mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-24 17:35:10 +03:00
Jacob Trimble
68e870dc9a
This also makes the Playhead ignore duplicate regions. This simplifies manifest updates in DashParser by having it add every Event tag it sees. The DASH spec doesn't specify how we should detect duplicate entries or how events are fired. So to avoid firing all the same 'timelineregionadded' events on every manifest update and getting multiple enter/exit events, we will simply remove duplicates. Closes #462 Change-Id: If5d2c42bd6958567b2ec05ba1e9af252c95cf354
1481 lines
48 KiB
JavaScript
1481 lines
48 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.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.DrmEngine');
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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.ManifestParserUtils');
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goog.require('shaka.util.Mp4Parser');
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goog.require('shaka.util.StreamUtils');
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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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* @export
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*/
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shaka.dash.DashParser = function() {
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/** @private {?shakaExtern.ManifestConfiguration} */
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this.config_ = null;
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/** @private {?shakaExtern.ManifestParser.PlayerInterface} */
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this.playerInterface_ = 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 {!shakaExtern.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_ = 10;
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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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* frameRate: (number|undefined),
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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 {(number|undefined)} frameRate
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* The inherited framerate 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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* dynamic: boolean,
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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 {boolean} dynamic
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* True if the MPD is dynamic (not all segments available at once)
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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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* containsInband: boolean,
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* trickModeFor: ?string
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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 {boolean} containsInband
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* Signals whether AdaptationSet has inband content indicator on it.
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* @property {?string} trickModeFor
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* If non-null, this AdaptationInfo represents trick mode tracks. This
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* property is the ID of the normal AdaptationSet these tracks should be
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* associated with.
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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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/** @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 = function(uri, playerInterface) {
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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.playerInterface_ = playerInterface;
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return this.requestManifest_().then(function() {
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if (this.playerInterface_)
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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.playerInterface_) {
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this.playerInterface_.networkingEngine.unregisterResponseFilter(
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this.emsgResponseFilter_);
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}
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this.playerInterface_ = 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.playerInterface_.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.playerInterface_)
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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 ManifestParserUtils = shaka.util.ManifestParserUtils;
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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 = ManifestParserUtils.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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// DASH IOP v3.0 suggests using a default delay between minBufferTime and
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// timeShiftBufferDepth. This is literally the range of all feasible
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// choices for the value. Nothing older than timeShiftBufferDepth is still
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// available, and anything less than minBufferTime will cause buffering
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// issues.
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//
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// We have decided that our default will be 1.5 * minBufferTime, or 10s,
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// whichever is larger. This is fairly conservative. Content providers
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// should provide a suggestedPresentationDelay whenever possible to optimize
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// the live streaming experience.
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var defaultPresentationDelay = Math.max(
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shaka.dash.DashParser.DEFAULT_SUGGESTED_PRESENTATION_DELAY_,
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minBufferTime * 1.5);
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var presentationDelay = suggestedPresentationDelay != null ?
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suggestedPresentationDelay : defaultPresentationDelay;
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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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dynamic: mpdType != 'static',
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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 || Infinity);
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presentationTimeline.setSegmentAvailabilityDuration(
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segmentAvailabilityDuration != null ?
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segmentAvailabilityDuration :
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Infinity);
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// Use @maxSegmentDuration to override smaller, derived values.
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presentationTimeline.notifyMaxSegmentDuration(maxSegmentDuration || 1);
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if (!COMPILED) presentationTimeline.assertIsValid();
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if (this.manifest_) {
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// This is a manifest update, so we're done.
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return Promise.resolve();
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}
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// This is the first manifest parse, so we cannot return until we calculate
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// the clock offset.
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var timingElements = XmlUtils.findChildren(mpd, 'UTCTiming');
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var isLive = presentationTimeline.isLive();
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// if any of the periods had an emsg box indicator,
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// register a response filter to look for an EMSG box in segments
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if (periodsAndDuration.containsInband) {
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this.playerInterface_.networkingEngine.registerResponseFilter(
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this.emsgResponseFilter_);
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}
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return this.parseUtcTiming_(
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baseUris, timingElements, isLive).then(function(offset) {
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// Detect calls to stop().
