mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-16 16:16:40 +03:00
Joey Parrish
c7e73e0115
This change creates a new model which divides DASH streams into VOD, IPR, and live. It is possible to create manifests which do not fit into any of the three categories according to our model, so we now assert that our input fits cleanly into one of the three. Inline manifests used in our tests had to be updated to conform to the new model. All external test assets have been verified to fit into these categories. This is phase 1 of IPR support. There should be no behavior change in this CL. In phase 2, we will make various other parts of the library aware of IPR so that IPR-specific behaviors can be achieved. Issue #477 Change-Id: I395d3a0c8c9825a3cd2efde263b8493ce0920ed9
1353 lines
43 KiB
JavaScript
1353 lines
43 KiB
JavaScript
/**
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* @license
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* Copyright 2016 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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goog.provide('shaka.dash.DashParser');
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goog.require('goog.asserts');
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goog.require('shaka.dash.ContentProtection');
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goog.require('shaka.dash.MpdUtils');
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goog.require('shaka.dash.SegmentBase');
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goog.require('shaka.dash.SegmentList');
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goog.require('shaka.dash.SegmentTemplate');
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goog.require('shaka.log');
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goog.require('shaka.media.ManifestParser');
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goog.require('shaka.media.PresentationTimeline');
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goog.require('shaka.media.SegmentReference');
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goog.require('shaka.media.TextEngine');
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goog.require('shaka.net.NetworkingEngine');
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goog.require('shaka.util.DataViewReader');
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goog.require('shaka.util.Error');
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goog.require('shaka.util.FakeEvent');
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goog.require('shaka.util.Functional');
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goog.require('shaka.util.LanguageUtils');
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goog.require('shaka.util.MapUtils');
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goog.require('shaka.util.Mp4Parser');
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goog.require('shaka.util.MultiMap');
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goog.require('shaka.util.StringUtils');
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goog.require('shaka.util.XmlUtils');
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/**
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* Creates a new DASH parser.
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*
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* @struct
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* @constructor
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* @implements {shakaExtern.ManifestParser}
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*/
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shaka.dash.DashParser = function() {
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/** @private {shaka.net.NetworkingEngine} */
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this.networkingEngine_ = null;
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/** @private {?shakaExtern.ManifestConfiguration} */
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this.config_ = null;
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/** @private {?function(shakaExtern.Period)} */
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this.filterPeriod_ = null;
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/** @private {?function(!shaka.util.Error)} */
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this.onError_ = null;
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/** @private {?function(!shaka.util.FakeEvent)} */
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this.onEvent_ = null;
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/** @private {!Array.<string>} */
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this.manifestUris_ = [];
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/** @private {?shakaExtern.Manifest} */
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this.manifest_ = null;
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/** @private {!Array.<string>} */
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this.periodIds_ = [];
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/** @private {number} */
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this.globalId_ = 1;
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/**
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* A map of IDs to SegmentIndex objects.
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* ID: Period@id,AdaptationSet@id,@Representation@id
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* e.g.: '1,5,23'
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* @private {!Object.<string, !shaka.media.SegmentIndex>}
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*/
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this.segmentIndexMap_ = {};
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/**
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* The update period in seconds; or 0 for no updates.
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* @private {number}
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*/
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this.updatePeriod_ = 0;
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/** @private {?number} */
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this.updateTimer_ = null;
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/** @private {!shaka.net.NetworkingEngine.ResponseFilter} */
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this.emsgResponseFilter_ = this.emsgResponseFilter_.bind(this);
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};
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/**
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* Contains the minimum amount of time, in seconds, between manifest update
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* requests.
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*
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* @private
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* @const {number}
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*/
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shaka.dash.DashParser.MIN_UPDATE_PERIOD_ = 3;
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/**
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* The default MPD@suggestedPresentationDelay in seconds.
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*
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* @private
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* @const {number}
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*/
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shaka.dash.DashParser.DEFAULT_SUGGESTED_PRESENTATION_DELAY_ = 5;
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/**
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* @typedef {
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* !function(!Array.<string>, ?number, ?number):!Promise.<!ArrayBuffer>
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* }
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*/
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shaka.dash.DashParser.RequestInitSegmentCallback;
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/**
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* @typedef {{
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* segmentBase: Element,
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* segmentList: Element,
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* segmentTemplate: Element,
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* baseUris: !Array.<string>,
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* width: (number|undefined),
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* height: (number|undefined),
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* contentType: string,
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* mimeType: string,
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* codecs: string,
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* id: string
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* }}
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*
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* @description
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* A collection of elements and properties which are inherited across levels
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* of a DASH manifest.
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*
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* @property {Element} segmentBase
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* The XML node for SegmentBase.
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* @property {Element} segmentList
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* The XML node for SegmentList.
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* @property {Element} segmentTemplate
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* The XML node for SegmentTemplate.
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* @property {!Array.<string>} baseUris
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* An array of absolute base URIs for the frame.
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* @property {(number|undefined)} width
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* The inherited width value.
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* @property {(number|undefined)} height
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* The inherited height value.
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* @property {string} contentType
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* The inherited media type.
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* @property {string} mimeType
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* The inherited MIME type value.
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* @property {string} codecs
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* The inherited codecs value.
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* @property {string} id
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* The ID of the element.
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*/
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shaka.dash.DashParser.InheritanceFrame;
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/**
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* @typedef {{
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* presentationTimeline: !shaka.media.PresentationTimeline,
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* period: ?shaka.dash.DashParser.InheritanceFrame,
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* periodInfo: ?shaka.dash.DashParser.PeriodInfo,
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* adaptationSet: ?shaka.dash.DashParser.InheritanceFrame,
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* representation: ?shaka.dash.DashParser.InheritanceFrame,
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* bandwidth: (number|undefined)
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* }}
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*
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* @description
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* Contains context data for the streams.
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*
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* @property {!shaka.media.PresentationTimeline} presentationTimeline
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* The PresentationTimeline.
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* @property {?shaka.dash.DashParser.InheritanceFrame} period
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* The inheritance from the Period element.
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* @property {?shaka.dash.DashParser.PeriodInfo} periodInfo
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* The Period info for the current Period.
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* @property {?shaka.dash.DashParser.InheritanceFrame} adaptationSet
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* The inheritance from the AdaptationSet element.
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* @property {?shaka.dash.DashParser.InheritanceFrame} representation
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* The inheritance from the Representation element.
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* @property {(number|undefined)} bandwidth
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* The bandwidth of the Representation.
