mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-16 16:16:40 +03:00
Jacob Trimble
f0c85093b4
We shouldn't use the sum of Period durations to detect the duration of live streams. It is possible for Periods to be added or the duration to change, so the sum of Period durations is only valid for VOD. Closes #1148 Change-Id: I53846807d18b97b0127eb75bb83be526eb7095ee
1605 lines
52 KiB
JavaScript
1605 lines
52 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.net.NetworkingEngine');
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goog.require('shaka.text.TextEngine');
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goog.require('shaka.util.Error');
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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.MimeUtils');
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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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};
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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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* containsEmsgBoxes: boolean,
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* id: string,
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* numChannels: ?number
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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 {boolean} containsEmsgBoxes
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* Whether there are 'emsg' boxes.
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* @property {string} id
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* The ID of the element.
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* @property {?number} numChannels
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* The number of audio channels, or null if unknown.
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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,
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* indexRangeWarningGiven: boolean
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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} bandwidth
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* The bandwidth of the Representation, or zero if missing.
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* @property {boolean} indexRangeWarningGiven
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* True if the warning about SegmentURL@indexRange has been printed.
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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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* isLastPeriod: 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} isLastPeriod
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* Whether this Period is the last one in the manifest.
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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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* trickModeFor: ?string,
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* representationIds: !Array.<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 {?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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* @property {!Array.<string>} representationIds
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* An array of the IDs of the Representations this AdaptationSet contains.
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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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* scaledPresentationTimeOffset: number
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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} scaledPresentationTimeOffset
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* The presentation time offset for the stream, in seconds.
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*/
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shaka.dash.DashParser.StreamInfo;
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/**
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* @override
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* @exportInterface
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*/
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shaka.dash.DashParser.prototype.configure = function(config) {
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goog.asserts.assert(config.dash != null,
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'DashManifestConfiguration should not be null!');
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this.config_ = config;
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};
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/**
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* @override
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* @exportInterface
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*/
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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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/**
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* @override
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* @exportInterface
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*/
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shaka.dash.DashParser.prototype.stop = function() {
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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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* @override
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* @exportInterface
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*/
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shaka.dash.DashParser.prototype.update = function() {
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this.requestManifest_().catch(function(error) {
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if (!this.playerInterface_) return;
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this.playerInterface_.onError(error);
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}.bind(this));
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};
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/**
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* @override
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* @exportInterface
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*/
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shaka.dash.DashParser.prototype.onExpirationUpdated = function(
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sessionId, expiration) {
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// No-op
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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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var networkingEngine = this.playerInterface_.networkingEngine;
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var isCanceled = (function() {
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return !this.playerInterface_;
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}).bind(this);
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return networkingEngine.request(requestType, request, isCanceled)
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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 MpdUtils = shaka.dash.MpdUtils;
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var mpd = MpdUtils.parseXml(data, 'MPD');
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if (!mpd) {
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throw new Error(
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Error.Severity.CRITICAL, Error.Category.MANIFEST,
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Error.Code.DASH_INVALID_XML, finalManifestUri);
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}
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// Process the mpd to account for xlink connections.
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var failGracefully = this.config_.dash.xlinkFailGracefully;
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var xlinkPromise = MpdUtils.processXlinks(
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mpd, this.config_.retryParameters, failGracefully, finalManifestUri,
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this.playerInterface_.networkingEngine);
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return xlinkPromise.then(function(finalMpd) {
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return this.processManifest_(finalMpd, finalManifestUri);
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}.bind(this));
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};
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/**
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* Taked a formatted MPD and converts it into a manifest.
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*
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* @param {!Element} mpd
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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.processManifest_ =
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function(mpd, finalManifestUri) {
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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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// 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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/** @type {!shaka.media.PresentationTimeline} */
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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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// Don't base on updatePeriod_ since emsg boxes can cause manifest updates.
