/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.dash.DashParser');
goog.require('goog.asserts');
goog.require('shaka.Deprecate');
goog.require('shaka.abr.Ewma');
goog.require('shaka.dash.ContentProtection');
goog.require('shaka.dash.MpdUtils');
goog.require('shaka.dash.SegmentBase');
goog.require('shaka.dash.SegmentList');
goog.require('shaka.dash.SegmentTemplate');
goog.require('shaka.log');
goog.require('shaka.media.Capabilities');
goog.require('shaka.media.ManifestParser');
goog.require('shaka.media.PresentationTimeline');
goog.require('shaka.media.SegmentIndex');
goog.require('shaka.media.SegmentUtils');
goog.require('shaka.net.NetworkingEngine');
goog.require('shaka.text.TextEngine');
goog.require('shaka.util.ContentSteeringManager');
goog.require('shaka.util.Error');
goog.require('shaka.util.EventManager');
goog.require('shaka.util.Functional');
goog.require('shaka.util.LanguageUtils');
goog.require('shaka.util.ManifestParserUtils');
goog.require('shaka.util.MimeUtils');
goog.require('shaka.util.Networking');
goog.require('shaka.util.ObjectUtils');
goog.require('shaka.util.OperationManager');
goog.require('shaka.util.PeriodCombiner');
goog.require('shaka.util.PlayerConfiguration');
goog.require('shaka.util.StringUtils');
goog.require('shaka.util.Timer');
goog.require('shaka.util.TXml');
goog.require('shaka.util.XmlUtils');
/**
* Creates a new DASH parser.
*
* @implements {shaka.extern.ManifestParser}
* @export
*/
shaka.dash.DashParser = class {
/** Creates a new DASH parser. */
constructor() {
/** @private {?shaka.extern.ManifestConfiguration} */
this.config_ = null;
/** @private {?shaka.extern.ManifestParser.PlayerInterface} */
this.playerInterface_ = null;
/** @private {!Array.<string>} */
this.manifestUris_ = [];
/** @private {?shaka.extern.Manifest} */
this.manifest_ = null;
/** @private {number} */
this.globalId_ = 1;
/** @private {!Array<shaka.extern.xml.Node>} */
this.patchLocationNodes_ = [];
/**
* A context of the living manifest used for processing
* Patch MPD's
* @private {!shaka.dash.DashParser.PatchContext}
*/
this.manifestPatchContext_ = {
mpdId: '',
type: '',
profiles: [],
mediaPresentationDuration: null,
availabilityTimeOffset: 0,
getBaseUris: null,
publishTime: 0,
};
/**
* This is a cache is used the store a snapshot of the context
* object which is built up throughout node traversal to maintain
* a current state. This data needs to be preserved for parsing
* patches.
* The key is a combination period and representation id's.
* @private {!Map<string, !shaka.dash.DashParser.Context>}
*/
this.contextCache_ = new Map();
/**
* A map of IDs to Stream objects.
* ID: Period@id,Representation@id
* e.g.: '1,23'
* @private {!Object.<string, !shaka.extern.Stream>}
*/
this.streamMap_ = {};
/**
* A map of Period IDs to Stream Map IDs.
* Use to have direct access to streamMap key.
* @private {!Object.<string, !Array<string>>}
*/
this.indexStreamMap_ = {};
/**
* A map of period ids to their durations
* @private {!Object.<string, number>}
*/
this.periodDurations_ = {};
/** @private {shaka.util.PeriodCombiner} */
this.periodCombiner_ = new shaka.util.PeriodCombiner();
/**
* The update period in seconds, or 0 for no updates.
* @private {number}
*/
this.updatePeriod_ = 0;
/**
* An ewma that tracks how long updates take.
* This is to mitigate issues caused by slow parsing on embedded devices.
* @private {!shaka.abr.Ewma}
*/
this.averageUpdateDuration_ = new shaka.abr.Ewma(5);
/** @private {shaka.util.Timer} */
this.updateTimer_ = new shaka.util.Timer(() => {
if (this.mediaElement_ && !this.config_.continueLoadingWhenPaused) {
this.eventManager_.unlisten(this.mediaElement_, 'timeupdate');
if (this.mediaElement_.paused) {
this.eventManager_.listenOnce(
this.mediaElement_, 'timeupdate', () => this.onUpdate_());
return;
}
}
this.onUpdate_();
});
/** @private {!shaka.util.OperationManager} */
this.operationManager_ = new shaka.util.OperationManager();
/**
* Largest period start time seen.
* @private {?number}
*/
this.largestPeriodStartTime_ = null;
/**
* Period IDs seen in previous manifest.
* @private {!Array.<string>}
*/
this.lastManifestUpdatePeriodIds_ = [];
/**
* The minimum of the availabilityTimeOffset values among the adaptation
* sets.
* @private {number}
*/
this.minTotalAvailabilityTimeOffset_ = Infinity;
/** @private {boolean} */
this.lowLatencyMode_ = false;
/** @private {?shaka.util.ContentSteeringManager} */
this.contentSteeringManager_ = null;
/** @private {number} */
this.gapCount_ = 0;
/** @private {boolean} */
this.isLowLatency_ = false;
/** @private {shaka.util.EventManager} */
this.eventManager_ = new shaka.util.EventManager();
/** @private {HTMLMediaElement} */
this.mediaElement_ = null;
/** @private {boolean} */
this.isTransitionFromDynamicToStatic_ = false;
}
/**
* @override
* @exportInterface
*/
configure(config) {
goog.asserts.assert(config.dash != null,
'DashManifestConfiguration should not be null!');
const needFireUpdate = this.playerInterface_ &&
config.dash.updatePeriod != this.config_.dash.updatePeriod &&
config.dash.updatePeriod >= 0;
this.config_ = config;
if (needFireUpdate && this.manifest_ &&
this.manifest_.presentationTimeline.isLive()) {
this.updateNow_();
}
if (this.contentSteeringManager_) {
this.contentSteeringManager_.configure(this.config_);
}
if (this.periodCombiner_) {
this.periodCombiner_.setAllowMultiTypeVariants(
this.config_.dash.multiTypeVariantsAllowed &&
shaka.media.Capabilities.isChangeTypeSupported());
this.periodCombiner_.setUseStreamOnce(
this.config_.dash.useStreamOnceInPeriodFlattening);
}
}
/**
* @override
* @exportInterface
*/
async start(uri, playerInterface) {
goog.asserts.assert(this.config_, 'Must call configure() before start()!');
this.lowLatencyMode_ = playerInterface.isLowLatencyMode();
this.manifestUris_ = [uri];
this.playerInterface_ = playerInterface;
const updateDelay = await this.requestManifest_();
if (this.playerInterface_) {
this.setUpdateTimer_(updateDelay);
}
// Make sure that the parser has not been destroyed.
if (!this.playerInterface_) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.PLAYER,
shaka.util.Error.Code.OPERATION_ABORTED);
}
goog.asserts.assert(this.manifest_, 'Manifest should be non-null!');
return this.manifest_;
}
/**
* @override
* @exportInterface
*/
stop() {
// When the parser stops, release all segment indexes, which stops their
// timers, as well.
for (const stream of Object.values(this.streamMap_)) {
if (stream.segmentIndex) {
stream.segmentIndex.release();
}
}
if (this.periodCombiner_) {
this.periodCombiner_.release();
}
this.playerInterface_ = null;
this.config_ = null;
this.manifestUris_ = [];
this.manifest_ = null;
this.streamMap_ = {};
this.indexStreamMap_ = {};
this.contextCache_.clear();
this.manifestPatchContext_ = {
mpdId: '',
type: '',
profiles: [],
mediaPresentationDuration: null,
availabilityTimeOffset: 0,
getBaseUris: null,
publishTime: 0,
};
this.periodCombiner_ = null;
if (this.updateTimer_ != null) {
this.updateTimer_.stop();
this.updateTimer_ = null;
}
if (this.contentSteeringManager_) {
this.contentSteeringManager_.destroy();
}
if (this.eventManager_) {
this.eventManager_.release();
this.eventManager_ = null;
}
return this.operationManager_.destroy();
}
/**
* @override
* @exportInterface
*/
async update() {
try {
await this.requestManifest_();
} catch (error) {
if (!this.playerInterface_ || !error) {
return;
}
goog.asserts.assert(error instanceof shaka.util.Error, 'Bad error type');
this.playerInterface_.onError(error);
}
}
/**
* @override
* @exportInterface
*/
onExpirationUpdated(sessionId, expiration) {
// No-op
}
/**
* @override
* @exportInterface
*/
onInitialVariantChosen(variant) {
// For live it is necessary that the first time we update the manifest with
// a shorter time than indicated to take into account that the last segment
// added could be halfway, for example
if (this.manifest_ && this.manifest_.presentationTimeline.isLive()) {
const stream = variant.video || variant.audio;
if (stream && stream.segmentIndex) {
const availabilityEnd =
this.manifest_.presentationTimeline.getSegmentAvailabilityEnd();
const position = stream.segmentIndex.find(availabilityEnd);
if (position == null) {
return;
}
const reference = stream.segmentIndex.get(position);
if (!reference) {
return;
}
this.updatePeriod_ = reference.endTime - availabilityEnd;
this.setUpdateTimer_(/* offset= */ 0);
}
}
}
/**
* @override
* @exportInterface
*/
banLocation(uri) {
if (this.contentSteeringManager_) {
this.contentSteeringManager_.banLocation(uri);
}
}
/**
* @override
* @exportInterface
*/
setMediaElement(mediaElement) {
this.mediaElement_ = mediaElement;
}
/**
* Makes a network request for the manifest and parses the resulting data.
*
* @return {!Promise.<number>} Resolves with the time it took, in seconds, to
* fulfill the request and parse the data.
* @private
*/
async requestManifest_() {
const requestType = shaka.net.NetworkingEngine.RequestType.MANIFEST;
let type = shaka.net.NetworkingEngine.AdvancedRequestType.MPD;
let rootElement = 'MPD';
const patchLocationUris = this.getPatchLocationUris_();
let manifestUris = this.manifestUris_;
if (patchLocationUris.length) {
manifestUris = patchLocationUris;
rootElement = 'Patch';
type = shaka.net.NetworkingEngine.AdvancedRequestType.MPD_PATCH;
} else if (this.manifestUris_.length > 1 && this.contentSteeringManager_) {
const locations = this.contentSteeringManager_.getLocations(
'Location', /* ignoreBaseUrls= */ true);
if (locations.length) {
manifestUris = locations;
}
}
const request = shaka.net.NetworkingEngine.makeRequest(
manifestUris, this.config_.retryParameters);
const startTime = Date.now();
const response = await this.makeNetworkRequest_(
request, requestType, {type});
// Detect calls to stop().
if (!this.playerInterface_) {
return 0;
}
// For redirections add the response uri to the first entry in the
// Manifest Uris array.
if (response.uri && response.uri != response.originalUri &&
!this.manifestUris_.includes(response.uri)) {
this.manifestUris_.unshift(response.uri);
}
// This may throw, but it will result in a failed promise.
await this.parseManifest_(response.data, response.uri, rootElement);
// Keep track of how long the longest manifest update took.
const endTime = Date.now();
const updateDuration = (endTime - startTime) / 1000.0;
this.averageUpdateDuration_.sample(1, updateDuration);
// Let the caller know how long this update took.
return updateDuration;
}
/**
* Parses the manifest XML. This also handles updates and will update the
* stored manifest.
*
* @param {BufferSource} data
* @param {string} finalManifestUri The final manifest URI, which may
* differ from this.manifestUri_ if there has been a redirect.