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*/
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shaka.dash.DashParser.Context;
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/**
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* @typedef {{
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* start: number,
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* duration: ?number,
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* node: !Element,
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* containsInband: boolean
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* }}
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*
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* @description
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* Contains information about a Period element.
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*
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* @property {number} start
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* The start time of the period.
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* @property {?number} duration
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* The duration of the period; or null if the duration is not given. This
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* will be non-null for all periods except the last.
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* @property {!Element} node
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* The XML Node for the Period.
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* @property {boolean} containsInband
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* Indicates whether a period contains inband information.
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*/
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shaka.dash.DashParser.PeriodInfo;
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/**
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* @typedef {{
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* id: string,
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* contentType: ?string,
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* language: string,
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* main: boolean,
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* streams: !Array.<shakaExtern.Stream>,
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* drmInfos: !Array.<shakaExtern.DrmInfo>,
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* switchableIds: !Array.<string>,
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* containsInband: boolean
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* }}
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*
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* @description
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* Contains information about an AdaptationSet element.
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*
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* @property {string} id
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* The unique ID of the adaptation set.
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* @property {?string} contentType
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* The content type of the AdaptationSet.
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* @property {string} language
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* The language of the AdaptationSet.
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* @property {boolean} main
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* Whether the AdaptationSet has the 'main' type.
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* @property {!Array.<shakaExtern.Stream>} streams
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* The streams this AdaptationSet contains.
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* @property {!Array.<shakaExtern.DrmInfo>} drmInfos
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* The DRM info for the AdaptationSet.
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* @property {!Array.<string>} switchableIds
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* An array of the IDs of the AdaptationSets it can switch to.
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* @property {boolean} containsInband
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* Signals whether AdaptationSet has inband content indicator on it.
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*/
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shaka.dash.DashParser.AdaptationInfo;
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/**
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* @typedef {{
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* createSegmentIndex: shakaExtern.CreateSegmentIndexFunction,
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* findSegmentPosition: shakaExtern.FindSegmentPositionFunction,
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* getSegmentReference: shakaExtern.GetSegmentReferenceFunction
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* }}
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*
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* @description
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* Contains functions used to create and find segment references.
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*
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* @property {shakaExtern.CreateSegmentIndexFunction} createSegmentIndex
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* The createSegmentIndex function.
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* @property {shakaExtern.FindSegmentPositionFunction} findSegmentPosition
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* The findSegmentPosition function.
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* @property {shakaExtern.GetSegmentReferenceFunction} getSegmentReference
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* The getSegmentReference function.
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*/
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shaka.dash.DashParser.SegmentIndexFunctions;
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/**
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* @typedef {{
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* createSegmentIndex: shakaExtern.CreateSegmentIndexFunction,
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* findSegmentPosition: shakaExtern.FindSegmentPositionFunction,
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* getSegmentReference: shakaExtern.GetSegmentReferenceFunction,
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* initSegmentReference: shaka.media.InitSegmentReference,
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* presentationTimeOffset: (number|undefined)
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* }}
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*
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* @description
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* Contains information about a Stream. This is passed from the createStream
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* methods.
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*
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* @property {shakaExtern.CreateSegmentIndexFunction} createSegmentIndex
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* The createSegmentIndex function for the stream.
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* @property {shakaExtern.FindSegmentPositionFunction} findSegmentPosition
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* The findSegmentPosition function for the stream.
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* @property {shakaExtern.GetSegmentReferenceFunction} getSegmentReference
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* The getSegmentReference function for the stream.
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* @property {shaka.media.InitSegmentReference} initSegmentReference
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* The init segment for the stream.
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* @property {(number|undefined)} presentationTimeOffset
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* The presentationTimeOffset for the stream.
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*/
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shaka.dash.DashParser.StreamInfo;
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/**
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* @typedef {{
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* schemeIdUri: string,
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* value: string,
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* timescale: number,
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* presentationTimeDelta: number,
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* eventDuration: number,
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* id: number,
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* messageData: Uint8Array
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* }}
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*
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* @description
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* Contains information about an EMSG MP4 box.
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*
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* @property {string} schemeIdUri
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* Identifies the message scheme.
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* @property {string} value
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* Specifies the value for the event.
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* @property {number} timescale
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* Provides the timescale, in ticks per second,
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* for the time and duration fields within this box.
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* @property {number} presentationTimeDelta
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* Provides the Media Presentation time delta of the media presentation
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* time of the event and the earliest presentation time in this segment.
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* @property {number} eventDuration
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* Provides the duration of event in media presentation time.
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* @property {number} id
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* A field identifying this instance of the message.
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* @property {Uint8Array} messageData
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* Body of the message.
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* @exportDoc
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*/
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shaka.dash.DashParser.EmsgInfo;
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/** @override */
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shaka.dash.DashParser.prototype.configure = function(config) {
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this.config_ = config;
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};
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/** @override */
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shaka.dash.DashParser.prototype.start =
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function(uri, networkingEngine, filterPeriod, onError, onEvent) {
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goog.asserts.assert(this.config_, 'Must call configure() before start()!');
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this.manifestUris_ = [uri];
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this.networkingEngine_ = networkingEngine;
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this.filterPeriod_ = filterPeriod;
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this.onError_ = onError;
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this.onEvent_ = onEvent;
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return this.requestManifest_().then(function() {
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if (this.networkingEngine_)
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this.setUpdateTimer_(0);
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return this.manifest_;
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}.bind(this));
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};
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/** @override */
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shaka.dash.DashParser.prototype.stop = function() {
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if (this.networkingEngine_)
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this.networkingEngine_.unregisterResponseFilter(this.emsgResponseFilter_);
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this.networkingEngine_ = null;
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this.filterPeriod_ = null;
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this.onError_ = null;
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this.onEvent_ = null;
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this.config_ = null;
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this.manifestUris_ = [];
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this.manifest_ = null;
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this.periodIds_ = [];
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this.segmentIndexMap_ = {};
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if (this.updateTimer_ != null) {
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window.clearTimeout(this.updateTimer_);
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this.updateTimer_ = null;
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}
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return Promise.resolve();
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};
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/**
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* Makes a network request for the manifest and parses the resulting data.
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*
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* @return {!Promise}
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* @private
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*/
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shaka.dash.DashParser.prototype.requestManifest_ = function() {
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var requestType = shaka.net.NetworkingEngine.RequestType.MANIFEST;
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var request = shaka.net.NetworkingEngine.makeRequest(
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this.manifestUris_, this.config_.retryParameters);
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return this.networkingEngine_.request(requestType, request)
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.then(function(response) {
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// Detect calls to stop().
