Graph bandwidth on the stats page

Fix the stats page to work with video.js 5. Get the measured bitrate graph updating in real time.

@@ -23,7 +23,9 @@
 
   <!-- Media Sources plugin -->
   <script src="../../node_modules/videojs-contrib-media-sources/src/videojs-media-sources.js"></script>
-
+  <script>
+    videojs.MediaSource.webWorkerURI = '../../node_modules/videojs-contrib-media-sources/src/transmuxer_worker.js';
+  </script>
   <!-- HLS plugin -->
   <script src="../../src/videojs-hls.js"></script>
 
@@ -77,12 +79,11 @@
   </video>
   <section class="stats">
     <h2>Player Stats</h2>
-    <div class="segment-timeline"></div>
     <dl>
       <dt>Current Time:</dt>
       <dd class="current-time-stat">0</dd>
       <dt>Buffered:</dt>
-      <dd><span class="buffered-start-stat">-</span> - <span class="buffered-end-stat">-</span></dd>
+      <dd class="buffered-stat">-</dd>
       <dt>Seekable:</dt>
       <dd><span class="seekable-start-stat">-</span> - <span class="seekable-end-stat">-</span></dd>
       <dt>Video Bitrate:</dt>
@@ -90,10 +91,13 @@
       <dt>Measured Bitrate:</dt>
       <dd class="measured-bitrate-stat">0 kbps</dd>
     </dl>
+    <h3>Bitrate Switching</h3>
     <div class="switching-stats">
       Once the player begins loading, you'll see information about the
       operation of the adaptive quality switching here.
     </div>
+    <h3>Timed Metadata</h3>
+    <div class="segment-timeline"></div>
   </section>
 
   <script src="stats.js"></script>
@@ -107,8 +111,7 @@
     // ------------
 
     var currentTimeStat = document.querySelector('.current-time-stat');
-    var bufferedStartStat = document.querySelector('.buffered-start-stat');
-    var bufferedEndStat = document.querySelector('.buffered-end-stat');
+    var bufferedStat = document.querySelector('.buffered-stat');
     var seekableStartStat = document.querySelector('.seekable-start-stat');
     var seekableEndStat = document.querySelector('.seekable-end-stat');
     var videoBitrateState = document.querySelector('.video-bitrate-stat');
@@ -119,20 +122,17 @@
     });
 
     player.on('progress', function() {
-      var oldStart, oldEnd;
+      var bufferedText = '', oldStart, oldEnd, i;
+
       // buffered
       var buffered = player.buffered();
       if (buffered.length) {
-
-        oldStart = bufferedStartStat.textContent;
-        if (buffered.start(0).toFixed(1) !== oldStart) {
-          bufferedStartStat.textContent = buffered.start(0).toFixed(1);
-        }
-        oldEnd = bufferedEndStat.textContent;
-        if (buffered.end(0).toFixed(1) !== oldEnd) {
-          bufferedEndStat.textContent = buffered.end(0).toFixed(1);
-        }
+        bufferedText += buffered.start(0) + ' - ' + buffered.end(0);
+      }
+      for (i = 1; i < buffered.length; i++) {
+        bufferedText += ', ' + buffered.start(i) + ' - ' + buffered.end(i);
       }
+      bufferedStat.textContent = bufferedText;
 
       // seekable
       var seekable = player.seekable();
@@ -149,14 +149,14 @@
       }
 
       // bitrates
-      var playlist = player.tech.hls.playlists.media();
+      var playlist = player.tech_.hls.playlists.media();
       if (playlist && playlist.attributes && playlist.attributes.BANDWIDTH) {
         videoBitrateState.textContent = (playlist.attributes.BANDWIDTH / 1024).toLocaleString(undefined, {
           maximumFractionDigits: 1
         }) + ' kbps';
       }
-      if (player.tech.hls.bandwidth) {
-        measuredBitrateStat.textContent = (player.tech.hls.bandwidth / 1024).toLocaleString(undefined, {
+      if (player.tech_.hls.bandwidth) {
+        measuredBitrateStat.textContent = (player.tech_.hls.bandwidth / 1024).toLocaleString(undefined, {
           maximumFractionDigits: 1
         }) + ' kbps';
       }

@@ -4,10 +4,15 @@
 }
 
 .axis line,
-.axis path,
-.intersect {
+.axis path {
+  fill: none;
+  stroke: #111;
+}
+
+.bitrates {
   fill: none;
-  stroke: #000;
+  stroke: steelblue;
+  stroke-width: 3px;
 }
 
 .cue {
@@ -23,6 +28,6 @@
 
 .intersect {
   fill: none;
-  stroke: #000;
+  stroke: #111;
   stroke-dasharray: 2,2;
 }