* @param {string} rootElement MPD or Patch, depending on context
* @return {!Promise}
* @private
*/
async parseManifest_(data, finalManifestUri, rootElement) {
let manifestData = data;
const manifestPreprocessor = this.config_.dash.manifestPreprocessor;
const defaultManifestPreprocessor =
shaka.util.PlayerConfiguration.defaultManifestPreprocessor;
if (manifestPreprocessor != defaultManifestPreprocessor) {
shaka.Deprecate.deprecateFeature(5,
'manifest.dash.manifestPreprocessor configuration',
'Please Use manifest.dash.manifestPreprocessorTXml instead.');
const mpdElement =
shaka.util.XmlUtils.parseXml(manifestData, rootElement);
if (!mpdElement) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.DASH_INVALID_XML,
finalManifestUri);
}
manifestPreprocessor(mpdElement);
manifestData = shaka.util.XmlUtils.toArrayBuffer(mpdElement);
}
const mpd = shaka.util.TXml.parseXml(manifestData, rootElement);
if (!mpd) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.DASH_INVALID_XML,
finalManifestUri);
}
const manifestPreprocessorTXml =
this.config_.dash.manifestPreprocessorTXml;
const defaultManifestPreprocessorTXml =
shaka.util.PlayerConfiguration.defaultManifestPreprocessorTXml;
if (manifestPreprocessorTXml != defaultManifestPreprocessorTXml) {
manifestPreprocessorTXml(mpd);
}
if (rootElement === 'Patch') {
return this.processPatchManifest_(mpd);
}
const disableXlinkProcessing = this.config_.dash.disableXlinkProcessing;
if (disableXlinkProcessing) {
return this.processManifest_(mpd, finalManifestUri);
}
// Process the mpd to account for xlink connections.
const failGracefully = this.config_.dash.xlinkFailGracefully;
const xlinkOperation = shaka.dash.MpdUtils.processXlinks(
mpd, this.config_.retryParameters, failGracefully, finalManifestUri,
this.playerInterface_.networkingEngine);
this.operationManager_.manage(xlinkOperation);
const finalMpd = await xlinkOperation.promise;
return this.processManifest_(finalMpd, finalManifestUri);
}
/**
* Takes a formatted MPD and converts it into a manifest.
*
* @param {!shaka.extern.xml.Node} mpd
* @param {string} finalManifestUri The final manifest URI, which may
* differ from this.manifestUri_ if there has been a redirect.
* @return {!Promise}
* @private
*/
async processManifest_(mpd, finalManifestUri) {
const TXml = shaka.util.TXml;
goog.asserts.assert(this.config_,
'Must call configure() before processManifest_()!');
if (this.contentSteeringManager_) {
this.contentSteeringManager_.clearPreviousLocations();
}
// Get any Location elements. This will update the manifest location and
// the base URI.
/** @type {!Array.<string>} */
let manifestBaseUris = [finalManifestUri];
/** @type {!Array.<string>} */
const locations = [];
/** @type {!Map.<string, string>} */
const locationsMapping = new Map();
const locationsObjs = TXml.findChildren(mpd, 'Location');
for (const locationsObj of locationsObjs) {
const serviceLocation = locationsObj.attributes['serviceLocation'];
const uri = TXml.getContents(locationsObj);
if (!uri) {
continue;
}
const finalUri = shaka.util.ManifestParserUtils.resolveUris(
manifestBaseUris, [uri])[0];
if (serviceLocation) {
if (this.contentSteeringManager_) {
this.contentSteeringManager_.addLocation(
'Location', serviceLocation, finalUri);
} else {
locationsMapping.set(serviceLocation, finalUri);
}
}
locations.push(finalUri);
}
if (this.contentSteeringManager_) {
const steeringlocations = this.contentSteeringManager_.getLocations(
'Location', /* ignoreBaseUrls= */ true);
if (steeringlocations.length > 0) {
this.manifestUris_ = steeringlocations;
manifestBaseUris = steeringlocations;
}
} else if (locations.length) {
this.manifestUris_ = locations;
manifestBaseUris = locations;
}
this.manifestPatchContext_.mpdId = mpd.attributes['id'] || '';
this.manifestPatchContext_.publishTime =
TXml.parseAttr(mpd, 'publishTime', TXml.parseDate) || 0;
this.patchLocationNodes_ = TXml.findChildren(mpd, 'PatchLocation');
let contentSteeringPromise = Promise.resolve();
const contentSteering = TXml.findChild(mpd, 'ContentSteering');
if (contentSteering && this.playerInterface_) {
const defaultPathwayId =
contentSteering.attributes['defaultServiceLocation'];
if (!this.contentSteeringManager_) {
this.contentSteeringManager_ =
new shaka.util.ContentSteeringManager(this.playerInterface_);
this.contentSteeringManager_.configure(this.config_);
this.contentSteeringManager_.setManifestType(
shaka.media.ManifestParser.DASH);
this.contentSteeringManager_.setBaseUris(manifestBaseUris);
this.contentSteeringManager_.setDefaultPathwayId(defaultPathwayId);
const uri = TXml.getContents(contentSteering);
if (uri) {
const queryBeforeStart =
TXml.parseAttr(contentSteering, 'queryBeforeStart',
TXml.parseBoolean, /* defaultValue= */ false);
if (queryBeforeStart) {
contentSteeringPromise =
this.contentSteeringManager_.requestInfo(uri);
} else {
this.contentSteeringManager_.requestInfo(uri);
}
}
} else {
this.contentSteeringManager_.setBaseUris(manifestBaseUris);
this.contentSteeringManager_.setDefaultPathwayId(defaultPathwayId);
}
for (const serviceLocation of locationsMapping.keys()) {
const uri = locationsMapping.get(serviceLocation);
this.contentSteeringManager_.addLocation(
'Location', serviceLocation, uri);
}
}
const uriObjs = TXml.findChildren(mpd, 'BaseURL');
let calculatedBaseUris;
let someLocationValid = false;
if (this.contentSteeringManager_) {
for (const uriObj of uriObjs) {
const serviceLocation = uriObj.attributes['serviceLocation'];
const uri = TXml.getContents(uriObj);
if (serviceLocation && uri) {
this.contentSteeringManager_.addLocation(
'BaseURL', serviceLocation, uri);
someLocationValid = true;
}
}
}
if (!someLocationValid || !this.contentSteeringManager_) {
const uris = uriObjs.map(TXml.getContents);
calculatedBaseUris = shaka.util.ManifestParserUtils.resolveUris(
manifestBaseUris, uris);
}
const getBaseUris = () => {
if (this.contentSteeringManager_ && someLocationValid) {
return this.contentSteeringManager_.getLocations('BaseURL');
}
if (calculatedBaseUris) {
return calculatedBaseUris;
}
return [];
};
this.manifestPatchContext_.getBaseUris = getBaseUris;
let availabilityTimeOffset = 0;
if (uriObjs && uriObjs.length) {
availabilityTimeOffset = TXml.parseAttr(uriObjs[0],
'availabilityTimeOffset', TXml.parseFloat) || 0;
}
this.manifestPatchContext_.availabilityTimeOffset = availabilityTimeOffset;
const ignoreMinBufferTime = this.config_.dash.ignoreMinBufferTime;
let minBufferTime = 0;
if (!ignoreMinBufferTime) {
minBufferTime =
TXml.parseAttr(mpd, 'minBufferTime', TXml.parseDuration) || 0;
}
this.updatePeriod_ = /** @type {number} */ (TXml.parseAttr(
mpd, 'minimumUpdatePeriod', TXml.parseDuration, -1));
const presentationStartTime = TXml.parseAttr(
mpd, 'availabilityStartTime', TXml.parseDate);
let segmentAvailabilityDuration = TXml.parseAttr(
mpd, 'timeShiftBufferDepth', TXml.parseDuration);
const ignoreSuggestedPresentationDelay =
this.config_.dash.ignoreSuggestedPresentationDelay;
let suggestedPresentationDelay = null;
if (!ignoreSuggestedPresentationDelay) {
suggestedPresentationDelay = TXml.parseAttr(
mpd, 'suggestedPresentationDelay', TXml.parseDuration);
}
const ignoreMaxSegmentDuration =
this.config_.dash.ignoreMaxSegmentDuration;
let maxSegmentDuration = null;
if (!ignoreMaxSegmentDuration) {
maxSegmentDuration = TXml.parseAttr(
mpd, 'maxSegmentDuration', TXml.parseDuration);
}
const mpdType = mpd.attributes['type'] || 'static';
if (this.manifest_ && this.manifest_.presentationTimeline) {
this.isTransitionFromDynamicToStatic_ =
this.manifest_.presentationTimeline.isLive() && mpdType == 'static';
}
this.manifestPatchContext_.type = mpdType;
this.cleanStreamMap_();
/** @type {!shaka.media.PresentationTimeline} */
let presentationTimeline;
if (this.manifest_) {
presentationTimeline = this.manifest_.presentationTimeline;
// Before processing an update, evict from all segment indexes. Some of
// them may not get updated otherwise if their corresponding Period
// element has been dropped from the manifest since the last update.
// Without this, playback will still work, but this is necessary to
// maintain conditions that we assert on for multi-Period content.
// This gives us confidence that our state is maintained correctly, and
// that the complex logic of multi-Period eviction and period-flattening
// is correct. See also:
// https://github.com/shaka-project/shaka-player/issues/3169#issuecomment-823580634
for (const stream of Object.values(this.streamMap_)) {
if (stream.segmentIndex) {
stream.segmentIndex.evict(
presentationTimeline.getSegmentAvailabilityStart());
}
}
} else {
// DASH IOP v3.0 suggests using a default delay between minBufferTime
// and timeShiftBufferDepth. This is literally the range of all
// feasible choices for the value. Nothing older than
// timeShiftBufferDepth is still available, and anything less than
// minBufferTime will cause buffering issues.
//
// We have decided that our default will be the configured value, or
// 1.5 * minBufferTime if not configured. This is fairly conservative.
// Content providers should provide a suggestedPresentationDelay whenever
// possible to optimize the live streaming experience.
const defaultPresentationDelay =
this.config_.defaultPresentationDelay || minBufferTime * 1.5;
const presentationDelay = suggestedPresentationDelay != null ?
suggestedPresentationDelay : defaultPresentationDelay;
presentationTimeline = new shaka.media.PresentationTimeline(
presentationStartTime, presentationDelay,
this.config_.dash.autoCorrectDrift);
}
presentationTimeline.setStatic(mpdType == 'static');
const isLive = presentationTimeline.isLive();
// If it's live, we check for an override.
if (isLive && !isNaN(this.config_.availabilityWindowOverride)) {
segmentAvailabilityDuration = this.config_.availabilityWindowOverride;
}
// If it's null, that means segments are always available. This is always
// the case for VOD, and sometimes the case for live.
if (segmentAvailabilityDuration == null) {
segmentAvailabilityDuration = Infinity;
}
presentationTimeline.setSegmentAvailabilityDuration(
segmentAvailabilityDuration);
const profiles = mpd.attributes['profiles'] || '';
this.manifestPatchContext_.profiles = profiles.split(',');
/** @type {shaka.dash.DashParser.Context} */
const context = {
// Don't base on updatePeriod_ since emsg boxes can cause manifest
// updates.
dynamic: mpdType != 'static',
presentationTimeline: presentationTimeline,
period: null,
periodInfo: null,
adaptationSet: null,
representation: null,
bandwidth: 0,
indexRangeWarningGiven: false,
availabilityTimeOffset: availabilityTimeOffset,
mediaPresentationDuration: null,
profiles: profiles.split(','),
roles: null,
};
this.gapCount_ = 0;
const periodsAndDuration = this.parsePeriods_(
context, getBaseUris, mpd, /* newPeriod= */ false);
const duration = periodsAndDuration.duration;
const periods = periodsAndDuration.periods;
if ((mpdType == 'static' && !this.isTransitionFromDynamicToStatic_) ||
!periodsAndDuration.durationDerivedFromPeriods) {
// Ignore duration calculated from Period lengths if this is dynamic.
presentationTimeline.setDuration(duration || Infinity);
}
// The segments are available earlier than the availability start time.
