shaka-player/lib/hls/hls_parser.js

DASH/EME video player library

/*! @license
 * Shaka Player
 * Copyright 2016 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */


goog.provide('shaka.hls.HlsParser');

goog.require('goog.Uri');
goog.require('goog.asserts');
goog.require('shaka.hls.ManifestTextParser');
goog.require('shaka.hls.Playlist');
goog.require('shaka.hls.PlaylistType');
goog.require('shaka.hls.Tag');
goog.require('shaka.hls.Utils');
goog.require('shaka.log');
goog.require('shaka.media.DrmEngine');
goog.require('shaka.media.InitSegmentReference');
goog.require('shaka.media.ManifestParser');
goog.require('shaka.media.MediaSourceEngine');
goog.require('shaka.media.PresentationTimeline');
goog.require('shaka.media.SegmentIndex');
goog.require('shaka.media.SegmentReference');
goog.require('shaka.net.DataUriPlugin');
goog.require('shaka.net.NetworkingEngine');
goog.require('shaka.util.ArrayUtils');
goog.require('shaka.util.BufferUtils');
goog.require('shaka.util.CmcdManager');
goog.require('shaka.util.Error');
goog.require('shaka.util.FakeEvent');
goog.require('shaka.util.Functional');
goog.require('shaka.util.LanguageUtils');
goog.require('shaka.util.ManifestParserUtils');
goog.require('shaka.util.MimeUtils');
goog.require('shaka.util.OperationManager');
goog.require('shaka.util.Pssh');
goog.require('shaka.util.Timer');
goog.require('shaka.util.Platform');
goog.require('shaka.util.Uint8ArrayUtils');
goog.require('shaka.util.XmlUtils');
goog.requireType('shaka.hls.Segment');


/**
 * HLS parser.
 *
 * @implements {shaka.extern.ManifestParser}
 * @export
 */
shaka.hls.HlsParser = class {
  /**
   * Creates an Hls Parser object.
   */
  constructor() {
    /** @private {?shaka.extern.ManifestParser.PlayerInterface} */
    this.playerInterface_ = null;

    /** @private {?shaka.extern.ManifestConfiguration} */
    this.config_ = null;

    /** @private {number} */
    this.globalId_ = 1;

    /** @private {!Map.<string, string>} */
    this.globalVariables_ = new Map();

    /**
     * A map from group id to stream infos created from the media tags.
     * @private {!Map.<string, !Array.<?shaka.hls.HlsParser.StreamInfo>>}
     */
    this.groupIdToStreamInfosMap_ = new Map();

    /**
     * For media playlist lazy-loading to work in livestreams, we have to assume
     * that each stream of a type (video, audio, etc) has the same mappings of
     * sequence number to start time.
     * This map stores those relationships.
     * Only used during livestreams; we do not assume that VOD content is
     * aligned in that way.
     * @private {!Map.<string, !Map.<number, number>>}
     */
    this.mediaSequenceToStartTimeByType_ = new Map();

    // Set initial maps.
    const ContentType = shaka.util.ManifestParserUtils.ContentType;
    this.mediaSequenceToStartTimeByType_.set(ContentType.VIDEO, new Map());
    this.mediaSequenceToStartTimeByType_.set(ContentType.AUDIO, new Map());
    this.mediaSequenceToStartTimeByType_.set(ContentType.TEXT, new Map());
    this.mediaSequenceToStartTimeByType_.set(ContentType.IMAGE, new Map());

    /**
     * The values are strings of the form "<VIDEO URI> - <AUDIO URI>",
     * where the URIs are the verbatim media playlist URIs as they appeared in
     * the master playlist.
     *
     * Used to avoid duplicates that vary only in their text stream.
     *
     * @private {!Set.<string>}
     */
    this.variantUriSet_ = new Set();

    /**
     * A map from (verbatim) media playlist URI to stream infos representing the
     * playlists.
     *
     * On update, used to iterate through and update from media playlists.
     *
     * On initial parse, used to iterate through and determine minimum
     * timestamps, offsets, and to handle TS rollover.
     *
     * During parsing, used to avoid duplicates in the async methods
     * createStreamInfoFromMediaTag_, createStreamInfoFromImageTag_ and
     * createStreamInfoFromVariantTag_.
     *
     * @private {!Map.<string, shaka.hls.HlsParser.StreamInfo>}
     */
    this.uriToStreamInfosMap_ = new Map();

    /** @private {?shaka.media.PresentationTimeline} */
    this.presentationTimeline_ = null;

    /**
     * The master playlist URI, after redirects.
     *
     * @private {string}
     */
    this.masterPlaylistUri_ = '';

    /** @private {shaka.hls.ManifestTextParser} */
    this.manifestTextParser_ = new shaka.hls.ManifestTextParser();

    /**
     * This is the number of seconds we want to wait between finishing a
     * manifest update and starting the next one. This will be set when we parse
     * the manifest.
     *
     * @private {number}
     */
    this.updatePlaylistDelay_ = 0;

    /**
     * The minimum sequence number for generated segments, when ignoring
     * EXT-X-PROGRAM-DATE-TIME.
     *
     * @private {number}
     */
    this.minSequenceNumber_ = -1;

    /**
     * The lowest time value for any of the streams, as defined by the
     * EXT-X-PROGRAM-DATE-TIME value. Measured in seconds since January 1, 1970.
     *
     * @private {number}
     */
    this.lowestSyncTime_ = Infinity;

    /**
     * Whether the streams have previously been "finalized"; that is to say,
     * whether we have loaded enough streams to know information about the asset
     * such as timing information, live status, etc.
     *
     * @private {boolean}
     */
    this.streamsFinalized_ = false;

    /**
     * This timer is used to trigger the start of a manifest update. A manifest
     * update is async. Once the update is finished, the timer will be restarted
     * to trigger the next update. The timer will only be started if the content
     * is live content.
     *
     * @private {shaka.util.Timer}
     */
    this.updatePlaylistTimer_ = new shaka.util.Timer(() => {
      this.onUpdate_();
    });

    /** @private {shaka.hls.HlsParser.PresentationType_} */
    this.presentationType_ = shaka.hls.HlsParser.PresentationType_.VOD;

    /** @private {?shaka.extern.Manifest} */
    this.manifest_ = null;

    /** @private {number} */
    this.maxTargetDuration_ = 0;

    /** @private {number} */
    this.minTargetDuration_ = Infinity;

