videojs-contrib-hls/test/master-playlist-controller.test.js

Play back HLS with video.js, even where it's not natively supported

import QUnit from 'qunit';
import videojs from 'video.js';
import {
  useFakeEnvironment,
  useFakeMediaSource,
  createPlayer,
  standardXHRResponse,
  openMediaSource
} from './test-helpers.js';
import manifests from './test-manifests.js';
import {
  MasterPlaylistController,
  mimeTypesForPlaylist_,
  mapLegacyAvcCodecs_
} from '../src/master-playlist-controller';
/* eslint-disable no-unused-vars */
// we need this so that it can register hls with videojs
import { Hls } from '../src/videojs-contrib-hls';
/* eslint-enable no-unused-vars */
import Playlist from '../src/playlist';
import Config from '../src/config';

const generateMedia = function(isMaat, isMuxed, hasVideoCodec, hasAudioCodec, isFMP4) {
  const codec = (hasVideoCodec ? 'avc1.deadbeef' : '') +
    (hasVideoCodec && hasAudioCodec ? ',' : '') +
    (hasAudioCodec ? 'mp4a.40.E' : '');
  const master = {
    mediaGroups: {},
    playlists: []
  };
  const media = {
    attributes: {}
  };

  if (isMaat) {
    master.mediaGroups.AUDIO = {
      test: {
        demuxed: {
          uri: 'foo.bar'
        }
      }
    };

    if (isMuxed) {
      master.mediaGroups.AUDIO.test.muxed = {};
    }
    media.attributes.AUDIO = 'test';
  }

  if (isFMP4) {
    // This is not a great way to signal that the playlist is fmp4 but
    // this is how we currently detect it in HLS so let's emulate it here
    media.segments = [
      {
        map: 'test'
      }
    ];
  }

  if (hasVideoCodec || hasAudioCodec) {
    media.attributes.CODECS = codec;
  }

  return [master, media];
};

QUnit.module('MasterPlaylistController', {
  beforeEach(assert) {
    this.env = useFakeEnvironment(assert);
    this.clock = this.env.clock;
    this.requests = this.env.requests;
    this.mse = useFakeMediaSource();

    // force the HLS tech to run
    this.origSupportsNativeHls = videojs.Hls.supportsNativeHls;
    videojs.Hls.supportsNativeHls = false;
    this.oldBrowser = videojs.browser;
    videojs.browser = videojs.mergeOptions({}, videojs.browser);
    this.player = createPlayer();
    this.player.src({
      src: 'manifest/master.m3u8',
      type: 'application/vnd.apple.mpegurl'
    });

    this.clock.tick(1);

    this.standardXHRResponse = (request, data) => {
      standardXHRResponse(request, data);

      // Because SegmentLoader#fillBuffer_ is now scheduled asynchronously
      // we have to use clock.tick to get the expected side effects of
      // SegmentLoader#handleUpdateEnd_
      this.clock.tick(1);
    };

    this.masterPlaylistController = this.player.tech_.hls.masterPlaylistController_;

    // Make segment metadata noop since most test segments dont have real data
    this.masterPlaylistController.mainSegmentLoader_.addSegmentMetadataCue_ = () => {};
  },
  afterEach() {
    this.env.restore();
    this.mse.restore();
    videojs.Hls.supportsNativeHls = this.origSupportsNativeHls;
    videojs.browser = this.oldBrowser;
    this.player.dispose();
  }
});

QUnit.test('throws error when given an empty URL', function(assert) {
  let options = {
    url: 'test',
    tech: this.player.tech_
  };

  assert.ok(new MasterPlaylistController(options), 'can create with options');

  options.url = '';
  assert.throws(() => {
    new MasterPlaylistController(options); // eslint-disable-line no-new
  }, /A non-empty playlist URL is required/, 'requires a non empty url');
});

QUnit.test('obeys none preload option', function(assert) {
  this.player.preload('none');
  // master
  this.standardXHRResponse(this.requests.shift());
  // playlist
  this.standardXHRResponse(this.requests.shift());

  openMediaSource(this.player, this.clock);

  assert.equal(this.requests.length, 0, 'no segment requests');

  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
});

QUnit.test('passes options to PlaylistLoader', function(assert) {
  const options = {
    url: 'test',
    tech: this.player.tech_
  };

  let controller = new MasterPlaylistController(options);

  assert.notOk(controller.masterPlaylistLoader_.withCredentials, 'credentials wont be sent by default');
  assert.notOk(controller.masterPlaylistLoader_.handleManifestRedirects, 'redirects are ignored by default');

  controller = new MasterPlaylistController(Object.assign({
    withCredentials: true,
    handleManifestRedirects: true
  }, options));

  assert.ok(controller.masterPlaylistLoader_.withCredentials, 'withCredentials enabled');
  assert.ok(controller.masterPlaylistLoader_.handleManifestRedirects, 'handleManifestRedirects enabled');
});

QUnit.test('obeys auto preload option', function(assert) {
  this.player.preload('auto');
  // master
  this.standardXHRResponse(this.requests.shift());
  // playlist
  this.standardXHRResponse(this.requests.shift());

  openMediaSource(this.player, this.clock);

  assert.equal(this.requests.length, 1, '1 segment request');

  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
});

QUnit.test('obeys metadata preload option', function(assert) {
  this.player.preload('metadata');
  // master
  this.standardXHRResponse(this.requests.shift());
  // playlist
  this.standardXHRResponse(this.requests.shift());

  openMediaSource(this.player, this.clock);

  assert.equal(this.requests.length, 1, '1 segment request');

  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
});

QUnit.test('resets SegmentLoader when seeking in flash for both in and out of buffer',
  function(assert) {
    let resets = 0;

