Source: lib/hls/hls_parser.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2016 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  8. goog.provide('shaka.hls.HlsParser');
  10. goog.require('goog.Uri');
  11. goog.require('goog.asserts');
  12. goog.require('shaka.abr.Ewma');
  13. goog.require('shaka.hls.ManifestTextParser');
  14. goog.require('shaka.hls.Playlist');
  15. goog.require('shaka.hls.PlaylistType');
  16. goog.require('shaka.hls.Tag');
  17. goog.require('shaka.hls.Utils');
  18. goog.require('shaka.log');
  19. goog.require('shaka.media.InitSegmentReference');
  20. goog.require('shaka.media.ManifestParser');
  21. goog.require('shaka.media.PresentationTimeline');
  22. goog.require('shaka.media.SegmentIndex');
  23. goog.require('shaka.media.SegmentReference');
  24. goog.require('shaka.net.DataUriPlugin');
  25. goog.require('shaka.net.NetworkingEngine');
  26. goog.require('shaka.util.ArrayUtils');
  27. goog.require('shaka.util.BufferUtils');
  28. goog.require('shaka.util.DrmUtils');
  29. goog.require('shaka.util.ContentSteeringManager');
  30. goog.require('shaka.util.Error');
  31. goog.require('shaka.util.FakeEvent');
  32. goog.require('shaka.util.LanguageUtils');
  33. goog.require('shaka.util.ManifestParserUtils');
  34. goog.require('shaka.util.MimeUtils');
  35. goog.require('shaka.util.Networking');
  36. goog.require('shaka.util.OperationManager');
  37. goog.require('shaka.util.Pssh');
  38. goog.require('shaka.media.SegmentUtils');
  39. goog.require('shaka.util.Timer');
  40. goog.require('shaka.util.TXml');
  41. goog.require('shaka.util.Platform');
  42. goog.require('shaka.util.Uint8ArrayUtils');
  43. goog.requireType('shaka.hls.Segment');
  46. /**
  47.  * HLS parser.
  48.  *
  49.  * @implements {shaka.extern.ManifestParser}
  50.  * @export
  51.  */
  52. shaka.hls.HlsParser = class {
  53.   /**
  54.    * Creates an Hls Parser object.
  55.    */
  56.   constructor() {
  57.     /** @private {?shaka.extern.ManifestParser.PlayerInterface} */
  58.     this.playerInterface_ = null;
  60.     /** @private {?shaka.extern.ManifestConfiguration} */
  61.     this.config_ = null;
  63.     /** @private {number} */
  64.     this.globalId_ = 1;
  66.     /** @private {!Map.<string, string>} */
  67.     this.globalVariables_ = new Map();
  69.     /**
  70.      * A map from group id to stream infos created from the media tags.
  71.      * @private {!Map.<string, !Array.<?shaka.hls.HlsParser.StreamInfo>>}
  72.      */
  73.     this.groupIdToStreamInfosMap_ = new Map();
  75.     /**
  76.      * For media playlist lazy-loading to work in livestreams, we have to assume
  77.      * that each stream of a type (video, audio, etc) has the same mappings of
  78.      * sequence number to start time.
  79.      * This map stores those relationships.
  80.      * Only used during livestreams; we do not assume that VOD content is
  81.      * aligned in that way.
  82.      * @private {!Map.<string, !Map.<number, number>>}
  83.      */
  84.     this.mediaSequenceToStartTimeByType_ = new Map();
  86.     // Set initial maps.
  87.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  88.     this.mediaSequenceToStartTimeByType_.set(ContentType.VIDEO, new Map());
  89.     this.mediaSequenceToStartTimeByType_.set(ContentType.AUDIO, new Map());
  90.     this.mediaSequenceToStartTimeByType_.set(ContentType.TEXT, new Map());
  91.     this.mediaSequenceToStartTimeByType_.set(ContentType.IMAGE, new Map());
  93.     /**
  94.      * The values are strings of the form "<VIDEO URI> - <AUDIO URI>",
  95.      * where the URIs are the verbatim media playlist URIs as they appeared in
  96.      * the master playlist.
  97.      *
  98.      * Used to avoid duplicates that vary only in their text stream.
  99.      *
  100.      * @private {!Set.<string>}
  101.      */
  102.     this.variantUriSet_ = new Set();
  104.     /**
  105.      * A map from (verbatim) media playlist URI to stream infos representing the
  106.      * playlists.
  107.      *
  108.      * On update, used to iterate through and update from media playlists.
  109.      *
  110.      * On initial parse, used to iterate through and determine minimum
  111.      * timestamps, offsets, and to handle TS rollover.
  112.      *
  113.      * During parsing, used to avoid duplicates in the async methods
  114.      * createStreamInfoFromMediaTags_, createStreamInfoFromImageTag_ and
  115.      * createStreamInfoFromVariantTags_.
  116.      *
  117.      * @private {!Map.<string, shaka.hls.HlsParser.StreamInfo>}
  118.      */
  119.     this.uriToStreamInfosMap_ = new Map();
  121.     /** @private {?shaka.media.PresentationTimeline} */
  122.     this.presentationTimeline_ = null;
  124.     /**
  125.      * The master playlist URI, after redirects.
  126.      *
  127.      * @private {string}
  128.      */
  129.     this.masterPlaylistUri_ = '';
  131.     /** @private {shaka.hls.ManifestTextParser} */
  132.     this.manifestTextParser_ = new shaka.hls.ManifestTextParser();
  134.     /**
  135.      * The minimum sequence number for generated segments, when ignoring
  136.      * EXT-X-PROGRAM-DATE-TIME.
  137.      *
  138.      * @private {number}
  139.      */
  140.     this.minSequenceNumber_ = -1;
  142.     /**
  143.      * The lowest time value for any of the streams, as defined by the
  144.      * EXT-X-PROGRAM-DATE-TIME value. Measured in seconds since January 1, 1970.
  145.      *
  146.      * @private {number}
  147.      */
  148.     this.lowestSyncTime_ = Infinity;
  150.     /**
  151.      * Whether the streams have previously been "finalized"; that is to say,
  152.      * whether we have loaded enough streams to know information about the asset
  153.      * such as timing information, live status, etc.
  154.      *
  155.      * @private {boolean}
  156.      */
  157.     this.streamsFinalized_ = false;
  159.     /**
  160.      * Whether the manifest informs about the codec to use.
  161.      *
  162.      * @private
  163.      */
  164.     this.codecInfoInManifest_ = false;
  166.     /**
  167.      * This timer is used to trigger the start of a manifest update. A manifest
  168.      * update is async. Once the update is finished, the timer will be restarted
  169.      * to trigger the next update. The timer will only be started if the content
  170.      * is live content.
  171.      *
  172.      * @private {shaka.util.Timer}
  173.      */
  174.     this.updatePlaylistTimer_ = new shaka.util.Timer(() => {
  175.       this.onUpdate_();
  176.     });
  178.     /** @private {shaka.hls.HlsParser.PresentationType_} */
  179.     this.presentationType_ = shaka.hls.HlsParser.PresentationType_.VOD;
  181.     /** @private {?shaka.extern.Manifest} */
  182.     this.manifest_ = null;
  184.     /** @private {number} */
  185.     this.maxTargetDuration_ = 0;
  187.     /** @private {number} */
  188.     this.lastTargetDuration_ = Infinity;
  190.     /** Partial segments target duration.
  191.      * @private {number}
  192.      */
  193.     this.partialTargetDuration_ = 0;
  195.     /** @private {number} */
  196.     this.presentationDelay_ = 0;
  198.     /** @private {number} */
  199.     this.lowLatencyPresentationDelay_ = 0;
  201.     /** @private {shaka.util.OperationManager} */
  202.     this.operationManager_ = new shaka.util.OperationManager();
  204.     /** A map from closed captions' group id, to a map of closed captions info.
  205.      * {group id -> {closed captions channel id -> language}}
  206.      * @private {Map.<string, Map.<string, string>>}
  207.      */
  208.     this.groupIdToClosedCaptionsMap_ = new Map();
  210.     /** @private {Map.<string, string>} */
  211.     this.groupIdToCodecsMap_ = new Map();
  213.     /** A cache mapping EXT-X-MAP tag info to the InitSegmentReference created
  214.      * from the tag.
  215.      * The key is a string combining the EXT-X-MAP tag's absolute uri, and
  216.      * its BYTERANGE if available.
  217.      * {!Map.<string, !shaka.media.InitSegmentReference>} */
  218.     this.mapTagToInitSegmentRefMap_ = new Map();
  220.     /** @private {Map.<string, !shaka.extern.aesKey>} */
  221.     this.aesKeyInfoMap_ = new Map();
  223.     /** @private {Map.<string, !Promise.<shaka.extern.Response>>} */
  224.     this.aesKeyMap_ = new Map();
  226.     /** @private {Map.<string, !Promise.<shaka.extern.Response>>} */
  227.     this.identityKeyMap_ = new Map();
  229.     /** @private {Map.<!shaka.media.InitSegmentReference, ?string>} */
  230.     this.identityKidMap_ = new Map();
  232.     /** @private {boolean} */
  233.     this.lowLatencyMode_ = false;
  235.     /** @private {boolean} */
  236.     this.lowLatencyByterangeOptimization_ = false;
  238.     /**
  239.      * An ewma that tracks how long updates take.
  240.      * This is to mitigate issues caused by slow parsing on embedded devices.
  241.      * @private {!shaka.abr.Ewma}
  242.      */
  243.     this.averageUpdateDuration_ = new shaka.abr.Ewma(5);
  245.     /** @private {?shaka.util.ContentSteeringManager} */
  246.     this.contentSteeringManager_ = null;
  248.     /** @private {boolean} */
  249.     this.needsClosedCaptionsDetection_ = true;
  250.   }
  253.   /**
  254.    * @override
  255.    * @exportInterface
  256.    */
  257.   configure(config) {
  258.     this.config_ = config;
  260.     if (this.contentSteeringManager_) {
  261.       this.contentSteeringManager_.configure(this.config_);
  262.     }
  263.   }
  265.   /**
  266.    * @override
  267.    * @exportInterface
  268.    */
  269.   async start(uri, playerInterface) {
  270.     goog.asserts.assert(this.config_, 'Must call configure() before start()!');
  271.     this.playerInterface_ = playerInterface;
  272.     this.lowLatencyMode_ = playerInterface.isLowLatencyMode();
  274.     const response = await this.requestManifest_([uri]);
  276.     // Record the master playlist URI after redirects.
  277.     this.masterPlaylistUri_ = response.uri;
  279.     goog.asserts.assert(response.data, 'Response data should be non-null!');
  280.     await this.parseManifest_(response.data, uri);
  282.     goog.asserts.assert(this.manifest_, 'Manifest should be non-null');
  283.     return this.manifest_;
  284.   }
  286.   /**
  287.    * @override
  288.    * @exportInterface
  289.    */
  290.   stop() {
  291.     // Make sure we don't update the manifest again. Even if the timer is not
  292.     // running, this is safe to call.
  293.     if (this.updatePlaylistTimer_) {
  294.       this.updatePlaylistTimer_.stop();
  295.       this.updatePlaylistTimer_ = null;
  296.     }
  298.     /** @type {!Array.<!Promise>} */
  299.     const pending = [];
  301.     if (this.operationManager_) {
  302.       pending.push(this.operationManager_.destroy());
  303.       this.operationManager_ = null;
  304.     }
  306.     this.playerInterface_ = null;
  307.     this.config_ = null;
  308.     this.variantUriSet_.clear();
  309.     this.manifest_ = null;
  310.     this.uriToStreamInfosMap_.clear();
  311.     this.groupIdToStreamInfosMap_.clear();
  312.     this.groupIdToCodecsMap_.clear();
  313.     this.globalVariables_.clear();
  314.     this.mapTagToInitSegmentRefMap_.clear();
  315.     this.aesKeyInfoMap_.clear();
  316.     this.aesKeyMap_.clear();
  317.     this.identityKeyMap_.clear();
  318.     this.identityKidMap_.clear();
  320.     if (this.contentSteeringManager_) {
  321.       this.contentSteeringManager_.destroy();
  322.     }
  324.     return Promise.all(pending);
  325.   }
  327.   /**
  328.    * @override
  329.    * @exportInterface
  330.    */
  331.   async update() {
  332.     if (!this.isLive_()) {
  333.       return;
  334.     }
  336.     /** @type {!Array.<!Promise>} */
  337.     const updates = [];
  338.     const streamInfos = Array.from(this.uriToStreamInfosMap_.values());
  340.     // This is necessary to calculate correctly the update time.
  341.     this.lastTargetDuration_ = Infinity;
  343.     // Only update active streams.
  344.     const activeStreamInfos = streamInfos.filter((s) => s.stream.segmentIndex);
  345.     for (const streamInfo of activeStreamInfos) {
  346.       updates.push(this.updateStream_(streamInfo));
  347.     }
  348.     await Promise.all(updates);
  350.     // Now that streams have been updated, notify the presentation timeline.
  351.     this.notifySegmentsForStreams_(activeStreamInfos.map((s) => s.stream));
  353.     // If any hasEndList is false, the stream is still live.
  354.     const stillLive = activeStreamInfos.some((s) => s.hasEndList == false);
  355.     if (activeStreamInfos.length && !stillLive) {
  356.       // Convert the presentation to VOD and set the duration.
  357.       const PresentationType = shaka.hls.HlsParser.PresentationType_;
  358.       this.setPresentationType_(PresentationType.VOD);
  360.       // The duration is the minimum of the end times of all active streams.
  361.       // Non-active streams are not guaranteed to have useful maxTimestamp
  362.       // values, due to the lazy-loading system, so they are ignored.
  363.       const maxTimestamps = activeStreamInfos.map((s) => s.maxTimestamp);
  364.       // The duration is the minimum of the end times of all streams.
  365.       this.presentationTimeline_.setDuration(Math.min(...maxTimestamps));
  366.       this.playerInterface_.updateDuration();
  367.     }
  368.     if (stillLive) {
  369.       this.determineDuration_();
  370.     }
  371.   }
  373.   /**
  374.    * @param {!shaka.hls.HlsParser.StreamInfo} streamInfo
  375.    * @return {!Map.<number, number>}
  376.    * @private
  377.    */
  378.   getMediaSequenceToStartTimeFor_(streamInfo) {
  379.     if (this.isLive_()) {
  380.       return this.mediaSequenceToStartTimeByType_.get(streamInfo.type);
  381.     } else {
  382.       return streamInfo.mediaSequenceToStartTime;
  383.     }
  384.   }
  386.   /**
  387.    * Updates a stream.
  388.    *
  389.    * @param {!shaka.hls.HlsParser.StreamInfo} streamInfo
  390.    * @return {!Promise}
  391.    * @private
  392.    */
  393.   async updateStream_(streamInfo) {
  394.     const manifestUris = [];
  395.     for (const uri of streamInfo.getUris()) {
  396.       const uriObj = new goog.Uri(uri);
  397.       const queryData = uriObj.getQueryData();
  398.       if (streamInfo.canBlockReload) {
  399.         if (streamInfo.nextMediaSequence >= 0) {
  400.           // Indicates that the server must hold the request until a Playlist
  401.           // contains a Media Segment with Media Sequence
  402.           queryData.add('_HLS_msn', String(streamInfo.nextMediaSequence));
  403.         }
  404.         if (streamInfo.nextPart >= 0) {
  405.           // Indicates, in combination with _HLS_msn, that the server must hold
  406.           // the request until a Playlist contains Partial Segment N of Media
  407.           // Sequence Number M or later.
  408.           queryData.add('_HLS_part', String(streamInfo.nextPart));
  409.         }
  410.       }
  411.       if (streamInfo.canSkipSegments) {
  412.         // Enable delta updates. This will replace older segments with
  413.         // 'EXT-X-SKIP' tag in the media playlist.
  414.         queryData.add('_HLS_skip', 'YES');
  415.       }
  416.       if (queryData.getCount()) {
  417.         uriObj.setQueryData(queryData);
  418.       }
  419.       manifestUris.push(uriObj.toString());
  420.     }
  421.     const response =
  422.         await this.requestManifest_(manifestUris, /* isPlaylist= */ true);
  423.     if (!streamInfo.stream.segmentIndex) {
  424.       // The stream was closed since the update was first requested.
  425.       return;
  426.     }
  428.     /** @type {shaka.hls.Playlist} */
  429.     const playlist = this.manifestTextParser_.parsePlaylist(response.data);
  431.     if (playlist.type != shaka.hls.PlaylistType.MEDIA) {
  432.       throw new shaka.util.Error(
  433.           shaka.util.Error.Severity.CRITICAL,
  434.           shaka.util.Error.Category.MANIFEST,
  435.           shaka.util.Error.Code.HLS_INVALID_PLAYLIST_HIERARCHY);
  436.     }
  438.     // Record the final URI after redirects.
  439.     const responseUri = response.uri;
  440.     if (responseUri != response.originalUri &&
  441.         !streamInfo.getUris().includes(responseUri)) {
  442.       streamInfo.redirectUris.push(responseUri);
  443.     }
  445.     /** @type {!Array.<!shaka.hls.Tag>} */
  446.     const variablesTags = shaka.hls.Utils.filterTagsByName(playlist.tags,
  447.         'EXT-X-DEFINE');
  449.     const mediaVariables = this.parseMediaVariables_(
  450.         variablesTags, responseUri);
  452.     const stream = streamInfo.stream;
  454.     const mediaSequenceToStartTime =
  455.         this.getMediaSequenceToStartTimeFor_(streamInfo);
  456.     const {keyIds, drmInfos} = await this.parseDrmInfo_(
  457.         playlist, stream.mimeType, streamInfo.getUris, mediaVariables);
  459.     const keysAreEqual =
  460.       (a, b) => a.size === b.size && [...a].every((value) => b.has(value));
  462.     if (!keysAreEqual(stream.keyIds, keyIds)) {
  463.       stream.keyIds = keyIds;
  464.       stream.drmInfos = drmInfos;
  465.       this.playerInterface_.newDrmInfo(stream);
  466.     }
  468.     const {segments, bandwidth} = this.createSegments_(
  469.         playlist, mediaSequenceToStartTime, mediaVariables,
  470.         streamInfo.getUris, streamInfo.type);
  471.     if (bandwidth) {
  472.       stream.bandwidth = bandwidth;
  473.     }
  475.     stream.segmentIndex.mergeAndEvict(
  476.         segments, this.presentationTimeline_.getSegmentAvailabilityStart());
  477.     if (segments.length) {
  478.       const mediaSequenceNumber = shaka.hls.Utils.getFirstTagWithNameAsNumber(
  479.           playlist.tags, 'EXT-X-MEDIA-SEQUENCE', 0);
  480.       const skipTag = shaka.hls.Utils.getFirstTagWithName(
  481.           playlist.tags, 'EXT-X-SKIP');
  482.       const skippedSegments =
  483.           skipTag ? Number(skipTag.getAttributeValue('SKIPPED-SEGMENTS')) : 0;
  484.       const {nextMediaSequence, nextPart} =
  485.           this.getNextMediaSequenceAndPart_(mediaSequenceNumber, segments);
  486.       streamInfo.nextMediaSequence = nextMediaSequence + skippedSegments;
  487.       streamInfo.nextPart = nextPart;
  488.       const playlistStartTime = mediaSequenceToStartTime.get(
  489.           mediaSequenceNumber);
  490.       stream.segmentIndex.evict(playlistStartTime);
  491.     }
  492.     const oldSegment = stream.segmentIndex.earliestReference();
  493.     goog.asserts.assert(oldSegment, 'Should have segments!');
  495.     streamInfo.minTimestamp = oldSegment.startTime;
  497.     const newestSegment = segments[segments.length - 1];
  498.     goog.asserts.assert(newestSegment, 'Should have segments!');
  500.     streamInfo.maxTimestamp = newestSegment.endTime;
  502.     // Once the last segment has been added to the playlist,
  503.     // #EXT-X-ENDLIST tag will be appended.
  504.     // If that happened, treat the rest of the EVENT presentation as VOD.
  505.     const endListTag =
  506.         shaka.hls.Utils.getFirstTagWithName(playlist.tags, 'EXT-X-ENDLIST');
  508.     if (endListTag) {
  509.       // Flag this for later.  We don't convert the whole presentation into VOD
  510.       // until we've seen the ENDLIST tag for all active playlists.
  511.       streamInfo.hasEndList = true;
  512.     }
  514.     this.determineLastTargetDuration_(playlist);
  515.   }
  518.   /**
  519.    * @override
  520.    * @exportInterface
  521.    */
  522.   onExpirationUpdated(sessionId, expiration) {
  523.     // No-op
  524.   }
  526.   /**
  527.    * @override
  528.    * @exportInterface
  529.    */
  530.   onInitialVariantChosen(variant) {
  531.     // No-op
  532.   }
  534.   /**
  535.    * @override
  536.    * @exportInterface
  537.    */
  538.   banLocation(uri) {
  539.     if (this.contentSteeringManager_) {
  540.       this.contentSteeringManager_.banLocation(uri);
  541.     }
  542.   }
  544.   /**
  545.    * Align the streams by sequence number by dropping early segments.  Then
  546.    * offset the streams to begin at presentation time 0.
  547.    * @param {!Array.<!shaka.hls.HlsParser.StreamInfo>} streamInfos
  548.    * @private
  549.    */
  550.   syncStreamsWithSequenceNumber_(streamInfos) {
  551.     // We assume that, when this is first called, we have enough info to
  552.     // determine how to use the program date times (e.g. we have both a video
  553.     // and an audio, and all other videos and audios match those).
  554.     // Thus, we only need to calculate this once.
  555.     const updateMinSequenceNumber = this.minSequenceNumber_ == -1;
  556.     // Sync using media sequence number.  Find the highest starting sequence
  557.     // number among all streams.  Later, we will drop any references to
  558.     // earlier segments in other streams, then offset everything back to 0.
  559.     for (const streamInfo of streamInfos) {
  560.       const segmentIndex = streamInfo.stream.segmentIndex;
  561.       goog.asserts.assert(segmentIndex,
  562.           'Only loaded streams should be synced');
  563.       const mediaSequenceToStartTime =
  564.           this.getMediaSequenceToStartTimeFor_(streamInfo);
  565.       const segment0 = segmentIndex.earliestReference();
  566.       if (segment0) {
  567.         // This looks inefficient, but iteration order is insertion order.
  568.         // So the very first entry should be the one we want.
  569.         // We assert that this holds true so that we are alerted by debug
  570.         // builds and tests if it changes.  We still do a loop, though, so
  571.         // that the code functions correctly in production no matter what.
  572.         if (goog.DEBUG) {
  573.           const firstSequenceStartTime =
  574.               mediaSequenceToStartTime.values().next().value;
  575.           if (firstSequenceStartTime != segment0.startTime) {
  576.             shaka.log.warning(
  577.                 'Sequence number map is not ordered as expected!');
  578.           }
  579.         }
  580.         for (const [sequence, start] of mediaSequenceToStartTime) {
  581.           if (start == segment0.startTime) {
  582.             if (updateMinSequenceNumber) {
  583.               this.minSequenceNumber_ = Math.max(
  584.                   this.minSequenceNumber_, sequence);
  585.             }
  586.             // Even if we already have decided on a value for
  587.             // |this.minSequenceNumber_|, we still need to determine the first
  588.             // sequence number for the stream, to offset it in the code below.
  589.             streamInfo.firstSequenceNumber = sequence;
  590.             break;
  591.           }
  592.         }
  593.       }
  594.     }
  596.     if (this.minSequenceNumber_ < 0) {
  597.       // Nothing to sync.
  598.       return;
  599.     }
  601.     shaka.log.debug('Syncing HLS streams against base sequence number:',
  602.         this.minSequenceNumber_);
  604.     for (const streamInfo of streamInfos) {
  605.       if (!this.ignoreManifestProgramDateTimeFor_(streamInfo.type)) {
  606.         continue;
  607.       }
  608.       const segmentIndex = streamInfo.stream.segmentIndex;
  609.       if (segmentIndex) {
  610.         // Drop any earlier references.
  611.         const numSegmentsToDrop =
  612.             this.minSequenceNumber_ - streamInfo.firstSequenceNumber;
  613.         if (numSegmentsToDrop > 0) {
  614.           segmentIndex.dropFirstReferences(numSegmentsToDrop);
  616.           // Now adjust timestamps back to begin at 0.
  617.           const segmentN = segmentIndex.earliestReference();
  618.           if (segmentN) {
  619.             const streamOffset = -segmentN.startTime;
  620.             // Modify all SegmentReferences equally.
  621.             streamInfo.stream.segmentIndex.offset(streamOffset);
  622.             // Update other parts of streamInfo the same way.
  623.             this.offsetStreamInfo_(streamInfo, streamOffset);
  624.           }
  625.         }
  626.       }
  627.     }
  628.   }
  630.   /**
  631.    * Synchronize streams by the EXT-X-PROGRAM-DATE-TIME tags attached to their
  632.    * segments.  Also normalizes segment times so that the earliest segment in
  633.    * any stream is at time 0.
  634.    * @param {!Array.<!shaka.hls.HlsParser.StreamInfo>} streamInfos
  635.    * @private
  636.    */
  637.   syncStreamsWithProgramDateTime_(streamInfos) {
  638.     // We assume that, when this is first called, we have enough info to
  639.     // determine how to use the program date times (e.g. we have both a video
  640.     // and an audio, and all other videos and audios match those).
  641.     // Thus, we only need to calculate this once.