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if (!this.networkingEngine_)
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return;
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// This may throw; but it will result in a failed promise.
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return this.parseManifest_(response.data, response.uri);
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}.bind(this));
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};
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/**
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* Parses the manifest XML. This also handles updates and will update the
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* stored manifest.
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*
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* @param {!ArrayBuffer} data
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* @param {string} finalManifestUri The final manifest URI, which may
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* differ from this.manifestUri_ if there has been a redirect.
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* @return {!Promise}
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* @throws shaka.util.Error When there is a parsing error.
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* @private
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*/
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shaka.dash.DashParser.prototype.parseManifest_ =
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function(data, finalManifestUri) {
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var Error = shaka.util.Error;
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var Functional = shaka.util.Functional;
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var XmlUtils = shaka.util.XmlUtils;
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var string = shaka.util.StringUtils.fromUTF8(data);
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var parser = new DOMParser();
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var xml = null;
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var mpd = null;
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try {
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xml = parser.parseFromString(string, 'text/xml');
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} catch (exception) {}
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if (xml) {
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// parseFromString returns a Document object. A Document is a Node but not
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// an Element, so it cannot be used in XmlUtils (technically it can but the
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// types don't match). The |documentElement| member defines the top-level
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// element in the document.
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if (xml.documentElement.tagName == 'MPD')
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mpd = xml.documentElement;
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}
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if (!mpd) {
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throw new Error(Error.Category.MANIFEST, Error.Code.DASH_INVALID_XML);
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}
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// Get any Location elements. This will update the manifest location and
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// the base URI.
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/** @type {!Array.<string>} */
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var manifestBaseUris = [finalManifestUri];
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/** @type {!Array.<string>} */
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var locations = XmlUtils.findChildren(mpd, 'Location')
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.map(XmlUtils.getContents)
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.filter(Functional.isNotNull);
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if (locations.length > 0) {
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this.manifestUris_ = locations;
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manifestBaseUris = locations;
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}
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var uris = XmlUtils.findChildren(mpd, 'BaseURL').map(XmlUtils.getContents);
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var baseUris = shaka.dash.MpdUtils.resolveUris(manifestBaseUris, uris);
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var minBufferTime =
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XmlUtils.parseAttr(mpd, 'minBufferTime', XmlUtils.parseDuration);
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this.updatePeriod_ = /** @type {number} */ (XmlUtils.parseAttr(
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mpd, 'minimumUpdatePeriod', XmlUtils.parseDuration, -1));
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var presentationStartTime = XmlUtils.parseAttr(
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mpd, 'availabilityStartTime', XmlUtils.parseDate);
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var segmentAvailabilityDuration = XmlUtils.parseAttr(
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mpd, 'timeShiftBufferDepth', XmlUtils.parseDuration);
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var suggestedPresentationDelay = XmlUtils.parseAttr(
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mpd, 'suggestedPresentationDelay', XmlUtils.parseDuration);
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var maxSegmentDuration = XmlUtils.parseAttr(
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mpd, 'maxSegmentDuration', XmlUtils.parseDuration);
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var mpdType = mpd.getAttribute('type') || 'static';
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var presentationTimeline;
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if (this.manifest_) {
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presentationTimeline = this.manifest_.presentationTimeline;
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} else {
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var presentationDelay = suggestedPresentationDelay != null ?
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suggestedPresentationDelay :
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shaka.dash.DashParser.DEFAULT_SUGGESTED_PRESENTATION_DELAY_;
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presentationTimeline = new shaka.media.PresentationTimeline(
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presentationStartTime, presentationDelay);
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}
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/** @type {shaka.dash.DashParser.Context} */
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var context = {
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presentationTimeline: presentationTimeline,
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period: null,
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periodInfo: null,
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adaptationSet: null,
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representation: null,
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bandwidth: undefined
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};
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var periodsAndDuration = this.parsePeriods_(context, baseUris, mpd);
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var duration = periodsAndDuration.duration;
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var periods = periodsAndDuration.periods;
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presentationTimeline.setStatic(mpdType == 'static');
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presentationTimeline.setDuration(duration || Number.POSITIVE_INFINITY);
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presentationTimeline.setSegmentAvailabilityDuration(
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segmentAvailabilityDuration != null ?
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segmentAvailabilityDuration :
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Number.POSITIVE_INFINITY);
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// Use @maxSegmentDuration to override smaller, derived values.
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|
presentationTimeline.notifyMaxSegmentDuration(maxSegmentDuration || 1);
|
|
if (!COMPILED) presentationTimeline.assertIsValid();
|
|
|
|
if (this.manifest_) {
|
|
// This is a manifest update, so we're done.
|
|
return Promise.resolve();
|
|
}
|
|
|
|
// This is the first manifest parse, so we cannot return until we calculate
|
|
// the clock offset.
|
|
var timingElements = XmlUtils.findChildren(mpd, 'UTCTiming');
|
|
|
|
var isLive = presentationTimeline.isLive();
|
|
|
|
// if any of the periods had an emsg box indicator,
|
|
// register a response filter to look for an EMSG box in segments
|
|
if (periodsAndDuration.containsInband)
|
|
this.networkingEngine_.registerResponseFilter(this.emsgResponseFilter_);
|
|
|
|
return this.parseUtcTiming_(
|
|
baseUris, timingElements, isLive).then(function(offset) {
|
|
// Detect calls to stop().
|
|
if (!this.networkingEngine_)
|
|
return;
|
|
|
|
presentationTimeline.setClockOffset(offset);
|
|
|
|
this.manifest_ = {
|
|
presentationTimeline: presentationTimeline,
|
|
periods: periods,
|
|
offlineSessionIds: [],
|
|
minBufferTime: minBufferTime || 0
|
|
};
|
|
}.bind(this));
|
|
};
|
|
|
|
|
|
/**
|
|
* Reads and parses the periods from the manifest. This first does some
|
|
* partial parsing so the start and duration is available when parsing children.