    // master
    this.standardXHRResponse(this.requests.shift());
    // media
    this.standardXHRResponse(this.requests.shift());
    this.masterPlaylistController.mediaSource.trigger('sourceopen');

    let mpc = this.masterPlaylistController;
    let segmentLoader = mpc.mainSegmentLoader_;

    segmentLoader.resetEverything = function() {
      resets++;
    };

    let buffered;

    mpc.tech_.buffered = function() {
      return buffered;
    };

    buffered = videojs.createTimeRanges([[0, 20]]);
    mpc.mode_ = 'html5';

    mpc.setCurrentTime(10);
    assert.equal(resets, 0,
      'does not reset loader when seeking into a buffered region in html5');

    mpc.setCurrentTime(21);
    assert.equal(resets, 1,
      'does reset loader when seeking outside of the buffered region in html5');

    mpc.mode_ = 'flash';

    mpc.setCurrentTime(10);
    assert.equal(resets, 2,
      'does reset loader when seeking into a buffered region in flash');

    mpc.setCurrentTime(21);
    assert.equal(resets, 3,
      'does reset loader when seeking outside of the buffered region in flash');

  });

QUnit.test('selects lowest bitrate rendition when enableLowInitialPlaylist is set',
  function(assert) {
    // Set requests.length to 0, otherwise it will use the requests generated in the
    // beforeEach function
    this.requests.length = 0;
    this.player = createPlayer({ html5: { hls: { enableLowInitialPlaylist: true } } });

    this.player.src({
      src: 'manifest/master.m3u8',
      type: 'application/vnd.apple.mpegurl'
    });

    this.clock.tick(1);

    this.masterPlaylistController = this.player.tech_.hls.masterPlaylistController_;

    let numCallsToSelectInitialPlaylistCalls = 0;
    let numCallsToSelectPlaylist = 0;

    this.masterPlaylistController.selectPlaylist = () => {
      numCallsToSelectPlaylist++;
      return this.masterPlaylistController.master().playlists[0];
    };

    this.masterPlaylistController.selectInitialPlaylist = () => {
      numCallsToSelectInitialPlaylistCalls++;
      return this.masterPlaylistController.master().playlists[0];
    };

    this.masterPlaylistController.mediaSource.trigger('sourceopen');
    // master
    this.standardXHRResponse(this.requests.shift());
    // media
    this.standardXHRResponse(this.requests.shift());

    this.clock.tick(1);

    assert.equal(numCallsToSelectInitialPlaylistCalls, 1, 'selectInitialPlaylist');
    assert.equal(numCallsToSelectPlaylist, 0, 'selectPlaylist');

    // Simulate a live reload
    this.masterPlaylistController.masterPlaylistLoader_.trigger('loadedplaylist');

    assert.equal(numCallsToSelectInitialPlaylistCalls, 1, 'selectInitialPlaylist');
    assert.equal(numCallsToSelectPlaylist, 0, 'selectPlaylist');
  });

QUnit.test('resyncs SegmentLoader for a fast quality change', function(assert) {
  let resyncs = 0;

  this.masterPlaylistController.mediaSource.trigger('sourceopen');
  // master
  this.standardXHRResponse(this.requests.shift());
  // media
  this.standardXHRResponse(this.requests.shift());

  let segmentLoader = this.masterPlaylistController.mainSegmentLoader_;

  segmentLoader.resyncLoader = function() {
    resyncs++;
  };

  this.masterPlaylistController.selectPlaylist = () => {
    return this.masterPlaylistController.master().playlists[0];
  };

  this.masterPlaylistController.fastQualityChange_();

  assert.equal(resyncs, 1, 'resynced the segmentLoader');

  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
});

QUnit.test('does not resync the segmentLoader when no fast quality change occurs',
  function(assert) {
    let resyncs = 0;

    // master
    this.standardXHRResponse(this.requests.shift());
    // media
    this.standardXHRResponse(this.requests.shift());
    this.masterPlaylistController.mediaSource.trigger('sourceopen');

    let segmentLoader = this.masterPlaylistController.mainSegmentLoader_;

    segmentLoader.resyncLoader = function() {
      resyncs++;
    };

    this.masterPlaylistController.fastQualityChange_();

    assert.equal(resyncs, 0, 'did not resync the segmentLoader');
    // verify stats
    assert.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
  });

QUnit.test('fast quality change resyncs audio segment loader', function(assert) {
  this.requests.length = 0;
  this.player = createPlayer();
  this.player.src({
    src: 'alternate-audio-multiple-groups.m3u8',
    type: 'application/vnd.apple.mpegurl'
  });

  this.clock.tick(1);

  const masterPlaylistController = this.player.tech_.hls.masterPlaylistController_;

  masterPlaylistController.selectPlaylist = () => {
    return masterPlaylistController.master().playlists[0];
  };

  // master
  this.standardXHRResponse(this.requests.shift());
  // media
  this.standardXHRResponse(this.requests.shift());

  masterPlaylistController.mediaSource.trigger('sourceopen');

  this.player.audioTracks()[0].enabled = true;

  let resyncs = 0;
  let resets = 0;
  let realReset = masterPlaylistController.audioSegmentLoader_.resetLoader;

  masterPlaylistController.audioSegmentLoader_.resetLoader = function() {
    resets++;
    realReset.call(this);
  };

  masterPlaylistController.audioSegmentLoader_.resyncLoader = () => resyncs++;
  masterPlaylistController.fastQualityChange_();
  assert.equal(resyncs, 0, 'does not resync the audio segment loader when media same');

  // force different media
  masterPlaylistController.selectPlaylist = () => {
    return masterPlaylistController.master().playlists[1];
  };

  assert.equal(this.requests.length, 1, 'one request');
  masterPlaylistController.fastQualityChange_();
  assert.equal(this.requests.length, 2, 'added a request for new media');
  assert.equal(resyncs, 0, 'does not resync the audio segment loader yet');
  // new media request
  this.standardXHRResponse(this.requests[1]);
  assert.equal(resyncs, 1, 'resyncs the audio segment loader when media changes');
  assert.equal(resets, 0, 'does not reset the audio segment loader when media changes');
});

QUnit.test('audio segment loader is reset on audio track change', function(assert) {
  this.requests.length = 0;
  this.player = createPlayer();
  this.player.src({
    src: 'alternate-audio-multiple-groups.m3u8',
    type: 'application/vnd.apple.mpegurl'
  });

  this.clock.tick(1);

  const masterPlaylistController = this.player.tech_.hls.masterPlaylistController_;

  masterPlaylistController.selectPlaylist = () => {
    return masterPlaylistController.master().playlists[0];
  };