    /** Partial segments target duration.
     * @private {number}
     */
    this.partialTargetDuration_ = 0;

    /** @private {number} */
    this.lowLatencyPresentationDelay_ = 0;

    /** @private {shaka.util.OperationManager} */
    this.operationManager_ = new shaka.util.OperationManager();

    /** A map from closed captions' group id, to a map of closed captions info.
     * {group id -> {closed captions channel id -> language}}
     * @private {Map.<string, Map.<string, string>>}
     */
    this.groupIdToClosedCaptionsMap_ = new Map();

    /** @private {Map.<string, string>} */
    this.groupIdToCodecsMap_ = new Map();

    /** A cache mapping EXT-X-MAP tag info to the InitSegmentReference created
     * from the tag.
     * The key is a string combining the EXT-X-MAP tag's absolute uri, and
     * its BYTERANGE if available.
     * {!Map.<string, !shaka.media.InitSegmentReference>} */
    this.mapTagToInitSegmentRefMap_ = new Map();

    /** @private {boolean} */
    this.lowLatencyMode_ = false;
  }


  /**
   * @override
   * @exportInterface
   */
  configure(config) {
    this.config_ = config;
  }

  /**
   * @override
   * @exportInterface
   */
  async start(uri, playerInterface) {
    goog.asserts.assert(this.config_, 'Must call configure() before start()!');
    this.playerInterface_ = playerInterface;
    this.lowLatencyMode_ = playerInterface.isLowLatencyMode();

    const response = await this.requestManifest_(uri);

    // Record the master playlist URI after redirects.
    this.masterPlaylistUri_ = response.uri;

    goog.asserts.assert(response.data, 'Response data should be non-null!');
    await this.parseManifest_(response.data, uri);

    goog.asserts.assert(this.manifest_, 'Manifest should be non-null');
    return this.manifest_;
  }

  /**
   * @override
   * @exportInterface
   */
  stop() {
    // Make sure we don't update the manifest again. Even if the timer is not
    // running, this is safe to call.
    if (this.updatePlaylistTimer_) {
      this.updatePlaylistTimer_.stop();
      this.updatePlaylistTimer_ = null;
    }

    /** @type {!Array.<!Promise>} */
    const pending = [];

    if (this.operationManager_) {
      pending.push(this.operationManager_.destroy());
      this.operationManager_ = null;
    }

    this.playerInterface_ = null;
    this.config_ = null;
    this.variantUriSet_.clear();
    this.manifest_ = null;
    this.uriToStreamInfosMap_.clear();
    this.groupIdToStreamInfosMap_.clear();
    this.groupIdToCodecsMap_.clear();
    this.globalVariables_.clear();

    return Promise.all(pending);
  }

  /**
   * @override
   * @exportInterface
   */
  async update() {
    if (!this.isLive_()) {
      return;
    }

    /** @type {!Array.<!Promise>} */
    const updates = [];
    const streamInfos = Array.from(this.uriToStreamInfosMap_.values());

    // Only update active streams.
    const activeStreamInfos = streamInfos.filter((s) => s.stream.segmentIndex);
    for (const streamInfo of activeStreamInfos) {
      updates.push(this.updateStream_(streamInfo));
    }
    await Promise.all(updates);

    // Now that streams have been updated, notify the presentation timeline.
    this.notifySegmentsForStreams_(activeStreamInfos.map((s) => s.stream));

    // If any hasEndList is false, the stream is still live.
    const stillLive = activeStreamInfos.some((s) => s.hasEndList == false);
    if (activeStreamInfos.length && !stillLive) {
      // Convert the presentation to VOD and set the duration.
      const PresentationType = shaka.hls.HlsParser.PresentationType_;
      this.setPresentationType_(PresentationType.VOD);

      // The duration is the minimum of the end times of all active streams.
      // Non-active streams are not guaranteed to have useful maxTimestamp
      // values, due to the lazy-loading system, so they are ignored.
      const maxTimestamps = activeStreamInfos.map((s) => s.maxTimestamp);
      // The duration is the minimum of the end times of all streams.
      this.presentationTimeline_.setDuration(Math.min(...maxTimestamps));
      this.playerInterface_.updateDuration();
    }
    if (stillLive) {
      this.determineDuration_();
    }
  }

  /**
   * @param {!shaka.hls.HlsParser.StreamInfo} streamInfo
   * @return {!Map.<number, number>}
   * @private
   */
  getMediaSequenceToStartTimeFor_(streamInfo) {
    if (this.isLive_()) {
      return this.mediaSequenceToStartTimeByType_.get(streamInfo.type);
    } else {
      return streamInfo.mediaSequenceToStartTime;
    }
  }

  /**
   * Updates a stream.
   *
   * @param {!shaka.hls.HlsParser.StreamInfo} streamInfo
   * @return {!Promise}
   * @private
   */
  async updateStream_(streamInfo) {
    const manifestUri = streamInfo.absoluteMediaPlaylistUri;
    const uriObj = new goog.Uri(manifestUri);
    if (this.lowLatencyMode_ && streamInfo.canSkipSegments) {
      // Enable delta updates. This will replace older segments with
      // 'EXT-X-SKIP' tag in the media playlist.
      uriObj.setQueryData(new goog.Uri.QueryData('_HLS_skip=YES'));
    }
    const response = await this.requestManifest_(uriObj.toString());
    if (!streamInfo.stream.segmentIndex) {
      // The stream was closed since the update was first requested.
      return;
    }

    /** @type {shaka.hls.Playlist} */
    const playlist = this.manifestTextParser_.parsePlaylist(
        response.data, response.uri);

    if (playlist.type != shaka.hls.PlaylistType.MEDIA) {
      throw new shaka.util.Error(
          shaka.util.Error.Severity.CRITICAL,
          shaka.util.Error.Category.MANIFEST,
          shaka.util.Error.Code.HLS_INVALID_PLAYLIST_HIERARCHY);
    }

