rendition-mixin.js
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'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 _playlistJs = require('./playlist.js');
/**
* Returns a function that acts as the Enable/disable playlist function.
*
* @param {PlaylistLoader} loader - The master playlist loader
* @param {String} playlistUri - uri of the 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 {Function} Function for setting/getting enabled
*/
var enableFunction = function enableFunction(loader, playlistUri, changePlaylistFn) {
return function (enable) {
var playlist = loader.master.playlists[playlistUri];
var incompatible = (0, _playlistJs.isIncompatible)(playlist);
var currentlyEnabled = (0, _playlistJs.isEnabled)(playlist);
if (typeof enable === 'undefined') {
return currentlyEnabled;
}
if (enable) {
delete playlist.disabled;
} else {
playlist.disabled = true;
}
if (enable !== currentlyEnabled && !incompatible) {
// Ensure the outside world knows about our changes
changePlaylistFn();
if (enable) {
loader.trigger('renditionenabled');
} else {
loader.trigger('renditiondisabled');
}
}
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_);
// some playlist attributes are optional
if (playlist.attributes.RESOLUTION) {
var resolution = playlist.attributes.RESOLUTION;
this.width = resolution.width;
this.height = resolution.height;
}
this.bandwidth = playlist.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(hlsHandler.playlists, playlist.uri, 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.filter(function (media) {
return !(0, _playlistJs.isIncompatible)(media);
}).map(function (e, i) {
return new Representation(hlsHandler, e, e.uri);
});
};
};
exports['default'] = renditionSelectionMixin;
module.exports = exports['default'];