0x800) {
        out += String.fromCharCode(0xc0 + (n >> 6));
        out += String.fromCharCode(0x80 + (n & 0x3f));
      }
      else if (n < 0x10000) {
        out += String.fromCharCode(0xe0 + (n >> 12));
        out += String.fromCharCode(0x80 + ((n >> 6) & 0x3f));
        out += String.fromCharCode(0x80 + (n & 0x3f));
      }
      else {
        out += String.fromCharCode(0xf0 + (n >> 18));
        out += String.fromCharCode(0x80 + ((n >> 12) & 0x3f));
        out += String.fromCharCode(0x80 + ((n >> 6) & 0x3f));
        out += String.fromCharCode(0x80 + (n & 0x3f));
      }
    }
    return out;
  };

  // Web MIDI API
  var _wma = [];
  var _outputMap = {};
  var _inputMap = {};

  var Promise = _scope.Promise;
  if (typeof Promise !== 'function') {
    Promise = function(executor) {
      this.executor = executor;
    };
    Promise.prototype.then = function(resolve, reject) {
      if (typeof resolve !== 'function') {
        resolve = function() {};
      }
      if (typeof reject !== 'function') {
        reject = function() {};
      }
      this.executor(resolve, reject);
    };
  }
  function DOMException(name, message, code) {
    this.name = name;
    this.message = message;
    this.code = code;
  }

  function MIDIConnectionEvent(port, target) {
    this.bubbles = false;
    this.cancelBubble = false;
    this.cancelable = false;
    this.currentTarget = target;
    this.defaultPrevented = false;
    this.eventPhase = 0;
    this.path = [];
    this.port = port;
    this.returnValue = true;
    this.srcElement = target;
    this.target = target;
    this.timeStamp = _now();
    this.type = 'statechange';
  }

  function MIDIMessageEvent(port, data) {
    this.bubbles = false;
    this.cancelBubble = false;
    this.cancelable = false;
    this.currentTarget = port;
    this.data = data;
    this.defaultPrevented = false;
    this.eventPhase = 0;
    this.path = [];
    this.receivedTime = _now();
    this.returnValue = true;
    this.srcElement = port;
    this.target = port;
    this.timeStamp = this.receivedTime;
    this.type = 'midimessage';
  }

  function _statechange(p, a) {
    if (p) {
      if (p.onstatechange) p.onstatechange(new MIDIConnectionEvent(p, p));
      if (a.onstatechange) a.onstatechange(new MIDIConnectionEvent(p, a));
    }
  }

  function MIDIInput(a, p) {
    var self = this;
    var _open = false;
    var _ochng = null;
    var _onmsg = null;
    this.type = 'input';
    this.id = p.id;
    this.name = p.name;
    this.manufacturer = p.man;
    this.version = p.ver;
    Object.defineProperty(this, 'state', { get: function() { return p.connected ? 'connected' : 'disconnected'; }, enumerable: true });
    Object.defineProperty(this, 'connection', { get: function() {
      return _open ? p.proxy ? 'open' : 'pending' : 'closed';
    }, enumerable: true });
    Object.defineProperty(this, 'onmidimessage', {
      get: function() { return _onmsg; },
      set: function(value) {
        if (value instanceof Function) {
          _onmsg = value;
          if (!_open) try { self.open(); } catch(e) {/**/}
        }
        else _onmsg = null;
      },
      enumerable: true
    });
    Object.defineProperty(this, 'onstatechange', {
      get: function() { return _ochng; },
      set: function(value) {
        if (value instanceof Function) _ochng = value;
        else _ochng = null;
      },
      enumerable: true
    });
    this.open = function() {
      return new Promise(function(resolve, reject) {
        if (_open) resolve(self);
        else {
          p.open().then(function() {
            if (!_open) {
              _open = true;
              _statechange(self, a);
            }
            resolve(self);
          }, function() {
            reject(new DOMException('InvalidAccessError', 'Port is not available', 15));
          });
        }
      });
    };
    this.close = function() {
      return new Promise(function(resolve/*, reject*/) {
        if (_open) {
          _open = false;
          p.close();
          _statechange(self, a);
        }
        resolve(self);
      });
    };
    Object.freeze(this);
  }

  function _split(q) {
    var i, k;
    while (q.length) {
      for (i = 0; i < q.length; i++) if (q[i] == parseInt(q[i]) && q[i] >= 0x80 && q[i] <= 0xff && q[i] != 0xf7) break;
      q.splice(0, i);
      if (!q.length) return;
      if (q[0] == 0xf0) {
        for (i = 1; i < q.length; i++) if (q[i] == 0xf7) break;
        if (i == q.length) return;
        return q.splice(0, i + 1);
      }
      else {
        k = _datalen(q[0]) + 1;
        if (k > q.length) return;
        for (i = 1; i < k; i++) if (q[i] != parseInt(q[i]) || q[i] < 0 || q[i] >= 0x80) break;
        if (i == k) return q.splice(0, i);
        else q.splice(0, i);
      }
    }
  }

