waveform-playlist-nartj/lib/track/loader/Loader.js

Multiple track web audio editor and player with waveform preview

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = exports.STATE_FINISHED = exports.STATE_DECODING = exports.STATE_LOADING = exports.STATE_UNINITIALIZED = void 0;

var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));

var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));

var _eventEmitter = _interopRequireDefault(require("event-emitter"));

var STATE_UNINITIALIZED = 0;
exports.STATE_UNINITIALIZED = STATE_UNINITIALIZED;
var STATE_LOADING = 1;
exports.STATE_LOADING = STATE_LOADING;
var STATE_DECODING = 2;
exports.STATE_DECODING = STATE_DECODING;
var STATE_FINISHED = 3;
exports.STATE_FINISHED = STATE_FINISHED;

var _default = /*#__PURE__*/function () {
  function _default(src, audioContext) {
    var ee = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : (0, _eventEmitter["default"])();
    (0, _classCallCheck2["default"])(this, _default);
    this.src = src;
    this.ac = audioContext;
    this.audioRequestState = STATE_UNINITIALIZED;
    this.ee = ee;
  }

  (0, _createClass2["default"])(_default, [{
    key: "setStateChange",
    value: function setStateChange(state) {
      this.audioRequestState = state;
      this.ee.emit('audiorequeststatechange', this.audioRequestState, this.src);
    }
  }, {
    key: "fileProgress",
    value: function fileProgress(e) {
      var percentComplete = 0;

      if (this.audioRequestState === STATE_UNINITIALIZED) {
        this.setStateChange(STATE_LOADING);
      }

      if (e.lengthComputable) {
        percentComplete = e.loaded / e.total * 100;
      }

      this.ee.emit('loadprogress', percentComplete, this.src);
    }
  }, {
    key: "fileLoad",
    value: function fileLoad(e) {
      var _this = this;

      var audioData = e.target.response || e.target.result;
      this.setStateChange(STATE_DECODING);
      return new Promise(function (resolve, reject) {
        _this.ac.decodeAudioData(audioData, function (audioBuffer) {
          _this.audioBuffer = audioBuffer;

          _this.setStateChange(STATE_FINISHED);

          resolve(audioBuffer);
        }, function (err) {
          if (err === null) {
            // Safari issues with null error
            reject(Error('MediaDecodeAudioDataUnknownContentType'));
          } else {
            reject(err);
          }
        });
      });
    }
  }]);
  return _default;
}();

exports["default"] = _default;