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dynamic: mpdType != 'static',
|
|
presentationTimeline: presentationTimeline,
|
|
period: null,
|
|
periodInfo: null,
|
|
adaptationSet: null,
|
|
representation: null,
|
|
bandwidth: 0,
|
|
indexRangeWarningGiven: false
|
|
};
|
|
|
|
var periodsAndDuration = this.parsePeriods_(context, baseUris, mpd);
|
|
var duration = periodsAndDuration.duration;
|
|
var periods = periodsAndDuration.periods;
|
|
|
|
presentationTimeline.setStatic(mpdType == 'static');
|
|
if (mpdType == 'static' || !periodsAndDuration.durationDerivedFromPeriods) {
|
|
// Ignore duration calculated from Period lengths if this is dynamic.
|
|
presentationTimeline.setDuration(duration || Infinity);
|
|
}
|
|
presentationTimeline.setSegmentAvailabilityDuration(
|
|
segmentAvailabilityDuration != null ?
|
|
segmentAvailabilityDuration :
|
|
Infinity);
|
|
// Use @maxSegmentDuration to override smaller, derived values.
|
|
presentationTimeline.notifyMaxSegmentDuration(maxSegmentDuration || 1);
|
|
if (goog.DEBUG) 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();
|
|
|
|
return this.parseUtcTiming_(
|
|
baseUris, timingElements, isLive).then(function(offset) {
|
|
// Detect calls to stop().
|
|
if (!this.playerInterface_)
|
|
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,
|
|
* durationDerivedFromPeriods: boolean
|
|
* }}
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.parsePeriods_ = function(
|
|
context, baseUris, mpd) {
|
|
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 givenDuration =
|
|
XmlUtils.parseAttr(elem, 'duration', XmlUtils.parseDuration);
|
|
|
|
var periodDuration = null;
|
|
if (i != periodNodes.length - 1) {
|
|
// "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;
|
|
}
|
|
|
|
var threshold =
|
|
shaka.util.ManifestParserUtils.GAP_OVERLAP_TOLERANCE_SECONDS;
|
|
if (periodDuration && givenDuration &&
|
|
Math.abs(periodDuration - givenDuration) > threshold) {
|
|
shaka.log.warning('There is a gap/overlap between Periods', elem);
|
|
}
|
|
// Only use the @duration in the MPD if we can't calculate it. We should
|
|
// favor the @start of the following Period. This ensures that there aren't
|
|
// gaps between Periods.
|
|
if (periodDuration == null)
|
|
periodDuration = givenDuration;
|
|
|
|
|
|
// Parse child nodes.
|
|
var info = {
|
|
start: start,
|
|
duration: periodDuration,
|
|
node: elem,
|
|
isLastPeriod: periodDuration == null || i == periodNodes.length - 1
|
|
};
|
|
var period = this.parsePeriod_(context, baseUris, info);
|
|
periods.push(period);
|
|
|
|
// If the period ID is new, add it to the list. This must be done for both
|
|
// the initial manifest parse and for updates.
|
|
// See https://github.com/google/shaka-player/issues/963
|
|
var periodId = context.period.id;
|
|
if (this.periodIds_.indexOf(periodId) == -1) {
|
|
this.periodIds_.push(periodId);
|
|
|
|
// If this is an update, call filterNewPeriod and add it to the manifest.
|
|
// If this is the first parse of the manifest (this.manifest_ == null),
|
|
// filterAllPeriods will be called later.
|
|
if (this.manifest_) {
|
|
this.playerInterface_.filterNewPeriod(period);
|
|
this.manifest_.periods.push(period);
|
|
}
|
|
}
|
|
|
|
if (periodDuration == null) {
|
|
if (i != periodNodes.length - 1) {
|
|
// 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;
|
|
} // end of period parsing loop
|
|
|
|
// Call filterAllPeriods if this is the initial parse.
