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+<!DOCTYPE HTML>
+<html>
+<meta charset="utf-8">
+<head>
+ <title>Test MediaStreamAudioSourceNode doesn't get data from cross-origin media resources</title>
+ <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+function binIndexForFrequency(frequency, analyser) {
+ return 1 + Math.round(frequency *
+ analyser.fftSize /
+ analyser.context.sampleRate);
+}
+
+function debugCanvas(analyser) {
+ var cvs = document.createElement("canvas");
+ document.body.appendChild(cvs);
+
+ // Easy: 1px per bin
+ cvs.width = analyser.frequencyBinCount;
+ cvs.height = 256;
+ cvs.style.border = "1px solid red";
+
+ var c = cvs.getContext('2d');
+ var buf = new Uint8Array(analyser.frequencyBinCount);
+
+ function render() {
+ c.clearRect(0, 0, cvs.width, cvs.height);
+ analyser.getByteFrequencyData(buf);
+ for (var i = 0; i < buf.length; i++) {
+ c.fillRect(i, (256 - (buf[i])), 1, 256);
+ }
+ requestAnimationFrame(render);
+ }
+ requestAnimationFrame(render);
+}
+
+
+function checkFrequency(an) {
+ an.getFloatFrequencyData(frequencyArray);
+ // We should have no energy when checking the data largely outside the index
+ // for 440Hz (the frequency of the sine wave), start checking an octave above,
+ // the Opus compression can add some harmonics to the pure since wave.
+ var index = binIndexForFrequency(880, an);
+ var underTreshold = true;
+ for (var i = index; i < frequencyArray.length; i++) {
+ // Let some slack, there might be some noise here because of int -> float
+ // conversion or the Opus encoding.
+ if (frequencyArray[i] > an.minDecibels + 40) {
+ return false;
+ }
+ }
+
+ // On the other hand, we should find a peak at 440Hz. Our sine wave is not
+ // attenuated, we're expecting the peak to reach 0dBFs.
+ index = binIndexForFrequency(440, an);
+ info("energy at 440: " + frequencyArray[index] + ", threshold " + (an.maxDecibels - 10));
+ if (frequencyArray[index] < (an.maxDecibels - 10)) {
+ return false;
+ }
+
+ return true;
+}
+
+var audioElement = new Audio();
+audioElement.src = 'sine-440-10s.opus'
+audioElement.loop = true;
+var ac = new AudioContext();
+var mediaElementSource = ac.createMediaElementSource(audioElement);
+var an = ac.createAnalyser();
+frequencyArray = new Float32Array(an.frequencyBinCount);
+
+// Uncomment this to check what the analyser is doing.
+// debugCanvas(an);
+
+mediaElementSource.connect(an)
+
+audioElement.play();
+// We want to check the we have the expected audio for at least two loop of
+// the HTMLMediaElement, piped into an AudioContext. The file is ten seconds,
+// and we use the default FFT size.
+var lastCurrentTime = 0;
+var loopCount = 0;
+audioElement.onplaying = function() {
+ audioElement.ontimeupdate = function() {
+ // We don't run the analysis when close to loop point or at the
+ // beginning, since looping is not seamless, there could be an
+ // unpredictable amount of silence
+ var rv = checkFrequency(an);
+ info("currentTime: " + audioElement.currentTime);
+ if (audioElement.currentTime < 4 ||
+ audioElement.currentTIme > 8){
+ return;
+ }
+ if (!rv) {
+ ok(false, "Found unexpected noise during analysis.");
+ audioElement.ontimeupdate = null;
+ audioElement.onplaying = null;
+ ac.close();
+ audioElement.src = '';
+ SimpleTest.finish()
+ return;
+ }
+ ok(true, "Found correct audio signal during analysis");
+ info(lastCurrentTime + " " + audioElement.currentTime);
+ if (lastCurrentTime > audioElement.currentTime) {
+ info("loopCount: " + loopCount);
+ if (loopCount > 1) {
+ audioElement.ontimeupdate = null;
+ audioElement.onplaying = null;
+ ac.close();
+ audioElement.src = '';
+ SimpleTest.finish();
+ }
+ lastCurrentTime = audioElement.currentTime;
+ loopCount++;
+ } else {
+ lastCurrentTime = audioElement.currentTime;
+ }
+ }
+}
+
+</script>