    /** @type {!Array.<!shaka.hls.Tag>} */
    const variablesTags = shaka.hls.Utils.filterTagsByName(playlist.tags,
        'EXT-X-DEFINE');

    const mediaVariables = this.parseMediaVariables_(variablesTags);

    const stream = streamInfo.stream;

    const mediaSequenceToStartTime =
        this.getMediaSequenceToStartTimeFor_(streamInfo);
    const {keyIds, drmInfos} = this.parseDrmInfo_(playlist, stream.mimeType);

    const keysAreEqual =
      (a, b) => a.size === b.size && [...a].every((value) => b.has(value));

    if (!keysAreEqual(stream.keyIds, keyIds)) {
      stream.keyIds = keyIds;
      stream.drmInfos = drmInfos;
      this.playerInterface_.newDrmInfo(stream);
    }

    const segments = this.createSegments_(
        streamInfo.verbatimMediaPlaylistUri, playlist, stream.type,
        stream.mimeType, mediaSequenceToStartTime, mediaVariables);

    stream.segmentIndex.mergeAndEvict(
        segments, this.presentationTimeline_.getSegmentAvailabilityStart());
    if (segments.length) {
      const mediaSequenceNumber = shaka.hls.Utils.getFirstTagWithNameAsNumber(
          playlist.tags, 'EXT-X-MEDIA-SEQUENCE', 0);
      const playlistStartTime = mediaSequenceToStartTime.get(
          mediaSequenceNumber);
      stream.segmentIndex.evict(playlistStartTime);
    }
    const oldSegment = segments[0];
    goog.asserts.assert(oldSegment, 'Should have segments!');

    streamInfo.minTimestamp = oldSegment.startTime;

    const newestSegment = segments[segments.length - 1];
    goog.asserts.assert(newestSegment, 'Should have segments!');

    streamInfo.maxTimestamp = newestSegment.endTime;

    // Once the last segment has been added to the playlist,
    // #EXT-X-ENDLIST tag will be appended.
    // If that happened, treat the rest of the EVENT presentation as VOD.
    const endListTag =
        shaka.hls.Utils.getFirstTagWithName(playlist.tags, 'EXT-X-ENDLIST');

    if (endListTag) {
      // Flag this for later.  We don't convert the whole presentation into VOD
      // until we've seen the ENDLIST tag for all active playlists.
      streamInfo.hasEndList = true;
    }
  }


  /**
   * @override
   * @exportInterface
   */
  onExpirationUpdated(sessionId, expiration) {
    // No-op
  }

  /**
   * Align the streams by sequence number by dropping early segments.  Then
   * offset the streams to begin at presentation time 0.
   * @param {!Array.<!shaka.hls.HlsParser.StreamInfo>} streamInfos
   * @private
   */
  syncStreamsWithSequenceNumber_(streamInfos) {
    // We assume that, when this is first called, we have enough info to
    // determine how to use the program date times (e.g. we have both a video
    // and an audio, and all other videos and audios match those).
    // Thus, we only need to calculate this once.
    const updateMinSequenceNumber = this.minSequenceNumber_ == -1;
    // Sync using media sequence number.  Find the highest starting sequence
    // number among all streams.  Later, we will drop any references to
    // earlier segments in other streams, then offset everything back to 0.
    for (const streamInfo of streamInfos) {
      const segmentIndex = streamInfo.stream.segmentIndex;
      goog.asserts.assert(segmentIndex,
          'Only loaded streams should be synced');
      const mediaSequenceToStartTime =
          this.getMediaSequenceToStartTimeFor_(streamInfo);
      const segment0 = segmentIndex.earliestReference();
      if (segment0) {
        // This looks inefficient, but iteration order is insertion order.
        // So the very first entry should be the one we want.
        // We assert that this holds true so that we are alerted by debug
        // builds and tests if it changes.  We still do a loop, though, so
        // that the code functions correctly in production no matter what.
        if (goog.DEBUG) {
          const firstSequenceStartTime =
              mediaSequenceToStartTime.values().next().value;
          goog.asserts.assert(
              firstSequenceStartTime == segment0.startTime,
              'Sequence number map is not ordered as expected!');
        }
        for (const [sequence, start] of mediaSequenceToStartTime) {
          if (start == segment0.startTime) {
            if (updateMinSequenceNumber) {
              this.minSequenceNumber_ = Math.max(
                  this.minSequenceNumber_, sequence);
            }
            // Even if we already have decided on a value for
            // |this.minSequenceNumber_|, we still need to determine the first
            // sequence number for the stream, to offset it in the code below.
            streamInfo.firstSequenceNumber = sequence;
            break;
          }
        }
      }
    }

    if (this.minSequenceNumber_ < 0) {
      // Nothing to sync.
      return;
    }

    shaka.log.debug('Syncing HLS streams against base sequence number:',
        this.minSequenceNumber_);

    for (const streamInfo of streamInfos) {
      const segmentIndex = streamInfo.stream.segmentIndex;
      if (segmentIndex) {
        // Drop any earlier references.
        const numSegmentsToDrop =
            this.minSequenceNumber_ - streamInfo.firstSequenceNumber;
        segmentIndex.dropFirstReferences(numSegmentsToDrop);

        // Now adjust timestamps back to begin at 0.
        const segmentN = segmentIndex.earliestReference();
        if (segmentN) {
          const streamOffset = -segmentN.startTime;
          // Modify all SegmentReferences equally.
          streamInfo.stream.segmentIndex.offset(streamOffset);
          // Update other parts of streamInfo the same way.
          this.offsetStreamInfo_(streamInfo, streamOffset);
        }
      }
    }
  }

  /**
   * Synchronize streams by the EXT-X-PROGRAM-DATE-TIME tags attached to their
   * segments.  Also normalizes segment times so that the earliest segment in
   * any stream is at time 0.
   * @param {!Array.<!shaka.hls.HlsParser.StreamInfo>} streamInfos
   * @private
   */
  syncStreamsWithProgramDateTime_(streamInfos) {
    // We assume that, when this is first called, we have enough info to
    // determine how to use the program date times (e.g. we have both a video
    // and an audio, and all other videos and audios match those).
    // Thus, we only need to calculate this once.
    if (this.lowestSyncTime_ == Infinity) {
      for (const streamInfo of streamInfos) {
        const segmentIndex = streamInfo.stream.segmentIndex;
        goog.asserts.assert(segmentIndex,
            'Only loaded streams should be synced');
        const segment0 = segmentIndex.earliestReference();
        if (segment0 != null && segment0.syncTime != null) {
          this.lowestSyncTime_ =
              Math.min(this.lowestSyncTime_, segment0.syncTime);
        }
      }
    }

    const lowestSyncTime = this.lowestSyncTime_;
    if (lowestSyncTime == Infinity) {
      // Nothing to sync.
      return;
    }

    shaka.log.debug('Syncing HLS streams against base time:', lowestSyncTime);

    for (const streamInfo of this.uriToStreamInfosMap_.values()) {
      const segmentIndex = streamInfo.stream.segmentIndex;
      if (segmentIndex != null) {
        // A segment's startTime should be based on its syncTime vs the lowest
        // syncTime across all streams.  The earliest segment sync time from
        // any stream will become presentation time 0.  If two streams start
        // e.g. 6 seconds apart in syncTime, then their first segments will
        // also start 6 seconds apart in presentation time.