// If the stream is low latency and the user has not configured the
// lowLatencyMode, but if it has been configured to activate the
// lowLatencyMode if a stream of this type is detected, we automatically
// activate the lowLatencyMode.
if (this.isLowLatency_ && !this.lowLatencyMode_) {
const autoLowLatencyMode = this.playerInterface_.isAutoLowLatencyMode();
if (autoLowLatencyMode) {
this.playerInterface_.enableLowLatencyMode();
this.lowLatencyMode_ = this.playerInterface_.isLowLatencyMode();
}
}
if (this.lowLatencyMode_) {
presentationTimeline.setAvailabilityTimeOffset(
this.minTotalAvailabilityTimeOffset_);
}
// Use @maxSegmentDuration to override smaller, derived values.
presentationTimeline.notifyMaxSegmentDuration(maxSegmentDuration || 1);
if (goog.DEBUG && !this.isTransitionFromDynamicToStatic_) {
presentationTimeline.assertIsValid();
}
await contentSteeringPromise;
// Set minBufferTime to 0 for low-latency DASH live stream to achieve the
// best latency
if (this.lowLatencyMode_) {
minBufferTime = 0;
const presentationDelay = suggestedPresentationDelay != null ?
suggestedPresentationDelay : this.config_.defaultPresentationDelay;
presentationTimeline.setDelay(presentationDelay);
}
// These steps are not done on manifest update.
if (!this.manifest_) {
await this.periodCombiner_.combinePeriods(periods, context.dynamic);
this.manifest_ = {
presentationTimeline: presentationTimeline,
variants: this.periodCombiner_.getVariants(),
textStreams: this.periodCombiner_.getTextStreams(),
imageStreams: this.periodCombiner_.getImageStreams(),
offlineSessionIds: [],
minBufferTime: minBufferTime || 0,
sequenceMode: this.config_.dash.sequenceMode,
ignoreManifestTimestampsInSegmentsMode: false,
type: shaka.media.ManifestParser.DASH,
serviceDescription: this.parseServiceDescription_(mpd),
nextUrl: this.parseMpdChaining_(mpd),
periodCount: periods.length,
gapCount: this.gapCount_,
isLowLatency: this.isLowLatency_,
};
// We only need to do clock sync when we're using presentation start
// time. This condition also excludes VOD streams.
if (presentationTimeline.usingPresentationStartTime()) {
const TXml = shaka.util.TXml;
const timingElements = TXml.findChildren(mpd, 'UTCTiming');
const offset = await this.parseUtcTiming_(getBaseUris, timingElements);
// Detect calls to stop().
if (!this.playerInterface_) {
return;
}
presentationTimeline.setClockOffset(offset);
}
// This is the first point where we have a meaningful presentation start
// time, and we need to tell PresentationTimeline that so that it can
// maintain consistency from here on.
presentationTimeline.lockStartTime();
} else {
this.manifest_.periodCount = periods.length;
this.manifest_.gapCount = this.gapCount_;
await this.postPeriodProcessing_(periods, /* isPatchUpdate= */ false);
}
// Add text streams to correspond to closed captions. This happens right
// after period combining, while we still have a direct reference, so that
// any new streams will appear in the period combiner.
this.playerInterface_.makeTextStreamsForClosedCaptions(this.manifest_);
}
/**
* Handles common procedures after processing new periods.
*
* @param {!Array<shaka.extern.Period>} periods to be appended
* @param {boolean} isPatchUpdate does call comes from mpd patch update
* @private
*/
async postPeriodProcessing_(periods, isPatchUpdate) {
await this.periodCombiner_.combinePeriods(periods, true, isPatchUpdate);
// Just update the variants and text streams, which may change as periods
// are added or removed.
this.manifest_.variants = this.periodCombiner_.getVariants();
const textStreams = this.periodCombiner_.getTextStreams();
if (textStreams.length > 0) {
this.manifest_.textStreams = textStreams;
}
this.manifest_.imageStreams = this.periodCombiner_.getImageStreams();
// Re-filter the manifest. This will check any configured restrictions on
// new variants, and will pass any new init data to DrmEngine to ensure
// that key rotation works correctly.
this.playerInterface_.filter(this.manifest_);
}
/**
* Takes a formatted Patch MPD and converts it into a manifest.
*
* @param {!shaka.extern.xml.Node} mpd
* @return {!Promise}
* @private
*/
async processPatchManifest_(mpd) {
const TXml = shaka.util.TXml;
const mpdId = mpd.attributes['mpdId'];
const originalPublishTime = TXml.parseAttr(mpd, 'originalPublishTime',
TXml.parseDate);
if (!mpdId || mpdId !== this.manifestPatchContext_.mpdId ||
originalPublishTime !== this.manifestPatchContext_.publishTime) {
// Clean patch location nodes, so it will force full MPD update.
this.patchLocationNodes_ = [];
throw new shaka.util.Error(
shaka.util.Error.Severity.RECOVERABLE,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.DASH_INVALID_PATCH);
}
/** @type {!Array<shaka.extern.Period>} */
const newPeriods = [];
/** @type {!Array<shaka.extern.xml.Node>} */
const periodAdditions = [];
/** @type {!Set<string>} */
const modifiedTimelines = new Set();
for (const patchNode of TXml.getChildNodes(mpd)) {
let handled = true;
const paths = TXml.parseXpath(patchNode.attributes['sel'] || '');
const node = paths[paths.length - 1];
const content = TXml.getContents(patchNode) || '';
if (node.name === 'MPD') {
if (node.attribute === 'mediaPresentationDuration') {
const content = TXml.getContents(patchNode) || '';
this.parsePatchMediaPresentationDurationChange_(content);
} else if (node.attribute === 'type') {
this.parsePatchMpdTypeChange_(content);
} else if (node.attribute === 'publishTime') {
this.manifestPatchContext_.publishTime = TXml.parseDate(content) || 0;
} else if (node.attribute === null && patchNode.tagName === 'add') {
periodAdditions.push(patchNode);
} else {
handled = false;
}
} else if (node.name === 'PatchLocation') {
this.updatePatchLocationNodes_(patchNode);
} else if (node.name === 'Period') {
if (patchNode.tagName === 'add') {
periodAdditions.push(patchNode);
} else if (patchNode.tagName === 'remove' && node.id) {
this.removePatchPeriod_(node.id);
}
} else if (node.name === 'SegmentTemplate') {
const timelines = this.modifySegmentTemplate_(patchNode);
for (const timeline of timelines) {
modifiedTimelines.add(timeline);
}
} else if (node.name === 'SegmentTimeline' || node.name === 'S') {
const timelines = this.modifyTimepoints_(patchNode);
for (const timeline of timelines) {
modifiedTimelines.add(timeline);
}
} else {
handled = false;
}
if (!handled) {
shaka.log.warning('Unhandled ' + patchNode.tagName + ' operation',
patchNode.attributes['sel']);
}
}
for (const timeline of modifiedTimelines) {
this.parsePatchSegment_(timeline);
}
// Add new periods after extending timelines, as new periods
// remove context cache of previous periods.
for (const periodAddition of periodAdditions) {
newPeriods.push(...this.parsePatchPeriod_(periodAddition));
}
if (newPeriods.length) {
this.manifest_.periodCount += newPeriods.length;
this.manifest_.gapCount = this.gapCount_;
await this.postPeriodProcessing_(newPeriods, /* isPatchUpdate= */ true);
}
if (this.manifestPatchContext_.type == 'static') {
const duration = this.manifestPatchContext_.mediaPresentationDuration;
this.manifest_.presentationTimeline.setDuration(duration || Infinity);
}
}
/**
* Handles manifest type changes, this transition is expected to be
* "dyanmic" to "static".
*
* @param {!string} mpdType
* @private
*/
parsePatchMpdTypeChange_(mpdType) {
this.manifest_.presentationTimeline.setStatic(mpdType == 'static');
this.manifestPatchContext_.type = mpdType;
for (const context of this.contextCache_.values()) {
context.dynamic = mpdType == 'dynamic';
}
if (mpdType == 'static') {
// Manifest is no longer dynamic, so stop live updates.
this.updatePeriod_ = -1;
}
}
/**
* @param {string} durationString
* @private
*/
parsePatchMediaPresentationDurationChange_(durationString) {
const duration = shaka.util.TXml.parseDuration(durationString);
if (duration == null) {
return;
}
this.manifestPatchContext_.mediaPresentationDuration = duration;
for (const context of this.contextCache_.values()) {
context.mediaPresentationDuration = duration;
}
}
/**
* Ingests a full MPD period element from a patch update
*
* @param {!shaka.extern.xml.Node} periods
* @private
*/
parsePatchPeriod_(periods) {
goog.asserts.assert(this.manifestPatchContext_.getBaseUris,
'Must provide getBaseUris on manifestPatchContext_');
/** @type {shaka.dash.DashParser.Context} */
const context = {
dynamic: this.manifestPatchContext_.type == 'dynamic',
presentationTimeline: this.manifest_.presentationTimeline,
period: null,
periodInfo: null,
adaptationSet: null,
representation: null,
bandwidth: 0,
indexRangeWarningGiven: false,
availabilityTimeOffset: this.manifestPatchContext_.availabilityTimeOffset,
profiles: this.manifestPatchContext_.profiles,
mediaPresentationDuration:
this.manifestPatchContext_.mediaPresentationDuration,
roles: null,
};
const periodsAndDuration = this.parsePeriods_(context,
this.manifestPatchContext_.getBaseUris, periods, /* newPeriod= */ true);
return periodsAndDuration.periods;
}
/**
* @param {string} periodId
* @private
*/
removePatchPeriod_(periodId) {
const SegmentTemplate = shaka.dash.SegmentTemplate;
this.manifest_.periodCount--;
for (const contextId of this.contextCache_.keys()) {
if (contextId.startsWith(periodId)) {
const context = this.contextCache_.get(contextId);
SegmentTemplate.removeTimepoints(context);
this.parsePatchSegment_(contextId);
this.contextCache_.delete(contextId);
}
}
const newPeriods = this.lastManifestUpdatePeriodIds_.filter((pID) => {
return pID !== periodId;
});
this.lastManifestUpdatePeriodIds_ = newPeriods;
}
/**
* @param {!Array<shaka.util.TXml.PathNode>} paths
* @return {!Array<string>}
* @private
*/
getContextIdsFromPath_(paths) {
let periodId = '';
let adaptationSetId = '';
let adaptationSetPosition = -1;
let representationId = '';
for (const node of paths) {
if (node.name === 'Period') {
periodId = node.id;
} else if (node.name === 'AdaptationSet') {
adaptationSetId = node.id;
if (node.position !== null) {
adaptationSetPosition = node.position;
}
} else if (node.name === 'Representation') {
representationId = node.id;
}
}
/** @type {!Array<string>} */
const contextIds = [];
if (representationId) {
contextIds.push(periodId + ',' + representationId);
} else {
if (adaptationSetId) {
for (const context of this.contextCache_.values()) {
if (context.period.id === periodId &&
context.adaptationSet.id === adaptationSetId &&
context.representation.id) {
contextIds.push(periodId + ',' + context.representation.id);
}
}
} else {
if (adaptationSetPosition > -1) {
for (const context of this.contextCache_.values()) {
if (context.period.id === periodId &&
context.adaptationSet.position === adaptationSetPosition &&
context.representation.id) {
contextIds.push(periodId + ',' + context.representation.id);
}
}
}
}
}
return contextIds;
}
/**
* Modifies SegmentTemplate based on MPD patch.
*
* @param {!shaka.extern.xml.Node} patchNode
* @return {!Array<string>} context ids with updated timeline
* @private
*/
modifySegmentTemplate_(patchNode) {
const TXml = shaka.util.TXml;
const paths = TXml.parseXpath(patchNode.attributes['sel'] || '');
const lastPath = paths[paths.length - 1];
if (!lastPath.attribute) {
return [];
}
const contextIds = this.getContextIdsFromPath_(paths);
const content = TXml.getContents(patchNode) || '';
for (const contextId of contextIds) {
/** @type {shaka.dash.DashParser.Context} */
const context = this.contextCache_.get(contextId);
goog.asserts.assert(context && context.representation.segmentTemplate,
'cannot modify segment template');
TXml.modifyNodeAttribute(context.representation.segmentTemplate,
patchNode.tagName, lastPath.attribute, content);
}
return contextIds;
}
/**
* Ingests Patch MPD segments into timeline.