|
|
*
|
|
* @param {shaka.dash.DashParser.Context} context
|
|
* @param {!Array.<string>} baseUris
|
|
* @param {!Element} mpd
|
|
* @return {{periods: !Array.<shakaExtern.Period>,
|
|
* duration: ?number, containsInband: boolean}}
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.parsePeriods_ = function(
|
|
context, baseUris, mpd) {
|
|
var Functional = shaka.util.Functional;
|
|
var XmlUtils = shaka.util.XmlUtils;
|
|
var presentationDuration = XmlUtils.parseAttr(
|
|
mpd, 'mediaPresentationDuration', XmlUtils.parseDuration);
|
|
|
|
var periods = [];
|
|
var prevEnd = 0;
|
|
var periodNodes = XmlUtils.findChildren(mpd, 'Period');
|
|
for (var i = 0; i < periodNodes.length; i++) {
|
|
var elem = periodNodes[i];
|
|
var start = /** @type {number} */ (
|
|
XmlUtils.parseAttr(elem, 'start', XmlUtils.parseDuration, prevEnd));
|
|
var periodDuration =
|
|
XmlUtils.parseAttr(elem, 'duration', XmlUtils.parseDuration);
|
|
|
|
if (periodDuration == null) {
|
|
if (i + 1 != periodNodes.length) {
|
|
// "The difference between the start time of a Period and the start time
|
|
// of the following Period is the duration of the media content
|
|
// represented by this Period."
|
|
var nextPeriod = periodNodes[i + 1];
|
|
var nextStart =
|
|
XmlUtils.parseAttr(nextPeriod, 'start', XmlUtils.parseDuration);
|
|
if (nextStart != null)
|
|
periodDuration = nextStart - start;
|
|
} else if (presentationDuration != null) {
|
|
// "The Period extends until the Period.start of the next Period, or
|
|
// until the end of the Media Presentation in the case of the last
|
|
// Period."
|
|
periodDuration = presentationDuration - start;
|
|
}
|
|
}
|
|
|
|
// Parse child nodes.
|
|
var info = {
|
|
start: start,
|
|
duration: periodDuration,
|
|
node: elem,
|
|
containsInband: false
|
|
};
|
|
var period = this.parsePeriod_(context, baseUris, info);
|
|
periods.push(period);
|
|
|
|
// If there are any new periods, call the callback and add them to the
|
|
// manifest. If this is the first parse, it will see all of them as new.
|
|
var periodId = context.period.id;
|
|
if (this.periodIds_.every(Functional.isNotEqualFunc(periodId))) {
|
|
this.filterPeriod_(period);
|
|
this.periodIds_.push(periodId);
|
|
if (this.manifest_)
|
|
this.manifest_.periods.push(period);
|
|
}
|
|
|
|
if (periodDuration == null) {
|
|
if (i + 1 != periodNodes.length) {
|
|
// If the duration is still null and we aren't at the end, then we will
|
|
// skip any remaining periods.
|
|
shaka.log.warning(
|
|
'Skipping Period', i + 1, 'and any subsequent Periods:', 'Period',
|
|
i + 1, 'does not have a valid start time.', periods[i + 1]);
|
|
}
|
|
|
|
// The duration is unknown, so the end is unknown.
|
|
prevEnd = null;
|
|
break;
|
|
}
|
|
|
|
prevEnd = start + periodDuration;
|
|
}
|
|
|
|
if (presentationDuration != null) {
|
|
if (prevEnd != presentationDuration) {
|
|
shaka.log.warning(
|
|
'@mediaPresentationDuration does not match the total duration of all',
|
|
'Periods.');
|
|
// Assume @mediaPresentationDuration is correct.
|
|
}
|
|
return {
|
|
periods: periods,
|
|
duration: presentationDuration,
|
|
containsInband: info.containsInband
|
|
};
|
|
} else {
|
|
return {
|
|
periods: periods,
|
|
duration: prevEnd,
|
|
containsInband: info.containsInband
|
|
};
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Parses a Period XML element. Unlike the other parse methods, this is not
|
|
* given the Node; it is given a PeriodInfo structure. Also, partial parsing
|
|
* was done before this was called so start and duration are valid.
|
|
*
|
|
* @param {shaka.dash.DashParser.Context} context
|
|
* @param {!Array.<string>} baseUris
|
|
* @param {shaka.dash.DashParser.PeriodInfo} periodInfo
|
|
* @return {shakaExtern.Period}
|
|
* @throws shaka.util.Error When there is a parsing error.
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.parsePeriod_ = function(
|
|
context, baseUris, periodInfo) {
|
|
var XmlUtils = shaka.util.XmlUtils;
|
|
context.period = this.createFrame_(periodInfo.node, null, baseUris);
|
|
context.periodInfo = periodInfo;
|
|
|
|
// If the period doesn't have an ID, give it one based on its start time.
|
|
if (!context.period.id) {
|
|
shaka.log.info(
|
|
'No Period ID given for Period with start time ' + periodInfo.start +
|
|
', Assigning a default');
|
|
context.period.id = '__shaka_period_' + periodInfo.start;
|
|
}
|
|
|
|
var adaptationSetNodes =
|
|
XmlUtils.findChildren(periodInfo.node, 'AdaptationSet');
|
|
var adaptationSets =
|
|
adaptationSetNodes.map(this.parseAdaptationSet_.bind(this, context));
|
|
|
|
if (adaptationSets.length == 0) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.DASH_EMPTY_PERIOD);
|
|
}
|
|
|
|
// see if any adaptation set has emsg indicator on it.
|
|
// If it does, we'll register a response filter later.
|
|
for (var i = 0; i < adaptationSets.length; i++) {
|
|
if (adaptationSets[i].containsInband) {
|
|
periodInfo.containsInband = true;
|
|
}
|
|
}
|
|
|
|
var streamSets = this.createStreamSets_(adaptationSets);
|
|
return {startTime: periodInfo.start, streamSets: streamSets};
|
|
};
|
|
|
|
|
|
/**
|
|
* Parses an AdaptationSet XML element.
|
|
*
|
|
* @param {shaka.dash.DashParser.Context} context
|
|
* @param {!Element} elem The AdaptationSet element.
|
|
* @return {shaka.dash.DashParser.AdaptationInfo}
|
|
* @throws shaka.util.Error When there is a parsing error.