        const segment0 = segmentIndex.earliestReference();
        if (segment0.syncTime == null) {
          shaka.log.alwaysError('Missing EXT-X-PROGRAM-DATE-TIME for stream',
              streamInfo.verbatimMediaPlaylistUri,
              'Expect AV sync issues!');
        } else {
          // Stream metadata are offset by a fixed amount based on the
          // first segment.
          const segment0TargetTime = segment0.syncTime - lowestSyncTime;
          const streamOffset = segment0TargetTime - segment0.startTime;
          this.offsetStreamInfo_(streamInfo, streamOffset);

          // This is computed across all segments separately to manage
          // accumulated drift in durations.
          for (const segment of segmentIndex) {
            segment.syncAgainst(lowestSyncTime);
          }
        }
      }
    }
  }

  /**
   * @param {!shaka.hls.HlsParser.StreamInfo} streamInfo
   * @param {number} offset
   * @private
   */
  offsetStreamInfo_(streamInfo, offset) {
    // Adjust our accounting of the minimum timestamp.
    streamInfo.minTimestamp += offset;

    // Adjust our accounting of the maximum timestamp.
    streamInfo.maxTimestamp += offset;
    goog.asserts.assert(streamInfo.maxTimestamp >= 0,
        'Negative maxTimestamp after adjustment!');

    // Update our map from sequence number to start time.
    const mediaSequenceToStartTime =
        this.getMediaSequenceToStartTimeFor_(streamInfo);
    for (const [key, value] of mediaSequenceToStartTime) {
      mediaSequenceToStartTime.set(key, value + offset);
    }

    shaka.log.debug('Offset', offset, 'applied to',
        streamInfo.verbatimMediaPlaylistUri);
  }

  /**
   * Parses the manifest.
   *
   * @param {BufferSource} data
   * @param {string} uri
   * @return {!Promise}
   * @private
   */
  async parseManifest_(data, uri) {
    const HlsParser = shaka.hls.HlsParser;
    const Utils = shaka.hls.Utils;

    goog.asserts.assert(this.masterPlaylistUri_,
        'Master playlist URI must be set before calling parseManifest_!');

    const playlist = this.manifestTextParser_.parsePlaylist(
        data, this.masterPlaylistUri_);

    /** @type {!Array.<!shaka.hls.Tag>} */
    const variablesTags = Utils.filterTagsByName(playlist.tags, 'EXT-X-DEFINE');

    this.parseMasterVariables_(variablesTags);

    /** @type {!Array.<!shaka.extern.Variant>} */
    let variants = [];
    /** @type {!Array.<!shaka.extern.Stream>} */
    let textStreams = [];
    /** @type {!Array.<!shaka.extern.Stream>} */
    let imageStreams = [];

    // Parsing a media playlist results in a single-variant stream.
    if (playlist.type == shaka.hls.PlaylistType.MEDIA) {
      // Get necessary info for this stream, from the config. These are things
      // we would normally find from the master playlist (e.g. from values on
      // EXT-X-MEDIA tags).
      let fullMimeType = this.config_.hls.mediaPlaylistFullMimeType;
      // Try to infer the full mimetype better.
      if (playlist.segments.length) {
        const parsedUri = new goog.Uri(playlist.segments[0].absoluteUri);
        const extension = parsedUri.getPath().split('.').pop();
        let mimeType = HlsParser.RAW_FORMATS_TO_MIME_TYPES_[extension];
        if (mimeType) {
          fullMimeType = mimeType;
        } else if (extension === 'ts') {
          // TODO: Fetch one segment a use the TsParser to analize if there is
          // video, audio or both.
        } else if (extension === 'mp4') {
          // TODO: Fetch one segment a use the Mp4Parser to analize if there is
          // video, audio or both.
        } else if (HlsParser.AUDIO_EXTENSIONS_TO_MIME_TYPES_[extension]) {
          mimeType = HlsParser.AUDIO_EXTENSIONS_TO_MIME_TYPES_[extension];
          const defaultAudioCodec = this.config_.hls.defaultAudioCodec;
          fullMimeType = `${mimeType}; codecs="${defaultAudioCodec}"`;
        } else if (HlsParser.VIDEO_EXTENSIONS_TO_MIME_TYPES_[extension]) {
          mimeType = HlsParser.VIDEO_EXTENSIONS_TO_MIME_TYPES_[extension];
          const defaultVideoCodec = this.config_.hls.defaultVideoCodec;
          fullMimeType = `${mimeType}; codecs="${defaultVideoCodec}"`;
        }
      }

      const mimeType = shaka.util.MimeUtils.getBasicType(fullMimeType);
      const type = mimeType.split('/')[0];
      const codecs = shaka.util.MimeUtils.getCodecs(fullMimeType);

      // Some values we cannot figure out, and aren't important enough to ask
      // the user to provide through config values. A lot of these are only
      // relevant to ABR, which isn't necessary if there's only one variant.
      // So these unknowns should be set to false or null, largely.
      const language = '';
      const channelsCount = null;
      const spatialAudio = false;
      const characteristics = null;
      const closedCaptions = new Map();
      const forced = false; // Only relevant for text.
      const primary = true; // This is the only stream!
      const name = 'Media Playlist';

      // Make the stream info, with those values.
      const streamInfo = await this.convertParsedPlaylistIntoStreamInfo_(
          playlist, uri, uri, codecs, type, language, primary, name,
          channelsCount, closedCaptions, characteristics, forced, spatialAudio,
          mimeType);
      this.uriToStreamInfosMap_.set(uri, streamInfo);

