tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

test_getUserMedia_basicAudio_loopback.html (3989B)

      1 <!DOCTYPE HTML>
      2 <html>
      3 <head>
      4  <script type="application/javascript" src="mediaStreamPlayback.js"></script>
      5 </head>
      6 <body>
      7 <pre id="test">
      8 
      9 <script>
     10  createHTML({
     11    title: "getUserMedia Basic Audio Test Loopback",
     12    bug: "1406350",
     13    visible: true
     14  });
     15 
     16  /**
     17   * Run a test to verify the use of LoopbackTone as audio input.
     18   */
     19  runTest(async () => {
     20    if (!SpecialPowers.getCharPref("media.audio_loopback_dev", "")) {
     21      todo(false, "No loopback device set by framework. Try --use-test-media-devices");
     22      return;
     23    }
     24 
     25    // Start a tone so that the gUM call will record something.
     26    const audioContext = new AudioContext();
     27    let tone = new LoopbackTone(audioContext, TEST_AUDIO_FREQ);
     28    tone.start();
     29    // At this point a tone has been instantiated on frequency
     30    // TEST_AUDIO_FREQ (1 kHz). Verify that a tone is detected on that
     31    // frequency.
     32    info("Capturing at default frequency");
     33    const stream = await getUserMedia({audio: true});
     34 
     35    try {
     36      const analyser = new AudioStreamAnalyser(audioContext, stream);
     37      analyser.enableDebugCanvas();
     38      await analyser.waitForAnalysisSuccess(array => {
     39        // High energy on 1000 Hz low energy around that
     40        const freg_50Hz   = array[analyser.binIndexForFrequency(50)];
     41        const freq        = array[analyser.binIndexForFrequency(TEST_AUDIO_FREQ)];
     42        const freq_2000Hz = array[analyser.binIndexForFrequency(2000)];
     43 
     44        info("Analysing audio frequency - low:target:high = "
     45                + freg_50Hz + ':' + freq + ':' + freq_2000Hz);
     46        return freg_50Hz < 50 && freq > 200 && freq_2000Hz < 50;
     47      });
     48 
     49      // Use the LoopbackTone API to change the frequency of the tone.
     50      // Verify that a tone is detected on the new frequency (800 Hz).
     51      info("Change loopback tone frequency");
     52      tone.changeFrequency(800);
     53      await analyser.waitForAnalysisSuccess(array => {
     54        const freg_50Hz   = array[analyser.binIndexForFrequency(50)];
     55        const freq        = array[analyser.binIndexForFrequency(800)];
     56        const freq_2000Hz = array[analyser.binIndexForFrequency(2000)];
     57 
     58        info("Analysing audio frequency - low:target:high = "
     59                + freg_50Hz + ':' + freq + ':' + freq_2000Hz);
     60        return freg_50Hz < 50 && freq > 200 && freq_2000Hz < 50;
     61      });
     62 
     63      // Create a second tone at a different frequency.
     64      // Verify that both tones are detected.
     65      info("Multiple loopback tones");
     66      tone.changeFrequency(TEST_AUDIO_FREQ);
     67      const second_tone = new LoopbackTone(audioContext, 2000);
     68      second_tone.start();
     69      await analyser.waitForAnalysisSuccess(array => {
     70        const freg_50Hz   = array[analyser.binIndexForFrequency(50)];
     71        const freq        = array[analyser.binIndexForFrequency(TEST_AUDIO_FREQ)];
     72        const freq_2000Hz = array[analyser.binIndexForFrequency(2000)];
     73        const freq_4000Hz = array[analyser.binIndexForFrequency(4000)];
     74 
     75        info("Analysing audio frequency - low:target1:target2:high = "
     76                + freg_50Hz + ':' + freq + ':' + freq_2000Hz + ':' + freq_4000Hz);
     77        return freg_50Hz < 50 && freq > 200 && freq_2000Hz > 200 && freq_4000Hz < 50;
     78      });
     79 
     80      // Stop all tones and verify that there is no audio on the given frequencies.
     81      info("Stop all loopback tones");
     82      tone.stop();
     83      second_tone.stop()
     84      await analyser.waitForAnalysisSuccess(array => {
     85        const freg_50Hz   = array[analyser.binIndexForFrequency(50)];
     86        const freq        = array[analyser.binIndexForFrequency(TEST_AUDIO_FREQ)];
     87        const freq_2000Hz = array[analyser.binIndexForFrequency(2000)];
     88 
     89        info("Analysing audio frequency - low:target:high = "
     90                + freg_50Hz + ':' + freq + ':' + freq_2000Hz);
     91        return freg_50Hz < 50 && freq < 50 && freq_2000Hz < 50;
     92      });
     93    } finally {
     94      for (let t of stream.getTracks()) {
     95        t.stop();
     96      }
     97    }
     98  });
     99 </script>
    100 </pre>
    101 </body>
    102 </html>