Added bandwidth stats to HLS (#685)

* Added bandwidth stats to HLS
* moved bandwidth stats to reside on segment loaders
* added accessors for stats on master playlist controller
* added getters for stats using master playlist controller on hls
* updated tests to check for stats

@@ -170,6 +170,40 @@ export default class MasterPlaylistController extends videojs.EventTarget {
   }
   }
 
 
   /**
   /**
+   * get the total number of media requests from the `audiosegmentloader_`
+   * and the `mainSegmentLoader_`
+   *
+   * @private
+   */
+  mediaRequests_() {
+    return this.audioSegmentLoader_.mediaRequests +
+           this.mainSegmentLoader_.mediaRequests;
+  }
+
+  /**
+   * get the total time that media requests have spent trnasfering
+   * from the `audiosegmentloader_` and the `mainSegmentLoader_`
+   *
+   * @private
+   */
+  mediaTransferDuration_() {
+    return this.audioSegmentLoader_.mediaTransferDuration +
+           this.mainSegmentLoader_.mediaTransferDuration;
+
+  }
+
+  /**
+   * get the total number of bytes transfered during media requests
+   * from the `audiosegmentloader_` and the `mainSegmentLoader_`
+   *
+   * @private
+   */
+  mediaBytesTransferred_() {
+    return this.audioSegmentLoader_.mediaBytesTransferred +
+           this.mainSegmentLoader_.mediaBytesTransferred;
+  }
+
+  /**
    * fill our internal list of HlsAudioTracks with data from
    * fill our internal list of HlsAudioTracks with data from
    * the master playlist or use a default
    * the master playlist or use a default
    *
    *
@@ -350,7 +384,8 @@ export default class MasterPlaylistController extends videojs.EventTarget {
 
 
     if (media !== this.masterPlaylistLoader_.media()) {
     if (media !== this.masterPlaylistLoader_.media()) {
       this.masterPlaylistLoader_.media(media);
       this.masterPlaylistLoader_.media(media);
-      this.mainSegmentLoader_.sourceUpdater_.remove(this.tech_.currentTime() + 5, Infinity);
+      this.mainSegmentLoader_.sourceUpdater_.remove(this.tech_.currentTime() + 5,
+                                                    Infinity);
     }
     }
   }
   }
 
 

@@ -131,7 +131,7 @@ export default class SegmentLoader extends videojs.EventTarget {
     this.state = 'INIT';
     this.state = 'INIT';
     this.bandwidth = settings.bandwidth;
     this.bandwidth = settings.bandwidth;
     this.roundTrip = NaN;
     this.roundTrip = NaN;
-    this.bytesReceived = 0;
+    this.resetStats_();
 
 
     // private properties
     // private properties
     this.hasPlayed_ = settings.hasPlayed;
     this.hasPlayed_ = settings.hasPlayed;
@@ -153,6 +153,17 @@ export default class SegmentLoader extends videojs.EventTarget {
   }
   }
 
 
   /**
   /**
+   * reset all of our media stats
+   *
+   * @private
+   */
+  resetStats_() {
+    this.mediaBytesTransferred = 0;
+    this.mediaRequests = 0;
+    this.mediaTransferDuration = 0;
+  }
+
+  /**
    * dispose of the SegmentLoader and reset to the default state
    * dispose of the SegmentLoader and reset to the default state
    */
    */
   dispose() {
   dispose() {
@@ -161,6 +172,7 @@ export default class SegmentLoader extends videojs.EventTarget {
     if (this.sourceUpdater_) {
     if (this.sourceUpdater_) {
       this.sourceUpdater_.dispose();
       this.sourceUpdater_.dispose();
     }
     }
+    this.resetStats_();
   }
   }
 
 
   /**
   /**
@@ -625,7 +637,9 @@ export default class SegmentLoader extends videojs.EventTarget {
       // calculate the download bandwidth based on segment request
       // calculate the download bandwidth based on segment request
       this.roundTrip = request.roundTripTime;
       this.roundTrip = request.roundTripTime;
       this.bandwidth = request.bandwidth;
       this.bandwidth = request.bandwidth;
-      this.bytesReceived += request.bytesReceived || 0;
+      this.mediaBytesTransferred += request.bytesReceived || 0;
+      this.mediaRequests += 1;
+      this.mediaTransferDuration += request.roundTripTime || 0;
 
 
       if (segment.key) {
       if (segment.key) {
         segmentInfo.encryptedBytes = new Uint8Array(request.response);
         segmentInfo.encryptedBytes = new Uint8Array(request.response);