      // Wrap the stream from that stream info with a variant.
      variants.push({
        id: 0,
        language: 'und',
        disabledUntilTime: 0,
        primary: true,
        audio: type == 'audio' ? streamInfo.stream : null,
        video: type == 'video' ? streamInfo.stream : null,
        bandwidth: 0,
        allowedByApplication: true,
        allowedByKeySystem: true,
        decodingInfos: [],
      });
    } else {
      /** @type {!Array.<!shaka.hls.Tag>} */
      const mediaTags = Utils.filterTagsByName(playlist.tags, 'EXT-X-MEDIA');
      /** @type {!Array.<!shaka.hls.Tag>} */
      const variantTags = Utils.filterTagsByName(
          playlist.tags, 'EXT-X-STREAM-INF');
      /** @type {!Array.<!shaka.hls.Tag>} */
      const imageTags = Utils.filterTagsByName(
          playlist.tags, 'EXT-X-IMAGE-STREAM-INF');
      /** @type {!Array.<!shaka.hls.Tag>} */
      const sessionKeyTags = Utils.filterTagsByName(
          playlist.tags, 'EXT-X-SESSION-KEY');

      this.parseCodecs_(variantTags);

      /** @type {!Array.<!shaka.hls.Tag>} */
      const sesionDataTags =
          Utils.filterTagsByName(playlist.tags, 'EXT-X-SESSION-DATA');
      for (const tag of sesionDataTags) {
        const id = tag.getAttributeValue('DATA-ID');
        const uri = tag.getAttributeValue('URI');
        const language = tag.getAttributeValue('LANGUAGE');
        const value = tag.getAttributeValue('VALUE');
        const data = (new Map()).set('id', id);
        if (uri) {
          data.set('uri', shaka.hls.Utils.constructAbsoluteUri(
              this.masterPlaylistUri_, uri));
        }
        if (language) {
          data.set('language', language);
        }
        if (value) {
          data.set('value', value);
        }
        const event = new shaka.util.FakeEvent('sessiondata', data);
        if (this.playerInterface_) {
          this.playerInterface_.onEvent(event);
        }
      }

      // Parse audio and video media tags first, so that we can extract segment
      // start time from audio/video streams and reuse for text streams.
      this.createStreamInfosFromMediaTags_(mediaTags);
      this.parseClosedCaptions_(mediaTags);
      variants = this.createVariantsForTags_(variantTags, sessionKeyTags);
      textStreams = this.parseTexts_(mediaTags);
      imageStreams = await this.parseImages_(imageTags);
    }

    // Make sure that the parser has not been destroyed.
    if (!this.playerInterface_) {
      throw new shaka.util.Error(
          shaka.util.Error.Severity.CRITICAL,
          shaka.util.Error.Category.PLAYER,
          shaka.util.Error.Code.OPERATION_ABORTED);
    }

    // This assert is our own sanity check.
    goog.asserts.assert(this.presentationTimeline_ == null,
        'Presentation timeline created early!');
    // We don't know if the presentation is VOD or live until we parse at least
    // one media playlist, so make a VOD-style presentation timeline for now
    // and change the type later if we discover this is live.
    // Since the player will load the first variant chosen early in the process,
    // there isn't a window during playback where the live-ness is unknown.
    this.presentationTimeline_ = new shaka.media.PresentationTimeline(
        /* presentationStartTime= */ null, /* delay= */ 0);
    this.presentationTimeline_.setStatic(true);

    // Single-variant streams aren't lazy-loaded, so for them we already have
    // enough info here to determine the presentation type and duration.
    if (playlist.type == shaka.hls.PlaylistType.MEDIA) {
      if (this.isLive_()) {
        this.changePresentationTimelineToLive_();
        const delay = this.updatePlaylistDelay_;
        this.updatePlaylistTimer_.tickAfter(/* seconds= */ delay);
      }
      const streamInfos = Array.from(this.uriToStreamInfosMap_.values());
      this.finalizeStreams_(streamInfos);
      this.determineDuration_();
    }

    this.manifest_ = {
      presentationTimeline: this.presentationTimeline_,
      variants,
      textStreams,
      imageStreams,
      offlineSessionIds: [],
      minBufferTime: 0,
      sequenceMode: true,
    };
    this.playerInterface_.makeTextStreamsForClosedCaptions(this.manifest_);
  }

  /** @private */
  determineDuration_() {
    goog.asserts.assert(this.presentationTimeline_,
        'Presentation timeline not created!');

    if (this.isLive_()) {
      // The HLS spec (RFC 8216) states in 6.3.4:
      // "the client MUST wait for at least the target duration before
      // attempting to reload the Playlist file again".
      // For LL-HLS, the server must add a new partial segment to the Playlist
      // every part target duration.
      this.updatePlaylistDelay_ = this.minTargetDuration_;

      // The spec says nothing much about seeking in live content, but Safari's
      // built-in HLS implementation does not allow it.  Therefore we will set
      // the availability window equal to the presentation delay.  The player
      // will be able to buffer ahead three segments, but the seek window will
      // be zero-sized.
      const PresentationType = shaka.hls.HlsParser.PresentationType_;

      if (this.presentationType_ == PresentationType.LIVE) {
        let segmentAvailabilityDuration = this.getLiveDuration_();

        // This defaults to the presentation delay, which has the effect of
        // making the live stream unseekable.  This is consistent with Apple's
        // HLS implementation.
        if (this.config_.hls.useSafariBehaviorForLive) {
          segmentAvailabilityDuration = this.presentationTimeline_.getDelay();
        }

        // The app can override that with a longer duration, to allow seeking.
        if (!isNaN(this.config_.availabilityWindowOverride)) {
          segmentAvailabilityDuration = this.config_.availabilityWindowOverride;
        }

        this.presentationTimeline_.setSegmentAvailabilityDuration(
            segmentAvailabilityDuration);
      }
    } else {
      // Use the minimum duration as the presentation duration.
      this.presentationTimeline_.setDuration(this.getMinDuration_());
    }

    // This is the first point where we have a meaningful presentation start
    // time, and we need to tell PresentationTimeline that so that it can
    // maintain consistency from here on.
    this.presentationTimeline_.lockStartTime();

    // This asserts that the live edge is being calculated from segment times.
    // For VOD and event streams, this check should still pass.
    goog.asserts.assert(
        !this.presentationTimeline_.usingPresentationStartTime(),
        'We should not be using the presentation start time in HLS!');
  }

  /**
   * Get the variables of each variant tag, and store in a map.
   * @param {!Array.<!shaka.hls.Tag>} tags Variant tags from the playlist.
   * @private
   */
  parseMasterVariables_(tags) {
    for (const variableTag of tags) {
      const name = variableTag.getAttributeValue('NAME');
      const value = variableTag.getAttributeValue('VALUE');
      if (name && value) {
        if (!this.globalVariables_.has(name)) {
          this.globalVariables_.set(name, value);
        }
      }
    }
  }