  642.     if (this.lowestSyncTime_ == Infinity) {
  643.       for (const streamInfo of streamInfos) {
  644.         const segmentIndex = streamInfo.stream.segmentIndex;
  645.         goog.asserts.assert(segmentIndex,
  646.             'Only loaded streams should be synced');
  647.         const segment0 = segmentIndex.earliestReference();
  648.         if (segment0 != null && segment0.syncTime != null) {
  649.           this.lowestSyncTime_ =
  650.               Math.min(this.lowestSyncTime_, segment0.syncTime);
  651.         }
  652.       }
  653.     }
  655.     const lowestSyncTime = this.lowestSyncTime_;
  656.     if (lowestSyncTime == Infinity) {
  657.       // Nothing to sync.
  658.       return;
  659.     }
  661.     shaka.log.debug('Syncing HLS streams against base time:', lowestSyncTime);
  663.     for (const streamInfo of this.uriToStreamInfosMap_.values()) {
  664.       if (this.ignoreManifestProgramDateTimeFor_(streamInfo.type)) {
  665.         continue;
  666.       }
  667.       const segmentIndex = streamInfo.stream.segmentIndex;
  668.       if (segmentIndex != null) {
  669.         // A segment's startTime should be based on its syncTime vs the lowest
  670.         // syncTime across all streams.  The earliest segment sync time from
  671.         // any stream will become presentation time 0.  If two streams start
  672.         // e.g. 6 seconds apart in syncTime, then their first segments will
  673.         // also start 6 seconds apart in presentation time.
  675.         const segment0 = segmentIndex.earliestReference();
  676.         if (segment0.syncTime == null) {
  677.           shaka.log.alwaysError('Missing EXT-X-PROGRAM-DATE-TIME for stream',
  678.               streamInfo.getUris(),
  679.               'Expect AV sync issues!');
  680.         } else {
  681.           // Stream metadata are offset by a fixed amount based on the
  682.           // first segment.
  683.           const segment0TargetTime = segment0.syncTime - lowestSyncTime;
  684.           const streamOffset = segment0TargetTime - segment0.startTime;
  685.           this.offsetStreamInfo_(streamInfo, streamOffset);
  687.           // This is computed across all segments separately to manage
  688.           // accumulated drift in durations.
  689.           for (const segment of segmentIndex) {
  690.             segment.syncAgainst(lowestSyncTime);
  691.           }
  692.         }
  693.       }
  694.     }
  695.   }
  697.   /**
  698.    * @param {!shaka.hls.HlsParser.StreamInfo} streamInfo
  699.    * @param {number} offset
  700.    * @private
  701.    */
  702.   offsetStreamInfo_(streamInfo, offset) {
  703.     // Adjust our accounting of the minimum timestamp.
  704.     streamInfo.minTimestamp += offset;
  706.     // Adjust our accounting of the maximum timestamp.
  707.     streamInfo.maxTimestamp += offset;
  708.     goog.asserts.assert(streamInfo.maxTimestamp >= 0,
  709.         'Negative maxTimestamp after adjustment!');
  711.     // Update our map from sequence number to start time.
  712.     const mediaSequenceToStartTime =
  713.         this.getMediaSequenceToStartTimeFor_(streamInfo);
  714.     for (const [key, value] of mediaSequenceToStartTime) {
  715.       mediaSequenceToStartTime.set(key, value + offset);
  716.     }
  718.     shaka.log.debug('Offset', offset, 'applied to',
  719.         streamInfo.getUris());
  720.   }
  722.   /**
  723.    * Parses the manifest.
  724.    *
  725.    * @param {BufferSource} data
  726.    * @param {string} uri
  727.    * @return {!Promise}
  728.    * @private
  729.    */
  730.   async parseManifest_(data, uri) {
  731.     const Utils = shaka.hls.Utils;
  733.     goog.asserts.assert(this.masterPlaylistUri_,
  734.         'Master playlist URI must be set before calling parseManifest_!');
  736.     const playlist = this.manifestTextParser_.parsePlaylist(data);
  738.     /** @type {!Array.<!shaka.hls.Tag>} */
  739.     const variablesTags = Utils.filterTagsByName(playlist.tags, 'EXT-X-DEFINE');
  741.     /** @type {!Array.<!shaka.extern.Variant>} */
  742.     let variants = [];
  743.     /** @type {!Array.<!shaka.extern.Stream>} */
  744.     let textStreams = [];
  745.     /** @type {!Array.<!shaka.extern.Stream>} */
  746.     let imageStreams = [];
  748.     // This assert is our own sanity check.
  749.     goog.asserts.assert(this.presentationTimeline_ == null,
  750.         'Presentation timeline created early!');
  751.     // We don't know if the presentation is VOD or live until we parse at least
  752.     // one media playlist, so make a VOD-style presentation timeline for now
  753.     // and change the type later if we discover this is live.
  754.     // Since the player will load the first variant chosen early in the process,
  755.     // there isn't a window during playback where the live-ness is unknown.
  756.     this.presentationTimeline_ = new shaka.media.PresentationTimeline(
  757.         /* presentationStartTime= */ null, /* delay= */ 0);
  758.     this.presentationTimeline_.setStatic(true);
  760.     const getUris = () => {
  761.       return [uri];
  762.     };
  764.     // Parsing a media playlist results in a single-variant stream.
  765.     if (playlist.type == shaka.hls.PlaylistType.MEDIA) {
  766.       this.needsClosedCaptionsDetection_ = false;
  768.       /** @type {!Array.<!shaka.hls.Tag>} */
  769.       const variablesTags = shaka.hls.Utils.filterTagsByName(playlist.tags,
  770.           'EXT-X-DEFINE');
  772.       const mediaVariables =
  773.           this.parseMediaVariables_(variablesTags, this.masterPlaylistUri_);
  775.       // Get necessary info for this stream. These are things we would normally
  776.       // find from the master playlist (e.g. from values on EXT-X-MEDIA tags).
  777.       const basicInfo = await this.getMediaPlaylistBasicInfo_(
  778.           playlist, getUris, mediaVariables);
  779.       const type = basicInfo.type;
  780.       const mimeType = basicInfo.mimeType;
  781.       const codecs = basicInfo.codecs;
  782.       const languageValue = basicInfo.language;
  783.       const height = basicInfo.height;
  784.       const width = basicInfo.width;
  785.       const channelsCount = basicInfo.channelCount;
  786.       const sampleRate = basicInfo.sampleRate;
  787.       const closedCaptions = basicInfo.closedCaptions;
  788.       const videoRange = basicInfo.videoRange;
  789.       const colorGamut = basicInfo.colorGamut;
  791.       // Some values we cannot figure out, and aren't important enough to ask
  792.       // the user to provide through config values. A lot of these are only
  793.       // relevant to ABR, which isn't necessary if there's only one variant.
  794.       // So these unknowns should be set to false or null, largely.
  795.       const spatialAudio = false;
  796.       const characteristics = null;
  797.       const forced = false; // Only relevant for text.
  798.       const primary = true; // This is the only stream!
  799.       const name = 'Media Playlist';
  801.       // Make the stream info, with those values.
  802.       const streamInfo = await this.convertParsedPlaylistIntoStreamInfo_(
  803.           this.globalId_++, mediaVariables, playlist, getUris, uri, codecs,
  804.           type, languageValue, primary, name, channelsCount, closedCaptions,
  805.           characteristics, forced, sampleRate, spatialAudio, mimeType);
  806.       this.uriToStreamInfosMap_.set(uri, streamInfo);
  808.       if (type == 'video') {
  809.         this.addVideoAttributes_(streamInfo.stream, width, height,
  810.             /* frameRate= */ null, videoRange, /* videoLayout= */ null,
  811.             colorGamut);
  812.       }
  814.       // Wrap the stream from that stream info with a variant.
  815.       variants.push({
  816.         id: 0,
  817.         language: this.getLanguage_(languageValue),
  818.         disabledUntilTime: 0,
  819.         primary: true,
  820.         audio: type == 'audio' ? streamInfo.stream : null,
  821.         video: type == 'video' ? streamInfo.stream : null,
  822.         bandwidth: streamInfo.stream.bandwidth || 0,
  823.         allowedByApplication: true,
  824.         allowedByKeySystem: true,
  825.         decodingInfos: [],
  826.       });
  827.     } else {
  828.       this.parseMasterVariables_(variablesTags);
  830.       /** @type {!Array.<!shaka.hls.Tag>} */
  831.       const mediaTags = Utils.filterTagsByName(
  832.           playlist.tags, 'EXT-X-MEDIA');
  833.       /** @type {!Array.<!shaka.hls.Tag>} */
  834.       const variantTags = Utils.filterTagsByName(
  835.           playlist.tags, 'EXT-X-STREAM-INF');
  836.       /** @type {!Array.<!shaka.hls.Tag>} */
  837.       const imageTags = Utils.filterTagsByName(
  838.           playlist.tags, 'EXT-X-IMAGE-STREAM-INF');
  839.       /** @type {!Array.<!shaka.hls.Tag>} */
  840.       const iFrameTags = Utils.filterTagsByName(
  841.           playlist.tags, 'EXT-X-I-FRAME-STREAM-INF');
  842.       /** @type {!Array.<!shaka.hls.Tag>} */
  843.       const sessionKeyTags = Utils.filterTagsByName(
  844.           playlist.tags, 'EXT-X-SESSION-KEY');
  845.       /** @type {!Array.<!shaka.hls.Tag>} */
  846.       const sessionDataTags = Utils.filterTagsByName(
  847.           playlist.tags, 'EXT-X-SESSION-DATA');
  848.       /** @type {!Array.<!shaka.hls.Tag>} */
  849.       const contentSteeringTags = Utils.filterTagsByName(
  850.           playlist.tags, 'EXT-X-CONTENT-STEERING');
  852.       this.processSessionData_(sessionDataTags);
  853.       await this.processContentSteering_(contentSteeringTags);
  855.       this.parseCodecs_(variantTags);
  857.       this.parseClosedCaptions_(mediaTags);
  858.       variants = await this.createVariantsForTags_(
  859.           variantTags, sessionKeyTags, mediaTags, getUris,
  860.           this.globalVariables_);
  861.       textStreams = this.parseTexts_(mediaTags);
  862.       imageStreams = await this.parseImages_(imageTags, iFrameTags);
  863.     }
  865.     // Make sure that the parser has not been destroyed.
  866.     if (!this.playerInterface_) {
  867.       throw new shaka.util.Error(
  868.           shaka.util.Error.Severity.CRITICAL,
  869.           shaka.util.Error.Category.PLAYER,
  870.           shaka.util.Error.Code.OPERATION_ABORTED);
  871.     }
  873.     // Single-variant streams aren't lazy-loaded, so for them we already have
  874.     // enough info here to determine the presentation type and duration.
  875.     if (playlist.type == shaka.hls.PlaylistType.MEDIA) {
  876.       if (this.isLive_()) {
  877.         this.changePresentationTimelineToLive_(playlist);
  878.         const delay = this.getUpdatePlaylistDelay_();
  879.         this.updatePlaylistTimer_.tickAfter(/* seconds= */ delay);
  880.       }
  881.       const streamInfos = Array.from(this.uriToStreamInfosMap_.values());
  882.       this.finalizeStreams_(streamInfos);
  883.       this.determineDuration_();
  884.     }
  886.     this.manifest_ = {
  887.       presentationTimeline: this.presentationTimeline_,
  888.       variants,
  889.       textStreams,
  890.       imageStreams,
  891.       offlineSessionIds: [],
  892.       minBufferTime: 0,
  893.       sequenceMode: this.config_.hls.sequenceMode,
  894.       ignoreManifestTimestampsInSegmentsMode:
  895.         this.config_.hls.ignoreManifestTimestampsInSegmentsMode,
  896.       type: shaka.media.ManifestParser.HLS,
  897.       serviceDescription: null,
  898.       nextUrl: null,
  899.     };
  901.     // If there is no 'CODECS' attribute in the manifest and codec guessing is
  902.     // disabled, we need to create the segment indexes now so that missing info
  903.     // can be parsed from the media data and added to the stream objects.
  904.     if (!this.codecInfoInManifest_ && this.config_.hls.disableCodecGuessing) {
  905.       const createIndexes = [];
  906.       for (const variant of this.manifest_.variants) {
  907.         if (variant.audio && variant.audio.codecs === '') {
  908.           createIndexes.push(variant.audio.createSegmentIndex());
  909.         }
  910.         if (variant.video && variant.video.codecs === '') {
  911.           createIndexes.push(variant.video.createSegmentIndex());
  912.         }
  913.       }
  915.       await Promise.all(createIndexes);
  916.     }
  918.     this.playerInterface_.makeTextStreamsForClosedCaptions(this.manifest_);
  920.     if (variants.length == 1) {
  921.       const createSegmentIndexPromises = [];
  922.       const variant = variants[0];
  923.       for (const stream of [variant.video, variant.audio]) {
  924.         if (stream && !stream.segmentIndex) {
  925.           createSegmentIndexPromises.push(stream.createSegmentIndex());
  926.         }
  927.       }
  928.       if (createSegmentIndexPromises.length > 0) {
  929.         await Promise.all(createSegmentIndexPromises);
  930.       }
  931.     }
  932.   }
  934.   /**
  935.    * @param {shaka.hls.Playlist} playlist
  936.    * @param {function():!Array.<string>} getUris
  937.    * @param {?Map.<string, string>=} variables
  938.    * @return {!Promise.<shaka.media.SegmentUtils.BasicInfo>}
  939.    * @private
  940.    */
  941.   async getMediaPlaylistBasicInfo_(playlist, getUris, variables) {
  942.     const HlsParser = shaka.hls.HlsParser;
  943.     const defaultBasicInfo = shaka.media.SegmentUtils.getBasicInfoFromMimeType(
  944.         this.config_.hls.mediaPlaylistFullMimeType);
  945.     if (!playlist.segments.length) {
  946.       return defaultBasicInfo;
  947.     }
  948.     const firstSegment = playlist.segments[0];
  949.     const firstSegmentUris = shaka.hls.Utils.constructSegmentUris(
  950.         getUris(),
  951.         firstSegment.verbatimSegmentUri,
  952.         variables);
  953.     const firstSegmentUri = firstSegmentUris[0];
  954.     const parsedUri = new goog.Uri(firstSegmentUri);
  955.     const extension = parsedUri.getPath().split('.').pop();
  956.     const rawMimeType = HlsParser.RAW_FORMATS_TO_MIME_TYPES_[extension];
  957.     if (rawMimeType) {
  958.       return shaka.media.SegmentUtils.getBasicInfoFromMimeType(
  959.           rawMimeType);
  960.     }
  962.     const requestType = shaka.net.NetworkingEngine.RequestType.SEGMENT;
  964.     let initData = null;
  965.     const initSegmentRef = this.getInitSegmentReference_(
  966.         playlist, firstSegment.tags, getUris, variables);
  967.     this.mapTagToInitSegmentRefMap_.clear();
  968.     if (initSegmentRef) {
  969.       const initSegmentRequest = shaka.util.Networking.createSegmentRequest(
  970.           initSegmentRef.getUris(),
  971.           initSegmentRef.getStartByte(),
  972.           initSegmentRef.getEndByte(),
  973.           this.config_.retryParameters);
  974.       const initType =
  975.           shaka.net.NetworkingEngine.AdvancedRequestType.INIT_SEGMENT;
  976.       const initResponse = await this.makeNetworkRequest_(
  977.           initSegmentRequest, requestType, {type: initType});
  978.       initData = initResponse.data;
  979.     }
  981.     let startByte = 0;
  982.     let endByte = null;
  983.     const byterangeTag = shaka.hls.Utils.getFirstTagWithName(
  984.         firstSegment.tags, 'EXT-X-BYTERANGE');
  985.     if (byterangeTag) {
  986.       [startByte, endByte] = this.parseByteRange_(
  987.           /* previousReference= */ null, byterangeTag.value);
  988.     }
  990.     const segmentRequest = shaka.util.Networking.createSegmentRequest(
  991.         firstSegmentUris, startByte, endByte, this.config_.retryParameters);
  992.     const type = shaka.net.NetworkingEngine.AdvancedRequestType.MEDIA_SEGMENT;
  993.     const response = await this.makeNetworkRequest_(
  994.         segmentRequest, requestType, {type});
  996.     let contentMimeType = response.headers['content-type'];
  997.     if (contentMimeType) {
  998.       // Split the MIME type in case the server sent additional parameters.
  999.       contentMimeType = contentMimeType.split(';')[0].toLowerCase();
  1000.     }
  1002.     if (extension == 'ts' || contentMimeType == 'video/mp2t') {
  1003.       const basicInfo =
  1004.           shaka.media.SegmentUtils.getBasicInfoFromTs(response.data);
  1005.       if (basicInfo) {
  1006.         return basicInfo;
  1007.       }
  1008.     } else if (extension == 'mp4' || extension == 'cmfv' ||
  1009.         extension == 'm4s' || extension == 'fmp4' ||
  1010.         contentMimeType == 'video/mp4' ||
  1011.         contentMimeType == 'audio/mp4' ||
  1012.         contentMimeType == 'video/iso.segment') {
  1013.       const basicInfo = shaka.media.SegmentUtils.getBasicInfoFromMp4(
  1014.           initData, response.data);
  1015.       if (basicInfo) {
  1016.         return basicInfo;
  1017.       }
  1018.     }
  1019.     return defaultBasicInfo;
  1020.   }
  1022.   /** @private */
  1023.   determineDuration_() {
  1024.     goog.asserts.assert(this.presentationTimeline_,
  1025.         'Presentation timeline not created!');
  1027.     if (this.isLive_()) {
  1028.       // The spec says nothing much about seeking in live content, but Safari's
  1029.       // built-in HLS implementation does not allow it.  Therefore we will set
  1030.       // the availability window equal to the presentation delay.  The player
  1031.       // will be able to buffer ahead three segments, but the seek window will
  1032.       // be zero-sized.
  1033.       const PresentationType = shaka.hls.HlsParser.PresentationType_;
  1035.       if (this.presentationType_ == PresentationType.LIVE) {
  1036.         let segmentAvailabilityDuration = this.getLiveDuration_();
  1038.         // This defaults to the presentation delay, which has the effect of
  1039.         // making the live stream unseekable.  This is consistent with Apple's
  1040.         // HLS implementation.
  1041.         if (this.config_.hls.useSafariBehaviorForLive) {
  1042.           segmentAvailabilityDuration = this.presentationTimeline_.getDelay();
  1043.         }
  1045.         // The app can override that with a longer duration, to allow seeking.
  1046.         if (!isNaN(this.config_.availabilityWindowOverride)) {
  1047.           segmentAvailabilityDuration = this.config_.availabilityWindowOverride;
  1048.         }
  1050.         this.presentationTimeline_.setSegmentAvailabilityDuration(
  1051.             segmentAvailabilityDuration);
  1052.       }
  1053.     } else {
  1054.       // Use the minimum duration as the presentation duration.
  1055.       this.presentationTimeline_.setDuration(this.getMinDuration_());
  1056.     }
  1058.     if (!this.presentationTimeline_.isStartTimeLocked()) {
  1059.       for (const streamInfo of this.uriToStreamInfosMap_.values()) {
  1060.         if (!streamInfo.stream.segmentIndex) {
  1061.           continue; // Not active.
  1062.         }
  1063.         if (streamInfo.type != 'audio' && streamInfo.type != 'video') {
  1064.           continue;
  1065.         }
  1066.         const firstReference = streamInfo.stream.segmentIndex.get(0);
  1067.         if (firstReference && firstReference.syncTime) {
  1068.           const syncTime = firstReference.syncTime;
  1069.           this.presentationTimeline_.setInitialProgramDateTime(syncTime);
  1070.         }
  1071.       }
  1072.     }
  1074.     // This is the first point where we have a meaningful presentation start
  1075.     // time, and we need to tell PresentationTimeline that so that it can
  1076.     // maintain consistency from here on.
  1077.     this.presentationTimeline_.lockStartTime();
  1079.     // This asserts that the live edge is being calculated from segment times.
  1080.     // For VOD and event streams, this check should still pass.
  1081.     goog.asserts.assert(
  1082.         !this.presentationTimeline_.usingPresentationStartTime(),
  1083.         'We should not be using the presentation start time in HLS!');
  1084.   }
  1086.   /**
  1087.    * Get the variables of each variant tag, and store in a map.
  1088.    * @param {!Array.<!shaka.hls.Tag>} tags Variant tags from the playlist.
  1089.    * @private
  1090.    */
  1091.   parseMasterVariables_(tags) {
  1092.     const queryParams = new goog.Uri(this.masterPlaylistUri_).getQueryData();
  1093.     for (const variableTag of tags) {
  1094.       const name = variableTag.getAttributeValue('NAME');
  1095.       const value = variableTag.getAttributeValue('VALUE');
  1096.       const queryParam = variableTag.getAttributeValue('QUERYPARAM');
  1097.       if (name && value) {
  1098.         if (!this.globalVariables_.has(name)) {
  1099.           this.globalVariables_.set(name, value);
  1100.         }
  1101.       }
  1102.       if (queryParam) {
  1103.         const queryParamValue = queryParams.get(queryParam)[0];
  1104.         if (queryParamValue && !this.globalVariables_.has(queryParamValue)) {
  1105.           this.globalVariables_.set(queryParam, queryParamValue);
  1106.         }
  1107.       }
  1108.     }
  1109.   }
  1111.   /**
  1112.    * Get the variables of each variant tag, and store in a map.
  1113.    * @param {!Array.<!shaka.hls.Tag>} tags Variant tags from the playlist.
  1114.    * @param {string} uri Media playlist URI.
  1115.    * @return {!Map.<string, string>}
  1116.    * @private
  1117.    */
  1118.   parseMediaVariables_(tags, uri) {
  1119.     const queryParams = new goog.Uri(uri).getQueryData();
  1120.     const mediaVariables = new Map();
  1121.     for (const variableTag of tags) {
  1122.       const name = variableTag.getAttributeValue('NAME');
  1123.       const value = variableTag.getAttributeValue('VALUE');
  1124.       const queryParam = variableTag.getAttributeValue('QUERYPARAM');
  1125.       const mediaImport = variableTag.getAttributeValue('IMPORT');
  1126.       if (name && value) {
  1127.         if (!mediaVariables.has(name)) {
  1128.           mediaVariables.set(name, value);
  1129.         }
  1130.       }
  1131.       if (queryParam) {
  1132.         const queryParamValue = queryParams.get(queryParam)[0];
  1133.         if (queryParamValue && !mediaVariables.has(queryParamValue)) {
  1134.           mediaVariables.set(queryParam, queryParamValue);
  1135.         }
  1136.       }
  1137.       if (mediaImport) {
  1138.         const globalValue = this.globalVariables_.get(mediaImport);
  1139.         if (globalValue) {
  1140.           mediaVariables.set(mediaImport, globalValue);
  1141.         }
  1142.       }
  1143.     }
  1144.     return mediaVariables;
  1145.   }
  1147.   /**
  1148.    * Get the codecs of each variant tag, and store in a map from
  1149.    * audio/video/subtitle group id to the codecs arraylist.
  1150.    * @param {!Array.<!shaka.hls.Tag>} tags Variant tags from the playlist.
  1151.    * @private
  1152.    */
  1153.   parseCodecs_(tags) {
  1154.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  1156.     for (const variantTag of tags) {
  1157.       const audioGroupId = variantTag.getAttributeValue('AUDIO');
  1158.       const videoGroupId = variantTag.getAttributeValue('VIDEO');
  1159.       const subGroupId = variantTag.getAttributeValue('SUBTITLES');
  1160.       const allCodecs = this.getCodecsForVariantTag_(variantTag);
  1162.       if (subGroupId) {
  1163.         const textCodecs = shaka.util.ManifestParserUtils.guessCodecsSafe(
  1164.             ContentType.TEXT, allCodecs);
  1165.         goog.asserts.assert(textCodecs != null, 'Text codecs should be valid.');
  1166.         this.groupIdToCodecsMap_.set(subGroupId, textCodecs);
  1167.         shaka.util.ArrayUtils.remove(allCodecs, textCodecs);
  1168.       }
  1169.       if (audioGroupId) {
  1170.         let codecs = shaka.util.ManifestParserUtils.guessCodecsSafe(
  1171.             ContentType.AUDIO, allCodecs);
  1172.         if (!codecs) {
  1173.           codecs = this.config_.hls.defaultAudioCodec;
  1174.         }
  1175.         this.groupIdToCodecsMap_.set(audioGroupId, codecs);
  1176.       }
  1177.       if (videoGroupId) {
  1178.         let codecs = shaka.util.ManifestParserUtils.guessCodecsSafe(
  1179.             ContentType.VIDEO, allCodecs);
  1180.         if (!codecs) {
  1181.           codecs = this.config_.hls.defaultVideoCodec;
  1182.         }
  1183.         this.groupIdToCodecsMap_.set(videoGroupId, codecs);
  1184.       }
  1185.     }
  1186.   }
  1188.   /**
  1189.    * Process EXT-X-SESSION-DATA tags.
  1190.    *
  1191.    * @param {!Array.<!shaka.hls.Tag>} tags
  1192.    * @private
  1193.    */
  1194.   processSessionData_(tags) {
  1195.     for (const tag of tags) {
  1196.       const id = tag.getAttributeValue('DATA-ID');
  1197.       const uri = tag.getAttributeValue('URI');
  1198.       const language = tag.getAttributeValue('LANGUAGE');
  1199.       const value = tag.getAttributeValue('VALUE');
  1200.       const data = (new Map()).set('id', id);
  1201.       if (uri) {
  1202.         data.set('uri', shaka.hls.Utils.constructSegmentUris(
  1203.             [this.masterPlaylistUri_], uri, this.globalVariables_)[0]);
  1204.       }
  1205.       if (language) {
  1206.         data.set('language', language);
  1207.       }
  1208.       if (value) {
  1209.         data.set('value', value);
  1210.       }
  1211.       const event = new shaka.util.FakeEvent('sessiondata', data);
  1212.       if (this.playerInterface_) {
  1213.         this.playerInterface_.onEvent(event);
  1214.       }
  1215.     }
  1216.   }
  1218.   /**
  1219.    * Process EXT-X-CONTENT-STEERING tags.