@@ -301,12 +301,16 @@ class HlsHandler extends Component {
 
 
     this.tech_ = tech;
     this.tech_ = tech;
     this.source_ = source;
     this.source_ = source;
+    this.stats = {};
 
 
     // handle global & Source Handler level options
     // handle global & Source Handler level options
     this.options_ = videojs.mergeOptions(videojs.options.hls || {}, options.hls);
     this.options_ = videojs.mergeOptions(videojs.options.hls || {}, options.hls);
     this.setOptions_();
     this.setOptions_();
 
 
-    this.bytesReceived = 0;
+    // start playlist selection at a reasonable bandwidth for
+    // broadband internet
+    // 0.5 Mbps
+    this.bandwidth = this.options_.bandwidth || 4194304;
 
 
     // listen for fullscreenchange events for this player so that we
     // listen for fullscreenchange events for this player so that we
     // can adjust our quality selection quickly
     // can adjust our quality selection quickly
@@ -406,6 +410,19 @@ class HlsHandler extends Component {
       }
       }
     });
     });
 
 
+    Object.defineProperty(this.stats, 'bandwidth', {
+      get: () => this.bandwidth || 0
+    });
+    Object.defineProperty(this.stats, 'mediaRequests', {
+      get: () => this.masterPlaylistController_.mediaRequests_() || 0
+    });
+    Object.defineProperty(this.stats, 'mediaTransferDuration', {
+      get: () => this.masterPlaylistController_.mediaTransferDuration_() || 0
+    });
+    Object.defineProperty(this.stats, 'mediaBytesTransferred', {
+      get: () => this.masterPlaylistController_.mediaBytesTransferred_() || 0
+    });
+
     this.tech_.one('canplay',
     this.tech_.one('canplay',
       this.masterPlaylistController_.setupFirstPlay.bind(this.masterPlaylistController_));
       this.masterPlaylistController_.setupFirstPlay.bind(this.masterPlaylistController_));
 
 
@@ -527,7 +544,6 @@ class HlsHandler extends Component {
       this.masterPlaylistController_.dispose();
       this.masterPlaylistController_.dispose();
     }
     }
     this.tech_.audioTracks().removeEventListener('change', this.audioTrackChange_);
     this.tech_.audioTracks().removeEventListener('change', this.audioTrackChange_);
-
     super.dispose();
     super.dispose();
   }
   }
 }
 }

@@ -64,6 +64,9 @@ QUnit.test('obeys none preload option', function() {
   openMediaSource(this.player, this.clock);
   openMediaSource(this.player, this.clock);
 
 
   QUnit.equal(this.requests.length, 0, 'no segment requests');
   QUnit.equal(this.requests.length, 0, 'no segment requests');
+
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
 });
 });
 
 
 QUnit.test('obeys auto preload option', function() {
 QUnit.test('obeys auto preload option', function() {
@@ -76,6 +79,9 @@ QUnit.test('obeys auto preload option', function() {
   openMediaSource(this.player, this.clock);
   openMediaSource(this.player, this.clock);
 
 
   QUnit.equal(this.requests.length, 1, '1 segment request');
   QUnit.equal(this.requests.length, 1, '1 segment request');
+
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
 });
 });
 
 
 QUnit.test('obeys metadata preload option', function() {
 QUnit.test('obeys metadata preload option', function() {
@@ -88,6 +94,9 @@ QUnit.test('obeys metadata preload option', function() {
   openMediaSource(this.player, this.clock);
   openMediaSource(this.player, this.clock);
 
 
   QUnit.equal(this.requests.length, 1, '1 segment request');
   QUnit.equal(this.requests.length, 1, '1 segment request');
+
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
 });
 });
 