*
* @param {!shaka.extern.xml.Node} patchNode
* @return {!Array<string>} context ids with updated timeline
* @private
*/
modifyTimepoints_(patchNode) {
const TXml = shaka.util.TXml;
const SegmentTemplate = shaka.dash.SegmentTemplate;
const paths = TXml.parseXpath(patchNode.attributes['sel'] || '');
const contextIds = this.getContextIdsFromPath_(paths);
for (const contextId of contextIds) {
/** @type {shaka.dash.DashParser.Context} */
const context = this.contextCache_.get(contextId);
SegmentTemplate.modifyTimepoints(context, patchNode);
}
return contextIds;
}
/**
* Parses modified segments.
*
* @param {string} contextId
* @private
*/
parsePatchSegment_(contextId) {
/** @type {shaka.dash.DashParser.Context} */
const context = this.contextCache_.get(contextId);
const currentStream = this.streamMap_[contextId];
goog.asserts.assert(currentStream, 'stream should exist');
if (currentStream.segmentIndex) {
currentStream.segmentIndex.evict(
this.manifest_.presentationTimeline.getSegmentAvailabilityStart());
}
try {
const requestSegment = (uris, startByte, endByte, isInit) => {
return this.requestSegment_(uris, startByte, endByte, isInit);
};
// TODO we should obtain lastSegmentNumber if possible
const streamInfo = shaka.dash.SegmentTemplate.createStreamInfo(
context, requestSegment, this.streamMap_, /* isUpdate= */ true,
this.config_.dash.initialSegmentLimit, this.periodDurations_,
context.representation.aesKey, /* lastSegmentNumber= */ null,
/* isPatchUpdate= */ true);
currentStream.createSegmentIndex = async () => {
if (!currentStream.segmentIndex) {
currentStream.segmentIndex =
await streamInfo.generateSegmentIndex();
}
};
} catch (error) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
const contentType = context.representation.contentType;
const isText = contentType == ContentType.TEXT ||
contentType == ContentType.APPLICATION;
const isImage = contentType == ContentType.IMAGE;
if (!(isText || isImage) ||
error.code != shaka.util.Error.Code.DASH_NO_SEGMENT_INFO) {
// We will ignore any DASH_NO_SEGMENT_INFO errors for text/image
throw error;
}
}
}
/**
* Reads maxLatency and maxPlaybackRate properties from service
* description element.
*
* @param {!shaka.extern.xml.Node} mpd
* @return {?shaka.extern.ServiceDescription}
* @private
*/
parseServiceDescription_(mpd) {
const TXml = shaka.util.TXml;
const elem = TXml.findChild(mpd, 'ServiceDescription');
if (!elem ) {
return null;
}
const latencyNode = TXml.findChild(elem, 'Latency');
const playbackRateNode = TXml.findChild(elem, 'PlaybackRate');
if (!latencyNode && !playbackRateNode) {
return null;
}
const description = {};
if (latencyNode) {
if ('target' in latencyNode.attributes) {
description.targetLatency =
parseInt(latencyNode.attributes['target'], 10) / 1000;
}
if ('max' in latencyNode.attributes) {
description.maxLatency =
parseInt(latencyNode.attributes['max'], 10) / 1000;
}
if ('min' in latencyNode.attributes) {
description.minLatency =
parseInt(latencyNode.attributes['min'], 10) / 1000;
}
}
if (playbackRateNode) {
if ('max' in playbackRateNode.attributes) {
description.maxPlaybackRate =
parseFloat(playbackRateNode.attributes['max']);
}
if ('min' in playbackRateNode.attributes) {
description.minPlaybackRate =
parseFloat(playbackRateNode.attributes['min']);
}
}
return description;
}
/**
* Reads chaining url.
*
* @param {!shaka.extern.xml.Node} mpd
* @return {?string}
* @private
*/
parseMpdChaining_(mpd) {
const TXml = shaka.util.TXml;
const supplementalProperties =
TXml.findChildren(mpd, 'SupplementalProperty');
if (!supplementalProperties.length) {
return null;
}
for (const prop of supplementalProperties) {
const schemeId = prop.attributes['schemeIdUri'];
if (schemeId == 'urn:mpeg:dash:chaining:2016') {
return prop.attributes['value'];
}
}
return null;
}
/**
* 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 {function():!Array.<string>} getBaseUris
* @param {!shaka.extern.xml.Node} mpd
* @param {!boolean} newPeriod
* @return {{
* periods: !Array.<shaka.extern.Period>,
* duration: ?number,
* durationDerivedFromPeriods: boolean
* }}
* @private
*/
parsePeriods_(context, getBaseUris, mpd, newPeriod) {
const TXml = shaka.util.TXml;
let presentationDuration = context.mediaPresentationDuration;
if (!presentationDuration) {
presentationDuration = TXml.parseAttr(
mpd, 'mediaPresentationDuration', TXml.parseDuration);
this.manifestPatchContext_.mediaPresentationDuration =
presentationDuration;
}
let seekRangeStart = 0;
if (this.manifest_ && this.manifest_.presentationTimeline &&
this.isTransitionFromDynamicToStatic_) {
seekRangeStart = this.manifest_.presentationTimeline.getSeekRangeStart();
}
const periods = [];
let prevEnd = seekRangeStart;
const periodNodes = TXml.findChildren(mpd, 'Period');
for (let i = 0; i < periodNodes.length; i++) {
const elem = periodNodes[i];
const next = periodNodes[i + 1];
const start = /** @type {number} */ (
TXml.parseAttr(elem, 'start', TXml.parseDuration, prevEnd));
const periodId = elem.attributes['id'];
const givenDuration =
TXml.parseAttr(elem, 'duration', TXml.parseDuration);
let periodDuration = null;
if (next) {
// "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."
const nextStart =
TXml.parseAttr(next, 'start', TXml.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 + seekRangeStart;
}
const 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);
// This means it's a gap, the distance between period starts is
// larger than the period's duration
if (periodDuration > givenDuration) {
this.gapCount_++;
}
}
// 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;
}
/**
* This is to improve robustness when the player observes manifest with
* past periods that are inconsistent to previous ones.
*
* This may happen when a CDN or proxy server switches its upstream from
* one encoder to another redundant encoder.
*
* Skip periods that match all of the following criteria:
* - Start time is earlier than latest period start time ever seen
* - Period ID is never seen in the previous manifest
* - Not the last period in the manifest
*
* Periods that meet the aforementioned criteria are considered invalid
* and should be safe to discard.
*/
if (this.largestPeriodStartTime_ !== null &&
periodId !== null && start !== null &&
start < this.largestPeriodStartTime_ &&
!this.lastManifestUpdatePeriodIds_.includes(periodId) &&
i + 1 != periodNodes.length) {
shaka.log.debug(
`Skipping Period with ID ${periodId} as its start time is smaller` +
' than the largest period start time that has been seen, and ID ' +
'is unseen before');
continue;
}
// Save maximum period start time if it is the last period
if (start !== null &&
(this.largestPeriodStartTime_ === null ||
start > this.largestPeriodStartTime_)) {
this.largestPeriodStartTime_ = start;
}
// Parse child nodes.
const info = {
start: start,
duration: periodDuration,
node: elem,
isLastPeriod: periodDuration == null || !next,
};
const period = this.parsePeriod_(context, getBaseUris, info);
periods.push(period);
if (context.period.id && periodDuration) {
this.periodDurations_[context.period.id] = periodDuration;
}
if (periodDuration == null) {
if (next) {
// 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.', next);
}
// The duration is unknown, so the end is unknown.
prevEnd = null;
break;
}
prevEnd = start + periodDuration;
} // end of period parsing loop
if (newPeriod) {
// append new period from the patch manifest
for (const el of periods) {
const periodID = el.id;
if (!this.lastManifestUpdatePeriodIds_.includes(periodID)) {
this.lastManifestUpdatePeriodIds_.push(periodID);
}
}
} else {
// Replace previous seen periods with the current one.
this.lastManifestUpdatePeriodIds_ = periods.map((el) => el.id);
}
if (presentationDuration != null) {
if (prevEnd != null) {
const threshold =
shaka.util.ManifestParserUtils.GAP_OVERLAP_TOLERANCE_SECONDS;
const diference = prevEnd - seekRangeStart - presentationDuration;
if (Math.abs(diference) > threshold) {
shaka.log.warning(
'@mediaPresentationDuration does not match the total duration ',
'of all Periods.');
// Assume @mediaPresentationDuration is correct.
}
}
return {
periods: periods,
duration: presentationDuration + seekRangeStart,
durationDerivedFromPeriods: false,
};
} else {
return {
periods: periods,
duration: prevEnd,
durationDerivedFromPeriods: true,
};
}
}
/**
* Clean StreamMap Object to remove reference of deleted Stream Object
* @private
*/
cleanStreamMap_() {
const oldPeriodIds = Object.keys(this.indexStreamMap_);
if (oldPeriodIds.length === this.lastManifestUpdatePeriodIds_.length) {
return;
}
const diffPeriodsIDs = oldPeriodIds.filter((pId) => {
return !this.lastManifestUpdatePeriodIds_.includes(pId);
});
for (const pId of diffPeriodsIDs) {
for (const contextId of this.indexStreamMap_[pId]) {
delete this.streamMap_[contextId];
}
delete this.indexStreamMap_[pId];
}
}
/**
* 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 {function():!Array.<string>} getBaseUris
* @param {shaka.dash.DashParser.PeriodInfo} periodInfo
* @return {shaka.extern.Period}
* @private
*/
parsePeriod_(context, getBaseUris, periodInfo) {
const Functional = shaka.util.Functional;
const TXml = shaka.util.TXml;
const ContentType = shaka.util.ManifestParserUtils.ContentType;
goog.asserts.assert(periodInfo.node, 'periodInfo.node should exist');
context.period = this.createFrame_(periodInfo.node, null, getBaseUris);
context.periodInfo = periodInfo;
context.period.availabilityTimeOffset = context.availabilityTimeOffset;
// 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;
}
const eventStreamNodes =
TXml.findChildren(periodInfo.node, 'EventStream');
const availabilityStart =
context.presentationTimeline.getSegmentAvailabilityStart();
for (const node of eventStreamNodes) {
this.parseEventStream_(
periodInfo.start, periodInfo.duration, node, availabilityStart);
}
const adaptationSetNodes =
TXml.findChildren(periodInfo.node, 'AdaptationSet');
const adaptationSets = adaptationSetNodes
.map((node, position) =>
this.parseAdaptationSet_(context, position, node))
.filter(Functional.isNotNull);
// For dynamic manifests, we use rep IDs internally, and they must be
// unique.
if (context.dynamic) {
const ids = [];
for (const set of adaptationSets) {
for (const id of set.representationIds) {
ids.push(id);
}
}
const uniqueIds = new Set(ids);
if (ids.length != uniqueIds.size) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.DASH_DUPLICATE_REPRESENTATION_ID);
}
}
const normalAdaptationSets = adaptationSets
.filter((as) => { return !as.trickModeFor; });
const trickModeAdaptationSets = adaptationSets
.filter((as) => { return as.trickModeFor; });
// Attach trick mode tracks to normal tracks.
for (const trickModeSet of trickModeAdaptationSets) {
const targetIds = trickModeSet.trickModeFor.split(' ');
for (const normalSet of normalAdaptationSets) {
if (targetIds.includes(normalSet.id)) {
for (const stream of normalSet.streams) {
// There may be multiple trick mode streams, but we do not
// currently support that. Just choose one.
