LayoutTests/fast/mediastream/getUserMedia-echoCancellation.html

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
promise_test(async test => {
    const stream1 = await navigator.mediaDevices.getUserMedia({ audio: { echoCancellation: false } });
    test.add_cleanup(() => stream1.getTracks().forEach(track => track.stop()));
    assert_false(stream1.getAudioTracks()[0].getSettings().echoCancellation);

    const stream2 = await navigator.mediaDevices.getUserMedia({ audio: true });
    test.add_cleanup(() => stream2.getTracks().forEach(track => track.stop()));
    assert_true(stream2.getAudioTracks()[0].getSettings().echoCancellation);
}, "echoCancellation should be on by default if not explictly disabled");

promise_test(async test => {
    const stream1 = await navigator.mediaDevices.getUserMedia({ audio: { echoCancellation: { exact : false } } });
    test.add_cleanup(() => stream1.getTracks().forEach(track => track.stop()));
    assert_false(stream1.getAudioTracks()[0].getSettings().echoCancellation);
}, "echoCancellation should be off with exact false echoCancellation");

promise_test(async test => {
    const stream0 = await navigator.mediaDevices.getUserMedia({ audio: true });
    test.add_cleanup(() => stream0.getTracks().forEach(track => track.stop()));
    assert_true(stream0.getAudioTracks()[0].getSettings().echoCancellation);
    assert_array_equals(stream0.getAudioTracks()[0].getCapabilities().echoCancellation, [true, false]);

    const devices = await navigator.mediaDevices.enumerateDevices();
    let deviceWithOnlyEchoCancellation, deviceWithoutEchoCancellation;
    for (const device of devices) {
        if (device.label === "Mock audio device 2")
             deviceWithoutEchoCancellation = device;
        else if (device.label === "Mock audio device 3")
             deviceWithOnlyEchoCancellation = device;
    }

    const stream1 = await navigator.mediaDevices.getUserMedia({ audio: { deviceId : deviceWithOnlyEchoCancellation.deviceId } });
    test.add_cleanup(() => stream1.getTracks().forEach(track => track.stop()));
    assert_true(stream1.getAudioTracks()[0].getSettings().echoCancellation);
    assert_array_equals(stream1.getAudioTracks()[0].getCapabilities().echoCancellation, [true]);

    const stream2 = await navigator.mediaDevices.getUserMedia({ audio: { deviceId : deviceWithoutEchoCancellation.deviceId } });
    test.add_cleanup(() => stream2.getTracks().forEach(track => track.stop()));
    assert_false(stream2.getAudioTracks()[0].getSettings().echoCancellation);
    assert_array_equals(stream2.getAudioTracks()[0].getCapabilities().echoCancellation, [false]);
}, "Check capabilities with devices with only echo cancellation or without echo cancellation");

</script>