 
 QUnit.test('clears some of the buffer for a fast quality change', function() {
 QUnit.test('clears some of the buffer for a fast quality change', function() {
@@ -114,6 +123,9 @@ QUnit.test('clears some of the buffer for a fast quality change', function() {
   QUnit.equal(removes.length, 1, 'removed buffered content');
   QUnit.equal(removes.length, 1, 'removed buffered content');
   QUnit.equal(removes[0].start, 7 + 5, 'removed from a bit after current time');
   QUnit.equal(removes[0].start, 7 + 5, 'removed from a bit after current time');
   QUnit.equal(removes[0].end, Infinity, 'removed to the end');
   QUnit.equal(removes[0].end, Infinity, 'removed to the end');
+
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
 });
 });
 
 
 QUnit.test('does not clear the buffer when no fast quality change occurs', function() {
 QUnit.test('does not clear the buffer when no fast quality change occurs', function() {
@@ -134,6 +146,8 @@ QUnit.test('does not clear the buffer when no fast quality change occurs', funct
   this.masterPlaylistController.fastQualityChange_();
   this.masterPlaylistController.fastQualityChange_();
 
 
   QUnit.equal(removes.length, 0, 'did not remove content');
   QUnit.equal(removes.length, 0, 'did not remove content');
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
 });
 });
 
 
 QUnit.test('if buffered, will request second segment byte range', function() {
 QUnit.test('if buffered, will request second segment byte range', function() {
@@ -163,6 +177,13 @@ QUnit.test('if buffered, will request second segment byte range', function() {
   this.masterPlaylistController.mediaSource.sourceBuffers[0].trigger('updateend');
   this.masterPlaylistController.mediaSource.sourceBuffers[0].trigger('updateend');
   this.clock.tick(10 * 1000);
   this.clock.tick(10 * 1000);
   QUnit.equal(this.requests[2].headers.Range, 'bytes=1823412-2299991');
   QUnit.equal(this.requests[2].headers.Range, 'bytes=1823412-2299991');
+
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, Infinity, 'Live stream');
+  QUnit.equal(this.player.tech_.hls.stats.mediaRequests, 1, '1 segment request');
+  QUnit.equal(this.player.tech_.hls.stats.mediaBytesTransferred,
+              16,
+              '16 bytes downloaded');
 });
 });
 
 
 QUnit.test('re-initializes the combined playlist loader when switching sources',
 QUnit.test('re-initializes the combined playlist loader when switching sources',
@@ -218,6 +239,8 @@ QUnit.test('updates the combined segment loader on live playlist refreshes', fun
 
 
   this.masterPlaylistController.masterPlaylistLoader_.trigger('loadedplaylist');
   this.masterPlaylistController.masterPlaylistLoader_.trigger('loadedplaylist');
   QUnit.equal(updates.length, 1, 'updated the segment list');
   QUnit.equal(updates.length, 1, 'updated the segment list');
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
 });
 });
 
 
 QUnit.test(
 QUnit.test(
@@ -240,6 +263,13 @@ function() {
   standardXHRResponse(this.requests.shift());
   standardXHRResponse(this.requests.shift());
   this.masterPlaylistController.mainSegmentLoader_.trigger('progress');
   this.masterPlaylistController.mainSegmentLoader_.trigger('progress');
   QUnit.equal(progressCount, 1, 'fired a progress event');
   QUnit.equal(progressCount, 1, 'fired a progress event');
+
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, Infinity, 'Live stream');
+  QUnit.equal(this.player.tech_.hls.stats.mediaRequests, 1, '1 segment request');
+  QUnit.equal(this.player.tech_.hls.stats.mediaBytesTransferred,
+              16,
+              '16 bytes downloaded');
 });
 });
 
 
 QUnit.test('blacklists switching from video+audio playlists to audio only', function() {
 QUnit.test('blacklists switching from video+audio playlists to audio only', function() {
@@ -264,6 +294,9 @@ QUnit.test('blacklists switching from video+audio playlists to audio only', func
               'selected video+audio');
               'selected video+audio');
   audioPlaylist = this.masterPlaylistController.masterPlaylistLoader_.master.playlists[0];
   audioPlaylist = this.masterPlaylistController.masterPlaylistLoader_.master.playlists[0];
   QUnit.equal(audioPlaylist.excludeUntil, Infinity, 'excluded incompatible playlist');
   QUnit.equal(audioPlaylist.excludeUntil, Infinity, 'excluded incompatible playlist');
+
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, 1e10, 'bandwidth we set above');
 });
 });
 