|
|
if (this.manifest_ == null) {
|
|
this.playerInterface_.filterAllPeriods(periods);
|
|
}
|
|
|
|
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,
|
|
durationDerivedFromPeriods: false
|
|
};
|
|
} else {
|
|
return {
|
|
periods: periods,
|
|
duration: prevEnd,
|
|
durationDerivedFromPeriods: true
|
|
};
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* 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 Functional = shaka.util.Functional;
|
|
var XmlUtils = shaka.util.XmlUtils;
|
|
var ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
|
|
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(Functional.isNotNull);
|
|
|
|
var representationIds = adaptationSets
|
|
.map(function(as) { return as.representationIds; })
|
|
.reduce(Functional.collapseArrays, []);
|
|
var uniqueRepIds = representationIds.filter(Functional.isNotDuplicate);
|
|
if (context.dynamic && representationIds.length != uniqueRepIds.length) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.DASH_DUPLICATE_REPRESENTATION_ID);
|
|
}
|
|
|
|
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;
|
|
});
|
|
}
|
|
});
|
|
});
|
|
|
|
var videoSets = this.getSetsOfType_(normalAdaptationSets, ContentType.VIDEO);
|
|
var audioSets = this.getSetsOfType_(normalAdaptationSets, ContentType.AUDIO);
|
|
|
|
if (!videoSets.length && !audioSets.length) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
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, ContentType.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) {
|
|
var ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
|
|
// 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 == ContentType.AUDIO,
|
|
'Audio parameter mismatch!');
|
|
goog.asserts.assert(!video || video.contentType == ContentType.VIDEO,
|
|
'Video parameter mismatch!');
|
|
|
|
/** @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++) {
|
|
bandwidth =
|
|
(video.streams[j].bandwidth || 0) +
|
|
(audio.streams[i].bandwidth || 0);
|
|
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++) {
|
|
bandwidth = set.streams[i].bandwidth || 0;
|
|
variant = {
|
|
id: this.globalId_++,
|
|
language: set.language || 'und',
|
|
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;
|
|
var Functional = shaka.util.Functional;
|
|
var ManifestParserUtils = shaka.util.ManifestParserUtils;
|
|
var ContentType = ManifestParserUtils.ContentType;
|
|
|
|
context.adaptationSet = this.createFrame_(elem, context.period, null);
|
|
|
|
var main = false;
|
|
var roleElements = XmlUtils.findChildren(elem, 'Role');
|
|
var roleValues = roleElements.map(function(role) {
|
|
return role.getAttribute('value');
|
|
}).filter(Functional.isNotNull);
|
|
|
|
// Default kind for text streams is 'subtitle' if unspecified in the manifest.
|
|
var kind = undefined;
|
|
if (context.adaptationSet.contentType == ManifestParserUtils.ContentType.TEXT)
|
|
kind = ManifestParserUtils.TextStreamKind.SUBTITLE;
|
|
|
|
for (var i = 0; i < roleElements.length; i++) {
|
|
var scheme = roleElements[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 = roleElements[i].getAttribute('value');
|
|
switch (value) {
|
|
case 'main':
|
|
main = true;
|
|
break;
|
|
case 'caption':
|
|
case 'subtitle':
|
|
kind = value;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
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,
|
|
this.config_.dash.ignoreDrmInfo);
|
|
|
|
var language =
|
|
shaka.util.LanguageUtils.normalize(elem.getAttribute('lang') || 'und');
|
|
|
|
// non-standard attribute(yet) supported by Kaltura
|
|
var label = elem.getAttribute('label');
|
|
|
|
// Parse Representations into Streams.
|
|
var representations = XmlUtils.findChildren(elem, 'Representation');
|
|
var streams = representations
|
|
.map(this.parseRepresentation_.bind(this, context, contentProtection,
|
|
kind, language, label, main, roleValues))
|
|
.filter(function(s) { return !!s; });
|
|
|
|
if (streams.length == 0) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.DASH_EMPTY_ADAPTATION_SET);
|
|
}
|
|
|
|
// If AdaptationSet's type is unknown or is ambiguously "application",
|
|
// guess based on the information in the first stream. If the attributes
|
|
// mimeType and codecs are split across levels, they will both be inherited
|
|
// down to the stream level by this point, so the stream will have all the
|
|
// necessary information.
|
|
if (!context.adaptationSet.contentType ||
|
|
context.adaptationSet.contentType == ContentType.APPLICATION) {
|
|
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;
|
|
});
|
|
}
|
|
|
|
streams.forEach(function(stream) {
|
|
// Some DRM license providers require that we have a default
|
|
// key ID from the manifest in the wrapped license request.