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if (!this.playerInterface_)
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return;
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|
|
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 containsInband = false;
|
|
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);
|
|
// parsePeriod_ has now calculated info.containsInband.
|
|
containsInband = containsInband || info.containsInband;
|
|
|
|
// 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.playerInterface_.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: containsInband
|
|
};
|
|
} else {
|
|
return {
|
|
periods: periods,
|
|
duration: prevEnd,
|
|
containsInband: 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 eventStreamNodes = XmlUtils.findChildren(periodInfo.node, 'EventStream');
|
|
eventStreamNodes.forEach(
|
|
this.parseEventStream_.bind(this, periodInfo.start, periodInfo.duration));
|
|
|
|
var adaptationSetNodes =
|
|
XmlUtils.findChildren(periodInfo.node, 'AdaptationSet');
|
|
var adaptationSets = adaptationSetNodes
|
|
.map(this.parseAdaptationSet_.bind(this, context))
|
|
.filter(shaka.util.Functional.isNotNull);
|
|
|
|
var normalAdaptationSets = adaptationSets
|
|
.filter(function(as) { return !as.trickModeFor; });
|
|
|
|
var trickModeAdaptationSets = adaptationSets
|
|
.filter(function(as) { return as.trickModeFor; });
|
|
|
|
// Attach trick mode tracks to normal tracks.
|
|
trickModeAdaptationSets.forEach(function(trickModeSet) {
|
|
// There may be multiple trick mode streams, but we do not currently
|
|
// support that. Just choose one.
|
|
var trickModeVideo = trickModeSet.streams[0];
|
|
var targetId = trickModeSet.trickModeFor;
|
|
normalAdaptationSets.forEach(function(normalSet) {
|
|
if (normalSet.id == targetId) {
|
|
normalSet.streams.forEach(function(stream) {
|
|
stream.trickModeVideo = trickModeVideo;
|
|
});
|
|
}
|
|
});
|
|
});
|
|
|
|
// 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 < normalAdaptationSets.length; i++) {
|
|
if (normalAdaptationSets[i].containsInband) {
|
|
periodInfo.containsInband = true;
|
|
}
|
|
}
|
|
|
|
var videoSets = this.getSetsOfType_(normalAdaptationSets, 'video');
|
|
var audioSets = this.getSetsOfType_(normalAdaptationSets, 'audio');
|
|
|
|
if (!videoSets.length && !audioSets.length) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.DASH_EMPTY_PERIOD);
|
|
}
|
|
|
|
// In case of audio-only or video-only content, we create an array of one item
|
|
// containing a null. This way, the double-loop works for all kinds of
|
|
// content.
|
|
if (!audioSets.length) {
|
|
audioSets = [null];
|
|
}
|
|
if (!videoSets.length) {
|
|
videoSets = [null];
|
|
}
|
|
|
|
// TODO: Limit number of combinations. Come up with a heuristic
|
|
// to decide which audio tracks to combine with which video tracks.
|
|
var variants = [];
|
|
for (var i = 0; i < audioSets.length; i++) {
|
|
for (var j = 0; j < videoSets.length; j++) {
|
|
var audioSet = audioSets[i];
|
|
var videoSet = videoSets[j];
|
|
this.createVariants_(audioSet, videoSet, variants);
|
|
}
|
|
}
|
|
|
|
var textSets = this.getSetsOfType_(normalAdaptationSets, 'text');
|
|
var textStreams = [];
|
|
for (var i = 0; i < textSets.length; i++) {
|
|
textStreams.push.apply(textStreams, textSets[i].streams);
|
|
}
|
|
|
|
return {
|
|
startTime: periodInfo.start,
|
|
textStreams: textStreams,
|
|
variants: variants
|
|
};
|
|
};
|
|
|
|
|
|
/**
|
|
* @param {!Array.<!shaka.dash.DashParser.AdaptationInfo>} adaptationSets
|
|
* @param {string} type
|
|
* @return {!Array.<!shaka.dash.DashParser.AdaptationInfo>}
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.getSetsOfType_ = function(
|
|
adaptationSets, type) {
|
|
return adaptationSets.filter(function(as) {
|
|
return as.contentType == type;
|
|
});
|
|
};
|
|
|
|
|
|
/**
|
|
* Combines Streams into Variants
|
|
*
|
|
* @param {?shaka.dash.DashParser.AdaptationInfo} audio
|
|
* @param {?shaka.dash.DashParser.AdaptationInfo} video
|
|
* @param {!Array.<shakaExtern.Variant>} variants New variants are pushed onto
|
|
* this array.
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.createVariants_ =
|
|
function(audio, video, variants) {
|
|
// Since both audio and video are of the same type, this assertion will catch
|
|
// certain mistakes at runtime that the compiler would miss.
|
|
goog.asserts.assert(!audio || audio.contentType == 'audio',
|
|
'Audio parameter mistmatch!');
|
|
goog.asserts.assert(!video || video.contentType == 'video',
|
|
'Video parameter mistmatch!');
|
|
|
|
/** @type {number} */
|
|
var bandwidth;
|
|
/** @type {shakaExtern.Variant} */
|
|
var variant;
|
|
|
|
if (!audio && !video) {
|
|
return;
|
|
} else if (audio && video) {
|
|
// Audio+video variants
|
|
var DrmEngine = shaka.media.DrmEngine;
|
|
if (DrmEngine.areDrmCompatible(audio.drmInfos, video.drmInfos)) {
|
|
var drmInfos = DrmEngine.getCommonDrmInfos(audio.drmInfos,
|
|
video.drmInfos);
|
|
|
|
for (var i = 0; i < audio.streams.length; i++) {
|
|
for (var j = 0; j < video.streams.length; j++) {
|
|
// Explicit cast, followed by assertion. These should both be defined
|
|
// in the case of DASH, but the type of Stream.bandwidth allows for
|
|
// undefined in order to support HLS.