  1220.    *
  1221.    * @param {!Array.<!shaka.hls.Tag>} tags
  1222.    * @return {!Promise}
  1223.    * @private
  1224.    */
  1225.   async processContentSteering_(tags) {
  1226.     if (!this.playerInterface_ || !this.config_) {
  1227.       return;
  1228.     }
  1229.     let contentSteeringPromise;
  1230.     for (const tag of tags) {
  1231.       const defaultPathwayId = tag.getAttributeValue('PATHWAY-ID');
  1232.       const uri = tag.getAttributeValue('SERVER-URI');
  1233.       if (!defaultPathwayId || !uri) {
  1234.         continue;
  1235.       }
  1236.       this.contentSteeringManager_ =
  1237.             new shaka.util.ContentSteeringManager(this.playerInterface_);
  1238.       this.contentSteeringManager_.configure(this.config_);
  1239.       this.contentSteeringManager_.setBaseUris([this.masterPlaylistUri_]);
  1240.       this.contentSteeringManager_.setManifestType(
  1241.           shaka.media.ManifestParser.HLS);
  1242.       this.contentSteeringManager_.setDefaultPathwayId(defaultPathwayId);
  1243.       contentSteeringPromise =
  1244.           this.contentSteeringManager_.requestInfo(uri);
  1245.       break;
  1246.     }
  1247.     await contentSteeringPromise;
  1248.   }
  1250.   /**
  1251.    * Parse Subtitles and Closed Captions from 'EXT-X-MEDIA' tags.
  1252.    * Create text streams for Subtitles, but not Closed Captions.
  1253.    *
  1254.    * @param {!Array.<!shaka.hls.Tag>} mediaTags Media tags from the playlist.
  1255.    * @return {!Array.<!shaka.extern.Stream>}
  1256.    * @private
  1257.    */
  1258.   parseTexts_(mediaTags) {
  1259.     // Create text stream for each Subtitle media tag.
  1260.     const subtitleTags =
  1261.         shaka.hls.Utils.filterTagsByType(mediaTags, 'SUBTITLES');
  1262.     const textStreams = subtitleTags.map((tag) => {
  1263.       const disableText = this.config_.disableText;
  1264.       if (disableText) {
  1265.         return null;
  1266.       }
  1267.       try {
  1268.         return this.createStreamInfoFromMediaTags_([tag], new Map()).stream;
  1269.       } catch (e) {
  1270.         if (this.config_.hls.ignoreTextStreamFailures) {
  1271.           return null;
  1272.         }
  1273.         throw e;
  1274.       }
  1275.     });
  1277.     const type = shaka.util.ManifestParserUtils.ContentType.TEXT;
  1279.     // Set the codecs for text streams.
  1280.     for (const tag of subtitleTags) {
  1281.       const groupId = tag.getRequiredAttrValue('GROUP-ID');
  1282.       const codecs = this.groupIdToCodecsMap_.get(groupId);
  1283.       if (codecs) {
  1284.         const textStreamInfos = this.groupIdToStreamInfosMap_.get(groupId);
  1285.         if (textStreamInfos) {
  1286.           for (const textStreamInfo of textStreamInfos) {
  1287.             textStreamInfo.stream.codecs = codecs;
  1288.             textStreamInfo.stream.mimeType =
  1289.                 this.guessMimeTypeBeforeLoading_(type, codecs) ||
  1290.                 this.guessMimeTypeFallback_(type);
  1291.             this.setFullTypeForStream_(textStreamInfo.stream);
  1292.           }
  1293.         }
  1294.       }
  1295.     }
  1297.     // Do not create text streams for Closed captions.
  1298.     return textStreams.filter((s) => s);
  1299.   }
  1301.   /**
  1302.    * @param {!shaka.extern.Stream} stream
  1303.    * @private
  1304.    */
  1305.   setFullTypeForStream_(stream) {
  1306.     stream.fullMimeTypes = new Set([shaka.util.MimeUtils.getFullType(
  1307.         stream.mimeType, stream.codecs)]);
  1308.   }
  1310.   /**
  1311.    * @param {!Array.<!shaka.hls.Tag>} imageTags from the playlist.
  1312.    * @param {!Array.<!shaka.hls.Tag>} iFrameTags from the playlist.
  1313.    * @return {!Promise.<!Array.<!shaka.extern.Stream>>}
  1314.    * @private
  1315.    */
  1316.   async parseImages_(imageTags, iFrameTags) {
  1317.     // Create image stream for each image tag.
  1318.     const imageStreamPromises = imageTags.map(async (tag) => {
  1319.       const disableThumbnails = this.config_.disableThumbnails;
  1320.       if (disableThumbnails) {
  1321.         return null;
  1322.       }
  1323.       try {
  1324.         const streamInfo = await this.createStreamInfoFromImageTag_(tag);
  1325.         return streamInfo.stream;
  1326.       } catch (e) {
  1327.         if (this.config_.hls.ignoreImageStreamFailures) {
  1328.           return null;
  1329.         }
  1330.         throw e;
  1331.       }
  1332.     }).concat(iFrameTags.map((tag) => {
  1333.       const disableThumbnails = this.config_.disableThumbnails;
  1334.       if (disableThumbnails) {
  1335.         return null;
  1336.       }
  1337.       try {
  1338.         const streamInfo = this.createStreamInfoFromIframeTag_(tag);
  1339.         if (streamInfo.stream.codecs !== 'mjpg') {
  1340.           return null;
  1341.         }
  1342.         return streamInfo.stream;
  1343.       } catch (e) {
  1344.         if (this.config_.hls.ignoreImageStreamFailures) {
  1345.           return null;
  1346.         }
  1347.         throw e;
  1348.       }
  1349.     }));
  1350.     const imageStreams = await Promise.all(imageStreamPromises);
  1351.     return imageStreams.filter((s) => s);
  1352.   }
  1354.   /**
  1355.    * @param {!Array.<!shaka.hls.Tag>} mediaTags Media tags from the playlist.
  1356.    * @param {!Map.<string, string>} groupIdPathwayIdMapping
  1357.    * @private
  1358.    */
  1359.   createStreamInfosFromMediaTags_(mediaTags, groupIdPathwayIdMapping) {
  1360.     // Filter out subtitles and  media tags without uri.
  1361.     mediaTags = mediaTags.filter((tag) => {
  1362.       const uri = tag.getAttributeValue('URI') || '';
  1363.       const type = tag.getAttributeValue('TYPE');
  1364.       return type != 'SUBTITLES' && uri != '';
  1365.     });
  1367.     const groupedTags = {};
  1368.     for (const tag of mediaTags) {
  1369.       const key = tag.getTagKey();
  1370.       if (!groupedTags[key]) {
  1371.         groupedTags[key] = [tag];
  1372.       } else {
  1373.         groupedTags[key].push(tag);
  1374.       }
  1375.     }
  1377.     for (const key in groupedTags) {
  1378.       // Create stream info for each audio / video media grouped tag.
  1379.       this.createStreamInfoFromMediaTags_(
  1380.           groupedTags[key], groupIdPathwayIdMapping);
  1381.     }
  1382.   }
  1384.   /**
  1385.    * @param {!Array.<!shaka.hls.Tag>} tags Variant tags from the playlist.
  1386.    * @param {!Array.<!shaka.hls.Tag>} sessionKeyTags EXT-X-SESSION-KEY tags
  1387.    * from the playlist.
  1388.    * @param {!Array.<!shaka.hls.Tag>} mediaTags EXT-X-MEDIA tags from the
  1389.    * playlist.
  1390.    * @param {function():!Array.<string>} getUris
  1391.    * @param {?Map.<string, string>=} variables
  1392.    * @return {!Promise.<!Array.<!shaka.extern.Variant>>}
  1393.    * @private
  1394.    */
  1395.   async createVariantsForTags_(tags, sessionKeyTags, mediaTags, getUris,
  1396.       variables) {
  1397.     // EXT-X-SESSION-KEY processing
  1398.     const drmInfos = [];
  1399.     const keyIds = new Set();
  1400.     if (sessionKeyTags.length > 0) {
  1401.       for (const drmTag of sessionKeyTags) {
  1402.         const method = drmTag.getRequiredAttrValue('METHOD');
  1403.         // According to the HLS spec, KEYFORMAT is optional and implicitly
  1404.         // defaults to "identity".
  1405.         // https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis-11#section-4.4.4.4
  1406.         const keyFormat =
  1407.             drmTag.getAttributeValue('KEYFORMAT') || 'identity';
  1408.         let drmInfo = null;
  1409.         if (method == 'NONE') {
  1410.           continue;
  1411.         } else if (this.isAesMethod_(method)) {
  1412.           const keyUris = shaka.hls.Utils.constructSegmentUris(
  1413.               getUris(), drmTag.getRequiredAttrValue('URI'), variables);
  1414.           const keyMapKey = keyUris.sort().join('');
  1415.           if (!this.aesKeyMap_.has(keyMapKey)) {
  1416.             const requestType = shaka.net.NetworkingEngine.RequestType.KEY;
  1417.             const request = shaka.net.NetworkingEngine.makeRequest(
  1418.                 keyUris, this.config_.retryParameters);
  1419.             const keyResponse = this.makeNetworkRequest_(request, requestType);
  1420.             this.aesKeyMap_.set(keyMapKey, keyResponse);
  1421.           }
  1422.           continue;
  1423.         } else if (keyFormat == 'identity') {
  1424.           // eslint-disable-next-line no-await-in-loop
  1425.           drmInfo = await this.identityDrmParser_(
  1426.               drmTag, /* mimeType= */ '', getUris,
  1427.               /* initSegmentRef= */ null, variables);
  1428.         } else {
  1429.           const drmParser =
  1430.               shaka.hls.HlsParser.KEYFORMATS_TO_DRM_PARSERS_[keyFormat];
  1432.           drmInfo = drmParser ?
  1433.               drmParser(drmTag, /* mimeType= */ '') : null;
  1434.         }
  1435.         if (drmInfo) {
  1436.           if (drmInfo.keyIds) {
  1437.             for (const keyId of drmInfo.keyIds) {
  1438.               keyIds.add(keyId);
  1439.             }
  1440.           }
  1441.           drmInfos.push(drmInfo);
  1442.         } else {
  1443.           shaka.log.warning('Unsupported HLS KEYFORMAT', keyFormat);
  1444.         }
  1445.       }
  1446.     }
  1448.     const groupedTags = {};
  1449.     for (const tag of tags) {
  1450.       const key = tag.getTagKey();
  1451.       if (!groupedTags[key]) {
  1452.         groupedTags[key] = [tag];
  1453.       } else {
  1454.         groupedTags[key].push(tag);
  1455.       }
  1456.     }
  1458.     const allVariants = [];
  1459.     // Create variants for each group of variant tag.
  1460.     for (const key in groupedTags) {
  1461.       const tags = groupedTags[key];
  1462.       const firstTag = tags[0];
  1464.       const frameRate = firstTag.getAttributeValue('FRAME-RATE');
  1465.       const bandwidth =
  1466.           Number(firstTag.getAttributeValue('AVERAGE-BANDWIDTH')) ||
  1467.           Number(firstTag.getRequiredAttrValue('BANDWIDTH'));
  1469.       const resolution = firstTag.getAttributeValue('RESOLUTION');
  1470.       const [width, height] = resolution ? resolution.split('x') : [null, null];
  1472.       const videoRange = firstTag.getAttributeValue('VIDEO-RANGE');
  1474.       let videoLayout = firstTag.getAttributeValue('REQ-VIDEO-LAYOUT');
  1475.       if (videoLayout && videoLayout.includes(',')) {
  1476.         // If multiple video layout strings are present, pick the first valid
  1477.         // one.
  1478.         const layoutStrings = videoLayout.split(',').filter((layoutString) => {
  1479.           return layoutString == 'CH-STEREO' || layoutString == 'CH-MONO';
  1480.         });
  1481.         videoLayout = layoutStrings[0];
  1482.       }
  1483.       // According to the HLS spec:
  1484.       // By default a video variant is monoscopic, so an attribute
  1485.       // consisting entirely of REQ-VIDEO-LAYOUT="CH-MONO" is unnecessary
  1486.       // and SHOULD NOT be present.
  1487.       videoLayout = videoLayout || 'CH-MONO';
  1489.       const streamInfos = this.createStreamInfosForVariantTags_(tags,
  1490.           mediaTags, resolution, frameRate, bandwidth);
  1492.       goog.asserts.assert(streamInfos.audio.length ||
  1493.           streamInfos.video.length, 'We should have created a stream!');
  1495.       allVariants.push(...this.createVariants_(
  1496.           streamInfos.audio,
  1497.           streamInfos.video,
  1498.           bandwidth,
  1499.           width,
  1500.           height,
  1501.           frameRate,
  1502.           videoRange,
  1503.           videoLayout,
  1504.           drmInfos,
  1505.           keyIds));
  1506.     }
  1507.     return allVariants.filter((variant) => variant != null);
  1508.   }
  1510.   /**
  1511.    * Create audio and video streamInfos from an 'EXT-X-STREAM-INF' tag and its
  1512.    * related media tags.
  1513.    *
  1514.    * @param {!Array.<!shaka.hls.Tag>} tags
  1515.    * @param {!Array.<!shaka.hls.Tag>} mediaTags
  1516.    * @param {?string} resolution
  1517.    * @param {?string} frameRate
  1518.    * @param {number} bandwidth
  1519.    * @return {!shaka.hls.HlsParser.StreamInfos}
  1520.    * @private
  1521.    */
  1522.   createStreamInfosForVariantTags_(
  1523.       tags, mediaTags, resolution, frameRate, bandwidth) {
  1524.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  1526.     /** @type {shaka.hls.HlsParser.StreamInfos} */
  1527.     const res = {
  1528.       audio: [],
  1529.       video: [],
  1530.     };
  1531.     const groupIdPathwayIdMapping = new Map();
  1532.     const globalGroupIds = [];
  1533.     let isAudioGroup = false;
  1534.     let isVideoGroup = false;
  1535.     for (const tag of tags) {
  1536.       const audioGroupId = tag.getAttributeValue('AUDIO');
  1537.       const videoGroupId = tag.getAttributeValue('VIDEO');
  1538.       goog.asserts.assert(audioGroupId == null || videoGroupId == null,
  1539.           'Unexpected: both video and audio described by media tags!');
  1541.       const groupId = audioGroupId || videoGroupId;
  1542.       if (!groupId) {
  1543.         continue;
  1544.       }
  1545.       if (!globalGroupIds.includes(groupId)) {
  1546.         globalGroupIds.push(groupId);
  1547.       }
  1548.       const pathwayId = tag.getAttributeValue('PATHWAY-ID');
  1549.       if (pathwayId) {
  1550.         groupIdPathwayIdMapping.set(groupId, pathwayId);
  1551.       }
  1552.       if (audioGroupId) {
  1553.         isAudioGroup = true;
  1554.       } else if (videoGroupId) {
  1555.         isVideoGroup = true;
  1556.       }
  1557.       // Make an educated guess about the stream type.
  1558.       shaka.log.debug('Guessing stream type for', tag.toString());
  1559.     }
  1560.     if (globalGroupIds.length && mediaTags.length) {
  1561.       const mediaTagsForVariant = mediaTags.filter((tag) => {
  1562.         return globalGroupIds.includes(tag.getRequiredAttrValue('GROUP-ID'));
  1563.       });
  1564.       this.createStreamInfosFromMediaTags_(
  1565.           mediaTagsForVariant, groupIdPathwayIdMapping);
  1566.     }
  1567.     const globalGroupId = globalGroupIds.sort().join(',');
  1568.     const streamInfos =
  1569.         (globalGroupId && this.groupIdToStreamInfosMap_.has(globalGroupId)) ?
  1570.         this.groupIdToStreamInfosMap_.get(globalGroupId) : [];
  1571.     if (isAudioGroup) {
  1572.       res.audio.push(...streamInfos);
  1573.     } else if (isVideoGroup) {
  1574.       res.video.push(...streamInfos);
  1575.     }
  1577.     let type;
  1578.     let ignoreStream = false;
  1580.     // The Microsoft HLS manifest generators will make audio-only variants
  1581.     // that link to their URI both directly and through an audio tag.
  1582.     // In that case, ignore the local URI and use the version in the
  1583.     // AUDIO tag, so you inherit its language.
  1584.     // As an example, see the manifest linked in issue #860.
  1585.     const allStreamUris = tags.map((tag) => tag.getRequiredAttrValue('URI'));
  1586.     const hasSameUri = res.audio.find((audio) => {
  1587.       return audio && audio.getUris().find((uri) => {
  1588.         return allStreamUris.includes(uri);
  1589.       });
  1590.     });
  1592.     /** @type {!Array.<string>} */
  1593.     let allCodecs = this.getCodecsForVariantTag_(tags[0]);
  1594.     const videoCodecs = shaka.util.ManifestParserUtils.guessCodecsSafe(
  1595.         ContentType.VIDEO, allCodecs);
  1596.     const audioCodecs = shaka.util.ManifestParserUtils.guessCodecsSafe(
  1597.         ContentType.AUDIO, allCodecs);
  1599.     if (audioCodecs && !videoCodecs) {
  1600.       // There are no associated media tags, and there's only audio codec,
  1601.       // and no video codec, so it should be audio.
  1602.       type = ContentType.AUDIO;
  1603.       shaka.log.debug('Guessing audio-only.');
  1604.       ignoreStream = res.audio.length > 0;
  1605.     } else if (!res.audio.length && !res.video.length &&
  1606.         audioCodecs && videoCodecs) {
  1607.       // There are both audio and video codecs, so assume multiplexed content.
  1608.       // Note that the default used when CODECS is missing assumes multiple
  1609.       // (and therefore multiplexed).
  1610.       // Recombine the codec strings into one so that MediaSource isn't
  1611.       // lied to later. (That would trigger an error in Chrome.)
  1612.       shaka.log.debug('Guessing multiplexed audio+video.');
  1613.       type = ContentType.VIDEO;
  1614.       allCodecs = [[videoCodecs, audioCodecs].join(',')];
  1615.     } else if (res.audio.length && hasSameUri) {
  1616.       shaka.log.debug('Guessing audio-only.');
  1617.       type = ContentType.AUDIO;
  1618.       ignoreStream = true;
  1619.     } else if (res.video.length && !res.audio.length) {
  1620.       // There are associated video streams.  Assume this is audio.
  1621.       shaka.log.debug('Guessing audio-only.');
  1622.       type = ContentType.AUDIO;
  1623.     } else {
  1624.       shaka.log.debug('Guessing video-only.');
  1625.       type = ContentType.VIDEO;
  1626.     }
  1628.     if (!ignoreStream) {
  1629.       let language = null;
  1630.       let name = null;
  1631.       let channelsCount = null;
  1632.       let spatialAudio = false;
  1633.       let characteristics = null;
  1634.       let sampleRate = null;
  1635.       if (!streamInfos.length) {
  1636.         const mediaTag = mediaTags.find((tag) => {
  1637.           const uri = tag.getAttributeValue('URI') || '';
  1638.           const type = tag.getAttributeValue('TYPE');
  1639.           const groupId = tag.getRequiredAttrValue('GROUP-ID');
  1640.           return type != 'SUBTITLES' && uri == '' &&
  1641.               globalGroupIds.includes(groupId);
  1642.         });
  1643.         if (mediaTag) {
  1644.           language = mediaTag.getAttributeValue('LANGUAGE');
  1645.           name = mediaTag.getAttributeValue('NAME');
  1646.           channelsCount = this.getChannelsCount_(mediaTag);
  1647.           spatialAudio = this.isSpatialAudio_(mediaTag);
  1648.           characteristics = mediaTag.getAttributeValue('CHARACTERISTICS');
  1649.           sampleRate = this.getSampleRate_(mediaTag);
  1650.         }
  1651.       }
  1652.       const streamInfo = this.createStreamInfoFromVariantTags_(
  1653.           tags, allCodecs, type, language, name, channelsCount,
  1654.           characteristics, sampleRate, spatialAudio);
  1655.       if (globalGroupId) {
  1656.         streamInfo.stream.groupId = globalGroupId;
  1657.       }
  1658.       if (!streamInfos.length) {
  1659.         streamInfo.stream.bandwidth = bandwidth;
  1660.       }
  1661.       res[streamInfo.stream.type] = [streamInfo];
  1662.     }
  1663.     return res;
  1664.   }
  1667.   /**
  1668.    * Get the codecs from the 'EXT-X-STREAM-INF' tag.
  1669.    *
  1670.    * @param {!shaka.hls.Tag} tag
  1671.    * @return {!Array.<string>} codecs
  1672.    * @private
  1673.    */
  1674.   getCodecsForVariantTag_(tag) {
  1675.     let codecsString = tag.getAttributeValue('CODECS') || '';
  1677.     const supplementalCodecsString =
  1678.         tag.getAttributeValue('SUPPLEMENTAL-CODECS');
  1680.     this.codecInfoInManifest_ = codecsString.length > 0;
  1682.     if (!this.codecInfoInManifest_ && !this.config_.hls.disableCodecGuessing) {
  1683.       // These are the default codecs to assume if none are specified.
  1684.       const defaultCodecsArray = [];
  1686.       if (!this.config_.disableVideo) {
  1687.         defaultCodecsArray.push(this.config_.hls.defaultVideoCodec);
  1688.       }
  1689.       if (!this.config_.disableAudio) {
  1690.         defaultCodecsArray.push(this.config_.hls.defaultAudioCodec);
  1691.       }
  1693.       codecsString = defaultCodecsArray.join(',');
  1694.     }
  1696.     // Strip out internal whitespace while splitting on commas:
  1697.     /** @type {!Array.<string>} */
  1698.     const codecs = codecsString.split(/\s*,\s*/);
  1700.     if (supplementalCodecsString) {
  1701.       const supplementalCodecs = supplementalCodecsString.split(/\s*,\s*/)
  1702.           .map((codec) => {
  1703.             return codec.split('/')[0];
  1704.           });
  1705.       codecs.push(...supplementalCodecs);
  1706.     }
  1708.     return shaka.media.SegmentUtils.codecsFiltering(codecs);
  1709.   }
  1711.   /**
  1712.    * Get the channel count information for an HLS audio track.
  1713.    * CHANNELS specifies an ordered, "/" separated list of parameters.
  1714.    * If the type is audio, the first parameter will be a decimal integer
  1715.    * specifying the number of independent, simultaneous audio channels.
  1716.    * No other channels parameters are currently defined.
  1717.    *
  1718.    * @param {!shaka.hls.Tag} tag
  1719.    * @return {?number}
  1720.    * @private
  1721.    */
  1722.   getChannelsCount_(tag) {
  1723.     const channels = tag.getAttributeValue('CHANNELS');
  1724.     if (!channels) {
  1725.       return null;
  1726.     }
  1727.     const channelcountstring = channels.split('/')[0];
  1728.     const count = parseInt(channelcountstring, 10);
  1729.     return count;
  1730.   }
  1732.   /**
  1733.    * Get the sample rate information for an HLS audio track.
  1734.    *
  1735.    * @param {!shaka.hls.Tag} tag
  1736.    * @return {?number}
  1737.    * @private
  1738.    */
  1739.   getSampleRate_(tag) {
  1740.     const sampleRate = tag.getAttributeValue('SAMPLE-RATE');
  1741.     if (!sampleRate) {
  1742.       return null;
  1743.     }
  1744.     return parseInt(sampleRate, 10);
  1745.   }
  1747.   /**
  1748.    * Get the spatial audio information for an HLS audio track.
  1749.    * In HLS the channels field indicates the number of audio channels that the
  1750.    * stream has (eg: 2). In the case of Dolby Atmos, the complexity is
  1751.    * expressed with the number of channels followed by the word JOC
  1752.    * (eg: 16/JOC), so 16 would be the number of channels (eg: 7.3.6 layout),
  1753.    * and JOC indicates that the stream has spatial audio.
  1754.    * @see https://developer.apple.com/documentation/http_live_streaming/hls_authoring_specification_for_apple_devices/hls_authoring_specification_for_apple_devices_appendixes
  1755.    *
  1756.    * @param {!shaka.hls.Tag} tag
  1757.    * @return {boolean}
  1758.    * @private
  1759.    */
  1760.   isSpatialAudio_(tag) {
  1761.     const channels = tag.getAttributeValue('CHANNELS');
  1762.     if (!channels) {
  1763.       return false;
  1764.     }
  1765.     return channels.includes('/JOC');
  1766.   }
  1768.   /**
  1769.    * Get the closed captions map information for the EXT-X-STREAM-INF tag, to
  1770.    * create the stream info.
  1771.    * @param {!shaka.hls.Tag} tag
  1772.    * @param {string} type
  1773.    * @return {Map.<string, string>} closedCaptions
  1774.    * @private
  1775.    */
  1776.   getClosedCaptions_(tag, type) {
  1777.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  1778.     // The attribute of closed captions is optional, and the value may be
  1779.     // 'NONE'.
  1780.     const closedCaptionsAttr = tag.getAttributeValue('CLOSED-CAPTIONS');
  1782.     // EXT-X-STREAM-INF tags may have CLOSED-CAPTIONS attributes.
  1783.     // The value can be either a quoted-string or an enumerated-string with
  1784.     // the value NONE. If the value is a quoted-string, it MUST match the
  1785.     // value of the GROUP-ID attribute of an EXT-X-MEDIA tag elsewhere in the
  1786.     // Playlist whose TYPE attribute is CLOSED-CAPTIONS.