|
|
// Thus, it should be put in drmInfo to be accessible to request filters.
|
|
contentProtection.drmInfos.forEach(function(drmInfo) {
|
|
if (stream.keyId) {
|
|
drmInfo.keyIds.push(stream.keyId);
|
|
}
|
|
});
|
|
});
|
|
|
|
var repIds = representations
|
|
.map(function(node) { return node.getAttribute('id'); })
|
|
.filter(shaka.util.Functional.isNotNull);
|
|
|
|
return {
|
|
id: context.adaptationSet.id || ('__fake__' + this.globalId_++),
|
|
contentType: context.adaptationSet.contentType,
|
|
language: language,
|
|
main: main,
|
|
streams: streams,
|
|
drmInfos: contentProtection.drmInfos,
|
|
trickModeFor: trickModeFor,
|
|
representationIds: repIds
|
|
};
|
|
};
|
|
|
|
|
|
/**
|
|
* 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 {string} label
|
|
* @param {boolean} isPrimary
|
|
* @param {!Array.<string>} roles
|
|
* @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, label, isPrimary, roles, node) {
|
|
var XmlUtils = shaka.util.XmlUtils;
|
|
var ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
|
|
context.representation = this.createFrame_(node, context.adaptationSet, null);
|
|
if (!this.verifyRepresentation_(context.representation)) {
|
|
shaka.log.warning('Skipping Representation', context.representation);
|
|
return null;
|
|
}
|
|
|
|
// NOTE: bandwidth is a mandatory attribute according to the spec, and zero
|
|
// does not make sense in the DASH spec's bandwidth formulas.
|
|
// In some content, however, the attribute is missing or zero.
|
|
// To avoid NaN at the variant level on broken content, fall back to zero.
|
|
// https://github.com/google/shaka-player/issues/938#issuecomment-317278180
|
|
context.bandwidth =
|
|
XmlUtils.parseAttr(node, 'bandwidth', XmlUtils.parsePositiveInt) || 0;
|
|
|
|
/** @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 == ContentType.TEXT ||
|
|
context.representation.contentType == 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,
|
|
scaledPresentationTimeOffset: 0
|
|
};
|
|
}
|
|
|
|
var contentProtectionElems = XmlUtils.findChildren(node, 'ContentProtection');
|
|
var keyId = shaka.dash.ContentProtection.parseFromRepresentation(
|
|
contentProtectionElems, this.config_.dash.customScheme,
|
|
contentProtection, this.config_.dash.ignoreDrmInfo);
|
|
|
|
return {
|
|
id: this.globalId_++,
|
|
createSegmentIndex: streamInfo.createSegmentIndex,
|
|
findSegmentPosition: streamInfo.findSegmentPosition,
|
|
getSegmentReference: streamInfo.getSegmentReference,
|
|
initSegmentReference: streamInfo.initSegmentReference,
|
|
presentationTimeOffset: streamInfo.scaledPresentationTimeOffset,
|
|
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,
|
|
label: label,
|
|
type: context.adaptationSet.contentType,
|
|
primary: isPrimary,
|
|
trickModeVideo: null,
|
|
containsEmsgBoxes: context.representation.containsEmsgBoxes,
|
|
roles: roles,
|
|
channelsCount: context.representation.numChannels
|
|
};
|
|
};
|
|
|
|
|
|
/**
|
|
* 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');
|
|
|
|
// Try updating again, but ensure we haven't been destroyed.
|
|
if (this.playerInterface_) {
|
|
// We will retry updating, so override the severity of the error.
|
|
error.severity = shaka.util.Error.Severity.RECOVERABLE;
|
|
this.playerInterface_.onError(error);
|
|
|
|
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) {
|
|
// NOTE: An updatePeriod_ of -1 means the attribute was missing.
