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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>
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