  1787.     if (type == ContentType.VIDEO) {
  1788.       if (closedCaptionsAttr) {
  1789.         if (closedCaptionsAttr != 'NONE') {
  1790.           return this.groupIdToClosedCaptionsMap_.get(closedCaptionsAttr);
  1791.         }
  1792.         this.needsClosedCaptionsDetection_ = false;
  1793.       } else if (!closedCaptionsAttr && this.groupIdToClosedCaptionsMap_.size) {
  1794.         for (const key of this.groupIdToClosedCaptionsMap_.keys()) {
  1795.           return this.groupIdToClosedCaptionsMap_.get(key);
  1796.         }
  1797.       }
  1798.     }
  1799.     return null;
  1800.   }
  1802.   /**
  1803.    * Get the normalized language value.
  1804.    *
  1805.    * @param {?string} languageValue
  1806.    * @return {string}
  1807.    * @private
  1808.    */
  1809.   getLanguage_(languageValue) {
  1810.     const LanguageUtils = shaka.util.LanguageUtils;
  1811.     return LanguageUtils.normalize(languageValue || 'und');
  1812.   }
  1814.   /**
  1815.    * Get the type value.
  1816.    * Shaka recognizes the content types 'audio', 'video', 'text', and 'image'.
  1817.    * The HLS 'subtitles' type needs to be mapped to 'text'.
  1818.    * @param {!shaka.hls.Tag} tag
  1819.    * @return {string}
  1820.    * @private
  1821.    */
  1822.   getType_(tag) {
  1823.     let type = tag.getRequiredAttrValue('TYPE').toLowerCase();
  1824.     if (type == 'subtitles') {
  1825.       type = shaka.util.ManifestParserUtils.ContentType.TEXT;
  1826.     }
  1827.     return type;
  1828.   }
  1830.   /**
  1831.    * @param {!Array.<shaka.hls.HlsParser.StreamInfo>} audioInfos
  1832.    * @param {!Array.<shaka.hls.HlsParser.StreamInfo>} videoInfos
  1833.    * @param {number} bandwidth
  1834.    * @param {?string} width
  1835.    * @param {?string} height
  1836.    * @param {?string} frameRate
  1837.    * @param {?string} videoRange
  1838.    * @param {?string} videoLayout
  1839.    * @param {!Array.<shaka.extern.DrmInfo>} drmInfos
  1840.    * @param {!Set.<string>} keyIds
  1841.    * @return {!Array.<!shaka.extern.Variant>}
  1842.    * @private
  1843.    */
  1844.   createVariants_(
  1845.       audioInfos, videoInfos, bandwidth, width, height, frameRate, videoRange,
  1846.       videoLayout, drmInfos, keyIds) {
  1847.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  1848.     const DrmUtils = shaka.util.DrmUtils;
  1850.     for (const info of videoInfos) {
  1851.       this.addVideoAttributes_(
  1852.           info.stream, width, height, frameRate, videoRange, videoLayout,
  1853.           /** colorGamut= */ null);
  1854.     }
  1856.     // In case of audio-only or video-only content or the audio/video is
  1857.     // disabled by the config, we create an array of one item containing
  1858.     // a null. This way, the double-loop works for all kinds of content.
  1859.     // NOTE: we currently don't have support for audio-only content.
  1860.     const disableAudio = this.config_.disableAudio;
  1861.     if (!audioInfos.length || disableAudio) {
  1862.       audioInfos = [null];
  1863.     }
  1864.     const disableVideo = this.config_.disableVideo;
  1865.     if (!videoInfos.length || disableVideo) {
  1866.       videoInfos = [null];
  1867.     }
  1869.     const variants = [];
  1870.     for (const audioInfo of audioInfos) {
  1871.       for (const videoInfo of videoInfos) {
  1872.         const audioStream = audioInfo ? audioInfo.stream : null;
  1873.         if (audioStream) {
  1874.           audioStream.drmInfos = drmInfos;
  1875.           audioStream.keyIds = keyIds;
  1876.         }
  1877.         const videoStream = videoInfo ? videoInfo.stream : null;
  1878.         if (videoStream) {
  1879.           videoStream.drmInfos = drmInfos;
  1880.           videoStream.keyIds = keyIds;
  1881.         }
  1882.         const audioDrmInfos = audioInfo ? audioInfo.stream.drmInfos : null;
  1883.         const videoDrmInfos = videoInfo ? videoInfo.stream.drmInfos : null;
  1884.         const videoStreamUri =
  1885.             videoInfo ? videoInfo.getUris().sort().join(',') : '';
  1886.         const audioStreamUri =
  1887.             audioInfo ? audioInfo.getUris().sort().join(',') : '';
  1888.         const variantUriKey = videoStreamUri + ' - ' + audioStreamUri;
  1890.         if (audioStream && videoStream) {
  1891.           if (!DrmUtils.areDrmCompatible(audioDrmInfos, videoDrmInfos)) {
  1892.             shaka.log.warning(
  1893.                 'Incompatible DRM info in HLS variant.  Skipping.');
  1894.             continue;
  1895.           }
  1896.         }
  1898.         if (this.variantUriSet_.has(variantUriKey)) {
  1899.           // This happens when two variants only differ in their text streams.
  1900.           shaka.log.debug(
  1901.               'Skipping variant which only differs in text streams.');
  1902.           continue;
  1903.         }
  1905.         // Since both audio and video are of the same type, this assertion will
  1906.         // catch certain mistakes at runtime that the compiler would miss.
  1907.         goog.asserts.assert(!audioStream ||
  1908.             audioStream.type == ContentType.AUDIO, 'Audio parameter mismatch!');
  1909.         goog.asserts.assert(!videoStream ||
  1910.             videoStream.type == ContentType.VIDEO, 'Video parameter mismatch!');
  1912.         const variant = {
  1913.           id: this.globalId_++,
  1914.           language: audioStream ? audioStream.language : 'und',
  1915.           disabledUntilTime: 0,
  1916.           primary: (!!audioStream && audioStream.primary) ||
  1917.               (!!videoStream && videoStream.primary),
  1918.           audio: audioStream,
  1919.           video: videoStream,
  1920.           bandwidth,
  1921.           allowedByApplication: true,
  1922.           allowedByKeySystem: true,
  1923.           decodingInfos: [],
  1924.         };
  1926.         variants.push(variant);
  1927.         this.variantUriSet_.add(variantUriKey);
  1928.       }
  1929.     }
  1930.     return variants;
  1931.   }
  1933.   /**
  1934.    * Parses an array of EXT-X-MEDIA tags, then stores the values of all tags
  1935.    * with TYPE="CLOSED-CAPTIONS" into a map of group id to closed captions.
  1936.    *
  1937.    * @param {!Array.<!shaka.hls.Tag>} mediaTags
  1938.    * @private
  1939.    */
  1940.   parseClosedCaptions_(mediaTags) {
  1941.     const closedCaptionsTags =
  1942.         shaka.hls.Utils.filterTagsByType(mediaTags, 'CLOSED-CAPTIONS');
  1943.     this.needsClosedCaptionsDetection_ = closedCaptionsTags.length == 0;
  1944.     for (const tag of closedCaptionsTags) {
  1945.       goog.asserts.assert(tag.name == 'EXT-X-MEDIA',
  1946.           'Should only be called on media tags!');
  1947.       const languageValue = tag.getAttributeValue('LANGUAGE');
  1948.       let language = this.getLanguage_(languageValue);
  1949.       if (!languageValue) {
  1950.         const nameValue = tag.getAttributeValue('NAME');
  1951.         if (nameValue) {
  1952.           language = nameValue;
  1953.         }
  1954.       }
  1956.       // The GROUP-ID value is a quoted-string that specifies the group to which
  1957.       // the Rendition belongs.
  1958.       const groupId = tag.getRequiredAttrValue('GROUP-ID');
  1960.       // The value of INSTREAM-ID is a quoted-string that specifies a Rendition
  1961.       // within the segments in the Media Playlist. This attribute is REQUIRED
  1962.       // if the TYPE attribute is CLOSED-CAPTIONS.
  1963.       // We need replace SERVICE string by our internal svc string.
  1964.       const instreamId = tag.getRequiredAttrValue('INSTREAM-ID')
  1965.           .replace('SERVICE', 'svc');
  1966.       if (!this.groupIdToClosedCaptionsMap_.get(groupId)) {
  1967.         this.groupIdToClosedCaptionsMap_.set(groupId, new Map());
  1968.       }
  1969.       this.groupIdToClosedCaptionsMap_.get(groupId).set(instreamId, language);
  1970.     }
  1971.   }
  1973.   /**
  1974.    * Parse EXT-X-MEDIA media tag into a Stream object.
  1975.    *
  1976.    * @param {!Array.<!shaka.hls.Tag>} tags
  1977.    * @param {!Map.<string, string>} groupIdPathwayIdMapping
  1978.    * @return {!shaka.hls.HlsParser.StreamInfo}
  1979.    * @private
  1980.    */
  1981.   createStreamInfoFromMediaTags_(tags, groupIdPathwayIdMapping) {
  1982.     const verbatimMediaPlaylistUris = [];
  1983.     const globalGroupIds = [];
  1984.     const groupIdUriMappping = new Map();
  1985.     for (const tag of tags) {
  1986.       goog.asserts.assert(tag.name == 'EXT-X-MEDIA',
  1987.           'Should only be called on media tags!');
  1988.       const uri = tag.getRequiredAttrValue('URI');
  1989.       const groupId = tag.getRequiredAttrValue('GROUP-ID');
  1990.       verbatimMediaPlaylistUris.push(uri);
  1991.       globalGroupIds.push(groupId);
  1992.       groupIdUriMappping.set(groupId, uri);
  1993.     }
  1995.     const globalGroupId = globalGroupIds.sort().join(',');
  1996.     const firstTag = tags[0];
  1997.     let codecs = '';
  1998.     /** @type {string} */
  1999.     const type = this.getType_(firstTag);
  2000.     if (type == shaka.util.ManifestParserUtils.ContentType.TEXT) {
  2001.       codecs = firstTag.getAttributeValue('CODECS') || '';
  2002.     } else {
  2003.       for (const groupId of globalGroupIds) {
  2004.         if (this.groupIdToCodecsMap_.has(groupId)) {
  2005.           codecs = this.groupIdToCodecsMap_.get(groupId);
  2006.           break;
  2007.         }
  2008.       }
  2009.     }
  2011.     // Check if the stream has already been created as part of another Variant
  2012.     // and return it if it has.
  2013.     const key = verbatimMediaPlaylistUris.sort().join(',');
  2014.     if (this.uriToStreamInfosMap_.has(key)) {
  2015.       return this.uriToStreamInfosMap_.get(key);
  2016.     }
  2017.     const streamId = this.globalId_++;
  2018.     if (this.contentSteeringManager_) {
  2019.       for (const [groupId, uri] of groupIdUriMappping) {
  2020.         const pathwayId = groupIdPathwayIdMapping.get(groupId);
  2021.         if (pathwayId) {
  2022.           this.contentSteeringManager_.addLocation(streamId, pathwayId, uri);
  2023.         }
  2024.       }
  2025.     }
  2027.     const language = firstTag.getAttributeValue('LANGUAGE');
  2028.     const name = firstTag.getAttributeValue('NAME');
  2030.     // NOTE: According to the HLS spec, "DEFAULT=YES" requires "AUTOSELECT=YES".
  2031.     // However, we don't bother to validate "AUTOSELECT", since we don't
  2032.     // actually use it in our streaming model, and we treat everything as
  2033.     // "AUTOSELECT=YES".  A value of "AUTOSELECT=NO" would imply that it may
  2034.     // only be selected explicitly by the user, and we don't have a way to
  2035.     // represent that in our model.
  2036.     const defaultAttrValue = firstTag.getAttributeValue('DEFAULT');
  2037.     const primary = defaultAttrValue == 'YES';
  2039.     const channelsCount =
  2040.         type == 'audio' ? this.getChannelsCount_(firstTag) : null;
  2041.     const spatialAudio =
  2042.         type == 'audio' ? this.isSpatialAudio_(firstTag) : false;
  2043.     const characteristics = firstTag.getAttributeValue('CHARACTERISTICS');
  2045.     const forcedAttrValue = firstTag.getAttributeValue('FORCED');
  2046.     const forced = forcedAttrValue == 'YES';
  2047.     const sampleRate = type == 'audio' ? this.getSampleRate_(firstTag) : null;
  2048.     // TODO: Should we take into account some of the currently ignored
  2049.     // attributes: INSTREAM-ID, Attribute descriptions: https://bit.ly/2lpjOhj
  2050.     const streamInfo = this.createStreamInfo_(
  2051.         streamId, verbatimMediaPlaylistUris, codecs, type, language,
  2052.         primary, name, channelsCount, /* closedCaptions= */ null,
  2053.         characteristics, forced, sampleRate, spatialAudio);
  2054.     if (streamInfo.stream) {
  2055.       streamInfo.stream.groupId = globalGroupId;
  2056.     }
  2057.     if (this.groupIdToStreamInfosMap_.has(globalGroupId)) {
  2058.       this.groupIdToStreamInfosMap_.get(globalGroupId).push(streamInfo);
  2059.     } else {
  2060.       this.groupIdToStreamInfosMap_.set(globalGroupId, [streamInfo]);
  2061.     }
  2063.     this.uriToStreamInfosMap_.set(key, streamInfo);
  2064.     return streamInfo;
  2065.   }
  2067.   /**
  2068.    * Parse EXT-X-IMAGE-STREAM-INF media tag into a Stream object.
  2069.    *
  2070.    * @param {shaka.hls.Tag} tag
  2071.    * @return {!Promise.<!shaka.hls.HlsParser.StreamInfo>}
  2072.    * @private
  2073.    */
  2074.   async createStreamInfoFromImageTag_(tag) {
  2075.     goog.asserts.assert(tag.name == 'EXT-X-IMAGE-STREAM-INF',
  2076.         'Should only be called on image tags!');
  2077.     /** @type {string} */
  2078.     const type = shaka.util.ManifestParserUtils.ContentType.IMAGE;
  2080.     const verbatimImagePlaylistUri = tag.getRequiredAttrValue('URI');
  2081.     const codecs = tag.getAttributeValue('CODECS', 'jpeg') || '';
  2083.     // Check if the stream has already been created as part of another Variant
  2084.     // and return it if it has.
  2085.     if (this.uriToStreamInfosMap_.has(verbatimImagePlaylistUri)) {
  2086.       return this.uriToStreamInfosMap_.get(verbatimImagePlaylistUri);
  2087.     }
  2089.     const language = tag.getAttributeValue('LANGUAGE');
  2090.     const name = tag.getAttributeValue('NAME');
  2092.     const characteristics = tag.getAttributeValue('CHARACTERISTICS');
  2094.     const streamInfo = this.createStreamInfo_(
  2095.         this.globalId_++, [verbatimImagePlaylistUri], codecs, type, language,
  2096.         /* primary= */ false, name, /* channelsCount= */ null,
  2097.         /* closedCaptions= */ null, characteristics, /* forced= */ false,
  2098.         /* sampleRate= */ null, /* spatialAudio= */ false);
  2100.     // Parse misc attributes.
  2101.     const resolution = tag.getAttributeValue('RESOLUTION');
  2102.     if (resolution) {
  2103.       // The RESOLUTION tag represents the resolution of a single thumbnail, not
  2104.       // of the entire sheet at once (like we expect in the output).
  2105.       // So multiply by the layout size.
  2107.       // Since we need to have generated the segment index for this, we can't
  2108.       // lazy-load in this situation.
  2109.       await streamInfo.stream.createSegmentIndex();
  2111.       const reference = streamInfo.stream.segmentIndex.get(0);
  2112.       const layout = reference.getTilesLayout();
  2113.       if (layout) {
  2114.         streamInfo.stream.width =
  2115.             Number(resolution.split('x')[0]) * Number(layout.split('x')[0]);
  2116.         streamInfo.stream.height =
  2117.             Number(resolution.split('x')[1]) * Number(layout.split('x')[1]);
  2118.         // TODO: What happens if there are multiple grids, with different
  2119.         // layout sizes, inside this image stream?
  2120.       }
  2121.     }
  2122.     const bandwidth = tag.getAttributeValue('BANDWIDTH');
  2123.     if (bandwidth) {
  2124.       streamInfo.stream.bandwidth = Number(bandwidth);
  2125.     }
  2127.     this.uriToStreamInfosMap_.set(verbatimImagePlaylistUri, streamInfo);
  2128.     return streamInfo;
  2129.   }
  2131.   /**
  2132.    * Parse EXT-X-I-FRAME-STREAM-INF media tag into a Stream object.
  2133.    *
  2134.    * @param {shaka.hls.Tag} tag
  2135.    * @return {!shaka.hls.HlsParser.StreamInfo}
  2136.    * @private
  2137.    */
  2138.   createStreamInfoFromIframeTag_(tag) {
  2139.     goog.asserts.assert(tag.name == 'EXT-X-I-FRAME-STREAM-INF',
  2140.         'Should only be called on iframe tags!');
  2141.     /** @type {string} */
  2142.     const type = shaka.util.ManifestParserUtils.ContentType.IMAGE;
  2144.     const verbatimIFramePlaylistUri = tag.getRequiredAttrValue('URI');
  2145.     const codecs = tag.getAttributeValue('CODECS') || '';
  2147.     // Check if the stream has already been created as part of another Variant
  2148.     // and return it if it has.
  2149.     if (this.uriToStreamInfosMap_.has(verbatimIFramePlaylistUri)) {
  2150.       return this.uriToStreamInfosMap_.get(verbatimIFramePlaylistUri);
  2151.     }
  2153.     const language = tag.getAttributeValue('LANGUAGE');
  2154.     const name = tag.getAttributeValue('NAME');
  2156.     const characteristics = tag.getAttributeValue('CHARACTERISTICS');
  2158.     const streamInfo = this.createStreamInfo_(
  2159.         this.globalId_++, [verbatimIFramePlaylistUri], codecs, type, language,
  2160.         /* primary= */ false, name, /* channelsCount= */ null,
  2161.         /* closedCaptions= */ null, characteristics, /* forced= */ false,
  2162.         /* sampleRate= */ null, /* spatialAudio= */ false);
  2164.     // Parse misc attributes.
  2165.     const resolution = tag.getAttributeValue('RESOLUTION');
  2166.     const [width, height] = resolution ? resolution.split('x') : [null, null];
  2167.     streamInfo.stream.width = Number(width) || undefined;
  2168.     streamInfo.stream.height = Number(height) || undefined;
  2169.     const bandwidth = tag.getAttributeValue('BANDWIDTH');
  2170.     if (bandwidth) {
  2171.       streamInfo.stream.bandwidth = Number(bandwidth);
  2172.     }
  2174.     this.uriToStreamInfosMap_.set(verbatimIFramePlaylistUri, streamInfo);
  2175.     return streamInfo;
  2176.   }
  2178.   /**
  2179.    * Parse an EXT-X-STREAM-INF media tag into a Stream object.
  2180.    *
  2181.    * @param {!Array.<!shaka.hls.Tag>} tags
  2182.    * @param {!Array.<string>} allCodecs
  2183.    * @param {string} type
  2184.    * @param {?string} language
  2185.    * @param {?string} name
  2186.    * @param {?number} channelsCount
  2187.    * @param {?string} characteristics
  2188.    * @param {?number} sampleRate
  2189.    * @param {boolean} spatialAudio
  2190.    * @return {!shaka.hls.HlsParser.StreamInfo}
  2191.    * @private
  2192.    */
  2193.   createStreamInfoFromVariantTags_(tags, allCodecs, type, language, name,
  2194.       channelsCount, characteristics, sampleRate, spatialAudio) {
  2195.     const streamId = this.globalId_++;
  2196.     const verbatimMediaPlaylistUris = [];
  2197.     for (const tag of tags) {
  2198.       goog.asserts.assert(tag.name == 'EXT-X-STREAM-INF',
  2199.           'Should only be called on variant tags!');
  2200.       const uri = tag.getRequiredAttrValue('URI');
  2201.       const pathwayId = tag.getAttributeValue('PATHWAY-ID');
  2202.       if (this.contentSteeringManager_ && pathwayId) {
  2203.         this.contentSteeringManager_.addLocation(streamId, pathwayId, uri);
  2204.       }
  2205.       verbatimMediaPlaylistUris.push(uri);
  2206.     }
  2208.     const key = verbatimMediaPlaylistUris.sort().join(',');
  2209.     if (this.uriToStreamInfosMap_.has(key)) {
  2210.       return this.uriToStreamInfosMap_.get(key);
  2211.     }
  2213.     const closedCaptions = this.getClosedCaptions_(tags[0], type);
  2214.     const codecs = shaka.util.ManifestParserUtils.guessCodecs(type, allCodecs);
  2215.     const streamInfo = this.createStreamInfo_(
  2216.         streamId, verbatimMediaPlaylistUris, codecs, type, language,
  2217.         /* primary= */ false, name, channelsCount, closedCaptions,
  2218.         characteristics, /* forced= */ false, sampleRate,
  2219.         /* spatialAudio= */ false);
  2221.     this.uriToStreamInfosMap_.set(key, streamInfo);
  2222.     return streamInfo;
  2223.   }
  2226.   /**
  2227.    * @param {number} streamId
  2228.    * @param {!Array.<string>} verbatimMediaPlaylistUris
  2229.    * @param {string} codecs
  2230.    * @param {string} type
  2231.    * @param {?string} languageValue
  2232.    * @param {boolean} primary
  2233.    * @param {?string} name
  2234.    * @param {?number} channelsCount
  2235.    * @param {Map.<string, string>} closedCaptions
  2236.    * @param {?string} characteristics
  2237.    * @param {boolean} forced
  2238.    * @param {?number} sampleRate
  2239.    * @param {boolean} spatialAudio
  2240.    * @return {!shaka.hls.HlsParser.StreamInfo}
  2241.    * @private
  2242.    */
  2243.   createStreamInfo_(streamId, verbatimMediaPlaylistUris, codecs, type,
  2244.       languageValue, primary, name, channelsCount, closedCaptions,
  2245.       characteristics, forced, sampleRate, spatialAudio) {
  2246.     // TODO: Refactor, too many parameters
  2248.     // This stream is lazy-loaded inside the createSegmentIndex function.
  2249.     // So we start out with a stream object that does not contain the actual
  2250.     // segment index, then download when createSegmentIndex is called.
  2251.     const stream = this.makeStreamObject_(streamId, codecs, type,
  2252.         languageValue, primary, name, channelsCount, closedCaptions,
  2253.         characteristics, forced, sampleRate, spatialAudio);
  2255.     const redirectUris = [];
  2256.     const getUris = () => {
  2257.       if (this.contentSteeringManager_ &&
  2258.           verbatimMediaPlaylistUris.length > 1) {
  2259.         return this.contentSteeringManager_.getLocations(streamId);
  2260.       }
  2261.       return redirectUris.concat(shaka.hls.Utils.constructUris(
  2262.           [this.masterPlaylistUri_], verbatimMediaPlaylistUris,
  2263.           this.globalVariables_));
  2264.     };
  2265.     const streamInfo = {
  2266.       stream,
  2267.       type,
  2268.       redirectUris,
  2269.       getUris,
  2270.       // These values are filled out or updated after lazy-loading:
  2271.       minTimestamp: 0,
  2272.       maxTimestamp: 0,
  2273.       mediaSequenceToStartTime: new Map(),
  2274.       canSkipSegments: false,
  2275.       canBlockReload: false,
  2276.       hasEndList: false,
  2277.       firstSequenceNumber: -1,
  2278.       nextMediaSequence: -1,
  2279.       nextPart: -1,
  2280.       loadedOnce: false,
  2281.     };
  2283.     /** @param {!AbortSignal} abortSignal */
  2284.     const downloadSegmentIndex = async (abortSignal) => {
  2285.       const ContentType = shaka.util.ManifestParserUtils.ContentType;
  2287.       const uris = streamInfo.getUris();
  2288.       // Download the actual manifest.
  2289.       const response = await this.requestManifest_(
  2290.           streamInfo.getUris(), /* isPlaylist= */ true);
  2291.       if (abortSignal.aborted) {
  2292.         return;
  2293.       }
  2295.       // Record the final URI after redirects.
  2296.       const responseUri = response.uri;
  2297.       if (responseUri != response.originalUri && !uris.includes(responseUri)) {
  2298.         redirectUris.push(responseUri);
  2299.       }
  2301.       // Record the redirected, final URI of this media playlist when we parse
  2302.       // it.
  2303.       /** @type {!shaka.hls.Playlist} */
  2304.       const playlist = this.manifestTextParser_.parsePlaylist(response.data);
  2306.       if (playlist.type != shaka.hls.PlaylistType.MEDIA) {
  2307.         throw new shaka.util.Error(
  2308.             shaka.util.Error.Severity.CRITICAL,
  2309.             shaka.util.Error.Category.MANIFEST,
  2310.             shaka.util.Error.Code.HLS_INVALID_PLAYLIST_HIERARCHY);
  2311.       }
  2313.       /** @type {!Array.<!shaka.hls.Tag>} */
  2314.       const variablesTags = shaka.hls.Utils.filterTagsByName(playlist.tags,
  2315.           'EXT-X-DEFINE');
  2317.       const mediaVariables =
  2318.           this.parseMediaVariables_(variablesTags, responseUri);
  2320.       let mimeType = undefined;
  2322.       let closedCaptionsUpdated = false;
  2324.       // If no codec info was provided in the manifest and codec guessing is
  2325.       // disabled we try to get necessary info from the media data.