  // master
  this.standardXHRResponse(this.requests.shift());
  // media
  this.standardXHRResponse(this.requests.shift());

  masterPlaylistController.mediaSource.trigger('sourceopen');

  let resyncs = 0;
  let resets = 0;
  let realReset = masterPlaylistController.audioSegmentLoader_.resetLoader;

  masterPlaylistController.audioSegmentLoader_.resetLoader = function() {
    resets++;
    realReset.call(this);
  };
  masterPlaylistController.audioSegmentLoader_.resyncLoader = () => resyncs++;

  assert.equal(this.requests.length, 1, 'one request');
  assert.equal(resyncs, 0, 'does not resync the audio segment loader yet');

  this.player.audioTracks()[1].enabled = true;

  assert.equal(this.requests.length, 2, 'two requests');
  assert.equal(resyncs, 1, 'resyncs the audio segment loader when audio track changes');
  assert.equal(resets, 1, 'resets the audio segment loader when audio track changes');
});

QUnit.test('if buffered, will request second segment byte range', function(assert) {
  this.requests.length = 0;
  this.player.src({
    src: 'manifest/playlist.m3u8',
    type: 'application/vnd.apple.mpegurl'
  });

  this.clock.tick(1);

  this.masterPlaylistController = this.player.tech_.hls.masterPlaylistController_;
  // Make segment metadata noop since most test segments dont have real data
  this.masterPlaylistController.mainSegmentLoader_.addSegmentMetadataCue_ = () => {};

  // mock that the user has played the video before
  this.player.tech_.triggerReady();
  this.clock.tick(1);
  this.player.tech_.trigger('play');
  this.player.tech_.paused_ = false;
  this.player.tech_.played = () => videojs.createTimeRanges([[0, 20]]);

  openMediaSource(this.player, this.clock);
  // playlist
  this.standardXHRResponse(this.requests[0]);

  this.masterPlaylistController.mainSegmentLoader_.sourceUpdater_.buffered = () => {
    return videojs.createTimeRanges([[0, 20]]);
  };
  // 1ms has passed to upload 1kb
  // that gives us a bandwidth of 1024 / 1 * 8 * 1000 = 8192000
  this.clock.tick(1);
  // segment
  this.standardXHRResponse(this.requests[1]);
  this.masterPlaylistController.mainSegmentLoader_.fetchAtBuffer_ = true;
  this.masterPlaylistController.mediaSource.sourceBuffers[0].trigger('updateend');
  this.clock.tick(10 * 1000);
  this.clock.tick(1);
  assert.equal(this.requests[2].headers.Range, 'bytes=522828-1110327');

  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 8192000, 'Live stream');
  assert.equal(this.player.tech_.hls.stats.mediaRequests, 1, '1 segment request');
  assert.equal(this.player.tech_.hls.stats.mediaBytesTransferred,
               1024,
               '1024 bytes downloaded');
});

QUnit.test('re-initializes the combined playlist loader when switching sources',
function(assert) {
  openMediaSource(this.player, this.clock);
  // master
  this.standardXHRResponse(this.requests.shift());
  // playlist
  this.standardXHRResponse(this.requests.shift());
  // segment
  this.standardXHRResponse(this.requests.shift());
  // change the source
  this.player.src({
    src: 'manifest/master.m3u8',
    type: 'application/vnd.apple.mpegurl'
  });

  this.clock.tick(1);

  this.masterPlaylistController = this.player.tech_.hls.masterPlaylistController_;
  // Make segment metadata noop since most test segments dont have real data
  this.masterPlaylistController.mainSegmentLoader_.addSegmentMetadataCue_ = () => {};

  // maybe not needed if https://github.com/videojs/video.js/issues/2326 gets fixed
  this.clock.tick(1);
  assert.ok(!this.masterPlaylistController.masterPlaylistLoader_.media(),
           'no media playlist');
  assert.equal(this.masterPlaylistController.masterPlaylistLoader_.state,
              'HAVE_NOTHING',
              'reset the playlist loader state');
  assert.equal(this.requests.length, 1, 'requested the new src');

  // buffer check
  this.clock.tick(10 * 1000);
  assert.equal(this.requests.length, 1, 'did not request a stale segment');

  // sourceopen
  openMediaSource(this.player, this.clock);

  assert.equal(this.requests.length, 1, 'made one request');
  assert.ok(
    this.requests[0].url.indexOf('master.m3u8') >= 0,
      'requested only the new playlist'
  );
});

QUnit.test('updates the combined segment loader on live playlist refreshes',
function(assert) {
  let updates = [];

  openMediaSource(this.player, this.clock);
  // master
  this.standardXHRResponse(this.requests.shift());
  // media
  this.standardXHRResponse(this.requests.shift());

  this.masterPlaylistController.mainSegmentLoader_.playlist = function(update) {
    updates.push(update);
  };

  this.masterPlaylistController.masterPlaylistLoader_.trigger('loadedplaylist');
  assert.equal(updates.length, 1, 'updated the segment list');
  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
});

QUnit.test(
'fires a progress event after downloading a segment from combined segment loader',
function(assert) {
  let progressCount = 0;

  openMediaSource(this.player, this.clock);

  // master
  this.standardXHRResponse(this.requests.shift());
  // media
  this.standardXHRResponse(this.requests.shift());

  this.player.tech_.on('progress', function() {
    progressCount++;
  });
  // 1ms has passed to upload 1kb
  // that gives us a bandwidth of 1024 / 1 * 8 * 1000 = 8192000
  this.clock.tick(1);
  // segment
  this.standardXHRResponse(this.requests.shift());
  this.masterPlaylistController.mainSegmentLoader_.trigger('progress');
  assert.equal(progressCount, 1, 'fired a progress event');

  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 8192000, 'Live stream');
  assert.equal(this.player.tech_.hls.stats.mediaRequests, 1, '1 segment request');
  assert.equal(this.player.tech_.hls.stats.mediaBytesTransferred,
               1024,
               '1024 bytes downloaded');
});