 
 QUnit.test('blacklists switching from audio-only playlists to video+audio', function() {
 QUnit.test('blacklists switching from audio-only playlists to video+audio', function() {
@@ -290,6 +323,9 @@ QUnit.test('blacklists switching from audio-only playlists to video+audio', func
   QUnit.equal(videoAudioPlaylist.excludeUntil,
   QUnit.equal(videoAudioPlaylist.excludeUntil,
               Infinity,
               Infinity,
               'excluded incompatible playlist');
               'excluded incompatible playlist');
+
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, 1, 'bandwidth we set above');
 });
 });
 
 
 QUnit.test('blacklists switching from video-only playlists to video+audio', function() {
 QUnit.test('blacklists switching from video-only playlists to video+audio', function() {
@@ -317,6 +353,9 @@ QUnit.test('blacklists switching from video-only playlists to video+audio', func
   QUnit.equal(videoAudioPlaylist.excludeUntil,
   QUnit.equal(videoAudioPlaylist.excludeUntil,
               Infinity,
               Infinity,
               'excluded incompatible playlist');
               'excluded incompatible playlist');
+
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, 1, 'bandwidth we set above');
 });
 });
 
 
 QUnit.test('blacklists switching between playlists with incompatible audio codecs',
 QUnit.test('blacklists switching between playlists with incompatible audio codecs',
@@ -343,6 +382,8 @@ function() {
   alternatePlaylist =
   alternatePlaylist =
     this.masterPlaylistController.masterPlaylistLoader_.master.playlists[1];
     this.masterPlaylistController.masterPlaylistLoader_.master.playlists[1];
   QUnit.equal(alternatePlaylist.excludeUntil, Infinity, 'excluded incompatible playlist');
   QUnit.equal(alternatePlaylist.excludeUntil, Infinity, 'excluded incompatible playlist');
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, 1, 'bandwidth we set above');
 });
 });
 
 
 QUnit.test('updates the combined segment loader on media changes', function() {
 QUnit.test('updates the combined segment loader on media changes', function() {
@@ -369,6 +410,14 @@ QUnit.test('updates the combined segment loader on media changes', function() {
   // media
   // media
   standardXHRResponse(this.requests.shift());
   standardXHRResponse(this.requests.shift());
   QUnit.equal(updates.length, 1, 'updated the segment list');
   QUnit.equal(updates.length, 1, 'updated the segment list');
+
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, Infinity, 'Live stream');
+  QUnit.equal(this.player.tech_.hls.stats.mediaRequests, 1, '1 segment request');
+  QUnit.equal(
+    this.player.tech_.hls.stats.mediaBytesTransferred,
+    16,
+    '16 bytes downloaded');
 });
 });
 
 
 QUnit.test('selects a playlist after main/combined segment downloads', function() {
 QUnit.test('selects a playlist after main/combined segment downloads', function() {
@@ -392,6 +441,8 @@ QUnit.test('selects a playlist after main/combined segment downloads', function(
   // and another
   // and another
   this.masterPlaylistController.mainSegmentLoader_.trigger('progress');
   this.masterPlaylistController.mainSegmentLoader_.trigger('progress');
   QUnit.strictEqual(calls, 3, 'selects after additional segments');
   QUnit.strictEqual(calls, 3, 'selects after additional segments');
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, 4194304, 'default bandwidth');
 });
 });
 
 
 QUnit.test('updates the duration after switching playlists', function() {
 QUnit.test('updates the duration after switching playlists', function() {
@@ -424,6 +475,13 @@ QUnit.test('updates the duration after switching playlists', function() {
   QUnit.ok(selectedPlaylist, 'selected playlist');
   QUnit.ok(selectedPlaylist, 'selected playlist');
   QUnit.ok(this.masterPlaylistController.mediaSource.duration !== 0,
   QUnit.ok(this.masterPlaylistController.mediaSource.duration !== 0,
            'updates the duration');
            'updates the duration');
+
+  // verify stats
+  QUnit.equal(this.player.tech_.hls.stats.bandwidth, Infinity, 'Live stream');
+  QUnit.equal(this.player.tech_.hls.stats.mediaRequests, 1, '1 segment request');
+  QUnit.equal(this.player.tech_.hls.stats.mediaBytesTransferred,
+              16,
+              '16 bytes downloaded');
 });
 });
 
