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diff --git a/dom/media/webrtc/tests/mochitests/test_getUserMedia_audioCapture.html b/dom/media/webrtc/tests/mochitests/test_getUserMedia_audioCapture.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test AudioCapture </title>
+  <script type="application/javascript" src="mediaStreamPlayback.js"></script>
+</head>
+<body>
+<pre id="test">
+<script>
+
+(async () => {
+  await createHTML({
+    bug: "1156472",
+    title: "Test AudioCapture with regular HTMLMediaElement, AudioContext, " +
+           "and HTMLMediaElement playing a MediaStream",
+    visible: true
+  });
+
+  await runTestWhenReady(async () => {
+    // Reduce noise for when --use-test-media-devices is not in use.
+    await SpecialPowers.pushPrefEnv({ set: [[ "media.volume_scale", "0.0" ]] });
+    /**
+     * Get two HTMLMediaElements:
+     * - One playing a sine tone from a blob (of an opus file created on the fly)
+     * - One being the output for an AudioContext's OscillatorNode, connected to
+     *   a MediaSourceDestinationNode.
+     *
+     * Also, use the AudioContext playing through its AudioDestinationNode another
+     * tone, using another OscillatorNode.
+     *
+     * Capture the output of the document, feed that back into the AudioContext,
+     * with an AnalyserNode, and check the frequency content to make sure we
+     * have recorded the three sources.
+     *
+     * The three sine tones have frequencies far apart from each other, so that we
+     * can check that the spectrum of the capture stream contains three
+     * components with a high magnitude.
+     */
+    const decodedTone = createMediaElement("audio", "decodedTone");
+    decodedTone.muted = false;
+    const decodedToneMuted = createMediaElement("audio", "decodedToneMuted");
+    const acTone = createMediaElement("audio", "audioContextTone");
+    acTone.muted = false;
+    const acToneMuted = createMediaElement("audio", "audioContextToneMuted");
+    const micTone = createMediaElement("audio", "audioContextTone");
+    micTone.muted = false;
+    const ac = new AudioContext();
+    const constraints = {audio: {mediaSource: "audioCapture"}};
+    const stream = await getUserMedia(constraints);
+    const analyser = new AudioStreamAnalyser(ac, stream);
+
+    const osc200 = ac.createOscillator();
+    osc200.frequency.value = analyser.frequencyForBinIndex(200);
+    const osc250 = ac.createOscillator();
+    osc250.frequency.value = analyser.frequencyForBinIndex(250);
+    const oscThroughAudioDestinationNode = ac.createOscillator();
+    oscThroughAudioDestinationNode.frequency.value =
+      analyser.frequencyForBinIndex(100);
+    const msDest200 = ac.createMediaStreamDestination();
+    const msDest250 = ac.createMediaStreamDestination();
+
+    osc200.connect(msDest200);
+    osc250.connect(msDest250);
+    oscThroughAudioDestinationNode.connect(ac.destination);
+
+    acTone.srcObject = msDest200.stream;
+    acToneMuted.srcObject = msDest250.stream;
+
+    // The fake microphone uses signed 16-bit audio data:
+    await SpecialPowers.pushPrefEnv({ set: [
+      [
+        "media.navigator.audio.fake_frequency",
+        analyser.frequencyForBinIndex(300)
+      ]
+    ]});
+    const micStream = await navigator.mediaDevices.getUserMedia({
+      'audio': true, 'fake': true
+    });
+    micTone.srcObject = micStream;
+
+    decodedTone.src = "/tests/dom/media/test/sin-441-1s-44100.flac";
+    decodedToneMuted.src = "/tests/dom/media/test/sin-441-1s-44100.flac";
+    decodedTone.preservesPitch = false;
+    decodedToneMuted.preservesPitch = false;
+    decodedTone.playbackRate = analyser.frequencyForBinIndex(20) / 441;
+    ok(decodedTone.playbackRate >= 1/16, "within firefox min playback rate");
+    decodedToneMuted.playbackRate = analyser.frequencyForBinIndex(40) / 441;
+    ok(decodedToneMuted.playbackRate <= 16, "within firefox max playback rate");
+    osc200.start();
+    osc250.start();
+    oscThroughAudioDestinationNode.start();
+    decodedTone.loop = true;
+    decodedToneMuted.loop = true;
+    decodedTone.play();
+    decodedToneMuted.play();
+    acTone.play();
+    acToneMuted.play();
+
+    let frequencyBytes;
+    try {
+      analyser.enableDebugCanvas();
+      await analyser.waitForAnalysisSuccess(array => {
+        // We want to find three frequency components here.
+        // Frequencies are logarithmic. Also make sure we have low
+        // energy in between, not just a flat white noise.
+        if (array[10]  == 0 &&
+            array[20]  == 255 &&
+            array[40]  == 0 &&
+            array[70]  == 0 &&
+            array[100] == 255 &&
+            array[150] == 0 &&
+            array[200] == 255 &&
+            array[300] >  240) {
+          frequencyBytes = new Uint8Array(array);
+          return true;
+        }
+        return false;
+      });
+    } finally {
+      await ac.close();
+      for (let t of [...stream.getTracks(), ...micStream.getTracks()]) {
+        t.stop();
+      }
+    }
+    todo(frequencyBytes[250] < 50, "muted MediaStream srcObject - bug 1864067");
+  });
+})();
+</script>
+</pre>
+</body>
+</html>