  function _InputProxy(id, name, man, ver) {
    var self = this;
    this.id = id;
    this.name = name;
    this.man = man;
    this.ver = ver;
    this.connected = true;
    this.ports = [];
    this.pending = [];
    this.proxy = undefined;
    this.queue = [];
    this.onmidi = function(msg) {
      var m;
      self.queue = self.queue.concat(msg.slice());
      for (m = _split(self.queue); m; m = _split(self.queue)) {
        for (i = 0; i < self.ports.length; i++) {
          if (self.ports[i][0].onmidimessage && (m[0] != 0xf0 || self.ports[i][1])) {
            self.ports[i][0].onmidimessage(new MIDIMessageEvent(self, new Uint8Array(m)));
          }
        }
      }
    };
  }
  _InputProxy.prototype.open = function() {
    var self = this;
    return new Promise(function(resolve, reject) {
      var i;
      if (self.proxy || !self.connected) resolve();
      else {
        self.pending.push([resolve, reject]);
        if (self.pending.length == 1) {
          JZZ().openMidiIn(self.name).or(function() {
            for (i = 0; i < self.pending.length; i++) self.pending[i][1]();
            self.pending = [];
          }).and(function() {
            self.proxy = this;
            self.proxy.connect(self.onmidi);
            for (i = 0; i < self.pending.length; i++) self.pending[i][0]();
            self.pending = [];
          });
        }
      }
    });
  };
  _InputProxy.prototype.close = function() {
    var i;
    if (this.proxy) {
      for (i = 0; i < this.ports.length; i++) if (this.ports[i].connection == 'open') return;
      this.proxy.close();
      this.proxy = undefined;
    }
  };
  _InputProxy.prototype.disconnect = function() {
    this.connected = false;
    if (this.proxy) {
      this.proxy.close();
      this.proxy = undefined;
    }
  };
  _InputProxy.prototype.reconnect = function() {
    var self = this;
    var i, p;
    var a = [];
    this.connected = true;
    for (i = 0; i < _wma.length; i++) {
      p = _wma[i].inputs.get(this.id);
      if (p.connection == 'closed') _statechange(p, _wma[i]);
      else a.push([p, _wma[i]]);
    }
    if (a.length) {
      JZZ()._openMidiInNR(self.name).or(function() {
        for (i = 0; i < a.length; i++) a[i][0].close();
      }).and(function() {
        self.proxy = this;
        self.proxy.connect(self.onmidi);
        for (i = 0; i < a.length; i++) _statechange(a[i][0], a[i][1]);
      });
    }
  };

  function _datalen(x) {
    if (x >= 0x80 && x <= 0xbf || x >= 0xe0 && x <= 0xef || x == 0xf2) return 2;
    if (x >= 0xc0 && x <= 0xdf || x == 0xf1 || x == 0xf3) return 1;
    return 0;
  }

  var _epr = "Failed to execute 'send' on 'MIDIOutput': ";

  function _validate(arr, sysex) {
    var i, k;
    var msg;
    var data = [];
    for (i = 0; i < arr.length; i++) {
      if (arr[i] != parseInt(arr[i]) || arr[i] < 0 || arr[i] > 255) throw TypeError(_epr + arr[i] + ' is not a UInt8 value.');
    }
    k = 0;
    for (i = 0; i < arr.length; i++) {
      if (!k) {
        if (arr[i] < 0x80) throw TypeError(_epr + 'Running status is not allowed at index ' + i + ' (' + arr[i] + ').');
        if (arr[i] == 0xf7) throw TypeError(_epr + 'Unexpected end of system exclusive message at index ' + i + ' (' + arr[i] + ').');
        msg = [arr[i]];
        data.push(msg);
        if (arr[i] == 0xf0) {
          if (!sysex) throw new DOMException('InvalidAccessError', _epr + 'System exclusive messag is not allowed at index ' + i + ' (' + arr[i] + ').', 15);
          k = -1;
          for (; i < arr.length; i++) {
            msg.push(arr[i]);
            if (arr[i] == 0xf7) {
              k = 0;
              break;
            }
          }
        }
        else {
          k = _datalen(arr[i]);
        }
      }
      else {
        if (arr[i] > 0x7f) throw TypeError(_epr + 'Unexpected status byte at index ' + i + ' (' + arr[i] + ').');
        msg.push(arr[i]);
        k--;
      }
    }
    if (k) throw TypeError(_epr + 'Message is incomplete');
    return [data];
  }