 
 QUnit.test('seekable uses the intersection of alternate audio and combined tracks',
 QUnit.test('seekable uses the intersection of alternate audio and combined tracks',

@@ -105,6 +105,11 @@ QUnit.test('calling load is idempotent', function() {
   this.requests.shift().respond(200, null, '');
   this.requests.shift().respond(200, null, '');
   loader.load();
   loader.load();
   QUnit.equal(this.requests.length, 0, 'load has no effect');
   QUnit.equal(this.requests.length, 0, 'load has no effect');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaTransferDuration, 100, '100 ms (clock above)');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('calling load should unpause', function() {
 QUnit.test('calling load should unpause', function() {
@@ -135,6 +140,11 @@ QUnit.test('calling load should unpause', function() {
 
 
   loader.load();
   loader.load();
   QUnit.equal(loader.paused(), false, 'unpaused');
   QUnit.equal(loader.paused(), false, 'unpaused');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaTransferDuration, 1, '1 ms (clock above)');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('regularly checks the buffer while unpaused', function() {
 QUnit.test('regularly checks the buffer while unpaused', function() {
@@ -159,6 +169,11 @@ QUnit.test('regularly checks the buffer while unpaused', function() {
   currentTime = Config.GOAL_BUFFER_LENGTH;
   currentTime = Config.GOAL_BUFFER_LENGTH;
   this.clock.tick(10 * 1000);
   this.clock.tick(10 * 1000);
   QUnit.equal(this.requests.length, 1, 'requested another segment');
   QUnit.equal(this.requests.length, 1, 'requested another segment');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaTransferDuration, 1, '1 ms (clock above)');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('does not check the buffer while paused', function() {
 QUnit.test('does not check the buffer while paused', function() {
@@ -177,6 +192,11 @@ QUnit.test('does not check the buffer while paused', function() {
 
 
   this.clock.tick(10 * 1000);
   this.clock.tick(10 * 1000);
   QUnit.equal(this.requests.length, 0, 'did not make a request');
   QUnit.equal(this.requests.length, 0, 'did not make a request');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaTransferDuration, 1, '1 ms (clock above)');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('calculates bandwidth after downloading a segment', function() {
 QUnit.test('calculates bandwidth after downloading a segment', function() {
@@ -191,7 +211,12 @@ QUnit.test('calculates bandwidth after downloading a segment', function() {
 
 
   QUnit.equal(loader.bandwidth, (10 / 100) * 8 * 1000, 'calculated bandwidth');
   QUnit.equal(loader.bandwidth, (10 / 100) * 8 * 1000, 'calculated bandwidth');
   QUnit.equal(loader.roundTrip, 100, 'saves request round trip time');
   QUnit.equal(loader.roundTrip, 100, 'saves request round trip time');
-  QUnit.equal(loader.bytesReceived, 10, 'saves bytes received');
+
+  // TODO: Bandwidth Stat will be stale??
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaTransferDuration, 100, '100 ms (clock above)');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('segment request timeouts reset bandwidth', function() {
 QUnit.test('segment request timeouts reset bandwidth', function() {
@@ -223,6 +248,10 @@ QUnit.test('appending a segment triggers progress', function() {
   mediaSource.sourceBuffers[0].trigger('updateend');
   mediaSource.sourceBuffers[0].trigger('updateend');
 
 
   QUnit.equal(progresses, 1, 'fired progress');
   QUnit.equal(progresses, 1, 'fired progress');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('only requests one segment at a time', function() {
 QUnit.test('only requests one segment at a time', function() {
@@ -251,6 +280,11 @@ QUnit.test('only appends one segment at a time', function() {
   QUnit.equal(mediaSource.sourceBuffers[0].updates_.filter(
   QUnit.equal(mediaSource.sourceBuffers[0].updates_.filter(
     update => update.append).length, 1, 'only one append');
     update => update.append).length, 1, 'only one append');
   QUnit.equal(this.requests.length, 0, 'only made one request');
   QUnit.equal(this.requests.length, 0, 'only made one request');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaTransferDuration, 100, '100 ms (clock above)');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('adjusts the playlist offset if no buffering progress is made', function() {
 QUnit.test('adjusts the playlist offset if no buffering progress is made', function() {
@@ -288,6 +322,11 @@ QUnit.test('adjusts the playlist offset if no buffering progress is made', funct
 