QUnit.test('updates the active loader when switching from unmuxed to muxed audio group',
function(assert) {
  openMediaSource(this.player, this.clock);
  // master
  this.requests.shift().respond(200, null,
                                manifests.multipleAudioGroupsCombinedMain);
  // media
  this.standardXHRResponse(this.requests.shift());
  // init segment
  this.standardXHRResponse(this.requests.shift());
  // video segment
  this.standardXHRResponse(this.requests.shift());
  // audio media
  this.standardXHRResponse(this.requests.shift());
  // ignore audio segment requests
  this.requests.length = 0;

  let mpc = this.masterPlaylistController;
  let combinedPlaylist = mpc.master().playlists[0];

  assert.ok(mpc.mediaTypes_.AUDIO.activePlaylistLoader,
    'starts with an active playlist loader');

  mpc.masterPlaylistLoader_.media(combinedPlaylist);
  // updated media
  this.requests.shift().respond(200, null,
                                '#EXTM3U\n' +
                                '#EXTINF:5.0\n' +
                                '0.ts\n' +
                                '#EXT-X-ENDLIST\n');

  assert.notOk(mpc.mediaTypes_.AUDIO.activePlaylistLoader,
    'enabled a track in the new audio group');
});

QUnit.test('waits for both main and audio loaders to finish before calling endOfStream',
function(assert) {
  openMediaSource(this.player, this.clock);

  const videoMedia = '#EXTM3U\n' +
                     '#EXT-X-VERSION:3\n' +
                     '#EXT-X-PLAYLIST-TYPE:VOD\n' +
                     '#EXT-X-MEDIA-SEQUENCE:0\n' +
                     '#EXT-X-TARGETDURATION:10\n' +
                     '#EXTINF:10,\n' +
                     'video-0.ts\n' +
                     '#EXT-X-ENDLIST\n';

  const audioMedia = '#EXTM3U\n' +
                     '#EXT-X-VERSION:3\n' +
                     '#EXT-X-PLAYLIST-TYPE:VOD\n' +
                     '#EXT-X-MEDIA-SEQUENCE:0\n' +
                     '#EXT-X-TARGETDURATION:10\n' +
                     '#EXTINF:10,\n' +
                     'audio-0.ts\n' +
                     '#EXT-X-ENDLIST\n';

  let videoEnded = 0;
  let audioEnded = 0;

  const MPC = this.masterPlaylistController;

  MPC.mainSegmentLoader_.on('ended', () => videoEnded++);
  MPC.audioSegmentLoader_.on('ended', () => audioEnded++);

  // master
  this.standardXHRResponse(this.requests.shift(), manifests.demuxed);

  // video media
  this.standardXHRResponse(this.requests.shift(), videoMedia);

  // audio media
  this.standardXHRResponse(this.requests.shift(), audioMedia);

  // video segment
  this.standardXHRResponse(this.requests.shift());

  MPC.mediaSource.sourceBuffers[0].trigger('updateend');

  assert.equal(videoEnded, 1, 'main segment loader triggered endded');
  assert.equal(audioEnded, 0, 'audio segment loader did not trigger ended');
  assert.equal(MPC.mediaSource.readyState, 'open', 'Media Source not yet ended');

  // audio segment
  this.standardXHRResponse(this.requests.shift());

  MPC.mediaSource.sourceBuffers[1].trigger('updateend');

  assert.equal(videoEnded, 1, 'main segment loader did not trigger ended again');
  assert.equal(audioEnded, 1, 'audio segment loader triggered ended');
  assert.equal(MPC.mediaSource.readyState, 'ended', 'Media Source ended');
});

QUnit.test('Segment loaders are unpaused when seeking after player has ended',
function(assert) {
  openMediaSource(this.player, this.clock);

  const videoMedia = '#EXTM3U\n' +
                     '#EXT-X-VERSION:3\n' +
                     '#EXT-X-PLAYLIST-TYPE:VOD\n' +
                     '#EXT-X-MEDIA-SEQUENCE:0\n' +
                     '#EXT-X-TARGETDURATION:10\n' +
                     '#EXTINF:10,\n' +
                     'video-0.ts\n' +
                     '#EXT-X-ENDLIST\n';

  let ended = 0;

  this.masterPlaylistController.mainSegmentLoader_.on('ended', () => ended++);

  this.player.tech_.trigger('play');

  // master
  this.standardXHRResponse(this.requests.shift());

  // media
  this.standardXHRResponse(this.requests.shift(), videoMedia);

  // segment
  this.standardXHRResponse(this.requests.shift());

  assert.notOk(this.masterPlaylistController.mainSegmentLoader_.paused(),
    'segment loader not yet paused');

  this.masterPlaylistController.mediaSource.sourceBuffers[0].trigger('updateend');

  assert.ok(this.masterPlaylistController.mainSegmentLoader_.paused(),
    'segment loader is paused after ending');
  assert.equal(ended, 1, 'segment loader triggered ended event');

  this.player.currentTime(5);

  this.clock.tick(1);

  assert.notOk(this.masterPlaylistController.mainSegmentLoader_.paused(),
    'segment loader unpaused after a seek');
  assert.equal(ended, 1, 'segment loader did not trigger ended event again yet');
});

QUnit.test('detects if the player is stuck at the playlist end', function(assert) {
  let playlistCopy = Hls.Playlist.playlistEnd;

  this.masterPlaylistController.mediaSource.trigger('sourceopen');
  this.standardXHRResponse(this.requests.shift());
  let playlist = this.player.tech_.hls.selectPlaylist();

  // not stuck at playlist end when no seekable, even if empty buffer
  // and positive currentTime
  this.masterPlaylistController.seekable = () => videojs.createTimeRange();
  this.player.tech_.buffered = () => videojs.createTimeRange();
  this.player.tech_.setCurrentTime(170);
  assert.ok(!this.masterPlaylistController.stuckAtPlaylistEnd_(playlist),
            'not stuck at playlist end');

  // not stuck at playlist end when no seekable, even if empty buffer
  // and currentTime 0
  this.player.tech_.setCurrentTime(0);
  assert.ok(!this.masterPlaylistController.stuckAtPlaylistEnd_(playlist),
            'not stuck at playlist end');

