The Tor Browser: content/media/test/test_playback_rate.html@44a2da4a2ab2 (annotated)

content/media/test/test_playback_rate.html@44a2da4a2ab2 (annotated)

content/media/test/test_playback_rate.html

Fri, 16 Jan 2015 04:50:19 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 04:50:19 +0100
branch: TOR_BUG_9701
changeset 13: 44a2da4a2ab2
permissions: -rw-r--r--

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

 <!DOCTYPE HTML>
 <html>
 <head>
   <title>Test for the playbackRate property </title>
   <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
   <script type="text/javascript" src="manifest.js"></script>
 </head>
 <body>
 <pre id="test">
 <script class="testbody" type='application/javascript;version=1.8'>
 SimpleTest.expectAssertions(0, 2);
 if (navigator.platform.startsWith("Win")) {
   SimpleTest.expectAssertions(0, 1);
 } else if (navigator.platform.startsWith("Mac")) {
   SimpleTest.expectAssertions(0, 2);
 }
 let manager = new MediaTestManager;
 function rangeCheck(lhs, rhs, threshold) {
   var diff = Math.abs(lhs - rhs);
   if (diff < threshold) {
     return true;
   }
   return false;
 }
 function checkPlaybackRate(wallclock, media, expected, threshold) {
   if (rangeCheck(media / wallclock, expected, threshold)) {
     return true;
   }
   return false;
 }
 // Those value are expected to match those at the top of HTMLMediaElement.cpp.
 let VERY_SLOW_RATE = 0.1,
     SLOW_RATE = 0.25,
     FAST_RATE = 5,
     VERY_FAST_RATE = 20,
     NULL_RATE = 0.0;
 function ontimeupdate(e) {
   var t = e.target;
   if (t.gotEnded) {
     return;
   }
   t.testedForSlowdown = true;
   if (t.currentTime > t.duration / 2) {
     t.oldCurrentTime = t.currentTime;
     t.timestamp = Date.now();
     var delta = t.oldCurrentTime,
         delta_wallclock = (t.timestamp - t.startTimestamp - t.bufferingTime) / 1000;
     t.mozPreservesPitch = false;
     is(t.mozPreservesPitch, false, "If we disable the pitch preservation, it should appear as such.");
     t.bufferingTime = 0;
     is(t.playbackRate, SLOW_RATE,
         "The playback rate shoud be "+SLOW_RATE+"." + t.token);
     ok(checkPlaybackRate(delta_wallclock, delta, SLOW_RATE, 0.25), "We are effectively slowing down playback. (" + delta_wallclock + ", " + delta + ") for " + t.token);
     t.removeEventListener("timeupdate", ontimeupdate);
     t.addEventListener("pause", onpaused);
     t.playbackRate = NULL_RATE;
     t.oldCurrentTime = t.currentTime;
     setTimeout(function() {
       afterNullPlaybackRate(e);
     }, 100);
   }
 }
 function onpaused(e) {
   var t = e.target;
   t.pausedReceived = true;
 }
 function afterNullPlaybackRate(e) {
   var t = e.target;
   t.testedForNull = true;
   if (t.gotEnded) {
     return;
   }
   // The currentTime won't be perfectly equal because of the latency
   // compensation. We expect no more that 300ms difference.
   let THRESHOLD = 0.3;
   ok(rangeCheck(t.currentTime, t.oldCurrentTime, THRESHOLD), "Current time should not change when playbackRate is null (" + t.currentTime + " " + t.oldCurrentTime + ").");
   ok(!t.paused, "The element should not be in paused state.");
   t.removeEventListener("paused", onpaused);
   is(t.pausedReceived, undefined, "Paused event should not have been received.");
   t.timestamp = Date.now();
   t.oldCurrentTime = t.currentTime;
   t.playbackRate = VERY_FAST_RATE;
   is(t.playbackRate, FAST_RATE, "Playback rate should be clamped to " + FAST_RATE + ".");
 }
 function onended(e) {
   var t = e.target,
       playtime = (Date.now() - t.timestamp - t.bufferingTime) / 1000,
       mediaTime = t.duration - t.oldCurrentTime;
   if (!(t.testedForSlowdown && t.testedForNull)) {
     t.gotEnded = true;
     t.skippedFastPart = true;
   }
   t.bufferingTime = 0;
   // We got "ended" too early, skip these tests.
   if (t.testedForSlowdown && t.testedForNull) {
     is(t.playbackRate, FAST_RATE, "The playback rate should still be "+FAST_RATE+".");
     ok(!t.muted, "The audio should be muted when playing at high speed, but should not appear as such.");
     is(t.currentTime, t.duration, "Current time should be equal to the duration (not change by playback rate).");
   }
   finish_test(t);
 }
 function onratechange(e) {
   if (!e.target.ratechangecount) {
     e.target.ratechangecount = 0;
   }
   e.target.ratechangecount++;
 }
 function finish_test(element) {
   if (element.parentNode)
     element.parentNode.removeChild(element);
   element.src="";
   manager.finished(element.token);
 }
 // These two functions handle the case when the playback pauses for buffering. It
 // adjusts the timestamps to be accurate. Despite the fact that the web servers
 // is supposed to be on the same machine, buffering pauses can occur (rarely,
 // but still).
 function onplaying(e) {
   var t = e.target;
   if (t.bufferingTimestamp != undefined) {
     t.bufferingTime += (Date.now() - t.bufferingTimestamp);
     t.bufferingTimestamp = undefined;
   }
 }
 function onwaiting(e) {
   var t = e.target;
   t.bufferingTimestamp = Date.now();
 }
 function onvolumechange(e) {
   ok(false, "We should not receive a volumechange event when changing the playback rate.");
 }
 function startTest(test, token) {
   let elemType = /^audio/.test(test.type) ? "audio" : "video";
   let element = document.createElement(elemType);
   element.src = test.name;
   element.preload = "metadata";
   element.token = token;
   element.controls = true;
   element.bufferingTime = 0;
   document.body.appendChild(element);
   element.addEventListener("ratechange", onratechange);
   element.addEventListener("timeupdate", ontimeupdate);
   element.addEventListener("ended", onended);
   element.addEventListener("waiting", onwaiting);
   element.addEventListener("playing", onplaying);
   element.addEventListener("volumechange", onvolumechange);
   manager.started(token);
   element.startTimestamp = Date.now();
   is(element.mozPreservesPitch, true, "Pitch preservation should be enabled by default.");
   element.addEventListener("loadedmetadata", function() {
     is(element.playbackRate, 1.0, "playbackRate should be initially 1.0");
     is(element.defaultPlaybackRate, 1.0, "defaultPlaybackRate should be initially 1.0");
     element.playbackRate = VERY_SLOW_RATE;
     is(element.playbackRate, SLOW_RATE, "PlaybackRate should be clamped to " + SLOW_RATE + ".");
     element.play();
     element.playbackRate = SLOW_RATE;
   });
 }
 manager.runTests(gPlayedTests, startTest);
 </script>
 </pre>
 <div id="elements">
 </div>
 </body>
 </html>

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content/media/test/test_playback_rate.html