@@ -7,9 +7,35 @@
 
   var d3 = window.d3;
 
-  var setupGraph = function(element) {
-    element.innerHTML = '';
+  var bitrateTickFormatter = d3.format(',.0f');
 
+  var updateBitrateAxes = function(svg, xScale, yScale) {
+    var xAxis = d3.svg.axis().scale(xScale).orient('bottom');
+    svg.select('.axis.x')
+      .transition().duration(500)
+      .call(xAxis);
+
+    var yAxis = d3.svg.axis().scale(yScale)
+        .tickFormat(function(value) {
+          return bitrateTickFormatter(value / 1024);
+        }).orient('left');
+    svg.select('.axis.y')
+      .transition().duration(500)
+      .call(yAxis);
+  };
+
+  var updateBitrates = function(svg, x, y, measuredBitrateKbps) {
+    var bitrates, line;
+
+    bitrates = svg.selectAll('.bitrates').datum(measuredBitrateKbps);
+    line = d3.svg.line()
+      .x(function(bitrate) { return x(bitrate.time); })
+      .y(function(bitrate) { return y(bitrate.value); });
+
+    bitrates.transition().duration(500).attr('d', line);
+  };
+
+  var setupGraph = function(element, player) {
     // setup the display
     var margin = {
       top: 20,
@@ -30,15 +56,14 @@
     var x = d3.time.scale().range([0, width]); // d3.scale.linear().range([0, width]);
     var y = d3.scale.linear().range([height, 0]);
 
-    x.domain([new Date(), new Date(Date.now() + (5 * 60 * 1000))]);
+    x.domain([new Date(), new Date(Date.now() + (1 * 60 * 1000))]);
     y.domain([0, 5 * 1024 * 1024 * 8]);
 
     var timeAxis = d3.svg.axis().scale(x).orient('bottom');
-    var tickFormatter = d3.format(',.0f');
     var bitrateAxis = d3.svg.axis()
         .scale(y)
         .tickFormat(function(value) {
-          return tickFormatter(value / 1024);
+          return bitrateTickFormatter(value / 1024);
         })
         .orient('left');
 
@@ -60,6 +85,26 @@
       .style('text-anchor', 'end')
       .text('Bitrate (kb/s)');
 
+    svg.append('path')
+      .attr('class', 'bitrates');
+
+    var measuredBitrateKbps = [{
+      time: new Date(),
+      value: player.tech_.hls.bandwidth || 0
+    }];
+
+    player.on('progress', function() {
+      measuredBitrateKbps.push({
+        time: new Date(),
+        value: player.tech_.hls.bandwidth || 0
+      });
+      x.domain([x.domain()[0], new Date()]);
+      y.domain([0, d3.max(measuredBitrateKbps, function(bitrate) {
+        return bitrate.value;
+      })]);
+      updateBitrateAxes(svg, x, y);
+      updateBitrates(svg, x, y, measuredBitrateKbps);
+    });
   };
 
   // ---------------
@@ -86,8 +131,8 @@
 
   var mediaDomain = function(media, player) {
     var segments = media.segments;
-    var end = player.tech.hls.playlists.expiredPreDiscontinuity_;
-    end += player.tech.hls.playlists.expiredPostDiscontinuity_;
+    var end = player.tech_.hls.playlists.expiredPreDiscontinuity_;
+    end += player.tech_.hls.playlists.expiredPostDiscontinuity_;
     end += Playlist.duration(media,
                              media.mediaSequence,
                              media.mediaSequence + segments.length);
@@ -160,7 +205,7 @@
       .call(ptsAxis);
   };
   var svgRenderSegmentTimeline = function(container, player) {
-    var media = player.tech.hls.playlists.media();
+    var media = player.tech_.hls.playlists.media();
     var segments = media.segments; // media.segments.slice(0, count);
 
     // setup the display
@@ -196,7 +241,7 @@
 
     // update everything on progress
     player.on('progress', function() {
-      var updatedMedia = player.tech.hls.playlists.media();
+      var updatedMedia = player.tech_.hls.playlists.media();
       var segments = updatedMedia.segments; // updatedMedia.segments.slice(currentIndex, currentIndex + count);
 
       if (updatedMedia.mediaSequence !== media.mediaSequence) {
@@ -220,7 +265,7 @@
   };
 
   var displayCues = function(container, player) {
-    var media = player.tech.hls.playlists.media();
+    var media = player.tech_.hls.playlists.media();
     if (media && media.segments) {
       svgRenderSegmentTimeline(container, player);
     } else {