|
|
bandwidth = /** @type {number} */(
|
|
video.streams[j].bandwidth +
|
|
audio.streams[i].bandwidth);
|
|
goog.asserts.assert(bandwidth,
|
|
'Bandwidth must be defined and non-zero!');
|
|
variant = {
|
|
id: this.globalId_++,
|
|
language: audio.language,
|
|
primary: audio.main || video.main,
|
|
audio: audio.streams[i],
|
|
video: video.streams[j],
|
|
bandwidth: bandwidth,
|
|
drmInfos: drmInfos,
|
|
allowedByApplication: true,
|
|
allowedByKeySystem: true
|
|
};
|
|
|
|
variants.push(variant);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
// Audio or video only variants
|
|
var set = audio || video;
|
|
for (var i = 0; i < set.streams.length; i++) {
|
|
// Explicit cast, followed by assertion. These should both be defined
|
|
// in the case of DASH, but the type allows for undefined in order to
|
|
// support HLS.
|
|
bandwidth = /** @type {number} */(set.streams[i].bandwidth);
|
|
goog.asserts.assert(bandwidth,
|
|
'Bandwidth must be defined and non-zero!');
|
|
variant = {
|
|
id: this.globalId_++,
|
|
language: set.language || '',
|
|
primary: set.main,
|
|
audio: audio ? set.streams[i] : null,
|
|
video: video ? set.streams[i] : null,
|
|
bandwidth: bandwidth,
|
|
drmInfos: set.drmInfos,
|
|
allowedByApplication: true,
|
|
allowedByKeySystem: true
|
|
};
|
|
|
|
variants.push(variant);
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* 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 roles = XmlUtils.findChildren(elem, 'Role');
|
|
|
|
// Default kind for text streams is 'subtitle' if unspecified in the manifest.
|
|
var kind = undefined;
|
|
if (context.adaptationSet.contentType == 'text') kind = 'subtitle';
|
|
|
|
for (var i = 0; i < roles.length; i++) {
|
|
var scheme = roles[i].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 = roles[i].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 essentialProperties = XmlUtils.findChildren(elem, 'EssentialProperty');
|
|
// ID of real AdaptationSet if this is a trick mode set:
|
|
var trickModeFor = null;
|
|
var unrecognizedEssentialProperty = false;
|
|
essentialProperties.forEach(function(prop) {
|
|
var schemeId = prop.getAttribute('schemeIdUri');
|
|
if (schemeId == 'http://dashif.org/guidelines/trickmode') {
|
|
trickModeFor = prop.getAttribute('value');
|
|
} else {
|
|
unrecognizedEssentialProperty = true;
|
|
}
|
|
});
|
|
|
|
// According to DASH spec (2014) section 5.8.4.8, "the successful processing
|
|
// of the descriptor is essential to properly use the information in the
|
|
// parent element". According to DASH IOP v3.3, section 3.3.4, "if the scheme
|
|
// or the value" for EssentialProperty is not recognized, "the DASH client
|
|
// shall ignore the parent element."
|
|
if (unrecognizedEssentialProperty) {
|
|
// Stop parsing this AdaptationSet and let the caller filter out the nulls.
|
|
return null;
|
|
}
|
|
|
|
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, main))
|
|
.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;
|
|
context.adaptationSet.contentType =
|
|
shaka.dash.DashParser.guessContentType_(mimeType, codecs);
|
|
|
|
streams.forEach(function(stream) {
|
|
stream.type = context.adaptationSet.contentType;
|
|
});
|
|
}
|
|
|
|
return {
|
|
id: context.adaptationSet.id || ('__fake__' + this.globalId_++),
|
|
contentType: context.adaptationSet.contentType,
|
|
language: language,
|
|
main: main,
|
|
streams: streams,
|
|
drmInfos: contentProtection.drmInfos,
|
|
containsInband: containsInband,
|
|
trickModeFor: trickModeFor
|
|
};
|
|
};
|
|
|
|
|
|
/**
|
|
* 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 {boolean} isPrimary
|
|
* @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, isPrimary, 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,
|
|
frameRate: context.representation.frameRate,
|
|
bandwidth: context.bandwidth,
|
|
width: context.representation.width,
|
|
height: context.representation.height,
|
|
kind: kind,
|
|
encrypted: contentProtection.drmInfos.length > 0,
|
|
keyId: keyId,
|
|
language: language,
|
|
type: context.adaptationSet.contentType,
|
|
primary: isPrimary,
|
|
trickModeVideo: null
|
|
};
|
|
};
|
|
|
|
|
|
/**
|
|
* 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.playerInterface_)
|
|
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.playerInterface_.onError(error);
|
|
|
|
// Try updating again, but ensure we haven't been destroyed.
