qambi/dist/channel_fx.js

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

'use strict';

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

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

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

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

var ChannelEffect = exports.ChannelEffect = function () {
  function ChannelEffect() {
    _classCallCheck(this, ChannelEffect);

    this.input = _init_audio.context.createGain();
    this.output = _init_audio.context.createGain();

    this._dry = _init_audio.context.createGain();
    this._wet = _init_audio.context.createGain();

    this._dry.gain.value = 1;
    this._wet.gain.value = 0;

    this.amount = 0;
  }

  _createClass(ChannelEffect, [{
    key: 'init',
    value: function init() {
      this.input.connect(this._dry);
      this._dry.connect(this.output);

      this.input.connect(this._nodeFX);
      this._nodeFX.connect(this._wet);
      this._wet.connect(this.output);
    }
  }, {
    key: 'setAmount',
    value: function setAmount(value) {
      /*
      this.amount = value < 0 ? 0 : value > 1 ? 1 : value;
      var gain1 = Math.cos(this.amount * 0.5 * Math.PI),
          gain2 = Math.cos((1.0 - this.amount) * 0.5 * Math.PI);
      this.gainNode.gain.value = gain2 * this.ratio;
      */

      if (value < 0) {
        value = 0;
      } else if (value > 1) {
        value = 1;
      }

      this.amount = value;
      this._wet.gain.value = this.amount;
      this._dry.gain.value = 1 - this.amount;
      //console.log('wet',this.wetGain.gain.value,'dry',this.dryGain.gain.value);
    }
  }]);

  return ChannelEffect;
}();