  2326.       if ((!this.codecInfoInManifest_ &&
  2327.           this.config_.hls.disableCodecGuessing) ||
  2328.           (this.needsClosedCaptionsDetection_ && type == ContentType.VIDEO &&
  2329.           !this.config_.hls.disableClosedCaptionsDetection)) {
  2330.         let canRequestBasicInfo = playlist.segments.length > 0;
  2331.         if (canRequestBasicInfo) {
  2332.           const segment = playlist.segments[0];
  2333.           if (shaka.hls.Utils.getFirstTagWithName(segment.tags, 'EXT-X-GAP')) {
  2334.             canRequestBasicInfo = false;
  2335.           }
  2336.         }
  2337.         if (canRequestBasicInfo) {
  2338.           this.needsClosedCaptionsDetection_ = false;
  2339.           const basicInfo = await this.getMediaPlaylistBasicInfo_(
  2340.               playlist, getUris, mediaVariables);
  2342.           goog.asserts.assert(
  2343.               type === basicInfo.type, 'Media types should match!');
  2345.           if (basicInfo.closedCaptions.size && (!closedCaptions ||
  2346.               closedCaptions.size != basicInfo.closedCaptions.size)) {
  2347.             closedCaptions = basicInfo.closedCaptions;
  2348.             closedCaptionsUpdated = true;
  2349.           }
  2351.           if (!this.codecInfoInManifest_ &&
  2352.               this.config_.hls.disableCodecGuessing) {
  2353.             mimeType = basicInfo.mimeType;
  2354.             codecs = basicInfo.codecs;
  2355.           }
  2356.         }
  2357.       }
  2359.       const wasLive = this.isLive_();
  2360.       const realStreamInfo = await this.convertParsedPlaylistIntoStreamInfo_(
  2361.           streamId, mediaVariables, playlist, getUris, responseUri, codecs,
  2362.           type, languageValue, primary, name, channelsCount, closedCaptions,
  2363.           characteristics, forced, sampleRate, spatialAudio, mimeType);
  2364.       if (abortSignal.aborted) {
  2365.         return;
  2366.       }
  2368.       const realStream = realStreamInfo.stream;
  2370.       if (this.isLive_() && !wasLive) {
  2371.         // Now that we know that the presentation is live, convert the timeline
  2372.         // to live.
  2373.         this.changePresentationTimelineToLive_(playlist);
  2374.       }
  2376.       // Copy values from the real stream info to our initial one.
  2377.       streamInfo.minTimestamp = realStreamInfo.minTimestamp;
  2378.       streamInfo.maxTimestamp = realStreamInfo.maxTimestamp;
  2379.       streamInfo.canSkipSegments = realStreamInfo.canSkipSegments;
  2380.       streamInfo.canBlockReload = realStreamInfo.canBlockReload;
  2381.       streamInfo.hasEndList = realStreamInfo.hasEndList;
  2382.       streamInfo.mediaSequenceToStartTime =
  2383.           realStreamInfo.mediaSequenceToStartTime;
  2384.       streamInfo.nextMediaSequence = realStreamInfo.nextMediaSequence;
  2385.       streamInfo.nextPart = realStreamInfo.nextPart;
  2386.       streamInfo.loadedOnce = true;
  2387.       stream.segmentIndex = realStream.segmentIndex;
  2388.       stream.encrypted = realStream.encrypted;
  2389.       stream.drmInfos = realStream.drmInfos;
  2390.       stream.keyIds = realStream.keyIds;
  2391.       stream.mimeType = realStream.mimeType;
  2392.       stream.bandwidth = stream.bandwidth || realStream.bandwidth;
  2393.       stream.codecs = stream.codecs || realStream.codecs;
  2394.       stream.closedCaptions =
  2395.           stream.closedCaptions || realStream.closedCaptions;
  2396.       this.setFullTypeForStream_(stream);
  2398.       // Since we lazy-loaded this content, the player may need to create new
  2399.       // sessions for the DRM info in this stream.
  2400.       if (stream.drmInfos.length) {
  2401.         this.playerInterface_.newDrmInfo(stream);
  2402.       }
  2404.       if (this.manifest_ && closedCaptionsUpdated) {
  2405.         this.playerInterface_.makeTextStreamsForClosedCaptions(this.manifest_);
  2406.       }
  2408.       if (type == ContentType.VIDEO || type == ContentType.AUDIO) {
  2409.         for (const otherStreamInfo of this.uriToStreamInfosMap_.values()) {
  2410.           if (!otherStreamInfo.loadedOnce && otherStreamInfo.type == type) {
  2411.             // To aid manifest filtering, assume before loading that all video
  2412.             // renditions have the same MIME type.  (And likewise for audio.)
  2413.             otherStreamInfo.stream.mimeType = realStream.mimeType;
  2414.             this.setFullTypeForStream_(otherStreamInfo.stream);
  2415.           }
  2416.         }
  2417.       }
  2419.       if (type == ContentType.TEXT) {
  2420.         const firstSegment = realStream.segmentIndex.get(0);
  2421.         if (firstSegment && firstSegment.initSegmentReference) {
  2422.           stream.mimeType = 'application/mp4';
  2423.           this.setFullTypeForStream_(stream);
  2424.         }
  2425.       }
  2427.       // Add finishing touches to the stream that can only be done once we have
  2428.       // more full context on the media as a whole.
  2429.       if (this.hasEnoughInfoToFinalizeStreams_()) {
  2430.         if (!this.streamsFinalized_) {
  2431.           // Mark this manifest as having been finalized, so we don't go through
  2432.           // this whole process of finishing touches a second time.
  2433.           this.streamsFinalized_ = true;
  2434.           // Finalize all of the currently-loaded streams.
  2435.           const streamInfos = Array.from(this.uriToStreamInfosMap_.values());
  2436.           const activeStreamInfos =
  2437.               streamInfos.filter((s) => s.stream.segmentIndex);
  2438.           this.finalizeStreams_(activeStreamInfos);
  2439.           // With the addition of this new stream, we now have enough info to
  2440.           // figure out how long the streams should be. So process all streams
  2441.           // we have downloaded up until this point.
  2442.           this.determineDuration_();
  2443.           // Finally, start the update timer, if this asset has been determined
  2444.           // to be a livestream.
  2445.           const delay = this.getUpdatePlaylistDelay_();
  2446.           if (delay > 0) {
  2447.             this.updatePlaylistTimer_.tickAfter(/* seconds= */ delay);
  2448.           }
  2449.         } else {
  2450.           // We don't need to go through the full process; just finalize this
  2451.           // single stream.
  2452.           this.finalizeStreams_([streamInfo]);
  2453.         }
  2454.       }
  2455.     };
  2457.     /** @type {Promise} */
  2458.     let creationPromise = null;
  2459.     /** @type {!AbortController} */
  2460.     let abortController = new AbortController();
  2461.     const safeCreateSegmentIndex = () => {
  2462.       // An operation is already in progress.  The second and subsequent
  2463.       // callers receive the same Promise as the first caller, and only one
  2464.       // download operation will occur.
  2465.       if (creationPromise) {
  2466.         return creationPromise;
  2467.       }
  2469.       // Create a new AbortController to be able to cancel this specific
  2470.       // download.
  2471.       abortController = new AbortController();
  2473.       // Create a Promise tied to the outcome of downloadSegmentIndex().  If
  2474.       // downloadSegmentIndex is rejected, creationPromise will also be
  2475.       // rejected.
  2476.       creationPromise = new Promise((resolve) => {
  2477.         resolve(downloadSegmentIndex(abortController.signal));
  2478.       });
  2479.       return creationPromise;
  2480.     };
  2482.     stream.createSegmentIndex = safeCreateSegmentIndex;
  2484.     stream.closeSegmentIndex = () => {
  2485.       // If we're mid-creation, cancel it.
  2486.       if (creationPromise && !stream.segmentIndex) {
  2487.         abortController.abort();
  2488.       }
  2489.       // If we have a segment index, release it.
  2490.       if (stream.segmentIndex) {
  2491.         stream.segmentIndex.release();
  2492.         stream.segmentIndex = null;
  2493.       }
  2494.       // Clear the creation Promise so that a new operation can begin.
  2495.       creationPromise = null;
  2496.     };
  2498.     return streamInfo;
  2499.   }
  2501.   /**
  2502.    * @return {number}
  2503.    * @private
  2504.    */
  2505.   getMinDuration_() {
  2506.     let minDuration = Infinity;
  2507.     for (const streamInfo of this.uriToStreamInfosMap_.values()) {
  2508.       if (streamInfo.stream.segmentIndex && streamInfo.stream.type != 'text') {
  2509.         // Since everything is already offset to 0 (either by sync or by being
  2510.         // VOD), only maxTimestamp is necessary to compute the duration.
  2511.         minDuration = Math.min(minDuration, streamInfo.maxTimestamp);
  2512.       }
  2513.     }
  2514.     return minDuration;
  2515.   }
  2517.   /**
  2518.    * @return {number}
  2519.    * @private
  2520.    */
  2521.   getLiveDuration_() {
  2522.     let maxTimestamp = Infinity;
  2523.     let minTimestamp = Infinity;
  2524.     for (const streamInfo of this.uriToStreamInfosMap_.values()) {
  2525.       if (streamInfo.stream.segmentIndex && streamInfo.stream.type != 'text') {
  2526.         maxTimestamp = Math.min(maxTimestamp, streamInfo.maxTimestamp);
  2527.         minTimestamp = Math.min(minTimestamp, streamInfo.minTimestamp);
  2528.       }
  2529.     }
  2530.     return maxTimestamp - minTimestamp;
  2531.   }
  2533.   /**
  2534.    * @param {!Array.<!shaka.extern.Stream>} streams
  2535.    * @private
  2536.    */
  2537.   notifySegmentsForStreams_(streams) {
  2538.     const references = [];
  2539.     for (const stream of streams) {
  2540.       if (!stream.segmentIndex) {
  2541.         // The stream was closed since the list of streams was built.
  2542.         continue;
  2543.       }
  2544.       stream.segmentIndex.forEachTopLevelReference((reference) => {
  2545.         references.push(reference);
  2546.       });
  2547.     }
  2548.     this.presentationTimeline_.notifySegments(references);
  2549.   }
  2551.   /**
  2552.    * @param {!Array.<!shaka.hls.HlsParser.StreamInfo>} streamInfos
  2553.    * @private
  2554.    */
  2555.   finalizeStreams_(streamInfos) {
  2556.     if (!this.isLive_()) {
  2557.       const minDuration = this.getMinDuration_();
  2558.       for (const streamInfo of streamInfos) {
  2559.         streamInfo.stream.segmentIndex.fit(/* periodStart= */ 0, minDuration);
  2560.       }
  2561.     }
  2562.     this.notifySegmentsForStreams_(streamInfos.map((s) => s.stream));
  2563.     if (this.config_.hls.ignoreManifestProgramDateTime) {
  2564.       this.syncStreamsWithSequenceNumber_(streamInfos);
  2565.     } else {
  2566.       this.syncStreamsWithProgramDateTime_(streamInfos);
  2567.       if (this.config_.hls.ignoreManifestProgramDateTimeForTypes.length > 0) {
  2568.         this.syncStreamsWithSequenceNumber_(streamInfos);
  2569.       }
  2570.     }
  2571.   }
  2573.   /**
  2574.    * @param {string} type
  2575.    * @return {boolean}
  2576.    * @private
  2577.    */
  2578.   ignoreManifestProgramDateTimeFor_(type) {
  2579.     if (this.config_.hls.ignoreManifestProgramDateTime) {
  2580.       return true;
  2581.     }
  2582.     const forTypes = this.config_.hls.ignoreManifestProgramDateTimeForTypes;
  2583.     return forTypes.includes(type);
  2584.   }
  2586.   /**
  2587.    * There are some values on streams that can only be set once we know about
  2588.    * both the video and audio content, if present.
  2589.    * This checks if there is at least one video downloaded (if the media has
  2590.    * video), and that there is at least one audio downloaded (if the media has
  2591.    * audio).
  2592.    * @return {boolean}
  2593.    * @private
  2594.    */
  2595.   hasEnoughInfoToFinalizeStreams_() {
  2596.     if (!this.manifest_) {
  2597.       return false;
  2598.     }
  2599.     const videos = [];
  2600.     const audios = [];
  2601.     for (const variant of this.manifest_.variants) {
  2602.       if (variant.video) {
  2603.         videos.push(variant.video);
  2604.       }
  2605.       if (variant.audio) {
  2606.         audios.push(variant.audio);
  2607.       }
  2608.     }
  2609.     if (videos.length > 0 && !videos.some((stream) => stream.segmentIndex)) {
  2610.       return false;
  2611.     }
  2612.     if (audios.length > 0 && !audios.some((stream) => stream.segmentIndex)) {
  2613.       return false;
  2614.     }
  2615.     return true;
  2616.   }
  2618.   /**
  2619.    * @param {number} streamId
  2620.    * @param {!shaka.hls.Playlist} playlist
  2621.    * @param {function():!Array.<string>} getUris
  2622.    * @param {string} responseUri
  2623.    * @param {string} codecs
  2624.    * @param {string} type
  2625.    * @param {?string} languageValue
  2626.    * @param {boolean} primary
  2627.    * @param {?string} name
  2628.    * @param {?number} channelsCount
  2629.    * @param {Map.<string, string>} closedCaptions
  2630.    * @param {?string} characteristics
  2631.    * @param {boolean} forced
  2632.    * @param {?number} sampleRate
  2633.    * @param {boolean} spatialAudio
  2634.    * @param {(string|undefined)} mimeType
  2635.    * @return {!Promise.<!shaka.hls.HlsParser.StreamInfo>}
  2636.    * @private
  2637.    */
  2638.   async convertParsedPlaylistIntoStreamInfo_(streamId, variables, playlist,
  2639.       getUris, responseUri, codecs, type, languageValue, primary, name,
  2640.       channelsCount, closedCaptions, characteristics, forced, sampleRate,
  2641.       spatialAudio, mimeType = undefined) {
  2642.     goog.asserts.assert(playlist.segments != null,
  2643.         'Media playlist should have segments!');
  2645.     this.determinePresentationType_(playlist);
  2647.     if (this.isLive_()) {
  2648.       this.determineLastTargetDuration_(playlist);
  2649.     }
  2651.     const mediaSequenceToStartTime = this.isLive_() ?
  2652.         this.mediaSequenceToStartTimeByType_.get(type) : new Map();
  2654.     const {segments, bandwidth} = this.createSegments_(
  2655.         playlist, mediaSequenceToStartTime, variables, getUris, type);
  2657.     if (!mimeType) {
  2658.       mimeType = await this.guessMimeType_(type, codecs, segments);
  2659.     }
  2661.     const {drmInfos, keyIds, encrypted, aesEncrypted} =
  2662.         await this.parseDrmInfo_(playlist, mimeType, getUris, variables);
  2664.     if (encrypted && !drmInfos.length && !aesEncrypted) {
  2665.       throw new shaka.util.Error(
  2666.           shaka.util.Error.Severity.CRITICAL,
  2667.           shaka.util.Error.Category.MANIFEST,
  2668.           shaka.util.Error.Code.HLS_KEYFORMATS_NOT_SUPPORTED);
  2669.     }
  2671.     const stream = this.makeStreamObject_(streamId, codecs, type,
  2672.         languageValue, primary, name, channelsCount, closedCaptions,
  2673.         characteristics, forced, sampleRate, spatialAudio);
  2674.     stream.encrypted = encrypted;
  2675.     stream.drmInfos = drmInfos;
  2676.     stream.keyIds = keyIds;
  2677.     stream.mimeType = mimeType;
  2678.     if (bandwidth) {
  2679.       stream.bandwidth = bandwidth;
  2680.     }
  2681.     this.setFullTypeForStream_(stream);
  2683.     // This new calculation is necessary for Low Latency streams.
  2684.     if (this.isLive_()) {
  2685.       this.determineLastTargetDuration_(playlist);
  2686.     }
  2688.     const firstStartTime = segments[0].startTime;
  2689.     const lastSegment = segments[segments.length - 1];
  2690.     const lastEndTime = lastSegment.endTime;
  2691.     /** @type {!shaka.media.SegmentIndex} */
  2692.     const segmentIndex = new shaka.media.SegmentIndex(segments);
  2693.     stream.segmentIndex = segmentIndex;
  2695.     const serverControlTag = shaka.hls.Utils.getFirstTagWithName(
  2696.         playlist.tags, 'EXT-X-SERVER-CONTROL');
  2697.     const canSkipSegments = serverControlTag ?
  2698.           serverControlTag.getAttribute('CAN-SKIP-UNTIL') != null : false;
  2699.     const canBlockReload = serverControlTag ?
  2700.           serverControlTag.getAttribute('CAN-BLOCK-RELOAD') != null : false;
  2702.     const mediaSequenceNumber = shaka.hls.Utils.getFirstTagWithNameAsNumber(
  2703.         playlist.tags, 'EXT-X-MEDIA-SEQUENCE', 0);
  2705.     const {nextMediaSequence, nextPart} =
  2706.         this.getNextMediaSequenceAndPart_(mediaSequenceNumber, segments);
  2708.     return {
  2709.       stream,
  2710.       type,
  2711.       redirectUris: [],
  2712.       getUris,
  2713.       minTimestamp: firstStartTime,
  2714.       maxTimestamp: lastEndTime,
  2715.       canSkipSegments,
  2716.       canBlockReload,
  2717.       hasEndList: false,
  2718.       firstSequenceNumber: -1,
  2719.       nextMediaSequence,
  2720.       nextPart,
  2721.       mediaSequenceToStartTime,
  2722.       loadedOnce: false,
  2723.     };
  2724.   }
  2726.   /**
  2727.    * Get the next msn and part
  2728.    *
  2729.    * @param {number} mediaSequenceNumber
  2730.    * @param {!Array.<!shaka.media.SegmentReference>} segments
  2731.    * @return {{nextMediaSequence: number, nextPart:number}}}
  2732.    * @private
  2733.    */
  2734.   getNextMediaSequenceAndPart_(mediaSequenceNumber, segments) {
  2735.     const currentMediaSequence = mediaSequenceNumber + segments.length - 1;
  2736.     let nextMediaSequence = currentMediaSequence;
  2737.     let nextPart = -1;
  2738.     if (!segments.length) {
  2739.       nextMediaSequence++;
  2740.       return {
  2741.         nextMediaSequence,
  2742.         nextPart,
  2743.       };
  2744.     }
  2745.     const lastSegment = segments[segments.length - 1];
  2746.     const partialReferences = lastSegment.partialReferences;
  2747.     if (!lastSegment.partialReferences.length) {
  2748.       nextMediaSequence++;
  2749.       if (lastSegment.hasByterangeOptimization()) {
  2750.         nextPart = 0;
  2751.       }
  2752.       return {
  2753.         nextMediaSequence,
  2754.         nextPart,
  2755.       };
  2756.     }
  2757.     nextPart = partialReferences.length - 1;
  2758.     const lastPartialReference =
  2759.         partialReferences[partialReferences.length - 1];
  2760.     if (!lastPartialReference.isPreload()) {
  2761.       nextMediaSequence++;
  2762.       nextPart = 0;
  2763.     }
  2764.     return {
  2765.       nextMediaSequence,
  2766.       nextPart,
  2767.     };
  2768.   }
  2771.   /**
  2772.    * Creates a stream object with the given parameters.
  2773.    * The parameters that are passed into here are only the things that can be
  2774.    * known without downloading the media playlist; other values must be set
  2775.    * manually on the object after creation.
  2776.    * @param {number} id
  2777.    * @param {string} codecs
  2778.    * @param {string} type
  2779.    * @param {?string} languageValue
  2780.    * @param {boolean} primary
  2781.    * @param {?string} name
  2782.    * @param {?number} channelsCount
  2783.    * @param {Map.<string, string>} closedCaptions
  2784.    * @param {?string} characteristics
  2785.    * @param {boolean} forced
  2786.    * @param {?number} sampleRate
  2787.    * @param {boolean} spatialAudio
  2788.    * @return {!shaka.extern.Stream}
  2789.    * @private
  2790.    */
  2791.   makeStreamObject_(id, codecs, type, languageValue, primary, name,
  2792.       channelsCount, closedCaptions, characteristics, forced, sampleRate,
  2793.       spatialAudio) {
  2794.     // Fill out a "best-guess" mimeType, for now. It will be replaced once the
  2795.     // stream is lazy-loaded.
  2796.     const mimeType = this.guessMimeTypeBeforeLoading_(type, codecs) ||
  2797.         this.guessMimeTypeFallback_(type);
  2798.     const roles = [];
  2799.     if (characteristics) {
  2800.       for (const characteristic of characteristics.split(',')) {
  2801.         roles.push(characteristic);
  2802.       }
  2803.     }
  2805.     let kind = undefined;
  2806.     let accessibilityPurpose = null;
  2807.     if (type == shaka.util.ManifestParserUtils.ContentType.TEXT) {
  2808.       if (roles.includes('public.accessibility.transcribes-spoken-dialog') &&
  2809.           roles.includes('public.accessibility.describes-music-and-sound')) {
  2810.         kind = shaka.util.ManifestParserUtils.TextStreamKind.CLOSED_CAPTION;
  2811.       } else {
  2812.         kind = shaka.util.ManifestParserUtils.TextStreamKind.SUBTITLE;
  2813.       }
  2814.     } else {
  2815.       if (roles.includes('public.accessibility.describes-video')) {
  2816.         accessibilityPurpose =
  2817.               shaka.media.ManifestParser.AccessibilityPurpose.VISUALLY_IMPAIRED;
  2818.       }
  2819.     }
  2821.     // If there are no roles, and we have defaulted to the subtitle "kind" for
  2822.     // this track, add the implied subtitle role.
  2823.     if (!roles.length &&
  2824.         kind === shaka.util.ManifestParserUtils.TextStreamKind.SUBTITLE) {
  2825.       roles.push(shaka.util.ManifestParserUtils.TextStreamKind.SUBTITLE);
  2826.     }
  2828.     const stream = {
  2829.       id: this.globalId_++,
  2830.       originalId: name,
  2831.       groupId: null,
  2832.       createSegmentIndex: () => Promise.resolve(),
  2833.       segmentIndex: null,
  2834.       mimeType,
  2835.       codecs,
  2836.       kind: (type == shaka.util.ManifestParserUtils.ContentType.TEXT) ?
  2837.           shaka.util.ManifestParserUtils.TextStreamKind.SUBTITLE : undefined,
  2838.       encrypted: false,
  2839.       drmInfos: [],
  2840.       keyIds: new Set(),
  2841.       language: this.getLanguage_(languageValue),
  2842.       originalLanguage: languageValue,
  2843.       label: name,  // For historical reasons, since before "originalId".
  2844.       type,
  2845.       primary,
  2846.       // TODO: trick mode
  2847.       trickModeVideo: null,
  2848.       emsgSchemeIdUris: null,
  2849.       frameRate: undefined,
  2850.       pixelAspectRatio: undefined,
  2851.       width: undefined,
  2852.       height: undefined,
  2853.       bandwidth: undefined,
  2854.       roles,
  2855.       forced,
  2856.       channelsCount,
  2857.       audioSamplingRate: sampleRate,
  2858.       spatialAudio,
  2859.       closedCaptions,
  2860.       hdr: undefined,
  2861.       colorGamut: undefined,
  2862.       videoLayout: undefined,
  2863.       tilesLayout: undefined,
  2864.       accessibilityPurpose: accessibilityPurpose,
  2865.       external: false,
  2866.       fastSwitching: false,
  2867.       fullMimeTypes: new Set(),
  2868.     };
  2869.     this.setFullTypeForStream_(stream);
  2870.     return stream;
  2871.   }
  2873.   /**
  2874.    * @param {!shaka.hls.Playlist} playlist
  2875.    * @param {string} mimeType
  2876.    * @param {function():!Array.<string>} getUris
  2877.    * @param {?Map.<string, string>=} variables
  2878.    * @return {Promise.<{
  2879.    *   drmInfos: !Array.<shaka.extern.DrmInfo>,
  2880.    *   keyIds: !Set.<string>,
  2881.    *   encrypted: boolean,
  2882.    *   aesEncrypted: boolean
  2883.    * }>}
  2884.    * @private
  2885.    */
  2886.   async parseDrmInfo_(playlist, mimeType, getUris, variables) {
  2887.     /** @type {!Map<!shaka.hls.Tag, ?shaka.media.InitSegmentReference>} */
  2888.     const drmTagsMap = new Map();
  2889.     if (playlist.segments) {
  2890.       for (const segment of playlist.segments) {
  2891.         const segmentKeyTags = shaka.hls.Utils.filterTagsByName(segment.tags,
  2892.             'EXT-X-KEY');
  2893.         let initSegmentRef = null;
  2894.         if (segmentKeyTags.length) {
  2895.           initSegmentRef = this.getInitSegmentReference_(playlist,
  2896.               segment.tags, getUris, variables);
  2897.           for (const segmentKeyTag of segmentKeyTags) {
  2898.             drmTagsMap.set(segmentKeyTag, initSegmentRef);
  2899.           }
  2900.         }
  2901.       }
  2902.     }
  2904.     let encrypted = false;
  2905.     let aesEncrypted = false;
  2907.     /** @type {!Array.<shaka.extern.DrmInfo>}*/
  2908.     const drmInfos = [];
  2909.     const keyIds = new Set();
  2911.     for (const [key, value] of drmTagsMap) {
  2912.       const drmTag = /** @type {!shaka.hls.Tag} */ (key);
  2913.       const initSegmentRef =
  2914.       /** @type {?shaka.media.InitSegmentReference} */ (value);
  2915.       const method = drmTag.getRequiredAttrValue('METHOD');
  2916.       if (method != 'NONE') {
  2917.         encrypted = true;
  2919.         // According to the HLS spec, KEYFORMAT is optional and implicitly
  2920.         // defaults to "identity".