  /**
   * Get the variables of each variant tag, and store in a map.
   * @param {!Array.<!shaka.hls.Tag>} tags Variant tags from the playlist.
   * @return {!Map.<string, string>}
   * @private
   */
  parseMediaVariables_(tags) {
    const mediaVariables = new Map();
    for (const variableTag of tags) {
      const name = variableTag.getAttributeValue('NAME');
      const value = variableTag.getAttributeValue('VALUE');
      const mediaImport = variableTag.getAttributeValue('IMPORT');
      if (name && value) {
        mediaVariables.set(name, value);
      }
      if (mediaImport) {
        const globalValue = this.globalVariables_.get(mediaImport);
        if (globalValue) {
          mediaVariables.set(mediaImport, globalValue);
        }
      }
    }
    return mediaVariables;
  }

  /**
   * Get the codecs of each variant tag, and store in a map from
   * audio/video/subtitle group id to the codecs arraylist.
   * @param {!Array.<!shaka.hls.Tag>} tags Variant tags from the playlist.
   * @private
   */
  parseCodecs_(tags) {
    const ContentType = shaka.util.ManifestParserUtils.ContentType;

    for (const variantTag of tags) {
      const audioGroupId = variantTag.getAttributeValue('AUDIO');
      const videoGroupId = variantTag.getAttributeValue('VIDEO');
      const subGroupId = variantTag.getAttributeValue('SUBTITLES');
      const allCodecs = this.getCodecsForVariantTag_(variantTag);

      if (subGroupId) {
        const textCodecs = shaka.util.ManifestParserUtils.guessCodecsSafe(
            ContentType.TEXT, allCodecs);
        goog.asserts.assert(textCodecs != null, 'Text codecs should be valid.');
        this.groupIdToCodecsMap_.set(subGroupId, textCodecs);
        shaka.util.ArrayUtils.remove(allCodecs, textCodecs);
      }
      if (audioGroupId) {
        let codecs = shaka.util.ManifestParserUtils.guessCodecsSafe(
            ContentType.AUDIO, allCodecs);
        if (!codecs) {
          codecs = this.config_.hls.defaultAudioCodec;
        }
        this.groupIdToCodecsMap_.set(audioGroupId, codecs);
      }
      if (videoGroupId) {
        let codecs = shaka.util.ManifestParserUtils.guessCodecsSafe(
            ContentType.VIDEO, allCodecs);
        if (!codecs) {
          codecs = this.config_.hls.defaultVideoCodec;
        }
        this.groupIdToCodecsMap_.set(videoGroupId, codecs);
      }
    }
  }

  /**
   * Parse Subtitles and Closed Captions from 'EXT-X-MEDIA' tags.
   * Create text streams for Subtitles, but not Closed Captions.
   *
   * @param {!Array.<!shaka.hls.Tag>} mediaTags Media tags from the playlist.
   * @return {!Array.<!shaka.extern.Stream>}
   * @private
   */
  parseTexts_(mediaTags) {
    // Create text stream for each Subtitle media tag.
    const subtitleTags =
        shaka.hls.Utils.filterTagsByType(mediaTags, 'SUBTITLES');
    const textStreams = subtitleTags.map((tag) => {
      const disableText = this.config_.disableText;
      if (disableText) {
        return null;
      }
      try {
        return this.createStreamInfoFromMediaTag_(tag).stream;
      } catch (e) {
        if (this.config_.hls.ignoreTextStreamFailures) {
          return null;
        }
        throw e;
      }
    });

    const type = shaka.util.ManifestParserUtils.ContentType.TEXT;

    // Set the codecs for text streams.
    for (const tag of subtitleTags) {
      const groupId = tag.getRequiredAttrValue('GROUP-ID');
      const codecs = this.groupIdToCodecsMap_.get(groupId);
      if (codecs) {
        const textStreamInfos = this.groupIdToStreamInfosMap_.get(groupId);
        if (textStreamInfos) {
          for (const textStreamInfo of textStreamInfos) {
            textStreamInfo.stream.codecs = codecs;
            textStreamInfo.stream.mimeType =
                this.guessMimeTypeBeforeLoading_(type, codecs) ||
                this.guessMimeTypeFallback_(type);
          }
        }
      }
    }

    // Do not create text streams for Closed captions.
    return textStreams.filter((s) => s);
  }

  /**
   * @param {!Array.<!shaka.hls.Tag>} imageTags from the playlist.
   * @return {!Promise.<!Array.<!shaka.extern.Stream>>}
   * @private
   */
  async parseImages_(imageTags) {
    // Create image stream for each image tag.
    const imageStreamPromises = imageTags.map(async (tag) => {
      const disableThumbnails = this.config_.disableThumbnails;
      if (disableThumbnails) {
        return null;
      }
      try {
        const streamInfo = await this.createStreamInfoFromImageTag_(tag);
        return streamInfo.stream;
      } catch (e) {
        if (this.config_.hls.ignoreImageStreamFailures) {
          return null;
        }
        throw e;
      }
    });
    const imageStreams = await Promise.all(imageStreamPromises);
    return imageStreams.filter((s) => s);
  }

  /**
   * @param {!Array.<!shaka.hls.Tag>} mediaTags Media tags from the playlist.
   * @private
   */
  createStreamInfosFromMediaTags_(mediaTags) {
    // Filter out subtitles and  media tags without uri.
    mediaTags = mediaTags.filter((tag) => {
      const uri = tag.getAttributeValue('URI') || '';
      const type = tag.getAttributeValue('TYPE');
      return type != 'SUBTITLES' && uri != '';
    });

    // Create stream info for each audio / video media tag.
    for (const tag of mediaTags) {
      this.createStreamInfoFromMediaTag_(tag);
    }
  }