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.parseAdaptationSet_ = function(context, elem) {
|
|
var XmlUtils = shaka.util.XmlUtils;
|
|
context.adaptationSet = this.createFrame_(elem, context.period, null);
|
|
|
|
var main = false;
|
|
var role = XmlUtils.findChild(elem, 'Role');
|
|
|
|
// Default kind for text streams is 'subtitle' if unspecified in the manifest.
|
|
var kind = undefined;
|
|
if (context.adaptationSet.contentType == 'text') kind = 'subtitle';
|
|
|
|
if (role) {
|
|
var scheme = role.getAttribute('schemeIdUri');
|
|
if (scheme == null || scheme == 'urn:mpeg:dash:role:2011') {
|
|
// These only apply for the given scheme, but allow them to be specified
|
|
// if there is no scheme specified.
|
|
// See: DASH section 5.8.5.5
|
|
var value = role.getAttribute('value');
|
|
switch (value) {
|
|
case 'main':
|
|
main = true;
|
|
break;
|
|
case 'caption':
|
|
case 'subtitle':
|
|
kind = value;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// InbandEventStream indicates that a segment contains inband
|
|
// information.
|
|
var eventStream = XmlUtils.findChild(elem, 'InbandEventStream');
|
|
var containsInband = eventStream != null;
|
|
|
|
var supplementalProperties =
|
|
XmlUtils.findChildren(elem, 'SupplementalProperty');
|
|
var switchableIds = [];
|
|
supplementalProperties.forEach(function(prop) {
|
|
var schemeId = prop.getAttribute('schemeIdURI');
|
|
if (schemeId == 'http://dashif.org/descriptor/AdaptationSetSwitching') {
|
|
var value = prop.getAttribute('value');
|
|
if (value)
|
|
switchableIds.push.apply(switchableIds, value.split(','));
|
|
}
|
|
});
|
|
|
|
var contentProtectionElems = XmlUtils.findChildren(elem, 'ContentProtection');
|
|
var contentProtection = shaka.dash.ContentProtection.parseFromAdaptationSet(
|
|
contentProtectionElems, this.config_.dash.customScheme);
|
|
|
|
var language =
|
|
shaka.util.LanguageUtils.normalize(elem.getAttribute('lang') || 'und');
|
|
|
|
// Parse Representations into Streams.
|
|
var streams = XmlUtils.findChildren(elem, 'Representation')
|
|
.map(this.parseRepresentation_.bind(
|
|
this, context, contentProtection, kind, language))
|
|
.filter(function(s) { return !!s; });
|
|
|
|
if (streams.length == 0) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.DASH_EMPTY_ADAPTATION_SET);
|
|
}
|
|
|
|
if (!context.adaptationSet.contentType) {
|
|
// Guess the AdaptationSet's content type.
|
|
var mimeType = streams[0].mimeType;
|
|
var codecs = streams[0].codecs;
|
|
var fullMimeType = mimeType;
|
|
if (codecs) {
|
|
fullMimeType += '; codecs="' + codecs + '"';
|
|
}
|
|
|
|
if (shaka.media.TextEngine.isTypeSupported(fullMimeType)) {
|
|
// If it's supported by TextEngine, it's definitely text.
|
|
// We don't check MediaSourceEngine, because that would report support
|
|
// for platform-supported video and audio types as well.
|
|
context.adaptationSet.contentType = 'text';
|
|
} else {
|
|
// Otherwise, just split the MIME type. This handles video and audio
|
|
// types well.
|
|
context.adaptationSet.contentType = mimeType.split('/')[0];
|
|
}
|
|
}
|
|
|
|
return {
|
|
id: context.adaptationSet.id || ('__fake__' + this.globalId_++),
|
|
contentType: context.adaptationSet.contentType,
|
|
language: language,
|
|
main: main,
|
|
streams: streams,
|
|
drmInfos: contentProtection.drmInfos,
|
|
switchableIds: switchableIds,
|
|
containsInband: containsInband
|
|
};
|
|
};
|
|
|
|
|
|
/**
|
|
* Parses a Representation XML element.
|
|
*
|
|
* @param {shaka.dash.DashParser.Context} context
|
|
* @param {shaka.dash.ContentProtection.Context} contentProtection
|
|
* @param {(string|undefined)} kind
|
|
* @param {string} language
|
|
* @param {!Element} node
|
|
* @return {?shakaExtern.Stream} The Stream, or null when there is a
|
|
* non-critical parsing error.
|
|
* @throws shaka.util.Error When there is a parsing error.
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.parseRepresentation_ = function(
|
|
context, contentProtection, kind, language, node) {
|
|
var XmlUtils = shaka.util.XmlUtils;
|
|
|
|
context.representation = this.createFrame_(node, context.adaptationSet, null);
|
|
if (!this.verifyRepresentation_(context.representation)) {
|
|
shaka.log.warning('Skipping Representation', context.representation);
|
|
return null;
|
|
}
|
|
|
|
context.bandwidth =
|
|
XmlUtils.parseAttr(node, 'bandwidth', XmlUtils.parsePositiveInt) ||
|
|
undefined;
|
|
|
|
/** @type {?shaka.dash.DashParser.StreamInfo} */
|
|
var streamInfo;
|
|
var requestInitSegment = this.requestInitSegment_.bind(this);
|
|
if (context.representation.segmentBase) {
|
|
streamInfo = shaka.dash.SegmentBase.createStream(
|
|
context, requestInitSegment);
|
|
} else if (context.representation.segmentList) {
|
|
streamInfo = shaka.dash.SegmentList.createStream(
|
|
context, this.segmentIndexMap_);
|
|
} else if (context.representation.segmentTemplate) {
|
|
streamInfo = shaka.dash.SegmentTemplate.createStream(
|
|
context, requestInitSegment, this.segmentIndexMap_, !!this.manifest_);
|
|
} else {
|
|
goog.asserts.assert(context.representation.contentType == 'text' ||
|
|
context.representation.contentType == 'application',
|
|
'Must have Segment* with non-text streams.');
|
|
|
|
var baseUris = context.representation.baseUris;
|
|
var duration = context.periodInfo.duration || 0;
|
|
streamInfo = {
|
|
createSegmentIndex: Promise.resolve.bind(Promise),
|
|
findSegmentPosition:
|
|
/** @return {?number} */ function(/** number */ time) {
|
|
if (time >= 0 && time < duration)
|
|
return 1;
|
|
else
|
|
return null;
|
|
},
|
|
getSegmentReference:
|
|
/** @return {shaka.media.SegmentReference} */
|
|
function(/** number */ ref) {
|
|
if (ref != 1)
|
|
return null;
|
|
|
|
return new shaka.media.SegmentReference(
|
|
1, 0, duration, function() { return baseUris; }, 0, null);
|
|
},
|
|
initSegmentReference: null,
|
|
presentationTimeOffset: 0
|
|
};
|
|
}
|
|
|
|
var contentProtectionElems = XmlUtils.findChildren(node, 'ContentProtection');
|
|
var keyId = shaka.dash.ContentProtection.parseFromRepresentation(
|
|
contentProtectionElems, this.config_.dash.customScheme,
|
|
contentProtection);
|
|
|
|
return {
|
|
id: this.globalId_++,
|
|
createSegmentIndex: streamInfo.createSegmentIndex,
|
|
findSegmentPosition: streamInfo.findSegmentPosition,
|
|
getSegmentReference: streamInfo.getSegmentReference,
|
|
initSegmentReference: streamInfo.initSegmentReference,
|
|
presentationTimeOffset: streamInfo.presentationTimeOffset,
|
|
mimeType: context.representation.mimeType,
|
|
codecs: context.representation.codecs,
|
|
bandwidth: context.bandwidth,
|
|
width: context.representation.width,
|
|
height: context.representation.height,
|
|
kind: kind,
|
|
encrypted: contentProtection.drmInfos.length > 0,
|
|
keyId: keyId,
|
|
language: language,
|
|
allowedByApplication: true,
|
|
allowedByKeySystem: true
|
|
};
|
|
};
|
|
|
|
|
|
/**
|
|
* Called when the update timer ticks.