  2921.         // https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis-11#section-4.4.4.4
  2922.         const keyFormat =
  2923.             drmTag.getAttributeValue('KEYFORMAT') || 'identity';
  2924.         let drmInfo = null;
  2926.         if (this.isAesMethod_(method)) {
  2927.           // These keys are handled separately.
  2928.           aesEncrypted = true;
  2929.           continue;
  2930.         } else if (keyFormat == 'identity') {
  2931.           // eslint-disable-next-line no-await-in-loop
  2932.           drmInfo = await this.identityDrmParser_(
  2933.               drmTag, mimeType, getUris, initSegmentRef, variables);
  2934.         } else {
  2935.           const drmParser =
  2936.               shaka.hls.HlsParser.KEYFORMATS_TO_DRM_PARSERS_[keyFormat];
  2937.           drmInfo = drmParser ? drmParser(drmTag, mimeType) : null;
  2938.         }
  2939.         if (drmInfo) {
  2940.           if (drmInfo.keyIds) {
  2941.             for (const keyId of drmInfo.keyIds) {
  2942.               keyIds.add(keyId);
  2943.             }
  2944.           }
  2945.           drmInfos.push(drmInfo);
  2946.         } else {
  2947.           shaka.log.warning('Unsupported HLS KEYFORMAT', keyFormat);
  2948.         }
  2949.       }
  2950.     }
  2952.     return {drmInfos, keyIds, encrypted, aesEncrypted};
  2953.   }
  2955.   /**
  2956.    * @param {!shaka.hls.Tag} drmTag
  2957.    * @param {!shaka.hls.Playlist} playlist
  2958.    * @param {function():!Array.<string>} getUris
  2959.    * @param {?Map.<string, string>=} variables
  2960.    * @return {!shaka.extern.aesKey}
  2961.    * @private
  2962.    */
  2963.   parseAESDrmTag_(drmTag, playlist, getUris, variables) {
  2964.     // Check if the Web Crypto API is available.
  2965.     if (!window.crypto || !window.crypto.subtle) {
  2966.       shaka.log.alwaysWarn('Web Crypto API is not available to decrypt ' +
  2967.           'AES. (Web Crypto only exists in secure origins like https)');
  2968.       throw new shaka.util.Error(
  2969.           shaka.util.Error.Severity.CRITICAL,
  2970.           shaka.util.Error.Category.MANIFEST,
  2971.           shaka.util.Error.Code.NO_WEB_CRYPTO_API);
  2972.     }
  2974.     // HLS RFC 8216 Section 5.2:
  2975.     // An EXT-X-KEY tag with a KEYFORMAT of "identity" that does not have an IV
  2976.     // attribute indicates that the Media Sequence Number is to be used as the
  2977.     // IV when decrypting a Media Segment, by putting its big-endian binary
  2978.     // representation into a 16-octet (128-bit) buffer and padding (on the left)
  2979.     // with zeros.
  2980.     let firstMediaSequenceNumber = 0;
  2981.     let iv;
  2982.     const ivHex = drmTag.getAttributeValue('IV', '');
  2983.     if (!ivHex) {
  2984.       // Media Sequence Number will be used as IV.
  2985.       firstMediaSequenceNumber = shaka.hls.Utils.getFirstTagWithNameAsNumber(
  2986.           playlist.tags, 'EXT-X-MEDIA-SEQUENCE', 0);
  2987.     } else {
  2988.       // Exclude 0x at the start of string.
  2989.       iv = shaka.util.Uint8ArrayUtils.fromHex(ivHex.substr(2));
  2990.       if (iv.byteLength != 16) {
  2991.         throw new shaka.util.Error(
  2992.             shaka.util.Error.Severity.CRITICAL,
  2993.             shaka.util.Error.Category.MANIFEST,
  2994.             shaka.util.Error.Code.AES_128_INVALID_IV_LENGTH);
  2995.       }
  2996.     }
  2998.     const aesKeyInfoKey = `${drmTag.toString()}-${firstMediaSequenceNumber}`;
  2999.     if (!this.aesKeyInfoMap_.has(aesKeyInfoKey)) {
  3000.       // Default AES-128
  3001.       const keyInfo = {
  3002.         bitsKey: 128,
  3003.         blockCipherMode: 'CBC',
  3004.         iv,
  3005.         firstMediaSequenceNumber,
  3006.       };
  3008.       const method = drmTag.getRequiredAttrValue('METHOD');
  3009.       switch (method) {
  3010.         case 'AES-256':
  3011.           keyInfo.bitsKey = 256;
  3012.           break;
  3013.         case 'AES-256-CTR':
  3014.           keyInfo.bitsKey = 256;
  3015.           keyInfo.blockCipherMode = 'CTR';
  3016.           break;
  3017.       }
  3019.       // Don't download the key object until the segment is parsed, to avoid a
  3020.       // startup delay for long manifests with lots of keys.
  3021.       keyInfo.fetchKey = async () => {
  3022.         const keyUris = shaka.hls.Utils.constructSegmentUris(
  3023.             getUris(), drmTag.getRequiredAttrValue('URI'), variables);
  3025.         const keyMapKey = keyUris.sort().join('');
  3026.         if (!this.aesKeyMap_.has(keyMapKey)) {
  3027.           const requestType = shaka.net.NetworkingEngine.RequestType.KEY;
  3028.           const request = shaka.net.NetworkingEngine.makeRequest(
  3029.               keyUris, this.config_.retryParameters);
  3030.           const keyResponse = this.makeNetworkRequest_(request, requestType);
  3031.           this.aesKeyMap_.set(keyMapKey, keyResponse);
  3032.         }
  3033.         const keyResponse = await this.aesKeyMap_.get(keyMapKey);
  3035.         // keyResponse.status is undefined when URI is "data:text/plain;base64,"
  3036.         if (!keyResponse.data ||
  3037.             keyResponse.data.byteLength != (keyInfo.bitsKey / 8)) {
  3038.           throw new shaka.util.Error(
  3039.               shaka.util.Error.Severity.CRITICAL,
  3040.               shaka.util.Error.Category.MANIFEST,
  3041.               shaka.util.Error.Code.AES_128_INVALID_KEY_LENGTH);
  3042.         }
  3044.         const algorithm = {
  3045.           name: keyInfo.blockCipherMode == 'CTR' ? 'AES-CTR' : 'AES-CBC',
  3046.           length: keyInfo.bitsKey,
  3047.         };
  3048.         keyInfo.cryptoKey = await window.crypto.subtle.importKey(
  3049.             'raw', keyResponse.data, algorithm, true, ['decrypt']);
  3050.         keyInfo.fetchKey = undefined; // No longer needed.
  3051.       };
  3052.       this.aesKeyInfoMap_.set(aesKeyInfoKey, keyInfo);
  3053.     }
  3054.     return this.aesKeyInfoMap_.get(aesKeyInfoKey);
  3055.   }
  3058.   /**
  3059.    * @param {!shaka.hls.Playlist} playlist
  3060.    * @private
  3061.    */
  3062.   determinePresentationType_(playlist) {
  3063.     const PresentationType = shaka.hls.HlsParser.PresentationType_;
  3064.     const presentationTypeTag =
  3065.         shaka.hls.Utils.getFirstTagWithName(playlist.tags,
  3066.             'EXT-X-PLAYLIST-TYPE');
  3067.     const endListTag =
  3068.         shaka.hls.Utils.getFirstTagWithName(playlist.tags, 'EXT-X-ENDLIST');
  3070.     const isVod = (presentationTypeTag && presentationTypeTag.value == 'VOD') ||
  3071.         endListTag;
  3072.     const isEvent = presentationTypeTag &&
  3073.         presentationTypeTag.value == 'EVENT' && !isVod;
  3074.     const isLive = !isVod && !isEvent;
  3076.     if (isVod) {
  3077.       this.setPresentationType_(PresentationType.VOD);
  3078.     } else {
  3079.       // If it's not VOD, it must be presentation type LIVE or an ongoing EVENT.
  3080.       if (isLive) {
  3081.         this.setPresentationType_(PresentationType.LIVE);
  3082.       } else {
  3083.         this.setPresentationType_(PresentationType.EVENT);
  3084.       }
  3085.     }
  3086.   }
  3089.   /**
  3090.    * @param {!shaka.hls.Playlist} playlist
  3091.    * @private
  3092.    */
  3093.   determineLastTargetDuration_(playlist) {
  3094.     let lastTargetDuration = Infinity;
  3095.     const segments = playlist.segments;
  3096.     if (segments.length) {
  3097.       let segmentIndex = segments.length - 1;
  3098.       while (segmentIndex >= 0) {
  3099.         const segment = segments[segmentIndex];
  3100.         const extinfTag =
  3101.             shaka.hls.Utils.getFirstTagWithName(segment.tags, 'EXTINF');
  3102.         if (extinfTag) {
  3103.           // The EXTINF tag format is '#EXTINF:<duration>,[<title>]'.
  3104.           // We're interested in the duration part.
  3105.           const extinfValues = extinfTag.value.split(',');
  3106.           lastTargetDuration = Number(extinfValues[0]);
  3107.           break;
  3108.         }
  3109.         segmentIndex--;
  3110.       }
  3111.     }
  3113.     const targetDurationTag = this.getRequiredTag_(playlist.tags,
  3114.         'EXT-X-TARGETDURATION');
  3115.     const targetDuration = Number(targetDurationTag.value);
  3116.     const partialTargetDurationTag =
  3117.       shaka.hls.Utils.getFirstTagWithName(playlist.tags, 'EXT-X-PART-INF');
  3118.     if (partialTargetDurationTag) {
  3119.       this.partialTargetDuration_ = Number(
  3120.           partialTargetDurationTag.getRequiredAttrValue('PART-TARGET'));
  3121.     }
  3122.     // Get the server-recommended min distance from the live edge.
  3123.     const serverControlTag = shaka.hls.Utils.getFirstTagWithName(
  3124.         playlist.tags, 'EXT-X-SERVER-CONTROL');
  3125.     // According to the HLS spec, updates should not happen more often than
  3126.     // once in targetDuration.  It also requires us to only update the active
  3127.     // variant.  We might implement that later, but for now every variant
  3128.     // will be updated.  To get the update period, choose the smallest
  3129.     // targetDuration value across all playlists.
  3130.     // 1. Update the shortest one to use as update period and segment
  3131.     // availability time (for LIVE).
  3132.     if (this.lowLatencyMode_ && this.partialTargetDuration_) {
  3133.       // For low latency streaming, use the partial segment target duration.
  3134.       if (this.lowLatencyByterangeOptimization_) {
  3135.         // We always have at least 1 partial segment part, and most servers
  3136.         // allow you to make a request with _HLS_msn=X&_HLS_part=0 with a
  3137.         // distance of 4 partial segments.  With this we ensure that we
  3138.         // obtain the minimum latency in this type of case.
  3139.         if (this.partialTargetDuration_ * 5 <= lastTargetDuration) {
  3140.           this.lastTargetDuration_ = Math.min(
  3141.               this.partialTargetDuration_, this.lastTargetDuration_);
  3142.         } else {
  3143.           this.lastTargetDuration_ = Math.min(
  3144.               lastTargetDuration, this.lastTargetDuration_);
  3145.         }
  3146.       } else {
  3147.         this.lastTargetDuration_ = Math.min(
  3148.             this.partialTargetDuration_, this.lastTargetDuration_);
  3149.       }
  3150.       // Use 'PART-HOLD-BACK' as the presentation delay for low latency mode.
  3151.       this.lowLatencyPresentationDelay_ = serverControlTag ? Number(
  3152.           serverControlTag.getRequiredAttrValue('PART-HOLD-BACK')) : 0;
  3153.     } else {
  3154.       this.lastTargetDuration_ = Math.min(
  3155.           lastTargetDuration, this.lastTargetDuration_);
  3156.       // Use 'HOLD-BACK' as the presentation delay for default if defined.
  3157.       const holdBack = serverControlTag ?
  3158.           serverControlTag.getAttribute('HOLD-BACK') : null;
  3159.       this.presentationDelay_ = holdBack ? Number(holdBack.value) : 0;
  3160.     }
  3161.     // 2. Update the longest target duration if need be to use as a
  3162.     // presentation delay later.
  3163.     this.maxTargetDuration_ = Math.max(
  3164.         targetDuration, this.maxTargetDuration_);
  3165.   }
  3168.   /**
  3169.    * @param {!shaka.hls.Playlist} playlist
  3170.    * @private
  3171.    */
  3172.   changePresentationTimelineToLive_(playlist) {
  3173.     // The live edge will be calculated from segments, so we don't need to
  3174.     // set a presentation start time.  We will assert later that this is
  3175.     // working as expected.
  3177.     // The HLS spec (RFC 8216) states in 6.3.3:
  3178.     //
  3179.     // "The client SHALL choose which Media Segment to play first ... the
  3180.     // client SHOULD NOT choose a segment that starts less than three target
  3181.     // durations from the end of the Playlist file.  Doing so can trigger
  3182.     // playback stalls."
  3183.     //
  3184.     // We accomplish this in our DASH-y model by setting a presentation
  3185.     // delay of configured value, or 3 segments duration if not configured.
  3186.     // This will be the "live edge" of the presentation.
  3187.     let presentationDelay;
  3188.     if (this.config_.defaultPresentationDelay) {
  3189.       presentationDelay = this.config_.defaultPresentationDelay;
  3190.     } else if (this.lowLatencyPresentationDelay_) {
  3191.       presentationDelay = this.lowLatencyPresentationDelay_;
  3192.     } else if (this.presentationDelay_) {
  3193.       presentationDelay = this.presentationDelay_;
  3194.     } else {
  3195.       const playlistSegments = playlist.segments.length;
  3196.       let delaySegments = this.config_.hls.liveSegmentsDelay;
  3197.       if (delaySegments > (playlistSegments - 2)) {
  3198.         delaySegments = Math.max(1, playlistSegments - 2);
  3199.       }
  3200.       presentationDelay = this.maxTargetDuration_ * delaySegments;
  3201.     }
  3203.     this.presentationTimeline_.setPresentationStartTime(0);
  3204.     this.presentationTimeline_.setDelay(presentationDelay);
  3205.     this.presentationTimeline_.setStatic(false);
  3206.   }
  3208.   /**
  3209.    * Get the InitSegmentReference for a segment if it has a EXT-X-MAP tag.
  3210.    * @param {!shaka.hls.Playlist} playlist
  3211.    * @param {!Array.<!shaka.hls.Tag>} tags Segment tags
  3212.    * @param {function():!Array.<string>} getUris
  3213.    * @param {?Map.<string, string>=} variables
  3214.    * @return {shaka.media.InitSegmentReference}
  3215.    * @private
  3216.    */
  3217.   getInitSegmentReference_(playlist, tags, getUris, variables) {
  3218.     /** @type {?shaka.hls.Tag} */
  3219.     const mapTag = shaka.hls.Utils.getFirstTagWithName(tags, 'EXT-X-MAP');
  3221.     if (!mapTag) {
  3222.       return null;
  3223.     }
  3224.     // Map tag example: #EXT-X-MAP:URI="main.mp4",BYTERANGE="720@0"
  3225.     const verbatimInitSegmentUri = mapTag.getRequiredAttrValue('URI');
  3226.     const absoluteInitSegmentUris = shaka.hls.Utils.constructSegmentUris(
  3227.         getUris(), verbatimInitSegmentUri, variables);
  3229.     const mapTagKey = [
  3230.       absoluteInitSegmentUris.toString(),
  3231.       mapTag.getAttributeValue('BYTERANGE', ''),
  3232.     ].join('-');
  3233.     if (!this.mapTagToInitSegmentRefMap_.has(mapTagKey)) {
  3234.       /** @type {shaka.extern.aesKey|undefined} */
  3235.       let aesKey = undefined;
  3236.       let byteRangeTag = null;
  3237.       for (const tag of tags) {
  3238.         if (tag.name == 'EXT-X-KEY') {
  3239.           if (this.isAesMethod_(tag.getRequiredAttrValue('METHOD')) &&
  3240.               tag.id < mapTag.id) {
  3241.             aesKey =
  3242.                 this.parseAESDrmTag_(tag, playlist, getUris, variables);
  3243.           }
  3244.         } else if (tag.name == 'EXT-X-BYTERANGE' && tag.id < mapTag.id) {
  3245.           byteRangeTag = tag;
  3246.         }
  3247.       }
  3248.       const initSegmentRef = this.createInitSegmentReference_(
  3249.           absoluteInitSegmentUris, mapTag, byteRangeTag, aesKey);
  3250.       this.mapTagToInitSegmentRefMap_.set(mapTagKey, initSegmentRef);
  3251.     }
  3252.     return this.mapTagToInitSegmentRefMap_.get(mapTagKey);
  3253.   }
  3255.   /**
  3256.    * Create an InitSegmentReference object for the EXT-X-MAP tag in the media
  3257.    * playlist.
  3258.    * @param {!Array.<string>} absoluteInitSegmentUris
  3259.    * @param {!shaka.hls.Tag} mapTag EXT-X-MAP
  3260.    * @param {shaka.hls.Tag=} byteRangeTag EXT-X-BYTERANGE
  3261.    * @param {shaka.extern.aesKey=} aesKey
  3262.    * @return {!shaka.media.InitSegmentReference}
  3263.    * @private
  3264.    */
  3265.   createInitSegmentReference_(absoluteInitSegmentUris, mapTag, byteRangeTag,
  3266.       aesKey) {
  3267.     let startByte = 0;
  3268.     let endByte = null;
  3269.     let byterange = mapTag.getAttributeValue('BYTERANGE');
  3270.     if (!byterange && byteRangeTag) {
  3271.       byterange = byteRangeTag.value;
  3272.     }
  3273.     // If a BYTERANGE attribute is not specified, the segment consists
  3274.     // of the entire resource.
  3275.     if (byterange) {
  3276.       const blocks = byterange.split('@');
  3277.       const byteLength = Number(blocks[0]);
  3278.       startByte = Number(blocks[1]);
  3279.       endByte = startByte + byteLength - 1;
  3281.       if (aesKey) {
  3282.         // MAP segment encrypted with method AES, when served with
  3283.         // HTTP Range, has the unencrypted size specified in the range.
  3284.         // See: https://tools.ietf.org/html/draft-pantos-hls-rfc8216bis-08#section-6.3.6
  3285.         const length = (endByte + 1) - startByte;
  3286.         if (length % 16) {
  3287.           endByte += (16 - (length % 16));
  3288.         }
  3289.       }
  3290.     }
  3292.     const initSegmentRef = new shaka.media.InitSegmentReference(
  3293.         () => absoluteInitSegmentUris,
  3294.         startByte,
  3295.         endByte,
  3296.         /* mediaQuality= */ null,
  3297.         /* timescale= */ null,
  3298.         /* segmentData= */ null,
  3299.         aesKey);
  3300.     return initSegmentRef;
  3301.   }
  3303.   /**
  3304.    * Parses one shaka.hls.Segment object into a shaka.media.SegmentReference.
  3305.    *
  3306.    * @param {shaka.media.InitSegmentReference} initSegmentReference
  3307.    * @param {shaka.media.SegmentReference} previousReference
  3308.    * @param {!shaka.hls.Segment} hlsSegment
  3309.    * @param {number} startTime
  3310.    * @param {!Map.<string, string>} variables
  3311.    * @param {!shaka.hls.Playlist} playlist
  3312.    * @param {string} type
  3313.    * @param {function():!Array.<string>} getUris
  3314.    * @param {shaka.extern.aesKey=} aesKey
  3315.    * @return {shaka.media.SegmentReference}
  3316.    * @private
  3317.    */
  3318.   createSegmentReference_(
  3319.       initSegmentReference, previousReference, hlsSegment, startTime,
  3320.       variables, playlist, type, getUris, aesKey) {
  3321.     const tags = hlsSegment.tags;
  3322.     const extinfTag =
  3323.         shaka.hls.Utils.getFirstTagWithName(tags, 'EXTINF');
  3325.     let endTime = 0;
  3326.     let startByte = 0;
  3327.     let endByte = null;
  3329.     if (hlsSegment.partialSegments.length && !this.lowLatencyMode_) {
  3330.       shaka.log.alwaysWarn('Low-latency HLS live stream detected, but ' +
  3331.                 'low-latency streaming mode is not enabled in Shaka ' +
  3332.                 'Player. Set streaming.lowLatencyMode configuration to ' +
  3333.                 'true, and see https://bit.ly/3clctcj for details.');
  3334.     }
  3336.     let syncTime = null;
  3337.     if (!this.config_.hls.ignoreManifestProgramDateTime) {
  3338.       const dateTimeTag =
  3339.           shaka.hls.Utils.getFirstTagWithName(tags, 'EXT-X-PROGRAM-DATE-TIME');
  3340.       if (dateTimeTag && dateTimeTag.value) {
  3341.         syncTime = shaka.util.TXml.parseDate(dateTimeTag.value);
  3342.         goog.asserts.assert(syncTime != null,
  3343.             'EXT-X-PROGRAM-DATE-TIME format not valid');
  3344.       }
  3345.     }
  3347.     let status = shaka.media.SegmentReference.Status.AVAILABLE;
  3348.     if (shaka.hls.Utils.getFirstTagWithName(tags, 'EXT-X-GAP')) {
  3349.       status = shaka.media.SegmentReference.Status.MISSING;
  3350.     }
  3352.     if (!extinfTag) {
  3353.       if (hlsSegment.partialSegments.length == 0) {
  3354.         // EXTINF tag must be available if the segment has no partial segments.
  3355.         throw new shaka.util.Error(
  3356.             shaka.util.Error.Severity.CRITICAL,
  3357.             shaka.util.Error.Category.MANIFEST,
  3358.             shaka.util.Error.Code.HLS_REQUIRED_TAG_MISSING, 'EXTINF');
  3359.       } else if (!this.lowLatencyMode_) {
  3360.         // Without EXTINF and without low-latency mode, partial segments get
  3361.         // ignored.
  3362.         return null;
  3363.       }
  3364.     }
  3366.     // Create SegmentReferences for the partial segments.
  3367.     let partialSegmentRefs = [];
  3369.     // Optimization for LL-HLS with byterange
  3370.     // More info in https://tinyurl.com/hls-open-byte-range
  3371.     let segmentWithByteRangeOptimization = false;
  3372.     let getUrisOptimization = null;
  3373.     let somePartialSegmentWithGap = false;
  3374.     let isPreloadSegment = false;
  3376.     if (this.lowLatencyMode_ && hlsSegment.partialSegments.length) {
  3377.       const byterangeOptimizationSupport =
  3378.           initSegmentReference && window.ReadableStream &&
  3379.           this.config_.hls.allowLowLatencyByteRangeOptimization;
  3381.       let partialSyncTime = syncTime;
  3382.       for (let i = 0; i < hlsSegment.partialSegments.length; i++) {
  3383.         const item = hlsSegment.partialSegments[i];
  3384.         const pPreviousReference = i == 0 ?
  3385.           previousReference : partialSegmentRefs[partialSegmentRefs.length - 1];
  3386.         const pStartTime = (i == 0) ? startTime : pPreviousReference.endTime;
  3388.         // If DURATION is missing from this partial segment, use the target
  3389.         // partial duration from the top of the playlist, which is a required
  3390.         // attribute for content with partial segments.
  3391.         const pDuration = Number(item.getAttributeValue('DURATION')) ||
  3392.             this.partialTargetDuration_;
  3394.         // If for some reason we have neither an explicit duration, nor a target
  3395.         // partial duration, we should SKIP this partial segment to avoid
  3396.         // duplicating content in the presentation timeline.
  3397.         if (!pDuration) {
  3398.           continue;
  3399.         }
  3401.         const pEndTime = pStartTime + pDuration;
  3403.         let pStartByte = 0;
  3404.         let pEndByte = null;
  3405.         if (item.name == 'EXT-X-PRELOAD-HINT') {
  3406.           // A preload hinted partial segment may have byterange start info.
  3407.           const pByterangeStart = item.getAttributeValue('BYTERANGE-START');
  3408.           pStartByte = pByterangeStart ? Number(pByterangeStart) : 0;
  3409.           // A preload hinted partial segment may have byterange length info.
  3410.           const pByterangeLength = item.getAttributeValue('BYTERANGE-LENGTH');
  3411.           if (pByterangeLength) {
  3412.             pEndByte = pStartByte + Number(pByterangeLength) - 1;
  3413.           } else if (pStartByte) {
  3414.             // If we have a non-zero start byte, but no end byte, follow the
  3415.             // recommendation of https://tinyurl.com/hls-open-byte-range and
  3416.             // set the end byte explicitly to a large integer.
  3417.             pEndByte = Number.MAX_SAFE_INTEGER;
  3418.           }
  3419.         } else {
  3420.           const pByterange = item.getAttributeValue('BYTERANGE');
  3421.           [pStartByte, pEndByte] =
  3422.             this.parseByteRange_(pPreviousReference, pByterange);
  3423.         }
  3424.         const pUri = item.getAttributeValue('URI');
  3425.         if (!pUri) {
  3426.           continue;
  3427.         }
  3429.         let partialStatus = shaka.media.SegmentReference.Status.AVAILABLE;
  3430.         if (item.getAttributeValue('GAP') == 'YES') {
  3431.           partialStatus = shaka.media.SegmentReference.Status.MISSING;
  3432.           somePartialSegmentWithGap = true;
  3433.         }
  3435.         let uris = null;
  3436.         const getPartialUris = () => {
  3437.           if (uris == null) {
  3438.             goog.asserts.assert(pUri, 'Partial uri should be defined!');
  3439.             uris = shaka.hls.Utils.constructSegmentUris(
  3440.                 getUris(), pUri, variables);
  3441.           }
  3442.           return uris;
  3443.         };
  3445.         if (byterangeOptimizationSupport &&
  3446.             pStartByte >= 0 && pEndByte != null) {
  3447.           getUrisOptimization = getPartialUris;
  3448.           segmentWithByteRangeOptimization = true;
  3449.         }
  3451.         const partial = new shaka.media.SegmentReference(
  3452.             pStartTime,
  3453.             pEndTime,
  3454.             getPartialUris,
  3455.             pStartByte,
  3456.             pEndByte,
  3457.             initSegmentReference,
  3458.             /* timestampOffset= */ 0,
  3459.             /* appendWindowStart= */ 0,
  3460.             /* appendWindowEnd= */ Infinity,
  3461.             /* partialReferences= */ [],
  3462.             /* tilesLayout= */ '',
  3463.             /* tileDuration= */ null,
  3464.             partialSyncTime,
  3465.             partialStatus,
  3466.             aesKey);
  3467.         if (item.name == 'EXT-X-PRELOAD-HINT') {
  3468.           partial.markAsPreload();
  3469.           isPreloadSegment = true;
  3470.         }
  3471.         // The spec doesn't say that we can assume INDEPENDENT=YES for the
  3472.         // first partial segment. It does call the flag "optional", though, and
  3473.         // that cases where there are no such flags on any partial segments, it
  3474.         // is sensible to assume the first one is independent.
