qambi/dist/sample_oscillator.js

MIDI sequencer, loads MIDI files, can record and playback MIDI, uses WebMIDI and WebAudio

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.SampleOscillator = undefined;

var _sample = require('./sample');

var _init_audio = require('./init_audio');

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

var instanceIndex = 0;

var SampleOscillator = exports.SampleOscillator = function (_Sample) {
  _inherits(SampleOscillator, _Sample);

  function SampleOscillator(sampleData, event) {
    _classCallCheck(this, SampleOscillator);

    var _this = _possibleConstructorReturn(this, (SampleOscillator.__proto__ || Object.getPrototypeOf(SampleOscillator)).call(this, sampleData, event));

    _this.id = _this.constructor.name + '_' + instanceIndex++ + '_' + new Date().getTime();

    if (_this.sampleData === -1) {
      // create dummy source
      _this.source = {
        start: function start() {},
        stop: function stop() {},
        connect: function connect() {}
      };
    } else {

      // @TODO add type 'custom' => PeriodicWave
      var type = _this.sampleData.type;
      _this.source = _init_audio.context.createOscillator();

      switch (type) {
        case 'sine':
        case 'square':
        case 'sawtooth':
        case 'triangle':
          _this.source.type = type;
          break;
        default:
          _this.source.type = 'square';
      }
      _this.source.frequency.value = event.frequency;
    }
    _this.output = _init_audio.context.createGain();
    _this.volume = event.data2 / 127;
    _this.output.gain.value = _this.volume;
    _this.source.connect(_this.output);
    //this.output.connect(context.destination)
    return _this;
  }

  return SampleOscillator;
}(_sample.Sample);