  function MIDIOutput(a, p) {
    var self = this;
    var _open = false;
    var _ochng = null;
    this.type = 'output';
    this.id = p.id;
    this.name = p.name;
    this.manufacturer = p.man;
    this.version = p.ver;
    Object.defineProperty(this, 'state', { get: function() { return p.connected ? 'connected' : 'disconnected'; }, enumerable: true });
    Object.defineProperty(this, 'connection', { get: function() {
      return _open ? p.proxy ? 'open' : 'pending' : 'closed';
    }, enumerable: true });
    Object.defineProperty(this, 'onstatechange', {
      get: function() { return _ochng; },
      set: function(value) {
        if (value instanceof Function) _ochng = value;
        else _ochng = null;
      },
      enumerable: true
    });
    this.open = function() {
      return new Promise(function(resolve, reject) {
        if (_open) resolve(self);
        else {
          p.open().then(function() {
            if (!_open) {
              _open = true;
              _statechange(self, a);
            }
            resolve(self);
          }, function() {
            reject(new DOMException('InvalidAccessError', 'Port is not available', 15));
          });
        }
      });
    };
    this.close = function() {
      return new Promise(function(resolve/*, reject*/) {
        if (_open) {
          _open = false;
          self.clear();
          p.close();
          _statechange(self, a);
        }
        resolve(self);
      });
    };
    this.clear = function() {
    };
    this.send = function(data, timestamp) {
      _validate(data, a.sysexEnabled);
      if (!p.connected) throw new DOMException('InvalidStateError', 'Port is not connected', 11);
      if (_open) {
        var now = _now();
        if (timestamp > now) setTimeout(function() { p.proxy.send(data); }, timestamp - now);
        else p.proxy.send(data);
      }
      else this.open().then(function() { self.send(data, timestamp); });

    };
    Object.freeze(this);
  }

  function _OutputProxy(id, name, man, ver) {
    this.id = id;
    this.name = name;
    this.man = man;
    this.ver = ver;
    this.connected = true;
    this.ports = [];
    this.pending = [];
    this.proxy = undefined;
  }
  _OutputProxy.prototype.open = function() {
    var self = this;
    return new Promise(function(resolve, reject) {
      var i;
      if (self.proxy || !self.connected) resolve();
      else {
        self.pending.push([resolve, reject]);
        if (self.pending.length == 1) {
          JZZ().openMidiOut(self.name).or(function() {
            for (i = 0; i < self.pending.length; i++) self.pending[i][1]();
            self.pending = [];
          }).and(function() {
            self.proxy = this;
            for (i = 0; i < self.pending.length; i++) self.pending[i][0]();
            self.pending = [];
          });
        }
      }
    });
  };
  _OutputProxy.prototype.close = function() {
    var i;
    if (this.proxy) {
      for (i = 0; i < this.ports.length; i++) if (this.ports[i].connection == 'open') return;
      this.proxy.close();
      this.proxy = undefined;
    }
  };
  _OutputProxy.prototype.disconnect = function() {
    this.connected = false;
    if (this.proxy) {
      this.proxy.close();
      this.proxy = undefined;
    }
  };
  _OutputProxy.prototype.reconnect = function() {
    var self = this;
    var i, p;
    var a = [];
    this.connected = true;
    for (i = 0; i < _wma.length; i++) {
      p = _wma[i].outputs.get(this.id);
      if (p.connection == 'closed') _statechange(p, _wma[i]);
      else a.push([p, _wma[i]]);
    }
    if (a.length) {
      JZZ()._openMidiOutNR(self.name).or(function() {
        for (i = 0; i < a.length; i++) a[i][0].close();
      }).and(function() {
        self.proxy = this;
        for (i = 0; i < a.length; i++) _statechange(a[i][0], a[i][1]);
      });
    }
  };

  function _Maplike(data) {
    this.has = function(id) {
      return data.hasOwnProperty(id) && data[id].connected;
    };
    this.keys = function() {
      try { // some old browsers may have no Map object
        var m = new Map();
        for (var id in data) if (this.has(id)) m.set(id, this.get(id));
        return m.keys();
      } catch (e) {}
    };
    this.values = function() {
      try {
        var m = new Map();
        for (var id in data) if (this.has(id)) m.set(id, this.get(id));
        return m.values();
      } catch (e) {}
    };
    this.entries = function() {
      try {
        var m = new Map();
        for (var id in data) if (this.has(id)) m.set(id, this.get(id));
        return m.entries();
      } catch (e) {}
    };
    this.forEach = function(fun, self) {
      if (typeof self == 'undefined') self = this;
      for (var id in data) if (this.has(id)) fun.call(self, this.get(id), id, this);
    };
    Object.defineProperty(this, 'size', {
      get: function() {
        var len = 0;
        for (var id in data) if (this.has(id)) len++;
        return len;
      },
      enumerable: true
    });
  }

