videojs-contrib-hls/es5/rendition-mixin.js

Play back HLS with video.js, even where it's not natively supported

/**
 * Enable/disable playlist function. It is intended to have the first two
 * arguments partially-applied in order to create the final per-playlist
 * function.
 *
 * @param {PlaylistLoader} playlist - The rendition or media-playlist
 * @param {Function} changePlaylistFn - A function to be called after a
 * playlist's enabled-state has been changed. Will NOT be called if a
 * playlist's enabled-state is unchanged
 * @param {Boolean=} enable - Value to set the playlist enabled-state to
 * or if undefined returns the current enabled-state for the playlist
 * @return {Boolean} The current enabled-state of the playlist
 */
'use strict';

Object.defineProperty(exports, '__esModule', {
  value: true
});

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

var enableFunction = function enableFunction(playlist, changePlaylistFn, enable) {
  var currentlyEnabled = typeof playlist.excludeUntil === 'undefined' || playlist.excludeUntil <= Date.now();

  if (typeof enable === 'undefined') {
    return currentlyEnabled;
  }

  if (enable !== currentlyEnabled) {
    if (enable) {
      delete playlist.excludeUntil;
    } else {
      playlist.excludeUntil = Infinity;
    }

    // Ensure the outside world knows about our changes
    changePlaylistFn();
  }

  return enable;
};

/**
 * The representation object encapsulates the publicly visible information
 * in a media playlist along with a setter/getter-type function (enabled)
 * for changing the enabled-state of a particular playlist entry
 *
 * @class Representation
 */

var Representation = function Representation(hlsHandler, playlist, id) {
  _classCallCheck(this, Representation);

  // Get a reference to a bound version of fastQualityChange_
  var fastChangeFunction = hlsHandler.masterPlaylistController_.fastQualityChange_.bind(hlsHandler.masterPlaylistController_);

  // Carefully descend into the playlist's attributes since most
  // properties are optional
  if (playlist.attributes) {
    var attributes = playlist.attributes;

    if (attributes.RESOLUTION) {
      var resolution = attributes.RESOLUTION;

      this.width = resolution.width;
      this.height = resolution.height;
    }

    this.bandwidth = attributes.BANDWIDTH;
  }

  // The id is simply the ordinality of the media playlist
  // within the master playlist
  this.id = id;

  // Partially-apply the enableFunction to create a playlist-
  // specific variant
  this.enabled = enableFunction.bind(this, playlist, fastChangeFunction);
}

/**
 * A mixin function that adds the `representations` api to an instance
 * of the HlsHandler class
 * @param {HlsHandler} hlsHandler - An instance of HlsHandler to add the
 * representation API into
 */
;

var renditionSelectionMixin = function renditionSelectionMixin(hlsHandler) {
  var playlists = hlsHandler.playlists;

  // Add a single API-specific function to the HlsHandler instance
  hlsHandler.representations = function () {
    return playlists.master.playlists.map(function (e, i) {
      return new Representation(hlsHandler, e, i);
    });
  };
};

exports['default'] = renditionSelectionMixin;
module.exports = exports['default'];