  // not stuck at playlist end when no seekable but current time is at
  // the end of the buffered range
  this.player.tech_.buffered = () => videojs.createTimeRange(0, 170);
  assert.ok(!this.masterPlaylistController.stuckAtPlaylistEnd_(playlist),
            'not stuck at playlist end');

  // not stuck at playlist end when currentTime not at seekable end
  // even if the buffer is empty
  this.masterPlaylistController.seekable = () => videojs.createTimeRange(0, 130);
  this.masterPlaylistController.syncController_.getExpiredTime = () => 0;
  this.player.tech_.setCurrentTime(50);
  this.player.tech_.buffered = () => videojs.createTimeRange();
  Hls.Playlist.playlistEnd = () => 130;
  assert.ok(!this.masterPlaylistController.stuckAtPlaylistEnd_(playlist),
            'not stuck at playlist end');

  // not stuck at playlist end when buffer reached the absolute end of the playlist
  // and current time is in the buffered range
  this.player.tech_.setCurrentTime(159);
  this.player.tech_.buffered = () => videojs.createTimeRange(0, 160);
  Hls.Playlist.playlistEnd = () => 160;
  assert.ok(!this.masterPlaylistController.stuckAtPlaylistEnd_(playlist),
            'not stuck at playlist end');

  // stuck at playlist end when there is no buffer and playhead
  // reached absolute end of playlist
  this.player.tech_.setCurrentTime(160);
  assert.ok(this.masterPlaylistController.stuckAtPlaylistEnd_(playlist),
            'stuck at playlist end');

  // stuck at playlist end when current time reached the buffer end
  // and buffer has reached absolute end of playlist
  this.masterPlaylistController.seekable = () => videojs.createTimeRange(90, 130);
  this.player.tech_.buffered = () => videojs.createTimeRange(0, 170);
  this.player.tech_.setCurrentTime(170);
  Hls.Playlist.playlistEnd = () => 170;
  assert.ok(this.masterPlaylistController.stuckAtPlaylistEnd_(playlist),
            'stuck at playlist end');

  Hls.Playlist.playlistEnd = playlistCopy;
});

QUnit.test('blacklists switching from video+audio playlists to audio only',
function(assert) {
  let audioPlaylist;

  openMediaSource(this.player, this.clock);

  this.player.tech_.hls.bandwidth = 1e10;

  // master
  this.requests.shift().respond(200, null,
                                '#EXTM3U\n' +
                                '#EXT-X-STREAM-INF:BANDWIDTH=1,CODECS="mp4a.40.2"\n' +
                                'media.m3u8\n' +
                                '#EXT-X-STREAM-INF:BANDWIDTH=10,RESOLUTION=1x1\n' +
                                'media1.m3u8\n');
  // media1
  this.standardXHRResponse(this.requests.shift());

  assert.equal(this.masterPlaylistController.masterPlaylistLoader_.media(),
              this.masterPlaylistController.masterPlaylistLoader_.master.playlists[1],
              'selected video+audio');
  audioPlaylist = this.masterPlaylistController.masterPlaylistLoader_.master.playlists[0];
  assert.equal(audioPlaylist.excludeUntil, Infinity, 'excluded incompatible playlist');

  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 1e10, 'bandwidth we set above');
});

QUnit.test('blacklists switching from audio-only playlists to video+audio',
function(assert) {
  let videoAudioPlaylist;

  openMediaSource(this.player, this.clock);

  this.player.tech_.hls.bandwidth = 1;
  // master
  this.requests.shift().respond(200, null,
                                '#EXTM3U\n' +
                                '#EXT-X-STREAM-INF:BANDWIDTH=1,CODECS="mp4a.40.2"\n' +
                                'media.m3u8\n' +
                                '#EXT-X-STREAM-INF:BANDWIDTH=10,RESOLUTION=1x1\n' +
                                'media1.m3u8\n');

  // media1
  this.standardXHRResponse(this.requests.shift());
  assert.equal(this.masterPlaylistController.masterPlaylistLoader_.media(),
              this.masterPlaylistController.masterPlaylistLoader_.master.playlists[0],
              'selected audio only');
  videoAudioPlaylist =
    this.masterPlaylistController.masterPlaylistLoader_.master.playlists[1];
  assert.equal(videoAudioPlaylist.excludeUntil,
              Infinity,
              'excluded incompatible playlist');

  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 1, 'bandwidth we set above');
});

QUnit.test('blacklists switching from video-only playlists to video+audio',
function(assert) {
  let videoAudioPlaylist;

  openMediaSource(this.player, this.clock);

  this.player.tech_.hls.bandwidth = 1;
  // master
  this.requests.shift()
    .respond(200, null,
             '#EXTM3U\n' +
             '#EXT-X-STREAM-INF:BANDWIDTH=1,CODECS="avc1.4d400d"\n' +
             'media.m3u8\n' +
             '#EXT-X-STREAM-INF:BANDWIDTH=10,CODECS="avc1.4d400d,mp4a.40.2"\n' +
             'media1.m3u8\n');

  // media
  this.standardXHRResponse(this.requests.shift());
  assert.equal(this.masterPlaylistController.masterPlaylistLoader_.media(),
              this.masterPlaylistController.masterPlaylistLoader_.master.playlists[0],
              'selected video only');
  videoAudioPlaylist =
    this.masterPlaylistController.masterPlaylistLoader_.master.playlists[1];
  assert.equal(videoAudioPlaylist.excludeUntil,
              Infinity,
              'excluded incompatible playlist');

  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 1, 'bandwidth we set above');
});

QUnit.test('blacklists switching between playlists with incompatible audio codecs',
function(assert) {
  let alternatePlaylist;

  openMediaSource(this.player, this.clock);

  this.player.tech_.hls.bandwidth = 1;
  // master
  this.requests.shift()
    .respond(200, null,
             '#EXTM3U\n' +
             '#EXT-X-STREAM-INF:BANDWIDTH=1,CODECS="avc1.4d400d,mp4a.40.5"\n' +
             'media.m3u8\n' +
             '#EXT-X-STREAM-INF:BANDWIDTH=10,CODECS="avc1.4d400d,mp4a.40.2"\n' +
             'media1.m3u8\n');