  3475.         if (item.getAttributeValue('INDEPENDENT') != 'YES' && i > 0) {
  3476.           partial.markAsNonIndependent();
  3477.         }
  3478.         partialSegmentRefs.push(partial);
  3480.         if (partialSyncTime) {
  3481.           partialSyncTime += pDuration;
  3482.         }
  3483.       } // for-loop of hlsSegment.partialSegments
  3484.     }
  3486.     // If the segment has EXTINF tag, set the segment's end time, start byte
  3487.     // and end byte based on the duration and byterange information.
  3488.     // Otherwise, calculate the end time, start / end byte based on its partial
  3489.     // segments.
  3490.     // Note that the sum of partial segments durations may be slightly different
  3491.     // from the parent segment's duration. In this case, use the duration from
  3492.     // the parent segment tag.
  3493.     if (extinfTag) {
  3494.       // The EXTINF tag format is '#EXTINF:<duration>,[<title>]'.
  3495.       // We're interested in the duration part.
  3496.       const extinfValues = extinfTag.value.split(',');
  3497.       const duration = Number(extinfValues[0]);
  3498.       // Skip segments without duration
  3499.       if (duration == 0) {
  3500.         return null;
  3501.       }
  3502.       endTime = startTime + duration;
  3503.     } else if (partialSegmentRefs.length) {
  3504.       endTime = partialSegmentRefs[partialSegmentRefs.length - 1].endTime;
  3505.     } else {
  3506.       // Skip segments without duration and without partialsegments
  3507.       return null;
  3508.     }
  3510.     if (segmentWithByteRangeOptimization) {
  3511.       // We cannot optimize segments with gaps, or with a start byte that is
  3512.       // not 0.
  3513.       if (somePartialSegmentWithGap || partialSegmentRefs[0].startByte != 0) {
  3514.         segmentWithByteRangeOptimization = false;
  3515.         getUrisOptimization = null;
  3516.       } else {
  3517.         partialSegmentRefs = [];
  3518.       }
  3519.     }
  3521.     // If the segment has EXT-X-BYTERANGE tag, set the start byte and end byte
  3522.     // base on the byterange information. If segment has no EXT-X-BYTERANGE tag
  3523.     // and has partial segments, set the start byte and end byte base on the
  3524.     // partial segments.
  3525.     const byterangeTag =
  3526.          shaka.hls.Utils.getFirstTagWithName(tags, 'EXT-X-BYTERANGE');
  3527.     if (byterangeTag) {
  3528.       [startByte, endByte] =
  3529.           this.parseByteRange_(previousReference, byterangeTag.value);
  3530.     } else if (partialSegmentRefs.length) {
  3531.       startByte = partialSegmentRefs[0].startByte;
  3532.       endByte = partialSegmentRefs[partialSegmentRefs.length - 1].endByte;
  3533.     }
  3535.     let tilesLayout = '';
  3536.     let tileDuration = null;
  3537.     if (type == shaka.util.ManifestParserUtils.ContentType.IMAGE) {
  3538.       // By default in HLS the tilesLayout is 1x1
  3539.       tilesLayout = '1x1';
  3540.       const tilesTag =
  3541.           shaka.hls.Utils.getFirstTagWithName(tags, 'EXT-X-TILES');
  3542.       if (tilesTag) {
  3543.         tilesLayout = tilesTag.getRequiredAttrValue('LAYOUT');
  3544.         const duration = tilesTag.getAttributeValue('DURATION');
  3545.         if (duration) {
  3546.           tileDuration = Number(duration);
  3547.         }
  3548.       }
  3549.     }
  3551.     let uris = null;
  3552.     const getSegmentUris = () => {
  3553.       if (getUrisOptimization) {
  3554.         return getUrisOptimization();
  3555.       }
  3556.       if (uris == null) {
  3557.         uris = shaka.hls.Utils.constructSegmentUris(getUris(),
  3558.             hlsSegment.verbatimSegmentUri, variables);
  3559.       }
  3560.       return uris || [];
  3561.     };
  3563.     const allPartialSegments = partialSegmentRefs.length > 0 &&
  3564.         !!hlsSegment.verbatimSegmentUri;
  3566.     const reference = new shaka.media.SegmentReference(
  3567.         startTime,
  3568.         endTime,
  3569.         getSegmentUris,
  3570.         startByte,
  3571.         endByte,
  3572.         initSegmentReference,
  3573.         /* timestampOffset= */ 0,
  3574.         /* appendWindowStart= */ 0,
  3575.         /* appendWindowEnd= */ Infinity,
  3576.         partialSegmentRefs,
  3577.         tilesLayout,
  3578.         tileDuration,
  3579.         syncTime,
  3580.         status,
  3581.         aesKey,
  3582.         allPartialSegments,
  3583.     );
  3585.     if (segmentWithByteRangeOptimization) {
  3586.       this.lowLatencyByterangeOptimization_ = true;
  3587.       reference.markAsByterangeOptimization();
  3589.       if (isPreloadSegment) {
  3590.         reference.markAsPreload();
  3591.       }
  3592.     }
  3594.     return reference;
  3595.   }
  3598.   /**
  3599.    * Parse the startByte and endByte.
  3600.    * @param {shaka.media.SegmentReference} previousReference
  3601.    * @param {?string} byterange
  3602.    * @return {!Array.<number>} An array with the start byte and end byte.
  3603.    * @private
  3604.    */
  3605.   parseByteRange_(previousReference, byterange) {
  3606.     let startByte = 0;
  3607.     let endByte = null;
  3608.     // If BYTERANGE is not specified, the segment consists of the entire
  3609.     // resource.
  3610.     if (byterange) {
  3611.       const blocks = byterange.split('@');
  3612.       const byteLength = Number(blocks[0]);
  3613.       if (blocks[1]) {
  3614.         startByte = Number(blocks[1]);
  3615.       } else {
  3616.         goog.asserts.assert(previousReference,
  3617.             'Cannot refer back to previous HLS segment!');
  3618.         startByte = previousReference.endByte + 1;
  3619.       }
  3620.       endByte = startByte + byteLength - 1;
  3621.     }
  3622.     return [startByte, endByte];
  3623.   }
  3625.   /**
  3626.    * Parses shaka.hls.Segment objects into shaka.media.SegmentReferences and
  3627.    * get the bandwidth necessary for this segments If it's defined in the
  3628.    * playlist.
  3629.    *
  3630.    * @param {!shaka.hls.Playlist} playlist
  3631.    * @param {!Map.<number, number>} mediaSequenceToStartTime
  3632.    * @param {!Map.<string, string>} variables
  3633.    * @param {function():!Array.<string>} getUris
  3634.    * @param {string} type
  3635.    * @return {{segments: !Array.<!shaka.media.SegmentReference>,
  3636.    *          bandwidth: (number|undefined)}}
  3637.    * @private
  3638.    */
  3639.   createSegments_(playlist, mediaSequenceToStartTime, variables,
  3640.       getUris, type) {
  3641.     /** @type {Array.<!shaka.hls.Segment>} */
  3642.     const hlsSegments = playlist.segments;
  3643.     goog.asserts.assert(hlsSegments.length, 'Playlist should have segments!');
  3645.     /** @type {shaka.media.InitSegmentReference} */
  3646.     let initSegmentRef;
  3648.     /** @type {shaka.extern.aesKey|undefined} */
  3649.     let aesKey = undefined;
  3651.     let discontinuitySequence = shaka.hls.Utils.getFirstTagWithNameAsNumber(
  3652.         playlist.tags, 'EXT-X-DISCONTINUITY-SEQUENCE', 0);
  3653.     const mediaSequenceNumber = shaka.hls.Utils.getFirstTagWithNameAsNumber(
  3654.         playlist.tags, 'EXT-X-MEDIA-SEQUENCE', 0);
  3655.     const skipTag = shaka.hls.Utils.getFirstTagWithName(
  3656.         playlist.tags, 'EXT-X-SKIP');
  3657.     const skippedSegments =
  3658.         skipTag ? Number(skipTag.getAttributeValue('SKIPPED-SEGMENTS')) : 0;
  3659.     let position = mediaSequenceNumber + skippedSegments;
  3660.     let firstStartTime = 0;
  3662.     // For live stream, use the cached value in the mediaSequenceToStartTime
  3663.     // map if available.
  3664.     if (this.isLive_() && mediaSequenceToStartTime.has(position)) {
  3665.       firstStartTime = mediaSequenceToStartTime.get(position);
  3666.     }
  3667.     // This is for recovering from disconnects.
  3668.     if (firstStartTime === 0 &&
  3669.         this.presentationType_ == shaka.hls.HlsParser.PresentationType_.LIVE &&
  3670.         mediaSequenceToStartTime.size > 0 &&
  3671.         !mediaSequenceToStartTime.has(position)) {
  3672.       firstStartTime = this.presentationTimeline_.getSegmentAvailabilityStart();
  3673.     }
  3675.     /** @type {!Array.<!shaka.media.SegmentReference>} */
  3676.     const references = [];
  3678.     let previousReference = null;
  3680.     /** @type {!Array.<{bitrate: number, duration: number}>} */
  3681.     const bitrates = [];
  3683.     for (let i = 0; i < hlsSegments.length; i++) {
  3684.       const item = hlsSegments[i];
  3685.       const startTime =
  3686.           (i == 0) ? firstStartTime : previousReference.endTime;
  3687.       position = mediaSequenceNumber + skippedSegments + i;
  3689.       const discontinuityTag = shaka.hls.Utils.getFirstTagWithName(
  3690.           item.tags, 'EXT-X-DISCONTINUITY');
  3691.       if (discontinuityTag) {
  3692.         discontinuitySequence++;
  3693.       }
  3695.       // Apply new AES tags as you see them, keeping a running total.
  3696.       for (const drmTag of item.tags) {
  3697.         if (drmTag.name == 'EXT-X-KEY') {
  3698.           if (this.isAesMethod_(drmTag.getRequiredAttrValue('METHOD'))) {
  3699.             aesKey =
  3700.                 this.parseAESDrmTag_(drmTag, playlist, getUris, variables);
  3701.           } else {
  3702.             aesKey = undefined;
  3703.           }
  3704.         }
  3705.       }
  3707.       mediaSequenceToStartTime.set(position, startTime);
  3709.       initSegmentRef = this.getInitSegmentReference_(playlist,
  3710.           item.tags, getUris, variables);
  3712.       // If the stream is low latency and the user has not configured the
  3713.       // lowLatencyMode, but if it has been configured to activate the
  3714.       // lowLatencyMode if a stream of this type is detected, we automatically
  3715.       // activate the lowLatencyMode.
  3716.       if (!this.lowLatencyMode_) {
  3717.         const autoLowLatencyMode = this.playerInterface_.isAutoLowLatencyMode();
  3718.         if (autoLowLatencyMode) {
  3719.           this.playerInterface_.enableLowLatencyMode();
  3720.           this.lowLatencyMode_ = this.playerInterface_.isLowLatencyMode();
  3721.         }
  3722.       }
  3724.       const reference = this.createSegmentReference_(
  3725.           initSegmentRef,
  3726.           previousReference,
  3727.           item,
  3728.           startTime,
  3729.           variables,
  3730.           playlist,
  3731.           type,
  3732.           getUris,
  3733.           aesKey);
  3735.       if (reference) {
  3736.         const bitrate = shaka.hls.Utils.getFirstTagWithNameAsNumber(
  3737.             item.tags, 'EXT-X-BITRATE');
  3738.         if (bitrate) {
  3739.           bitrates.push({
  3740.             bitrate,
  3741.             duration: reference.endTime - reference.startTime,
  3742.           });
  3743.         } else if (bitrates.length) {
  3744.           // It applies to every segment between it and the next EXT-X-BITRATE,
  3745.           // so we use the latest bitrate value
  3746.           const prevBitrate = bitrates.pop();
  3747.           prevBitrate.duration += reference.endTime - reference.startTime;
  3748.           bitrates.push(prevBitrate);
  3749.         }
  3751.         previousReference = reference;
  3752.         reference.discontinuitySequence = discontinuitySequence;
  3754.         if (this.ignoreManifestProgramDateTimeFor_(type) &&
  3755.             this.minSequenceNumber_ != null &&
  3756.             position < this.minSequenceNumber_) {
  3757.           // This segment is ignored as part of our fallback synchronization
  3758.           // method.
  3759.         } else {
  3760.           references.push(reference);
  3761.         }
  3762.       }
  3763.     }
  3765.     let bandwidth = undefined;
  3766.     if (bitrates.length) {
  3767.       const duration = bitrates.reduce((sum, value) => {
  3768.         return sum + value.duration;
  3769.       }, 0);
  3770.       bandwidth = Math.round(bitrates.reduce((sum, value) => {
  3771.         return sum + value.bitrate * value.duration;
  3772.       }, 0) / duration * 1000);
  3773.     }
  3775.     // If some segments have sync times, but not all, extrapolate the sync
  3776.     // times of the ones with none.
  3777.     const someSyncTime = references.some((ref) => ref.syncTime != null);
  3778.     if (someSyncTime) {
  3779.       for (let i = 0; i < references.length; i++) {
  3780.         const reference = references[i];
  3781.         if (reference.syncTime != null) {
  3782.           // No need to extrapolate.
  3783.           continue;
  3784.         }
  3785.         // Find the nearest segment with syncTime, in either direction.
  3786.         // This looks forward and backward simultaneously, keeping track of what
  3787.         // to offset the syncTime it finds by as it goes.
  3788.         let forwardAdd = 0;
  3789.         let forwardI = i;
  3790.         /**
  3791.          * Look forwards one reference at a time, summing all durations as we
  3792.          * go, until we find a reference with a syncTime to use as a basis.
  3793.          * This DOES count the original reference, but DOESN'T count the first
  3794.          * reference with a syncTime (as we approach it from behind).
  3795.          * @return {?number}
  3796.          */
  3797.         const lookForward = () => {
  3798.           const other = references[forwardI];
  3799.           if (other) {
  3800.             if (other.syncTime != null) {
  3801.               return other.syncTime + forwardAdd;
  3802.             }
  3803.             forwardAdd -= other.endTime - other.startTime;
  3804.             forwardI += 1;
  3805.           }
  3806.           return null;
  3807.         };
  3808.         let backwardAdd = 0;
  3809.         let backwardI = i;
  3810.         /**
  3811.          * Look backwards one reference at a time, summing all durations as we
  3812.          * go, until we find a reference with a syncTime to use as a basis.
  3813.          * This DOESN'T count the original reference, but DOES count the first
  3814.          * reference with a syncTime (as we approach it from ahead).
  3815.          * @return {?number}
  3816.          */
  3817.         const lookBackward = () => {
  3818.           const other = references[backwardI];
  3819.           if (other) {
  3820.             if (other != reference) {
  3821.               backwardAdd += other.endTime - other.startTime;
  3822.             }
  3823.             if (other.syncTime != null) {
  3824.               return other.syncTime + backwardAdd;
  3825.             }
  3826.             backwardI -= 1;
  3827.           }
  3828.           return null;
  3829.         };
  3830.         while (reference.syncTime == null) {
  3831.           reference.syncTime = lookBackward();
  3832.           if (reference.syncTime == null) {
  3833.             reference.syncTime = lookForward();
  3834.           }
  3835.         }
  3836.       }
  3837.     }
  3839.     // Split the sync times properly among partial segments.
  3840.     if (someSyncTime) {
  3841.       for (const reference of references) {
  3842.         let syncTime = reference.syncTime;
  3843.         for (const partial of reference.partialReferences) {
  3844.           partial.syncTime = syncTime;
  3845.           syncTime += partial.endTime - partial.startTime;
  3846.         }
  3847.       }
  3848.     }
  3850.     // lowestSyncTime is a value from a previous playlist update.  Use it to
  3851.     // set reference start times.  If this is the first playlist parse, we will
  3852.     // skip this step, and wait until we have sync time across stream types.
  3853.     const lowestSyncTime = this.lowestSyncTime_;
  3854.     if (someSyncTime && lowestSyncTime != Infinity) {
  3855.       if (!this.ignoreManifestProgramDateTimeFor_(type)) {
  3856.         for (const reference of references) {
  3857.           reference.syncAgainst(lowestSyncTime);
  3858.         }
  3859.       }
  3860.     }
  3862.     return {
  3863.       segments: references,
  3864.       bandwidth,
  3865.     };
  3866.   }
  3868.   /**
  3869.    * Attempts to guess stream's mime type based on content type and URI.
  3870.    *
  3871.    * @param {string} contentType
  3872.    * @param {string} codecs
  3873.    * @return {?string}
  3874.    * @private
  3875.    */
  3876.   guessMimeTypeBeforeLoading_(contentType, codecs) {
  3877.     if (contentType == shaka.util.ManifestParserUtils.ContentType.TEXT) {
  3878.       if (codecs == 'vtt' || codecs == 'wvtt') {
  3879.         // If codecs is 'vtt', it's WebVTT.
  3880.         return 'text/vtt';
  3881.       } else if (codecs && codecs !== '') {
  3882.         // Otherwise, assume MP4-embedded text, since text-based formats tend
  3883.         // not to have a codecs string at all.
  3884.         return 'application/mp4';
  3885.       }
  3886.     }
  3888.     if (contentType == shaka.util.ManifestParserUtils.ContentType.IMAGE) {
  3889.       if (!codecs || codecs == 'jpeg') {
  3890.         return 'image/jpeg';
  3891.       }
  3892.     }
  3894.     if (contentType == shaka.util.ManifestParserUtils.ContentType.AUDIO) {
  3895.       // See: https://bugs.chromium.org/p/chromium/issues/detail?id=489520
  3896.       if (codecs == 'mp4a.40.34') {
  3897.         return 'audio/mpeg';
  3898.       }
  3899.     }
  3901.     if (codecs == 'mjpg') {
  3902.       return 'application/mp4';
  3903.     }
  3905.     // Not enough information to guess from the content type and codecs.
  3906.     return null;
  3907.   }
  3909.   /**
  3910.    * Get a fallback mime type for the content. Used if all the better methods
  3911.    * for determining the mime type have failed.
  3912.    *
  3913.    * @param {string} contentType
  3914.    * @return {string}
  3915.    * @private
  3916.    */
  3917.   guessMimeTypeFallback_(contentType) {
  3918.     if (contentType == shaka.util.ManifestParserUtils.ContentType.TEXT) {
  3919.       // If there was no codecs string and no content-type, assume HLS text
  3920.       // streams are WebVTT.
  3921.       return 'text/vtt';
  3922.     }
  3923.     // If the HLS content is lacking in both MIME type metadata and
  3924.     // segment file extensions, we fall back to assuming it's MP4.
  3925.     const map = shaka.hls.HlsParser.EXTENSION_MAP_BY_CONTENT_TYPE_[contentType];
  3926.     return map['mp4'];
  3927.   }
  3929.   /**
  3930.    * Attempts to guess stream's mime type.
  3931.    *
  3932.    * @param {string} contentType
  3933.    * @param {string} codecs
  3934.    * @param {!Array.<!shaka.media.SegmentReference>} segments
  3935.    * @return {!Promise.<string>}
  3936.    * @private
  3937.    */
  3938.   async guessMimeType_(contentType, codecs, segments) {
  3939.     const HlsParser = shaka.hls.HlsParser;
  3940.     const requestType = shaka.net.NetworkingEngine.RequestType.SEGMENT;
  3942.     // If you wait long enough, requesting the first segment can fail
  3943.     // because it has fallen off the left edge of DVR, so to be safer,
  3944.     // let's request the middle segment.
  3945.     goog.asserts.assert(segments.length, 'Should have segments!');
  3946.     let segmentIndex = Math.trunc((segments.length - 1) / 2);
  3947.     let segment = segments[segmentIndex];
  3948.     while (segment.status == shaka.media.SegmentReference.Status.MISSING &&
  3949.         segmentIndex < segments.length) {
  3950.       segmentIndex ++;
  3951.       segment = segments[segmentIndex];
  3952.     }
  3954.     if (segment.status == shaka.media.SegmentReference.Status.MISSING) {
  3955.       return this.guessMimeTypeFallback_(contentType);
  3956.     }
  3958.     const segmentUris = segment.getUris();
  3960.     const parsedUri = new goog.Uri(segmentUris[0]);
  3961.     const extension = parsedUri.getPath().split('.').pop();
  3962.     const map = HlsParser.EXTENSION_MAP_BY_CONTENT_TYPE_[contentType];
  3964.     let mimeType = map[extension];
  3965.     if (mimeType) {
  3966.       return mimeType;
  3967.     }
  3969.     mimeType = HlsParser.RAW_FORMATS_TO_MIME_TYPES_[extension];
  3970.     if (mimeType) {
  3971.       return mimeType;
  3972.     }
  3974.     // The extension map didn't work, so guess based on codecs.
  3975.     mimeType = this.guessMimeTypeBeforeLoading_(contentType, codecs);
  3976.     if (mimeType) {
  3977.       return mimeType;
  3978.     }
  3980.     // If unable to guess mime type, request a segment and try getting it
  3981.     // from the response.
  3982.     let contentMimeType;
  3983.     const type = shaka.net.NetworkingEngine.AdvancedRequestType.MEDIA_SEGMENT;
  3984.     const headRequest = shaka.net.NetworkingEngine.makeRequest(
  3985.         segmentUris, this.config_.retryParameters);
  3986.     try {
  3987.       headRequest.method = 'HEAD';
  3988.       const response = await this.makeNetworkRequest_(
  3989.           headRequest, requestType, {type});
  3991.       contentMimeType = response.headers['content-type'];
  3992.     } catch (error) {
  3993.       if (error &&
  3994.         (error.code == shaka.util.Error.Code.HTTP_ERROR ||
  3995.          error.code == shaka.util.Error.Code.BAD_HTTP_STATUS)) {
  3996.         headRequest.method = 'GET';
  3997.         const response = await this.makeNetworkRequest_(
  3998.             headRequest, requestType, {type});
  4000.         contentMimeType = response.headers['content-type'];
  4001.       }
  4002.     }
  4004.     if (contentMimeType) {
  4005.       // Split the MIME type in case the server sent additional parameters.
  4006.       return contentMimeType.toLowerCase().split(';')[0];
  4007.     }
  4009.     return this.guessMimeTypeFallback_(contentType);
  4010.   }
  4012.   /**
  4013.    * Returns a tag with a given name.
  4014.    * Throws an error if tag was not found.
  4015.    *
  4016.    * @param {!Array.<shaka.hls.Tag>} tags
  4017.    * @param {string} tagName
  4018.    * @return {!shaka.hls.Tag}
  4019.    * @private
  4020.    */
  4021.   getRequiredTag_(tags, tagName) {
  4022.     const tag = shaka.hls.Utils.getFirstTagWithName(tags, tagName);
  4023.     if (!tag) {
  4024.       throw new shaka.util.Error(
  4025.           shaka.util.Error.Severity.CRITICAL,
  4026.           shaka.util.Error.Category.MANIFEST,
  4027.           shaka.util.Error.Code.HLS_REQUIRED_TAG_MISSING, tagName);
  4028.     }
  4030.     return tag;
  4031.   }
  4033.   /**
  4034.    * @param {shaka.extern.Stream} stream
  4035.    * @param {?string} width
  4036.    * @param {?string} height
  4037.    * @param {?string} frameRate
  4038.    * @param {?string} videoRange
  4039.    * @param {?string} videoLayout
  4040.    * @param {?string} colorGamut
  4041.    * @private
  4042.    */
  4043.   addVideoAttributes_(stream, width, height, frameRate, videoRange,
  4044.       videoLayout, colorGamut) {
  4045.     if (stream) {
  4046.       stream.width = Number(width) || undefined;
  4047.       stream.height = Number(height) || undefined;
  4048.       stream.frameRate = Number(frameRate) || undefined;
  4049.       stream.hdr = videoRange || undefined;
  4050.       stream.videoLayout = videoLayout || undefined;
  4051.       stream.colorGamut = colorGamut || undefined;
  4052.     }
  4053.   }
  4055.   /**
  4056.    * Makes a network request for the manifest and returns a Promise
  4057.    * with the resulting data.
  4058.    *
  4059.    * @param {!Array.<string>} uris
  4060.    * @param {boolean=} isPlaylist
  4061.    * @return {!Promise.<!shaka.extern.Response>}
  4062.    * @private
  4063.    */
  4064.   requestManifest_(uris, isPlaylist) {
  4065.     const requestType = shaka.net.NetworkingEngine.RequestType.MANIFEST;
  4067.     const request = shaka.net.NetworkingEngine.makeRequest(
  4068.         uris, this.config_.retryParameters);
  4070.     const type = isPlaylist ?