|
|
*
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.onUpdate_ = function() {
|
|
goog.asserts.assert(this.updateTimer_, 'Should only be called by timer');
|
|
goog.asserts.assert(this.updatePeriod_ >= 0,
|
|
'There should be an update period');
|
|
|
|
shaka.log.info('Updating manifest...');
|
|
|
|
this.updateTimer_ = null;
|
|
var startTime = Date.now();
|
|
|
|
this.requestManifest_().then(function() {
|
|
// Detect a call to stop()
|
|
if (!this.networkingEngine_)
|
|
return;
|
|
|
|
// Ensure the next update occurs within |updatePeriod_| seconds by taking
|
|
// into account the time it took to update the manifest.
|
|
var endTime = Date.now();
|
|
this.setUpdateTimer_((endTime - startTime) / 1000.0);
|
|
}.bind(this)).catch(function(error) {
|
|
goog.asserts.assert(error instanceof shaka.util.Error,
|
|
'Should only receive a Shaka error');
|
|
this.onError_(error);
|
|
|
|
// Try updating again, but ensure we haven't been destroyed.
|
|
if (this.networkingEngine_) {
|
|
this.setUpdateTimer_(0);
|
|
}
|
|
}.bind(this));
|
|
};
|
|
|
|
|
|
/**
|
|
* Sets the update timer. Does nothing if the manifest does not specify an
|
|
* update period.
|
|
*
|
|
* @param {number} offset An offset, in seconds, to apply to the manifest's
|
|
* update period.
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.setUpdateTimer_ = function(offset) {
|
|
if (this.updatePeriod_ < 0)
|
|
return;
|
|
goog.asserts.assert(this.updateTimer_ == null,
|
|
'Timer should not be already set');
|
|
|
|
var period =
|
|
Math.max(shaka.dash.DashParser.MIN_UPDATE_PERIOD_, this.updatePeriod_);
|
|
var interval = Math.max(period - offset, 0);
|
|
shaka.log.debug('updateInterval', interval);
|
|
|
|
var callback = this.onUpdate_.bind(this);
|
|
this.updateTimer_ = window.setTimeout(callback, 1000 * interval);
|
|
};
|
|
|
|
|
|
/**
|
|
* Creates a new inheritance frame for the given element.
|
|
*
|
|
* @param {!Element} elem
|
|
* @param {?shaka.dash.DashParser.InheritanceFrame} parent
|
|
* @param {Array.<string>} baseUris
|
|
* @return {shaka.dash.DashParser.InheritanceFrame}
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.createFrame_ = function(
|
|
elem, parent, baseUris) {
|
|
goog.asserts.assert(parent || baseUris,
|
|
'Must provide either parent or baseUris');
|
|
var MpdUtils = shaka.dash.MpdUtils;
|
|
var XmlUtils = shaka.util.XmlUtils;
|
|
parent = parent || /** @type {shaka.dash.DashParser.InheritanceFrame} */ ({
|
|
contentType: '',
|
|
mimeType: '',
|
|
codecs: ''
|
|
});
|
|
baseUris = baseUris || parent.baseUris;
|
|
|
|
var parseNumber = XmlUtils.parseNonNegativeInt;
|
|
var uris = XmlUtils.findChildren(elem, 'BaseURL').map(XmlUtils.getContents);
|
|
|
|
var contentType = elem.getAttribute('contentType') || parent.contentType;
|
|
var mimeType = elem.getAttribute('mimeType') || parent.mimeType;
|
|
|
|
if (!contentType) {
|
|
contentType = mimeType.split('/')[0];
|
|
}
|
|
|
|
return {
|
|
baseUris: MpdUtils.resolveUris(baseUris, uris),
|
|
segmentBase: XmlUtils.findChild(elem, 'SegmentBase') || parent.segmentBase,
|
|
segmentList: XmlUtils.findChild(elem, 'SegmentList') || parent.segmentList,
|
|
segmentTemplate:
|
|
XmlUtils.findChild(elem, 'SegmentTemplate') || parent.segmentTemplate,
|
|
width: XmlUtils.parseAttr(elem, 'width', parseNumber) || parent.width,
|
|
height: XmlUtils.parseAttr(elem, 'height', parseNumber) || parent.height,
|
|
contentType: contentType,
|
|
mimeType: mimeType,
|
|
codecs: elem.getAttribute('codecs') || parent.codecs,
|
|
id: elem.getAttribute('id')
|
|
};
|
|
};
|
|
|
|
|
|
/**
|
|
* Creates the StreamSet objects for the given AdaptationSets. This will group
|
|
* stream sets according to which streams it can switch to. If AdaptationSet
|
|
* A can switch to B, it is assumed that B can switch to A (as well as any
|
|
* stream that A can switch to).
|
|
*
|
|
* @param {!Array.<shaka.dash.DashParser.AdaptationInfo>} adaptationSets
|
|
* @return {!Array.<shakaExtern.StreamSet>}
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.createStreamSets_ = function(adaptationSets) {
|
|
var Functional = shaka.util.Functional;
|
|
/**
|
|
* A map of ID to the group it belongs to. Multiple IDs can map to the same
|
|
* group. Each entry in the group will map back to the same array.