// TODO: https://github.com/shaka-project/shaka-player/issues/1528
stream.trickModeVideo = trickModeSet.streams.find((trickStream) =>
shaka.util.MimeUtils.getNormalizedCodec(stream.codecs) ==
shaka.util.MimeUtils.getNormalizedCodec(trickStream.codecs));
}
}
}
}
const audioStreams = this.getStreamsFromSets_(
this.config_.disableAudio,
normalAdaptationSets,
ContentType.AUDIO);
const videoStreams = this.getStreamsFromSets_(
this.config_.disableVideo,
normalAdaptationSets,
ContentType.VIDEO);
const textStreams = this.getStreamsFromSets_(
this.config_.disableText,
normalAdaptationSets,
ContentType.TEXT);
const imageStreams = this.getStreamsFromSets_(
this.config_.disableThumbnails,
normalAdaptationSets,
ContentType.IMAGE);
if (videoStreams.length === 0 && audioStreams.length === 0) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.DASH_EMPTY_PERIOD,
);
}
return {
id: context.period.id,
audioStreams,
videoStreams,
textStreams,
imageStreams,
};
}
/**
* Gets the streams from the given sets or returns an empty array if disabled
* or no streams are found.
* @param {boolean} disabled
* @param {!Array.<!shaka.dash.DashParser.AdaptationInfo>} adaptationSets
* @param {string} contentType
@private
*/
getStreamsFromSets_(disabled, adaptationSets, contentType) {
if (disabled || !adaptationSets.length) {
return [];
}
return adaptationSets.reduce((all, part) => {
if (part.contentType != contentType) {
return all;
}
all.push(...part.streams);
return all;
}, []);
}
/**
* Parses an AdaptationSet XML element.
*
* @param {shaka.dash.DashParser.Context} context
* @param {number} position
* @param {!shaka.extern.xml.Node} elem The AdaptationSet element.
* @return {?shaka.dash.DashParser.AdaptationInfo}
* @private
*/
parseAdaptationSet_(context, position, elem) {
const TXml = shaka.util.TXml;
const Functional = shaka.util.Functional;
const ManifestParserUtils = shaka.util.ManifestParserUtils;
const ContentType = ManifestParserUtils.ContentType;
const ContentProtection = shaka.dash.ContentProtection;
context.adaptationSet = this.createFrame_(elem, context.period, null);
context.adaptationSet.position = position;
let main = false;
const roleElements = TXml.findChildren(elem, 'Role');
const roleValues = roleElements.map((role) => {
return role.attributes['value'];
}).filter(Functional.isNotNull);
// Default kind for text streams is 'subtitle' if unspecified in the
// manifest.
let kind = undefined;
const isText = context.adaptationSet.contentType == ContentType.TEXT;
if (isText) {
kind = ManifestParserUtils.TextStreamKind.SUBTITLE;
}
for (const roleElement of roleElements) {
const scheme = roleElement.attributes['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
const value = roleElement.attributes['value'];
switch (value) {
case 'main':
main = true;
break;
case 'caption':
case 'subtitle':
kind = value;
break;
}
}
}
// Parallel for HLS VIDEO-RANGE as defined in DASH-IF IOP v4.3 6.2.5.1.
let videoRange;
let colorGamut;
// Ref. https://dashif.org/docs/DASH-IF-IOP-v4.3.pdf
// If signaled, a Supplemental or Essential Property descriptor
// shall be used, with the schemeIdUri set to
// urn:mpeg:mpegB:cicp:<Parameter> as defined in
// ISO/IEC 23001-8 [49] and <Parameter> one of the
// following: ColourPrimaries, TransferCharacteristics,
// or MatrixCoefficients.
const scheme = 'urn:mpeg:mpegB:cicp';
const transferCharacteristicsScheme = `${scheme}:TransferCharacteristics`;
const colourPrimariesScheme = `${scheme}:ColourPrimaries`;
const matrixCoefficientsScheme = `${scheme}:MatrixCoefficients`;
const getVideoRangeFromTransferCharacteristicCICP = (cicp) => {
switch (cicp) {
case 1:
case 6:
case 13:
case 14:
case 15:
return 'SDR';
case 16:
return 'PQ';
case 18:
return 'HLG';
}
return undefined;
};
const getColorGamutFromColourPrimariesCICP = (cicp) => {
switch (cicp) {
case 1:
case 5:
case 6:
case 7:
return 'srgb';
case 9:
return 'rec2020';
case 11:
case 12:
return 'p3';
}
return undefined;
};
const essentialProperties =
TXml.findChildren(elem, 'EssentialProperty');
// ID of real AdaptationSet if this is a trick mode set:
let trickModeFor = null;
let isFastSwitching = false;
let unrecognizedEssentialProperty = false;
for (const prop of essentialProperties) {
const schemeId = prop.attributes['schemeIdUri'];
if (schemeId == 'http://dashif.org/guidelines/trickmode') {
trickModeFor = prop.attributes['value'];
} else if (schemeId == transferCharacteristicsScheme) {
videoRange = getVideoRangeFromTransferCharacteristicCICP(
parseInt(prop.attributes['value'], 10),
);
} else if (schemeId == colourPrimariesScheme) {
colorGamut = getColorGamutFromColourPrimariesCICP(
parseInt(prop.attributes['value'], 10),
);
} else if (schemeId == matrixCoefficientsScheme) {
continue;
} else if (schemeId == 'urn:mpeg:dash:ssr:2023' &&
this.config_.dash.enableFastSwitching) {
isFastSwitching = true;
} else {
unrecognizedEssentialProperty = true;
}
}
let lastSegmentNumber = null;
const supplementalProperties =
TXml.findChildren(elem, 'SupplementalProperty');
for (const prop of supplementalProperties) {
const schemeId = prop.attributes['schemeIdUri'];
if (schemeId == 'http://dashif.org/guidelines/last-segment-number') {
lastSegmentNumber = parseInt(prop.attributes['value'], 10) - 1;
} else if (schemeId == transferCharacteristicsScheme) {
videoRange = getVideoRangeFromTransferCharacteristicCICP(
parseInt(prop.attributes['value'], 10),
);
} else if (schemeId == colourPrimariesScheme) {
colorGamut = getColorGamutFromColourPrimariesCICP(
parseInt(prop.attributes['value'], 10),
);
}
}
const accessibilities = TXml.findChildren(elem, 'Accessibility');
const LanguageUtils = shaka.util.LanguageUtils;
const closedCaptions = new Map();
/** @type {?shaka.media.ManifestParser.AccessibilityPurpose} */
let accessibilityPurpose;
for (const prop of accessibilities) {
const schemeId = prop.attributes['schemeIdUri'];
const value = prop.attributes['value'];
if (schemeId == 'urn:scte:dash:cc:cea-608:2015' &&
!this.config_.disableText) {
let channelId = 1;
if (value != null) {
const channelAssignments = value.split(';');
for (const captionStr of channelAssignments) {
let channel;
let language;
// Some closed caption descriptions have channel number and
// language ("CC1=eng") others may only have language ("eng,spa").
if (!captionStr.includes('=')) {
// When the channel assignemnts are not explicitly provided and
// there are only 2 values provided, it is highly likely that the
// assignments are CC1 and CC3 (most commonly used CC streams).
// Otherwise, cycle through all channels arbitrarily (CC1 - CC4)
// in order of provided langs.
channel = `CC${channelId}`;
if (channelAssignments.length == 2) {
channelId += 2;
} else {
channelId ++;
}
language = captionStr;
} else {
const channelAndLanguage = captionStr.split('=');
// The channel info can be '1' or 'CC1'.
// If the channel info only has channel number(like '1'), add 'CC'
// as prefix so that it can be a full channel id (like 'CC1').
channel = channelAndLanguage[0].startsWith('CC') ?
channelAndLanguage[0] : `CC${channelAndLanguage[0]}`;
// 3 letters (ISO 639-2). In b/187442669, we saw a blank string
// (CC2=;CC3=), so default to "und" (the code for "undetermined").
language = channelAndLanguage[1] || 'und';
}
closedCaptions.set(channel, LanguageUtils.normalize(language));
}
} else {
// If channel and language information has not been provided, assign
// 'CC1' as channel id and 'und' as language info.
closedCaptions.set('CC1', 'und');
}
} else if (schemeId == 'urn:scte:dash:cc:cea-708:2015' &&
!this.config_.disableText) {
let serviceNumber = 1;
if (value != null) {
for (const captionStr of value.split(';')) {
let service;
let language;
// Similar to CEA-608, it is possible that service # assignments
// are not explicitly provided e.g. "eng;deu;swe" In this case,
// we just cycle through the services for each language one by one.
if (!captionStr.includes('=')) {
service = `svc${serviceNumber}`;
serviceNumber ++;
language = captionStr;
} else {
// Otherwise, CEA-708 caption values take the form "
// 1=lang:eng;2=lang:deu" i.e. serviceNumber=lang:threelettercode.
const serviceAndLanguage = captionStr.split('=');
service = `svc${serviceAndLanguage[0]}`;
// The language info can be different formats, lang:eng',
// or 'lang:eng,war:1,er:1'. Extract the language info.
language = serviceAndLanguage[1].split(',')[0].split(':').pop();
}
closedCaptions.set(service, LanguageUtils.normalize(language));
}
} else {
// If service and language information has not been provided, assign
// 'svc1' as service number and 'und' as language info.
closedCaptions.set('svc1', 'und');
}
} else if (schemeId == 'urn:mpeg:dash:role:2011') {
// See DASH IOP 3.9.2 Table 4.
if (value != null) {
roleValues.push(value);
if (value == 'captions') {
kind = ManifestParserUtils.TextStreamKind.CLOSED_CAPTION;
}
}
} else if (schemeId == 'urn:tva:metadata:cs:AudioPurposeCS:2007') {
// See DASH DVB Document A168 Rev.6 Table 5.
if (value == '1') {
accessibilityPurpose =
shaka.media.ManifestParser.AccessibilityPurpose.VISUALLY_IMPAIRED;
} else if (value == '2') {
accessibilityPurpose =
shaka.media.ManifestParser.AccessibilityPurpose.HARD_OF_HEARING;
}
}
}
// 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;
}
const contentProtectionElems =
TXml.findChildren(elem, 'ContentProtection');
const contentProtection = ContentProtection.parseFromAdaptationSet(
contentProtectionElems,
this.config_.dash.ignoreDrmInfo,
this.config_.dash.keySystemsByURI);
const language = shaka.util.LanguageUtils.normalize(
context.adaptationSet.language || 'und');
const label = context.adaptationSet.label;
// Parse Representations into Streams.
const representations = TXml.findChildren(elem, 'Representation');
const streams = representations.map((representation) => {
const parsedRepresentation = this.parseRepresentation_(context,
contentProtection, kind, language, label, main, roleValues,
closedCaptions, representation, accessibilityPurpose,
lastSegmentNumber);
if (parsedRepresentation) {
parsedRepresentation.hdr = parsedRepresentation.hdr || videoRange;
parsedRepresentation.colorGamut =
parsedRepresentation.colorGamut || colorGamut;
parsedRepresentation.fastSwitching = isFastSwitching;
}
return parsedRepresentation;
}).filter((s) => !!s);
if (streams.length == 0) {
const isImage = context.adaptationSet.contentType == ContentType.IMAGE;
// Ignore empty AdaptationSets if ignoreEmptyAdaptationSet is true
// or they are for text/image content.
if (this.config_.dash.ignoreEmptyAdaptationSet || isText || isImage) {
return null;
}
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) {
const mimeType = streams[0].mimeType;
const codecs = streams[0].codecs;
context.adaptationSet.contentType =
shaka.dash.DashParser.guessContentType_(mimeType, codecs);
for (const stream of streams) {
stream.type = context.adaptationSet.contentType;
}
}
const adaptationId = context.adaptationSet.id ||
('__fake__' + this.globalId_++);
for (const stream of streams) {
// 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.
for (const drmInfo of contentProtection.drmInfos) {
drmInfo.keyIds = drmInfo.keyIds && stream.keyIds ?
new Set([...drmInfo.keyIds, ...stream.keyIds]) :
drmInfo.keyIds || stream.keyIds;
}
if (this.config_.dash.enableAudioGroups) {
stream.groupId = adaptationId;
}
}
const repIds = representations
.map((node) => { return node.attributes['id']; })
.filter(shaka.util.Functional.isNotNull);
return {
id: adaptationId,
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 {Map.<string, string>} closedCaptions
* @param {!shaka.extern.xml.Node} node
* @param {?shaka.media.ManifestParser.AccessibilityPurpose}
* accessibilityPurpose
* @param {?number} lastSegmentNumber
*
* @return {?shaka.extern.Stream} The Stream, or null when there is a
* non-critical parsing error.