  // media
  this.standardXHRResponse(this.requests.shift());
  assert.equal(this.masterPlaylistController.masterPlaylistLoader_.media(),
              this.masterPlaylistController.masterPlaylistLoader_.master.playlists[0],
              'selected HE-AAC stream');
  alternatePlaylist =
    this.masterPlaylistController.masterPlaylistLoader_.master.playlists[1];
  assert.equal(alternatePlaylist.excludeUntil,
               undefined,
               'not excluded incompatible playlist');
  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 1, 'bandwidth we set above');
});

QUnit.test('updates the combined segment loader on media changes', function(assert) {
  let updates = [];

  this.masterPlaylistController.mediaSource.trigger('sourceopen');

  this.masterPlaylistController.mainSegmentLoader_.bandwidth = 1;

  // master
  this.standardXHRResponse(this.requests.shift());
  // media
  this.standardXHRResponse(this.requests.shift());

  this.masterPlaylistController.mainSegmentLoader_.playlist = function(update) {
    updates.push(update);
  };
  // 1ms has passed to upload 1kb
  // that gives us a bandwidth of 1024 / 1 * 8 * 1000 = 8192000
  this.clock.tick(1);

  this.masterPlaylistController.mainSegmentLoader_.mediaIndex = 0;
  // downloading the new segment will update bandwidth and cause a
  // playlist change
  // segment 0
  this.standardXHRResponse(this.requests.shift());
  // update the buffer to reflect the appended segment, and have enough buffer to
  // change playlist
  this.masterPlaylistController.tech_.buffered = () => {
    return videojs.createTimeRanges([[0, 30]]);
  };
  this.masterPlaylistController.mediaSource.sourceBuffers[0].trigger('updateend');
  // media
  this.standardXHRResponse(this.requests.shift());
  assert.ok(updates.length > 0, 'updated the segment list');

  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 8192000, 'Live stream');
  assert.equal(this.player.tech_.hls.stats.mediaRequests, 1, '1 segment request');
  assert.equal(this.player.tech_.hls.stats.mediaBytesTransferred,
               1024,
               '1024 bytes downloaded');
});

QUnit.test('selects a playlist after main/combined segment downloads', function(assert) {
  let calls = 0;

  this.masterPlaylistController.selectPlaylist = () => {
    calls++;
    return this.masterPlaylistController.masterPlaylistLoader_.master.playlists[0];
  };
  this.masterPlaylistController.mediaSource.trigger('sourceopen');

  // master
  this.standardXHRResponse(this.requests.shift());
  // media
  this.standardXHRResponse(this.requests.shift());

  // "downloaded" a segment
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.strictEqual(calls, 2, 'selects after the initial segment');

  // and another
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.strictEqual(calls, 3, 'selects after additional segments');
  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
});

QUnit.test('re-triggers bandwidthupdate events on the tech', function(assert) {
  this.masterPlaylistController.mediaSource.trigger('sourceopen');
  // master
  this.standardXHRResponse(this.requests.shift());
  // media
  this.standardXHRResponse(this.requests.shift());

  let bandwidthupdateEvents = 0;

  this.player.tech_.on('bandwidthupdate', () => bandwidthupdateEvents++);

  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');

  assert.equal(bandwidthupdateEvents, 1, 'triggered bandwidthupdate');

  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');

  assert.equal(bandwidthupdateEvents, 2, 'triggered bandwidthupdate');
});

QUnit.test('switches to lower renditions immediately, higher dependent on buffer',
function(assert) {
  this.masterPlaylistController.mediaSource.trigger('sourceopen');
  // master
  this.standardXHRResponse(this.requests.shift());
  // media
  this.standardXHRResponse(this.requests.shift());

  let buffered = [];
  let currentPlaylistBandwidth = 0;
  let nextPlaylistBandwidth = 0;
  let mediaChanges = [];
  let currentTime = 0;
  let endList = true;
  let duration = 100;

  this.masterPlaylistController.tech_.currentTime = () => currentTime;
  this.masterPlaylistController.tech_.buffered = () => videojs.createTimeRanges(buffered);
  this.masterPlaylistController.duration = () => duration;
  this.masterPlaylistController.selectPlaylist = () => {
    return {
      attributes: {
        BANDWIDTH: nextPlaylistBandwidth
      },
      endList
    };
  };
  this.masterPlaylistController.masterPlaylistLoader_.media = (media) => {
    if (!media) {
      return {
        attributes: {
          BANDWIDTH: currentPlaylistBandwidth
        },
        endList
      };
    }
    mediaChanges.push(media);
  };

  currentTime = 0;
  currentPlaylistBandwidth = 1000;
  nextPlaylistBandwidth = 1000;
  buffered = [];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               1,
               'changes media when no buffer and equal bandwidth playlist');
  buffered = [[0, 9]];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               2,
               'changes media when sufficient forward buffer and equal ' +
               'bandwidth playlist');
  buffered = [[0, 30]];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               3,
               'changes media when sufficient forward buffer and equal ' +
               'bandwidth playlist');

  mediaChanges.length = 0;

  currentTime = 10;
  currentPlaylistBandwidth = 1000;
  nextPlaylistBandwidth = 1001;
  buffered = [];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               0,
               'did not change media when no buffer and and higher bandwidth playlist');
  buffered = [[0, 19]];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               0,
               'did not change media when insufficient forward buffer and higher ' +
               'bandwidth playlist');
  buffered = [[0, 20]];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               1,
               'changes media when sufficient forward buffer and higher ' +
               'bandwidth playlist');
  buffered = [[0, 21]];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               2,
               'changes media when sufficient forward buffer and higher ' +
               'bandwidth playlist');

  mediaChanges.length = 0;

  currentTime = 100;
  currentPlaylistBandwidth = 1000;
  nextPlaylistBandwidth = 1001;
  buffered = [];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               0,
               'did not change media when no buffer and higher bandwidth playlist');
  buffered = [[0, 100], [100, 109]];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               0,
               'did not change media when insufficient forward buffer and higher ' +
               'bandwidth playlist');
  buffered = [[0, 100], [100, 130]];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               1,
               'changes media when sufficient forward buffer and higher ' +
               'bandwidth playlist');