 
   // so the loader should try the next segment
   // so the loader should try the next segment
   QUnit.equal(this.requests[0].url, '1.ts', 'moved ahead a segment');
   QUnit.equal(this.requests[0].url, '1.ts', 'moved ahead a segment');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 20, '20 bytes');
+  QUnit.equal(loader.mediaTransferDuration, 2, '2 ms (clocks above)');
+  QUnit.equal(loader.mediaRequests, 2, '2 requests');
 });
 });
 
 
 QUnit.test('never attempt to load a segment that ' +
 QUnit.test('never attempt to load a segment that ' +
@@ -319,6 +358,11 @@ QUnit.test('never attempt to load a segment that ' +
 
 
   // the loader should move on to the next segment
   // the loader should move on to the next segment
   QUnit.equal(this.requests[0].url, '1.ts', 'moved ahead a segment');
   QUnit.equal(this.requests[0].url, '1.ts', 'moved ahead a segment');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaTransferDuration, 1, '1 ms (clocks above)');
+  QUnit.equal(loader.mediaRequests, 1, '1 requests');
 });
 });
 
 
 QUnit.test('adjusts the playlist offset if no buffering progress is made', function() {
 QUnit.test('adjusts the playlist offset if no buffering progress is made', function() {
@@ -356,6 +400,11 @@ QUnit.test('adjusts the playlist offset if no buffering progress is made', funct
 
 
   // so the loader should try the next segment
   // so the loader should try the next segment
   QUnit.equal(this.requests[0].url, '1.ts', 'moved ahead a segment');
   QUnit.equal(this.requests[0].url, '1.ts', 'moved ahead a segment');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 20, '20 bytes');
+  QUnit.equal(loader.mediaTransferDuration, 2, '2 ms (clocks above)');
+  QUnit.equal(loader.mediaRequests, 2, '2 requests');
 });
 });
 
 
 QUnit.test('adjusts the playlist offset even when segment.end is set if no' +
 QUnit.test('adjusts the playlist offset even when segment.end is set if no' +
@@ -453,6 +502,10 @@ QUnit.test('abort does not cancel segment processing in progress', function() {
 
 
   loader.abort();
   loader.abort();
   QUnit.equal(loader.state, 'APPENDING', 'still appending');
   QUnit.equal(loader.state, 'APPENDING', 'still appending');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('sets the timestampOffset on timeline change', function() {
 QUnit.test('sets the timestampOffset on timeline change', function() {
@@ -474,6 +527,10 @@ QUnit.test('sets the timestampOffset on timeline change', function() {
   this.requests[0].response = new Uint8Array(10).buffer;
   this.requests[0].response = new Uint8Array(10).buffer;
   this.requests.shift().respond(200, null, '');
   this.requests.shift().respond(200, null, '');
   QUnit.equal(mediaSource.sourceBuffers[0].timestampOffset, 10, 'set timestampOffset');
   QUnit.equal(mediaSource.sourceBuffers[0].timestampOffset, 10, 'set timestampOffset');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 20, '20 bytes');
+  QUnit.equal(loader.mediaRequests, 2, '2 requests');
 });
 });
 