  /**
   * @param {!Array.<!shaka.hls.Tag>} tags Variant tags from the playlist.
   * @param {!Array.<!shaka.hls.Tag>} sessionKeyTags EXT-X-SESSION-KEY tags
   * from the playlist.
   * @return {!Array.<!shaka.extern.Variant>}
   * @private
   */
  createVariantsForTags_(tags, sessionKeyTags) {
    // EXT-X-SESSION-KEY processing
    const drmInfos = [];
    const keyIds = new Set();
    if (sessionKeyTags.length > 0) {
      for (const drmTag of sessionKeyTags) {
        const method = drmTag.getRequiredAttrValue('METHOD');
        if (method != 'NONE' && method != 'AES-128') {
          // According to the HLS spec, KEYFORMAT is optional and implicitly
          // defaults to "identity".
          // https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis-11#section-4.4.4.4
          const keyFormat =
              drmTag.getAttributeValue('KEYFORMAT') || 'identity';
          const drmParser =
              shaka.hls.HlsParser.KEYFORMATS_TO_DRM_PARSERS_[keyFormat];

          const drmInfo = drmParser ?
              drmParser(drmTag, /* mimeType= */ '') : null;
          if (drmInfo) {
            if (drmInfo.keyIds) {
              for (const keyId of drmInfo.keyIds) {
                keyIds.add(keyId);
              }
            }
            drmInfos.push(drmInfo);
          } else {
            shaka.log.warning('Unsupported HLS KEYFORMAT', keyFormat);
          }
        }
      }
    }

    // Create variants for each variant tag.
    const allVariants = tags.map((tag) => {
      const frameRate = tag.getAttributeValue('FRAME-RATE');
      const bandwidth = Number(tag.getAttributeValue('AVERAGE-BANDWIDTH')) ||
        Number(tag.getRequiredAttrValue('BANDWIDTH'));

      const resolution = tag.getAttributeValue('RESOLUTION');
      const [width, height] = resolution ? resolution.split('x') : [null, null];

      const videoRange = tag.getAttributeValue('VIDEO-RANGE');

      const streamInfos = this.createStreamInfosForVariantTag_(tag,
          resolution, frameRate);

      goog.asserts.assert(streamInfos.audio.length ||
          streamInfos.video.length, 'We should have created a stream!');

      return this.createVariants_(
          streamInfos.audio,
          streamInfos.video,
          bandwidth,
          width,
          height,
          frameRate,
          videoRange,
          drmInfos,
          keyIds);
    });
    let variants = allVariants.reduce(shaka.util.Functional.collapseArrays, []);
    // Filter out null variants.
    variants = variants.filter((variant) => variant != null);
    return variants;
  }

  /**
   * Create audio and video streamInfos from an 'EXT-X-STREAM-INF' tag and its
   * related media tags.
   *
   * @param {!shaka.hls.Tag} tag
   * @param {?string} resolution
   * @param {?string} frameRate
   * @return {!shaka.hls.HlsParser.StreamInfos}
   * @private
   */
  createStreamInfosForVariantTag_(tag, resolution, frameRate) {
    const ContentType = shaka.util.ManifestParserUtils.ContentType;
    /** @type {!Array.<string>} */
    let allCodecs = this.getCodecsForVariantTag_(tag);
    const audioGroupId = tag.getAttributeValue('AUDIO');
    const videoGroupId = tag.getAttributeValue('VIDEO');
    goog.asserts.assert(audioGroupId == null || videoGroupId == null,
        'Unexpected: both video and audio described by media tags!');

    const groupId = audioGroupId || videoGroupId;
    const streamInfos =
        (groupId && this.groupIdToStreamInfosMap_.has(groupId)) ?
        this.groupIdToStreamInfosMap_.get(groupId) : [];

    /** @type {shaka.hls.HlsParser.StreamInfos} */
    const res = {
      audio: audioGroupId ? streamInfos : [],
      video: videoGroupId ? streamInfos : [],
    };

    // Make an educated guess about the stream type.
    shaka.log.debug('Guessing stream type for', tag.toString());
    let type;
    let ignoreStream = false;

    // The Microsoft HLS manifest generators will make audio-only variants
    // that link to their URI both directly and through an audio tag.
    // In that case, ignore the local URI and use the version in the
    // AUDIO tag, so you inherit its language.
    // As an example, see the manifest linked in issue #860.
    const streamURI = tag.getRequiredAttrValue('URI');
    const hasSameUri = res.audio.find((audio) => {
      return audio && audio.verbatimMediaPlaylistUri == streamURI;
    });

    const videoCodecs = shaka.util.ManifestParserUtils.guessCodecsSafe(
        ContentType.VIDEO, allCodecs);
    const audioCodecs = shaka.util.ManifestParserUtils.guessCodecsSafe(
        ContentType.AUDIO, allCodecs);

    if (audioCodecs && !videoCodecs) {
      // There are no associated media tags, and there's only audio codec,
      // and no video codec, so it should be audio.
      type = ContentType.AUDIO;
      shaka.log.debug('Guessing audio-only.');
    } else if (!streamInfos.length && audioCodecs && videoCodecs) {
      // There are both audio and video codecs, so assume multiplexed content.
      // Note that the default used when CODECS is missing assumes multiple
      // (and therefore multiplexed).
      // Recombine the codec strings into one so that MediaSource isn't
      // lied to later. (That would trigger an error in Chrome.)
      shaka.log.debug('Guessing multiplexed audio+video.');
      type = ContentType.VIDEO;
      allCodecs = [[videoCodecs, audioCodecs].join(',')];
    } else if (res.audio.length && hasSameUri) {
      shaka.log.debug('Guessing audio-only.');
      type = ContentType.AUDIO;
      ignoreStream = true;
    } else if (res.video.length && !res.audio.length) {
      // There are associated video streams.  Assume this is audio.
      shaka.log.debug('Guessing audio-only.');
      type = ContentType.AUDIO;
    } else {
      shaka.log.debug('Guessing video-only.');
      type = ContentType.VIDEO;
    }

    if (!ignoreStream) {
      const streamInfo =
          this.createStreamInfoFromVariantTag_(tag, allCodecs, type);
      res[streamInfo.stream.type] = [streamInfo];
    }
    return res;
  }


  /**
   * Get the codecs from the 'EXT-X-STREAM-INF' tag.
   *
   * @param {!shaka.hls.Tag} tag
   * @return {!Array.<string>} codecs
   * @private
   */
  getCodecsForVariantTag_(tag) {
    // These are the default codecs to assume if none are specified.
    const defaultCodecsArray = [];
    if (!this.config_.disableVideo) {
      defaultCodecsArray.push(this.config_.hls.defaultVideoCodec);
    }
    if (!this.config_.disableAudio) {
      defaultCodecsArray.push(this.config_.hls.defaultAudioCodec);
    }
    const defaultCodecs = defaultCodecsArray.join(',');

    const codecsString = tag.getAttributeValue('CODECS', defaultCodecs);
    // Strip out internal whitespace while splitting on commas:
    /** @type {!Array.<string>} */
    const codecs = codecsString.split(/\s*,\s*/);