  mediaChanges.length = 0;

  buffered = [];
  currentPlaylistBandwidth = 1000;
  nextPlaylistBandwidth = 999;
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               1,
               'changes media when no buffer but lower bandwidth playlist');
  buffered = [[100, 109]];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               2,
               'changes media when insufficient forward buffer but lower ' +
               'bandwidth playlist');
  buffered = [[100, 110]];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               3,
               'changes media when sufficient forward buffer and lower ' +
               'bandwidth playlist');

  mediaChanges.length = 0;

  endList = false;
  currentTime = 100;
  currentPlaylistBandwidth = 1000;
  nextPlaylistBandwidth = 1001;
  buffered = [];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               1,
               'changes live media when no buffer and higher bandwidth playlist');
  buffered = [[0, 100], [100, 109]];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               2,
               'changes live media when insufficient forward buffer and higher ' +
               'bandwidth playlist');
  buffered = [[0, 100], [100, 130]];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               3,
               'changes live media when sufficient forward buffer and higher ' +
               'bandwidth playlist');

  mediaChanges.length = 0;

  endList = true;
  currentTime = 9;
  duration = 18;
  buffered = [];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               1,
               'changes media when no buffer and duration less than low water line');
  buffered = [[0, 10]];
  this.masterPlaylistController.mainSegmentLoader_.trigger('bandwidthupdate');
  assert.equal(mediaChanges.length,
               2,
               'changes media when insufficient forward buffer and duration ' +
               'less than low water line');
});

QUnit.test('blacklists playlist on earlyabort', function(assert) {
  this.masterPlaylistController.mediaSource.trigger('sourceopen');
  // master
  this.standardXHRResponse(this.requests.shift());
  // media
  this.standardXHRResponse(this.requests.shift());

  let mediaChanges = [];
  const playlistLoader = this.masterPlaylistController.masterPlaylistLoader_;
  const currentMedia = playlistLoader.media();
  const origMedia = playlistLoader.media.bind(playlistLoader);
  const origWarn = videojs.log.warn;
  let warnings = [];

  this.masterPlaylistController.masterPlaylistLoader_.media = (media) => {
    if (media) {
      mediaChanges.push(media);
    }
    return origMedia(media);
  };

  videojs.log.warn = (text) => warnings.push(text);

  assert.notOk(currentMedia.excludeUntil > 0, 'playlist not blacklisted');
  assert.equal(mediaChanges.length, 0, 'no media change');

  this.masterPlaylistController.mainSegmentLoader_.trigger('earlyabort');

  assert.ok(currentMedia.excludeUntil > 0, 'playlist blacklisted');
  assert.equal(mediaChanges.length, 1, 'one media change');
  assert.equal(warnings.length, 1, 'one warning logged');
  assert.equal(warnings[0],
               'Problem encountered with the current HLS playlist. ' +
                 'Aborted early because there isn\'t enough bandwidth to complete the ' +
                 'request without rebuffering. Switching to another playlist.',
               'warning message is correct');

  videojs.log.warn = origWarn;
});

QUnit.test('does not get stuck in a loop due to inconsistent network/caching',
function(assert) {
  /*
   * This test is a long one, but it is meant to follow a true path to a possible loop.
   * The reason for the loop is due to inconsistent network bandwidth, often caused or
   * amplified by caching at the browser or edge server level.
   * The steps are as follows:
   *
   * 1) Request segment 0 from low bandwidth playlist
   * 2) Request segment 1 from low bandwidth playlist
   * 3) Switch up due to good bandwidth (2 segments are required before upswitching)
   * 4) Request segment 0 from high bandwidth playlist
   * 5) Abort request early due to low bandwidth
   * 6) Request segment 0 from low bandwidth playlist
   * 7) Request segment 1 from low bandwidth playlist
   * 8) Request segment 2 from low bandwidth playlist, despite enough bandwidth to
   *    upswitch. This part is the key, as the behavior we want to avoid is an upswitch
   *    back to the high bandwidth playlist (thus starting a potentially infinite loop).
   */

  const mediaContents =
    '#EXTM3U\n' +
    '#EXTINF:10\n' +
    '0.ts\n' +
    '#EXTINF:10\n' +
    '1.ts\n' +
    '#EXTINF:10\n' +
    '2.ts\n' +
    '#EXTINF:10\n' +
    '3.ts\n' +
    '#EXT-X-ENDLIST\n';

  const segmentLoader = this.masterPlaylistController.mainSegmentLoader_;

  // start on lowest bandwidth rendition (will be media.m3u8)
  segmentLoader.bandwidth = 0;

  this.player.tech_.paused = () => false;
  this.masterPlaylistController.mediaSource.trigger('sourceopen');
  // master
  this.requests.shift().respond(200, null,
                                '#EXTM3U\n' +
                                '#EXT-X-STREAM-INF:BANDWIDTH=10\n' +
                                'media.m3u8\n' +
                                '#EXT-X-STREAM-INF:BANDWIDTH=100\n' +
                                'media1.m3u8\n');
  // media.m3u8
  this.requests.shift().respond(200, null, mediaContents);

  let playlistLoader = this.masterPlaylistController.masterPlaylistLoader_;
  let origMedia = playlistLoader.media.bind(playlistLoader);
  let mediaChanges = [];

  this.masterPlaylistController.masterPlaylistLoader_.media = (media) => {
    if (media) {
      mediaChanges.push(media);
    }
    return origMedia(media);
  };

  this.clock.tick(1);

  let segmentRequest = this.requests[0];

  assert.equal(segmentRequest.uri.substring(segmentRequest.uri.length - 4),
               '0.ts',
               'requested first segment');

  // 100ms for the segment response
  this.clock.tick(100);
  // 10 bytes in 100ms = 800 bits/s
  this.requests[0].response = new Uint8Array(10).buffer;
  this.requests.shift().respond(200, null, '');
  segmentLoader.mediaSource_.sourceBuffers[0].trigger('updateend');
  this.clock.tick(1);
  segmentRequest = this.requests[0];