  function MIDIInputMap(_access, _inputs) {
    this.get = function(id) {
      if (_inputMap.hasOwnProperty(id) && _inputMap[id].connected) {
        if (!_inputs[id]) {
          _inputs[id] = new MIDIInput(_access, _inputMap[id]);
          _inputMap[id].ports.push([_inputs[id], _access.sysexEnabled]);
        }
        return _inputs[id];
      }
    };
    Object.freeze(this);
  }
  MIDIInputMap.prototype = new _Maplike(_inputMap);
  MIDIInputMap.prototype.constructor = MIDIInputMap;

  function MIDIOutputMap(_access, _outputs) {
    this.get = function(id) {
      if (_outputMap.hasOwnProperty(id) && _outputMap[id].connected) {
        if (!_outputs[id]) {
          _outputs[id] = new MIDIOutput(_access, _outputMap[id]);
          _outputMap[id].ports.push([_outputs[id], _access.sysexEnabled]);
        }
        return _outputs[id];
      }
    };
    Object.freeze(this);
  }
  MIDIOutputMap.prototype = new _Maplike(_outputMap);
  MIDIOutputMap.prototype.constructor = MIDIOutputMap;

  function _wm_watch(x) {
    var i, k, p, a;
    for (i = 0; i < x.inputs.added.length; i++) {
      p = x.inputs.added[i];
      if (!_inputMap.hasOwnProperty(p.id)) _inputMap[p.id] = new _InputProxy(p.id, p.name, p.manufacturer, p.version);
      _inputMap[p.id].reconnect();
    }
    for (i = 0; i < x.outputs.added.length; i++) {
      p = x.outputs.added[i];
      if (!_outputMap.hasOwnProperty(p.id)) _outputMap[p.id] = new _OutputProxy(p.id, p.name, p.manufacturer, p.version);
      _outputMap[p.id].reconnect();
    }
    for (i = 0; i < x.inputs.removed.length; i++) {
      p = x.inputs.removed[i];
      if (_inputMap.hasOwnProperty(p.id)) {
        a = [];
        for (k = 0; k < _wma.length; k++) a.push([_wma[k].inputs.get(p.id), _wma[k]]);
        _inputMap[p.id].disconnect();
        for (k = 0; k < a.length; k++) _statechange(a[k][0], a[k][1]);
      }
    }
    for (i = 0; i < x.outputs.removed.length; i++) {
      p = x.outputs.removed[i];
      if (_outputMap.hasOwnProperty(p.id)) {
        a = [];
        for (k = 0; k < _wma.length; k++) a.push([_wma[k].outputs.get(p.id), _wma[k]]);
        _outputMap[p.id].disconnect();
        for (k = 0; k < a.length; k++) _statechange(a[k][0], a[k][1]);
      }
    }
  }

  function MIDIAccess(sysex) {
    var _inputs = {};
    var _outputs = {};
    var _onstatechange = null;
    var self = this;
    this.sysexEnabled = sysex;
    this.inputs = new MIDIInputMap(self, _inputs);
    this.outputs = new MIDIOutputMap(self, _outputs);
    Object.defineProperty(this, 'onstatechange', {
      get: function() { return _onstatechange; },
      set: function(f) { _onstatechange = f instanceof Function ? f : null; },
      enumerable: true
    });
    Object.freeze(this);
    var i;
    var p;
    var info = _jzz._info;
    for (i = 0; i < info.inputs.length; i++) {
      p = info.inputs[i];
      if (!_inputMap.hasOwnProperty(p.id)) _inputMap[p.id] = new _InputProxy(p.id, p.name, p.manufacturer, p.version);
    }
    for (i = 0; i < info.outputs.length; i++) {
      p = info.outputs[i];
      if (!_outputMap.hasOwnProperty(p.id)) _outputMap[p.id] = new _OutputProxy(p.id, p.name, p.manufacturer, p.version);
    }
    if (!_wma.length) JZZ().onChange(_wm_watch);
    _wma.push(this);
  }

  JZZ.requestMIDIAccess = function(opt) {
    return new Promise(function(resolve, reject) {
      JZZ.JZZ(opt).or(function() {
      }).and(function() {
        var sysex = !!(opt && opt.sysex);
        if (sysex && !this.info().sysex) reject(new DOMException('SecurityError', 'Sysex is not allowed', 18));
        else {
          var wma = new MIDIAccess(sysex);
          resolve(wma);
        }
      });
    });
  };
  if (typeof navigator !== 'undefined' && !navigator.requestMIDIAccess) navigator.requestMIDIAccess = JZZ.requestMIDIAccess;
  JZZ.close = function() { if (_engine._close) _engine._close(); };

  return JZZ;
});