    // Filter out duplicate codecs.
    const seen = new Set();
    const ret = [];
    for (const codec of codecs) {
      // HLS says the CODECS field needs to include all codecs that appear in
      // the content. This means that if the content changes profiles, it should
      // include both. Since all known browsers support changing profiles
      // without any other work, just ignore them.  See also:
      // https://github.com/shaka-project/shaka-player/issues/1817
      const shortCodec = shaka.util.MimeUtils.getCodecBase(codec);
      if (!seen.has(shortCodec)) {
        ret.push(codec);
        seen.add(shortCodec);
      } else {
        shaka.log.debug('Ignoring duplicate codec');
      }
    }
    return ret;
  }

  /**
   * Get the channel count information for an HLS audio track.
   * CHANNELS specifies an ordered, "/" separated list of parameters.
   * If the type is audio, the first parameter will be a decimal integer
   * specifying the number of independent, simultaneous audio channels.
   * No other channels parameters are currently defined.
   *
   * @param {!shaka.hls.Tag} tag
   * @return {?number}
   * @private
   */
  getChannelsCount_(tag) {
    const channels = tag.getAttributeValue('CHANNELS');
    if (!channels) {
      return null;
    }
    const channelcountstring = channels.split('/')[0];
    const count = parseInt(channelcountstring, 10);
    return count;
  }

  /**
   * Get the spatial audio information for an HLS audio track.
   * In HLS the channels field indicates the number of audio channels that the
   * stream has (eg: 2). In the case of Dolby Atmos, the complexity is
   * expressed with the number of channels followed by the word JOC
   * (eg: 16/JOC), so 16 would be the number of channels (eg: 7.3.6 layout),
   * and JOC indicates that the stream has spatial audio.
   * @see https://developer.apple.com/documentation/http_live_streaming/hls_authoring_specification_for_apple_devices/hls_authoring_specification_for_apple_devices_appendixes
   *
   * @param {!shaka.hls.Tag} tag
   * @return {boolean}
   * @private
   */
  isSpatialAudio_(tag) {
    const channels = tag.getAttributeValue('CHANNELS');
    if (!channels) {
      return false;
    }
    return channels.includes('/JOC');
  }

  /**
   * Get the closed captions map information for the EXT-X-STREAM-INF tag, to
   * create the stream info.
   * @param {!shaka.hls.Tag} tag
   * @param {string} type
   * @return {Map.<string, string>} closedCaptions
   * @private
   */
  getClosedCaptions_(tag, type) {
    const ContentType = shaka.util.ManifestParserUtils.ContentType;
    // The attribute of closed captions is optional, and the value may be
    // 'NONE'.
    const closedCaptionsAttr = tag.getAttributeValue('CLOSED-CAPTIONS');

    // EXT-X-STREAM-INF tags may have CLOSED-CAPTIONS attributes.
    // The value can be either a quoted-string or an enumerated-string with
    // the value NONE. If the value is a quoted-string, it MUST match the
    // value of the GROUP-ID attribute of an EXT-X-MEDIA tag elsewhere in the
    // Playlist whose TYPE attribute is CLOSED-CAPTIONS.
    if (type == ContentType.VIDEO && closedCaptionsAttr &&
    closedCaptionsAttr != 'NONE') {
      return this.groupIdToClosedCaptionsMap_.get(closedCaptionsAttr);
    }
    return null;
  }

  /**
   * Get the language value.
   *
   * @param {!shaka.hls.Tag} tag
   * @return {string}
   * @private
   */
  getLanguage_(tag) {
    const LanguageUtils = shaka.util.LanguageUtils;
    const languageValue = tag.getAttributeValue('LANGUAGE') || 'und';
    return LanguageUtils.normalize(languageValue);
  }

  /**
   * Get the type value.
   * Shaka recognizes the content types 'audio', 'video', 'text', and 'image'.
   * The HLS 'subtitles' type needs to be mapped to 'text'.
   * @param {!shaka.hls.Tag} tag
   * @return {string}
   * @private
   */
  getType_(tag) {
    let type = tag.getRequiredAttrValue('TYPE').toLowerCase();
    if (type == 'subtitles') {
      type = shaka.util.ManifestParserUtils.ContentType.TEXT;
    }
    return type;
  }

  /**
   * @param {!Array.<shaka.hls.HlsParser.StreamInfo>} audioInfos
   * @param {!Array.<shaka.hls.HlsParser.StreamInfo>} videoInfos
   * @param {number} bandwidth
   * @param {?string} width
   * @param {?string} height
   * @param {?string} frameRate
   * @param {?string} videoRange
   * @param {!Array.<shaka.extern.DrmInfo>} drmInfos
   * @param {!Set.<string>} keyIds
   * @return {!Array.<!shaka.extern.Variant>}
   * @private
   */
  createVariants_(
      audioInfos, videoInfos, bandwidth, width, height, frameRate, videoRange,
      drmInfos, keyIds) {
    const ContentType = shaka.util.ManifestParserUtils.ContentType;
    const DrmEngine = shaka.media.DrmEngine;

    for (const info of videoInfos) {
      this.addVideoAttributes_(
          info.stream, width, height, frameRate, videoRange);
    }

    // In case of audio-only or video-only content or the audio/video is
    // disabled by the config, we create an array of one item containing
    // a null. This way, the double-loop works for all kinds of content.
    // NOTE: we currently don't have support for audio-only content.
    const disableAudio = this.config_.disableAudio;
    if (!audioInfos.length || disableAudio) {
      audioInfos = [null];
    }
    const disableVideo = this.config_.disableVideo;
    if (!videoInfos.length || disableVideo) {
      videoInfos = [null];
    }

    const variants = [];
    for (const audioInfo of audioInfos) {
      for (const videoInfo of videoInfos) {
        const audioStream = audioInfo ? audioInfo.stream : null;
        if (audioStream) {
          audioStream.drmInfos = drmInfos;
          audioStream.keyIds = keyIds;
        }
        const videoStream = videoInfo ? videoInfo.stream : null;
        if (videoStream) {
          videoStream.drmInfos = drmInfos;
          videoStream.keyIds = keyIds;
        }
        const audioDrmInfos