Bug 1190040 - Do not dispatch media-playback notifications for media elements that do not have an audio track; r=baku

2015-08-01 10:17:56 -04:00 · 2015-08-01 10:17:56 -04:00 · 9e8a849881
--- a/dom/base/test/mochitest.ini
+++ b/dom/base/test/mochitest.ini
@ -242,6 +242,7 @@ support-files =
  file_webaudioLoop.html
  file_webaudioLoop2.html
  file_pluginAudio.html
+  noaudio.webm
  referrer_helper.js
  referrer_testserver.sjs
  script_postmessages_fileList.js
@ -299,6 +300,7 @@ skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android' || e1
 [test_named_frames.html]
 [test_navigator_resolve_identity.html]
 [test_navigator_language.html]
+[test_noAudioNotification.html]
 [test_openDialogChromeOnly.html]
 [test_open_null_features.html]
 skip-if = (buildapp == 'b2g' && toolkit != 'gonk') # Fails on b2g-desktop, tracked in bug 1011874
--- a/dom/base/test/noaudio.webm
+++ b/dom/base/test/noaudio.webm
--- a/dom/base/test/test_noAudioNotification.html
+++ b/dom/base/test/test_noAudioNotification.html
@ -0,0 +1,81 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for video controller in windows</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<pre id="test">
+</pre>
+
+<script type="application/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+var observer = {
+  observe: function(subject, topic, data) {
+    ok(false, "should not receive media-playback notification!");
+  }
+};
+
+var observerService = SpecialPowers.Cc["@mozilla.org/observer-service;1"]
+                                   .getService(SpecialPowers.Ci.nsIObserverService);
+
+var video = document.createElement("video");
+video.loop = true;
+video.src = "noaudio.webm";
+
+video.onplay = video.onpause  = function() {
+  // Yield to the event loop a few times to make sure that media-playback is not dispatched.
+  SimpleTest.executeSoon(function() {
+    SimpleTest.executeSoon(function() {
+      SimpleTest.executeSoon(function() {
+        runTest();
+      });
+    });
+  });
+};
+
+var tests = [
+  function() {
+    SpecialPowers.pushPrefEnv({"set": [["media.useAudioChannelService", true]]}, runTest);
+  },
+
+  function() {
+    observerService.addObserver(observer, "media-playback", false);
+    ok(true, "Observer set");
+    runTest();
+  },
+
+  function() {
+    video.play();
+  },
+
+  function() {
+    video.pause();
+  },
+
+  function() {
+    observerService.removeObserver(observer, "media-playback");
+    ok(true, "Observer removed");
+    runTest();
+  }
+];
+
+function runTest() {
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+
+  var test = tests.shift();
+  test();
+}
+
+runTest();
+
+</script>
+</body>
+</html>
+
--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@ -4504,6 +4504,11 @@ void HTMLMediaElement::UpdateAudioChannelPlayingState()
 void
 HTMLMediaElement::NotifyAudioChannelAgent(bool aPlaying)
 {
+  // Don't do anything if this element doesn't have any audio tracks.
+  if (!HasAudio()) {
+    return;
+  }
+
  // Immediately check if this should go to the MSG instead of the normal
  // media playback route.
  WindowAudioCaptureChanged();