|
|
// An attribute which is present and set to 0 should still result in periodic
|
|
// updates. For more, see: https://github.com/google/shaka-player/issues/331
|
|
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: '',
|
|
containsEmsgBoxes: false,
|
|
frameRate: undefined,
|
|
numChannels: null
|
|
});
|
|
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;
|
|
var containsEmsgBoxes =
|
|
!!XmlUtils.findChildren(elem, 'InbandEventStream').length;
|
|
var audioChannelConfigs =
|
|
XmlUtils.findChildren(elem, 'AudioChannelConfiguration');
|
|
var numChannels =
|
|
this.parseAudioChannels_(audioChannelConfigs) || parent.numChannels;
|
|
|
|
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,
|
|
containsEmsgBoxes: containsEmsgBoxes || parent.containsEmsgBoxes,
|
|
id: elem.getAttribute('id'),
|
|
numChannels: numChannels
|
|
};
|
|
};
|
|
|
|
|
|
/**
|
|
* @param {!Array.<!Element>} audioChannelConfigs an array of
|
|
* AudioChannelConfiguration elements
|
|
* @return {?number} the number of audio channels, or null if unknown
|
|
* @private
|
|
*/
|
|
shaka.dash.DashParser.prototype.parseAudioChannels_ =
|
|
function(audioChannelConfigs) {
|
|
for (var i = 0; i < audioChannelConfigs.length; ++i) {
|
|
var elem = audioChannelConfigs[i];
|
|
|
|
var scheme = elem.getAttribute('schemeIdUri');
|
|
if (!scheme) continue;
|
|
|
|
var value = elem.getAttribute('value');
|
|
if (!value) continue;
|
|
|
|
switch (scheme) {
|
|
case 'urn:mpeg:dash:outputChannelPositionList:2012':
|
|
// A space-separated list of speaker positions, so num channels is the
|
|
// length of this list.
|
|
return value.trim().split(/ +/).length;
|
|
|
|
case 'urn:mpeg:dash:23003:3:audio_channel_configuration:2011':
|
|
case 'urn:dts:dash:audio_channel_configuration:2012':
|
|
// As far as we can tell, this is a number of channels.
|
|
var intValue = parseInt(value, 10);
|
|
if (!intValue) { // 0 or NaN
|
|
shaka.log.warning('Channel parsing failure! ' +
|
|
'Ignoring scheme and value', scheme, value);
|
|
continue;
|
|
}
|
|
return intValue;
|
|
|
|
case 'tag:dolby.com,2014:dash:audio_channel_configuration:2011':
|
|
case 'urn:dolby:dash:audio_channel_configuration:2011':
|
|
// A hex-encoded 16-bit integer, in which each bit represents a channel.
|
|
var hexValue = parseInt(value, 16);
|
|
if (!hexValue) { // 0 or NaN
|
|
shaka.log.warning('Channel parsing failure! ' +
|
|
'Ignoring scheme and value', scheme, value);
|
|
continue;
|
|
}
|
|
// Count the 1-bits in hexValue.
|
|
var numBits = 0;
|
|
while (hexValue) {
|
|
if (hexValue & 1) ++numBits;
|
|
hexValue >>= 1;
|
|
}
|
|
return numBits;
|
|
|
|
default:
|
|
shaka.log.warning('Unrecognized audio channel scheme:', scheme, value);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
return null;
|
|
};
|
|
|
|
|
|
/**
|
|
* 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 ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
|
|
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 == ContentType.TEXT ||
|
|
frame.contentType == 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; });
|
|
};
|
|
|
|
|
|
/**
|
|
* 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.MimeUtils.getFullType(mimeType, codecs);
|
|
|
|
if (shaka.text.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 shaka.util.ManifestParserUtils.ContentType.TEXT;
|
|
}
|
|
|
|
// Otherwise, just split the MIME type. This handles video and audio
|
|
// types well.
|
|
return mimeType.split('/')[0];
|
|
};
|
|
|
|
|
|
shaka.media.ManifestParser.registerParserByExtension(
|
|
'mpd', shaka.dash.DashParser);
|
|
shaka.media.ManifestParser.registerParserByMime(
|
|
'application/dash+xml', shaka.dash.DashParser);
|
|
|