* @private
*/
parseRepresentation_(context, contentProtection, kind, language, label,
isPrimary, roles, closedCaptions, node, accessibilityPurpose,
lastSegmentNumber) {
const TXml = shaka.util.TXml;
const ContentType = shaka.util.ManifestParserUtils.ContentType;
context.representation =
this.createFrame_(node, context.adaptationSet, null);
const representationId = context.representation.id;
this.minTotalAvailabilityTimeOffset_ =
Math.min(this.minTotalAvailabilityTimeOffset_,
context.representation.availabilityTimeOffset);
this.isLowLatency_ = this.minTotalAvailabilityTimeOffset_ > 0;
if (!this.verifyRepresentation_(context.representation)) {
shaka.log.warning('Skipping Representation', context.representation);
return null;
}
const periodStart = context.periodInfo.start;
// 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/shaka-project/shaka-player/issues/938#issuecomment-317278180
context.bandwidth =
TXml.parseAttr(node, 'bandwidth', TXml.parsePositiveInt) || 0;
context.roles = roles;
/** @type {?shaka.dash.DashParser.StreamInfo} */
let streamInfo;
const contentType = context.representation.contentType;
const isText = contentType == ContentType.TEXT ||
contentType == ContentType.APPLICATION;
const isImage = contentType == ContentType.IMAGE;
try {
/** @type {shaka.extern.aesKey|undefined} */
let aesKey = undefined;
if (contentProtection.aes128Info) {
const getBaseUris = context.representation.getBaseUris;
const uris = shaka.util.ManifestParserUtils.resolveUris(
getBaseUris(), [contentProtection.aes128Info.keyUri]);
const requestType = shaka.net.NetworkingEngine.RequestType.KEY;
const request = shaka.net.NetworkingEngine.makeRequest(
uris, this.config_.retryParameters);
aesKey = {
bitsKey: 128,
blockCipherMode: 'CBC',
iv: contentProtection.aes128Info.iv,
firstMediaSequenceNumber: 0,
};
// Don't download the key object until the segment is parsed, to
// avoid a startup delay for long manifests with lots of keys.
aesKey.fetchKey = async () => {
const keyResponse =
await this.makeNetworkRequest_(request, requestType);
// keyResponse.status is undefined when URI is
// "data:text/plain;base64,"
if (!keyResponse.data || keyResponse.data.byteLength != 16) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.AES_128_INVALID_KEY_LENGTH);
}
const algorithm = {
name: 'AES-CBC',
};
aesKey.cryptoKey = await window.crypto.subtle.importKey(
'raw', keyResponse.data, algorithm, true, ['decrypt']);
aesKey.fetchKey = undefined; // No longer needed.
};
}
context.representation.aesKey = aesKey;
const requestSegment = (uris, startByte, endByte, isInit) => {
return this.requestSegment_(uris, startByte, endByte, isInit);
};
if (context.representation.segmentBase) {
streamInfo = shaka.dash.SegmentBase.createStreamInfo(
context, requestSegment, aesKey);
} else if (context.representation.segmentList) {
streamInfo = shaka.dash.SegmentList.createStreamInfo(
context, this.streamMap_, aesKey);
} else if (context.representation.segmentTemplate) {
const hasManifest = !!this.manifest_;
streamInfo = shaka.dash.SegmentTemplate.createStreamInfo(
context, requestSegment, this.streamMap_, hasManifest,
this.config_.dash.initialSegmentLimit, this.periodDurations_,
aesKey, lastSegmentNumber, /* isPatchUpdate= */ false);
} else {
goog.asserts.assert(isText,
'Must have Segment* with non-text streams.');
const duration = context.periodInfo.duration || 0;
const getBaseUris = context.representation.getBaseUris;
const mimeType = context.representation.mimeType;
const codecs = context.representation.codecs;
streamInfo = {
generateSegmentIndex: () => {
const segmentIndex = shaka.media.SegmentIndex.forSingleSegment(
periodStart, duration, getBaseUris());
segmentIndex.forEachTopLevelReference((ref) => {
ref.mimeType = mimeType;
ref.codecs = codecs;
});
return Promise.resolve(segmentIndex);
},
};
}
} catch (error) {
if ((isText || isImage) &&
error.code == shaka.util.Error.Code.DASH_NO_SEGMENT_INFO) {
// We will ignore any DASH_NO_SEGMENT_INFO errors for text/image
// streams.
return null;
}
// For anything else, re-throw.
throw error;
}
const contentProtectionElems =
TXml.findChildren(node, 'ContentProtection');
const keyId = shaka.dash.ContentProtection.parseFromRepresentation(
contentProtectionElems, contentProtection,
this.config_.dash.ignoreDrmInfo,
this.config_.dash.keySystemsByURI);
const keyIds = new Set(keyId ? [keyId] : []);
// Detect the presence of E-AC3 JOC audio content, using DD+JOC signaling.
// See: ETSI TS 103 420 V1.2.1 (2018-10)
const supplementalPropertyElems =
TXml.findChildren(node, 'SupplementalProperty');
const hasJoc = supplementalPropertyElems.some((element) => {
const expectedUri = 'tag:dolby.com,2018:dash:EC3_ExtensionType:2018';
const expectedValue = 'JOC';
return element.attributes['schemeIdUri'] == expectedUri &&
element.attributes['value'] == expectedValue;
});
let spatialAudio = false;
if (hasJoc) {
spatialAudio = true;
}
let forced = false;
if (isText) {
// See: https://github.com/shaka-project/shaka-player/issues/2122 and
// https://github.com/Dash-Industry-Forum/DASH-IF-IOP/issues/165
forced = roles.includes('forced_subtitle') ||
roles.includes('forced-subtitle');
}
let tilesLayout;
if (isImage) {
const essentialPropertyElems =
TXml.findChildren(node, 'EssentialProperty');
const thumbnailTileElem = essentialPropertyElems.find((element) => {
const expectedUris = [
'http://dashif.org/thumbnail_tile',
'http://dashif.org/guidelines/thumbnail_tile',
];
return expectedUris.includes(element.attributes['schemeIdUri']);
});
if (thumbnailTileElem) {
tilesLayout = thumbnailTileElem.attributes['value'];
}
// Filter image adaptation sets that has no tilesLayout.
if (!tilesLayout) {
return null;
}
}
let hdr;
const profiles = context.profiles;
const codecs = context.representation.codecs;
const hevcHDR = 'http://dashif.org/guidelines/dash-if-uhd#hevc-hdr-pq10';
if (profiles.includes(hevcHDR) && (codecs.includes('hvc1.2.4.L153.B0') ||
codecs.includes('hev1.2.4.L153.B0'))) {
hdr = 'PQ';
}
const contextId = context.representation.id ?
context.period.id + ',' + context.representation.id : '';
if (this.patchLocationNodes_.length && representationId) {
this.contextCache_.set(`${context.period.id},${representationId}`,
this.cloneContext_(context));
}
/** @type {shaka.extern.Stream} */
let stream;
if (contextId && this.streamMap_[contextId]) {
stream = this.streamMap_[contextId];
} else {
stream = {
id: this.globalId_++,
originalId: context.representation.id,
groupId: null,
createSegmentIndex: () => Promise.resolve(),
closeSegmentIndex: () => {
if (stream.segmentIndex) {
stream.segmentIndex.release();
stream.segmentIndex = null;
}
},
segmentIndex: null,
mimeType: context.representation.mimeType,
codecs,
frameRate: context.representation.frameRate,
pixelAspectRatio: context.representation.pixelAspectRatio,
bandwidth: context.bandwidth,
width: context.representation.width,
height: context.representation.height,
kind,
encrypted: contentProtection.drmInfos.length > 0,
drmInfos: contentProtection.drmInfos,
keyIds,
language,
originalLanguage: context.adaptationSet.language,
label,
type: context.adaptationSet.contentType,
primary: isPrimary,
trickModeVideo: null,
emsgSchemeIdUris:
context.representation.emsgSchemeIdUris,
roles,
forced,
channelsCount: context.representation.numChannels,
audioSamplingRate: context.representation.audioSamplingRate,
spatialAudio,
closedCaptions,
hdr,
colorGamut: undefined,
videoLayout: undefined,
tilesLayout,
accessibilityPurpose,
external: false,
fastSwitching: false,
fullMimeTypes: new Set([shaka.util.MimeUtils.getFullType(
context.representation.mimeType, context.representation.codecs)]),
};
}
stream.createSegmentIndex = async () => {
if (!stream.segmentIndex) {
stream.segmentIndex = await streamInfo.generateSegmentIndex();
}
};
if (contextId && context.dynamic && !this.streamMap_[contextId]) {
const periodId = context.period.id || '';
if (!this.indexStreamMap_[periodId]) {
this.indexStreamMap_[periodId] = [];
}
this.streamMap_[contextId] = stream;
this.indexStreamMap_[periodId].push(contextId);
}
return stream;
}
/**
* Clone context and remove xml document references.
*
* @param {!shaka.dash.DashParser.Context} context
* @return {!shaka.dash.DashParser.Context}
* @private
*/
cloneContext_(context) {
/**
* @param {?shaka.dash.DashParser.InheritanceFrame} frame
* @return {?shaka.dash.DashParser.InheritanceFrame}
*/
const cloneFrame = (frame) => {
if (!frame) {
return null;
}
const clone = shaka.util.ObjectUtils.shallowCloneObject(frame);
clone.segmentBase = null;
clone.segmentList = null;
clone.segmentTemplate = shaka.util.TXml.cloneNode(clone.segmentTemplate);
return clone;
};
const contextClone = shaka.util.ObjectUtils.shallowCloneObject(context);
contextClone.period = cloneFrame(contextClone.period);
contextClone.adaptationSet = cloneFrame(contextClone.adaptationSet);
contextClone.representation = cloneFrame(contextClone.representation);
if (contextClone.periodInfo) {
contextClone.periodInfo =
shaka.util.ObjectUtils.shallowCloneObject(contextClone.periodInfo);
contextClone.periodInfo.node = null;
}
return contextClone;
}
/**
* Called when the update timer ticks.
*
* @return {!Promise}
* @private
*/
async onUpdate_() {
goog.asserts.assert(this.updatePeriod_ >= 0,
'There should be an update period');
shaka.log.info('Updating manifest...');
// Default the update delay to 0 seconds so that if there is an error we can
// try again right away.
let updateDelay = 0;
try {
updateDelay = await this.requestManifest_();
} catch (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_) {
if (this.config_.raiseFatalErrorOnManifestUpdateRequestFailure) {
this.playerInterface_.onError(error);
return;
}
// We will retry updating, so override the severity of the error.
error.severity = shaka.util.Error.Severity.RECOVERABLE;
this.playerInterface_.onError(error);
}
}
// Detect a call to stop()
if (!this.playerInterface_) {
return;
}
this.playerInterface_.onManifestUpdated();
this.setUpdateTimer_(updateDelay);
}
/**
* Update now the manifest
*
* @private
*/
updateNow_() {
this.updateTimer_.tickNow();
}
/**
* 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
*/
setUpdateTimer_(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/Dash-Industry-Forum/Guidelines-TimingModel/issues/48
if (this.updatePeriod_ < 0) {
return;
}
let updateTime = this.updatePeriod_;
if (this.config_.dash.updatePeriod >= 0) {
updateTime = this.config_.dash.updatePeriod;
}
const finalDelay = Math.max(
updateTime - offset,
this.averageUpdateDuration_.getEstimate());
// We do not run the timer as repeating because part of update is async and
// we need schedule the update after it finished.
this.updateTimer_.tickAfter(/* seconds= */ finalDelay);
}
/**
* Creates a new inheritance frame for the given element.