|
|
if (this.playerInterface_) {
|
|
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 ManifestParserUtils = shaka.util.ManifestParserUtils;
|
|
var XmlUtils = shaka.util.XmlUtils;
|
|
parent = parent || /** @type {shaka.dash.DashParser.InheritanceFrame} */ ({
|
|
contentType: '',
|
|
mimeType: '',
|
|
codecs: '',
|
|
frameRate: undefined
|
|
});
|
|
baseUris = baseUris || parent.baseUris;
|
|
|
|
var parseNumber = XmlUtils.parseNonNegativeInt;
|
|
var evalDivision = XmlUtils.evalDivision;
|
|
var uris = XmlUtils.findChildren(elem, 'BaseURL').map(XmlUtils.getContents);
|
|
|
|
var contentType = elem.getAttribute('contentType') || parent.contentType;
|
|
var mimeType = elem.getAttribute('mimeType') || parent.mimeType;
|
|
var codecs = elem.getAttribute('codecs') || parent.codecs;
|
|
var frameRate = XmlUtils.parseAttr(elem, 'frameRate',
|
|
evalDivision) || parent.frameRate;
|
|
|
|
if (!contentType) {
|
|
contentType = shaka.dash.DashParser.guessContentType_(mimeType, codecs);
|
|
}
|
|
|
|
return {
|
|
baseUris: ManifestParserUtils.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: codecs,
|
|
frameRate: frameRate,
|
|
id: elem.getAttribute('id')
|
|
};
|
|
};
|
|
|
|
|
|
/**
|
|
* 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.util.ManifestParserUtils.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.playerInterface_.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;
|
|
});
|
|
};
|
|
|
|
|
|
/**
|
|
* Parses an EventStream element.
|
|
*
|
|
* @param {number} periodStart
|
|
* @param {?number} periodDuration
|
|
* @param {!Element} elem
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.parseEventStream_ = function(
|
|
periodStart, periodDuration, elem) {
|
|
var XmlUtils = shaka.util.XmlUtils;
|
|
var parseNumber = XmlUtils.parseNonNegativeInt;
|
|
|
|
var schemeIdUri = elem.getAttribute('schemeIdUri') || '';
|
|
var value = elem.getAttribute('value') || '';
|
|
var timescale = XmlUtils.parseAttr(elem, 'timescale', parseNumber) || 1;
|
|
|
|
XmlUtils.findChildren(elem, 'Event').forEach(function(eventNode) {
|
|
var presentationTime =
|
|
XmlUtils.parseAttr(eventNode, 'presentationTime', parseNumber) || 0;
|
|
var duration = XmlUtils.parseAttr(eventNode, 'duration', parseNumber) || 0;
|
|
|
|
var startTime = presentationTime / timescale + periodStart;
|
|
var endTime = startTime + (duration / timescale);
|
|
if (periodDuration != null) {
|
|
// An event should not go past the Period, even if the manifest says so.
|
|
// See: Dash sec. 5.10.2.1
|
|
startTime = Math.min(startTime, periodStart + periodDuration);
|
|
endTime = Math.min(endTime, periodStart + periodDuration);
|
|
}
|
|
|
|
/** @type {shakaExtern.TimelineRegionInfo} */
|
|
var region = {
|
|
schemeIdUri: schemeIdUri,
|
|
value: value,
|
|
startTime: startTime,
|
|
endTime: endTime,
|
|
id: eventNode.getAttribute('id') || '',
|
|
eventElement: eventNode
|
|
};
|
|
|
|
this.playerInterface_.onTimelineRegionAdded(region);
|
|
}.bind(this));
|
|
};
|
|
|
|
|
|
/**
|
|
* 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.playerInterface_.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
|
|
* @return {(Promise|undefined)}
|
|
* @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 {shakaExtern.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.playerInterface_.onEvent(event);
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Guess the content type based on MIME type and codecs.
|
|
*
|
|
* @param {string} mimeType
|
|
* @param {string} codecs
|
|
* @return {string}
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.guessContentType_ = function(mimeType, codecs) {
|
|
var fullMimeType = shaka.util.StreamUtils.getFullMimeType(mimeType, 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.
|
|
return 'text';
|
|
}
|
|
|
|
// Otherwise, just split the MIME type. This handles video and audio
|
|
// types well.
|
|
return mimeType.split('/')[0];
|
|
};
|
|
|
|
|
|
/** @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);
|
|
|