  // should be walking forwards (need two segments before we can switch)
  assert.equal(segmentLoader.bandwidth, 800, 'bandwidth is correct');
  assert.equal(segmentRequest.uri.substring(segmentRequest.uri.length - 4),
               '1.ts',
               'requested second segment');
  assert.equal(mediaChanges.length, 0, 'no media changes');

  // 100ms for the segment response
  this.clock.tick(100);
  // 11 bytes in 100ms = 880 bits/s
  this.requests[0].response = new Uint8Array(11).buffer;
  this.requests.shift().respond(200, null, '');
  segmentLoader.mediaSource_.sourceBuffers[0].trigger('updateend');
  this.clock.tick(1);

  let mediaRequest = this.requests[0];

  // after two segments, bandwidth is high enough to switch up to media1.m3u8
  assert.equal(segmentLoader.bandwidth, 880, 'bandwidth is correct');
  assert.equal(mediaChanges.length, 1, 'changed media');
  assert.equal(mediaChanges[0].uri, 'media1.m3u8', 'changed to media1');
  assert.equal(mediaRequest.uri.substring(mediaRequest.uri.length - 'media1.m3u8'.length),
               'media1.m3u8',
               'requested media1');

  // media1.m3u8
  this.requests.shift().respond(200, null, mediaContents);
  this.clock.tick(1);
  segmentRequest = this.requests[0];

  assert.equal(segmentLoader.playlist_.uri,
               'media1.m3u8',
               'segment loader playlist is media1');

  const media1ResolvedPlaylist = segmentLoader.playlist_;

  assert.notOk(media1ResolvedPlaylist.excludeUntil, 'media1 not blacklisted');
  assert.equal(segmentRequest.uri.substring(segmentRequest.uri.length - 4),
               '0.ts',
               'requested first segment');

  // needs a timeout for early abort to occur (we skip the function otherwise, since no
  // timeout means we are on the last rendition)
  segmentLoader.xhrOptions_.timeout = 60000;
  // we need to wait 1 second from first byte receieved in order to consider aborting
  this.requests[0].downloadProgress({
    target: this.requests[0],
    total: 100,
    loaded: 1
  });
  this.clock.tick(1000);
  // should abort request early because we don't have enough bandwidth
  this.requests[0].downloadProgress({
    target: this.requests[0],
    total: 100,
    // 1 bit per second
    loaded: 2
  });
  this.clock.tick(1);

  // aborted request, so switched back to lowest rendition
  assert.equal(segmentLoader.bandwidth,
               10 * Config.BANDWIDTH_VARIANCE + 1,
               'bandwidth is correct for abort');
  assert.equal(mediaChanges.length, 2, 'changed media');
  assert.equal(mediaChanges[1].uri, 'media.m3u8', 'changed to media');
  assert.ok(media1ResolvedPlaylist.excludeUntil, 'blacklisted media1');
  assert.equal(segmentRequest.uri.substring(segmentRequest.uri.length - 4),
               '0.ts',
               'requested first segment');

  // remove aborted request
  this.requests.shift();
  // 1ms for the cached segment response
  this.clock.tick(1);
  // 10 bytes in 1ms = 80 kbps
  this.requests[0].response = new Uint8Array(10).buffer;
  this.requests.shift().respond(200, null, '');
  segmentLoader.mediaSource_.sourceBuffers[0].trigger('updateend');
  this.clock.tick(1);
  segmentRequest = this.requests[0];

  // walking forwards, still need two segments before trying to change rendition
  assert.equal(segmentLoader.bandwidth, 80000, 'bandwidth is correct');
  assert.equal(mediaChanges.length, 2, 'did not change media');
  assert.equal(segmentRequest.uri.substring(segmentRequest.uri.length - 4),
               '1.ts',
               'requested second segment');

  // 1ms for the cached segment response
  this.clock.tick(1);
  // 11 bytes in 1ms = 88 kbps
  this.requests[0].response = new Uint8Array(11).buffer;
  this.requests.shift().respond(200, null, '');
  segmentLoader.mediaSource_.sourceBuffers[0].trigger('updateend');
  this.clock.tick(1);

  // Media may be changed, but it should be changed to the same media. In the future, this
  // can safely not be changed.
  assert.equal(segmentLoader.bandwidth, 88000, 'bandwidth is correct');
  assert.equal(mediaChanges.length, 3, 'changed media');
  assert.equal(mediaChanges[2].uri, 'media.m3u8', 'media remains unchanged');

  segmentRequest = this.requests[0];
  assert.equal(segmentRequest.uri.substring(segmentRequest.uri.length - 4),
               '2.ts',
               'requested third segment');

  assert.equal(this.env.log.warn.callCount, 1, 'logged a warning');
  this.env.log.warn.callCount = 0;
});

QUnit.test('updates the duration after switching playlists', function(assert) {
  let selectedPlaylist = false;

  this.masterPlaylistController.mediaSource.trigger('sourceopen');

  this.masterPlaylistController.bandwidth = 1e20;

  // master
  this.standardXHRResponse(this.requests[0]);
  // media
  this.standardXHRResponse(this.requests[1]);

  this.masterPlaylistController.selectPlaylist = () => {
    selectedPlaylist = true;

    // this duration should be overwritten by the playlist change
    this.masterPlaylistController.mediaSource.duration = 0;
    this.masterPlaylistController.mediaSource.readyState = 'open';

    return this.masterPlaylistController.masterPlaylistLoader_.master.playlists[1];
  };
  // 1ms has passed to upload 1kb
  // that gives us a bandwidth of 1024 / 1 * 8 * 1000 = 8192000
  this.clock.tick(1);
  this.masterPlaylistController.mainSegmentLoader_.mediaIndex = 0;
  // segment 0
  this.standardXHRResponse(this.requests[2]);
  this.masterPlaylistController.mediaSource.sourceBuffers[0].trigger('updateend');
  // media1
  this.standardXHRResponse(this.requests[3]);
  assert.ok(selectedPlaylist, 'selected playlist');
  assert.ok(this.masterPlaylistController.mediaSource.duration !== 0,
           'updates the duration');

  // verify stats
  assert.equal(this.player.tech_.hls.stats.bandwidth, 819