|
|
* @type {!Object.<string, !Array.<shaka.dash.DashParser.AdaptationInfo>>}
|
|
*/
|
|
var groupMap = {};
|
|
|
|
// Create an initial map of all AS.
|
|
adaptationSets.forEach(function(set) { groupMap[set.id] = [set]; });
|
|
|
|
// Merge any AdaptationSets that can switch to each other.
|
|
adaptationSets.forEach(function(set) {
|
|
var group = groupMap[set.id];
|
|
set.switchableIds.forEach(function(id) {
|
|
var otherGroup = groupMap[id];
|
|
if (!otherGroup || otherGroup == group)
|
|
return;
|
|
|
|
// Merge the other group into the new one.
|
|
group.push.apply(group, otherGroup);
|
|
|
|
// Update each ID of the old group to map to the new group.
|
|
otherGroup.forEach(function(other) {
|
|
groupMap[other.id] = group;
|
|
});
|
|
});
|
|
});
|
|
|
|
/** @type {!Array.<shakaExtern.StreamSet>} */
|
|
var ret = [];
|
|
/** @type {!Array.<!Array.<shaka.dash.DashParser.AdaptationInfo>>} */
|
|
var seenGroups = [];
|
|
|
|
shaka.util.MapUtils.values(groupMap).forEach(function(group) {
|
|
if (seenGroups.indexOf(group) >= 0)
|
|
return;
|
|
|
|
seenGroups.push(group);
|
|
|
|
// First group AdaptationSets by type.
|
|
var setsByType = new shaka.util.MultiMap();
|
|
group.forEach(function(set) {
|
|
setsByType.push(set.contentType || '', set);
|
|
});
|
|
|
|
setsByType.keys().forEach(function(type) {
|
|
// Finally group AdaptationSets of the same type and group by language,
|
|
// then squash them into the same StreamSetInfo.
|
|
var setsByLang = new shaka.util.MultiMap();
|
|
setsByType.get(type).forEach(function(set) {
|
|
setsByLang.push(set.language, set);
|
|
});
|
|
|
|
setsByLang.keys().forEach(function(lang) {
|
|
var sets =
|
|
/** @type {!Array.<shaka.dash.DashParser.AdaptationInfo>} */ (
|
|
setsByLang.get(lang));
|
|
|
|
/** @type {shakaExtern.StreamSet} */
|
|
var streamSet = {
|
|
language: lang,
|
|
type: type,
|
|
primary: sets.some(function(s) { return s.main; }),
|
|
drmInfos:
|
|
sets.map(function(s) { return s.drmInfos; })
|
|
.reduce(Functional.collapseArrays, []),
|
|
streams:
|
|
sets.map(function(s) { return s.streams; })
|
|
.reduce(Functional.collapseArrays, [])
|
|
};
|
|
ret.push(streamSet);
|
|
}); // forEach lang
|
|
}); // forEach type
|
|
}); // map groupId
|
|
|
|
return ret;
|
|
};
|
|
|
|
|
|
/**
|
|
* Verifies that a Representation has exactly one Segment* element. Prints
|
|
* warnings if there is a problem.
|
|
*
|
|
* @param {shaka.dash.DashParser.InheritanceFrame} frame
|
|
* @return {boolean} True if the Representation is usable; otherwise return
|
|
* false.
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.verifyRepresentation_ = function(frame) {
|
|
var n = 0;
|
|
n += frame.segmentBase ? 1 : 0;
|
|
n += frame.segmentList ? 1 : 0;
|
|
n += frame.segmentTemplate ? 1 : 0;
|
|
|
|
if (n == 0) {
|
|
// TODO: extend with the list of MIME types registered to TextEngine.
|
|
if (frame.contentType == 'text' || frame.contentType == 'application') {
|
|
return true;
|
|
} else {
|
|
shaka.log.warning(
|
|
'Representation does not contain a segment information source:',
|
|
'the Representation must contain one of SegmentBase, SegmentList,',
|
|
'SegmentTemplate, or explicitly indicate that it is "text".',
|
|
frame);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (n != 1) {
|
|
shaka.log.warning(
|
|
'Representation contains multiple segment information sources:',
|
|
'the Representation should only contain one of SegmentBase,',
|
|
'SegmentList, or SegmentTemplate.',
|
|
frame);
|
|
if (frame.segmentBase) {
|
|
shaka.log.info('Using SegmentBase by default.');
|
|
frame.segmentList = null;
|
|
frame.segmentTemplate = null;
|
|
} else {
|
|
goog.asserts.assert(frame.segmentList, 'There should be a SegmentList');
|
|
shaka.log.info('Using SegmentList by default.');
|
|
frame.segmentTemplate = null;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
};
|
|
|
|
|
|
/**
|
|
* Makes a request to the given URI and calculates the clock offset.
|
|
*
|
|
* @param {!Array.<string>} baseUris
|
|
* @param {string} uri
|
|
* @param {string} method
|
|
* @return {!Promise.<number>}
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.requestForTiming_ =
|
|
function(baseUris, uri, method) {
|
|
var requestUris = shaka.dash.MpdUtils.resolveUris(baseUris, [uri]);
|
|
var request = shaka.net.NetworkingEngine.makeRequest(
|
|
requestUris, this.config_.retryParameters);
|
|
request.method = method;
|
|
var type = shaka.net.NetworkingEngine.RequestType.MANIFEST;
|
|
return this.networkingEngine_.request(type, request).then(function(response) {
|
|
var text;
|
|
if (method == 'HEAD') {
|
|
if (!response.headers || !response.headers['date'])
|
|
return 0;
|
|
|
|
text = response.headers['date'];
|
|
} else {
|
|
text = shaka.util.StringUtils.fromUTF8(response.data);
|
|
}
|
|
|
|
var date = Date.parse(text);
|
|
return isNaN(date) ? 0 : (date - Date.now());
|
|
});
|
|
};
|
|
|
|
|
|
/**
|
|
* Parses an array of UTCTiming elements.
|
|
*
|
|
* @param {!Array.<string>} baseUris
|
|
* @param {!Array.<!Element>} elems
|
|
* @param {boolean} isLive
|
|
* @return {!Promise.<number>}
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.parseUtcTiming_ =
|
|
function(baseUris, elems, isLive) {
|
|
var schemesAndValues = elems.map(function(elem) {
|
|
return {
|
|
scheme: elem.getAttribute('schemeIdUri'),
|
|
value: elem.getAttribute('value')
|
|
};
|
|
});
|
|
|
|
// If there's nothing specified in the manifest, but we have a default from
|
|
// the config, use that.
