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+<!DOCTYPE HTML>
+<html>
+<head>
+  <script type="application/javascript" src="mediaStreamPlayback.js"></script>
+</head>
+<body>
+<pre id="test">
+
+<script>
+  createHTML({
+    title: "getUserMedia Basic Audio Test Loopback",
+    bug: "1406350",
+    visible: true
+  });
+
+  /**
+   * Run a test to verify the use of LoopbackTone as audio input.
+   */
+  runTest(async () => {
+    if (!SpecialPowers.getCharPref("media.audio_loopback_dev", "")) {
+      todo(false, "No loopback device set by framework. Try --use-test-media-devices");
+      return;
+    }
+
+    // At this point DefaultLoopbackTone has been instantiated
+    // automatically on frequency TEST_AUDIO_FREQ (440 Hz). Verify
+    // that a tone is detected on that frequency.
+    info("Capturing at default frequency");
+    const stream = await getUserMedia({audio: true});
+
+    try {
+      const audioContext = new AudioContext();
+      const analyser = new AudioStreamAnalyser(audioContext, stream);
+      analyser.enableDebugCanvas();
+      await analyser.waitForAnalysisSuccess(array => {
+        // High energy on 1000 Hz low energy around that
+        const freg_50Hz   = array[analyser.binIndexForFrequency(50)];
+        const freq        = array[analyser.binIndexForFrequency(TEST_AUDIO_FREQ)];
+        const freq_2000Hz = array[analyser.binIndexForFrequency(2000)];
+
+        info("Analysing audio frequency - low:target:high = "
+                + freg_50Hz + ':' + freq + ':' + freq_2000Hz);
+        return freg_50Hz < 50 && freq > 200 && freq_2000Hz < 50;
+      });
+
+      // Use the LoopbackTone API to change the frequency of the default tone.
+      // Verify that a tone is detected on the new frequency (800 Hz).
+      info("Change loopback tone frequency");
+      DefaultLoopbackTone.changeFrequency(800);
+      await analyser.waitForAnalysisSuccess(array => {
+        const freg_50Hz   = array[analyser.binIndexForFrequency(50)];
+        const freq        = array[analyser.binIndexForFrequency(800)];
+        const freq_2000Hz = array[analyser.binIndexForFrequency(2000)];
+
+        info("Analysing audio frequency - low:target:high = "
+                + freg_50Hz + ':' + freq + ':' + freq_2000Hz);
+        return freg_50Hz < 50 && freq > 200 && freq_2000Hz < 50;
+      });
+
+      // Create a second tone at a different frequency.
+      // Verify that both tones are detected.
+      info("Multiple loopback tones");
+      DefaultLoopbackTone.changeFrequency(TEST_AUDIO_FREQ);
+      const second_tone = new LoopbackTone(audioContext, 2000);
+      second_tone.start();
+      await analyser.waitForAnalysisSuccess(array => {
+        const freg_50Hz   = array[analyser.binIndexForFrequency(50)];
+        const freq        = array[analyser.binIndexForFrequency(TEST_AUDIO_FREQ)];
+        const freq_2000Hz = array[analyser.binIndexForFrequency(2000)];
+        const freq_4000Hz = array[analyser.binIndexForFrequency(4000)];
+
+        info("Analysing audio frequency - low:target1:target2:high = "
+                + freg_50Hz + ':' + freq + ':' + freq_2000Hz + ':' + freq_4000Hz);
+        return freg_50Hz < 50 && freq > 200 && freq_2000Hz > 200 && freq_4000Hz < 50;
+      });
+
+      // Stop all tones and verify that there is no audio on the given frequencies.
+      info("Stop all loopback tones");
+      DefaultLoopbackTone.stop();
+      second_tone.stop()
+      await analyser.waitForAnalysisSuccess(array => {
+        const freg_50Hz   = array[analyser.binIndexForFrequency(50)];
+        const freq        = array[analyser.binIndexForFrequency(TEST_AUDIO_FREQ)];
+        const freq_2000Hz = array[analyser.binIndexForFrequency(2000)];
+
+        info("Analysing audio frequency - low:target:high = "
+                + freg_50Hz + ':' + freq + ':' + freq_2000Hz);
+        return freg_50Hz < 50 && freq < 50 && freq_2000Hz < 50;
+      });
+    } finally {
+      for (let t of stream.getTracks()) {
+        t.stop();
+      }
+    }
+  });
+</script>
+</pre>
+</body>
+</html>