Display active audio streams on chrome://media-internals.

chrome/browser/resources/media_internals.js

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// The <ul> holding the audio streams.
+var audioStreams;
+
+// Returns the first item in itemList with id > item.id or null if none exist.
+getFollowing = function(item, itemList) {
+  var length = itemList.length;
+  for (var i = 0; i < length; i++) {
+    if (itemList[i].id > item.id)
+      return itemList(i);
+  }
+  return null;
+};
+
+// Returns an English description of the status of |stream|.

[scherkus (not reviewing), 2011/07/01 17:47:42]

nit: s/an English/a text/ ?

[Scott Franklin, 2011/07/02 00:57:20]

Done.

+audioStreamDetails = function(stream) {
+  return stream.id + ' is ' + (stream.playing ? 'playing' : 'paused') +
+      ' at ' + Math.round(stream.volume*100) + '% volume.';

[scherkus (not reviewing), 2011/07/01 17:47:42]

nit: spacing on *

[Scott Franklin, 2011/07/02 00:57:20]

Done.

+};
+
+onAudioUpdate = function(args) {
+  var stream = document.getElementById(args.id);
+  if(!stream) {

[scherkus (not reviewing), 2011/07/01 17:47:42]

nit: spacing

[Scott Franklin, 2011/07/02 00:57:20]

Line removed.

+    stream=document.createElement('li');

[scherkus (not reviewing), 2011/07/01 17:47:42]

nit: spacing on =

[Scott Franklin, 2011/07/02 00:57:20]

Line removed.

+    stream.setAttribute('id', args.id);
+
+    // Insert the new stream into the sorted list.
+    audioStreams.insertBefore(
+        stream, getFollowing(stream, audioStreams.children));
+  }
+  stream.innerHTML = audioStreamDetails(args);
+  stream.className = args.status;
+};
+
+onReceiveEverything = function(args) {
+  for (i in args.audio_streams) {
+    for (j in args.audio_streams[i]) {
+      for (k in args.audio_streams[i][j]) {
+        onAudioUpdate(args.audio_streams[i][j][k]);
+      }
+    }
+  }
+};
+
+onItemDeleted = function(args) {
+  var stream = document.getElementById(args);
+  if(stream)

[scherkus (not reviewing), 2011/07/01 17:47:42]

nit: spacing

[Scott Franklin, 2011/07/02 00:57:20]

Line removed.

+    audioStreams.removeChild(stream);
+};
+
+window.onload = function() {
+  audioStreams = document.getElementById('audio_streams');
+
+  // Get information about all currently active media.
+  chrome.send('getEverything');
+};