|
|
var clockSyncUri = this.config_.dash.clockSyncUri;
|
|
if (isLive && !schemesAndValues.length && clockSyncUri) {
|
|
schemesAndValues.push({
|
|
scheme: 'urn:mpeg:dash:utc:http-head:2014',
|
|
value: clockSyncUri
|
|
});
|
|
}
|
|
|
|
var Functional = shaka.util.Functional;
|
|
return Functional.createFallbackPromiseChain(schemesAndValues, function(sv) {
|
|
var scheme = sv.scheme;
|
|
var value = sv.value;
|
|
switch (scheme) {
|
|
// See DASH IOP Guidelines Section 4.7
|
|
// http://goo.gl/CQFNJT
|
|
case 'urn:mpeg:dash:utc:http-head:2014':
|
|
// Some old ISO23009-1 drafts used 2012.
|
|
case 'urn:mpeg:dash:utc:http-head:2012':
|
|
return this.requestForTiming_(baseUris, value, 'HEAD');
|
|
case 'urn:mpeg:dash:utc:http-xsdate:2014':
|
|
case 'urn:mpeg:dash:utc:http-iso:2014':
|
|
case 'urn:mpeg:dash:utc:http-xsdate:2012':
|
|
case 'urn:mpeg:dash:utc:http-iso:2012':
|
|
return this.requestForTiming_(baseUris, value, 'GET');
|
|
case 'urn:mpeg:dash:utc:direct:2014':
|
|
case 'urn:mpeg:dash:utc:direct:2012':
|
|
var date = Date.parse(value);
|
|
return isNaN(date) ? 0 : (date - Date.now());
|
|
|
|
case 'urn:mpeg:dash:utc:http-ntp:2014':
|
|
case 'urn:mpeg:dash:utc:ntp:2014':
|
|
case 'urn:mpeg:dash:utc:sntp:2014':
|
|
shaka.log.warning('NTP UTCTiming scheme is not supported');
|
|
return Promise.reject();
|
|
default:
|
|
shaka.log.warning(
|
|
'Unrecognized scheme in UTCTiming element', scheme);
|
|
return Promise.reject();
|
|
}
|
|
}.bind(this)).catch(function() {
|
|
if (isLive) {
|
|
shaka.log.warning(
|
|
'A UTCTiming element should always be given in live manifests! ' +
|
|
'This content may not play on clients with bad clocks!');
|
|
}
|
|
return 0;
|
|
});
|
|
};
|
|
|
|
|
|
/**
|
|
* Makes a network request on behalf of SegmentBase.createStream.
|
|
*
|
|
* @param {!Array.<string>} uris
|
|
* @param {?number} startByte
|
|
* @param {?number} endByte
|
|
* @return {!Promise.<!ArrayBuffer>}
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.requestInitSegment_ = function(
|
|
uris, startByte, endByte) {
|
|
var requestType = shaka.net.NetworkingEngine.RequestType.SEGMENT;
|
|
var request = shaka.net.NetworkingEngine.makeRequest(
|
|
uris, this.config_.retryParameters);
|
|
if (startByte != null) {
|
|
var end = (endByte != null ? endByte : '');
|
|
request.headers['Range'] = 'bytes=' + startByte + '-' + end;
|
|
}
|
|
|
|
return this.networkingEngine_.request(requestType, request)
|
|
.then(function(response) { return response.data; });
|
|
};
|
|
|
|
|
|
/**
|
|
* Response filter that looks for presence of EMSG
|
|
* boxes in segments. If a box is found, depending on the content it
|
|
* either triggers the manifest update or dispatches an event with the
|
|
* box content to the application.
|
|
*
|
|
* @param {shaka.net.NetworkingEngine.RequestType} type
|
|
* @param {!shakaExtern.Response} response
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.emsgResponseFilter_ = function(type, response) {
|
|
// Only look for segment responses:
|
|
if (type == shaka.net.NetworkingEngine.RequestType.SEGMENT) {
|
|
var reader = new shaka.util.DataViewReader(new DataView(response.data),
|
|
shaka.util.DataViewReader.Endianness.BIG_ENDIAN);
|
|
var boxSize = shaka.util.Mp4Parser.findBox(
|
|
shaka.dash.DashParser.BOX_TYPE_EMSG, reader);
|
|
if (boxSize != shaka.util.Mp4Parser.BOX_NOT_FOUND) {
|
|
var start = reader.getPosition() - 8;
|
|
var end = start + boxSize;
|
|
// skip version and flags
|
|
reader.skip(4);
|
|
var scheme_id = reader.readTerminatedString();
|
|
// scheme_id of "urn:mpeg:dash:event:2012" means it's
|
|
// time to update the manifest
|
|
if (scheme_id == shaka.dash.DashParser.DASH_EMSG_SCHEME_ID_URI) {
|
|
// trigger manifest update
|
|
this.requestManifest_();
|
|
} else {
|
|
// read rest of the data and dispatch event to the application
|
|
var value = reader.readTerminatedString();
|
|
var timescale = reader.readUint32();
|
|
var presentationTimeDelta = reader.readUint32();
|
|
var eventDuration = reader.readUint32();
|
|
var id = reader.readUint32();
|
|
var messageData = reader.readBytes(end - reader.getPosition());
|
|
|
|
/** @type {shaka.dash.DashParser.EmsgInfo} */
|
|
var emsg = {
|
|
schemeIdUri: scheme_id,
|
|
value: value,
|
|
timescale: timescale,
|
|
presentationTimeDelta: presentationTimeDelta,
|
|
eventDuration: eventDuration,
|
|
id: id,
|
|
messageData: messageData
|
|
};
|
|
|
|
var event = new shaka.util.FakeEvent(
|
|
'emsg', { 'detail': emsg });
|
|
this.onEvent_(event);
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
/** @const {number} */
|
|
shaka.dash.DashParser.BOX_TYPE_EMSG = 0x656D7367;
|
|
|
|
|
|
/** @const {string} */
|
|
shaka.dash.DashParser.DASH_EMSG_SCHEME_ID_URI = 'urn:mpeg:dash:event:2012';
|
|
|
|
|
|
shaka.media.ManifestParser.registerParserByExtension(
|
|
'mpd', shaka.dash.DashParser);
|
|
shaka.media.ManifestParser.registerParserByMime(
|
|
'application/dash+xml', shaka.dash.DashParser);
|
|
|