 
 QUnit.test('tracks segment end times as they are buffered', function() {
 QUnit.test('tracks segment end times as they are buffered', function() {
@@ -491,6 +548,10 @@ QUnit.test('tracks segment end times as they are buffered', function() {
   ]);
   ]);
   mediaSource.sourceBuffers[0].trigger('updateend');
   mediaSource.sourceBuffers[0].trigger('updateend');
   QUnit.equal(playlist.segments[0].end, 9.5, 'updated duration');
   QUnit.equal(playlist.segments[0].end, 9.5, 'updated duration');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('segment 404s should trigger an error', function() {
 QUnit.test('segment 404s should trigger an error', function() {
@@ -548,6 +609,10 @@ QUnit.test('fires ended at the end of a playlist', function() {
   mediaSource.sourceBuffers[0].buffered = videojs.createTimeRanges([[0, 10]]);
   mediaSource.sourceBuffers[0].buffered = videojs.createTimeRanges([[0, 10]]);
   mediaSource.sourceBuffers[0].trigger('updateend');
   mediaSource.sourceBuffers[0].trigger('updateend');
   QUnit.equal(endOfStreams, 1, 'triggered ended');
   QUnit.equal(endOfStreams, 1, 'triggered ended');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('live playlists do not trigger ended', function() {
 QUnit.test('live playlists do not trigger ended', function() {
@@ -572,6 +637,10 @@ QUnit.test('live playlists do not trigger ended', function() {
   mediaSource.sourceBuffers[0].buffered = videojs.createTimeRanges([[0, 10]]);
   mediaSource.sourceBuffers[0].buffered = videojs.createTimeRanges([[0, 10]]);
   mediaSource.sourceBuffers[0].trigger('updateend');
   mediaSource.sourceBuffers[0].trigger('updateend');
   QUnit.equal(endOfStreams, 0, 'did not trigger ended');
   QUnit.equal(endOfStreams, 0, 'did not trigger ended');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('respects the global withCredentials option', function() {
 QUnit.test('respects the global withCredentials option', function() {
@@ -781,6 +850,10 @@ QUnit.test('the key is saved to the segment in the correct format', function() {
   QUnit.deepEqual(segment.key.bytes,
   QUnit.deepEqual(segment.key.bytes,
                   new Uint32Array([0, 0x01000000, 0x02000000, 0x03000000]),
                   new Uint32Array([0, 0x01000000, 0x02000000, 0x03000000]),
                   'passed the specified segment key');
                   'passed the specified segment key');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaRequests, 1, '1 request was completed');
 });
 });
 
 
 QUnit.test('supplies media sequence of current segment as the IV by default, if no IV ' +
 QUnit.test('supplies media sequence of current segment as the IV by default, if no IV ' +
@@ -811,6 +884,10 @@ function() {
 
 
   QUnit.deepEqual(segment.key.iv, new Uint32Array([0, 0, 0, 5]),
   QUnit.deepEqual(segment.key.iv, new Uint32Array([0, 0, 0, 5]),
                   'the IV for the segment is the media sequence');
                   'the IV for the segment is the media sequence');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('segment with key has decrypted bytes appended during processing', function() {
 QUnit.test('segment with key has decrypted bytes appended during processing', function() {
@@ -839,6 +916,10 @@ QUnit.test('segment with key has decrypted bytes appended during processing', fu
   // Allow the decrypter's async stream to run the callback
   // Allow the decrypter's async stream to run the callback
   this.clock.tick(1);
   this.clock.tick(1);
   QUnit.ok(loader.pendingSegment_.bytes, 'decrypted bytes in segment');
   QUnit.ok(loader.pendingSegment_.bytes, 'decrypted bytes in segment');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 8, '8 bytes');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('calling load with an encrypted segment waits for both key and segment ' +
 QUnit.test('calling load with an encrypted segment waits for both key and segment ' +
@@ -864,6 +945,10 @@ QUnit.test('calling load with an encrypted segment waits for both key and segmen
   keyRequest.response = new Uint32Array([0, 0, 0, 0]).buffer;
   keyRequest.response = new Uint32Array([0, 0, 0, 0]).buffer;
   keyRequest.respond(200, null, '');
   keyRequest.respond(200, null, '');
   QUnit.equal(loader.state, 'DECRYPTING', 'moves to decrypting state');
   QUnit.equal(loader.state, 'DECRYPTING', 'moves to decrypting state');
+
+  // verify stats
+  QUnit.equal(loader.mediaBytesTransferred, 10, '10 bytes');
+  QUnit.equal(loader.mediaRequests, 1, '1 request');
 });
 });
 
 
 QUnit.test('key request timeouts reset bandwidth', function() {
 QUnit.test('key request timeouts reset bandwidth', function() {