*
* @param {!shaka.extern.xml.Node} elem
* @param {?shaka.dash.DashParser.InheritanceFrame} parent
* @param {?function():!Array.<string>} getBaseUris
* @return {shaka.dash.DashParser.InheritanceFrame}
* @private
*/
createFrame_(elem, parent, getBaseUris) {
goog.asserts.assert(parent || getBaseUris,
'Must provide either parent or getBaseUris');
const SCTE214 = shaka.dash.DashParser.SCTE214_;
const SegmentUtils = shaka.media.SegmentUtils;
const ManifestParserUtils = shaka.util.ManifestParserUtils;
const TXml = shaka.util.TXml;
parent = parent || /** @type {shaka.dash.DashParser.InheritanceFrame} */ ({
contentType: '',
mimeType: '',
codecs: '',
emsgSchemeIdUris: [],
frameRate: undefined,
pixelAspectRatio: undefined,
numChannels: null,
audioSamplingRate: null,
availabilityTimeOffset: 0,
segmentSequenceCadence: 0,
});
getBaseUris = getBaseUris || parent.getBaseUris;
const parseNumber = TXml.parseNonNegativeInt;
const evalDivision = TXml.evalDivision;
const id = elem.attributes['id'];
const uriObjs = TXml.findChildren(elem, 'BaseURL');
let calculatedBaseUris;
let someLocationValid = false;
if (this.contentSteeringManager_) {
for (const uriObj of uriObjs) {
const serviceLocation = uriObj.attributes['serviceLocation'];
const uri = TXml.getContents(uriObj);
if (serviceLocation && uri) {
this.contentSteeringManager_.addLocation(
id, serviceLocation, uri);
someLocationValid = true;
}
}
}
if (!someLocationValid || !this.contentSteeringManager_) {
calculatedBaseUris = uriObjs.map(TXml.getContents);
}
const getFrameUris = () => {
if (!uriObjs.length) {
return [];
}
if (this.contentSteeringManager_ && someLocationValid) {
return this.contentSteeringManager_.getLocations(id);
}
if (calculatedBaseUris) {
return calculatedBaseUris;
}
return [];
};
let contentType = elem.attributes['contentType'] || parent.contentType;
const mimeType = elem.attributes['mimeType'] || parent.mimeType;
const allCodecs = [
elem.attributes['codecs'] || parent.codecs,
];
const supplementalCodecs =
TXml.getAttributeNS(elem, SCTE214, 'supplementalCodecs');
if (supplementalCodecs) {
allCodecs.push(supplementalCodecs);
}
const codecs = SegmentUtils.codecsFiltering(allCodecs).join(',');
const frameRate =
TXml.parseAttr(elem, 'frameRate', evalDivision) || parent.frameRate;
const pixelAspectRatio =
elem.attributes['sar'] || parent.pixelAspectRatio;
const emsgSchemeIdUris = this.emsgSchemeIdUris_(
TXml.findChildren(elem, 'InbandEventStream'),
parent.emsgSchemeIdUris);
const audioChannelConfigs =
TXml.findChildren(elem, 'AudioChannelConfiguration');
const numChannels =
this.parseAudioChannels_(audioChannelConfigs) || parent.numChannels;
const audioSamplingRate =
TXml.parseAttr(elem, 'audioSamplingRate', parseNumber) ||
parent.audioSamplingRate;
if (!contentType) {
contentType = shaka.dash.DashParser.guessContentType_(mimeType, codecs);
}
const segmentBase = TXml.findChild(elem, 'SegmentBase');
const segmentTemplate = TXml.findChild(elem, 'SegmentTemplate');
// The availabilityTimeOffset is the sum of all @availabilityTimeOffset
// values that apply to the adaptation set, via BaseURL, SegmentBase,
// or SegmentTemplate elements.
const segmentBaseAto = segmentBase ?
(TXml.parseAttr(segmentBase, 'availabilityTimeOffset',
TXml.parseFloat) || 0) : 0;
const segmentTemplateAto = segmentTemplate ?
(TXml.parseAttr(segmentTemplate, 'availabilityTimeOffset',
TXml.parseFloat) || 0) : 0;
const baseUriAto = uriObjs && uriObjs.length ?
(TXml.parseAttr(uriObjs[0], 'availabilityTimeOffset',
TXml.parseFloat) || 0) : 0;
const availabilityTimeOffset = parent.availabilityTimeOffset + baseUriAto +
segmentBaseAto + segmentTemplateAto;
let segmentSequenceCadence = null;
const segmentSequenceProperties =
TXml.findChild(elem, 'SegmentSequenceProperties');
if (segmentSequenceProperties) {
const sap = TXml.findChild(segmentSequenceProperties, 'SAP');
if (sap) {
segmentSequenceCadence = TXml.parseAttr(sap, 'cadence',
TXml.parseInt);
}
}
// This attribute is currently non-standard, but it is supported by Kaltura.
let label = elem.attributes['label'];
// See DASH IOP 4.3 here https://dashif.org/docs/DASH-IF-IOP-v4.3.pdf (page 35)
const labelElements = TXml.findChildren(elem, 'Label');
if (labelElements && labelElements.length) {
// NOTE: Right now only one label field is supported.
const firstLabelElement = labelElements[0];
if (TXml.getTextContents(firstLabelElement)) {
label = TXml.getTextContents(firstLabelElement);
}
}
return {
getBaseUris:
() => ManifestParserUtils.resolveUris(getBaseUris(), getFrameUris()),
segmentBase: segmentBase || parent.segmentBase,
segmentList:
TXml.findChild(elem, 'SegmentList') || parent.segmentList,
segmentTemplate: segmentTemplate || parent.segmentTemplate,
width: TXml.parseAttr(elem, 'width', parseNumber) || parent.width,
height: TXml.parseAttr(elem, 'height', parseNumber) || parent.height,
contentType: contentType,
mimeType: mimeType,
codecs: codecs,
frameRate: frameRate,
pixelAspectRatio: pixelAspectRatio,
emsgSchemeIdUris: emsgSchemeIdUris,
id: id,
language: elem.attributes['lang'],
numChannels: numChannels,
audioSamplingRate: audioSamplingRate,
availabilityTimeOffset: availabilityTimeOffset,
initialization: null,
segmentSequenceCadence:
segmentSequenceCadence || parent.segmentSequenceCadence,
label: label || null,
};
}
/**
* Returns a new array of InbandEventStream schemeIdUri containing the union
* of the ones parsed from inBandEventStreams and the ones provided in
* emsgSchemeIdUris.
*
* @param {!Array.<!shaka.extern.xml.Node>} inBandEventStreams
* Array of InbandEventStream
* elements to parse and add to the returned array.
* @param {!Array.<string>} emsgSchemeIdUris Array of parsed
* InbandEventStream schemeIdUri attributes to add to the returned array.
* @return {!Array.<string>} schemeIdUris Array of parsed
* InbandEventStream schemeIdUri attributes.
* @private
*/
emsgSchemeIdUris_(inBandEventStreams, emsgSchemeIdUris) {
const schemeIdUris = emsgSchemeIdUris.slice();
for (const event of inBandEventStreams) {
const schemeIdUri = event.attributes['schemeIdUri'];
if (!schemeIdUris.includes(schemeIdUri)) {
schemeIdUris.push(schemeIdUri);
}
}
return schemeIdUris;
}
/**
* @param {!Array.<!shaka.extern.xml.Node>} audioChannelConfigs An array of
* AudioChannelConfiguration elements.
* @return {?number} The number of audio channels, or null if unknown.
* @private
*/
parseAudioChannels_(audioChannelConfigs) {
for (const elem of audioChannelConfigs) {
const scheme = elem.attributes['schemeIdUri'];
if (!scheme) {
continue;
}
const value = elem.attributes['value'];
if (!value) {
continue;
}
switch (scheme) {
case 'urn:mpeg:dash:outputChannelPositionList:2012':
// A space-separated list of speaker positions, so the number of
// 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.
const 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.
let 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.
let numBits = 0;
while (hexValue) {
if (hexValue & 1) {
++numBits;
}
hexValue >>= 1;
}
return numBits;
}
// Defined by https://dashif.org/identifiers/audio_source_metadata/ and clause 8.2, in ISO/IEC 23001-8.
case 'urn:mpeg:mpegB:cicp:ChannelConfiguration': {
const noValue = 0;
const channelCountMapping = [
noValue, 1, 2, 3, 4, 5, 6, 8, 2, 3, /* 0--9 */
4, 7, 8, 24, 8, 12, 10, 12, 14, 12, /* 10--19 */
14, /* 20 */
];
const intValue = parseInt(value, 10);
if (!intValue) { // 0 or NaN
shaka.log.warning('Channel parsing failure! ' +
'Ignoring scheme and value', scheme, value);
continue;
}
if (intValue > noValue && intValue < channelCountMapping.length) {
return channelCountMapping[intValue];
}
continue;
}
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
*/
verifyRepresentation_(frame) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
let 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 {function():!Array.<string>} getBaseUris
* @param {string} uri
* @param {string} method
* @return {!Promise.<number>}
* @private
*/
async requestForTiming_(getBaseUris, uri, method) {
const uris = [shaka.util.StringUtils.htmlUnescape(uri)];
const requestUris =
shaka.util.ManifestParserUtils.resolveUris(getBaseUris(), uris);
const request = shaka.net.NetworkingEngine.makeRequest(
requestUris, this.config_.retryParameters);
request.method = method;
const type = shaka.net.NetworkingEngine.RequestType.TIMING;
const operation =
this.playerInterface_.networkingEngine.request(type, request);
this.operationManager_.manage(operation);
const response = await operation.promise;
let text;
if (method == 'HEAD') {
if (!response.headers || !response.headers['date']) {
shaka.log.warning('UTC timing response is missing',
'expected date header');
return 0;
}
text = response.headers['date'];
} else {
text = shaka.util.StringUtils.fromUTF8(response.data);
}
const date = Date.parse(text);
if (isNaN(date)) {
shaka.log.warning('Unable to parse date from UTC timing response');
return 0;
}
return (date - Date.now());
}
/**
* Parses an array of UTCTiming elements.
*
* @param {function():!Array.<string>} getBaseUris
* @param {!Array.<!shaka.extern.xml.Node>} elems
* @return {!Promise.<number>}
* @private
*/
async parseUtcTiming_(getBaseUris, elems) {
const schemesAndValues = elems.map((elem) => {
return {
scheme: elem.attributes['schemeIdUri'],
value: elem.attributes['value'],
};
});
// If there's nothing specified in the manifest, but we have a default from
// the config, use that.
const clockSyncUri = this.config_.dash.clockSyncUri;
if (!schemesAndValues.length && clockSyncUri) {
schemesAndValues.push({
scheme: 'urn:mpeg:dash:utc:http-head:2014',
value: clockSyncUri,
});
}
for (const sv of schemesAndValues) {
try {
const scheme = sv.scheme;
const value = sv.value;
switch (scheme) {
// See DASH IOP Guidelines Section 4.7
// https://bit.ly/DashIop3-2
// Some old ISO23009-1 drafts used 2012.
case 'urn:mpeg:dash:utc:http-head:2014':
case 'urn:mpeg:dash:utc:http-head:2012':
// eslint-disable-next-line no-await-in-loop
return await this.requestForTiming_(getBaseUris, 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':
// eslint-disable-next-line no-await-in-loop
return await this.requestForTiming_(getBaseUris, value, 'GET');
case 'urn:mpeg:dash:utc:direct:2014':
case 'urn:mpeg:dash:utc:direct:2012': {
const 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.alwaysWarn('NTP UTCTiming scheme is not supported');
break;
default:
shaka.log.alwaysWarn(
'Unrecognized scheme in UTCTiming element', scheme);
break;
}
} catch (e) {
shaka.log.warning('Error fetching time from UTCTiming elem', e.message);
}
}
shaka.log.alwaysWarn(
'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 {!shaka.extern.xml.Node} elem
* @param {number} availabilityStart
* @private
*/
parseEventStream_(periodStart, periodDuration, elem, availabilityStart) {
const TXml = shaka.util.TXml;
const parseNumber = shaka.util.TXml.parseNonNegativeInt;
const schemeIdUri = elem.attributes['schemeIdUri'] || '';
const value = elem.attributes['value'] || '';
const timescale = TXml.parseAttr(elem, 'timescale', parseNumber) || 1;
for (const eventNode of TXml.findChildren(elem, 'Event')) {
const presentationTime =
TXml.parseAttr(eventNode, 'presentationTime', parseNumber) || 0;
const duration =
TXml.parseAttr(eventNode, 'duration', parseNumber) || 0;
let startTime = presentationTime / timescale + periodStart;
let 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);
}
// Don't add unavailable regions to the timeline.
if (endTime < availabilityStart) {
continue;
}
/** @type {shaka.extern.TimelineRegionInfo} */
const region = {
schemeIdUri: schemeIdUri,
value: value,
startTime: startTime,
endTime: endTime,
id: eventNode.attributes['id'] || '',
eventElement: TXml.txmlNodeToDomElement(eventNode),
eventNode: eventNode,
};
this.playerInterface_.onTimelineRegionAdded(region);
}
}
/**
* Makes a network request on behalf of SegmentBase.createStreamInfo.