  4071.         shaka.net.NetworkingEngine.AdvancedRequestType.MEDIA_PLAYLIST :
  4072.         shaka.net.NetworkingEngine.AdvancedRequestType.MASTER_PLAYLIST;
  4073.     return this.makeNetworkRequest_(request, requestType, {type});
  4074.   }
  4076.   /**
  4077.    * Called when the update timer ticks. Because parsing a manifest is async,
  4078.    * this method is async. To work with this, this method will schedule the next
  4079.    * update when it finished instead of using a repeating-start.
  4080.    *
  4081.    * @return {!Promise}
  4082.    * @private
  4083.    */
  4084.   async onUpdate_() {
  4085.     shaka.log.info('Updating manifest...');
  4087.     goog.asserts.assert(
  4088.         this.getUpdatePlaylistDelay_() > 0,
  4089.         'We should only call |onUpdate_| when we are suppose to be updating.');
  4091.     // Detect a call to stop()
  4092.     if (!this.playerInterface_) {
  4093.       return;
  4094.     }
  4096.     try {
  4097.       const startTime = Date.now();
  4098.       await this.update();
  4100.       // Keep track of how long the longest manifest update took.
  4101.       const endTime = Date.now();
  4103.       // This may have converted to VOD, in which case we stop updating.
  4104.       if (this.isLive_()) {
  4105.         const updateDuration = (endTime - startTime) / 1000.0;
  4106.         this.averageUpdateDuration_.sample(1, updateDuration);
  4107.         const delay = this.getUpdatePlaylistDelay_();
  4108.         const finalDelay = Math.max(0,
  4109.             delay - this.averageUpdateDuration_.getEstimate());
  4110.         this.updatePlaylistTimer_.tickAfter(/* seconds= */ finalDelay);
  4111.       }
  4112.     } catch (error) {
  4113.       // Detect a call to stop() during this.update()
  4114.       if (!this.playerInterface_) {
  4115.         return;
  4116.       }
  4118.       goog.asserts.assert(error instanceof shaka.util.Error,
  4119.           'Should only receive a Shaka error');
  4121.       if (this.config_.raiseFatalErrorOnManifestUpdateRequestFailure) {
  4122.         this.playerInterface_.onError(error);
  4123.         return;
  4124.       }
  4126.       // We will retry updating, so override the severity of the error.
  4127.       error.severity = shaka.util.Error.Severity.RECOVERABLE;
  4128.       this.playerInterface_.onError(error);
  4130.       // Try again very soon.
  4131.       this.updatePlaylistTimer_.tickAfter(/* seconds= */ 0.1);
  4132.     }
  4134.     // Detect a call to stop()
  4135.     if (!this.playerInterface_) {
  4136.       return;
  4137.     }
  4139.     this.playerInterface_.onManifestUpdated();
  4140.   }
  4143.   /**
  4144.    * @return {boolean}
  4145.    * @private
  4146.    */
  4147.   isLive_() {
  4148.     const PresentationType = shaka.hls.HlsParser.PresentationType_;
  4149.     return this.presentationType_ != PresentationType.VOD;
  4150.   }
  4153.   /**
  4154.    * @return {number}
  4155.    * @private
  4156.    */
  4157.   getUpdatePlaylistDelay_() {
  4158.     // The HLS spec (RFC 8216) states in 6.3.4:
  4159.     // "the client MUST wait for at least the target duration before
  4160.     // attempting to reload the Playlist file again".
  4161.     // For LL-HLS, the server must add a new partial segment to the Playlist
  4162.     // every part target duration.
  4163.     return this.lastTargetDuration_;
  4164.   }
  4167.   /**
  4168.    * @param {shaka.hls.HlsParser.PresentationType_} type
  4169.    * @private
  4170.    */
  4171.   setPresentationType_(type) {
  4172.     this.presentationType_ = type;
  4174.     if (this.presentationTimeline_) {
  4175.       this.presentationTimeline_.setStatic(!this.isLive_());
  4176.     }
  4178.     // If this manifest is not for live content, then we have no reason to
  4179.     // update it.
  4180.     if (!this.isLive_()) {
  4181.       this.updatePlaylistTimer_.stop();
  4182.     }
  4183.   }
  4186.   /**
  4187.    * Create a networking request. This will manage the request using the
  4188.    * parser's operation manager. If the parser has already been stopped, the
  4189.    * request will not be made.
  4190.    *
  4191.    * @param {shaka.extern.Request} request
  4192.    * @param {shaka.net.NetworkingEngine.RequestType} type
  4193.    * @param {shaka.extern.RequestContext=} context
  4194.    * @return {!Promise.<shaka.extern.Response>}
  4195.    * @private
  4196.    */
  4197.   makeNetworkRequest_(request, type, context) {
  4198.     if (!this.operationManager_) {
  4199.       throw new shaka.util.Error(
  4200.           shaka.util.Error.Severity.CRITICAL,
  4201.           shaka.util.Error.Category.PLAYER,
  4202.           shaka.util.Error.Code.OPERATION_ABORTED);
  4203.     }
  4205.     const op = this.playerInterface_.networkingEngine.request(
  4206.         type, request, context);
  4207.     this.operationManager_.manage(op);
  4209.     return op.promise;
  4210.   }
  4212.   /**
  4213.    * @param {string} method
  4214.    * @return {boolean}
  4215.    * @private
  4216.    */
  4217.   isAesMethod_(method) {
  4218.     return method == 'AES-128' ||
  4219.         method == 'AES-256' ||
  4220.         method == 'AES-256-CTR';
  4221.   }
  4223.   /**
  4224.    * @param {!shaka.hls.Tag} drmTag
  4225.    * @param {string} mimeType
  4226.    * @return {?shaka.extern.DrmInfo}
  4227.    * @private
  4228.    */
  4229.   static fairplayDrmParser_(drmTag, mimeType) {
  4230.     if (mimeType == 'video/mp2t') {
  4231.       throw new shaka.util.Error(
  4232.           shaka.util.Error.Severity.CRITICAL,
  4233.           shaka.util.Error.Category.MANIFEST,
  4234.           shaka.util.Error.Code.HLS_MSE_ENCRYPTED_MP2T_NOT_SUPPORTED);
  4235.     }
  4237.     if (shaka.util.Platform.isMediaKeysPolyfilled()) {
  4238.       throw new shaka.util.Error(
  4239.           shaka.util.Error.Severity.CRITICAL,
  4240.           shaka.util.Error.Category.MANIFEST,
  4241.           shaka.util.Error.Code
  4242.               .HLS_MSE_ENCRYPTED_LEGACY_APPLE_MEDIA_KEYS_NOT_SUPPORTED);
  4243.     }
  4245.     const method = drmTag.getRequiredAttrValue('METHOD');
  4246.     const VALID_METHODS = ['SAMPLE-AES', 'SAMPLE-AES-CTR'];
  4247.     if (!VALID_METHODS.includes(method)) {
  4248.       shaka.log.error('FairPlay in HLS is only supported with [',
  4249.           VALID_METHODS.join(', '), '], not', method);
  4250.       return null;
  4251.     }
  4253.     let encryptionScheme = 'cenc';
  4254.     if (method == 'SAMPLE-AES') {
  4255.       // It should be 'cbcs-1-9' but Safari doesn't support it.
  4256.       // See: https://github.com/WebKit/WebKit/blob/main/Source/WebCore/Modules/encryptedmedia/MediaKeyEncryptionScheme.idl
  4257.       encryptionScheme = 'cbcs';
  4258.     }
  4260.     /*
  4261.      * Even if we're not able to construct initData through the HLS tag, adding
  4262.      * a DRMInfo will allow DRM Engine to request a media key system access
  4263.      * with the correct keySystem and initDataType
  4264.      */
  4265.     const drmInfo = shaka.util.ManifestParserUtils.createDrmInfo(
  4266.         'com.apple.fps', encryptionScheme, [
  4267.           {initDataType: 'sinf', initData: new Uint8Array(0), keyId: null},
  4268.         ]);
  4270.     return drmInfo;
  4271.   }
  4273.   /**
  4274.    * @param {!shaka.hls.Tag} drmTag
  4275.    * @return {?shaka.extern.DrmInfo}
  4276.    * @private
  4277.    */
  4278.   static widevineDrmParser_(drmTag) {
  4279.     const method = drmTag.getRequiredAttrValue('METHOD');
  4280.     const VALID_METHODS = ['SAMPLE-AES', 'SAMPLE-AES-CTR'];
  4281.     if (!VALID_METHODS.includes(method)) {
  4282.       shaka.log.error('Widevine in HLS is only supported with [',
  4283.           VALID_METHODS.join(', '), '], not', method);
  4284.       return null;
  4285.     }
  4287.     let encryptionScheme = 'cenc';
  4288.     if (method == 'SAMPLE-AES') {
  4289.       encryptionScheme = 'cbcs';
  4290.     }
  4292.     const uri = drmTag.getRequiredAttrValue('URI');
  4293.     const parsedData = shaka.net.DataUriPlugin.parseRaw(uri.split('?')[0]);
  4295.     // The data encoded in the URI is a PSSH box to be used as init data.
  4296.     const pssh = shaka.util.BufferUtils.toUint8(parsedData.data);
  4297.     const drmInfo = shaka.util.ManifestParserUtils.createDrmInfo(
  4298.         'com.widevine.alpha', encryptionScheme, [
  4299.           {initDataType: 'cenc', initData: pssh},
  4300.         ]);
  4302.     const keyId = drmTag.getAttributeValue('KEYID');
  4303.     if (keyId) {
  4304.       const keyIdLowerCase = keyId.toLowerCase();
  4305.       // This value should begin with '0x':
  4306.       goog.asserts.assert(
  4307.           keyIdLowerCase.startsWith('0x'), 'Incorrect KEYID format!');
  4308.       // But the output should not contain the '0x':
  4309.       drmInfo.keyIds = new Set([keyIdLowerCase.substr(2)]);
  4310.     }
  4311.     return drmInfo;
  4312.   }
  4314.   /**
  4315.    * See: https://docs.microsoft.com/en-us/playready/packaging/mp4-based-formats-supported-by-playready-clients?tabs=case4
  4316.    *
  4317.    * @param {!shaka.hls.Tag} drmTag
  4318.    * @return {?shaka.extern.DrmInfo}
  4319.    * @private
  4320.    */
  4321.   static playreadyDrmParser_(drmTag) {
  4322.     const method = drmTag.getRequiredAttrValue('METHOD');
  4323.     const VALID_METHODS = ['SAMPLE-AES', 'SAMPLE-AES-CTR'];
  4324.     if (!VALID_METHODS.includes(method)) {
  4325.       shaka.log.error('PlayReady in HLS is only supported with [',
  4326.           VALID_METHODS.join(', '), '], not', method);
  4327.       return null;
  4328.     }
  4330.     let encryptionScheme = 'cenc';
  4331.     if (method == 'SAMPLE-AES') {
  4332.       encryptionScheme = 'cbcs';
  4333.     }
  4335.     const uri = drmTag.getRequiredAttrValue('URI');
  4336.     const parsedData = shaka.net.DataUriPlugin.parseRaw(uri.split('?')[0]);
  4338.     // The data encoded in the URI is a PlayReady Pro Object, so we need
  4339.     // convert it to pssh.
  4340.     const data = shaka.util.BufferUtils.toUint8(parsedData.data);
  4341.     const systemId = new Uint8Array([
  4342.       0x9a, 0x04, 0xf0, 0x79, 0x98, 0x40, 0x42, 0x86,
  4343.       0xab, 0x92, 0xe6, 0x5b, 0xe0, 0x88, 0x5f, 0x95,
  4344.     ]);
  4345.     const keyIds = new Set();
  4346.     const psshVersion = 0;
  4347.     const pssh =
  4348.         shaka.util.Pssh.createPssh(data, systemId, keyIds, psshVersion);
  4349.     const drmInfo = shaka.util.ManifestParserUtils.createDrmInfo(
  4350.         'com.microsoft.playready', encryptionScheme, [
  4351.           {initDataType: 'cenc', initData: pssh},
  4352.         ]);
  4354.     return drmInfo;
  4355.   }
  4357.   /**
  4358.    * See: https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis-11#section-5.1
  4359.    *
  4360.    * @param {!shaka.hls.Tag} drmTag
  4361.    * @param {string} mimeType
  4362.    * @param {function():!Array.<string>} getUris
  4363.    * @param {?shaka.media.InitSegmentReference} initSegmentRef
  4364.    * @param {?Map.<string, string>=} variables
  4365.    * @return {!Promise.<?shaka.extern.DrmInfo>}
  4366.    * @private
  4367.    */
  4368.   async identityDrmParser_(drmTag, mimeType, getUris, initSegmentRef,
  4369.       variables) {
  4370.     if (mimeType == 'video/mp2t') {
  4371.       throw new shaka.util.Error(
  4372.           shaka.util.Error.Severity.CRITICAL,
  4373.           shaka.util.Error.Category.MANIFEST,
  4374.           shaka.util.Error.Code.HLS_MSE_ENCRYPTED_MP2T_NOT_SUPPORTED);
  4375.     }
  4377.     if (shaka.util.Platform.isMediaKeysPolyfilled()) {
  4378.       throw new shaka.util.Error(
  4379.           shaka.util.Error.Severity.CRITICAL,
  4380.           shaka.util.Error.Category.MANIFEST,
  4381.           shaka.util.Error.Code
  4382.               .HLS_MSE_ENCRYPTED_LEGACY_APPLE_MEDIA_KEYS_NOT_SUPPORTED);
  4383.     }
  4385.     const method = drmTag.getRequiredAttrValue('METHOD');
  4386.     const VALID_METHODS = ['SAMPLE-AES', 'SAMPLE-AES-CTR'];
  4387.     if (!VALID_METHODS.includes(method)) {
  4388.       shaka.log.error('Identity (ClearKey) in HLS is only supported with [',
  4389.           VALID_METHODS.join(', '), '], not', method);
  4390.       return null;
  4391.     }
  4393.     const keyUris = shaka.hls.Utils.constructSegmentUris(
  4394.         getUris(), drmTag.getRequiredAttrValue('URI'), variables);
  4396.     let key;
  4397.     if (keyUris[0].startsWith('data:text/plain;base64,')) {
  4398.       key = shaka.util.Uint8ArrayUtils.toHex(
  4399.           shaka.util.Uint8ArrayUtils.fromBase64(
  4400.               keyUris[0].split('data:text/plain;base64,').pop()));
  4401.     } else {
  4402.       const keyMapKey = keyUris.sort().join('');
  4403.       if (!this.identityKeyMap_.has(keyMapKey)) {
  4404.         const requestType = shaka.net.NetworkingEngine.RequestType.KEY;
  4405.         const request = shaka.net.NetworkingEngine.makeRequest(
  4406.             keyUris, this.config_.retryParameters);
  4407.         const keyResponse = this.makeNetworkRequest_(request, requestType);
  4408.         this.identityKeyMap_.set(keyMapKey, keyResponse);
  4409.       }
  4410.       const keyResponse = await this.identityKeyMap_.get(keyMapKey);
  4411.       key = shaka.util.Uint8ArrayUtils.toHex(keyResponse.data);
  4412.     }
  4414.     // NOTE: The ClearKey CDM requires a key-id to key mapping.  HLS doesn't
  4415.     // provide a key ID anywhere.  So although we could use the 'URI' attribute
  4416.     // to fetch the actual 16-byte key, without a key ID, we can't provide this
  4417.     // automatically to the ClearKey CDM. By default we assume that keyId is 0,
  4418.     // but we will try to get key ID from Init Segment.
  4419.     // If the application want override this behavior will have to use
  4420.     // player.configure('drm.clearKeys', { ... }) to provide the key IDs
  4421.     // and keys or player.configure('drm.servers.org\.w3\.clearkey', ...) to
  4422.     // provide a ClearKey license server URI.
  4423.     let keyId = '00000000000000000000000000000000';
  4425.     if (initSegmentRef) {
  4426.       let defaultKID;
  4427.       if (this.identityKidMap_.has(initSegmentRef)) {
  4428.         defaultKID = this.identityKidMap_.get(initSegmentRef);
  4429.       } else {
  4430.         const initSegmentRequest = shaka.util.Networking.createSegmentRequest(
  4431.             initSegmentRef.getUris(),
  4432.             initSegmentRef.getStartByte(),
  4433.             initSegmentRef.getEndByte(),
  4434.             this.config_.retryParameters);
  4435.         const requestType = shaka.net.NetworkingEngine.RequestType.SEGMENT;
  4436.         const initType =
  4437.             shaka.net.NetworkingEngine.AdvancedRequestType.INIT_SEGMENT;
  4438.         const initResponse = await this.makeNetworkRequest_(
  4439.             initSegmentRequest, requestType, {type: initType});
  4441.         defaultKID = shaka.media.SegmentUtils.getDefaultKID(
  4442.             initResponse.data);
  4443.         this.identityKidMap_.set(initSegmentRef, defaultKID);
  4444.       }
  4445.       if (defaultKID) {
  4446.         keyId = defaultKID;
  4447.       }
  4448.     }
  4450.     const clearkeys = new Map();
  4451.     clearkeys.set(keyId, key);
  4453.     let encryptionScheme = 'cenc';
  4454.     if (method == 'SAMPLE-AES') {
  4455.       encryptionScheme = 'cbcs';
  4456.     }
  4458.     return shaka.util.ManifestParserUtils.createDrmInfoFromClearKeys(
  4459.         clearkeys, encryptionScheme);
  4460.   }
  4461. };
  4464. /**
  4465.  * @typedef {{
  4466.  *   stream: !shaka.extern.Stream,
  4467.  *   type: string,
  4468.  *   redirectUris: !Array.<string>,
  4469.  *   getUris: function():!Array.<string>,
  4470.  *   minTimestamp: number,
  4471.  *   maxTimestamp: number,
  4472.  *   mediaSequenceToStartTime: !Map.<number, number>,
  4473.  *   canSkipSegments: boolean,
  4474.  *   canBlockReload: boolean,
  4475.  *   hasEndList: boolean,
  4476.  *   firstSequenceNumber: number,
  4477.  *   nextMediaSequence: number,
  4478.  *   nextPart: number,
  4479.  *   loadedOnce: boolean
  4480.  * }}
  4481.  *
  4482.  * @description
  4483.  * Contains a stream and information about it.
  4484.  *
  4485.  * @property {!shaka.extern.Stream} stream
  4486.  *   The Stream itself.
  4487.  * @property {string} type
  4488.  *   The type value. Could be 'video', 'audio', 'text', or 'image'.
  4489.  * @property {!Array.<string>} redirectUris
  4490.  *   The redirect URIs.
  4491.  * @property {function():!Array.<string>} getUris
  4492.  *   The verbatim media playlist URIs, as it appeared in the master playlist.
  4493.  * @property {number} minTimestamp
  4494.  *   The minimum timestamp found in the stream.
  4495.  * @property {number} maxTimestamp
  4496.  *   The maximum timestamp found in the stream.
  4497.  * @property {!Map.<number, number>} mediaSequenceToStartTime
  4498.  *   A map of media sequence numbers to media start times.
  4499.  *   Only used for VOD content.
  4500.  * @property {boolean} canSkipSegments
  4501.  *   True if the server supports delta playlist updates, and we can send a
  4502.  *   request for a playlist that can skip older media segments.
  4503.  * @property {boolean} canBlockReload
  4504.  *   True if the server supports blocking playlist reload, and we can send a
  4505.  *   request for a playlist that can block reload until some segments are
  4506.  *   present.
  4507.  * @property {boolean} hasEndList
  4508.  *   True if the stream has an EXT-X-ENDLIST tag.
  4509.  * @property {number} firstSequenceNumber
  4510.  *   The sequence number of the first reference. Only calculated if needed.
  4511.  * @property {number} nextMediaSequence
  4512.  *   The next media sequence.
  4513.  * @property {number} nextPart
  4514.  *   The next part.
  4515.  * @property {boolean} loadedOnce
  4516.  *   True if the stream has been loaded at least once.
  4517.  */
  4518. shaka.hls.HlsParser.StreamInfo;
  4521. /**
  4522.  * @typedef {{
  4523.  *   audio: !Array.<shaka.hls.HlsParser.StreamInfo>,
  4524.  *   video: !Array.<shaka.hls.HlsParser.StreamInfo>
  4525.  * }}
  4526.  *
  4527.  * @description Audio and video stream infos.
  4528.  * @property {!Array.<shaka.hls.HlsParser.StreamInfo>} audio
  4529.  * @property {!Array.<shaka.hls.HlsParser.StreamInfo>} video
  4530.  */
  4531. shaka.hls.HlsParser.StreamInfos;
  4534. /**
  4535.  * @const {!Object.<string, string>}
  4536.  * @private
  4537.  */
  4538. shaka.hls.HlsParser.RAW_FORMATS_TO_MIME_TYPES_ = {
  4539.   'aac': 'audio/aac',
  4540.   'ac3': 'audio/ac3',
  4541.   'ec3': 'audio/ec3',
  4542.   'mp3': 'audio/mpeg',
  4543. };
  4546. /**
  4547.  * @const {!Object.<string, string>}
  4548.  * @private
  4549.  */
  4550. shaka.hls.HlsParser.AUDIO_EXTENSIONS_TO_MIME_TYPES_ = {
  4551.   'mp4': 'audio/mp4',
  4552.   'mp4a': 'audio/mp4',
  4553.   'm4s': 'audio/mp4',
  4554.   'm4i': 'audio/mp4',
  4555.   'm4a': 'audio/mp4',
  4556.   'm4f': 'audio/mp4',
  4557.   'cmfa': 'audio/mp4',
  4558.   // MPEG2-TS also uses video/ for audio: https://bit.ly/TsMse
  4559.   'ts': 'video/mp2t',
  4560.   'tsa': 'video/mp2t',
  4561. };
  4564. /**
  4565.  * @const {!Object.<string, string>}
  4566.  * @private
  4567.  */
  4568. shaka.hls.HlsParser.VIDEO_EXTENSIONS_TO_MIME_TYPES_ = {
  4569.   'mp4': 'video/mp4',
  4570.   'mp4v': 'video/mp4',
  4571.   'm4s': 'video/mp4',
  4572.   'm4i': 'video/mp4',
  4573.   'm4v': 'video/mp4',
  4574.   'm4f': 'video/mp4',
  4575.   'cmfv': 'video/mp4',
  4576.   'ts': 'video/mp2t',
  4577.   'tsv': 'video/mp2t',
  4578. };
  4581. /**
  4582.  * @const {!Object.<string, string>}
  4583.  * @private
  4584.  */
  4585. shaka.hls.HlsParser.TEXT_EXTENSIONS_TO_MIME_TYPES_ = {
  4586.   'mp4': 'application/mp4',
  4587.   'm4s': 'application/mp4',
  4588.   'm4i': 'application/mp4',
  4589.   'm4f': 'application/mp4',
  4590.   'cmft': 'application/mp4',
  4591.   'vtt': 'text/vtt',
  4592.   'webvtt': 'text/vtt',
  4593.   'ttml': 'application/ttml+xml',
  4594. };
  4597. /**
  4598.  * @const {!Object.<string, string>}
  4599.  * @private
  4600.  */
  4601. shaka.hls.HlsParser.IMAGE_EXTENSIONS_TO_MIME_TYPES_ = {
  4602.   'jpg': 'image/jpeg',
  4603.   'png': 'image/png',
  4604.   'svg': 'image/svg+xml',
  4605.   'webp': 'image/webp',
  4606.   'avif': 'image/avif',
  4607. };
  4610. /**
  4611.  * @const {!Object.<string, !Object.<string, string>>}
  4612.  * @private
  4613.  */
  4614. shaka.hls.HlsParser.EXTENSION_MAP_BY_CONTENT_TYPE_ = {
  4615.   'audio': shaka.hls.HlsParser.AUDIO_EXTENSIONS_TO_MIME_TYPES_,
  4616.   'video': shaka.hls.HlsParser.VIDEO_EXTENSIONS_TO_MIME_TYPES_,
  4617.   'text': shaka.hls.HlsParser.TEXT_EXTENSIONS_TO_MIME_TYPES_,
  4618.   'image': shaka.hls.HlsParser.IMAGE_EXTENSIONS_TO_MIME_TYPES_,
  4619. };
  4622. /**
  4623.  * @typedef {function(!shaka.hls.Tag, string):?shaka.extern.DrmInfo}
  4624.  * @private
  4625.  */
  4626. shaka.hls.HlsParser.DrmParser_;
  4629. /**
  4630.  * @const {!Object.<string, shaka.hls.HlsParser.DrmParser_>}
  4631.  * @private
  4632.  */
  4633. shaka.hls.HlsParser.KEYFORMATS_TO_DRM_PARSERS_ = {
  4634.   'com.apple.streamingkeydelivery':
  4635.       shaka.hls.HlsParser.fairplayDrmParser_,
  4636.   'urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed':
  4637.       shaka.hls.HlsParser.widevineDrmParser_,
  4638.   'com.microsoft.playready':
  4639.       shaka.hls.HlsParser.playreadyDrmParser_,
  4640. };
  4643. /**
  4644.  * @enum {string}
  4645.  * @private
  4646.  */
  4647. shaka.hls.HlsParser.PresentationType_ = {
  4648.   VOD: 'VOD',
  4649.   EVENT: 'EVENT',
  4650.   LIVE: 'LIVE',
  4651. };
  4653. shaka.media.ManifestParser.registerParserByMime(
  4654.     'application/x-mpegurl', () => new shaka.hls.HlsParser());
  4655. shaka.media.ManifestParser.registerParserByMime(
  4656.     'application/vnd.apple.mpegurl', () => new shaka.hls.HlsParser());