*
* @param {!Array.<string>} uris
* @param {?number} startByte
* @param {?number} endByte
* @param {boolean} isInit
* @return {!Promise.<BufferSource>}
* @private
*/
async requestSegment_(uris, startByte, endByte, isInit) {
const requestType = shaka.net.NetworkingEngine.RequestType.SEGMENT;
const type = isInit ?
shaka.net.NetworkingEngine.AdvancedRequestType.INIT_SEGMENT :
shaka.net.NetworkingEngine.AdvancedRequestType.MEDIA_SEGMENT;
const request = shaka.util.Networking.createSegmentRequest(
uris,
startByte,
endByte,
this.config_.retryParameters);
const response = await this.makeNetworkRequest_(
request, requestType, {type});
return response.data;
}
/**
* Guess the content type based on MIME type and codecs.
*
* @param {string} mimeType
* @param {string} codecs
* @return {string}
* @private
*/
static guessContentType_(mimeType, codecs) {
const 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];
}
/**
* Create a networking request. This will manage the request using the
* parser's operation manager.
*
* @param {shaka.extern.Request} request
* @param {shaka.net.NetworkingEngine.RequestType} type
* @param {shaka.extern.RequestContext=} context
* @return {!Promise.<shaka.extern.Response>}
* @private
*/
makeNetworkRequest_(request, type, context) {
const op = this.playerInterface_.networkingEngine.request(
type, request, context);
this.operationManager_.manage(op);
return op.promise;
}
/**
* @param {!shaka.extern.xml.Node} patchNode
* @private
*/
updatePatchLocationNodes_(patchNode) {
const TXml = shaka.util.TXml;
TXml.modifyNodes(this.patchLocationNodes_, patchNode);
}
/**
* @return {!Array<string>}
* @private
*/
getPatchLocationUris_() {
const TXml = shaka.util.TXml;
const mpdId = this.manifestPatchContext_.mpdId;
const publishTime = this.manifestPatchContext_.publishTime;
if (!mpdId || !publishTime || !this.patchLocationNodes_.length) {
return [];
}
const now = Date.now() / 1000;
const patchLocations = this.patchLocationNodes_.filter((patchLocation) => {
const ttl = TXml.parseNonNegativeInt(patchLocation.attributes['ttl']);
return !ttl || publishTime + ttl > now;
})
.map(TXml.getContents)
.filter(shaka.util.Functional.isNotNull);
if (!patchLocations.length) {
return [];
}
return shaka.util.ManifestParserUtils.resolveUris(
this.manifestUris_, patchLocations);
}
};
/**
* @typedef {{
* mpdId: string,
* type: string,
* mediaPresentationDuration: ?number,
* profiles: !Array.<string>,
* availabilityTimeOffset: number,
* getBaseUris: ?function():!Array.<string>,
* publishTime: number
* }}
*
* @property {string} mpdId
* ID of the original MPD file.
* @property {string} type
* Specifies the type of the dash manifest i.e. "static"
* @property {?number} mediaPresentationDuration
* Media presentation duration, or null if unknown.
* @property {!Array.<string>} profiles
* Profiles of DASH are defined to enable interoperability and the
* signaling of the use of features.
* @property {number} availabilityTimeOffset
* Specifies the total availabilityTimeOffset of the segment.
* @property {?function():!Array.<string>} getBaseUris
* An array of absolute base URIs.
* @property {number} publishTime
* Time when manifest has been published, in seconds.
*/
shaka.dash.DashParser.PatchContext;
/**
* @const {string}
* @private
*/
shaka.dash.DashParser.SCTE214_ = 'urn:scte:dash:scte214-extensions';
/**
* @typedef {
* function(!Array.<string>, ?number, ?number, boolean):
* !Promise.<BufferSource>
* }
*/
shaka.dash.DashParser.RequestSegmentCallback;
/**
* @typedef {{
* segmentBase: ?shaka.extern.xml.Node,
* segmentList: ?shaka.extern.xml.Node,
* segmentTemplate: ?shaka.extern.xml.Node,
* getBaseUris: function():!Array.<string>,
* width: (number|undefined),
* height: (number|undefined),
* contentType: string,
* mimeType: string,
* codecs: string,
* frameRate: (number|undefined),
* pixelAspectRatio: (string|undefined),
* emsgSchemeIdUris: !Array.<string>,
* id: ?string,
* position: (number|undefined),
* language: ?string,
* numChannels: ?number,
* audioSamplingRate: ?number,
* availabilityTimeOffset: number,
* initialization: ?string,
* aesKey: (shaka.extern.aesKey|undefined),
* segmentSequenceCadence: number,
* label: ?string
* }}
*
* @description
* A collection of elements and properties which are inherited across levels
* of a DASH manifest.
*
* @property {?shaka.extern.xml.Node} segmentBase
* The XML node for SegmentBase.
* @property {?shaka.extern.xml.Node} segmentList
* The XML node for SegmentList.
* @property {?shaka.extern.xml.Node} segmentTemplate
* The XML node for SegmentTemplate.
* @property {function():!Array.<string>} getBaseUris
* Function than returns an array of absolute base URIs for the frame.
* @property {(number|undefined)} width
* The inherited width value.
* @property {(number|undefined)} height
* The inherited height value.
* @property {string} contentType
* The inherited media type.
* @property {string} mimeType
* The inherited MIME type value.
* @property {string} codecs
* The inherited codecs value.
* @property {(number|undefined)} frameRate
* The inherited framerate value.
* @property {(string|undefined)} pixelAspectRatio
* The inherited pixel aspect ratio value.
* @property {!Array.<string>} emsgSchemeIdUris
* emsg registered schemeIdUris.
* @property {?string} id
* The ID of the element.
* @property {number|undefined} position
* Position of the element used for indexing in case of no id
* @property {?string} language
* The original language of the element.
* @property {?number} numChannels
* The number of audio channels, or null if unknown.
* @property {?number} audioSamplingRate
* Specifies the maximum sampling rate of the content, or null if unknown.
* @property {number} availabilityTimeOffset
* Specifies the total availabilityTimeOffset of the segment, or 0 if unknown.
* @property {?string} initialization
* Specifies the file where the init segment is located, or null.
* @property {(shaka.extern.aesKey|undefined)} aesKey
* AES-128 Content protection key
* @property {number} segmentSequenceCadence
* Specifies the cadence of independent segments in Segment Sequence
* Representation.
* @property {?string} label
* Label or null if unknown.
*/
shaka.dash.DashParser.InheritanceFrame;
/**
* @typedef {{
* dynamic: boolean,
* presentationTimeline: !shaka.media.PresentationTimeline,
* period: ?shaka.dash.DashParser.InheritanceFrame,
* periodInfo: ?shaka.dash.DashParser.PeriodInfo,
* adaptationSet: ?shaka.dash.DashParser.InheritanceFrame,
* representation: ?shaka.dash.DashParser.InheritanceFrame,
* bandwidth: number,
* indexRangeWarningGiven: boolean,
* availabilityTimeOffset: number,
* mediaPresentationDuration: ?number,
* profiles: !Array.<string>,
* roles: ?Array.<string>
* }}
*
* @description
* Contains context data for the streams. This is designed to be
* shallow-copyable, so the parser must overwrite (not modify) each key as the
* parser moves through the manifest and the parsing context changes.
*
* @property {boolean} dynamic
* True if the MPD is dynamic (not all segments available at once)
* @property {!shaka.media.PresentationTimeline} presentationTimeline
* The PresentationTimeline.
* @property {?shaka.dash.DashParser.InheritanceFrame} period
* The inheritance from the Period element.
* @property {?shaka.dash.DashParser.PeriodInfo} periodInfo
* The Period info for the current Period.
* @property {?shaka.dash.DashParser.InheritanceFrame} adaptationSet
* The inheritance from the AdaptationSet element.
* @property {?shaka.dash.DashParser.InheritanceFrame} representation
* The inheritance from the Representation element.
* @property {number} bandwidth
* The bandwidth of the Representation, or zero if missing.
* @property {boolean} indexRangeWarningGiven
* True if the warning about SegmentURL@indexRange has been printed.
* @property {number} availabilityTimeOffset
* The sum of the availabilityTimeOffset values that apply to the element.
* @property {!Array.<string>} profiles
* Profiles of DASH are defined to enable interoperability and the signaling
* of the use of features.
* @property {?number} mediaPresentationDuration
* Media presentation duration, or null if unknown.
*/
shaka.dash.DashParser.Context;
/**
* @typedef {{
* start: number,
* duration: ?number,
* node: ?shaka.extern.xml.Node,
* isLastPeriod: boolean
* }}
*
* @description
* Contains information about a Period element.
*
* @property {number} start
* The start time of the period.
* @property {?number} duration
* The duration of the period; or null if the duration is not given. This
* will be non-null for all periods except the last.
* @property {?shaka.extern.xml.Node} node
* The XML Node for the Period.
* @property {boolean} isLastPeriod
* Whether this Period is the last one in the manifest.
*/
shaka.dash.DashParser.PeriodInfo;
/**
* @typedef {{
* id: string,
* contentType: ?string,
* language: string,
* main: boolean,
* streams: !Array.<shaka.extern.Stream>,
* drmInfos: !Array.<shaka.extern.DrmInfo>,
* trickModeFor: ?string,
* representationIds: !Array.<string>
* }}
*
* @description
* Contains information about an AdaptationSet element.
*
* @property {string} id
* The unique ID of the adaptation set.
* @property {?string} contentType
* The content type of the AdaptationSet.
* @property {string} language
* The language of the AdaptationSet.
* @property {boolean} main
* Whether the AdaptationSet has the 'main' type.
* @property {!Array.<shaka.extern.Stream>} streams
* The streams this AdaptationSet contains.
* @property {!Array.<shaka.extern.DrmInfo>} drmInfos
* The DRM info for the AdaptationSet.
* @property {?string} trickModeFor
* If non-null, this AdaptationInfo represents trick mode tracks. This
* property is the ID of the normal AdaptationSet these tracks should be
* associated with.
* @property {!Array.<string>} representationIds
* An array of the IDs of the Representations this AdaptationSet contains.
*/
shaka.dash.DashParser.AdaptationInfo;
/**
* @typedef {function():!Promise.<shaka.media.SegmentIndex>}
* @description
* An async function which generates and returns a SegmentIndex.
*/
shaka.dash.DashParser.GenerateSegmentIndexFunction;
/**
* @typedef {{
* generateSegmentIndex: shaka.dash.DashParser.GenerateSegmentIndexFunction
* }}
*
* @description
* Contains information about a Stream. This is passed from the createStreamInfo
* methods.
*
* @property {shaka.dash.DashParser.GenerateSegmentIndexFunction}
* generateSegmentIndex
* An async function to create the SegmentIndex for the stream.
*/
shaka.dash.DashParser.StreamInfo;
shaka.media.ManifestParser.registerParserByMime(
'application/dash+xml', () => new shaka.dash.DashParser());
shaka.media.ManifestParser.registerParserByMime(
'video/vnd.mpeg.dash.mpd', () => new shaka.dash.DashParser());